共查询到20条相似文献，搜索用时 62 毫秒
1.
运用RT-PCR技术克隆了水稻南方黑条矮缩病毒（southern rice black-streaked dwarf virus,SRBSDV）湖南鼎城株系的基因组S10片段（SRBSDV-HuNDCS10）,并对其全序列进行了测定和生物信息学分析。结果显示,SRBSDV-HuNDC S10片段全长为1797bp（登录号：JQ337964）,含有1个ORF,编码557个氨基酸残基的衣壳蛋白,推测分子量约62.6kD,推测等电点为7.62,与已报道的广东、海南和云南分离物病毒的S10作比较,它们的核苷酸相似性分别为99.7%、99.0%和98.4%,氨基酸相似性分别为100.0%、99.5%和99.3%。对SRBSDV-HuNDCS10及部分Fijiviruses病毒对应片段在5＇URT与3＇URT存在的保守序列和互补序列进行了归纳,对其ORF编码的氨基酸序列进行了motif查找,得到该属（Fijiviruses）氨基酸序列的10个保守区段。此外,进行了糖基化位点、磷酸化位点及B细胞抗原表位预测,发现了3个可能的N端豆蔻酰基化位点,可能与病毒的侵染机制有关。 相似文献
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马哈利樱桃PGIP基因克隆及全序列测定 总被引：12，自引：0，他引：12
以马哈利樱桃（Ｐｒｕｎｕｓ ｍａｈａｌｅｂＬ．）基因组ＤＮＡ为模板,用ＰＧＩＰ（多聚半乳糖醛酸酶抵制蛋白）基因保守序列为引物进行ＰＣＲ扩增,得到长度约为１．２ｋｂ的目的片段,将其克隆到ｐＵＣｍ－Ｔ载体上,进行序列测定,结果表明,目的片段全长１１９２ｂｐ,由２个外显子和１个内含子构成,外显子总长９９６ｂｐ,编码３３０个氨基酸,与杏的ＰＧＩＰ基因ｍＲＮＡ序列、编码的氨基酸序殓同源性分别达到９４．１％、 相似文献
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水稻受稻瘟病菌诱导的转座类似蛋白新基因RIM2的分离与鉴定 总被引：5，自引：0，他引：5
以近等基因系H7R和H7S为材料，运用差别显示（DD－PCR）技术获得RMal9片段。用此片段为探针筛选cDNA文库，获得3944bp全长基因RIM2。Northern杂交华结果显示该基因在水稻抗感品系中均受稻瘟病菌的强列诱导。RIM2 ORF编码653个氨基酸，其序列与多种植物转座类似蛋白有32％－55％的同源性，其5′端约800bp与Xa21基因家庭Al，C的非编码区有82％的序列同源性。Southern杂交表明RIM2多拷贝存在与水稻基因组中。RIM2为一新的受病菌诱导的早期反应基因。 相似文献
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取对虾（Penaeid shrimp)白斑综合征病毒（WSSV）基因组DNA随机文库中1个约8kb的克隆片段进行测序，DNA序列用DNAstar软件进行分析，共发现43个100bp以上阅读框（ORF），其中1条链31个，互补链12个，用BLAST软件将43个ORF及其推导的氨基酸序列分别与GenBank中核酸蛋白数据序列进行相似性比较，结果无显著同源性。从白斑综合征病毒基因组的测序片段中，发现一个810bp阅读框，其编码氨基酸序列与海栖热袍菌（Thermotoga maritima) 外膜蛋白有24％的同源性，设计一对引物，扩增出该阅读框，用T载体克隆并按正确阅读框连接到E.coli表达载体pGEX-6p－1上。重组菌经IPTG诱导后，菌体SDS－PAGE显示有1条大小为56kD的融合表达蛋白产生。 相似文献
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猕猴桃ACC合成酶基因家族四个成员的克隆 总被引：5，自引：0，他引：5
通过PCR方法从中华猕猴桃中分离出ACC合成酶基因家族的四个成员（AC－ACS1A、AC－ACS1B、AC－ACS2和AC－ACS3）的基因组DNA片段，AC－ACS1A、AC－ACS1B和AC－ACS2与其它植物该基因的氨基酸序列同源性最高可达76％以上，而AC－ACS3与其它植物ACC合成酶基因的氨基酸序列同源性均低于60％，与已知的其它猕猴桃ACC合成酶基因的同源性在51％－56％之间，且不存在MSSFGL保守区，因而属于一个未见报道的新成员。 相似文献
6.
一个水稻与稻瘟病毒菌（Magnaporthe grisea）互作相关新基因的克隆 总被引：4，自引：0，他引：4
以水稻抗瘟性近等基因系H7R和H7S为材料，采用PCR－差别筛选（PCR－based differential screening）的方法分离和克隆了一个受稻瘟病菌诱导表达的基因，RIM9b。Northern杂交显示该克隆为受稻瘟病菌诱导的早期反应基因（片段）。其转录丰度在诱导12h达到最高峰。Southern杂交结果表明该基因以单拷贝存在于水稻基因组中。序列分析表明克隆包含一个558bp的开放阅读框，其序列与GenBank中数据无同源性。 相似文献
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猪繁殖与呼吸综合征病毒（PRRSV）BJ—4株全基因组序列测定与分析 总被引：24，自引：1，他引：24
在国内首次完成了猪繁殖与呼吸综合征病毒分离毒株的全基因组序列测定。用RT－PCR方法分段扩增出PRRSV北京地区分离株BJ－4株的21条cDNA片段，分别克隆于pGEM-T-easy质粒载体并进行测序，按顺序将这些序列进行拼接得到PRRSV BJ－4株全基因组cDNA序列。测序结果表明PRRSV BJ－4株基因组全长15504b，包含8个开放阅读框，5′端有190nt先导序列；3′端有256ntUTR，其中包括95ntPoly(A)尾。PRRSV BJ－4株与美洲型毒株VR－2332和Nebreska的核苷酸同源率分别为99．5％和98．4％，而与欧洲型代表株LV株的核苷酸同源率为62．5％，与另一国内分离株CH－1a株编码构蛋白基因的核苷酸同源率为93．3％。 相似文献
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团头鲂和广东鲂生长激素cDAN的分子克隆和序列分析 总被引：2，自引：0，他引：2
从团头鲂（Megalobrama amblycephala）和广东鲂（Megalobrama hoffmanni）的脑垂体组织提取总RNA,采用3′－RACE－PCR的方法,从中扩增出编码两种鲂生长激素（growth hormone,GH）成熟肽的cDNA序列,克隆到pGEM-T Easy Vector载体上。克隆的团头鲂和广东鲂GHcDNA均包括编码188个氨基酸残基的GH成熟肽序列和3′端的非翻译区,但不含信号肽序列和5′端非编码区。序列分析结果表明,团头鲂和广东鲂GH的碱基序列和推测的氨基酸序列的同源性分别为99％和100％。 相似文献
9.
花特异表达启动子PchsA的克隆及其序列分析 总被引：6，自引：0，他引：6
根据Ingrid M报道的矮牵牛花特异表达基因CHS A启动子的序列设计并合成一对特异引物，以矮牵牛（Petunia hybrida）叶片总DNA为模板，通过PCR扩增获得约含0.5kb大小的DNA片段，回收该片段并克隆到pGEM^R-T Easy载体上，进行测序，该片段含514bp。采用pcgene软件进行启动子序列结构的分析，第401－407之间有一个TATA box，第52－62位碱基间有一个CCAAT box，第429－434之间有一戴帽位点（cap site)，第21－36个碱基间有一个anther blox，第303－320位碱基间有一个box2元件，第335－349位碱基间有一个box1元件，box1元件内包含有一个G－box，第362－267之间还有一下G－box，第370－382之间有2个拷贝的TACPyAT box，所有这些调控元件及其附近的序列与报道的序列完全一致。但该序列在第78－248个碱基间比报道序列多出一段171bp的序列，经Splice site prediction分析，在第146－250bp之间为一内含子的序列（105bp)。 相似文献
10.
水稻几丁质酶基因的克隆及序列分析 总被引：1，自引：0，他引：1
采用ＰＣＲ技术从水稻基因组ＤＮＡ中扩增出２个编码几丁质酶基因片段ＲＣＨ１０和ＲＣＨ８,片段大小分别为１０２３ｂｐ和９７６ｂｐ。将ＰＣＲ产物直接做ＮＤＡ序列分析,证明扩增出的２个片段具有编码Ⅰ类几丁质酶的基本结构,即（１）Ｎ－端信号肽区;（２）ｈｅｖｅｉｎ ｄｏｍａｉｎ结构区;（３）可变间隙区;（４）催化结构区。其中ＲＣＨ１０的核苷酸序列与文献报道相比同源性为９７％,氨基酸序列同源性为９３％;ＲＣＨ 相似文献
11.
Suyundukov Ya. T. Suyundukova M. B. Bezuglova O. S. Khabirov I. K. Khasanova R. F. Semenova I. N. Rafikova Yu. S. Ilbulova G. R. 《Eurasian Soil Science》2022,55(1):27-35
Eurasian Soil Science - The results of the study of the properties of urban soils of the city of Sibay located in the mining region of the Republic of Bashkortostan are presented. A specific... 相似文献
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Kholodov V. A. Farkhodov Y. R. Yaroslavtseva N. V. Ziganshina A. R. Maksimovich S. V. 《Eurasian Soil Science》2022,55(7):998-1004
Eurasian Soil Science - Layers were step-by-step removed from macroaggregates (2–1 mm in diameter) of Protocalcic Chernozems via successive abrasion in a revolving rotator during 5, 10, 15,... 相似文献
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《Communications in Soil Science and Plant Analysis》2012,43(15-16):1631-1646
Abstract Brazil has approximately 30 million hectares of lowland areas, known locally as “Varzea,”; distributed throughout the country. Soils in these areas have the potential to support agricultural production, but very little is known about their fertility. The current experiment was undertaken to characterize the chemical and physical properties of representative “Varzea”; soils collected at 0–20, 20–40, 40–60, and 60–80 cm depth intervals from 23 sites in Goias State of Brazil. Organic matter contents averaged 42 g/kg in the surface 20 cm of soil and should make a significant contribution to overall nutrient availability. Soil pH increased slightly with depth from a mean value of 5.2 in the surface 20 cm of soil to a mean value of 5.4 in the 60–80 cm depth interval. Several soils had exchangeable Al values ≥ 1.0 cmol Al/kg, but soil Al saturation was generally less than the 60% level frequently associated with Al toxicity. However, cereal and legume production could benefit from lime addition in many of these soils. Although base saturation was fairly low in some soils, exchangeable Ca and Mg levels were, in general, adequate throughout the profile. Extractable P levels were adequate in most surface soil samples. Extractable K levels in these soils were generally low, and the application of K fertilizers should be beneficial, especially in conjunction with lime addition. The high clay content “Varzea”; soils of the Brazilian lowlands have some drainage problems but generally exhibit favorable chemical properties for crop production when compared to soils of the well‐drained Cerrados. 相似文献
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Ye. V. Rogozhina N. V. Kostina L. S. Malyukova 《Moscow University Soil Science Bulletin》2011,66(1):32-35
An estimation of potential nitrogen-fixing activity of various soil types under agrophytocenoses of tea, filbert, peach, and
pawpaw which grow in the area of Greater Sochi is given. High indicators of nitrogen fixation activity in the soil in the
course of vegetation were characteristic of agrocenoses of pawpaw, peach, and filbert. The lowest level of nitrogen fixation
was noted in the soil of a tea plantation. A negative correlation dependence of potential nitrogen-fixing activity on the
acidity of the soil solution was established. A study of the seasonal dynamics of the activity of nitrogen fixation of soils
of agrocenoses of the subtropical zone of Russia made it possible to distinguish a less active winter and more active spring-summer-autumn
periods. 相似文献
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The rate of popping of popcorn was measured in oil and in air. Kinetic data for lifetimes of individual kernels from a large population were obtained in oil at six constant temperatures (180–250°C) and also in an air‐popper at 202°C. The data are characterized by an induction period, which is, significantly, followed by a first‐order decrease in the number of unpopped kernels versus time. The activation energy for the first order process is 166.7 kJ/mol between 180 and 210°C, and 53.8 kJ/mol between 210 and 250°C. These data are consistent with a model that assumes 1) that the rate of heat transfer into a kernel follows Newton's law of cooling; 2) that in a sample of kernels there exists a distribution of critical pressures; 3) that for an individual kernel, the probability of popping is directly proportional to the difference between the internal aqueous vapor pressure and the kernel's critical pressure; and 4) that the measured rate constant at any temperature is an average overall of the kernels in the sample with critical pressures equal to or less than the internal aqueous vapor pressure. Minimum popping temperatures predicted by the model are 181 ± 2°C (oil) and 187 ± 2°C (air), in good agreement with previously reported direct measurements. 相似文献
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物联网是一个集信息通信、数据交换、传感器技术与软件工程于一体的综合性产业,探讨和分析了物联网的结构体系与发展中遇到的安全问题。 相似文献
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荔枝种子从果实中剥离出来后, 即使在室内条件下, 也极易失水干缩, 潮湿环境中又易发霉而腐烂。扫描电镜观察表明: 种皮上布满纹孔, 水分散失面积很大; 种脐部为疏松的海绵组织, 且营养丰富。据此, 生产上应对种子彻底清洗, 并保存于适当湿度的环境中, 以提高其发芽率。 相似文献