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Sayyed Mohammad Hadi Alavi Elham Jorfi Azadeh Hatef Sayyed Abdul Saheb Mortezavi 《Aquaculture Research》2010,41(10):e688-e694
Spermatozoa concentration, ionic composition, osmolality, glucose and total protein contents of seminal plasma and sperm motility were determined in Barbus sharpeyi (Cyprinidae, Teleosotei). Spermatozoa concentration ranged from 9.77 to 20.20 × 109 spermatozoa mL?1. Osmolality (mOsmol kg?1) and ionic contents (mM L?1) of the seminal plasma were 274.5±9.0, 70.0±3.4 Na+, 28.8±0.9 K+, 101.7±3.1 Cl?, 0.9±0.1 Mg2+ and 2.1±0.1 Ca2+ respectively. Total protein and glucose were 5.3±0.2 g L?1 and 76.7±4.3 mM L?1 respectively. Sperm motility was initiated in a hypo‐osmotic condition, composed of either an ionic (KCl or NaCl) or a non‐ionic (sucrose) activation medium. Duration of sperm motility was very short: <2 min after activation in distilled water. Percentage of motile spermatozoa was significantly higher in an activation medium containing NaCl compared with that of distilled water. An activating medium containing NaCl or KCl higher than 150 mM or sucrose higher than 275 mM totally inhibited the activation of sperm motility. Immediately after sperm activation, wave(s) propagated along the flagellum, but waves were restricted to the proximal part of the flagellum (close to the head) at 1 min post activation. Studied characteristics in the present study were compared with those of other cyprinids for understanding inter‐species differences. 相似文献
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Christiane Guillorit-Rondeau Laurence Malandrin Regine Samson 《European journal of plant pathology / European Foundation for Plant Pathology》1996,102(1):99-104
Flagellar antigen specificity was studied for the speciesPseudomonas syringae, P. viridiflava andP. cichorii. After checking their motility, bacteria were reacted against six polyclonal antisera containing anti-O (LPS) and anti-H (flagellar) antibodies by indirect immunofluorescent staining. Two distinct flagellar serotypes (H1 and H2) were described. The distribution of H1 and H2 serotypes was then determined for a collection of 88 phytopathogenicPseudomonas strains. Serotype H1 was possessed byP. syringae pv.aptata (12 strains),P. s. pv.helianthi (2),P. s. pv.pisi (11), andP. s. pv.syringae (13). Serotype H2 was possessed byP. cichorii (2),P. s. pv.delphinii (1),P. s. pv.glycinea (4),P. s. pv.lacrymans (1),P. s. pv.mori (1),P. s. pv.morsprunorum (10),P. s. pv.persicae (1),P. s. pv.phaseolicola (8),P. s. pv.tabaci (10) andP. s. pv.tomato (1).P. viridiflava (5) revealed HI, H2 and untyped flagella. The following isolates were untypable by the H1/H2 system:P. corrugata (3),P. fluorescens (2),P. tolaasii (1). H1/H2 serotypes distribution is not linked toP. syringae O-serogroups. On the other hand, H1/H2 distribution seems remarkably linked to the new genospecies of theP. syringae group.Abbreviations CFBP
French Collection of Phytopathogenic Bacteria, Angers, France
- ICMP
International Collection of Micro-organisms from Plants, Auckland, New-Zealand
- NCPPB
National Collection of Plant Pathogenic Bacteria, Harpenden, Great Britain 相似文献
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Victor S Panangala Riccardo Russo Vicky L van Santen Karen G Wolfe & Phillip H Klesius 《Aquaculture Research》2009,40(10):1135-1147
Edwardsiella ictaluri , the cause of enteric septicaemia in channel catfish ( Ictalurus punctatus ), is motile by means of peritrichous flagella. We determined the complete flagellin gene sequences and their organization in E. ictaluri by sequencing genomic segments from a λ-ZAP phage genomic library of E. ictaluri . Four flagellin genes ( fliC1, fliC2, fliC3 and fliC4 ) are arranged in tandem within 6 kb in the E. ictaluri genome. Each flagellin-coding sequence is preceded by a σ28 recognition site consensus sequence. The predicted amino acid sequences of all four flagellin proteins (between 36 and 37.5 kDa) are similar in the N-terminal (1–160 aa) and C-terminal (last 74 aa) portions and are divergent in the central portion of the proteins. Proteins encoded by flC1, fliC2 and fliC3 are more similar to each other (88–90% aa identity) than to the protein encoded by fliC4 (76–78% aa identity). basic local alignment search tool analysis of GenBank sequences showed that all flagellin aa sequences are more similar to those of Serratia marcescens (72–74% identity) than to those of Edwardsiella tarda (≤64% identity). Primary determination of E. ictaluri flagellin gene sequences facilitate advanced studies on the role of flagella in host–pathogen interaction. 相似文献
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本研究旨在对肠炎沙门氏菌（Salmonella Enteritidis）鞭毛蛋白FliC基因进行克隆，并对所获序列进行生物信息学分析。提取该菌基因组DNA作为模板，参考GenBank中肠炎沙门氏菌FliC基因序列设计1对引物，利用PCR克隆获得FliC基因，将其插入到克隆载体中进行测序，应用生物信息学软件分析该基因的核苷酸和氨基酸序列，利用BLAST进行同源性比对，并构建系统进化树，同时对该基因编码蛋白的理化性质、亲水性、信号肽、跨膜结构域、糖基化位点和B细胞抗原表位、二级结构、三级结构等进行分析。结果显示，试验成功克隆了1 518 bp的目的基因，编码505个氨基酸。同源性比对发现，FliC基因相对保守，与大肠杆菌属有较高的同源性。该蛋白的化学分子式为C2254H3701N657O803S4，理论分子质量为52.981 ku，理论等电点为4.91；不稳定指数为16.86，是稳定存在的亲水蛋白质。结构分析结果显示，该蛋白没有信号肽或跨膜结构域，但具有8个N-糖基化位点、13个O-糖基化位点和60个磷酸化位点，同时还含有26个B细胞线性结合位点和5个T细胞结合位点。二级结构分析显示，α-螺旋、β-转角、延伸链和无规卷曲分别占43.76%、3.76%、20.99%和31.49%。本试验成功克隆了肠炎沙门氏菌鞭毛基因FliC，并对其序列结构进行了分析，为进一步研究鞭毛在肠炎沙门致病过程中的作用及基因工程疫苗的研制提供理论依据。 相似文献
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空肠弯曲杆菌是一种人畜共患的食物源性病原菌，可引起人和动物细菌性腹泻，且该菌的感染率逐年递增。鞭毛是细菌菌体的一种特殊结构，与菌体的运动性密切相关，有助于其躲避有害环境，同时鞭毛在细菌的致病性等方面也起着重要作用。研究发现，空肠弯曲杆菌的发病机制与鞭毛在宿主上皮细胞的定植力、黏附、侵袭力及毒素的产生密切相关。文章概述了空肠弯曲杆菌鞭毛结构、功能、调控机制及相关基因等方面的研究进展，通过归纳总结已知基因缺失突变对鞭毛的影响，从分子水平了解鞭毛的调控机制，从而探讨空肠弯曲杆菌的致病机理，以期为降低其感染率提供理论依据。 相似文献
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从鳗源迟钝爱德华菌Edwardsiella tarda菌株ETY的基因组克隆到其鞭毛基因(flagella gene,ETF)。该基因开放阅读框为1 257bp,编码419个氨基酸,推导的蛋白分子量为43.951kD。ELISA和Western-blotting试验证实表达的蛋白与迟钝爱德华菌菌株ETY表达的鞭毛蛋白具有相同的抗原性和免疫原性。免疫攻毒保护试验证明:经表达产物(ETF-rxA融合蛋白)与ISA佐剂结合免疫的日本鳗鲡对爱德华菌ETY的免疫保护率可达到100%。本试验首次成功实现了ETF基因的高效表达,并初步证实了迟钝爱德华菌鞭毛可诱导产生免疫保护,为进一步研制合适的高效的迟钝爱德华菌鞭毛亚单位疫苗奠定了基础。 相似文献
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从酵母培养物中分离出一株运动性极强的细菌,命名为９５０６菌株、该菌株革兰氏染色为阴性,鞭毛周生,每个菌体着生１２－２０根鞭毛,鞭毛 大,地着色,在ＰＤＡ斜布上培养１２－４８ｈ能乍到完整的鞭毛,染色液存放２周不影响鞭染色效果,其效果明显优于大肠杆菌、枯草杆菌等菌株,是一株理想的鞭毛洒色实验教学用菌株 相似文献
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