共查询到20条相似文献,搜索用时 62 毫秒
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目的通过验证稀有鮈鲫作是否适用于幼体生长试验,为相关化学品测试国家标准的制定提供依据。方法以重铬酸钾和3,4-二氯苯胺为参比物质,按照《OECD化学品测试准则No.215鱼类幼体生长试验》,分别开展三次实验室内稀有鮈鲫幼体生长试验以评价试验结果的重复性,进行实验室间比对试验以评价试验结果的再现性。结果实验室内重复试验中,重铬酸钾和3,4-二氯苯胺对稀有鮈鲫生长抑制效应(EC_(20))平均值分别为30.9 mg/L和163μg/L,变异系数均小于15%;实验室间比对试验中,虽然变异系数增大,但是各实验室的28 d EC_(20)均在【math14】±2s范围之内。结论稀有鮈鲫幼体生长试验结果具有良好的重复性和再现性,且稀有鮈鲫对3,4-二氯苯胺的敏感性与虹鳟(Oncorhynchus mykiss)相当,因此稀有鮈鲫可作为鱼类幼体生长试验的本土受试鱼种。 相似文献
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三氯异氰尿酸和环丙沙星对水生生物的急性毒性 总被引:7,自引:0,他引:7
研究了三氯异氰尿酸(TCCA)和盐酸环丙沙星(CPFX)对小球藻、大型溞和稀有鮈鲫的急性毒性。毒性试验结果表明,TCCA和CPFX对小球藻的96hEC50分别为0.31mg·L-1和20.61mg·L-1、对大型溞48hLC50分别为0.19mg·L-1和135.15mg·L-1,TCCA对稀有鮈鲫96hLC50为1.76为mg·L-1,CPFX对稀有鮈鲫不产生急性毒性。对于TCCA,大型溞最敏感,小球藻次之,稀有鮈鲫最不敏感;对于CPFX,小球藻最敏感,大型溞次之,稀有鮈鲫最不敏感。 相似文献
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抗草鱼出血病病毒转基因稀有(鮈)鲫的初步研究 总被引:2,自引:1,他引:1
研究采用草鱼H1基因启动子,以草鱼呼肠孤病毒(Grass carp reovirus,GCRV)外衣壳蛋白VP7基因为靶基因,以增强型绿色荧光蛋白(eGFP)为报告基因,构建了3个小发卡RNA(shRNA)表达载体pHlsiGCRV(x)-CMVeGFP.CIK细胞感染实验表明,pHIsiGCRV2-CMVeGFP具有较高的病毒抑制作用.通过显微注射将pH1siGCRV2-CMVeGFP导入稀有(鮈)鲫(Gobiocypris rarus)受精卵,获得转基因稀有(鮈)鲫P0代群体.转基因稀有(鮈)鲫攻毒实验显示,转基因稀有(鮈)鲫死亡率为30%,抗草鱼出血病能力显著提高.进一步的实时荧光定量PCR检测证实,转基因稀有(鮈)鲫脾脏、后肠和肝脏中GCRV的含量显著低于对照鱼,并随着时间的延续逐渐减少,转基因稀有(鮈)鲫体内GCRV的复制受到有效抑制.研究为抗草鱼出血病转基因鱼育种奠定重要基础. 相似文献
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稀有鮈鲫对重铬酸钾和3,4-二氯苯胺急性毒性研究 总被引:1,自引:0,他引:1
目的和方法稀有鮈鲫(Gobiocypris rarus)作为一种本土特有的小型鱼类,是我国正在标准化的化学品毒性测试生物之一。为评价稀有鮈鲫鱼类急性毒性实验中效应的稳定性和可重复性,研究优化筛选了重铬酸钾和3,4-二氯苯胺两种化学品,分别在单一实验室内及不同实验室间进行急性毒性验证实验。结果对于来源相同、体长固定的稀有鮈鲫,无论在实验室内还是实验室间,两组化学品的96 h LC50值均在x珋±2s的质量控制范围之内,所有结果体现了很好的稳定性和可重复性。结论根据研究获得的数据可建立一个有效的稳定性和可重复性衡量数据库,用来评估之后其他单个实验的可靠性;稀有鮈鲫作为一种具有潜力的生态毒性测试的生物种类,具有成为标准实验动物的潜能。 相似文献
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稀有鮈鲫临界温度的研究王剑伟中国科学院水生生物研究所武汉430072稀有钢鲫(ffobmpniranYeetFu)是一种小型鲤科鱼类,在作为一种新的实验鱼。灭蚊鱼等方面具有广阔的应用前景[’,’)。从1990年开始,我们就积累了有关稀有铜鲫越冬、度夏... 相似文献
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稀的Ju鲫的染色体核型初报 总被引:6,自引:2,他引:4
稀有鲫 (GobiocyprisrarusYeetFu)是我国特产的一种小型鲤科 (Cyprinidae)鱼类 ,属于亚科(Danioninae)鲫属[1 ] 。稀有鲫具有适应力强、性成熟周期短、繁殖季节长、产卵频次多等特点 ,是一种有发展前途的实验动物 ,已经被越来越多地应用到生态、遗传、生理和环境毒理等研究领域。但是 ,有关稀有鲫的细胞学背景研究还不够充分 ,其染色体核型仅有个别非正式的研究报告。本文对稀有鲫的染色体核型以及核仁组织区的银染结果作了初步研究 ,现将结果报道如下。1 材料与方法稀有鲫由本所… 相似文献
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为探讨中国鲤形目鱼类中轴骨骼数及其与系统发育和生态习性的相关性,采用X光透视照相法对157种鲤科(Cyprinidae)、鳅科(Cobitidae)、平鳍鳅科(Balitoridae)鱼类的脊椎骨数、肋骨数、尾椎数进行了比较分析。结果显示,中国鲤形目鱼类的脊椎骨数在30-52枚之间,均值39.45?4.44;肋骨数在8-28对之间,均值15.27?3.08;尾椎数在14-34枚之间,均值21.08?2.89。依据脊椎骨数、肋骨数、尾椎数对鲤科各亚科进行聚类,显示鲤科12个亚科分为2大类:雅罗鱼类,包括雅罗鱼亚科、鲌亚科、鲴亚科、裂腹鱼亚科等4亚科;鲃类,包括鲢亚科、鮈亚科、鱼丹亚科、鲃亚科、野鲮亚科、鳅鮀亚科、鲤亚科、鱊亚科等8亚科。单因素方差分析显示,鲤科肉食性鱼类的肋骨数与脊椎骨数的比值显著少于植食性鱼类(P<0.05),而脊椎骨数、尾椎数则显著多于植食性鱼类(P<0.05)。中上层鱼类的脊椎骨数、尾椎数显著多于下层鱼类(P<0.05)。极小型鱼类的脊椎骨数、肋骨数,以及肋骨数与脊椎骨数之比显著少于大型鱼类(P<0.05)。表明鲤科鱼类的中轴骨骼数与其系统发育和生态习性及体型具有明显的相关性。 相似文献
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Profiles of SARS-CoV-2 RNA and Antibodies in Inpatients with COVID-19 not Related with Clinical Manifestation: A Single Centre Study 下载免费PDF全文
Zhao Li Gao Ruqin Lu Roujian Wang Huijuan Deng Yao Niu Peihua Jiang Fachun Huang Baoying Liang Jiwei Jia Jing Zhang Feng Wang Wenling Wu Guizhen Tan Wenjie 《中国病毒学》2021,36(5):1088-1092
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
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