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Association of single nucleotide polymorphism of vitamin D receptor gene start codon and the suscepbility to prostate cancer in Han nationality in Hubei, China 被引量:2
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作者 YiYang Shao-GangWang Zhang-QunYe Wei-MinYang 《Asian Journal of Andrology》 SCIE CAS CSCD 2004年第3期248-248,共1页
Aim: To investigate the single nucleotide polymorphism of vitamin D receptor (VDR) gene start codon in the Han nationality in Hubei and its relationship to the susceptibility to prostate cancel (PCa). Methods: The VDR... Aim: To investigate the single nucleotide polymorphism of vitamin D receptor (VDR) gene start codon in the Han nationality in Hubei and its relationship to the susceptibility to prostate cancel (PCa). Methods: The VDR genotypes were determined by poly-merase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 80 patients with PCa and 96 normal male controls from the Han nationality in Hubei, using endonuclease Fok. Direct sequencing was done in part of the PCR products. Results: The frequency distribution of Fok I alleles in this cohort all followed the Hardy-Weinberg equilibrium. The distribution of genotypes and alleles had no significant difference between PCa patients and the controls (P>0.05). Conclusion: There was no significant relationship between Fok I polymorphism of VDR gene start codon and PCa in the Han nationality in Hubei. 展开更多
关键词 prostate cancer vitamin D receptor gene start codon single nucleotide polymorphism han nationality
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Study on the Relationship between 5-HttLPR Gene and BDNF Gene Polymorphism and Post-Traumatic Stress Disorder in Li and Han Nationality of Hainan Province
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作者 Haiyan Lin Juncheng Guo +1 位作者 Min Guo Xiangling Jiang 《Health》 2022年第1期158-175,共18页
<strong>Objective:</strong> To investigate the correlation between 5-HTTLPR (5-and serotonin transporter linked polymer region) gene polymorphism and BDNF (brain derived neural factor) gene polymorphism an... <strong>Objective:</strong> To investigate the correlation between 5-HTTLPR (5-and serotonin transporter linked polymer region) gene polymorphism and BDNF (brain derived neural factor) gene polymorphism and PTSD (post traumatic stress disorders) in Li and Han nationalities in Hainan Province. <strong>Methods:</strong> 167 Hainan Li PTSD patients, 141 Hainan Han PTSD patients and 158 healthy volunteers (control group) were investigated by ETI, caps, Toh, WCST, TMT and WAIS-RC. The polymorphisms of rs6265 locus of 5-HTTLPR and BDNF genes were detected by PCR (polymerase chain reaction) and page (polycylamide gel electrophoresis), and the correlation with PTSD was analyzed. Logistic regression analysis was used to analyze the influencing factors of PTSD. <strong>Results:</strong> The ETI score, total PTSD score and TMT time of Li PTSD patients were significantly higher than those of Han PTSD patients (P < 0.01). The comprehension, picture filling, picture arrangement, operation IQ and total IQ of WAIS-RC were significantly lower than those of Han PTSD patients (P < 0.01);The numbers of errors, TMT and Toh in WCST were significantly lower than those in Han PTSD patients (P < 0.01). There was no significant difference in the distribution of 5-HTTLPR genotype and allele between Li PTSD patients and control group (P > 0.05). SS genotype of 5-HTTLPR and (GA + AA) genotype of rs6265 locus may increase the risk of PTSD in Hainan Han population. AA and GA + AA genotypes at rs6265 locus may increase the risk of PTSD in Li population (P < 0.05). Among Li PTSD patients, the ETI score, PTSD total score, TMT time, Toh planning time and execution time of AA genotype at rs6265 locus were significantly higher than those of GG genotype;the total scores of comprehension and operation IQ, and Toh in WAIS-RC were significantly lower than those in GG genotype (P < 0.05). Among Han PTSD patients, the ETI score, PTSD total score and TMT time of SS genotype of 5-HTTLPR were significantly higher than those of LL genotype, and the comprehension, arithmetic and block diagram in WAIS-RC were significantly lower than those of LL genotype;The ETI score, PTSD total score and TMT time of patients with (GA + AA) genotype at rs6265 locus were also significantly higher than those of patients with GG genotype. The comprehension and block diagram in WAIS-RC were significantly lower than those of patients with GG genotype. The number of WCST errors in patients with AA genotype was significantly higher than those of patients with GG genotype, and the operational IQ in WAIS-RC was significantly lower than those of patients with GG genotype (P < 0.05). <strong>Conclusion:</strong> The LL genotype of 5-HTTLPR and the GG genotype of rs6265 locus are related to PTSD of Li and Han nationalities in Hainan, which are important protective factors for PTSD of Li and Han nationalities in Hainan. 展开更多
关键词 5-HTTLPR BDNF Gene Polymorphism Post-Traumatic Stress Disorder Li nationality han nationality Frequency Distribution
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Exploring the Forest Cover Changes and Influential Factors of Dongsithouane National Production Forest Area, Savannakhet Province, Lao PDR
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作者 Souvanthone Douangphachachanh Chittana Phompila +5 位作者 Dipjoy Chakma Inta Chanthavong Maliphone Douangphachanh Puvadol Doydee Pengxiang Zhao Yuanchun Yu 《Journal of Data Analysis and Information Processing》 2024年第3期432-461,共30页
The Dongsithouane National Production Forest (DNPF) is one of the largest natural forest areas in Savannakhet, Lao PDR, which has been a vital support for the local community’s livelihood, Recently, significant chang... The Dongsithouane National Production Forest (DNPF) is one of the largest natural forest areas in Savannakhet, Lao PDR, which has been a vital support for the local community’s livelihood, Recently, significant changes in land use and land cover (LULC) have been observed in this area, leading to a reduction of natural forests. There were two separate methods of this study: firstly, to identify LULC changes across three different periods, spectral imagery from the Landsat 5 Thematic Mapper (TM) for the years 2001 and 2011, and the Landsat 8 Operational Land Imager (OLI) for 2021 were used as the primary data sources. The satellite images were preprocessed for various forest classes, including pretreatment of the top of atmosphere reflectance by using QGIS software’s semi-automatic classification plug-in (SCP), and ArcGIS was used for post-classification. A supervised classification approach was applied to the satellite images from 2001, 2011, and 2021 to generate diverse maps of LULC. Secondly, a household survey dataset was used to investigate influential factors. Approximately 220 households were interviewed in order to collect socio-economic information (including data on population growth, increased business activities, location of the area, agriculture land expansion, and need for settlement land). Household survey data was analyzed by using SPSS. Descriptive statistics, including frequency distributions and percentages, were applied to observe characteristics. Additionally, a binary logistic regression model was used to analyze the socioeconomic factors related to LULC change in DNPF. Key findings indicated a decline in natural forest areas within the study site. Specifically, both dry dipterocarp forest (−11.35%) and mixed deciduous forest (−0.18%) decreased from 2001 to 2021. The overall accuracy of the LULC maps was 94%, 86%, and 89% for the years 2001, 2011, and 2021 respectively. In contrast, agricultural land increased significantly by 155.70%, while built-up land, and water bodies increased by 65.54% and 35.33%, respectively. The results also highlighted a significant increase in construction land, up to 65.54%. Furthermore, the study found a correlation between agricultural expansion and a reduction of forest areas, along with an increase in built-up land along the forest areas’ boundaries. Timber exploitation and charcoal production also contributed to the decline in forest cover. The logistic regression model identified significant determinants of LULC change, including the area’s location, agricultural land expansion, increased business activity, and the need for settlement land. These factors have influenced the management of DNPF. Urgent sustainable management practices and actions, including forest ecosystem protection, village agricultural zoning, water source and watershed protection and public awareness, are required to preserve the forest areas of DNPF. 展开更多
关键词 Land Use/Land Cover Change QGIS SCP Socioeconomic Factor Dongsithouane National Production Forest Lao PDR
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Research on the Deep Integration Mechanism of National Fitness Campaign and College Physical Education Teaching:Taking Guangdong University of Science and Technology as an Example
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作者 Junmei Cui Yanqing Yan 《Journal of Contemporary Educational Research》 2024年第1期107-115,共9页
By using the methods of literature review,questionnaire survey,and expert interview,this paper discusses and analyzes the deep integration mechanism of national fitness campaign and college physical education teaching... By using the methods of literature review,questionnaire survey,and expert interview,this paper discusses and analyzes the deep integration mechanism of national fitness campaign and college physical education teaching,in order to promote the development of college physical education teaching reform,expand ideas,explore new fields,and provide novel development directions.The purpose is to enhance the national physical quality,improve the public service system,enhance the health awareness of the citizens,and provide guidelines for promoting the development of sports. 展开更多
关键词 National fitness campaign College physical education Deep integration Mechanism
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Research on the Ecological Wisdom of Traditional Dwellings of the Liangshan Yi Nationality Based on Regional Climate
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作者 Qin Lai Wei Liu Xing Li 《Journal of Building Construction and Planning Research》 2023年第2期50-68,共19页
As a typical building with ethnic and regional characteristics in southwest Chi-na, its construction skills contain rich local ecological wisdom. The detailed analysis of the climatic and geomorphological features of ... As a typical building with ethnic and regional characteristics in southwest Chi-na, its construction skills contain rich local ecological wisdom. The detailed analysis of the climatic and geomorphological features of the Liangshan Yi nationality area shows that the thermal mass effect is the first choice for the passive adjustment strategy of residential dwellings. This study focuses on the typical representatives of traditional dwellings in Meigu County, analyzing the wisdom of ecological construction to improve the thermal mass effects of res-idential buildings at the macro (village), moderate (courtyard), and micro (building unit) levels. Based on this analysis, the study summarizes the “genetic factor library” of the ecological construction mode of traditional Yi residential dwellings. Finally, the measured data of the residential thermal environment and the simulation data of Ecotect software are used to study and judge the logic behind its ecological construction wisdom. The results show that the tradi-tional dwellings of the Yi nationality in Liangshan have six aspects of local en-vironmental knowledge to improve the thermal mass effects performance of buildings. The winter thermal environment of the house is comfortable, and the heat is sufficient;Rammed earth materials in residential buildings have more potent, powerful, and robust thermal mass effects performance than stone slabs and wooden boards. 展开更多
关键词 Climate Adaptability Liangshan Yi nationality Traditional Dwelling Ecological Intelligence
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On Chinese-English Translation of Disease and Syndrome Terms in Shang Han Lun from the Perspective of Functional Equivalence Theory
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作者 喻惠芳 倪天鸣 《海外英语》 2015年第19期148-149,155,共3页
Shang Han Lun is one of the most famous and important traditional medical books in China,so many translation versions of it have emerged.Based on the comparison of examples taken from two of these translation versions... Shang Han Lun is one of the most famous and important traditional medical books in China,so many translation versions of it have emerged.Based on the comparison of examples taken from two of these translation versions,Young Jie De ' s Shang Han Lun Explained and Huang Hai s Introduction to Treatise on Exogenous Febrile Disease,the paper points out that Nida s Functional Equivalence Theory provides a new idea for the translation of Disease and Syndrome Terms in TCM that literal translation,liberal translation and transliteration can be adopted appropriately to make readers of translation versions understand TCM accurately and easily. 展开更多
关键词 translation DISEASE and SYNDROME TERM Shang han Lun Functional EQUIVALENCE
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Association between Serum Ferritin Levels and Metabolic-associated Fatty Liver Disease in Adults:a Cross-sectional Study Based on the NHANES
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作者 Jiang-hui LI Xue-yao MA +3 位作者 Yun YI Lu-rao LI Zhi-yong XU Ying CHANG 《Current Medical Science》 SCIE CAS 2024年第3期494-502,共9页
Objective Ferritin,initially acting as an iron-storage protein,was found to be associated with metabolic diseases.Our study was designed to investigate the association between serum ferritin and metabolic-associated f... Objective Ferritin,initially acting as an iron-storage protein,was found to be associated with metabolic diseases.Our study was designed to investigate the association between serum ferritin and metabolic-associated fatty liver disease(MAFLD)using data from the National Health and Nutrition Examination Survey(NHANES)of the United State of America.Methods A cross-sectional study was conducted,enrolling a total of 2145 participants from the NHANES in the 2017–2018 cycles.Hepatic steatosis and liver fibrosis were assessed by ultrasound images and several non-invasive indexes.Multiple regression analysis was conducted to determine the associations between serum ferritin concentration and MAFLD and liver fibrosis.Results The analysis revealed that participants with higher serum ferritin levels(Q3 and Q4 groups)had a higher prevalence of MAFLD than those with the lowest serum ferritin levels[Q3 vs.Q1:OR=2.17(1.33,3.53),P<0.05 in fatty liver index(FLI);Q4 vs.Q1:OR=3.13(1.91,5.13),P<0.05 in FLI].Additionally,participants with the highest serum ferritin levels(Q4 group)displayed a higher prevalence of liver fibrosis[Q4 vs.Q1:OR=2.59(1.19,5.62),P<0.05 in liver stiffness measurement;OR=5.06(1.12,22.94),P<0.05 in fibrosis-4 index],with significantly increased risk observed in participants with concomitant diabetes[OR=7.45(1.55,35.72),P=0.012].Conclusion Our study revealed that elevated serum ferritin levels are associated with a higher prevalence of MAFLD and advanced liver fibrosis in patients.Elevated serum ferritin levels combined with diabetes are important risk factors for liver fibrosis. 展开更多
关键词 serum ferritin liver fibrosis metabolic-associated fatty liver disease National Health and Nutrition Examination Survey
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Exploring the Reasons for Changes in National Reading Behaviour from the Perspective of Media Environmentalism
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作者 JIN Yong-cheng ZHANG Ke-xin 《Journal of Literature and Art Studies》 2024年第6期443-449,共7页
In this paper, through the perspective of Merowitz’s media environmentalism, following the research path of media-scene-behaviour, and based on the results of the national reading survey released by the China Press a... In this paper, through the perspective of Merowitz’s media environmentalism, following the research path of media-scene-behaviour, and based on the results of the national reading survey released by the China Press and Publication Research Institute in the past ten years (2013-2022), we analyse the characteristics of national reading behaviours, explore the reasons for the changes in national reading behaviour in terms of technology, media, and scenarios. It also discusses the future trend of national reading behaviour and the promotion of national reading activities, and puts forward certain countermeasures from the government, schools and the society to make joint efforts to promote national reading. 展开更多
关键词 media convergence media environmentalism national reading behaviour
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The basic core traditional C hinese medicine for the prevention and treatment of COVID-19 and its active mechanisms
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作者 Zhe Xu Zi-Xin Li +3 位作者 Zi-Yao Geng Rong-Li Shu Hui-Fang Zhou Yu-Hong Bian 《Pharmacology Discovery》 2024年第1期21-30,共10页
Background:COVID-19 has had a dramatic impact on human health,economies,societies,and livelihoods around the world.Traditional Chinese medicine(TCM)formulae have played an important role in the prevention and treatmen... Background:COVID-19 has had a dramatic impact on human health,economies,societies,and livelihoods around the world.Traditional Chinese medicine(TCM)formulae have played an important role in the prevention and treatment of COVID-19.WHO evaluated the role of TCM in treating of COVID-19 and encouraged other countries to promote the use of TCM formulae.However,the key is to find the basic core traditional Chinese medicine(BC-TCM)among those formulae.Methods:For the first time,we mined the data of TCM formulae in CNIPA and analyzed herb characteristics and association rules.We then determined the BC-TCM and screened main compounds and therapeutic targets.Finally,the potential molecular mechanisms were explored by using enrichment analyses and molecular docking.Results:This study screened 123 patented TCM formulae,including 312 herbs.According to frequency statistics and association rules,nine herbs(Gan Cao,Jin Yinhua,Guang Huoxiang,Fu Ling,Huang Qi,Jie Geng,Lian Qiao,Cang Zhu,Ku Xingren)were selected as the BC-TCM.The BC-TCM involved 166 main compounds and 48 therapeutic targets.The active compounds Hederagenin,Spinasterol,Beta-sitosterol,and Liquiritin had high binding activity to the COVID-19 targets 3CL,ACE2,and core targets RELA,HSP90AA1,STAT3,MAPK3,and TP53 according to molecular docking results.Interestingly,Hederagenin might be a potential compound for the prevention and treatment of COVID-19.Conclusion:Our research predicted and confirmed the preventive therapeutic effect of BC-TCM on COVID-19.This has the potential to broaden the scope of TCM,guide people in using clinical formulae,and provide valuable insights for future TCM discovery research. 展开更多
关键词 COVID-19 traditional Chinese medicine China national intellectual property administration data mining network pharmacology
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The 2 ℃ Global Temperature Target and the Evolution of the Long-TermGoal of Addressing Climate Change-From the United Nations FrameworkConvention on Climate Change to the Paris Agreement 被引量:24
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作者 Yun Gao Xiang Gao Xiaohua Zhang 《Engineering》 SCIE EI 2017年第2期272-278,共7页
The Paris Agreement proposed to keep the increase in global average temperature to well below 2 ℃ abovepre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 ℃ above pre-industriallevel... The Paris Agreement proposed to keep the increase in global average temperature to well below 2 ℃ abovepre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 ℃ above pre-industriallevels. It was thus the first international treaty to endow the 2 ℃ global temperature target with legal effect.The qualitative expression of the ultimate objective in Article 2 of the United Nations Framework Conventionon Climate Change (UNFCCC) has now evolved into the numerical temperature rise target in Article 2 of theParis Agreement. Starting with the Second Assessment Report (SAR) of the Intergovernmental Panel on Cli-mate Change (IPCC), an important task for subsequent assessments has been to provide scientific informa-tion to help determine the quantified long-term goal for UNFCCC negotiation. However, due to involvementin the value judgment within the scope of non-scientific assessment, the IPCC has never scientifically af-firmed the unacceptable extent of global temperature rise. The setting of the long-term goal for addressingclimate change has been a long process, and the 2 ℃ global temperature target is the political consensuson the basis of scientific assessment. This article analyzes the evolution of the long-term global goal foraddressing climate change and its impact on scientific assessment, negotiation processes, and global low-carbon development, from aspects of the origin of the target, the series of assessments carried out by the 1PCCfocusing on Article 2 of the UNFCCC, and the promotion of the global temperature goal at the political level. 展开更多
关键词 CLIMATE ChanGE International negotiationln tergovernmental Panel on CLIMATE ChanGE UNITED Nations Framework CONVENTION on CLIMATE ChangeLong-term GOAL Critical vulnerability Intuitive building
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Serum Esterase Polymorphisms and Their Associations with Prolificacy in Small Tail Han Sheep
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作者 杨慈清 李小英 《Animal Husbandry and Feed Science》 CAS 2009年第1期9-11,共3页
[ Objective] The aim of this research was to provide a theoretical basis for the.breeding and identification of multiparous Small Tail Han sheep. [ Method] The polymorphisms of serum esterase (Es) locus in Small Tai... [ Objective] The aim of this research was to provide a theoretical basis for the.breeding and identification of multiparous Small Tail Han sheep. [ Method] The polymorphisms of serum esterase (Es) locus in Small Tail Han sheep were detected by vertical discontinuous polyacrylamide gel electrophoresis (PAGE). According to the statistical analysis of different genotypes and their litter size, the correlation between Es polymor- phisms and litter size was analyzed. [ Result] There were three genotypes in Es locus, and Es^+- was the dominate genotype. The differences of ewe litter size in the 1 ,t parity among these three genotypes were nonsignificant ( P 〉 0.05), As far as the 2^nd and 3rd parity was considered, the litter size of genotype Es++ was significantly (P〈0.05) higher than that of Es-- and Es^+- ; the average litter size of Es++ was extremely significant ( P 〈 0.01 ) higher than that of Es - - and Es + - while there was no significant difference ( P 〉 0.05) between the latter two. [ Conclusion] The Es lo- cus could be regarded as a genetic marker locus for early selection of high-yielding ewes and Es ++ is the high-yielding genotype of Small Tail Han sheep. 展开更多
关键词 Small Tailed han sheep Serum esterase POLYMORPHISM PROLIFICACY
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The ideal landscape and its ecological planning approach in Mount Lushan National Park,China
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作者 徐聪荣 胡海胜 +2 位作者 吴章文 郑艳萍 钟林生 《Journal of Forestry Research》 SCIE CAS CSCD 2009年第A3期279-284,288,共7页
This paper described the main four basic models of ideal landscape in the Mount Lushan National Park as Kunlunshan model, Xumishan model, Peach flower land model, Christian model. Five typical places in Mount Lushan w... This paper described the main four basic models of ideal landscape in the Mount Lushan National Park as Kunlunshan model, Xumishan model, Peach flower land model, Christian model. Five typical places in Mount Lushan with the ideal landscape characteristics like the East Grove Temple, White Deer Cave Academy, Simplicity and Tranquility Monastery, Lushan Valley, and Villa-cluster of the East Valley were analyzed, and the integration of the basic models for each place was discussed to make the realistic landscape conform to the ideal needs. Moreover, the discussions also involved the characteristics of ideal landscape that are featured in resource, culture, structure, function, process, scale and region. In conclusion, ideal landscape in the Mount Lushan National Park was the product of the interaction between human and nature. Mount Lushan inherits the essence of Chinese traditional culture with a history of more than 1000 years; and it also absorbs the manna of the Western culture as well as the exchanges between nature and humanities together with the conflict and adaptation among different cultures. The natural landscape could be satisfied with the survival demand and cultural taste of mankind by the way of ecological planning. 展开更多
关键词 ecological planning ideal landscape landscape model Mount Lushan National Park
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Analysis on the characteristics of Yi nationality herbal single experience prescription in wuliangshan district
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作者 Jing Xiao Chao Zhang Cheng-Li Sun 《TMR Theory and Hypothesis》 2018年第4期117-122,共6页
Yi nationality medicine is an important part of traditional Chinese medicine. It has both the connotation of traditional Chinese medicine and distinct national and medicinal characteristics. Many of the single experie... Yi nationality medicine is an important part of traditional Chinese medicine. It has both the connotation of traditional Chinese medicine and distinct national and medicinal characteristics. Many of the single experience prescriptions circulated among the Yi people in Wuliangshan areas originate from the classics. They attach importance to diet therapy, medication according to local sources, flexible treatment, remarkable curative effect, and unique medication bath method for women during childbirth and Han (Xian) jiao therapy in Beginning of Summer, which deserve our attention. 展开更多
关键词 Yi nationality Single empirical prescription Folk experience prescription Medicated bath during childbirth
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The association of handgrip strength with prevalence of hypertension among Chinese Han population
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作者 Manthar Ali Mallah Min Liu +5 位作者 Yu Liu Haifeng Xu Xiaojun Wu Xiaotian Chen Hui Wang Chong Shen 《中国循环杂志》 CSCD 北大核心 2018年第S01期118-118,共1页
Objective To investigate the associations of handgrip strength with hypertension among Chinese Han population.Methods A total of 11, 151 subjects were recruited between October to November in 2015, using a multi-stage... Objective To investigate the associations of handgrip strength with hypertension among Chinese Han population.Methods A total of 11, 151 subjects were recruited between October to November in 2015, using a multi-stage sampling method in 13 townships of Jurong city, Jiangsu Province, south of China. 展开更多
关键词 hanDGRIP strength HYPERTENSION Chinese han POPULATION
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Brief History of Xu-style Gardens in the Qin and Han Dynasties
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作者 YAN Hua LIU Xiaolu QIN Fei 《Journal of Landscape Research》 2021年第1期2-6,共5页
This paper studied the gardening activities and characteristics of Xu-style gardens in the Qin and Han Dynasties by combining ancient literature with the study of Han Dynasty stone reliefs.The results showed that by Q... This paper studied the gardening activities and characteristics of Xu-style gardens in the Qin and Han Dynasties by combining ancient literature with the study of Han Dynasty stone reliefs.The results showed that by Qin and Han Dynasties,the imperial(royal)gardens and private gardens in ancient Xuzhou had developed in parallel.Imperial(royal)gardens were built by or for vassal kings,First Emperor of Qin Dynasty,Emperor Gaozu of Han Dynasty Liu Bang,for example,Pei Palace,Yanqi Tai,Xima Tai,Hanzu Temple,Lingguang Palace of Lu and so on.As for private gardens,stone reliefs in medium or small tombs owned by the bigwigs or the rich were collected from ancient Xuzhou,and from which we can see clearly the development of private garden from the court,the yard to the garden,rich garden plants and animal species,garden architecture types such as hall,building,pavilion,platform,boat,corridor,gate,gatetower,ornamental column etc.,particularly,hanging waterside pavilion was a unique architectural form of Xu-style garden.These achievements showed that Xu-style garden architecture had been transformed from the pre-Qin incubation period to the generation period. 展开更多
关键词 Landscape architecture Qin and han Dynasties Royal garden Private garden han Dynasty stone reliefs
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HAN基单组元推进剂热分解过程的分子动力学模拟
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作者 黄永民 李旭博 +1 位作者 胡旭 周秀爽 《火箭推进》 CAS 北大核心 2024年第5期106-113,共8页
为揭示非催化点火方式的硝酸羟胺(HAN)基单组元液体火箭发动机内推进剂的反应机理,采用分子动力学模拟方法,在ReaxFF/lg力场下对HAN基推进剂热分解机理及配方影响作用机制开展研究。计算结果表明:推进剂热分解过程存在两个阶段。第一个... 为揭示非催化点火方式的硝酸羟胺(HAN)基单组元液体火箭发动机内推进剂的反应机理,采用分子动力学模拟方法,在ReaxFF/lg力场下对HAN基推进剂热分解机理及配方影响作用机制开展研究。计算结果表明:推进剂热分解过程存在两个阶段。第一个阶段为吸热阶段,推进剂内硝酸羟胺和硝酸肼氢键断裂,分解生成羟胺、肼和硝酸,吸热阶段主要受推进剂内氢键个数影响;第二个阶段为推进剂分解反应阶段,由硝酸和羟胺的分解所引发,生成NH_(2)、NO_(2)和OH。OH为主要的氧化性物质,与肼、甲醇反应,生成大量的水。肼在推进剂中的分解主要依靠与OH反应脱氢,生成N_(2)H_(3),并最终分解形成N_(2)和H_(2)。推进剂配方仅对与OH的反应有显著影响。降低甲醇的含量,能够显著提升燃料的反应速率,同时促进肼分子的反应脱氢,提高推进剂初始分解速率;提高硝酸羟胺的含量能够促进甲醇的分解,但受肼分解反应速率较低的影响,推进剂整体分解速率降低。 展开更多
关键词 单组元液体火箭发动机 han基推进剂 分子动力学模拟 ReaxFF/lg 热分解
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Xu-style Garden Architecture of the Han Dynasty: Hanging Waterside Pavilion
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作者 YAN Hua WANG Meiqing 《Journal of Landscape Research》 2021年第1期19-22,共4页
Based on the Han Dynasty stone reliefs unearthed in the ancient Xuzhou area,a kind of pavilion above the water—hanging waterside pavilion(Xuan Shui Xie,built above the water with stilts and brackets as the base and s... Based on the Han Dynasty stone reliefs unearthed in the ancient Xuzhou area,a kind of pavilion above the water—hanging waterside pavilion(Xuan Shui Xie,built above the water with stilts and brackets as the base and seeming hanging on the water)was systematically collected and classifi ed into 2 major categories:single-bracket column hanging waterside pavilion and multiple-bracket column hanging waterside pavilion.The research showed that hanging waterside pavilion got ride of traditional pavilion’s reliance on rammed earth foundation.In addition to working as a connection part,brackets,or bucket arches(Dougong)had also tremendous load-bearing capacity,straight and curved brackets co-formed a giant multiple bracket system,staircases and one-side hanging structure were used to support the upper construction,so that a new towering but light wooden structure hanging above the water was created,which was an innovation of bracket technique of the Han Dynasty,and also a creative design in the development of wooden architecture. 展开更多
关键词 Landscape architecture han Dynasty stone reliefs Xu-Style garden architecture hanging waterside pavilion
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Association of Gghrelin Polymorphisms with Metabolic Syndrome in Han Nationality Chinese 被引量:4
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作者 LING-LING XU HONG-DING XIANG +1 位作者 CHANG-CHUN QIU QUN XU 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2008年第3期188-192,共5页
Objective To investigate the association of ghrelin gene polymorphisms with metabolic syndrome in Han Nationality Chinese. Methods A total of 240 patients with metabolic syndrome and 427 adults aged above forty years ... Objective To investigate the association of ghrelin gene polymorphisms with metabolic syndrome in Han Nationality Chinese. Methods A total of 240 patients with metabolic syndrome and 427 adults aged above forty years were recruited. Genotypes were determined by polymerase chain reaction and restriction fragment length polymorphism analysis. Results The allelic frequency of the Leu72Met polymorphism was 17.3% in the patient group and 11.9% in the control group (x^2=7.36, P=0.007). Metabolic syndrome was more prevalent among carriers of the Met72 variant (43.8 vs 33.1%, age- and sex-adjusted odds ratio=1.57, P=0.01). No Arg51Gln variants were found in our study subjects. Conclusion Rather than being associated with its individual components, Leu72Met polymorphism is associated with metabolic syndrome in the Han Nationality Chinese. Arg51Gln polymorphism is rare in the Han Nationality Chinese. 展开更多
关键词 GHRELIN POLYMORPHISM Metabolic syndrome the han nationality
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Relationship between the -455G/A and -148C/T polymorphisms in the beta-fibrinogen gene and cerebral infarction in the Xinjiang Uygur and Han Chinese populations 被引量:13
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作者 Xiaoning Zhang Yanyun Li +2 位作者 Xuebing Guo Lei Du Jianhua Ma 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第7期546-551,共6页
We sought to investigate the correlation between the -455G/A and -148C/T polymorphisms of the β-fibrinogen gene and plasma fibrinogen levels in patients with cerebral infarction and in healthy subjects among the Xinj... We sought to investigate the correlation between the -455G/A and -148C/T polymorphisms of the β-fibrinogen gene and plasma fibrinogen levels in patients with cerebral infarction and in healthy subjects among the Xinjiang Uygur and Han Chinese populations, by using polymerase chain reaction-restriction enzyme digestion analysis. Results showed that there were no statistically significant differences in the distributions of the -455G/A genotype and allele frequency between the Uygurs and the Han. Plasma fibrinogen levels in cerebral infarction patients among the Uygurs and the Han were higher than those among healthy subjects. In particular, the frequencies of the -455G/A AA and -148C/T TT genotypes were significantly higher than in healthy subjects. Individuals carrying the A or T allele had a higher incidence of cerebral infarction compared with those carrying the G or C allele. Our experimental findings indicate that the -148C/T and -455G/A polymorphisms are associated with cerebral infarction in Xinjiang Uygur and Han Chinese subjects. The susceptibility- conferring alleles are -148T and -455A, and the susceptibility-conferring genotype is -455G/A + AA. 展开更多
关键词 UYGUR han cerebral infarction β-fibrinogen gene polymorphism neural regeneration
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E670G polymorphism of PCSK9 gene of patients with coronary heart disease among Han population in Hainan and three provinces in the northeast of China 被引量:10
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作者 Xi-Min He Lin Chen +3 位作者 Tian-Song Wang Yun-Bo Zhang Jiang-Bin Luo Xu-Xia Feng 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2016年第2期169-174,共6页
Objective: To investigate the correlation between E670 G polymorphism of proprotein convertase subtilisin/kexin type 9(PCSK9) gene and coronary heart disease(CHD), and contrastively study the regional differences of E... Objective: To investigate the correlation between E670 G polymorphism of proprotein convertase subtilisin/kexin type 9(PCSK9) gene and coronary heart disease(CHD), and contrastively study the regional differences of E670 G polymorphism of PCSK9 gene between patients with CHD among the Han population in Hainan and three provinces in the northeast of China(TPNC), providing scientific basis for prevention and treatment of patients with CHD in different regions. Methods: A total of 233 cases of patients with CHD were selected from the Han population in Hainan and TPNC as the experimental group(118 cases from Hainan, 115 cases from TPNC), and 239 cases with non-CHD were selected among the Han population also in the two regions as control group(125 cases from Hainan, 114 cases from TPNC). The triglyceride(TG), total cholesterol(TC), high density lipoprotein cholesterol and low density lipoprotein cholesterol(LDL-C) levels of plasma were tested and PCR-RFLP method was used to test the E670 G polymorphism of PCSK9 gene. The statistical software package SPSS 21.0 was used for the statistical analysis and P<0.05 was considered as statistically significant. Results: The levels of systolic pressure, diastolic blood pressure, fasting blood sugar, TC, TG, and LDL-C of patients in CHD group were significantly higher than those in non-CHD group, while the high density lipoprotein cholesterol level was lower than that in non-CHD group(P<0.05). In CHD group, the frequencies of AG, GG genotypes of PCSK9 gene and G allele were higher than those in non-CHD group(P<0.05), and in CHD group, the frequencies of AG, GG genotypes and G allele of patients both in Hainan and TPNC were higher than those in control group(P<0.05). Among the patients with CHD, the frequencies of GG genotype and G allele of patients in Hainan were lower than those in TPNC(P<0.05), and in CHD group, the levels of TG, TC and LDL-C of GG genotype were higher than those of AA genotype(P<0.05). While in non-CHD group, there were no significant differences between the frequencies of GG genotype and G allele of patients in Hainan and TPNC(P>0.05). Conclusions: There was a close correlation between the E670 G polymorphism of PCSK9 gene and CHD with serum lipid level. Among Han population in Hainan and TPNC, the E670 G polymorphism of PCSK9 gene of patients with CHD exhibited regional differences. 展开更多
关键词 PCSK9 GENE E670G POLYMORPHISM han population Coronary heart disease Regional difference
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