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Search Results: 1 - 10 of 120159 matches for " Rongping Wang "
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MicroRNA Let-7g and Atherosclerosis Plaque Stabilization  [PDF]
Rongping Yin, Chenlin Zhang, Yunying Hou, Xiaohua Wang
World Journal of Cardiovascular Diseases (WJCD) , 2017, DOI: 10.4236/wjcd.2017.72003
Abstract:
Vascular atherosclerotic vulnerable plaque rupture is the primary cause of acute myocardial infarctions and strokes. Thus, stabilization of vulnerable plaques is of important clinical endeavor to decrease the fatal risk of atherosclerosis. Inflammatory infiltration, apoptosis of endothelial cells (ECs) and vascular smooth muscle cells (VSMCs), destruction of extracellular matrix (ECM) or collagen, and neovascularization all contribute to the formation and stability of plaque. Let-7g, one miRNA of let-7 family, is related to retardation of the progress of vulnerable atherosclerosis plaque. First of all, let-7g induced preservation on vascular diseases through regulating on the intracellular Ca2+- activated protein kinase C-oxLDL-LOX-1 pathway, which resulted in reduced leukocyte adhesion to and migration across endothelium. Over expression of let-7g negatively regulated apoptosis in the ECs by targeting lectin-like oxidized LDL receptor-1(LOX-1)/CASP3 expression, therefore made the fibrous cap of plaque integrated and thick, increased the density of vascular atherosclerotic plaque. In addition, let-7g might stabilize the atherosclerotic plaque through other aspects. In this review, we focus on current and potential importance of let-7g on the stabilization of atherosclerosis plaque which might lead to the future development of an alternative strategy of CAD.
Control Mechanisms and Simulation of Populus simonii Leaf Unfolding  [PDF]
Rongping Li, Ting Wang, Shoujun Sun, Dongming Liu, Qi Zhang
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.58005
Abstract: Populus simonii Carr., one of the main poplar tree species, is cultivated widely in Northeast and Northwest China in protection and timber forests. Plant phenology plays an important role in timber production by controlling the growing period (i.e., the period between the leaf unfolding and the leaf turning yellow). It is important to understand this control mechanism and to improve the accuracy of the simulation of leaf unfolding phenology for P. simonii in order to determine accurately the timber production of P. simonii plantations. In this study, based on phenological observation data from 10 agricultural meteorological stations in Heilongjiang Province, China, model simulation was employed to determine the control mechanism of leaf unfolding of P. simonii. Furthermore, the predicting effects of nine phenology-simulating models for P. simonii leaf unfolding were evaluated and the distribution characteristics of P. simonii leaf unfolding in China in 2015 were simulated. The results show that P. simonii leaf unfolding is sensitive to air temperature; consequently, climate warming could advance the P. simonii leaf unfolding process. The phenological model based on air temperature could be better suited for simulating P. simonii leaf unfolding, with 76.7% of the calibration data of absolute error being less than three days. The performance of the models based solely on forcing requirements was found superior to that of the models incorporating chilling. If it was imperative that the chilling threshold is reached, the south of the Yunnan, Guangdong, and Guangxi provinces would be unsuitable for planting P. simonii. In this regard, the phenology model based on the chilling threshold as necessary condition was indicated a more reasonable model for the distribution characteristics of P. simonii leaf unfolding.
Responses of soil respiration in non-growing seasons to environmental factors in a maize agroecosystem, Northeast China
RongPing Li,GuangSheng Zhou,Yu Wang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3181-9
Abstract: Based on continuous three-year measurements (from 2004 to 2007) of eddy covariance and related environmental factors, environmental controls on variation in soil respiration (R s) during non-growing season were explored in a maize agroecosystem in Northeast China. Our results indicated that during non-growing seasons, daily R s was 1.08–4.08 g CO2 m 2 d 1, and the lowest occurred in late November. The average R s of non-growing season was 456.06 ± 20.01 g CO2 m 2, accounting for 11% of the gross primary production (GPP) of the growing season. Additionally, at monthly scale, the lowest value of R s appeared in January or February. From the beginning to the end of non-growing season, daily R s tended to decrease first, and then increase to the highest. There was a significant quadratic curve relationship between R s and soil temperature at 10 cm depth when soil temperature was more than 0°C (P<0.001), with the explaining ratio of 38%–70%. When soil water content was more than 0.1 m3 m 3, soil moisture at 10 cm depth was significantly parabolically correlated with R s (P<0.001), explaining the rate of 18%–60%. Based on all the data of soil temperature of more than 0°C, a better model for R s was established by coupling soil temperature and moisture, which could explain the rate of up to 53%–79%. Meanwhile, the standard error of regression estimation between the values of prediction and observation for R s could reach 2.7%–11.8%. R s in non-growing season can account for 22.4% of R s in growing season, indicating that it plays a critical role in assessing the carbon budget in maize agroecosystem, Northeast China.
The Utilization of Insect-resources in Chinese Rural Area
Chuanhui YI,Qiuju HE,Lin WANG,Rongping KUANG
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n3p146
Abstract: Human beings'uncontrolled exploitation lead to the rapid consumption and depletion of many natural resources.Mankind is facing an unprecedented dilemma in survival and development which. Searching, development and utilization of new natural resources will be an important way to solve the current problems. Insects, as an important natural resource needing to be further exploited, have aroused wide concerns and may play an important role in tackling food crisis and natural resources depletion. In China, insects have been being utilized for a long time as an important natural resource and there were lots of practices and experiences in the use of insect, especially in the rural regions. In this paper, we presented the current situation of insect utilization in Chinese rural regions and introduced edible insects being used by ethnic people in Yunnan province of China, the place which is special for its diversity in ethnic culture and folkways. In addition, constraints and prospects in using insect resources were discussed and analyzed as well. It was expected that the experiences in using insect resources in China could be helpful for other countries to promote the utilization of insect resources in near future.
Male panda (Ailuropoda melanoleuca) urine contains kinship information
DingZhen Liu,RongPing Wei,GuiQuan Zhang,Hong Yuan,ZhiPeng Wang,Lixing Sun,JianXu Zhang,HeMin Zhang
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0373-7
Abstract: Chemical communication plays an important role in kin selection and mate choice in mammals. The covariance of odor-genes of rodents has been documented and kinship odor has been proposed and termed, yet little is known of the relationship between genetic relatedness and chemical composition of kinship odors. Giant pandas (Ailuropoda melanoleuca) rely substantially on chemical communication to mediate their social interactions. To examine the relationship between genetic relatedness and compounds in the urine/anogenital gland secretions, we compared the similarities between genetic relatedness and the chemical profiles of anogenital gland secretions and urine via lineage construction and GC-MS (gas chromatography and mass spectrometry). We found that information about kinship odors was present only in the urine of male adults in the mating season but absent in the non-mating season. Adult females and all sub-adults did not have such kinship odors in either mating or non-mating season. Therefore, kinship odor in the panda was contingent on age, sex, and season. This is the first report about the condition-dependent expression of kinship odor, which may have a significant implication in the practice of panda conservation in relation to chemical communication and sexual selection.
Sea surface temperature records of core ZY2 from the central mud area in the South Yellow Sea during last 6200 years and related effect of the Yellow Sea Warm Current
LiBo Wang,ZuoSheng Yang,RongPing ZHang,DeJiang Fan,MeiXun Zhao,BangQi Hu
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4442-y
Abstract: Sea surface temperature (SST) records in the South Yellow Sea during the last 6200 years are reconstructed by the unsaturation index of long-chain alkenones (U 37 K′ ) in sediment core ZY2 from the central mud area. The SST records varied between 14.1 and 16.5°C (15.6°C on average), with 3 phases: (1) A high SST phase at 6.2–5.9 cal ka BP; (2) A low and intensely fluctuating SST phase at 5.9–2.3 cal ka BP; and (3) A high and stable SST phase since 2.3 cal ka BP. Variation of the SST records is similar to intensity of the Kuroshio Current (KC), and corresponds well in time to global cold climate events. However, the amplitude of the SST response to cooling events was significantly different in different phases. The SST response to global cooling event was weak while the KC was strong; and the SST response was strong while the KC was weak. The difference in amplitude of the SST response is possibly caused by the modulation effect of the Yellow Sea Warm Current which acts as a shelf branch of the KC and a compensating current induced by the East Asia winter monsoon. The warm waters brought by the Yellow Sea Warm Current cushion the SST decrease induced by climate cooling, and both the Kuroshio and East Asian winter monsoon play important roles in the modulation mechanism. The SST records display a periodicity of 1482 years. The same period was found in the KC records, indicating that variation of the SST records in the central South Yellow Sea is strongly affected by KC intensity. The same period was also found in Greenland ice cores and North Atlantic and Arabian Sea sediment cores, showing a regional response of marine environmental variability in the East China Seas to that in the global oceans.
Cross-modal signaling in giant pandas
Meng Xu,ZhiPeng Wang,DingZhen Liu,RongPing Wei,GuiQuan Zhang,HeMin Zhang,XiaoPing Zhou,DeSheng Li
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-011-4843-y
Abstract: For solitary species that aggregate to breed, signals, such as sound or odor, transmitted across the landscape can play an important role in mate choice and coordinating breeding activity. Recent work on vocalizations of the giant panda (Ailuropoda melanoleuca), bleats and chirps that are emitted during periods of reproductive activity, has revealed that auditory communication in this species is more complicated and developed than once believed. However, playback experiments using these calls have recorded only a few behaviors over short observation times and the influence of these calls on the signaling behavior of receivers remains unknown. Here, we present results from a pilot study in which we played the bleats of male and female giant pandas in estrus to captive animals and measured vocal and chemical signaling response behavior. We found an increase in scent marking behavior, but not vocalizations, in males and females following the playback of calls made by members of the opposite sex in estrus. To our knowledge, this is the first study to detect a chemical communication response, which was marking, to an auditory signal in giant pandas. Our findings reveal a previously unknown relationship between acoustic and chemical signals in this high profile species and suggest that these two forms of signaling may be interdependent in the social lives of giant pandas.
CeO2 thin films grown on biaxially textured nickel (001)
Rongping Wang,Xuming Xiong,Xiangxin Guo,Yueliang Zhou,Huibin Lu,Shaohua Pan,Zhenghao Chen,Guozhen Yang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883972
Abstract: CeO2 films have been grown on biaxially textured Ni substrates at various temperatures. The results show that CeO2 films without IBAD are dominated by (111) orientation from room temperature to 800°C while the preferential orientation of CeO2 films with IBAD is (001) at lower deposition temperature and (111) at deposition temperature higher than 450°C. CeO2 films with better in-plane texture and out-of-plane orientation can be grown at 360°C with 240 eV ion energy and 200 μA/cm2 ion current density.
Do anogenital gland secretions of giant panda code for their sexual ability?
Dingzhen Liu,Hong Yuan,Hong Tian,Rongping Wei,Guiquan Zhang,Lixing Sun,Liwen Wang,Ruyong Sun
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2088-y
Abstract: To test the hypothesis of whether anogenital gland secretions (AGS) of giant panda code for their sexual ability, we collected AGS samples of 11 male (5 adult and 6 subadult) and 14 female (7 adult and 7 subadult) captive giant pandas (Ailuropoda melanoleuca) from China Research and Conservation Center for the Giant Panda at Wolong, Sichuan, China from 1994 to 2002. The samples were analyzed by GC and GC-MS. The GC results showed that male and female pandas shared 20 constituents with equal capacity factors in the AGS. Further GC-MS analyses showed that there were a total of 95 compounds in the AGS. Nine constituents for the males and three for the females differed significantly in relative abundances between sexually active and inactive individuals, but no clear division between sexually active and inactive pandas by hierarchical cluster analyses on the relative abundances of a subset of 56 compounds. However, we were able to separate different age groups of male pandas by the constituents of AGS. 14 compounds were found significantly and negatively, and 8 compounds positively, correlated with pandas’ age by year. Our results suggest that the information contained in the AGS of panda might not code for pandas’ sexual ability but might for their age. These results will be valuable for captive breeding and conservation in the wild.
A New Direct Process to Prepare YBa2Cu3O7-? films on Biaxially Textured Ag{110}<211>
Rongping Wang,Yueliang Zhou,Shaohua Pan,Meng He,Zhenghao Chen,Guozhen Yang
Physics , 1999, DOI: 10.1016/S0921-4534(99)00487-6
Abstract: YBCO films were successfully prepared on biaxially textured Ag{110}<211> substrates by using pulsed laser deposition. X-ray diffraction results showed that the degree of preferential orientation of Ag{110}<211> substrates varied with increasing annealing temperature. With a thin template layer deposited at low temperature, YBCO film with c-axis orientation and in-plane biaxial alignment could be obtained at high deposition temperature. Scanning electron microscopy observation revealed that YBCO grains enlarged but Ag grains on the surface of the YBCO films became smaller with increasing deposition temperature. At optimal deposition conditions, Ag atoms diffuse into the YBCO grain boundaries, and then fill in the weak-link regions in the YBCO film, resulting in the conduction easier. Jc value of 5?105A/cm2 was obtained at 77K and zero magnetic field for the best YBCO film in our work.
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