نتایج جستجو برای: الگوریتم sdf

تعداد نتایج: 25753  

Journal: :Development 1998
C Anjard W T Chang J Gross W Nellen

SDF-1 and SDF-2 are peptides that promote terminal spore differentiation under submerged conditions. The present study shows that they accumulate differentially and are released during the development of wild-type cells and can promote spore formation in cells disaggregated from wild-type culminants. SDF-1 accumulates during the slug stage and is released in a single burst at the onset of culmi...

2005
Sunanda Basu Hal E. Broxmeyer

Disruption of stromal cell-derived factor-1 (SDF-1/CXCL12 [CXC chemokine ligand 12]) interaction leads to mobilization of stem/ progenitor cells from bone marrow to circulation. However, prolonged exposure of CD34 cells to SDF-1 desensitizes them to SDF-1. So how do cells remain responsive to SDF-1 in vivo when they are continuously exposed to SDF-1? We hypothesized that one or more mechanisms ...

اسماعیلی ندیمی , علی, توکلیان فردوسیه , وحید, حسن شاهی راویز, غلام حسین, زارع رنجبر , حامد, عباسی, آرمین, وزیری نژاد , رضا,

Background and purpose: Çardiovascular diseases are the most common causes of death in Ïran as well as in the world. SDF-1a, as an effective chemokine for decreasing inflammation and injury, plays a role in angiogenesis. This study compares and evaluates serum level of this chemokine in healthy people and those with ÂMÏ (Âcute Myocardial Ïnfarction) regarding age and gender. Materials and me...

2017
Guo-Dong Wang Yi-Xun Liu Xiao Wang Yong-Le Zhang Ya-Dong Zhang Feng Xue

This study aims to explore the role of the SDF-1/CXCR4 axis in mediating BMSCs and SCI recovery. BMSCs were collected and SCI rat models were established. Wistar rats were assigned into the blank control, sham, SCI, SCI + BMSCs, SCI + BMSCs + SDF-1, SCI + BMSCs + AMD3100 (an inhibitor of SDF-1/CXCR4 axis) and SCI + BMSCs + SDF-1 + AMD3100 groups. Hind limb motor function was measured 7, 14, 21 ...

Journal: :The American journal of pathology 2010
Hiroki Otsuka Noboru Arimura Shozo Sonoda Makoto Nakamura Teruto Hashiguchi Ikuro Maruyama Shintaro Nakao Ali Hafezi-Moghadam Taiji Sakamoto

Stromal cell-derived factor-1 (SDF-1) causes chemotaxis of CXCR4-expressing bone marrow-derived cells. SDF-1 is involved in the pathogenesis of various vascular diseases, including those of the eye. However, the role of SDF-1 in neuronal diseases is not completely understood. Here, we show higher SDF-1 levels in the vitreous humor of patients with retinal detachment (RD) compared with normal pa...

2014
Chung-Jieh Wang Jen-Pi Tsai Shun-Fa Yang Jong-Da Lian Horng-Rong Chang

Although the genetic polymorphism of Stromal Cell-Derived Factor 1 (SDF-1) is associated with higher mortality of liver allograft recipients, the role of SDF-1 in the modulation of renal allograft outcomes is unclear. Between March 2000 and January 2008, we recruited 252 non-diabetic renal transplant recipients (RTRs). Baseline characteristics and blood chemistry were recorded. Genomic DNA extr...

Journal: :Journal of cell science 2010
Veysel Odemis Karina Boosmann André Heinen Patrick Küry Jürgen Engele

The alternative SDF-1 (stromal cell derived factor-1) receptor, CXCR7, has been suggested to act as either a scavenger of extracellular SDF-1 or a modulator of the primary SDF-1 receptor, CXCR4. CXCR7, however, also directly affects the function of various tumor-cell types. Here, we demonstrate that CXCR7 is an active component of SDF-1 signalling in astrocytes and Schwann cells. Cultured corti...

2017
Ahmad Majzoub Ashok Agarwal Chak-Lam Cho Sandro C. Esteves

BACKGROUND Sperm DNA fragmentation (SDF) testing has been recognized as a valuable tool in the evaluation of infertile men. Despite that, its routine use in clinical practice is still hampered by the lack of understanding of the specific clinical scenarios where SDF testing is most beneficial. The aim of this study was to investigate fertility specialists evaluation of infertility of SDF testin...

Journal: :Journal of immunology 2001
E R Fedyk D Jones H O Critchley R P Phipps T M Blieden T A Springer

Stromal-derived factor-1 (SDF-1) is a CXC chemokine that is believed to be constitutively expressed by stromal cells of numerous tissues. In this report, we demonstrate that dermal fibroblasts and vessels of noninflamed tissues express SDF-1. Unexpectedly, we found that expression of SDF-1 is regulated by inflammation. Expression of SDF-1 by primary cultures of human gingival fibroblasts is pot...

2011
Richard Beigel William Gasarch

A set A ⊆ N is square-difference free (henceforth SDF) if there do not exist x, y ∈ A, x 6= y, such that |x− y| is a square. Let sdf(n) be the size of the largest SDF subset of {1, . . . , n}. Ruzsa [10] has shown that proved sdf(n) ≥ Ω(nlog65 7) ≥ Ω(n0.733077···). sdf(n) = Ω(n65 ) = Ω(n0.733077···) We improve on the lower bound by showing sdf(n) = Ω(n205 ) = Ω(n0.7334···) As a corollary we obt...

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