نتایج جستجو برای: زیرواحد urec

تعداد نتایج: 366  

2017
Di Jin Shengguo Zhao Nan Zheng Dengpan Bu Yves Beckers Stuart E. Denman Christopher S. McSweeney Jiaqi Wang

Ureolytic bacteria are key organisms in the rumen producing urease enzymes to catalyze the breakdown of urea to ammonia for the synthesis of microbial protein. However, little is known about the diversity and distribution of rumen ureolytic microorganisms. The urease gene (ureC) has been the target gene of choice for analysis of the urea-degrading microorganisms in various environments. In this...

Journal: :Bioinformatics 2007
Pawel Górecki Jerzy Tiuryn

UNLABELLED URec is a software based on a concept of unrooted reconciliation. It can be used to reconcile a set of unrooted gene trees with a rooted species tree or a set of rooted species trees. Moreover, it computes detailed distribution of gene duplications and gene losses in a species tree. It can be used to infer optimal species phylogenies for a given set of gene trees. URec is implemented...

2015
Shengguo Zhao Jiaqi Wang Nan Zheng Dengpan Bu Peng Sun Zhongtang Yu

BACKGROUND Ureolytic activity of rumen bacteria leads to rapid urea conversion to ammonia in the rumen of dairy cows, resulting possible toxicity, excessive ammonia excretion to the environment, and poor nitrogen utilization. The present study investigated immunization of dairy cows against urease in the rumen as an approach to mitigate bacterial ureolytic activity therein. RESULTS Most alpha...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1995
J M Reyrat F X Berthet B Gicquel

The ureABC genes of Mycobacterium tuberculosis were cloned. By using a set of degenerate primers corresponding to a conserved region of the urease enzyme (EC 3.5.1.5), a fragment of the expected size was amplified by PCR and was used to screen a M. tuberculosis cosmid library. Three open reading frames with extensive similarity to the urease genes from other organisms were found. The locus was ...

2013
Rune Johannessen Kåre Bergh Constantin Jianu Per Martin Kleveland

In the management of Helicobacter pyloriinduced gastroduodenal disease, a pilot study at our hospital (St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway) revealed that culture often seemed to fail compared to the polymerase chain reaction (PCR). A more thorough evaluation was therefore undertaken. We included 201 patients referred to upper gastrointestinal endoscopy in the pe...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شاهد - دانشکده علوم پایه 1391

در طول دو دهه گذشته مخمرمتیلوتروفیک پیکیا پاستوریس به عنوان یکی از موفق ترین سیستم های بیانی جهت تولید انواعی از پروتئینهای نوترکیب مورد استفاده قرار گرفته است. این مخمر قابلیت انجام بسیاری از تغییرات پس از ترجمه ای یوکاریوتی مانند گلیکوزیلاسیون، تشکیل پیوندهای دی سولفیدی و در نتیجه فولدینگ صحیح پروتئین دارد. با وجود این مزایا، پیکیا پاستوریس می تواند یک جایگزین عالی برای سیستم بیانی اشرشیا کل...

Journal: :Diseases of aquatic organisms 2000
C R Osorio A E Toranzo J L Romalde J L Barja

A multiplex-PCR approach, employing 2 primer pairs directed to internal regions of the 16S rRNA and ureC genes, was utilized to analyze a collection of Photobacterium damselae strains, including 25 isolates of subspecies piscicida and 15 isolates of subspecies damselae. With this procedure, all the P. damselae subsp. damselae strains yielded 2 amplification products, one of 267 bp and the other...

Journal: :Archives of disease in childhood 2000
J R Kerr A Al-Khattaf A J Barson J P Burnie

BACKGROUND Helicobacter pylori has recently been detected in the stomach and trachea of cases of sudden infant death syndrome (SIDS) and proposed as a cause of SIDS. AIMS To establish the incidence of H pylori in the stomach, trachea, and lung of cases of SIDS and controls. METHODS Stomach, trachea, and lung tissues from 32 cases of SIDS and eight control cases were examined retrospectively...

Journal: :Microbiology 2000
K A Palinska T Jahns R Rippka N Tandeau De Marsac

The urease from the picoplanktonic oceanic Prochlorococcus marinus sp. strain PCC 9511 was purified 900-fold to a specific activity of 94.6 micromol urea min(-1) (mg protein)(-1) by heat treatment and liquid chromatography methods. The enzyme, with a molecular mass of 168 kDa as determined by gel filtration, is the smallest urease known to date. Three different subunits with apparent molecular ...

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