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中国大口涡虫属三新种(扁形动物门,大口虫目,大口虫科) 总被引:10,自引:1,他引:9
报道中国广东地区生活于淡水的大口涡虫属3新种:即中国大口涡虫Macrostomum sinensis sp.nov.;针大口涡虫M.acus sp.nov.;钝大口涡虫M.obtusa sp.nov..对其形态特征作了详细描述,并与近似种进行了比较.所有标本保存在深圳大学生命科学学院实验室. 相似文献
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中国大口涡虫属一新种记述(大口虫目,大口虫科) 总被引:10,自引:6,他引:4
记述大口涡虫属1新种,即厦门大口涡虫Macrostomum xiamensis sp.nov..新种的主要鉴别特征是几丁质交接刺光滑、较细长,表面无几丁质瓣膜.其远端呈螺旋状弯曲,弯曲部的平面上夹角达60度,压片后的夹角达100度,螺旋部超过半圈,交接刺末端呈注射器针的末端,开口于螺旋状弯曲面的外侧.标本采自厦门市区菩陀寺的淡水荷花池塘内,水质属富营养型.所有标本保存在深圳大学生命科学学院实验室. 相似文献
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报道了大口虫目大口虫科中国一新纪录种,即帆大口涡虫Macrostomum saifunicum Nasonov,1929,详细研究了该涡虫的个体发育与角质阴茎发育的关系.结果 表明:1) 帆大口涡虫角质阴茎端部结构在个体发育的第9 d 一次性成型,终身不变,是一个稳定的关键分类性状; 2) 个体发育至第20 d 后,角质阴茎长度达140 μm,第40 d后个体进入衰老期,其角质阴茎长度超过160 μm,指出角质阴茎的长度不是一个稳定的分类性状; 3) 根据作者多年的野外采集,发现北京、安徽、湖南、江西、广东均有帆大口涡虫分布,指出该物种是中国常见的分布较广的物种,并提示大口涡虫是一种在教学和科学研究方面理想的实验动物. 相似文献
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大口涡虫属所有物种均为雌雄同体,具一套交配器官。作者于2015年在广东省的两处淡水环境,首次发现2个具有双雄性交配器官的大口涡虫(Macrostomum sp.)标本。通过对活体、整装片、连续组织切片的显微镜观测,发现2只标本的两套交配器官呈左右排列;每套交配器官具备完整的假储精囊、储精囊、颗粒囊与交配刺;假储精囊与储精囊内具有精子;雄孔分别为1个与2个;交配刺的结构与中国已经记录的物种都不相同。本研究对其做了较为详细的描述,并初步探讨了大口涡虫多交配器官发生的原因。 相似文献
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我国涡虫纲分类学的研究 总被引:2,自引:0,他引:2
我国涡虫纲分类学的研究李光鹏(黑龙江省科学院自然资源研究所哈尔滨150040)关键词涡虫,涡虫纲,分类学扁形动物门涡虫纲动物生活在海洋、淡水和潮湿的土壤中。多数营自由生活,少数为共生或寄生生活。是一类种类繁多,形态、大小、色泽和栖息环境多样性的动物[... 相似文献
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原卵黄目(Prolecithophora)柱口科(Cylindrostomidae)肠口涡虫属(Enterostomula)为海栖涡虫,全球记录3种,在中国未见报道。作者在广东省深圳市深圳湾海边(22°31'N,113°56'E)采集到一种海栖涡虫。本文对该种涡虫进行了较为详细的比较研究,鉴定为柱口科肠口涡虫属格氏肠口涡虫(E.graffi de Beauchamp,1913),为中国新纪录科新纪录属一新纪录种。该种涡虫多数个体背部具2条黑色横纹,部分个体背部花纹有明显变化。眼点2对。雌雄同体,精巢、卵巢各1个。受精囊位于卵巢与子宫之间;子宫位于体末端,后接一微小的外阴道。本文发现:①该涡虫的尾部腹面具有一个交配囊及一根雌性生殖管,交配囊是一个由肌肉层组成的袋状囊,同时与子宫、雌性生殖管相连;②雌性生殖管外围有明显的生殖腺包裹;③雌性生殖管孔、阴茎孔与口孔一起通往体外;④此种涡虫喜分泌黏液将微小杂质粘结呈半球状窝,虫体隐藏于窝内。 相似文献
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平角涡虫早期胚胎发育的观察 总被引:1,自引:0,他引:1
平角涡虫属于扁形动物门,涡虫纲,多肠目海产种类,广泛分布于我国沿海潮间带,对于扁形动物胚胎发育的研究大多以涡虫纲自由生活种类为材料,其中三肠目种类在自然条件下以无性生殖为主,有性生殖较少出现而且早期发育多在卵袋中完成,不利于早期胚胎发育的研究,多肠目... 相似文献
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涡虫的采集培养和切割再生方法 总被引:4,自引:1,他引:4
迄今,我国的淡水涡虫已发现七种,其中最常见的是东亚三角头涡虫(Dugesis iaponicua),分布于香港、台湾、昆明直到吉林省境内,和细形山地涡虫(Phagocato vivida),分布于大、小兴安岭和长白山一带。七种淡水涡虫都喜生于冷泉溪流的石下。采集涡虫时,途中要防止水温的骤升。制作切片的涡虫采集,需将涡虫用稀酸杀生,鲍氏液固定,然后放酒精中带回。用带盖的塘瓷盘加水培养涡虫,既接近生境,便于实验操作和换水,又能使涡虫较好的生殖和产卵。切割再生实验,既能定向地培育出双头、双尾、多头和多尾的畸型涡虫,又能增加超常数眼涡虫出现的频率。 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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