BACKGROUND The current study aimed to detect the presence of Helicobacter pylori in some water systems in Egypt as well as in blood samples of patients suffering from stomach ulcers. METHODS Fifty-one water samples collected from some Egyptian governorates; Giza, Alexandria, Monofia, Beheira, Minya, Sohag, was subjected to physical and chemical analysis. Urease gene ureC, a highly specific se...

Combined physical and genetic maps of the genomes of Actinobacillus pleuropneumoniae AP76 (serotype 7 clinical isolate) and of A. pleuropneumoniae ATCC 27088 (serotype 1 reference strain) were constructed by using the restriction endonucleases ApaI, AscI, NotI, and SalI. The chromosome sizes as determined by the addition of estimated fragment sizes were 2.4 Mbp, and both maps had a resolution o...

يهدف البحث إلى دراسة ألفاظ تنتمي حقل دلالي خاص، وهو الألفاظ الدالة على: الأشياء النافعة والضرورية التي تسهل الحياة وتحسنها كالأدوات والأثاث، ويقتصر على استعملت ضمن لغة القرآن الكريم، فقد عبّر عن هذا المعنى أربعة (أثاث، رحْل، متاع، ماعون)، فالبحث هو دلالية الهدف منها تبيين الفروق الدلالية بين تلك تتوافق في مقولة واحدة عامّة، وقد درسنا ذلك من خلال المنهجَيْن الدلاليين: منهج الحقول الدلالية، ومنهج التأ...

شته مومی کلم (Brevicoryne brassicae L.)، یکی از آفات کلیدی و اقتصادی گیاهان خانواده چلیپائیان در جهان می‌باشد که اثرات مخربی بر روی کلزا (Brassica napus به همراه داشته است. این تحقیق، منظور تخمین دقیق جمعیت کلم، سه روش نمونه‌برداری (عکس‌برداری، اندازه‌گیری میانگین طول ساقه آلوده وزنی شته)‌ عنوان تیمارهای اصلی با شمارش مستقیم تیمار شاهد مرحله غنچه‌دهی، گل‌دهی غلاف‌دهی طور جداگانه، مورد مقایسه قر...

Most members of the genus Brucella show strong urease activity. However, the role of this enzyme in the pathogenesis of Brucella infections is poorly understood. We isolated several Tn5 insertion mutants deficient in urease activity from Brucella abortus strain 2308. The mutations of most of these mutants mapped to a 5.7-kbp DNA region essential for urease activity. Sequencing of this region, d...

Comparisons of in vivo (mouse stomach) and in vitro (laboratory culture) transcriptomes of Lactobacillus reuteri strain 100-23 were made by microarray analysis. These comparisons revealed the upregulation of genes associated with acid tolerance, including urease production, in the mouse stomach. Inactivation of the ureC gene reduced the acid tolerance of strain 100-23 in vitro, and the mutant w...