Results 11 to 20 of about 21,897 (163)

Plant economics traits predict plant carbon allocation and responsiveness to arbuscular mycorrhizal fungi under varying precipitation

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Most terrestrial plant species form symbioses with arbuscular mycorrhizal fungi (AMF). However, the below‐ground carbon (C) allocation of plants and the nutritional and growth benefits provided by AMF within this symbiosis vary greatly across species and environments ...
Hengjun Zhao   +3 more
wiley   +1 more source

钻孔应变数据的环境响应去除与震前异常提取

open access: yesDizhen xuebao
基于四川省姑咱台的钻孔应变观测数据,研究了2013年4月芦山MS7.0地震的应变异常。首先通过时间序列分解法去除芦山地震前后(2011年1月至2014年1月)观测数据的长期背景趋势和周期趋势,其次采用多通道奇异谱分析法分解数据,去除水位和气压引起的应变响应,最后提取应变数据中的震前负熵异常。结果表明:水位与水位应变响应的相关系数为−0.97;有96.1%天的日气压与其应变响应的相关系数的绝对值大于0.9,验证了本文环境响应去除算法的有效性;负熵异常累积与贝尼奥夫应变累积的一致性表明,震前4 ...
Kaiguang Zhu   +7 more
doaj   +1 more source

Evaluation of PI Research Management Mode by Delphi Method [PDF]

open access: yes, 2017
目的运用德尔菲法对PI制科研管理模式的影响因素进行分析,初步确定影响PI制科研管理模式的相关因素。方法采用德尔菲法问卷咨询法。结果两轮问卷调查,专家积极系数都为100%,专家权威系数分别为0.80和0.84。第一轮的变异系数为0.11,肯德尔和谐系数为0.78;第二轮变异系数为0.04,肯德尔变异系数为0.89,且两次的检验差异都有统计学意义(P〈0.01)。PI制管理模式影响因素的重要程度依次为PI自主权、稳定的科研经费来源、科研机构学术氛围。结论通过德尔菲法评价影响PI制科研管理相关影响因素 ...
任林琇
core   +1 more source

Flexible parental care in a songbird correlates with sex‐specific responses to seasonal phenology, mating opportunity and reproductive success

open access: yesJournal of Animal Ecology, EarlyView.
This population‐comparative study reveals that male and female parents respond differently to social and ecological conditions. This sex‐specific responsive strategy is related to the incongruent parental care systems across populations in Chinese penduline tits.
Jia Zheng   +5 more
wiley   +1 more source

Evaluation of the Up-to-date Approach SBA for Measurement of Water Leaving Radiance [PDF]

open access: yes, 2015
SBA(Skylight-blockedapproach)是新近提出的直接测量离水辐亮度Lw的方法(Leeetal.,2013)。该测量方法是由表面之上法改进而来。辐亮度光谱仪镜头处安装上一个蔽光元件——遮光锥,测量时遮光锥的末端稍稍插入水中但光谱仪镜头保持在水面之上。如此一来,遮光锥将水面反射的光完全阻挡,来自水中的辐亮度穿过水面后自然转变为Lw并被光谱仪所接收,从而实现了由光学传感器直接获得Lw的突破。传统的测量方法,包括剖面法和表面之上法,只能测量相关参数,然后通过物理模型计算得到Lw。然而 ...
陈旭磊
core  

Looking at Us Through Their Eyes. The Analytical Process from Ethnographic Perspectives1

open access: yesJournal of Analytical Psychology, EarlyView.
Abstract This article looks at the analytical situation through the Others’ eyes—through examples from contemporary ethnographies of foreign cultures. It discusses the following issues: a) The analogy between the ontological worlds of the dead, ghosts, animals and dreams in “primitive populations” and the analytical psychological descriptions of the ...
Stefano Carta
wiley   +1 more source

Preparation and Characterization of Anti-Neuropilin2 Monoclonal Antibody and Its Preliminary Application [PDF]

open access: yes, 2016
研究背景和目的 Neuropilin2(NRP2)是一种多功能的新型受体,在神经系统发育、心血管系统、免疫系统及淋巴管生成等过程中发挥重要作用。最新研究表明,NRP2受体广泛表达于肿瘤细胞表面,与肿瘤血管形成以及肿瘤的发生发展、凋亡、粘附、侵袭和转移等生物学行为密切相关。多种肿瘤细胞均高表达NRP2,提示NRP2可能成为一种新型肿瘤标志物。NRP2通过多种机制调控肿瘤进展,NRP2-b1b2是其发挥作用的重要结构域,NRP2-b1b2结构域可以结合配体Ⅲ型Semaphorin和VEGF ...
杨芸
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

关中平原农田土壤水力参数空间分异与模拟

open access: yesShuitu Baochi Xuebao, 2021
土壤水力参数是土壤水分和污染物迁移等陆面过程数值模拟的重要基础参数。为探明关中平原农田土壤水力参数空间分异特征,建立空间分布预测模型,在关中平原网格布设124个样点,采集根层0-20 cm原状和扰动土壤样品,利用van Genuchten模型拟合获取土壤水分特征曲线,获得残余含水量(θr)、饱和含水量(θs)以及系数α和n等土壤水力参数。采用经典统计学、地统计学和结构方程方法分析了θr、θs、α和n的空间变异特征及影响因子,建立了水力参数传递函数预测模型。结果表明:θr和α为强变异,θs为中等变异 ...
牛晓倩   +4 more
doaj  

Preparation and Preliminary application of Dextran Quantitative Detection Kit [PDF]

open access: yes, 2016
右旋糖酐(Dextran),又名葡聚糖,由Leuconostocmesenteroides等微生物产生的酶聚合葡萄糖而成或葡萄糖通过化学聚合而成。右旋糖酐广泛应用于医药、食品、化工等领域。在医学领域的应用主要包括:作为血浆体积扩张剂,作为抗凝剂,以及作为渗透压调节剂用于相关的疾病治疗。一般机体组织细胞并不能直接利用右旋糖酐,主要从尿液排出,右旋糖酐使用过量会引起急性肾衰竭、充血性心衰竭、肺水肿及血小板减少等毒副作用。因此,监测血液、尿液的右旋糖酐含量是指导右旋糖酐用量的重要指标 ...
王生育
core  

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