检索结果-南通市图书馆

Wildfire associated with a deciduous broadleaved forest from the Neogene Baoshan Basin at the southeastern margin of the Tibetan Plateau

引用

古地理学报:英文版 2023年第3期12卷 448-462页

作者： Yong-Jiang Huang Arata Momohara Shu-Feng Li Xue-ping Ji Jian Qiu Lin-Bo Jia Jin-Jin Hu Yun-Heng Ji Zhe-Kun Zhou Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201Yunnan ProvinceChina Graduate School of Horticulture Chiba UniversityChiba 271-8510Japan Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303Yunnan ProvinceChina Kunming Natural History Museum of Zoology Kunming Institute of ZoologyChinese Academy of SciencesKunming 650223Yunnan ProvinceChina School of Material and Chemical Engineering Southwest Forestry UniversityKunming 650224Yunnan ProvinceChina

Wildfire bears a close relationship with vegetation as its fuel source.The southeastern margin of the Tibetan Plateau witnesses frequent wildfires among various types of vegetation,whereas such wide in-teractions between wildfire and vegetation remain poorly studied from geological times.In this study,we reported a local fire using sedimentary macroscopic charcoals from the latest Miocene to early Pliocene of the Baoshan Basin in this region,and then inferred the local vegetation at the time of the fire event based chiefly on the coexistent fruit and seed fossil assemblage.Our taxonomic results show that the charcoal assemblage is probably dominated by broadleaved plants and the fruit and seed fossil assemblage is apparently dominated by Salix(Salicaceae)followed by sambucus(Adoxaceae),suggesting a deciduous broadleaved forest in which the fire likely occurred.Under a seasonally dry climate associated with the Asian monsoon,this type of vegetation might be prone to natural fire,because in the wet rainy season the plants grew well to accumulate biofuel and in the dry season abundant ground litter resulting from leaf decay would be desiccated to become highly flammable.Due to the fire-tolerant habit of Salix as the dominant plant,the forest might be in return adapted to the fire event or even more fires that potentially followed.All these may suggest a close relationship between the fire event and the reconstructed vegetation.Our finding documents a new type of wildfire—vegetation interaction,namely the interaction between wildfire and deciduous broadleaved forest,from the geological past at the southeastern margin of the Tibetan Plateau.It therefore sheds new light on the wildfire history coupling vegetation change in the region.

关键词： Charcoal Fossil carpology Salix sambucus Precipitation seasonality

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Antioxidant,Hypoglycemic and Hypolipidemic Activities of sambucus williamsii Seed Oil

引用

Medicinal Plant 2018年第5期9卷 45-50,53页

作者： Wei HU Hui LI Kewu LIU Forest By-product and Speciality Institute in Heilongjiang Province Key Laboratory of Non-wood Forest Products in Heilongjiang Province Zhaoyuan County Meteorological Bureau of Heilongjiang Province

[Objectives] To explore the antioxidant activity of sambucus williamsii seed oil. [Methods]DPPH scavenging method and Prussian blue method( total reducing power) were used. S. williamsii seed oil has antioxidant activity. In the DPPH scavenging free radical experiment,S. williamsii oil showed the ability to scavenge free radicals,and its scavenging ability had linear relationship with oil concentration( R =0. 999 6). Besides,the IC_(50) value of S. williamsii seed oil scavenging DPPH free radicals was 61. 30 ± 0. 88 mg/mL. In the total reducing power measurement experiment,the S. williamsii seed oil has a reducing ability,and its reducing ability is proportional to the oil concentration,and has the concentration dependence. Through studying the inhibitory effect of S. williamsii seed oil on α-glucosidase,the hypoglycemic activity of S. williamsii seed oil was determined. The ability of samples to inhibit α-glucosidase was judged through measuring the absorbance at 400 nm of the reaction system. [Results]In the concentration range of 1. 56-25. 00 mg/mL,the S. williamsii seed oil can effectively inhibit α-glucosidase,and the inhibition rate was 62. 66%-85. 22%. The animal in vivo experiment was used to determine the hypolipidemic activity of the S. williamsii seed oil. First,a high fat modelwas established,S. williamsii seed oil was given through intragastric administration. Then,total cholesterol( TC),triglyceride( TG),high-density lipoprotein cholesterol( HDL-C),and low density lipoprotein cholesterol( LDL-C) were measured. Through comparison of high,medium and low dose groups of S. williamsii seed oil with the high fat modelcontrol group,it was found that the TC,TG,LDL-C levels were significantly decreased( P < 0. 01) and the HDL-C levels were significantly increased( P < 0. 05),indicating that S. williamsii seed oil can effectively reduce the levels of TC,TG,LDL-C in the serum of hyperlipidemic mice,and effectively inhibit the decrease of HDL-C level,thus S. williamsii seed oil can reduce blood lipids in mice,n

关键词： sambucus williamsii seed oil Antioxidant activity Hypoglycemic activity Hypolipidemic activity

来源：

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

A mimetic peptide of α2,6-sialyllactose promotes neuritogenesis

引用

Neural Regeneration Research 2020年第6期15卷 1058-1065页

作者： Shuang-Xi Chen Jia-Hui He Yong-Jian Mi Hui-Fan Shen Melitta Schachner Wei-Jiang Zhao Center for Neuroscience Shantou University Medical CollegeShantouGuangdong ProvinceChina Department of Neurology The First Affiliated Hospital of University of South ChinaHengyangHunan ProvinceChina Department of Neurology Chongqing Qijiang Renmin HospitalChongqingChina Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience Rutgers UniversityPiscatawayNJUSA

Oxidative stress contributes to the pathogenesis of neurodegenerative diseases.With the aim to find reagents that reduce oxidative stress,a phage display library was screened for peptides mimicking a2,6-sialyllactose(6'-SL),which is known to beneficially influence neural functions.Using sambucus nigra lectin,which specifically binds to 6'-SL,we screened a phage display library and found a peptide comprising identical sequences of 12 amino acids.Mimetic peptide,reverse peptide and scrambled peptide were tested for inhibition of 6'-SL binding to the lectin.Indeed,lectin binding to 6'-SL was inhibited by the most frequently identified mimetic peptide,but not by the reverse or scrambled peptides,showing that this peptide mimics 6'-SL.Functionally,mimetic peptide,but not the reverse or scrambled peptides,increased viability and expression of neural cell adhesion molecule L1 in SK-N-SH human neuroblastoma cells,and promoted survival and neurite outgrowth of cultured mouse cerebellar granule neurons challenged by H_20_2-induced oxidative stress.The combined results indicate that the 6'-SL mimetic peptide promotes neuronal survival and neuritogenesis,thus raising hopes for the treatment of neurodegenerative diseases.This study was approved by the Medical Ethics Committee of Shantou University Medical College,China(approval No.SUMC 2014-004)on February 20,2014.

关键词： central nervous system cerebellar granule neurons mimetic peptide neural cell adhesion molecule L1 neuritogenesis neurodegenerative disease neuronal survival oxidative stress phage display sambucus nigra lectin α2,6-sialyllactose

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plasma Accumulations of Vitamin B6 from an Oral Dose in a New Reversible Model for Mouse Gut Injury and Regeneration

引用

Food and Nutrition Sciences 2013年第9期4卷 908-917页

作者： Pilar Jiménez Damián Cordoba-Diaz Patricia Cabrero Mónica Aracil Manuel J. Gayoso Manuel Garrosa Manuel Cordoba-Diaz Tomás Girbés Biología Celular Histología y Farmacología Facultad de Medicina and INCYL (Instituto de Neurociencias de Castilla y León) Universidad de Valladolid Valladolid Spain. Farmacia y Tecnología Farmacéutica Facultad de Farmacia and IUFI (Instituto Universitario de Farmacia Industrial) Universidad Complutense de Madrid Madrid Spain Nutrición y Bromatología Facultad de Medicina and CINAD (Centro de Investigación en Nutrición Alimentación y Dietética- Edificio LUCIA-Parque Científico) Universidad de Valladolid Valladolid Spain

Chemically based rodent models are used to assess the positive effects promoted by foods and gut microbiota on gut health. Lectins with enzymatic activity, such as type 2 ribosome-inactivating proteins, might also prove useful for exploring these issues. Sub-lethal doses of the lectin nigrin from sambucus nigra L. to mice promoted reversible derangement of gut epithelium by induction of apoptosis of transit amplifying cells of the small intestine crypts in a time-dependent course. The present work seeks to study vitamin B6 accumulation in plasma from an oral bolus in a mouse nigrin model. 24 h after sub-lethal nigrin b treatment, there was clear body weight reduction associated to a notable increase in Evan’s blue stain accumulation in excised small intestine, an increase in myeloperoxidase activity, and a near 50% reduction in plasma accumulation of vitamin B6. Histological analysis of small intestine sections of nigrin b-treated animals also revealed significant derangement of intestinal crypts. Seventy two hours after nigrin b treatment, stain uptake decreased and vitamin B6 accumulation was almost restored despite villi derangement. Large intestine crypts were scarcely or not at all affected. Eight days after nigrin b treatment, vitamin B6 uptake and intestinal crypt structure had fully recovered. The nigrin b mice model supports the view that, under these conditions, the carrier-mediated vitamin B6 uptake component of the small intestine crypts is probably the most active when the vitamin is administered orally as a bolus. The findings provide insights into the suitability of the present mice model for nutritional or drug absorption studies in conditions of partially altered or injured intestinal mucosa.

关键词： Vitamin B6 Nigrin b Ribosome-Inactivating Protein sambucus Ricin Intestines Mice Model

来源：

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

接骨木培育及应用研究进展

引用

林业科技通讯 2017年第9期 56-60页

作者：于宏影韦睿林琳闫晓娜国家林业局哈尔滨林业机械研究所哈尔滨150086

接骨木(sambucus williamsii Hance.)为忍冬科接骨木属落叶灌木或小乔木,分布广泛,是药食兼有的经济作物,同时也是珍稀的野生木本油料植物,具有较高的营养价值和药理活性。综述了接骨木的繁育技术、化学成分和药理活性,并由此提出展望,... 详细信息

接骨木(sambucus williamsii Hance.)为忍冬科接骨木属落叶灌木或小乔木,分布广泛,是药食兼有的经济作物,同时也是珍稀的野生木本油料植物,具有较高的营养价值和药理活性。综述了接骨木的繁育技术、化学成分和药理活性,并由此提出展望,希望为接骨木以后的研究奠定坚实的理论基础。

关键词：接骨木 sambucus williamsii 繁殖方式化学成分药用价值研究进展

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：