检索结果-南通市图书馆

马尾松根际溶磷细菌Paraburkholderia sp.的筛选、鉴定及溶磷特性研究

在线全文

学校读者我要写书评

暂无评论

生物技术通报 2020年第9期36卷 147-156页

作者：吕俊潘洪祥于存贵州大学林学院贵阳550025

由马尾松根际筛选高效溶磷细菌,为马尾松幼苗的人工培育及微生物菌肥提供菌种资源。利用稀释涂布平板法和钼锑抗比色法从马尾松根际土壤中分离、筛选溶磷细菌,根据形态特征、生理生化及16s rdNA序列分析对菌株进行鉴定;通过检测菌株对4... 详细信息

由马尾松根际筛选高效溶磷细菌,为马尾松幼苗的人工培育及微生物菌肥提供菌种资源。利用稀释涂布平板法和钼锑抗比色法从马尾松根际土壤中分离、筛选溶磷细菌,根据形态特征、生理生化及16s rdNA序列分析对菌株进行鉴定;通过检测菌株对4种不同难溶性磷酸盐的溶解量,筛选出较易被溶解的磷酸盐后,探究其在不同条件下对该磷酸盐的溶解特性;通过测定接种菌株的马尾松幼苗生物量、磷素含量以及根际土壤有效磷含量等指标分析其对马尾松幼苗生长的影响。从马尾松根际分离得到一株具有较好溶磷能力的菌株WJ2,该菌株在无机磷液体培养基内培养5 d后,其溶磷量达244.13 mg/l,经综合鉴定该菌株属于伯克霍尔德菌属(Paraburkholderia sp.)。菌株WJ2对4种不同无机磷酸盐的溶解能力依次为Ca3(PO4)2(204.42 mg/l)>AlPO4(177.70 mg/l)>FePO4·2H2O(151.82 mg/l)>CaHPO4·2H2O(108.19 mg/l)。Pearson相关分析表明,菌株WJ2对这4种磷酸盐的溶解量与培养液pH值均呈显著负相关关系。该菌株在以乳糖、葡萄糖作为碳源,以尿素、硫酸铵、硝酸铵等作为氮源时对Ca3(PO4)2表现出较强的溶解能力,在C/N为10∶1、NaCl含量为0 g/l、初始pH为8.0的条件下溶磷能力较高。在盆栽试验中,与对照相比,接种菌株WJ2能显著提高马尾松幼苗的苗高、主根长、鲜重,增加量分别为11.74%、45.73%、46.00%。此外,接种菌株WJ2的土壤有效磷含量和植株磷素含量与对照相比也显著增加,增加量分别为18.32%和13.82%。菌株WJ2能够溶解多种难溶性无机磷酸盐,对提高土壤有效磷含量和促进马尾松幼苗生长的效果显著,有望为开发高效微生物磷肥提供种质资源。

关键词：细菌溶磷特性碳源氮源 C/N 生物磷肥

Traditional Chinese medicine targets on hepatic stellate cells for the treatment of hepatic fibrosis: A mechanistic review

在线全文

学校读者我要写书评

暂无评论

Portal Hypertension & Cirrhosis 2023年第1期2卷 16-31页

作者： dengcheng Hui lu liu Yanqin Bian Nisma l.B.Azami Jingru song Yanping Huang Mingyu sun shuguang Hospital Affiliated to shanghai University of Traditional Chinese Medicine ShanghaiChina shanghai University of Traditional Chinese Medicine ShanghaiChina Key laboratory of liver and Kidney diseases Institute of Liver DiseasesShuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghaiChina Arthritis Institute of Integrated Chinese and Western Medicine Guanghua Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghaiChina department of Gastroenterology Hangzhou TCM Hospital Affiliated to Zhejiang Chinese Medical UniversityHangzhouZhejiangChina department of Good Clinical Practice Office Tongren HospitalShanghai Jiao Tong ShanghaiJiaotong University School of MedicineShanghaiChina

liver cirrhosis is a leading cause of death from liver‐related diseases accompanied by a variety of complications;however,hepatic fibrosis,an inevitable stage of cirrhosis,is possible to be reversed and *** stellate cells(HsCs)are the primary cells that secrete extracellular matrix in the liver and play a dominant role in the pathogenesis of hepatic *** therapeutic approaches for reversing hepatic fibrosis aim at inhibiting the activation of HsCs and inducing their inactivation or *** review highlights the mechanism by which traditional Chinese medicine(TCM)regulates the activity of HsCs and exerts antifibrotic effects,providing insights and prospects for the treatment of hepatic fibrosis with TCM.

关键词： extracellular matrix hepatic fibrosis hepatic stellate cells Traditional Chinese medicine

2013~2017年中国重点区域颗粒物质量浓度和化学成分变化趋势

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

中国科学：地球科学 2020年第4期50卷 453-468页

作者：王跃思李文杰高文康刘子锐田世丽沈蓉蓉吉东生王帅王莉莉唐贵谦宋涛程萌田王格慧宫正宇郝吉明张远航中国科学院大气物理研究所大气边界层物理与大气化学国家重点实验室北京100029 中国环境监测总站北京100012 华东师范大学地理学院地理信息科学教育部重点实验室上海200241 清华大学环境学院北京100084 北京大学环境科学与工程学院北京100871 中国科学院大学北京100049 兰州大学大气科学学院兰州730000 中国科学院区域大气环境卓越中心厦门361021

对大气颗粒物浓度及其化学组分精准观测有助于探究大气霾污染的成因与来源解析,评价环境空气质量控制策略的合理性.文章基于CARE-China观测网中中国重点区域典型站点大气PM2.5膜采样和分不同粒径段颗粒物采样及化学成分数据,结合同期中... 详细信息

对大气颗粒物浓度及其化学组分精准观测有助于探究大气霾污染的成因与来源解析,评价环境空气质量控制策略的合理性.文章基于CARE-China观测网中中国重点区域典型站点大气PM2.5膜采样和分不同粒径段颗粒物采样及化学成分数据,结合同期中国环境监测总站发布的环境空气质量数据,评估分析了中国2013~2017年《大气污染防治行动计划》实施期间,全国及重点区域大气颗粒物质量浓度的变化及其相应化学组成的演变.研究结果表明:(1)研究期内,中国环境空气颗粒物年平均浓度整体呈明显下降趋势,但仍有64%的城市PM2.5年平均浓度未达到中国现行标准(GB3095-2012).太行山东麓、汾渭平原和新疆乌昌等地区大气PM2.5浓度负荷依然较高,秋冬季重霾污染频发.(2)秋冬季重污染期间,颗粒物中硫酸盐和有机组分质量浓度下降明显.京津冀、珠三角、成渝和汾渭平原地区PM2.5中sO42-平均浓度分别下降了76%、12%、81%和38%;OM平均浓度分别下降70%、44%、48%和31%;NH4+平均浓度分别下降68%、1.6%、38%和25%. EC平均浓度在京津冀和成渝分别下降84%和20%,在珠三角和汾渭平原地区分别上升61%和11%;矿尘及未解析的化学成分(MI)平均浓度在京津冀、珠三角和汾渭平原地区下降了70%、24%和13%. PM2.5中化学成分的变化量,总体上与PM2.5质量浓度的下降量相一致.(3)相比2013年, 2015年京津冀、长三角、珠三角和成渝地区粗颗粒物中OM平均浓度下降46~57%,MI分别下降31~60%和39~73%,是颗粒物浓度下降的最主要因素. 2013~2015年,不同粒径段化学组分中,粗粒径段峰值降低显著,并且随着不同粒径段中颗粒物质量浓度的降低,其sO42-、NO3-和NH4+的细粒径段峰值从0.65~1.1μm转移到更细的0.43~0.65μm粒径段.

关键词： PM2.5 “大气十条” 重点区域化学组成粒径分布变化特征

在线全文

学校读者我要写书评

暂无评论

形态差别与文化渊源:中西诗歌爱情主题探究

学习与探索 2001年第6期 93-98页

作者：代迅西南师范大学中文系重庆400715

中国诗歌传统主题是忠君爱国 ,西方诗歌以爱情为中心。西方诗歌的这种爱情传统和骑士文学有直接联系 ,中国“诗言志”的政治抒情传统严重限制了爱情诗的发展空间。西方诗歌中体现为对爱情大胆率真的歌唱 ,包含有强烈的性爱因素。中国诗... 详细信息

中国诗歌传统主题是忠君爱国 ,西方诗歌以爱情为中心。西方诗歌的这种爱情传统和骑士文学有直接联系 ,中国“诗言志”的政治抒情传统严重限制了爱情诗的发展空间。西方诗歌中体现为对爱情大胆率真的歌唱 ,包含有强烈的性爱因素。中国诗歌通常不能大胆地袒露男女之爱的欲与情 ,情感较为理性化和逻辑化。中西诗歌爱情主题的不同形态包含着中西文化的深刻差别。

关键词：中国诗歌西方诗歌爱情主题

degenerate black rings in d=5 minimal supergravity

在线全文

学校读者我要写书评

暂无评论

science China(Physics,Mechanics & Astronomy) 2021年第11期64卷 44-56页

作者： shi-Fa Guo Hong lu Yi Pang Center for Joint Quantum studies and department of Physics School of ScienceTianjin UniversityTianjin 300350China

We consider both gauged and ungauged minimal supergravities in five dimensions and analyse the charged rotating solutions with two equal angular momenta *** the electric charge Q∼J^(2/3) with some specific coefficient,we find new extremal black objects emerge that are asymptotic to either Minkowski or global Ads spacetimes and can be best described as degenerate black *** near-horizon geometry is locally Ads3×s^(2),where the periodic U(1)fibre coordinate in s 3 untwists and collapses to be the degenerate part of the Ads3 *** turns out that there are two branches of extremal rotating black holes,starting as the extremal RN black holes of the same mass,but opposite *** the increasing of the angular momentum,they will join to become the same degenerate black ring,where the Gibbs free energies however are not continuous at the *** the same Q(J)relation,we find that there is in addition a rotating soliton whose mass is smaller than that of the degenerate black ring.

关键词： supergravity higher-dimensional gravity black holes black rings thermodynamics

A six-gene phylogenetic overview of Basidiomycota and allied phyla with estimated divergence times of higher taxa and a phyloproteomics perspective

在线全文

学校读者我要写书评

暂无评论

Fungal diversity 2017年第3期84卷 43-74页

作者： Rui-lin Zhao Guo-Jie li santiago sanchez-Ramirez Matt stata Zhu-liang Yang Gang Wu Yu-Cheng dai shuang-Hui He Bao-Kai Cui Jun-liang Zhou Fang Wu Mao-Qiang He Jean-Marc Moncalvo Kevin d.Hyde state Key laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesChaoyang DistrictBeijing 100101China College of life sciences University of Chinese Academy of SciencesHuairou DistrictBeijing 100408China department of Ecology and Evolutionary Biology University of TorontoTorontoON M5S 3B2Canada department of Natural History Royal Ontario MuseumTorontoON M5S 2C6Canada Key laboratory for Plant diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina Institute of Microbiology and Beijing Key laboratory for Forest Pest Control Beijing Forestry UniversityBeijing 100083China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand Key laboratory of Economic Plants and Biotechnology Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina

In this paper,we provide a phylogenetic overview of Basidiomycota and related phyla in relation to ten years of dNA based phylogenetic studies since the AFTOl publications in *** selected 529 species to address phylogenetic relationships of higher-level taxa using a maximumlikelihood framework and sequence data from six genes traditionally used in fungal molecular systematics(nrlsU,nrssU,5.8s,tef1-a,rpb1 and rpb2).These species represent 18 classes,62 orders,183 families,and 392 genera from the phyla Basidiomycota(including the newly recognized subphylum Wallemiomycotina)and Entorrhizomycota,and 13 species representing 13 classes of Ascomycota as outgroup *** also conducted a molecular dating analysis based on these six genes for 116 species representing 17 classes and 54 orders of Basidiomycota and *** we performed a phyloproteomics analysis from 109 Basidiomycota species and 6 outgroup taxa using amino-acid sequences retrieved from 396 orthologous *** of higher taxa follows the criteria in Zhao et al(Fungal divers 78:239–292,2016):(i)taxa must be monophyletic and statistically well-supported in molecular dating analyses,(ii)their respective stem ages should be roughly equivalent,and(iii)stem ages of higher taxa must be older than those of lower level *** time-tree indicates that the mean of stem ages of Basidiomycota and Entorrhizomycota are ca.530 Ma;subphyla of Basidiomycota are 406–490 Ma;most classes are 358–393 Ma for those of Agaricomycotina and 245–356 Ma for those of Pucciniomycotina and Ustilaginomycotina;most orders of those subphyla split 120–290 *** of most higherlevel taxa of Basidiomycota are generally supported,especially those taxa introduced in the recent ten years:phylum Entorrhizomycota,classes Malasseziomycetes,Moniliellomycetes,spiculogloeomycetes,Tritirachiomycetes and orders Amylocorticiales,Golubeviales,Holtermanniales,Jaapiales,lepidostromatales,Robbauerales,stereops.d.l.s and Tricho

关键词： Fungi systematics Taxonomy Wallemiomycotina

Variation in Chromosome Constitution of the Xiaoyan series Partial Amphiploids and Its Relationship to stripe Rust and stem Rust Resistance

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 Genetics and Genomics 2015年第11期42卷 657-660页

作者： Qi Zheng Qiaoling luo Zhixia Niu Hongwei li Bin li steven s.Xu Zhensheng li state Key laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of Science department of Plant sciences North Dakota State University

The wild relatives of wheat （Triticum aestivum l.） contain tremendous amounts of potentially useful genes and represent a promising source of genetic diversity for wheat improvement （Bommineni and Jauhar, 1997）. Thinopyrum ponticum （Popd.） Barkworth and d. R. dewey [syn. Agropyron elongatum （Host） P. Beauv., Elytrigia pontica （Podp.） Holub, lophopy- rum ponticum （Podp.） A. l6ve] （2n = 10x = 70）, has high crossability with various Triticum species. Numerous studies have shown that Th. ponticum carries many potentially valu- able resistance genes against biotic and abiotic stresses （shannon, 1978; Cox, 1991; Zheng et al., 2014a,b）. Transferring the useful genes from Th. ponticum to common wheat through chromosome engineering had been a successful way to enhance the resistance of wheat to pests and diseases （sharma et al., 1989; McIntosh, 1991）.

关键词： Th Variation in Chromosome Constitution of the Xiaoyan series Partial Amphiploids and Its Relationship to stripe Rust and stem Rust Resistance FIsH GIsH IT

Influence of Humidity on Yield stress determination by slump Test of slip-Prone Clayey soils and Their Relation with the Chemical Properties

在线全文

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2012年第4期2卷 102-105页

作者： Arturo F. Méndez-sánchez Ana M. Paniagua-Mercado Karen E. Nieto-Zepeda leonor Pérez-Trejo Elvia diaz Valdés Concepción Mejía García Escuela superior de Física y Matemáticas Instituto Politécnico Nacional Edif. 9 Unidad Profesional Adolfo López Mateos Col. Lindavista C. P. 07738 México D. F. México.

In this work, the yield stress evaluation as a function of water content for slip-prone clayey soils is studied in order to understand how yield stress decreases as water content increases, and their relation with the chemical properties. The clayey soil samples were taken from the region of Teziutlán-Puebla-Mexico. Yield stress was calculated using the slump test in cylindrical geometry. Results show three zones. The first one shows an exponential decrement on yield stress due to lower water content in accord with clayey soils with high content of illita, followed by a second region where yield stress decreases dramatically at a certain critical water concentration, and the third one where yield stress dependence is not well-defined since the clayey soil flow is seen. Finally, it is discussed how yield stress variation due to the water increment influences the landslide risk increment.

关键词： Clayey soil Yield stress slump Test Microstructure Illita

乳腺MRI检查中检出乳腺外病变的概率、临床相关性以及病人预后

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

国际医学放射学杂志 2015年第5期 468-468页

作者： B.l.Niell d.Bennett A.sharma G.s.Gazelle 马菊香 department of Radiology Massachusetts General HospitalHarvard Medical SchoolAvon Comprehensive Breast Evaluation Center

摘要目的探讨乳腺MRI检查时乳腺外病变的检出率,对每个检出病变行进一步影像评估的建议及其对病人预后和医疗保健支出的影响。材料与方法本研究经伦理审查委员会批准并免除知情同意书。回顾性分析2010年1月1日—2010年12月31日本机构共2... 详细信息

摘要目的探讨乳腺MRI检查时乳腺外病变的检出率,对每个检出病变行进一步影像评估的建议及其对病人预后和医疗保健支出的影响。材料与方法本研究经伦理审查委员会批准并免除知情同意书。回顾性分析2010年1月1日—2010年12月31日本机构共2 324例女性乳腺MRI检

关键词：乳腺外 MRI 病变病人预后