检索结果-南通市图书馆

A New Macrocyclic Trichochecene from Soil Fungus

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第1期13卷 67-68页

作者： Tao WANG Yi ZHANG Yue Hu PEI Hui ming HUA bao min feng Department of Natural Products Chemistry Shenyang Pharmaceutical UniversityShenyang 110016

From fermentation broth of soil fungus 254-2 obtained from Yunnan province, a new macrocylic trichochecene was isolated. The structure was determined on the basis of spectroscopic evidences especially the 2-D NMR spe... 详细信息

关键词： Soil fungus macrocyclic trichochecene spectral data.

Two new kaempferol glycosides from the seeds of Camellia semiserrata Chi

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第7期22卷 835-838页

作者： Ling Tang Xiao Juan Wu bao min feng Li Ying Shi Xue Yan Fu Yong Qi Wang Mei feng Liu College of Bioengineering Dalian University Dalian 116622 China Liaoning Key Laboratory of Bioorganic Chemistry Dalian University Dalian 116622 China Pharmaceutical Department Ningxia Medical University Yinchuan 750004 China School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China

Two new acetylated kaempferol glycosides were isolated from the seeds of Camellia semiserrata Chi, their structures were elucidated as kaempferol-3-O-[（3-O-acetyl）-a-L-rhamnopyranosyl（1 →3）（4-O-acetyl）-α-L-rhamnopyranosyl（1→ 6）-β-D-glucopyranoside] （1） and kaempferol-3-O-[（2-O-acetyl）-α-L-rhamnopyranosyl （1 →3）（4-O-acetyl）-α-L-rhamnopyranosyl（1 →6）-β-D- gluco-pyranoside] （2） by spectral experiments （including ESI-MS, 1D- and 2D-NMR）..

关键词： Camellia semiserrata Chi Kaempferol glycosides Theaceae

Two new secolignans from the roots of Urtica mairei Levi.

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第10期19卷 1212-1214页

作者： Wei Wang Xing Guo Yan Li Xin Duan Yuan Zhou Ling Tang Yong Qi Wang bao min feng College of Bioengineering Dalian University Economic and Development Zone Dalian 116622 China Center for Signal Transduction and Metabolomics Institute of Botany Chinese Academy of Sciences Beijing 10093 China Liaoning Key Laboratory of Bioorganic Chemistry Dalian University Economic and Development Zone Dalian 116622 China

Two new secolignans （1 and 2） were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D N... 详细信息

关键词： Urtica mairei Levi. Secolignans Urticaceae

Adaptation of Ocular Opponency Neurons Mediates Attention-Induced Ocular Dominance Plasticity

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2024年第3期40卷 339-349页

作者： Fangxing Song Lili Lyu min bao CAS Key Laboratory of Behavioral Science Institute of PsychologyChinese Academy of SciencesBeijing100101China Department of Psychology University of Chinese Academy of SciencesBeijing100049China Institute of Neuroscience Key Laboratory of Primate NeurobiologyCAS Center for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China

Previous research has shown that ocular dominance can be biased by prolonged attention to one *** ocular-opponency-neuron model of binocular rivalry has been proposed as a candidate account for this *** direct neural evidence is still *** manipulating the contrast of dichoptic testing gratings,here we measured the steady-state visually evoked potentials(SSVEPs)at the intermodulation frequencies to selectively track the activities of ocular-opponency-neurons before and after the“dichoptic-backward-movie”*** hour of adaptation caused a shift of perceptual and neural ocular dominance towards the unattended *** importantly,we found a decrease in the intermodulation SSVEP response after adaptation,which was significantly greater when high-contrast gratings were presented to the attended eye than when they were presented to the unattended *** results strongly support the view that the adaptation of ocular-opponency-neurons contributes to the ocular dominance plasticity induced by prolonged eye-based attention.

关键词： Attention Ocular dominance Opponency neuron Adaptation Steady-state visually evoked potential

Spatiotemporal changes of gross primary productivity and its response to drought in the Mongolian Plateau under climate change

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Arid Land 2024年第1期16卷 46-70页

作者： ZHAO Xuqin LUO min MENG Fanhao SA Chula bao Shanhu bao Yuhai College of Geographical Science Inner Mongolia Normal UniversityHohhot 010022China Inner Mongolia Key Laboratory of Remote Sensing and Geographic Information Systems Hohhot 010022China

Gross primary productivity(GPP)of vegetation is an important constituent of the terrestrial carbon sinks and is significantly influenced by *** the impact of droughts on different types of vegetation GPP provides insight into the spatiotemporal variation of terrestrial carbon sinks,aiding efforts to mitigate the detrimental effects of climate *** this study,we utilized the precipitation and temperature data from the Climatic Research Unit,the standardized precipitation evapotranspiration index(SPEI),the standardized precipitation index(SPI),and the simulated vegetation GPP using the eddy covariance-light use efficiency(EC-LUE)model to analyze the spatiotemporal change of GPP and its response to different drought indices in the Mongolian Plateau during *** main findings indicated that vegetation GPP decreased in 50.53% of the plateau,mainly in its northern and northeastern parts,while it increased in the remaining 49.47%***,meadow steppe(78.92%)and deciduous forest(79.46%)witnessed a significant decrease in vegetation GPP,while alpine steppe(75.08%),cropland(76.27%),and sandy vegetation(87.88%)recovered *** aridification areas accounted for 71.39% of the affected areas,while 28.53% of the areas underwent severe aridification,mainly located in the south and central ***,the warming aridification areas of desert steppe(92.68%)and sandy vegetation(90.24%)were *** warming was found to amplify the sensitivity of coniferous forest,deciduous forest,meadow steppe,and alpine steppe GPP to ***,the drought sensitivity of vegetation GPP in the Mongolian Plateau gradually decreased as altitude *** cumulative effect of drought on vegetation GPP persisted for 3.00-8.00 *** findings of this study will improve the understanding of how drought influences vegetation in arid and semi-arid areas.

关键词： gross primary productivity(GPP) climate change warming aridification areas drought sensitivity cumulative effect duration(CED) Mongolian Plateau

Multi-omics analyses provide insights into the evolutionary history and the synthesis of medicinal components of the Chinese wingnut

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2024年第3期46卷 309-320页

作者： Zi-Yan Zhang He-Xiao Xia Meng-Jie Yuan feng Gao Wen-Hua bao Lan Jin min Li Yong Li College of Life Science and Technology Inner Mongolia Normal UniversityHohhot 010020China Key Laboratory of Biodiversity Conservation and Sustainable Utilization in Mongolian Plateau for College and University of Inner Mongolia Autonomous Region Hohhot 010022China College of Landscape and Art Henan Agricultural UniversityZhengzhou 450002China State Key Laboratory of Tree Genetics and Breeding Chinese Academy of ForestryBeijing 100091China

Chinese wingnut(Pterocarya stenoptera)is a medicinally and economically important tree species within the family ***,the lack of high-quality reference genome has hindered its in-depth *** this study,we successfully assembled its chromosome-level genome and performed multiomics analyses to address its evolutionary history and synthesis of medicinal components.A thorough examination of genomes has uncovered a significant expansion in the Lateral Organ Boundaries Domain gene family among the winged group in *** notable increase may be attributed to their frequent exposure to flood-prone *** further differentiation between Chinese wingnut and Cyclocarya paliurus,significant positive selection occurred on the genes of NADH dehydrogenase related to mitochondrial aerobic respiration in Chinese wingnut,enhancing its ability to cope with waterlogging *** genomic analysis revealed Chinese wingnut evolved more unique genes related to arginine synthesis,potentially endowing it with a higher capacity to purify nutrient-rich water *** of terpene synthase families enables the production of increased quantities of terpenoid volatiles,potentially serving as an evolved defense mechanism against herbivorous *** combined transcriptomic and metabolomic analysis,we identified the candidate genes involved in the synthesis of terpenoid *** study offers essential genetic resources for Chinese wingnut,unveiling its evolutionary history and identifying key genes linked to the production of terpenoid volatiles.

关键词： Genome Medicinal components Metabolome Pterocarya stenoptera Transcriptome

Systematic Evaluation of Guidelines for the Diagnosis and Treatment of Hepatitis E Virus Infection

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2024年第8期12卷 739-749页

作者： Ting Gu Cai-Ying Zheng Yan-Qin Deng Xiao-feng Yang Wei-min bao Ying-Mei Tang Department of Gastroenterology Second Affiliated Hospital of Kunming Medical UniversityKunming Medical UniversityKunmingYunnanChina Second Affiliated Hospital of Kunming Medical University KunmingYunnanChina Department of Colorectal Surgery The First People’s Hospital of Yunnan ProvinceKunmingYunnanChina

Background and Aims:The hepatitis E virus(HEV)is a zoonotic disease,and infection with HEV in humans primarily causes acute infections and can progress to chronic manifestation in immunocompromised *** the past decade,guidelines for diagnosing and treating HEV infection have been *** study aimed to systematically assess the quality of current guidelines for diagnosing and treating HEV infection,and we analyzed the differences in guideline quality and primary recommendations and explored possible reasons for these ***:Guidelines published between 2013 and 2022 were searched,and studies were identified using selection *** study assessed the quality of the included guidelines using the Appraisal of Guidelines for Research and Evaluation tool,extracted the primary recommendations in the guidelines,determined the highest level of evidence supporting the recommendations,and reclassified the evidence using the Oxford Centre for Evidence-Based Medicine grading ***:Seven guidelines were included in the final *** quality of the guidelines varied *** discrepancies may have been caused by the lack of external experts,the failure to consider influencing factors in guideline application,and the lack of consideration of the public’s *** of the heterogeneity in primary recommendations revealed differences in algorithms for managing chronic HEV infection,the dosage of ribavirin,and a low level of evidence supporting the primary ***:Guideline quality and primary recommendations vary *** by guideline developers and researchers would facilitate updating and applying guidelines for diagnosing and treating HEV infection.

关键词： Hepatitis E virus Guidelines Diagnosis Treatment Systematic Evaluation

A dual-function selection system enables positive selection of multigene CRISPR mutants and negative selection of Cas9-free progeny in Arabidopsis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

aBIOTECH 2024年第2期5卷 140-150页

作者： feng-Zhu Wang Ying bao Zhenxiang Li Xiangyu Xiong Jian-feng Li State Key Laboratory of Biocontrol Guangdong Provincial Key Laboratory of Plant ResourcesSchool of Life SciencesSun Yat-sen UniversityGuangzhou 510275China

The CRISPR/Cas9 technology revolutionizes targeted gene knockout in diverse organisms including ***,screening edited alleles,particularly those with multiplex editing,from herbicide-or antibiotic-resistant transgenic plants and segregating out the Cas9 transgene represent two laborious *** solutions to facilitate these processes rely on different selection ***,by taking advantage of the opposite functions of a D-amino acid oxidase(DAO)in detoxifying D-serine and in metabolizing non-toxic D-valine to a cytotoxic product,we develop a DAO-based selection system that simultaneously enables the enrichment of multigene edited alleles and elimination of Cas9-containing progeny in Arabidopsis *** five DAOs tested in Escherichia coli,the one encoded by Trigonopsis variabilis(TvDAO)could confer slightly stronger D-serine resistance than other *** expression of TvDAO in Arabidopsis allowed a clear distinction between transgenic and nontransgenic plants in both D-serine-conditioned positive selection and D-valine-conditioned negative *** a proof of concept,we combined CRISPR-induced single-strand annealing repair of a dead TvDAO with D-serine-based positive selection to help identify transgenic plants with multiplex editing,where D-serine-resistant plants exhibited considerably higher co-editing frequencies at three endogenous target genes than those selected by ***,D-valine-based negative selection successfully removed Cas9 and TvDAO transgenes from the survival offspring carrying inherited ***,this work provides a novel strategy to ease CRISPR mutant identification and Cas9 transgene elimination using a single selection marker,which promises more efficient and simplified multiplex CRISPR editing in plants.

关键词： CRISPR Genome editing D-amino acid oxidase Cas9-free Selection marker

Short-time maritime target detection based on polarization scattering characteristics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 55-64页

作者： CHEN Shichao LUO feng TIAN min LYU Wanghan College of Computer and Information Engineering(College of Artificial Intelligence) Nanjing Tech UniversityNanjing 211816China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200China

In this paper,a detection method combining Cameron decomposition based on polarization scattering characteristics in sea clutter background is ***,the Cameron decomposition is exploited to fuse the radar echoes of full polarization channels at the data *** to the artificial material structure on the surface of the target,it can be shown that the non-reciprocity of the target cell is stronger than that of the clutter ***,based on the analysis of the decomposition results,a new feature with scattering geometry characteristics in polarization domain,denoted as Cameron polarization decomposition scattering weight(CPD-SW),is extracted as the test statistic,which can achieve more detailed descriptions of the clutter scattering characteristics utilizing the difference between their scattering ***,the superiority of the proposed CPD-SW detector over traditional detectors in improving detection performance is verified by the IPIX measured dataset,which has strong stability under short-time observation in threshold detection and can also improve the separability of feature space zin anomaly detection.

关键词： sea clutter small target radar detection Cameron decomposition characteristics analysis