Results 51 to 60 of about 64,092 (179)

The relationship between the levels of white blood cell and lipopolysaccharide binding protein and intrahepatic triglyceride content , metabolic abnormalities in obese adults [PDF]

open access: yes, 2016
研究目的 非酒精性脂肪性肝病(NAFLD)常常伴随炎性因子的增多,且其发生发展与代谢综合征和胰岛素抵抗紧密相关。本研究针对中心性肥胖人群进行横断面数据分析,探讨白细胞(WBC)及脂多糖结合蛋白水平(LBP)与肝脏脂质含量(IHTC)及其相关代谢异常的关系。 研究方法 本研究纳入485名40-65岁中心性肥胖受试者,进行问卷调查包括病史、生活方式等;测定生化指标并进行胰岛功能评估;通过氢质子磁共振波谱(1H-MRS)技术定量分析肝内甘油三酯含量;进行内脏脂肪含量等测定 ...
孙倩
core  

Comprehensive framework for assessing and optimizing existing research networks

open access: yesConservation Biology, EarlyView.
Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East   +2 more
wiley   +1 more source

Specificity of the Spectrophotometry for Detecting Aminopolyether K2.2.2 in 18F-FDG

open access: yesJournal of Isotopes, 2015
氨基聚醚(K2.2.2)含量是18F-FDG质控中的关键指标,比较了两种常用测量K2.2.2方法的专属性。分别采用分光光度计和半定量TLC 碘显色法测量了14个样品,其中9个阴性样品、2个阳性样品和3个供试品,并与LC-MS/MS测量对比。结果显示:9个阴性样品经分光光度计法测量均为阳性,K2.2.2的测量结果在6.7~470.0 μg/mL;2个阳性样品结果偏高(53,73 μg/mL),3个供试品的K2.2.2含量在14.3~19.2 μg/mL;半定量TLC 碘显色法测量9个阴性样品结果为阴性 ...
ZHANG Jin-ming, ;CHEN Zheng-yu2
doaj   +1 more source

Designed and Implementation of Rolling Resistance Test System [PDF]

open access: yes, 2015
轮胎滚动阻力的测试对于轮胎生产企业以及汽车、摩托车、电动车、轮椅车以及自行车等生产企业来说具有非常重要的意义。本课题设计的是一种基于单片机的滚动阻力测试系统,通过机械结构把滚动阻力转化成重力,再通过称重传感器把重力信号转换成电信号,由单片机进行处理,和上位机通信。从而实现轮胎滚动阻力的测试以及数据分析等等。 本系统集多种测试功能于一体,操作简单、效率高,系统功耗低、使用方便、测量准确性好、重复性好、使用寿命长。在实现基于单片机的滚动阻力测量的基础上,扩展了数据采集,实时监控测试过程,绘制测试波形 ...
苏远锋
core  

Global overview of progress in respecting the contributions of traditional knowledge in biodiversity governance

open access: yesConservation Biology, EarlyView.
Abstract Recognition and engagement of Indigenous Peoples and local communities (IP&LCs) and other traditional knowledge (TK) holders in formal biodiversity governance remain limited, despite their significant contribution to the conservation and sustainable use of biodiversity through their knowledge, innovations, practices, and land stewardship.
Kinga Öllerer   +8 more
wiley   +1 more source

益生菌对菲律宾蛤仔体内全氟辛酸免疫毒性的调节作用研究

open access: yesHaiyang yu huzhao
全氟辛酸(perfluorooctanic acid, PFOA)是一种具有多系统毒性的新污染物,对双壳贝类可产生一定的免疫毒性效应,损害机体的正常免疫功能。益生菌作为一种安全无毒的食品级制剂,已被应用于水产养殖行业,用以提高水生生物的免疫防御能力。然而,益生菌对贝类中新污染物所引发的生物毒性是否有消减作用,目前尚不可知。据前期研究,新污染物PFOA在水生生物尤其贝类中存在较高的蓄积量,具有潜在的生态和健康风险。因此,探索经济贝类中益生菌对PFOA免疫毒性的消减作用具有重要意义 ...
周 扬   +6 more
doaj   +1 more source

开放科研数据的行为影响因素研究* ———以地球科学领域为例 [PDF]

open access: yes, 2019
摘 要: [目的/意义] 开放科研数据面临着科研人员参与度和认同度不高的挑战。文章旨在明确科研人员开放科 研数据的行为影响因素,为各利益相关者更好地激励科研人员参与实践提供参考。 [方法/过程] 研究基于计划行为理论建立模型,探究行为信念、行为态度、主观规范和感知行为控制对地球科学领域科研人员开放科研数据行为的影响; 通过问卷调查收集数据,采用偏最小二乘法结构方程模型 ( PLS-SEM) 工具 SmartPLS3.
包秦雯, 张潇月, 顾立平
core  

Representation of obligate groundwater‐dwelling copepod diversity in European protected areas

open access: yesConservation Biology, EarlyView.
Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli   +7 more
wiley   +1 more source

Indexable Insert Grinding Error Measurement and Compesation Technique [PDF]

open access: yes, 2016
可转位刀片作为可转位刀具的关键切削元件,其制造精度对刀具的加工精度和切削效率有着重要影响。随着先进制造技术的发展,涌现出大量新工艺、新材料的可转位刀片,推动了精密制造的发展进程。目前高档可转位刀片周边数控磨床被国外产品垄断,国内可转位刀片制造技术落后于国外。因此,开展高精、高效可转位刀片刃磨工艺技术研究具有重要意义。 基于以上背景,本论文在项目组前期研究基础上,围绕“可转位刀片磨削误差测量与补偿技术”课题,从以下几个方面展开研究: 1.基于可转位刀片周边磨床特点,重新设计了一种V型块底座 ...
罗琪
core  

Evaluating the empirical basis for threat attribution in the IUCN Red List

open access: yesConservation Biology, EarlyView.
Abstract Understanding the impacts of different threats on species is key to successful conservation interventions and policies. The International Union for Conservation of Nature (IUCN) assesses threats to species, and the organization's Red List of Threatened Species is a key conservation tool.
Ena Humphries   +5 more
wiley   +1 more source

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