نتایج جستجو برای: branching

تعداد نتایج: 27605  

Journal: :journal of current ophthalmology 0
مهدی نیلی احمدآبادی mehdi nili ahmadabadi فاطمه سادات روح الامینی fatemeh sadat rooholamini محمد ریاضی اصفهانی mohammad riazi esfahani رضا کارخانه reza karkhaneh

purpose : to determine the association between retinal vascular diameter and its branching angles with diabetic retinopathy (dr) stages in diabetic patients methods : a descriptive analytic cross-sectional study was conducted in 62 diabetic patients (120 eyes) referred to farabi eye hospital between june 2008 and december 2009. digital fundus photography pictures were imported into photoshop so...

2017
Vishukumar Aimanianda Catherine Simenel Cecile Garnaud Cecile Clavaud Rui Tada Lise Barbin Isabelle Mouyna Christoph Heddergott Laura Popolo Yoshikazu Ohya Muriel Delepierre Jean-Paul Latge

β-(1,3)-Glucan, the major fungal cell wall component, ramifies through β-(1,6)-glycosidic linkages, which facilitates its binding with other cell wall components contributing to proper cell wall assembly. Using Saccharomyces cerevisiae as a model, we developed a protocol to quantify β-(1,6)-branching on β-(1,3)-glucan. Permeabilized S. cerevisiae and radiolabeled substrate UDP-(14C)glucose allo...

2017
Kshitij Gajjar Jaikumar Radhakrishnan

We consider the problem of finding small distance-preserving subgraphs of undirected, unweighted interval graphs with k terminal vertices. We prove the following results. 1. Finding an optimal distance-preserving subgraph is NP-hard for general graphs. 2. Every interval graph admits a subgraph with O(k) branching vertices that approximates pairwise terminal distances up to an additive term of +...

Journal: :The American naturalist 2000
Michael Doebeli Ulf Dieckmann

Evolutionary branching occurs when frequency-dependent selection splits a phenotypically monomorphic population into two distinct phenotypic clusters. A prerequisite for evolutionary branching is that directional selection drives the population toward a fitness minimum in phenotype space. This article demonstrates that selection regimes leading to evolutionary branching readily arise from a wid...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2004
Erik W Dent Aileen M Barnes Fangjun Tang Katherine Kalil

In many CNS pathways, target innervation occurs by axon branching rather than extension of the primary growth cone into targets. To investigate mechanisms of branch formation, we studied the effects of attractive and inhibitory guidance cues on cortical axon branching. We found that netrin-1, which attracts cortical axons, and FGF-2 increased branching by >50%, whereas semaphorin 3A (Sema3A), w...

Journal: :رستنیها 0
فرخ قهرمانی نژاد استاد گروه علوم گیاهی، دانشکده علوم زیستی، دانشگاه خوارزمی، تهران، ایران ([email protected]) امین زراعتکار دانشجوی دکتری سیستماتیک گیاهی، گروه علوم گیاهی، دانشکده علوم زیستی، دانشگاه خوارزمی، تهران، ایران احسان حسینی دانشجوی دکتری سیستماتیک گیاهی، گروه علوم گیاهی، دانشکده علوم زیستی، دانشگاه خوارزمی، تهران، ایران آرزو ابراهیم نیا دانش آموخته کارشناسی ارشد سیستماتیک گیاهی، گروه علوم گیاهی، دانشکده علوم زیستی، دانشگاه خوارزمی، تهران، ایران

a new species from iran is described and illustrated here as kickxia iranica (plantaginaceae). kickxia iranica is morphologically similar to k. commutata, a species native to mediterranean region, however it can be distinguished from the latter by leaf shape, color of corolla, habit, stem branching and length of leaf, petiole, pedicel and corolla. notes on its distribution, ecology and phenolog...

2008
E. Katzav M. Adda - Bedia R. Arias

The problem of dynamic symmetric branching of a tensile crack propagating in a brittle material is studied within Linear Elastic Fracture Mechanics theory. The Griffith energy criterion and the principle of local symmetry provide necessary conditions for the onset of dynamic branching instability and for the subsequent paths of the branches. The theory predicts a critical velocity for branching...

2017
Alexis Boukouvalas James Hensman Magnus Rattray

High-throughput single-cell gene expression experiments can be used to uncover branching dynamics in cell populations undergoing differentiation through use of pseudotime methods. We develop the branching Gaussian process (BGP), a non-parametric model that is able to identify branching dynamics for individual genes and provides an estimate of branching times for each gene with an associated cre...

2013
Timo Berthold Domenico Salvagnin

Branch-and-bound methods for mixed-integer programming (MIP) are traditionally based on solving a linear programming (LP) relaxation and branching on a variable which takes a fractional value in the (single) computed relaxation optimum. In this paper we study branching strategies for mixed-integer programs that exploit the knowledge of multiple alternative optimal solutions (a cloud) of the cur...

2014
Brendan Murphy Jacek Czerwonka Laurie Williams

The development of software products are often managed through the use of Version Control Systems (VCS). VSCs allow for versioning of source code and manage the process of merging newly developed code into the product primarily through the use of branches. The branching architecture and the development processes used by the product groups are inter-related and have often evolved over many relea...

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