共查询到20条相似文献，搜索用时 31 毫秒
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Alberch P 《Science (New York, N.Y.)》1983,221(4607):257-258
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分离女性阴道中的粪肠球菌（Enterococcus faecalis）,通过PCR和Kirby-Bauer(K-B)纸片扩散法探究其毒力基因、耐药基因及其耐药表型,为揭示粪肠球菌感染机制及其临床治疗提供科学依据。结果表明：从157个样品中共分离出22株粪肠球菌;在这些粪肠球菌中：毒力基因检出率为efa A (100%)、asa1 (90.9%)、cyl A (90.9%)、fsr (90.9%)、cpd (90.9%)、acm (86.4%)、gel E (81.8%)、esp (68.2%)、ace (54.5%)和hyl (0);耐药基因的检出率为van A (0)、van B (0)、van C (18.2%)、aac (40.9%)、ant(6)-1 (59.1%)、erm B (68.2%)、mef A(54.5%)、tet M (72.2%)和tem (81.8%);药敏结果显示粪肠球菌对万古霉素、呋喃妥因、利奈唑胺、替考拉宁敏感;对其他抗菌药物具不同程度的耐药。由此得出,阴道易受粪肠球菌感染,体外实验支持糖肽类抗菌药物可用于粪肠球菌感染的临床治疗。 相似文献
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对植物抗病基因的克隆技术及已克隆的一些抗病基因作了概述,归纳了抗病基因的类型、产物结构和功能,对抗病基因进化的可能分子机制也作了讨论. 相似文献
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T Quertermous C Murre D Dialynas A D Duby J L Strominger T A Waldman J G Seidman 《Science (New York, N.Y.)》1986,231(4735):252-255
The human T-cell gamma chain genes have been characterized in an attempt to better understand their role in immune response. These immunoglobulin-like genes are encoded in the genome in variable, joining, and constant segments. The human gamma genes include at least six variable region genes, two joining segments, and two constant-region genes in germline DNA. Variable and joining segments recombine during the development of T cells to form rearranged genes. The diversity of human gamma genes produced by this recombinational mechanism is greater than that produced by the murine genome but is more limited than that of other immunoglobulin-like genes. 相似文献
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玉米贮存蛋白及高蛋氨酸相关基因研究进展 总被引：1，自引：0，他引：1
郑大浩 《延边大学农学学报》2012,34(1):87-92
成熟的玉米籽粒中蛋白质含量为8%～10%,其中,约80%为胚乳蛋白,主要由被称为醇溶蛋白(zein)的胚乳贮存蛋白所构成。玉米醇溶蛋白分为α,β,γ和δ等4种类型,其中,α类型包含19kDa和22kDaα-醇溶蛋白2个组分,β类型只有15kDaβ-醇溶蛋白1种,γ类型包含16kDa、27kDa和50kDaγ-醇溶蛋白等3个组分,而δ类型包含10kDa和18kDaδ-醇溶蛋白等2个组分。在玉米醇溶蛋白中,α类型占70%以上,但其蛋氨酸含量非常低,只有1%～2%。约占20%的β类型,其蛋氨酸含量约10%。γ类型和δ类型的醇溶蛋白在胚乳中的含量很少,但这两类醇溶蛋白的蛋氨酸含量很高,最高分别达到21%和37%。不同的醇溶蛋白由分属于不同多基因家族的基因所编码,涉及到65～100个基因,这些基因存在于不同的染色体上;其中10kDaδ-醇溶蛋白的结构基因dzs10已在高蛋氨酸转基因育种中得到应用。 相似文献
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A plant flavone, luteolin, induces expression of Rhizobium meliloti nodulation genes 总被引：108，自引：0，他引：108
The symbiotic interaction of Rhizobium meliloti and alfalfa results in the formation of nitrogen-fixing root nodules. Rhizobium meliloti nodABC genes are required for the early host responses of cortical cell divisions and root hair curling. The induction of nodABC expression by alfalfa exudates demonstrates host-symbiont signaling at an early stage in nodule development. The inducer molecule for nodABC expression was isolated from plant exudate by constructing a nodABC-lacZ fusion to monitor the inducing activity. From ultraviolet-visible absorption spectra, proton nuclear magnetic resonance, and mass spectrometry, the inducer was determined to be 3',4', 5,7-tetrahydroxyflavone (luteolin). Luteolin is a normal secondary plant metabolite found throughout the plant kingdom that may serve to control nodABC expression during nodule development. This regulatory role for a flavone contrasts with the function of some flavonoids as defense compounds. 相似文献
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苏云金芽孢杆菌 (Bt)研究的热点正逐步转向新资源的收集和开发 .本文就其杀虫、抑菌、抑癌细胞等 6种主要生物活性物质、蛋白及其编码基因作一回顾与展望 相似文献
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Xiao-dong WANG Wei-shuai BI Jing GAO Xiu-mei YU Hai-yan WANG Da-qun LIU 《农业科学学报》2018,17(11):2468-2477
In Arabidopsis, systemic acquired resistance (SAR) is established beyond the initial infection by a pathogen or is directly induced by treatment with salicylic acid (SA) or its functional analogs, 2,6-dichloroisonicotinic acid (INA) and benzothiadiazole (BTH). NPR1 protein is considered the master regulator of SAR in both SA signal sensing and transduction. In wheat (Triticum aestivum) and barley (Hordeum vulgare), both pathogen infection and BTH treatment can induce broad-spectrum resistance to various diseases, including powdery mildew, leaf rust, Fusarium head blight, etc. However, three different types of SAR-like responses including acquired resistance (AR), systemic immunity (SI), and BTH-induced resistance (BIR) seem to be achieved by activating different gene pathways. Recent research on wheat and barley NPR1 homologs in AR and SI has provided the initial clue for understanding the mechanism of SAR in these two plant species. In this review, the specific features of AR, SI, and BIR in wheat and barley were summarized and compared with that of SAR in model plants of Arabidopsis and rice. Research updates on downstream genes of SAR, including pathogenesis-related (PR) and BTH-induced genes, were highlighted. 相似文献
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Robins RW 《Science (New York, N.Y.)》2005,310(5745):62-63
Personality traits have a strong genetic foundation, are highly stable over time, and predict important societal outcomes, including health and occupational success. In his Perspective, Robins discusses Terracciano et al.'s finding that cultures differ somewhat in aggregate personality levels but those differences are not accurately reflected in stereotypes about national character. Robins discusses reasons why national stereotypes are inaccurate, as well as broader issues concerning individual and cultural sources of variation in personality. 相似文献
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从尼罗罗非鱼的细菌人工染色体基因文库中提取和纯化含有卵巢和脑芳香化酶基因的重组质粒DNA,通过简并PCR制备芳香化酶基因原位杂交探针,并用荧光素进行标记。结果显示,尼罗罗非鱼卵巢和脑芳香化酶基因位于2对不同的小染色体上,而不是位于性染色体上。结果提示：芳香化酶基因不是尼罗罗非鱼主要的性别决定基因。 相似文献
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Vertebrate microRNA genes 总被引：3，自引：0，他引：3
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Cellular transforming genes 总被引：65，自引：0，他引：65
G M Cooper 《Science (New York, N.Y.)》1982,217(4562):801-806
Cellular genes potentially capable of inducing oncogenic transformation have been identified by homology to the transforming genes of retroviruses and by the biological activity of cellular DNA's in transfection assays. DNA's of various tumors induce transformation with high efficiencies, indicating that oncogenesis can involve dominant genetic alterations resulting in activation of cellular transforming genes. The identification and characterization of cellular transforming genes and their possible involvement in naturally occurring cancers, is discussed. 相似文献