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为了解滇池蓝细菌生物多样性, 于2010 年6 月从滇池采集水样, 通过平板分离纯化及液体培养得到一株蓝细菌。该菌在液体培养下呈聚集状态, 显微镜镜检观察显示该菌呈丝状, 并发绿色及橙红色荧光。以该菌总DNA 为模板,用细菌16S rDNA 通用引物进行扩增, 得到长度约1.5 Kb 的序列, 将该序列连接到pMD 18-T 载体后测序。测序结果与GenBank 比对显示该菌属于颤藻目细鞘丝藻属的一个新种。 相似文献
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通过PCR克隆测序、rDNA序列分析、随机PCR引物扩增结合DGGE技术等三个层次的分子分类水平对厦门海域的典型藻华生物进行分子生物学分析。结果表明,基于DGGE检测的18S rDNA序列过于保守,分类的精确度不高;AP-PCR则是基于基因组的差异进行分析,结果较为精确和全面;而rDNA序列分析相对可靠,尤其是针对ITS的长度和全序列分析以及28S rDNA的D1、D2区的序列分析,可以提供更为准确的分类信息,并可为设计检测探针提供基础。据此对分离自厦门海域的3种典型甲藻及其相关藻株建立了系统进化树。针对23株甲藻ITS序列建立的系统进化树显示Takayama pulchella(AY764179)和Karlodinium micrum的距离最近,并能够把Akashiwo属、Karenia属、Gyrodinium属、Karlodinium属、Takayama属与Gymnodinium属等区分开。用28S rDNA序列建立的系统发育树只能把Karlodinium属、Karenia属和Takayama属区分开,但不能很好地把无纹环沟藻与Akashiwo属和Gymnodinium等的藻区分开。 相似文献
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采用CTAB法提取了人参(Panax ginseng)根基因组DNA,根据植物叶绿体16S rDNA和线粒体18SrDNA与细菌16S rDNA序列具有高度同源性,用扩增细菌16S rDNA的一对通用引物(8f,1492r)扩增了人参细胞器核糖体小亚单位DNA.对扩增产物进行了克隆与测序,经多序列比对,扩增片段分别与已知植物叶绿体16S rDNA和线粒体18S rDNA具高度同源性,表明该对引物可以用来扩增绝大多数植物细胞器核糖体小亚单位DNA,可以作为鉴定植物叶绿体16S rDNA和线粒体18S rDNA的一种基本实验技术. 相似文献
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该文报道了一株采自黑龙江省伊春市的鱼鳞藻,使用透射电子显微镜对其鳞片和刺毛等主要鉴定特征的亚显微结构进行观察,将分离纯化后的藻株提取DNA并扩增目的基因SSU rDNA及LSU rDNA,根据基因序列联合构建系统发育树,结合形态学特征与分子生物学方法,鉴定该鱼鳞藻为中型鱼鳞藻(Mallomonas intermedia),该种也是首次在中国和亚洲发现。同时讨论了该种与鱼鳞藻属同一系列其他组物种的系统关系以及该种在全球的分布与传播。该研究为中型鱼鳞藻的地理分布、金藻和其他微藻的传播扩散提供了新的资料。 相似文献
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[目的]建立布鲁氏菌的16S rDNA序列分析方法,评价该方法鉴定布鲁氏菌的特异性和实用性.[方法]用PCR扩增布鲁氏菌的16S rDNA片段,将扩增的产物纯化后测序,从GenBank下载与布鲁氏菌易发生血清学交叉反应的细菌的16S rDNA序列.使用DNAMAN软件进16S rDNA序列相似性分析.[结果]在布鲁氏菌中16S rDNA核苷酸序列相似性达到了99.74%,而与其他有血清型交叉反应的菌株相比较,16S rDNA序列间有显著差异.[结论]16S rDNA序列分析是一种快速、简便、特异的鉴定布鲁氏菌的方法之一. 相似文献
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利用通气培养系统, 对10株经过初步生长筛选的微藻进行培养, 以总脂单位体积产率为主要指标, 筛选具有产油潜力的优良藻种。结果表明, 10株微藻的生物质干重、总脂含量分别为0.81.6 g/L、14.8%39.7%, 总脂单位体积产率大于30 mg/(Ld)的有6株, 其中藻株HY-6总脂单位体积产率达到最高的50.8 mg/(Ld), 是一株具有潜力的产油微藻。运用形态学特征和18S rDNA及ITS系统学分析相结合的方法对藻种HY-6进行分类鉴定。依据形态学特征, HY-6为球状单细胞, 具有1个明显的蛋白核, 杯状色素体周生, 从而初步判断该藻株可能属于小球藻属(Chlorella)或拟小球藻属(Parachlorella); 18S rDNA及ITS系统学分析表明HY-6与小球藻属分为两个不同的进化支, 但与凯氏拟小球藻(Parachlorella kessleri)的亲缘关系较近, 且具有较高的自展支持率, 因此将其鉴定为凯氏拟小球藻(P. kessleri)。研究结果将为产油微藻资源的收集、筛选及后续研究提供基础。
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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980. 相似文献
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N. P. Vesselkin Yu. V. Natochin 《Journal of Evolutionary Biochemistry and Physiology》2010,46(6):592-603
Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms.
The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal
mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization
followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The
mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction
of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms
are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning
of physiological systems and organs of the living organism 相似文献