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Three-dimensional niche partitioning between two colonially nesting ardeid species in central China

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Avian Research 2021年第3期12卷 338-345页

作者： Yuanxing Ye Canshi hu Yiting Jiang Geoffrey W.h.davison Changqing Ding School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China College of Life Science Guizhou UniversityGui-yang 550025China Department of Life Science Liaoning UniversityShenyang 110036China National Biodiversity Centre National Parks BoardSingapore 259569Singapore

Background:Interspecific competition is known to be strongest between those species that are both closely related and *** are colonially nesting wetland birds that often overlap and can therefore be expected to compete in roosting and nesting habitat as well as in *** to the niche partitioning hypothesis,it is to be expected that these similar species would show differentiation in at least one of the main niche dimensions to reduce *** tested niche partitioning between the colonially nesting Little Egret(Egretta garzetta)and Cattle Egret(Bubulcus ibis)in temporal,spatial and trophic ***:Field study was conducted in three mixed egret colonies in Yangxian County,southwest Shaanxi Prov-ince,central *** each nest colony we recorded its spatial location,the height of nesting trees and of nests,the height of roosting trees and of roosting individuals within the *** determined the first egg-laying and first hatching dates of the two *** dissection of storm-killed egret nestlings was used to measure the *** transects were surveyed to study foraging habitat ***:We found that hatching time of Little Egrets peaked earlier(by about 1 month)than that of Cattle *** Egrets nested and roosted higher than Little *** foraging habitats used by Little Egrets were dominated by river banks(73.49%),followed by paddy fields(13.25%)and reservoirs(10.84%),whereas Cattle Egret foraging sites were characterized by grasslands(44.44%),paddy fields(33.33%)and river banks(22.22%).Little Egrets consumed more fishes(65.66%)and Odonata larvae(13.69%)than Cattle Egrets,while Cattle Egrets were found feeding mainly on Coleoptera(29.69%)and Orthoptera(23.29%).Little Egrets preyed on larger mean biomasses of food items than Cattle ***:Our results confirm the niche partitioning hypothesis as a mechanism for coexistence among ecologi-cally similar *** two coexisting egret species,

关键词： Bubulcus ibis Egretta garzetta Interspecific competition Niche partition Sympatric species

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Metabolomic studies in the inborn error of metabolism alkaptonuria reveal new biotransformations in tyrosine metabolism

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Genes & Diseases 2022年第4期9卷 1129-1142页

作者： Brendan P.Norman Andrew S.davison Juliette h.hughes hazel Sutherland Peter J.M.Wilson Neil G.Berry Andrew T.hughes Anna M.Milan Jonathan C.Jarvis Norman B.Roberts Lakshminarayan R.Ranganath George Bou-Gharios James A.Gallagher Institute of Life Course and Medical Sciences University of LiverpoolWilliam Henry Duncan Building6 West Derby StreetLiverpoolL78TXUK Department of Clinical Biochemistry&Metabolic Medicine Liverpool Clinical LaboratoriesRoyal Liverpool University HospitalPrescot StreetLiverpoolL78XPUK School of Sport&Exercise Sciences Liverpool John Moores UniversityTom Reilly BuildingByrom StreetLiverpoolL33AFUK Department of Chemistry University of LiverpoolCrown StreetLiverpoolL697ZDUK

Alkaptonuria (AKU) is an inherited disorder of tyrosine metabolism caused by lack of active enzyme homogentisate 1,2-dioxygenase (hGD). The primary consequence of hGD deficiency is increased circulating homogentisic acid (hGA), the main agent in the pathology of AKU disease. here we report the first metabolomic analysis of AKU homozygous hgd knockout (hgd−/−) mice to model the wider metabolic effects of hgd deletion and the implication for AKU in humans. Untargeted metabolic profiling was performed on urine from hgd−/− AKU (n = 15) and hgd+/− non-AKU control (n = 14) mice by liquid chromatography high-resolution time-of-flight mass spectrometry (Experiment 1). The metabolites showing alteration in hgd−/− were further investigated in AKU mice (n = 18) and patients from the UK National AKU Centre (n = 25) at baseline and after treatment with the hGA-lowering agent nitisinone (Experiment 2). A metabolic flux experiment was carried out after administration of 13C-labelled hGA to hgd−/−(n = 4) and hgd+/−(n = 4) mice (Experiment 3) to confirm direct association with hGA. hgd−/− mice showed the expected increase in hGA, together with unexpected alterations in tyrosine, purine and TCA-cycle pathways. Metabolites with the greatest abundance increases in hgd−/− were hGA and previously unreported sulfate and glucuronide hGA conjugates, these were decreased in mice and patients on nitisinone and shown to be products from hGA by the 13C-labelled hGA tracer. Our findings reveal that increased hGA in AKU undergoes further metabolism by mainly phase II biotransformations. The data advance our understanding of overall tyrosine metabolism, demonstrating how specific metabolic conditions can elucidate hitherto undiscovered pathways in biochemistry and metabolism.

关键词： Alkaptonuria Biotransformation Metabolism Metabolomics Mice

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野外岩石鉴定法第1版

1950年

作者： E.h.davison 郝颐寿译

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野外矿物鉴定法第4版

野外矿物鉴定法第4版

Tianjinese Tone Sandhi in Action:A Role for Stress & Metrics in Mandarin

1953年

作者： E.h.davison原龚念祖刘树汉译

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Tianjinese Tone Sandhi in Action:A Role for Stress & Metrics...

第六届全国现代语音学学术会议

作者： Deborah S.davison Stanford University USA

In this paper I present evidence from read speech by a Tianjin native to show that Tianjin Mandarin tone sandhi does not apply systematically in four environments: 1) under emphatic stress on both syllables of a disyllabic word, in which case both underlying tone values surface;2) post and pre-accentually in small phrases, in which case neither sandhi nor underlying tone values surface, all syllables being uttered with a uniformly flat low register pitch;3) under emphatic stress on the rightmost tone sandhi trigger syllable, in which case the preceding target syllable may undergo anticipatory co-articulation instead of receiving its tone sandhi value;and 4) under emphatic stress on the leftmost target tone saadhi syllable, in which case the following trigger syllable loses its tone via 2). I suggest that Tianjin tone sandhi changes disyllabic contours so as isolate a h tone at the syllable-internal boundary between the two syllables, the h constrained to being realized on first or second syllable dependent on preserving tonemic structure of the rightmost trigger syllable. The h tone at mis position thus serves to identify words and phrases which are within the portion of an utterance that is broadly focused, as opposed to being either emphasized or de-emphasized as in 1-4 above. This discourse function is similar to that of syllables marked to receive lexical and phrasal in English and other non-tonal lexical stress languages.

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从瓦解到新生

作者： R.h.·戴维森(Roderic h. davison)

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土的连续加荷固结试验

地质科学译丛 1991年第4期8卷 77-82,100页

作者： L.R.davison J.h.Atkinson 朱培红

在1975年,英国1377规范中所指定的常规固结试验较简单而且较粗略,该试验是以增量的方式施加荷载,同时只能求取少量与土的压缩或固结或前期固结压力(屈服压力)有关的参数。连续加荷固结试验能够测出压缩和固结参数的变化规律,同时可以更... 详细信息

在1975年,英国1377规范中所指定的常规固结试验较简单而且较粗略,该试验是以增量的方式施加荷载,同时只能求取少量与土的压缩或固结或前期固结压力(屈服压力)有关的参数。连续加荷固结试验能够测出压缩和固结参数的变化规律,同时可以更准确地确定前期固结压力的大小。由于应力路径试验中的数据采集和控制系统已经应用于固结试验之中,现在已可以普遍采用连续加荷试验,而且还加快了试验资料的分析过程,对重塑样进行的试验结果表明测量参数的大小并非完全取决于试验类型。

关键词：土加荷固结试验

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腭扁桃体鳞状细胞癌:FDG标准摄取值比率作为生物标志物对扁桃体癌与生理摄取的鉴别价值

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国际医学放射学杂志 2010年第4期 377-378页

作者： J.M.davison A.Ozonoff h.M.Imsande G.A.Grillone R.M.Subramaniam 庞国栋 Department of Radiology Boston University School of Medicine820 Harrison AveFGH BuildingLevel3BostonMA02118

目的通过测量腭扁桃体18F-FDG的摄取量,确定一个敏感的、特异的度量标准,从而鉴别生理性非对称摄取量与鳞状细胞癌(SCC)的摄取量。材料与方法本组回顾性研究遵守hIPAA,经制度评审

关键词：腭扁桃体扁桃体癌鳞状细胞癌 FDG

抑制马铃薯无性系植株病毒的积累减少马铃薯卷叶病毒病的传播

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园艺与种苗 1993年第5期 45-49页

作者： h.Barker A.T.Woodford 辛爱梅

在培育抗病毒品种的工作中,抗侵染是最常选择的特性。事实上,马铃薯抗卷叶病毒(PLRV)病的育种,这一仔细考虑的选择可能是抗性的唯一类型(davison,1973),而其他类型大多被忽视。近年的研究表明,一些马铃薯无性系和栽培品种对PLRV的抗性... 详细信息

在培育抗病毒品种的工作中,抗侵染是最常选择的特性。事实上,马铃薯抗卷叶病毒(PLRV)病的育种,这一仔细考虑的选择可能是抗性的唯一类型(davison,1973),而其他类型大多被忽视。近年的研究表明,一些马铃薯无性系和栽培品种对PLRV的抗性至少有8个组成部分(Barker等,1985,1986;

关键词：源株无性系无性繁殖系品系(育种) 茄属马铃薯土豆侵染率蚜虫种群植株叶片毒株