北极地区终年寒冷,人迹罕至,但其独特的气候环境中仍有许多未知的新物种有待人类的发现.本研究对分离自北极冰川前沿土壤样品的一株深红色细菌(M6-79T)进行多相分类学的研究,菌株M6-791细胞为革兰氏阴性,杆状,无芽孢,不运动,严格好氧.在营养琼脂培养基上20℃培养7天,菌落呈圆形、深红色并凸起;M6-79T能在4℃正常生长,最适生长温度为18-20℃;最适pH为6.0-8.0;氧化酶和过氧化氢酶均呈阴性.全细胞脂肪酸分析其主要含有Summed in feature 8(C18∶1 ω7c)、C16∶o和Summed in feature 3;主要醌型为Q-9;其极性脂主要有磷脂酰乙醇胺、磷脂酰甘油、双磷脂酰甘油、磷脂酰胆碱和一个未知的氨基脂类.依据其16S rRNA基因序列比对结果建立系统进化树,将其聚类至Alphaproteobacteria门,Roseomonas属.M6-79T与已发表的Roseomonas aquatica TR53T相似性最高,相似度为95.41％.M6-79T拥有Roseomonas属的基本特征,但其生理生化等特征与其相似性较高的几株模式菌株亦有一定差异,经试验比较分析,我们将M6-79T定义为Roseomonas属的一个新种,命名为Roseomonas arctic,模式菌株为M6-79T (CCTCC AB 2013101).
Arsenic (As) is a natural and ubiquitous element present in many environmental biotopes and it is released through various natural processes and anthropogenic *** is a very toxic, carcinogenic, clastogenic and teratog...
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Arsenic (As) is a natural and ubiquitous element present in many environmental biotopes and it is released through various natural processes and anthropogenic *** is a very toxic, carcinogenic, clastogenic and teratogenic metalloid and chronic exposure to even low levels of arsenic results in ***, microorganisms have evolved multiple mechanisms for arsenic detoxification for long-term arsenic *** non-sulfur bacteria have a richness of metabolic versatility and a strong biodegradability.
Over the past two decades, the development of nanoscience and technology has created various nanostructures in forms such as nanoparticles, nanowires, and assembling *** the interaction and self-assembly of biomolecul...
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Over the past two decades, the development of nanoscience and technology has created various nanostructures in forms such as nanoparticles, nanowires, and assembling *** the interaction and self-assembly of biomolecule with metallic nanometer particles, the unique properties enable composite materials to have received considerable attention and been extensively investigated for applications in electronic, optoelectronic, photovoltaic, photocatalytic, and sensing devices.
Pathogenic bacteria adhesion to the host mucus represents the first crucial step in most *** many pathyogenic bacteria, only when they adhere in the sensitive cells or mucosal surfaces through adhesins, can they produ...
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Pathogenic bacteria adhesion to the host mucus represents the first crucial step in most *** many pathyogenic bacteria, only when they adhere in the sensitive cells or mucosal surfaces through adhesins, can they produce toxins in the focus or invade into deep tissues, eventual penetrate into the tissues of the ***, adhesion has been regarded as one of the virulence ***, most studies on bacteria adhesion focus on clinical pathogenic bacteria, hardly any fish pathogens have been studied to uncover the mechanisms of their adhesion.
Carotenoids are widely used in food, medical, pharmaceutical and cosmetics *** are naturally occurring pigments widely distributed among bacteria, yeasts, filamentous fungi, algae, plants and higher *** present, a lar...
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Carotenoids are widely used in food, medical, pharmaceutical and cosmetics *** are naturally occurring pigments widely distributed among bacteria, yeasts, filamentous fungi, algae, plants and higher *** present, a large market of pigments is actually satisfied through synthetic ***, in food and cosmetic industries, the application of chemically synthetic carotenoids is restricted because of their ***, commercial production of the carotenoids using carotenoids-produced microorganisms has been taken into considerations owing to its highly efficient and easy manipulation in processing schemes.
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