نتایج جستجو برای: minor β
تعداد نتایج: 258041 فیلتر نتایج به سال:
We give constant-factor approximation algorithms for branch-decomposition of planar graphs. Our main result is an algorithm which for an input planar graph G of n vertices and integer k, in O(n log n) time either constructs a branch-decomposition of G with width at most (2 + δ)k, δ > 0 is a constant, or a (k + 1)× ⌈ 2 ⌉ cylinder minor of G implying bw(G) > k, bw(G) is the branchwidth of G. This...
آلکیل دار کردن ترکیبات β- دی کربونیل یکی از رایج ترین روش ها برای ساخت پیوند c-c به عنوان یک راهکار اساسی برای تولید طیف گسترده ای از حد واسط های سنتزی ارزشمند است، که در تولید ترکیبات عامل دار، محصولات طبیعی و مواد دارویی در سنتز های آلی مورد استفاده است. در سال های گذشته ،در میان انواع روش ها ی آلکیل دار کردن ترکیبات β- دی کربونیل، افزایش مستقیم ترکیبات β- دی کربونیل به الکل ها (تهیه ترکیبات ...
Avian polyomavirus (APV) causes a fatal, multi-organ disease among several bird species. Using cryogenic electron microscopy and other biochemical techniques, we investigated the structure of APV and compared it to that of mammalian polyomaviruses, particularly JC polyomavirus and simian virus 40. The structure of the pentameric major capsid protein (VP1) is mostly conserved; however, APV VP1 h...
BACKGROUND Tea seed oil is a high quality edible oil, yet lacking sufficient scientific evidences to support the nutritional and medical purposes. We identified major and minor components in Camellia tenuifolia seed oil and investigated the antioxidative activity and its underlying mechanisms in Caenorhabditis elegans. PRINCIPAL FINDINGS The results showed that the major constitutes in C. ten...
Purpose Total knee arthroplasty (TKA) is increasing in frequency and cost. Optimization of discharge location may reduce total expenditure while maximizing patient outcomes. Although preoperative illness rating systems-including the American Society for Anesthesiologists Physical Classification System (ASA), severity of illness scoring system (SOI), and Mallampati rating scale (MP)-are associat...
We establish two sufficient conditions for the stability of a P -matrix. First, we show that a P -matrix is positive stable if its skew-symmetric component is sufficiently smaller (in matrix norm) than its symmetric component. This result generalizes the fact that symmetric P -matrices are positive stable, and is analogous to a result by Carlson which shows that sign symmetric P -matrices are p...
Lemna minor L. has been traditionally used for a long time its analgesic, antipyretic, vitamin C supplement, astringent, antipruritic effects. Although there are many heavy metal removals using minor, unfortunately, biological activity studies very limited. In this study, the chemical content and total phenol content, DPPH removal, chelation (Fe2+) β-Carotene-lycopene methods of macrophyte we o...
Isoprenoids are a large and diverse group of metabolites with interesting properties such as flavour, fragrance and therapeutic properties. They are produced via two pathways, the mevalonate pathway or the 2-C-methyl-D-erythritol-4-phosphate (MEP) pathway. While plants are the richest source of isoprenoids, they are not the most efficient producers. Escherichia coli and yeasts have been extensi...
ABSTRACT Background and objectives: This study aimed to characterize the spectrum of β-thalassemia mutations and haplotypes of sickle cell anemia in Beja tribes and other minor groups living in Port Sudan, Sudan. Methods: This descriptive cross-sectional study was carried out from March 2011 to July 2013. Overall, 209 anemic patients were screened for hemoglobinopathy ...
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