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《小哥白尼(野生动物画报)》2014,(9)
<正>傻傻乌龟爱排队地点:奥利利维也纳Haus des Meeres-Aqua Terra动物园众所周知,乌龟行动缓慢。除此之外,它们还很爱"排队"哦!不信的话,请看奥地利一群搞笑乌龟的现身说法。起初,3只乌龟排着队过独木桥。突然,领头的那只乌龟不知为何来了个"急刹车",后面的两只乌龟来不及反应,继续向前,全挤在了第一只乌龟的背上。更有趣的是,后面竟然又有几只不明真相的乌龟跟上来,在独木桥上排成了"一条龙",把围观的游客们逗得哈哈大笑。 相似文献
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《小哥白尼(野生动物画报)》2014,(3)
<正>鳄鱼:饿死了,咦!前方有只乌龟,它是我的午餐了。哈哈!鳄鱼一口咬了上去。乌龟:啊!救命!放开我!鳄鱼:我偏不放。乌龟听后,十分生气,180度旋转,看看我的龟龟神踢。乌龟一下子将鳄鱼的牙踢掉了好几颗。鳄鱼:啊!我的牙!555乌龟:去补牙吧,嘻嘻——(广州李婉莹) 相似文献
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乌龟与鳖的生物学及其人工养殖 总被引:4,自引:0,他引:4
乌龟(Chinemys reevsii)又名金龟、草龟。鳖或中华鳖(Trionyx sinensis)又名甲鱼、团鱼。乌龟在我国分布较广,如长江流域,河南、山东、河北、陕西、四川、云南、广东、广西等;朝鲜、日本也有分布。在安徽、江苏、浙江、广东、云南、台湾、海南岛等地还较广地分布着一种水龟(Clemmys mutica)。其区别是:乌龟头后端具小鳞,而水龟头部光滑无鳞(图1)。乌龟的背 相似文献
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绿毛乌龟是江浙一带的观赏动物,它身上的背部长满绿油油的细毛,当乌龟爬动时,身上的细毛也随之在水中漂动,乌龟静止不动并将头缩回壳内,身上的绿毛好似一个小小的绿色绒球漂在水中。引起人们很大兴趣,究竟乌龟身上是否长了绿毛,它的超微结构又如何,没有人报告过,本文就此问题加以研究。 相似文献
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环境温度和食物种类对乌龟幼仔生长和消化的影响 总被引:9,自引:0,他引:9
本文报道了不同环境温度和食物种类对一龄乌龟和二龄乌龟生长率、摄食量、消化率以及食物消化时间的影响。结果表明:随温度升高 (20℃→30℃),幼龟生长率、摄食量逐渐增加;一龄乌龟消化率随温度升高逐渐降低;但二龄乌龟的消化率在各温级间基本保持一致。食物消化时间与温度呈直线负相关。温度、食物种类和动物大小对幼龟食物脂肪消化率影响不显著。食物种类和动物大小对生长率、消化率的影响程度随温度而变,但对食物消化时间没有显著影响。 相似文献
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Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis
It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
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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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肝癌中HBV和HCV基因和抗原的分布及意义 总被引:1,自引:0,他引:1
采用原位分子杂交方法检测HCV
RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV
RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV
RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV
X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV
C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细 相似文献
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H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献