共查询到20条相似文献，搜索用时 187 毫秒
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通过RT-PCR技术从猪肝脏总RNA中扩增出Hepcidin基因的编码序列,将该序列及其推导的氨基酸序列与其它17个已知物种的相应序列进行同源性分析,并构建系统进化树。结果表明,克隆得到的Hepcidin基因cDNA序列长278 bp,编码82个氨基酸,预测的蛋白分子质量和等电点分别为8.76 ku和9.06;与已知牛的Hepcidin序列同源性最高,达81.71%,不同物种Hepcidin蛋白具有高度的保守性,Hepcidin蛋白物种进化树符合物种进化规律。本研究为今后阐明Hepeidin基因表达特性、表达产物理化性质、抗菌活性及其相关功能等奠定基础。 相似文献
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以黄鳝为材料,提取肝脏总RNA,经RT-PCR扩增出Hepcidin基因cDNA的开放阅读框(ORF)及3′端非编码区序列(GenBank序列号FJ436807),序列分析表明,黄鳝Hepcidin含有一个273 bp的ORF,编码90个氨基酸残基,有信号肽(24个残基)、前体肽(40个残基)和成熟肽(26个残基)。在前肽部分具有前肽转化酶典型的RX(K/R)R基元。同源性比对表明,黄鳝Hepcidin与其他鱼类的同源性在40%以上,是Hepcidin抗菌肽家族的新成员。 相似文献
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《农业工程技术:农产品加工》2008,(5):66
兰花卉市场上同一系列的雪铁芋'Zamicro'(vbn code:100641)成为热销盆花品种. 迷你雪铁芋'Zamicro'于2007年8月推向市场,仅一年时间便销售了3万盆,除了株型、叶片质量等表现突出外,铁芋'Zamitro'其他特性与10年前推出的品种没有太大差别.它是一种十分容易养活植物,一周浇一次透水就已足够,偶尔即使忘记浇水也没关系,它多汁的茎叶中保存的水分可以使其在干燥的环境也能安全度过.此外,其植株生活期很长. 相似文献
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目的 探讨铁调素（Hepcidin）在慢性牙周炎性牙槽骨吸收过程中的作用,阐明铁离子及其相关调节蛋白在牙槽骨吸收中的重要生物学意义,以期为探索出有效地防治牙槽骨吸收的方法提供理论基础。方法 检测慢性牙周炎患者龈沟液（GCF）中铁离子、核因子KB受体活化因子配体（RANKL）、骨保护素（OPG）的表达水平,分析铁离子的含量与RANKL和OPG表达的相关性以及铁离子的含量与牙周炎性牙槽骨吸收的关系。结果 20例慢性牙周炎组受检牙GCF中铁离子、Hepcidin和RANKL的浓度高于健康对照组（P<0.05）,OPG的浓度低于健康对照组（P<0.01）。慢性牙周炎组GCF中RANKL和OPG的浓度与该受检牙4项临床指标：牙周探诊深度（PD）、附着丧失（AL）、菌斑指数（PLI）、龈沟出血指数（SBI）无相关（P>0.05）,铁离子浓度与Hepcidin浓度呈正相关（P<0.01）,与RANKL浓度呈正相关（P<0.05）,与OPG浓度无相关（P>0.05）。结论 慢性牙周炎导致的牙槽骨吸收与局部Hepcidin升高和发生铁过载有关。 相似文献
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Bailes M Bates SD Bhalerao V Bhat ND Burgay M Burke-Spolaor S D'Amico N Johnston S Keith MJ Kramer M Kulkarni SR Levin L Lyne AG Milia S Possenti A Spitler L Stappers B van Straten W 《Science (New York, N.Y.)》2011,333(6050):1717-1720
Millisecond pulsars are thought to be neutron stars that have been spun-up by accretion of matter from a binary companion. Although most are in binary systems, some 30% are solitary, and their origin is therefore mysterious. PSR J1719-1438, a 5.7-millisecond pulsar, was detected in a recent survey with the Parkes 64-meter radio telescope. We show that this pulsar is in a binary system with an orbital period of 2.2 hours. The mass of its companion is near that of Jupiter, but its minimum density of 23 grams per cubic centimeter suggests that it may be an ultralow-mass carbon white dwarf. This system may thus have once been an ultracompact low-mass x-ray binary, where the companion narrowly avoided complete destruction. 相似文献
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Action at a distance along a DNA 总被引：35，自引：0，他引：35
A number of ways are known by which an event at one location on a DNA molecule can affect an event at a distant location on the same molecule. Three classes of mechanisms are described for such distal actions: tracking or translocation of a protein along a DNA, the association of two proteins bound at separate sites to form a DNA loop in between, and distal interactions that are affected by the topology of the DNA. The basic characteristics of each type of mechanism are discussed in terms of the known physicochemical properties of DNA. The various modes of action at a distance are often interrelated. Examples include the formation of positively and negatively supercoiled DNA loops by tracking and the strong effects of DNA topology on looping. 相似文献
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When the sensory fiber of a Pacinian corpuscle (in cat mesentery) is transected (at the inferior mesenteric nerve) transduction fails within 30 hours: the nerve ending produces no generator potentials in response to mechanical stimulation. Electrically elicited nerve impulse conduction continues for at least another 18 hours. A transducer mechanism develops on a regenerating nerve fiber when this fiber enters the denervated corpuscle. Such transducer development takes place on myelinated fibers from the inferior mesenteric nerve, which normally supplies corpuscles, as well as on myelinated hypogastric nerve fibers, which normally do not go to corpuscles, including fibers larger than the original corpuscle afferents. 相似文献
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Pathways for the reduction of protein disulfide bonds are found in all organisms and are required for the reductive recycling of certain enzymes including the essential protein ribonucleotide reductase. An Escherichia coli strain that lacks both thioredoxin reductase and glutathione reductase grows extremely poorly. Here, we show that a mutation occurring at high frequencies in the gene ahpC, encoding a peroxiredoxin, restores normal growth to this strain. This mutation is the result of a reversible expansion of a triplet nucleotide repeat sequence, leading to the addition of one amino acid that converts the AhpC protein from a peroxidase to a disulfide reductase. The ready mutational interconversion between the two activities could provide an evolutionary advantage to E. coli. 相似文献
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利用变量替换和Ekeland变分原理,在R～N上获得了一类具有非自治扰动的拟线性椭同方程非平凡解的存在性结果.Abstract： The existence of a nontrivial solution is obtained for a quasilinear elliptic equations on RN with a non-autonomous perturbation by the change of variable and the Ekeland's variational principle. 相似文献