检索结果-南通市图书馆

Community phylogenetic diversity and abiotic site characteristics influence abundance of the invasive plant Rhamnus cathartica L.

引用

Journal of Plant Ecology 2014年第2期7卷 202-209页

作者： Timothy J.s.Whitfeld Alexandra G.Lodge Alexander m.Roth Peter B.Reich Department of Forest Resources University of Minnesota1530 Cleveland Avenue NorthSt PaulMN 55108-6112USA Hawkesbury Institute for the Environment University of Western SydneyPenrithNSW 2751Australia

Aims Theory predicts that the success of introduced species is related to the diversity of native species through trait-based *** site characteristics may also affect a site’s susceptibility to *** quantified resident plant species richness,phylogenetic diversity and several abiotic site characteristics for 24 oak forests in minnesota,UsA,to assess their impact on the abundance of a widespread,introduced terrestrial plant species,common buckthorn(Rhamnus cathartica L.).specifically,we asked(1)whether resident species richness and phylogenetic diversity affected the abundance of *** and(2)what site characteristics explained the overall abundance of *** Our survey included 24 oak-dominated stands in minnesota’s deciduous *** each stand,we identified all species in 16 *** also measured a series of environmental site characteristics,including canopy openness(a proxy for light availability),percent bare soil,soil pH,percent sand,an index of propagule availability,duff layer thickness(a proxy for earthworm activity),an index of insolation and *** all species present in at least one site,we estimated a community *** combined all sitelevel characteristics,including phylogenetic diversity of the resident plant species,in a multiple regression model to examine site-level drivers of community *** Findings Results indicate that sites with higher overall plant phylogenetic diversity harbor less ***,even though native species richness was not significantly related to *** *** analyses indicated that,in addition to resident species phylogenetic diversity,the most important predictors of *** abundance were canopy openness and the amount of bare soil,both positively related to the abundance of the *** combining the effects of abiotic site characteristics and resident species phylogenetic diversity in a model that predicted the abundance of R

关键词： invasibility R.cathartica L. phylogenetic diversity site characteristics

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

Characterization and beneficiation of the Egyptian black shale for possible extraction of organic matter

引用

International Journal of mining science and Technology 2014年第2期24卷 177-182页

作者： Abd El-Rahiem F.H. Hassan m.s. selim K.A. Abdel-Khalek N.A. Central metallurgical Research and Development Institute

The present paper focuses on obtaining concentrate enriched with organic matter that could be suitable for a retorting process from black shale; this is black shale from the safaga area on the Red sea Coast. X-ray diffraction and optical polarising microscope are used in evaluating black shale minerals. Attrition scrubbing and flotation were conducted for enrichment of organic matter in the black shale sample. mineralogical studies revealed that black shale samples contain bituminous calcareous clay stone, quartz, apatite and pyrite. Rabah mine black shale contains 28% organic matter. The results of the different separation techniques indicate that attrition and flotation techniques successively enriched the organic matter in the black shale. The organic matter could be enriched in the black shale and obtained a concen- trate with 59% assavinz and 85% recovery.

关键词： Black shale Kerogen Organic matter Attrition scrubbing Flotation

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

Influence of Angiotensin II on α<sub>1sub>-Adrenergic Receptors Function in Rat Aorta and Expression in Vascular smooth muscle Cells

引用

Journal of Biosciences and medicines 2024年第4期12卷 123-134页

作者： Itzell Alejandrina Gallardo-Ortíz Juan Pablo de Jesús Benítez-Garrido santiago C. sigrist-Flores Juan Javier López-Guerrero Enrique Hong Rafael Villalobos-molina Unidad de Biomedicina Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Carrera de Enfermerí a Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Departamento de Farmacobiologí a Centro de Investigaci&#243n and de Estudios Avanzados-IPN Ciudad de M&#233xico M&#233xico Carrera de mé dico Cirujano Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico

Angiotensin II (Ang II) is the main mediator of the Renin-Angiotensin-system acting on AT1 and other AT receptors. It is regarded as a pleiotropic agent that induces many actions, including functioning as a growth fac... 详细信息

Angiotensin II (Ang II) is the main mediator of the Renin-Angiotensin-system acting on ATsub>1sub> and other AT receptors. It is regarded as a pleiotropic agent that induces many actions, including functioning as a growth factor, and as a contractile hormone, among others. The aim of this work was to examine the impact of Ang II on the expression and function of αsub>1sub>-adrenergic receptors (αsub>1sub>-ARs) in cultured rat aorta, and aorta-derived smooth muscle cells. Isolated Wistar rat aorta was incubated for 24 h in DmEm at 37˚C, then subjected to isometric tension and to the action of added norepinephrine, in concentration-response curves. Ang II was added (1 × 10sup>−5sup> m), and in some experiments, 5-methylurapidil (αsub>1Asub>-AR antagonist), AH11110A (αsub>1Bsub>-AR antagonist), or BmY-7378 (αsub>1Dsub>-AR antagonist), were used to identify the αsub>1sub>-AR involved in the response. Desensitization of the contractile response to norepinephrine was observed due to incubation time, and by the Ang II action. αsub>1Dsub>-AR was protected from desensitization by BmY-7378;while Rs-100329 and prazosin partially mitigated desensitization. In another set of experiments, isolated aorta-derived smooth muscle cells were exposed to Ang II and αsub>1sub>-ARs proteins were evaluated. αsub>1Dsub>-AR increased at 30 and 60 min post Ang II exposure, the αsub>1Asub>-AR diminished from 1 to 4 h, while αsub>1Bsub>-AR remained unchanged over 24 h of Ang II exposure. Ang II induced an increase of αsub>1Dsub>-AR at short times, and BmY-7378 protected αsub>1Dsub>-AR from desensitization.

关键词： Angiotensin II α1D-AR α1-AR Expression Rat aorta smooth muscle Cells

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

Cathepsin B antisense oligodeoxynucleotide suppresses invasive potential of mG-63 cells

引用

Journal of Pharmaceutical Analysis 2008年第2期20卷 100-103,118页

作者： He m. Xiao Z. Li s. Chen A. Department of spinal surgery Guangxi Medical University Nanning 530021 China Department of Orthopaedics Tongji Hospital Tongji Medical College Wuhan 430030 China

Objective To study the biological effects of cathepsin B phosporothioated antisense oligodeoxynucleotide on human osteosarcoma cell line mG-63 after *** A 18-mer phosphorothioate antisense oligodeoxynucleotide(AsODN)targeted against the cathepsin B mRNA was transfected into the human osteosarcoma cell line mG-63 by lipofectamine *** sense and nonsense oligodeoxynucleotides to cathepsin B and blank vector were used as *** expression of cathepsin B mRNA was examined by RT-PCR an...

关键词： Antisense oligodeoxynucleotide Cathepsin B Invasion RT-PCR

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

Ameliorative effects of melatonin and zinc oxide nanoparticles treatment against adverse effects of busulfan induced infertility in male albino mice

引用

BIOCELL 2022年第2期46卷 535-545页

作者： AmOURA m.ABOU-EL-NAGA sHAKER A.mOUsA FAYEZ ALTHOBAITI EmAN FAYAD ENGY s.FAHIm Department of Zoology Faculty of ScienceMansoura UniversityMansouraEgypt The Pharmaceutical Research Institute Albany College of Pharmacy and Health SciencesRensselaerUSA Department of Biotechnology Faculty of SciencesTaif UniversityTaifSaudi Arabia

Testicular damage is one of the most hazardous effects as it’s associated with ***(Bu)is a highly toxic chemotherapeutic drug that affects *** male swiss albino mice divided into six groups of 5 animals ***(oral 0.9%saline daily for 75 days);mel(20 mg/kg/day orally for 30 days);ZnO NPs(5 mg/kg/day *** 30 days);BU(single *** of 40 mg/kg and then left for 45 days);BU+mel(single 40 mg/kg dose of BU and left for 45 days followed by 20 mg/kg/day mel for 30 days);BU+ZnO NPs(single dose of 40 mg/kg of BU and left for 45 days,then 5 mg/kg/day ZnO NPs for 30 days).Preparation and Characterization of ZnO *** from testis prepared for ultrastructural investigations using TEm after masson’s trichrome and toluidine blue *** induced histological and ultrastructural damage of the ***,the present results could be concluded that mel or ZnO NPs can protect the testicular tissue against ultrastructural alterations induced by BU by its antioxidant and anti-apoptotic effects.

关键词： Busulfan melatonin Zinc oxide nanoparticles Ultrastructure Testis mice

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

INTERLAYER COUPLING AND FERROmAGNETIC REsONANCE IN Fe-si/Cr mULTILAYERs

引用

Acta metallurgica sinica(English Letters) 1996年第4期9卷 283-286页

作者： s.s.Yan: YH Liu: X.D ma,Ym. Zhang and L.m mei(Department of physics, shandong University, Jinan 250100, China )

Fe-si/Cr multilayers with amorphous Fe-si magnetic layers and Cr nonmagnetic layers were prepared by an rf-sputtering *** the thickness of the Cr layers varies from 0.5 to 6 nm, the interlayer coupling oscillates periodically from ferromagnetic to antiferromagnetism. For each sample only one wide uniform resonance peak is detected by the ferromagnetic resonance. The uniform resonance field Hb and the resonance line width △H_b oscillate periodically as the thickness of the Cr layers increases, which is related to the oscillation of the interlayer coupling from ferromagnetic to *** oscillation period is about 1.5nm.

关键词： multilayer interlayer coupling ferromagnetic resonance

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

Association between admission haematocrit and mortality among men with acute ischaemic stroke

引用

stroke & Vascular Neurology 2018年第3期3卷 160-168页

作者： Jason J sico Laura J myers Brenda J Fenton John Concato Linda s Williams Dawn m Bravata Neurology service VA Connecticut Healthcare SystemWest HavenConnecticutUSA Department of Neurology Center for NeuroEpidemiological and Clinical Neurological ResearchYale University School of MedicineNew HavenConnecticutUSA Department of Internal medicine Yale University School of MedicineNew HavenConnecticutUSA Clinical Epidemiology Research Center(CERC) VA Connecticut Healthcare SystemWest HavenConnecticutUSA Pain Research InformaticsMultimorbidities and Education(PRIME)Center of InnovationVA Connecticut Healthcare SystemWest HavenConnecticutUSA Communication and the HsR&D stroke Quality Enhancement Research Initiative(QUERI) Richard L Roudebush VA Medical CenterIndianapolisIndianaUSA VA Health services Research and Development(HsR&D) Center for Healthcare InformaticsRichard L Roudebush VA Medical CenterIndianapolisIndianaUSA Division of Chronic Disease Epidemiology Yale School of Public HealthWest HavenConnecticutUSA medical service VA Connecticut Healthcare SystemWest HavenConnecticutUSA Regenstrief Institute IndianapolisIndianaUSA Department of Neurology Indiana University School of MedicineIndianapolisIndianaUSA Department of Internal medicine Indiana University School of MedicineIndianapolisIndianaUSA

Objective Anaemia is associated with higher mortality among patients with non-stroke cardiovascular conditions;less is known regarding the relationship between anaemia and mortality among patients with acute ischaemic *** medical records were abstracted for n=3965 veterans from 131 Veterans Health Administration facilities who were admitted with ischaemic stroke in fiscal year *** values within 24 hours of admission were classified as≤27%,28%-32%,33%-37%,38%-42%,43%-47% or≥48%.multivariate logistic regression was used to examine the relationship between anaemia and in-hospital,30-day,6-month and 1-year mortality,adjusting for age,medical comorbidities,modified Acute Physiology and Chronic Health Evaluation-III and stroke *** factors were calculated to standardise comparisons between haematocrit tier and other *** Among n=3750 patients included in the analysis,the haematocrit values were≤27%in 2.1%(n=78),28%-32% in 6.2%(n=234),33%-37%in 17.9%(n=670),38%-42% in 36.4%(n=1366),43%-47% in 28.2%(n=1059)and≥48% in 9.1%(n=343).Patients with haematocrit≤27%,compared with patients in the 38%-42% range,were more likely to have died across all follow-up intervals,with statistically significant adjusted ORs(aORs)ranging from 2.5 to *** with polycythaemia(ie,haematocrit≥48%)were at increased risk of in-hospital mortality(aOR=2.9;95%CI 1.4 to 6.0),compared with patients with mid-range admission *** differences between patients receiving and not receiving blood transfusion limited our ability to perform a propensity *** factors in the 1-year mortality model were 0.46(severe anaemia),0.06(cancer)and 0.018(heart disease).Conclusions Anaemia is independently associated with an increased risk of death throughout the first year post stroke;high haematocrit is associated with early poststroke *** anaemia is associated with 1-year mortality to a greater degree than cancer or heart dise

关键词： mortality admitted transfusion

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

Anodic oxidation of formic acid on PdAuIr /C-sb2O5·snO2 electrocatalysts prepared by borohydride reduction

引用

燃料化学学报 2014年第7期42卷 851-857页

作者： A. O. Neto J. Nandenha R. F. B. De souza G. s Buzzo J. C. m . silva E. V. spinacé m . H. m . T. Assumpo Instituto de Pesquisas Energeticas e Nucleares-IPEN-CNEN/sP Cidade UniversitCtria Sao Paulo 05508-900 Brazil

PdAuIr/C-sb2O5·snO2electrocatalysts with Pd∶Au∶Ir molar ratios of 90∶5∶5,70∶20∶10 and 50∶45∶5 were prepared by borohydride reduction *** electrocatalysts were characterized by EDX,X-ray diffraction,transmission electron microscopy and the catalytic activity toward formic acid electro-oxidation in acid medium investigated by cyclic voltammetry(CV),chroamperometry(CA)and tests on direct formic acid fuel cell(DFAFC)at 100℃.X-ray diffractograms of PdAuIr/C-sb2O5·snO2electrocatalysts showed the presence of Pd fcc phase,Pd-Au fcc alloys,carbon and ATO phases,while Ir phases were not *** micrographs and histograms indicated that the nanoparticles were not well dispersed on the support and some *** cyclic voltammetry and chroamperometry studies showed that PdAuIr/C-sb2O5·snO2(50∶45∶5)had superior performance toward formic acid electro-oxidation at 25℃compared to PdAuIr/C-sb2O5·snO2(70∶20∶10),PdAuIr/C-sb2O5·snO2(90∶5∶5)and Pd/C-sb2O5·*** experiments in a single DFAFC also showed that all PdAuIr/C-sb2O5·snO2electrocatalysts exhibited higher performance for formic acid oxidation in comparison with Pd/C-sb2O5·snO2electrocatalysts,however PdAuIr/C-sb2O5·snO2(90∶5∶5)had superior *** results indicated that the addition of Au and Ir to Pd favor the electro-oxidation of formic acid,which could be attributed to the bifunctional mechanism(the presence of ATO,Au and Ir oxides species)associated to the electronic effect(Pd-Au fcc alloys).

关键词： PdAuIr/C—sb2O5·snO2 甲酸氧化燃料电池电力

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

mechanical and wear behaviour of mg-siC-Gr hybrid composites

引用

Journal of magnesium and Alloys 2016年第3期4卷 197-206页

作者： K.soorya Prakash P.Balasundar s.Nagaraja P.m.Gopal V.Kavimani department of mechanical engineering anna university regional campuscoimbatore-641046tamil naduindia department of mechanical engineering rajalakshmi institute of technologychennai-600124tamil naduindia department of mechanical engineering sns college of engineeringcoimbatore-641107tamil naduindia

The present research deals with development and characterisation of magnesium–siC–Gr hybrid composites through powder metallurgy *** analysis of the magnesium and reinforcement powder particles has been carried out using particle size analyser(PsA)and X-ray diffraction(XRD),and then the mixed powders were analysed through scanning electron microscope(sEm).The developed composite exhibit increased hardness when compared to base material,which could be attributed to the presence of hard ***,a slight decrease in hardness is observed for the hybrid composite when compared to mg–siC composite due to the presence of soft Gr *** tribological properties of the developed composite materials were investigated using pin-on-disc wear test apparatus under dry sliding *** wear resistance of the developed composites improved significantly than that of the magnesium matrix due to the upright effect offered by both of the *** sEm analysis was carried out on the worn out surfaces for better understanding of wear mechanisms.5%Gr reinforced mg-10siC composites confer better wear resistance among the developed composites.

关键词： magnesium Hybrid composites Powder metallurgy sliding wear

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

Basic Principles of mutagenicity Tests for the Detection of Environmental Pollutants with Particular Emphasis on Plant Bioassays

引用

环境与职业医学 2004年第3期21卷 237-242页

作者： s.Knasmüller m.Uhl B.J.majer Institute of Cancer Research Borschkegasse8A1090ViennaAustriaInstitute of Cancer ResearchBorschkegasse8A1090ViennaAustriaInstitute of Cancer ResearchBorschkegasse8A1090ViennaAustria

Genetic toxicology is a multidisciplinary field of research involved in detecting DNA damaging and protective compounds, understanding the biological consequences of DNA damage and their molecular modes of action that... 详细信息

关键词：环境污染物质生物测定变性试验外周环境毒物学

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

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

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：