Digital economy(DE)is on the verge of becoming a pivotal facilitator of the energy transition(ET).However,it remains to be seen to what extent China's outward foreign direct investment(OFDI)can stimulate the devel...Digital economy(DE)is on the verge of becoming a pivotal facilitator of the energy transition(ET).However,it remains to be seen to what extent China's outward foreign direct investment(OFDI)can stimulate the development of the DE and promote ET under the Belt and Road Initiative(BRI).Employing a nonparametric additive model,this study examines this issue by using panel data from 84 BRI countries spanning 2007–2022.The connections between China's OFDI and the DE and ET of BRI nations vary across different regions.China's OFDI has considerably fostered the ET of nations along its route to Central Asia,Europe,North Africa,and the Middle East.Conversely,in the Pacific and East Asian regions,China's OFDI has a constructive effect on the advancement of DE in participating nations.However,the effect of China's OFDI on the ET of nations in the Pacific Islands and East Asia and South Asia is statistically insignificant.Moreover,China's OFDI impairs the DE of nations in Central Asia and Europe,the Caribbean and Latin America,as well as North Africa and the Middle East.Notably,the net effect of China's OFDI on ET is positive;however,the mediating effect of facilitating ET through DE is not pronounced.展开更多
The Chuan-Dian Block(CDB)is located in the southeastern margin of the Tibetan Plateau,with a complex geological structure and active regional faults.The present tectonic condition with strong crustal deformation is cl...The Chuan-Dian Block(CDB)is located in the southeastern margin of the Tibetan Plateau,with a complex geological structure and active regional faults.The present tectonic condition with strong crustal deformation is closely related to the ongoing collision of the India and Eurasia plates since 65 Ma.The study of the crustal structure of this area is key to revealing the evolution and deep geodynamics of the lateral collision zone of the Tibetan Plateau.Deep seismic sounding is the most efficient method with which to unravel the velocity structure of the whole crust.Since the 1980s,19 deep seismic sounding profiles have been captured within the CDB area.In this study,we systematically integrate the research results of the 19 profiles in this area,then image the 3D crustal velocity,by sampling with a 5 km spacing and 2D/3D Kriging interpolation.The results show the following.(1)The Moho depth in the study area deepens from 30 km in the south to 66 km in the north,whereas there is no apparent variation from west to east.The Pn wave velocity is higher in stable tectonic units,such as 7.95 km/s in the Lanping-Simao block and 7.94 km/s in the western margin of the Yangtze block,than in active or mobile tectonic units,such as 7.81 km/s in the Baoshan block,7.72 km/s in the Tengchong block and 7.82 km/s in the Zhongdian block.(2)The crustal nature of the Tengchong block,the northern Lanping-Simao block and the Zhongdian block reflects a type of orogenic belt,having relatively strong tectonic activities,whereas the crustal nature of the central Lanping-Simao block and the western margin of the Yangtze block represents a type of platform.The different features of the upper-middle crust velocity,Moho depth and Pn wave velocity to both sides of the Red River fault zone and the Xianshuihe fault zone,reflect that they are clearly ultra-crustal.(3)Based on the distribution of the low velocity zones in the crust,the crustal material of the Tibetan Plateau is flowing in a NW–SE direction to the north of 26°N and to the west of 101°E,then diverting to flowing eastwards to the east of 101°E.展开更多
Objective Allocryptopine (ALL) is an effective alkaloid of Corydalis decumbens (Thunb.) Pers. Papaveraceae and has proved to be an- ti-arrhythmic. The purpose of our study is to investigate the effects of ALL on t...Objective Allocryptopine (ALL) is an effective alkaloid of Corydalis decumbens (Thunb.) Pers. Papaveraceae and has proved to be an- ti-arrhythmic. The purpose of our study is to investigate the effects of ALL on transmural repolarizing ionic ingredients of outward potassium current (Ito) and slow delayed rectifier potassium current (IKs). Methods The monophasic action potential (MAP) technique was used to record the MAP duration of the epicardium (Epi), myocardium (M) and endocardium (Endo) of the rabbit heart and the whole cell patch clamp was used to recordo and IKs in cardiomyocytes of Epi, M and Endo layers that were isolated from rabbit ventricles. Results The effects of ALL on MAP of Epi, M and Endo layers were disequilibrium. ALL could effectively reduce the transmural dispersion of repolarization (TDR) in rabbit transmural ventricular wall. ALL decreased the current densities ofo and IKs in a voltage and concentration dependent way and narrowed the repolarizing differences among three layers. The analysis of gating kinetics showed ALL accelerated the channel activation ofIto in M layers and partly inhibit the channel openings ofo in Epi, M and Endo cells. On the other hand, ALL mainly slowed channel deactivation of IKs channel in Epi and Endo layers without affecting its activation. Conclusions Our study gives partially explanation about the mechanisms of tmnsmural inhibition ofo and IKs channels by ALL in rabbit myocardium. These findings provide novel perspective regarding the anti-arrhythmogenesis application of ALL in clinical settings.展开更多
Acutely isolated mouse hippocampal CA3 pyramidal neurons were exposed to 3 mT static magnetic field,and the characteristics of transient outward K+ channel were studied using the whole-cell patch-clamp technique.The e...Acutely isolated mouse hippocampal CA3 pyramidal neurons were exposed to 3 mT static magnetic field,and the characteristics of transient outward K+ channel were studied using the whole-cell patch-clamp technique.The experiment revealed that the amplitude of transient outward potassium channel current was reduced.The maximum activated current densities of control group and exposure group were 163.62±20.68 pA/pF and 98.74±16.57 pA/pF(n=12,P0.05) and the slope factor of the inactivation curves from 8.69±0.80 mV to 10.87±1.02 mV(n=12,P<0.05) .The results show that the static magnetic field can change the characteristics of transient outward K+ channel,and affect the physiological functions of neurons.展开更多
The need to balance economic growth and its environmental impact continues to be a serious issue in China.As environmental regulation in China increases in importance,it is critical to understand how it impacts econom...The need to balance economic growth and its environmental impact continues to be a serious issue in China.As environmental regulation in China increases in importance,it is critical to understand how it impacts economic growth drivers such as outward foreign direct investment(OFDI)to formulate effective policies.One consideration should be the hidden economy,which can weaken the effects of environmental regulation on OFDI.This study investigates the scale of the hidden economy in 30 provinces and province-level municipalities in China in the period 2004 to 2015.The study uses the multiple indicators and multiple causes(MIMIC)model and the systematic generalized method of moments(GMM)test to analyze the impact of environmental regulation and the hidden economy on China's OFDI.The results show that stronger environmental regulation promotes OFDI.However,the hidden economy inhibits China's OFDI,as the positive effects of environmental regulation that drive OFDI are distorted.From a regional perspective,stronger environmental regulation promotes OFDI as well,while the hidden economy inhibits it.The interaction between environmental regulation and the hidden economy also inhibits it significantly.展开更多
The transmural heterogeneous changes of transient outward potassium currents (Ito) in rabbit hypertrophic cardiaomyocytes and the effects of long-term prophylactic treatment with volsartan were investigated. Rabbits w...The transmural heterogeneous changes of transient outward potassium currents (Ito) in rabbit hypertrophic cardiaomyocytes and the effects of long-term prophylactic treatment with volsartan were investigated. Rabbits were divided into hypertrophy group (left ventricular hypertrophy induced by partial ligation of abdominal aorta), vol-treated group (volsartan was administrated after the ligation), and control group (sham operated). Myocytes were isolated by a two-step enzymatical method. The sub-endocardial (Endo) and sub-epicardium (Epi) tissues were separated from midmyocardium (Mid) with a razor. Whole-cell patch-clamp technique was used to record potassium currents. The results showed that membrane capacitance was larger in hypertrophic cells than those in control and vol-treated cells (P<0.01 vs control cells, n=30). The densities of Ito in hypertrophic cells were reduced by sub-epicardium (Epi) (27.8±2.9) %, midmyocardium (Mid) (41.0±4.7) %, and sub-endocardium (Endo) (20.3±3.4) % compared with those in control cells. The decrease of Ito density was more pronounced in Mid than in Epi and Endo (P<0.01 vs Epi or Endo). There were no significant differences in Ito densities between vol-treated group and control group in three layers separately. In conclusion, volsartan can inhibit the transmural heterogeneous changes of Ito in left ventricular hypertrophic cardiomyocytes in rabbit.展开更多
BACKGROUND: The neuronal transient outward potassium channel has been shown to be highly associated with acetylcholine. However, the influence of acetylcholine on the transient outward potassium current in cerebral c...BACKGROUND: The neuronal transient outward potassium channel has been shown to be highly associated with acetylcholine. However, the influence of acetylcholine on the transient outward potassium current in cerebral cortical neurons remains poorly understood. OBJECTIVE: To investigate acetylcholine modulation on transient outward potassium current in rat parietal cortical neurons using the whole-cell patch-clamp technique. DESIGN, TIME AND SETTING: A neuroelectrophysiology study was performed at the Department of Physiology, Harbin Medical University between January 2005 and January 2006. MATERIALS: Wistar rats were provided by the Animal Research Center, the Second Hospital of Harbin Medical University; PC-IIC patch-clamp amplifier and IBBClamp data collection analysis system were provided by Huazhong University for Science and Technology, Wuhan, China; PP-83 microelectrode puller was purchased from Narrishage, Japan. METHODS: The parietal somatosensory cortical neurons were acutely dissociated, and the modulation of acetylcholine (0.1, 1, 10, 100 μmol/L) on transient outward potassium channel was recorded using the whole-cell patch-clamp technique. MAIN OUTCOME MEASURES: Influence of acetylcholine on transient outward potassium current, potassium channel activation, and inactivation. RESULTS: The inhibitory effect of acetylcholine on transient outward potassium current was dose- and voltage-dependent (P 〈 0.01). Acetylcholine was found to significantly affect the activation process of transient outward potassium current, i.e., the activation curve of transient outward potassium current was left-shifted, while the inactivation curve was shifted to hyperpolarization. Acetylcholine significantly prolonged the time constant of recovery from inactivation of transient outward potassium current (P 〈 0.01). CONCLUSION: These results suggest that acetylcholine inhibits transient outward potassium current by regulating activation and inactivation processes of the transient outward potassium channel.展开更多
The implementation of China’s open development strategy has unveiled a wave of outward foreign direct investment(OFDI)by Chinese companies,with global implications.Based on panel data from 146 developing countries fr...The implementation of China’s open development strategy has unveiled a wave of outward foreign direct investment(OFDI)by Chinese companies,with global implications.Based on panel data from 146 developing countries from 2003 to 2017,we investigate the growth effects of China’s OFDI.We find that China’s OFDI has promoted significant economic growth in developing countries.Not only could China’s OFDI increase GDP per capita of a country in a short time but raise the country’s long-run equilibrium value as well.In addition,the growth effects of China’s OFDI were more significant for countries with weak governance,rich resource,and modest human capital,and were above the average level for Belt and Road Initiative(BRI)countries,African countries,and in the post-crisis era.Our research helps unravel the global significance of Chinese companies investing overseas and contributes to research on the growth effects of direct investment between developing countries.展开更多
We used RNA interference(RNAi)to disrupt synthesis of the cortical neuronal y-aminobutyric acid A receptor(GABAAR)al in rats during development,and measured outward K+currents during neuronal electrical activity using...We used RNA interference(RNAi)to disrupt synthesis of the cortical neuronal y-aminobutyric acid A receptor(GABAAR)al in rats during development,and measured outward K+currents during neuronal electrical activity using whole-cell patch-clamp techniques.Three pairs of small interfering RNA(siRNA)for GABAAR al subunit were designed using OligoEngine RNAi software.This siRNA was found to effectively inhibited GABAAR al mRNA expression in cortical neuronal culture in vitro,but did not significantly affect neuronal survival.Outward K^currents were decreased,indicating that GABAAR al subunits in developing neurons participate in neuronal function by regulating outward K+current.展开更多
The electrophysiological properties of potassium ion channels are regarded as a basic index for determining the functional differentiation of neural stem cells. In this study, neural stem cells from the hippocampus of...The electrophysiological properties of potassium ion channels are regarded as a basic index for determining the functional differentiation of neural stem cells. In this study, neural stem cells from the hippocampus of newborn rats were induced to differentiate with neurotrophic growth factor, and the electrophysiological properties of the voltage-gated potassium ion channels were observed. Immunofluorescence staining showed that the rapidly proliferating neural stem cells formed spheres in vitro that expressed high levels of nestin. The differentiated neurons were shown to express neuron-specific enolase. Flow cytometric analysis revealed that the neural stem cells were actively dividing and the percentage of cells in the S + G2/M phase was high. However, the ratio of cells in the S + G2/M phase decreased obviously as differentiation proceeded. Whole-cell patch-clamp re- cordings revealed apparent changes in potassium ion currents as the neurons differentiated. The potassium ion currents consisted of one transient outward potassium ion current and one delayed rectifier potassium ion current, which were blocked by 4-aminopyridine and tetraethylammonium, respectively. The experimental findings indicate that neural stem cells from newborn rat hippo- campus could be cultured and induced to differentiate into functional neurons under defined condi- tions in vitro. The differentiated neurons expressed two types of outward potassium ion cur'ents similar to those of mature neurons in vivo.展开更多
This paper presents an empirical study of how U.S. antidumping (AD) actions against China affect China 's inward and outward foreign direct investment (FDI) based on the international division of labor model. Our...This paper presents an empirical study of how U.S. antidumping (AD) actions against China affect China 's inward and outward foreign direct investment (FDI) based on the international division of labor model. Our findings are as follows: (1) The U.S.-China trade deficit has been widened by both downstream firms in China established through vertical FDI and also inward enterprises established through horizontal FDI. The widening deficit in turn exacerbates vitriolic complaints in the U.S. about injury to its industries. This will lead to further U.S. AD actions discouraging FDI in China. (2) U.S. AD cases against China have negatively impacted China's metal manufacturing, chemical and, especially, textile industries in terms of exports and inward FDI. From 2004 to 2009, the share of total inward FDI going to China's manufacturing sector has dropped drastically by almost 20 percent. This supports predictions made using the international division of labor model. (3) With U.S. AD actions against Chinese products on the rise, Chinese firms chose not to circumvent such barriers through outward FDI in the U.S. but rather through outward FDI in tax havens. Such a pattern of outward FDI is not helpful for China to establish its own successful industrial development model.展开更多
In the context of economic globalization and increasingly tight resource and environmental constraints,the environmental effect of open economy has been highly concerned by the academic community.With the implementati...In the context of economic globalization and increasingly tight resource and environmental constraints,the environmental effect of open economy has been highly concerned by the academic community.With the implementation of the“Going Global”campaign and the“Belt and Road Initiative”,China’s OFDI has been expanding.What is the impact of the rapid growth of OFDI on the home environment?How can China improve the quality and level of OFDI in order to promote domestic green development under the dual context of constructing a new dual circulation development pattern and advocating green development?These questions deserve further discussion.Most of the existing literature focuses on the empirical interpretation of OFDI’s home country environmental effect by using linear models,while few involve nonlinear models.The literature on the important role of financial development in home country and the threshold effect of OFDI on home country environment is even less common.In view of this,based on the mechanism of argumentation and propositional inference,this paper calculated the environmental pollution index of 30 provinces in China from 2003 to 2017 by using China’s provincial panel data of these years and selecting industrial waste water,industrial waste gas,industrial SO2,and industrial soot emissions and industrial solid waste production amount index.Then,this paper empirically studied China's OFDI home environment of financial development threshold effect by constructing financial development as the threshold variables panel threshold model.The results showed that:①China’s OFDI had a significant impact on the environment of the home country,based on the level of financial development of the home country.When China’s financial development level was lower than the first threshold value,China’s OFDI had a significant restraining effect on environmental pollution in the home country.When China’s financial development level crossed the first threshold value but did not exceed the second threshold value,China’s OFDI significantly enhanced its inhibiting effect on environmental pollution in its home country.When China’s financial development level was higher than the second threshold value,the inhibiting effect of China’s OFDI on environmental pollution in the home country was further enhanced.②In the sample period,the financial development level of most provinces in China was not high.Only a few provinces with high financial development level had a strong inhibiting effect on environmental pollution in their home country,and the provinces with a high degree of coupling and coordination between OFDI and financial development tended to have a low level of environmental pollution.Accordingly,this paper proposes to optimize the financial service environment of OFDI,improve the green technology content of OFDI,and strengthen the original innovation and re-innovation ability of green technology.展开更多
The present study seeks to address two fundamental questions.(1)Does outward foreign direct investment(OFDI)enhance enterprise performance ultimately?(2)How does this effect come about?A new dataset from the years 201...The present study seeks to address two fundamental questions.(1)Does outward foreign direct investment(OFDI)enhance enterprise performance ultimately?(2)How does this effect come about?A new dataset from the years 2011 to 2016 based on the micro-data of 88 Chinese multinational-listed enterprises was used to test research hypotheses with the mediating effect modeling approach.The study results reveal that:(1)the investment intensity has a positive influence,while investment span has a negative influence on enterprise performance;(2)the enhanced innovation capability can considerably increase the enterprise performance,while investment intensity and span both hinder the upgrading of innovation capability;and(3)the innovation capability of an enterprise plays a partial intermediary role among investment span and enterprise performance.However,there is no mediating effect between investment intensity,innovation ability,and enterprise performance.展开更多
Outward oriented economy in Fujian Province has been developed rapidly since the implementation of open door policy. Regional differentiation is obvious between ethnic Chinese hometown and non ethnic Chinese one; sout...Outward oriented economy in Fujian Province has been developed rapidly since the implementation of open door policy. Regional differentiation is obvious between ethnic Chinese hometown and non ethnic Chinese one; southeast Fujian and other part of the province; and different counties within southeast Fujian. Enterprises with foreign capital make great contribution to the economic development of Fujian.展开更多
Objective:To observe the sustained expression of transient outward potassium channel related proteins at the end of the treatment and 30 days after the end of the treatment in rats,and to explore the sustained curativ...Objective:To observe the sustained expression of transient outward potassium channel related proteins at the end of the treatment and 30 days after the end of the treatment in rats,and to explore the sustained curative effect and mechanism of acupuncture combined with Xijingtongmai decoction in rats with myocardial infarction.Methods:Twenty of 130 male SD rats were random extracted as the control group,and the rest were used to establish myocardial infarction by fed with high-fat diet and then injected with isoproterenol.According to ECG,80 rats were successfully established.Then they were randomly divided into model group,acupuncture combined with Chinese medicine group,acupuncture group and Western medicine group.The content of bFGF protein was measured by ELISA.The protein contents of Kv1.4,Kv4.2,Kv4.3 and KChIP2 were measured by Western blot.Results:At the end of treatment,compared with the model group,the protein contents of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF in each treatment group increased,and the increase was most significant in the acupuncture combined with Chinese medicine group(P<0.05).At the end of treatment,compared with the model group,the protein contents of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF in each treatment group increased,and the increase was most significant in the acupuncture combined with Chinese medicine group(P<0.05).Compared with the treatment group at the end of treatment,the expression of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF protein in each treatment group 30 days after the end of treatment decreased slightly(P<0.05),but still higher than that of the model group at this time(P<0.05).The combination of acupuncture and Chinese medicine group decreased the least of them(P<0.05).Conclusion:The results showed that acupuncture combined with xijingtongmai decoction had a sustained good effect.Its sustained action mechanism may be achieved by continuously increasing the protein content of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF through transient outward potassium channel.展开更多
Traditional foreign direct investment (FDI) theory only examines corporate investment motivation while neglectinggovernment roles.China’s outward direct investment (ODI) is of both commercial and strategic significan...Traditional foreign direct investment (FDI) theory only examines corporate investment motivation while neglectinggovernment roles.China’s outward direct investment (ODI) is of both commercial and strategic significance to leveragedomestic and international resources and markets.ODI is a corporate behavior but also is a means of achieving nationalstrategies and heightening political and economic statuses.As a source of ODI,China should provide strong guidance andbacking to corporate ODI for both commercial and national interests.展开更多
With the further development of economic globalization since the establishment of ties between China and the Association of Southeast Asian Nations(ASEAN) 30 years ago and the continuous increase in the scale of inter...With the further development of economic globalization since the establishment of ties between China and the Association of Southeast Asian Nations(ASEAN) 30 years ago and the continuous increase in the scale of international students in China,the training of international talents has become an important approach to avoiding the risks of transnational investments.We established panel data by selecting variables from the period 2006 to 2017,including the scale of international students coming from ASEAN to China,the gross amount of China’s outward foreign direct investment(OFDI),and the GDP per capita of ASEAN countries to further explore the correlations among these variables.We applied a panel-vector autoregressive(PVAR) model to conducting a Granger causality test,a Gaussian mixture model(GMM) regression analysis,a Monte Carlo-based impulse response analysis,and variance decomposition of the data.The results show that the growth of OFDI exerted an obvious positive impact on the inflow of international students from the countries along the Belt and Road(B&R) within a short period,the growth of the scale of international students coming from these countries to study in China had a strong positive effect on OFDI,the training of international talents was conducive to promoting the scale of transnational investments,but the overall quality was not very high,and its economic contribution rate was low.It is also found that OFDI and the scale of international students from the countries along the B&R promoted the GDP growth to a certain extent and the positive accumulation effect fluctuated due to external factors.Therefore,it is suggested to expanding the scale of OFDI and improving China’s core competitiveness in international student education.Intensive management of investment factors should also be conducted along with sound development of training mechanisms for international talents.展开更多
Rural wterprise plays a more and more important role in the development of outward economy of China. In 1994, 44.5 percent of the export value was produced by rural enterprises. This paper will focus on the rural ente...Rural wterprise plays a more and more important role in the development of outward economy of China. In 1994, 44.5 percent of the export value was produced by rural enterprises. This paper will focus on the rural enterprises with export, their growth, structural change and regional distribution. 'San Lai Yi Bu' as a special form of outward enterprises, the foreign investment in rural enterprises the regional distribution and development tendency of rtral aterprises with foreign investment will be studied at the same time. The factor analysis will be used to study the evolution of the role that rural enterprises played in the development of outward economy, the regional difference in the development level and industrial structure of rural enterprises of outward economy.展开更多
基金support provided by the National Social Science Foundation of China(Grant No.20BJY076).
摘要Digital economy(DE)is on the verge of becoming a pivotal facilitator of the energy transition(ET).However,it remains to be seen to what extent China's outward foreign direct investment(OFDI)can stimulate the development of the DE and promote ET under the Belt and Road Initiative(BRI).Employing a nonparametric additive model,this study examines this issue by using panel data from 84 BRI countries spanning 2007–2022.The connections between China's OFDI and the DE and ET of BRI nations vary across different regions.China's OFDI has considerably fostered the ET of nations along its route to Central Asia,Europe,North Africa,and the Middle East.Conversely,in the Pacific and East Asian regions,China's OFDI has a constructive effect on the advancement of DE in participating nations.However,the effect of China's OFDI on the ET of nations in the Pacific Islands and East Asia and South Asia is statistically insignificant.Moreover,China's OFDI impairs the DE of nations in Central Asia and Europe,the Caribbean and Latin America,as well as North Africa and the Middle East.Notably,the net effect of China's OFDI on ET is positive;however,the mediating effect of facilitating ET through DE is not pronounced.
基金funded by grants from the National Key R&D Program of China(Grant No.2016YFC0600302)the National Natural Science Foundation of China(Grant Nos.41774114,42274134 and 41590863)the Chinese Geological Survey Project(Grant Nos.DD20179342 and DD20190011).
摘要The Chuan-Dian Block(CDB)is located in the southeastern margin of the Tibetan Plateau,with a complex geological structure and active regional faults.The present tectonic condition with strong crustal deformation is closely related to the ongoing collision of the India and Eurasia plates since 65 Ma.The study of the crustal structure of this area is key to revealing the evolution and deep geodynamics of the lateral collision zone of the Tibetan Plateau.Deep seismic sounding is the most efficient method with which to unravel the velocity structure of the whole crust.Since the 1980s,19 deep seismic sounding profiles have been captured within the CDB area.In this study,we systematically integrate the research results of the 19 profiles in this area,then image the 3D crustal velocity,by sampling with a 5 km spacing and 2D/3D Kriging interpolation.The results show the following.(1)The Moho depth in the study area deepens from 30 km in the south to 66 km in the north,whereas there is no apparent variation from west to east.The Pn wave velocity is higher in stable tectonic units,such as 7.95 km/s in the Lanping-Simao block and 7.94 km/s in the western margin of the Yangtze block,than in active or mobile tectonic units,such as 7.81 km/s in the Baoshan block,7.72 km/s in the Tengchong block and 7.82 km/s in the Zhongdian block.(2)The crustal nature of the Tengchong block,the northern Lanping-Simao block and the Zhongdian block reflects a type of orogenic belt,having relatively strong tectonic activities,whereas the crustal nature of the central Lanping-Simao block and the western margin of the Yangtze block represents a type of platform.The different features of the upper-middle crust velocity,Moho depth and Pn wave velocity to both sides of the Red River fault zone and the Xianshuihe fault zone,reflect that they are clearly ultra-crustal.(3)Based on the distribution of the low velocity zones in the crust,the crustal material of the Tibetan Plateau is flowing in a NW–SE direction to the north of 26°N and to the west of 101°E,then diverting to flowing eastwards to the east of 101°E.
摘要Objective Allocryptopine (ALL) is an effective alkaloid of Corydalis decumbens (Thunb.) Pers. Papaveraceae and has proved to be an- ti-arrhythmic. The purpose of our study is to investigate the effects of ALL on transmural repolarizing ionic ingredients of outward potassium current (Ito) and slow delayed rectifier potassium current (IKs). Methods The monophasic action potential (MAP) technique was used to record the MAP duration of the epicardium (Epi), myocardium (M) and endocardium (Endo) of the rabbit heart and the whole cell patch clamp was used to recordo and IKs in cardiomyocytes of Epi, M and Endo layers that were isolated from rabbit ventricles. Results The effects of ALL on MAP of Epi, M and Endo layers were disequilibrium. ALL could effectively reduce the transmural dispersion of repolarization (TDR) in rabbit transmural ventricular wall. ALL decreased the current densities ofo and IKs in a voltage and concentration dependent way and narrowed the repolarizing differences among three layers. The analysis of gating kinetics showed ALL accelerated the channel activation ofIto in M layers and partly inhibit the channel openings ofo in Epi, M and Endo cells. On the other hand, ALL mainly slowed channel deactivation of IKs channel in Epi and Endo layers without affecting its activation. Conclusions Our study gives partially explanation about the mechanisms of tmnsmural inhibition ofo and IKs channels by ALL in rabbit myocardium. These findings provide novel perspective regarding the anti-arrhythmogenesis application of ALL in clinical settings.
基金Supported by National Natural Science Foundation of China(No. 60674111)
摘要Acutely isolated mouse hippocampal CA3 pyramidal neurons were exposed to 3 mT static magnetic field,and the characteristics of transient outward K+ channel were studied using the whole-cell patch-clamp technique.The experiment revealed that the amplitude of transient outward potassium channel current was reduced.The maximum activated current densities of control group and exposure group were 163.62±20.68 pA/pF and 98.74±16.57 pA/pF(n=12,P0.05) and the slope factor of the inactivation curves from 8.69±0.80 mV to 10.87±1.02 mV(n=12,P<0.05) .The results show that the static magnetic field can change the characteristics of transient outward K+ channel,and affect the physiological functions of neurons.
基金supported by the Humanities and Social Sciences Foundation of the Chinese Ministry of Education[Grant Number.20YJC790031].
摘要The need to balance economic growth and its environmental impact continues to be a serious issue in China.As environmental regulation in China increases in importance,it is critical to understand how it impacts economic growth drivers such as outward foreign direct investment(OFDI)to formulate effective policies.One consideration should be the hidden economy,which can weaken the effects of environmental regulation on OFDI.This study investigates the scale of the hidden economy in 30 provinces and province-level municipalities in China in the period 2004 to 2015.The study uses the multiple indicators and multiple causes(MIMIC)model and the systematic generalized method of moments(GMM)test to analyze the impact of environmental regulation and the hidden economy on China's OFDI.The results show that stronger environmental regulation promotes OFDI.However,the hidden economy inhibits China's OFDI,as the positive effects of environmental regulation that drive OFDI are distorted.From a regional perspective,stronger environmental regulation promotes OFDI as well,while the hidden economy inhibits it.The interaction between environmental regulation and the hidden economy also inhibits it significantly.
摘要The transmural heterogeneous changes of transient outward potassium currents (Ito) in rabbit hypertrophic cardiaomyocytes and the effects of long-term prophylactic treatment with volsartan were investigated. Rabbits were divided into hypertrophy group (left ventricular hypertrophy induced by partial ligation of abdominal aorta), vol-treated group (volsartan was administrated after the ligation), and control group (sham operated). Myocytes were isolated by a two-step enzymatical method. The sub-endocardial (Endo) and sub-epicardium (Epi) tissues were separated from midmyocardium (Mid) with a razor. Whole-cell patch-clamp technique was used to record potassium currents. The results showed that membrane capacitance was larger in hypertrophic cells than those in control and vol-treated cells (P<0.01 vs control cells, n=30). The densities of Ito in hypertrophic cells were reduced by sub-epicardium (Epi) (27.8±2.9) %, midmyocardium (Mid) (41.0±4.7) %, and sub-endocardium (Endo) (20.3±3.4) % compared with those in control cells. The decrease of Ito density was more pronounced in Mid than in Epi and Endo (P<0.01 vs Epi or Endo). There were no significant differences in Ito densities between vol-treated group and control group in three layers separately. In conclusion, volsartan can inhibit the transmural heterogeneous changes of Ito in left ventricular hypertrophic cardiomyocytes in rabbit.
基金Special Foundation for the Science and Technology Youth of Heilongjiang Province,No. QC07C95the Science and Technology Foundation Program of Heilongjiang Provincial Education Department,No.11531152the Postdoctoral Foundation of Heilongjiang Province,No. LRB 07-424
摘要BACKGROUND: The neuronal transient outward potassium channel has been shown to be highly associated with acetylcholine. However, the influence of acetylcholine on the transient outward potassium current in cerebral cortical neurons remains poorly understood. OBJECTIVE: To investigate acetylcholine modulation on transient outward potassium current in rat parietal cortical neurons using the whole-cell patch-clamp technique. DESIGN, TIME AND SETTING: A neuroelectrophysiology study was performed at the Department of Physiology, Harbin Medical University between January 2005 and January 2006. MATERIALS: Wistar rats were provided by the Animal Research Center, the Second Hospital of Harbin Medical University; PC-IIC patch-clamp amplifier and IBBClamp data collection analysis system were provided by Huazhong University for Science and Technology, Wuhan, China; PP-83 microelectrode puller was purchased from Narrishage, Japan. METHODS: The parietal somatosensory cortical neurons were acutely dissociated, and the modulation of acetylcholine (0.1, 1, 10, 100 μmol/L) on transient outward potassium channel was recorded using the whole-cell patch-clamp technique. MAIN OUTCOME MEASURES: Influence of acetylcholine on transient outward potassium current, potassium channel activation, and inactivation. RESULTS: The inhibitory effect of acetylcholine on transient outward potassium current was dose- and voltage-dependent (P 〈 0.01). Acetylcholine was found to significantly affect the activation process of transient outward potassium current, i.e., the activation curve of transient outward potassium current was left-shifted, while the inactivation curve was shifted to hyperpolarization. Acetylcholine significantly prolonged the time constant of recovery from inactivation of transient outward potassium current (P 〈 0.01). CONCLUSION: These results suggest that acetylcholine inhibits transient outward potassium current by regulating activation and inactivation processes of the transient outward potassium channel.
基金Key research project of the Shanghai Municipal Education Commission(Grant No.2017-01-07-00-02-E00008).
摘要The implementation of China’s open development strategy has unveiled a wave of outward foreign direct investment(OFDI)by Chinese companies,with global implications.Based on panel data from 146 developing countries from 2003 to 2017,we investigate the growth effects of China’s OFDI.We find that China’s OFDI has promoted significant economic growth in developing countries.Not only could China’s OFDI increase GDP per capita of a country in a short time but raise the country’s long-run equilibrium value as well.In addition,the growth effects of China’s OFDI were more significant for countries with weak governance,rich resource,and modest human capital,and were above the average level for Belt and Road Initiative(BRI)countries,African countries,and in the post-crisis era.Our research helps unravel the global significance of Chinese companies investing overseas and contributes to research on the growth effects of direct investment between developing countries.
基金the National Natural Science Foundation for Youth,No.30400483
摘要We used RNA interference(RNAi)to disrupt synthesis of the cortical neuronal y-aminobutyric acid A receptor(GABAAR)al in rats during development,and measured outward K+currents during neuronal electrical activity using whole-cell patch-clamp techniques.Three pairs of small interfering RNA(siRNA)for GABAAR al subunit were designed using OligoEngine RNAi software.This siRNA was found to effectively inhibited GABAAR al mRNA expression in cortical neuronal culture in vitro,but did not significantly affect neuronal survival.Outward K^currents were decreased,indicating that GABAAR al subunits in developing neurons participate in neuronal function by regulating outward K+current.
基金supported by the National Natural Science Foundation of China,No.31000514the Scientific Research Project for Talent with High Education of Xinxiang Medical University,No.2007502002
摘要The electrophysiological properties of potassium ion channels are regarded as a basic index for determining the functional differentiation of neural stem cells. In this study, neural stem cells from the hippocampus of newborn rats were induced to differentiate with neurotrophic growth factor, and the electrophysiological properties of the voltage-gated potassium ion channels were observed. Immunofluorescence staining showed that the rapidly proliferating neural stem cells formed spheres in vitro that expressed high levels of nestin. The differentiated neurons were shown to express neuron-specific enolase. Flow cytometric analysis revealed that the neural stem cells were actively dividing and the percentage of cells in the S + G2/M phase was high. However, the ratio of cells in the S + G2/M phase decreased obviously as differentiation proceeded. Whole-cell patch-clamp re- cordings revealed apparent changes in potassium ion currents as the neurons differentiated. The potassium ion currents consisted of one transient outward potassium ion current and one delayed rectifier potassium ion current, which were blocked by 4-aminopyridine and tetraethylammonium, respectively. The experimental findings indicate that neural stem cells from newborn rat hippo- campus could be cultured and induced to differentiate into functional neurons under defined condi- tions in vitro. The differentiated neurons expressed two types of outward potassium ion cur'ents similar to those of mature neurons in vivo.
基金This paper is sponsored by the Chinese National Social Science Foundation Project (grant llBJY142), Chinese MOE Project of Key Research Institute of Humanities and Social Sciences at Universities (grant 08JJD790138), Shanghai Pujiang Program Project (grant 2011C), Shu Guang Project of Shanghai Educational Development Foundation (grant llSGl0) and 985'Third Period Project of Fudan University (grant 2011SHKXZD002).
摘要This paper presents an empirical study of how U.S. antidumping (AD) actions against China affect China 's inward and outward foreign direct investment (FDI) based on the international division of labor model. Our findings are as follows: (1) The U.S.-China trade deficit has been widened by both downstream firms in China established through vertical FDI and also inward enterprises established through horizontal FDI. The widening deficit in turn exacerbates vitriolic complaints in the U.S. about injury to its industries. This will lead to further U.S. AD actions discouraging FDI in China. (2) U.S. AD cases against China have negatively impacted China's metal manufacturing, chemical and, especially, textile industries in terms of exports and inward FDI. From 2004 to 2009, the share of total inward FDI going to China's manufacturing sector has dropped drastically by almost 20 percent. This supports predictions made using the international division of labor model. (3) With U.S. AD actions against Chinese products on the rise, Chinese firms chose not to circumvent such barriers through outward FDI in the U.S. but rather through outward FDI in tax havens. Such a pattern of outward FDI is not helpful for China to establish its own successful industrial development model.
摘要In the context of economic globalization and increasingly tight resource and environmental constraints,the environmental effect of open economy has been highly concerned by the academic community.With the implementation of the“Going Global”campaign and the“Belt and Road Initiative”,China’s OFDI has been expanding.What is the impact of the rapid growth of OFDI on the home environment?How can China improve the quality and level of OFDI in order to promote domestic green development under the dual context of constructing a new dual circulation development pattern and advocating green development?These questions deserve further discussion.Most of the existing literature focuses on the empirical interpretation of OFDI’s home country environmental effect by using linear models,while few involve nonlinear models.The literature on the important role of financial development in home country and the threshold effect of OFDI on home country environment is even less common.In view of this,based on the mechanism of argumentation and propositional inference,this paper calculated the environmental pollution index of 30 provinces in China from 2003 to 2017 by using China’s provincial panel data of these years and selecting industrial waste water,industrial waste gas,industrial SO2,and industrial soot emissions and industrial solid waste production amount index.Then,this paper empirically studied China's OFDI home environment of financial development threshold effect by constructing financial development as the threshold variables panel threshold model.The results showed that:①China’s OFDI had a significant impact on the environment of the home country,based on the level of financial development of the home country.When China’s financial development level was lower than the first threshold value,China’s OFDI had a significant restraining effect on environmental pollution in the home country.When China’s financial development level crossed the first threshold value but did not exceed the second threshold value,China’s OFDI significantly enhanced its inhibiting effect on environmental pollution in its home country.When China’s financial development level was higher than the second threshold value,the inhibiting effect of China’s OFDI on environmental pollution in the home country was further enhanced.②In the sample period,the financial development level of most provinces in China was not high.Only a few provinces with high financial development level had a strong inhibiting effect on environmental pollution in their home country,and the provinces with a high degree of coupling and coordination between OFDI and financial development tended to have a low level of environmental pollution.Accordingly,this paper proposes to optimize the financial service environment of OFDI,improve the green technology content of OFDI,and strengthen the original innovation and re-innovation ability of green technology.
基金National Natural Science Foundation of China(No.71572032)Fundamental Research Funds for the Central Universities,China(No.2017405)
摘要The present study seeks to address two fundamental questions.(1)Does outward foreign direct investment(OFDI)enhance enterprise performance ultimately?(2)How does this effect come about?A new dataset from the years 2011 to 2016 based on the micro-data of 88 Chinese multinational-listed enterprises was used to test research hypotheses with the mediating effect modeling approach.The study results reveal that:(1)the investment intensity has a positive influence,while investment span has a negative influence on enterprise performance;(2)the enhanced innovation capability can considerably increase the enterprise performance,while investment intensity and span both hinder the upgrading of innovation capability;and(3)the innovation capability of an enterprise plays a partial intermediary role among investment span and enterprise performance.However,there is no mediating effect between investment intensity,innovation ability,and enterprise performance.
摘要Outward oriented economy in Fujian Province has been developed rapidly since the implementation of open door policy. Regional differentiation is obvious between ethnic Chinese hometown and non ethnic Chinese one; southeast Fujian and other part of the province; and different counties within southeast Fujian. Enterprises with foreign capital make great contribution to the economic development of Fujian.
基金Key project of Liaoning provincial science and technology foundation(No.20180530079)。
摘要Objective:To observe the sustained expression of transient outward potassium channel related proteins at the end of the treatment and 30 days after the end of the treatment in rats,and to explore the sustained curative effect and mechanism of acupuncture combined with Xijingtongmai decoction in rats with myocardial infarction.Methods:Twenty of 130 male SD rats were random extracted as the control group,and the rest were used to establish myocardial infarction by fed with high-fat diet and then injected with isoproterenol.According to ECG,80 rats were successfully established.Then they were randomly divided into model group,acupuncture combined with Chinese medicine group,acupuncture group and Western medicine group.The content of bFGF protein was measured by ELISA.The protein contents of Kv1.4,Kv4.2,Kv4.3 and KChIP2 were measured by Western blot.Results:At the end of treatment,compared with the model group,the protein contents of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF in each treatment group increased,and the increase was most significant in the acupuncture combined with Chinese medicine group(P<0.05).At the end of treatment,compared with the model group,the protein contents of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF in each treatment group increased,and the increase was most significant in the acupuncture combined with Chinese medicine group(P<0.05).Compared with the treatment group at the end of treatment,the expression of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF protein in each treatment group 30 days after the end of treatment decreased slightly(P<0.05),but still higher than that of the model group at this time(P<0.05).The combination of acupuncture and Chinese medicine group decreased the least of them(P<0.05).Conclusion:The results showed that acupuncture combined with xijingtongmai decoction had a sustained good effect.Its sustained action mechanism may be achieved by continuously increasing the protein content of Kv1.4,Kv4.2,Kv4.3,KChIP2 and bFGF through transient outward potassium channel.
摘要Traditional foreign direct investment (FDI) theory only examines corporate investment motivation while neglectinggovernment roles.China’s outward direct investment (ODI) is of both commercial and strategic significance to leveragedomestic and international resources and markets.ODI is a corporate behavior but also is a means of achieving nationalstrategies and heightening political and economic statuses.As a source of ODI,China should provide strong guidance andbacking to corporate ODI for both commercial and national interests.
基金National Social Science“Measurement and Evaluation on the Performance of Education Policies for Targeted Poverty Alleviation of Severely Impoverished Areas”(71864032)“A Study on Imbalance and Optimization of Preferential Policies for Higher Education of Minorities in Xinjiang”(71663044)。
摘要With the further development of economic globalization since the establishment of ties between China and the Association of Southeast Asian Nations(ASEAN) 30 years ago and the continuous increase in the scale of international students in China,the training of international talents has become an important approach to avoiding the risks of transnational investments.We established panel data by selecting variables from the period 2006 to 2017,including the scale of international students coming from ASEAN to China,the gross amount of China’s outward foreign direct investment(OFDI),and the GDP per capita of ASEAN countries to further explore the correlations among these variables.We applied a panel-vector autoregressive(PVAR) model to conducting a Granger causality test,a Gaussian mixture model(GMM) regression analysis,a Monte Carlo-based impulse response analysis,and variance decomposition of the data.The results show that the growth of OFDI exerted an obvious positive impact on the inflow of international students from the countries along the Belt and Road(B&R) within a short period,the growth of the scale of international students coming from these countries to study in China had a strong positive effect on OFDI,the training of international talents was conducive to promoting the scale of transnational investments,but the overall quality was not very high,and its economic contribution rate was low.It is also found that OFDI and the scale of international students from the countries along the B&R promoted the GDP growth to a certain extent and the positive accumulation effect fluctuated due to external factors.Therefore,it is suggested to expanding the scale of OFDI and improving China’s core competitiveness in international student education.Intensive management of investment factors should also be conducted along with sound development of training mechanisms for international talents.
摘要Rural wterprise plays a more and more important role in the development of outward economy of China. In 1994, 44.5 percent of the export value was produced by rural enterprises. This paper will focus on the rural enterprises with export, their growth, structural change and regional distribution. 'San Lai Yi Bu' as a special form of outward enterprises, the foreign investment in rural enterprises the regional distribution and development tendency of rtral aterprises with foreign investment will be studied at the same time. The factor analysis will be used to study the evolution of the role that rural enterprises played in the development of outward economy, the regional difference in the development level and industrial structure of rural enterprises of outward economy.