检索结果-南通市图书馆

Nitrate reductase activity in high-mountain plants:a test across species,growth form and habitat type

Journal of Plant Ecology 2019年第3期12卷 519-530页

作者： Adam Rajsz Bronisław Wojtuń Lucyna Mróz ludwik żołnierz Alexander J.Kempers Department of Ecology Biogeochemistry and Environmental ProtectionWrocław Universityul.Kanonia 6/850-328 WrocławPoland Department of Botany and Plant Ecology University of Environmental and Life Sciences.Pl.Grunwaldzki 24a50-363 WrocławPoland Radboud University Nijmegen Institute for Water and Wetland ResearchDepartment of Environmental ScienceHeyendaalseweg 1356525 AJ NijmegenThe Netherlands

Aims For many terrestrial plants,nitrate is the most important form of available soil nitrogen for ***,many plant species,which grow on acidic,ammonium-dominated soils,exhibit a con-stantly low level of nitrate reductase activity(NRA).Little is known about NRA in high-mountain vascular plants in similar *** tested the hypothesis that high-mountain vascular plants in acidic and ammonium-dominated habitats have low levels of *** Twenty-six plant species of the families Asteraceae,Ericaceae,Poaceae,Polygonaceae,Salicaceae,Pinaceae,Ranunculaceae,Woodsiaceae,Cyperaceae,Juncaceae,Rosaceae and Urticaceae representing different growth forms were investigated in seven native and anthropogenic habitats of subalpine and alpine belts of the Karkonosze(Hercynian middle-mountains,Central Europe),with respect to leaf NRA and mineral nitrogen forms in *** was measured by an in vivo assay for the first time directly in the field using portable water *** Findings An NRA study of vascular plants from high mountains is presented for the first time,and most of the studied subalpine and alpine species were subjected to field measurements for the first time *** among species,families,growth forms and habitats for NRA were *** differences reflected mainly the taxonomical position and in part ecological *** analysis confirmed that variance component showed that enzyme activities were mostly explained by plant species and ***,the subalpine and alpine species from their native habitats are characterized by very low and low ability for nitrate *** also compared NRA with Ellenberg’s N val-ues for the studied *** a regression equation,N values of some species were calculated for the first time and corrected for the others.

关键词： nitrate reductase subalpine and alpine habitats Ellenberg's N values the Karkonosze Hercynian middle-mountains

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

The quantity of sand fraction sediment in reservoirs as the basis of an assessment of the bedload transport from a reservoir catchment

引用

International Journal of Sediment Research 2018年第4期33卷 385-394页

作者： Szczepan ludwik Dabkowski Lukasz Bak Department of Water Quality Institute of Technology and Life Sciences Department of Geotechnics Geomatics and Waste Management Kielce University of Technology

A knowledge of the quantity of the sand fraction in the sediments deposited in reservoirs makes it easier to determine the bedload transport, which is a rarely measured parameter. The current study discusses the results of investigations into the siltation and physical properties of sediment in two small reservoirs located in the southeastern part of Poland. Also, the quantity of the bedload sand fraction was *** estimation of the reservoir capacity loss after t years of operation was based on hydroacoustic measurements. The sediment density, organic matter content, and granulometric composition were evaluated by means of investigations and analyses of bottom sediment core samples. The interpolation of the parameters describing the sediment properties was done using the Kriging method. The analyses indicate that 10.80 thousand m3of sediment were deposited into the Zalew Kielecki Reservoir in the years 2004-2015. Their overall mass was 7320 t, of which sand fraction sediments constituted 39.7%.Between the years 2004 and 2014, the Umer Reservoir retained 11.79 thousand m3of sediment having a mass of 7200 t, of which sand fraction constituted 34.6%.

关键词： Reservoir Sedimentation Bottom sediment properties Bedload transport Bathymetry

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Multi-institutional analysis of independent predictors for burn mortality in the United States

引用

Burns & Trauma 2018年第3期6卷 199-208页

作者： Dmitry Zavlin Vishwanath Chegireddy Stefanos Boukovalas Anna M.Nia ludwik K.Branski Jeffrey D.Friedman Anthony Echo Institute for Reconstructive Surgery Houston Methodist HospitalWeill Cornell Medicine6560 Fannin StreetScurlock TowerSuite 2200HoustonTX 77030USA Division of Plastic Surgery The University of Texas Medical BranchGalvestonTXUSA.3School of MedicineThe University of Texas Medical BranchGalvestonTXUSA

Background:Previous reports individually identified different factors that predict death after burns. The authors employed the multi-center American Burn Association's (ABA) National Burn Repository (NBR) to elucidate which parameters have the highest negative impact on burn mortality. Methods:We audited data from the NBR v8.0 for the years 2002–2011 and included 137,061 patients in our study. The cases were stratified into two cohorts based on the primary outcome of death/survival and then evaluated for demographic data, intraoperative details, and their morbidity after admission. A multivariable regression analysis aimed to identify independent risk factors associated with mortality. Results:A total of 3.3%of patients in this analysis did not survive their burn injuries. of those, 52.0%expired within 7 days after admission. Patients in the mortality cohort were of older age (pore frequently female (pore pre-existing comorbidities (potal body surface area (TBSA), inhalation injury, hospitalization time, and occurrence of complications were higher compared to survivors (pof insurance (odds ratio (oR)=1.84, confidence interval (CI) 1.38–2.46), diabetes (oR=1.24, CI 1.01–1.53), any complication (oR=4.09, CI 3.27–5.12), inhalation injury (oR=3.84, CI 3.38–4.36), and the need for operative procedures (oR=2.60, CI 2.20–3.08) were the strongest independent contributors to mortality after burns (poR=1.07, CI 1.06–1.07) and TBSA (oR=1.09, CI 1.09–1.09) were significant on a continuous scale (poverall comorbidities were not a statistical risk factor. Conclusion:Uninsured status, inhalation injury, in-hospital complications, and operative procedures were the strongest mortality predictors after burns. Since most fatal outcomes (52.0%) occur within 7 days after injury, physicians and medical staff need to be aware of these risk factors upon patient admission to a burn center.

关键词： Burns Mortality Death Risks outcomes

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

癌与慢病毒病的一些共同特征

引用

国外医学(微生物学分册) 1980年第4期 176-177页

作者： ludwik G 王浩

目前,实验证据已能说明动物大多数恶性肿瘤及白血病和淋巴瘤是由传播性致瘤病毒引起的。这些病毒广泛分布于各种动物,也很可能在人身上。它们要求条件适中,对宿主并不造成损害。但在各种代谢、激素、化学因素及电离幅射的击发下会变为... 详细信息

目前,实验证据已能说明动物大多数恶性肿瘤及白血病和淋巴瘤是由传播性致瘤病毒引起的。这些病毒广泛分布于各种动物,也很可能在人身上。它们要求条件适中,对宿主并不造成损害。但在各种代谢、激素、化学因素及电离幅射的击发下会变为致病性的,并引起宿主发生恶性肿瘤或者白血病。致瘤病毒可能代表了一种很长时间的潜在感染,病毒代代相传已达几百年,除非偶尔在一种宿主身上引起癌或白血病,否则病毒的存在是不被人注意的。虽然至今仍没有病毒引起肿瘤和白血病的实验根据,但推断病毒引起的肿瘤性疾病不但能发生在动物也

关键词：共同特征慢病毒白血病老年性痴呆库鲁病逆转录病毒血癌病毒颗粒

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

氢化物发生火焰原子吸收分光光度法测定硅酸盐岩石和硫化矿石中的锗

引用

地球与环境 1988年第6期 64-66页

作者： ludwik Halicz ,余泽宇四川煤田地质研究所

本研究的目的是建立合适的溶解方法,确定有效还原锗离子的最佳条件和消除测定锗中的种种干扰的措施。实验部分仪器氢化物的连续发生用四通道蠕动泵中的两个通道来完成。样品溶液和四氢硼(Ⅲ)钠试剂

关键词：氢化物氢化合物硅酸盐岩石氢氟酸氟化物缓冲溶液盐酸浓度硫化矿石样品溶液

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

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：