The level of the vitamin B12 transport protein BtuB in the outer membrane of Escherichia coli is strongly reduced by growth in the presence of cobalamins. Previous analyses of regulatory mutants and of btuB-lacZ fusions indicated that the primary site of btuB gene regulation was at the translational level, and this required sequences throughout the 240-nucleotide (nt) leader region. Cobalamin-d...

a r t i c l e i n f o The distribution of mountain permafrost along Trail Ridge Road (TRR) in Rocky Mountain National Park, Colorado, was modeled using 'frost numbers' and a 'temperature of permafrost model' (TTOP) in order to assess the accuracy of prediction models. The TTOP model is based on regional observations of air temperature and heat transfer functions involving vegetation, soil, and ...

We present extremal constructions connected with the property of simplicial collapsibility. (1) For each d ≥ 2, there are collapsible (and shellable) simplicial d-complexes with only one free face. Also, there are non-evasive d-complexes with only two free faces. (Both results are optimal in all dimensions.) (2) Optimal discrete Morse vectors need not be unique. We explicitly construct a contra...

Convolutional neural networks (CNNs) have been widely utilized to identify hand gestures from surface electromyography (sEMG) signals. However, due the nonstationary characteristics of sEMG, classification accuracy usually degrades significantly in daily living environment involving complex movements. To further improve reliability a classifier, unconfident classifications are expected be ident...

در پژوهش حاضر به بررسی امکان تولید رادیونوکلید لوتسیوم-177، Lu177، رآکتور تحقیقاتی تهران، TRR، پرداخته شده است. Lu177 با داشتن ویژگی‏های واپاشی هسته‏ای مناسب و هم‏چنین رفتار شیمیایی مطلوب، یک ایده‏آل جهت تهیه رادیوداروهای درمانی برخی از حاوی حال کشور درمان انواع سرطان استفاده می‏شود بسیاری آن­ها تحت آزمایشات بالینی هستند. را می‏توان یا مستقیماً طریق واکنش Lu177Lu(n,γ)176 طور غیرمستقیم طی کرد. با...