نتایج جستجو برای: مدل اقتصادسنجی ecm

تعداد نتایج: 131013  

Journal: :Proceedings. Biological sciences 2012
Martin Ryberg P Brandon Matheny

The ectomycorrhizal (ECM) symbiosis is the most widespread biotrophic nutritional mode in mushroom-forming fungi. ECM fungi include, though are not limited to, about 5000 described species of Agaricales from numerous, independently evolved lineages. Two central hypotheses suggest different explanations for the origin of ECM fungal diversity: (i) dual origins, initially with the Pinaceae in the ...

Journal: :Juntendo Medical Journal 2023

Objectives The mechanisms of mental and neurological diseases have been proposed to be related not only disorders the neurons but also environment surrounding neurons, such as glial cells extracellular matrix (ECM). chondroitin sulfate (CS) chain, which comprises CS proteoglycans (CSPGs), is one major sulfated glycosaminoglycans in brain. CSPGs play an important role development, aging, patholo...

گاهی در اقتصادسنجی مشاهدات مورد مطالعه مستقل نیستند و وابستگی آن‌ها ناشی از موقعیت قرار گرفتن مشاهدات در فضای مورد مطالعه است. برای تحلیل این نوع از داده­ها از مدل­های رگرسیونی فضایی استفاده می­شود. به دلیل وجود تعداد زیاد پارامتر در این مدل­ها، برای به دست آوردن برآوردهای ماکسیمم درستنمایی از الگوریتم‌های تکرار شونده استفاده می­شود که با مشکل پیچیدگی محاسبات مواجه است. علاوه بر این در مطالعات ...

2012
S. Tamir Rashid Jonathan D. Humphries Adam Byron Ameet Dhar Janet A. Askari Julian N. Selley David Knight Robert D. Goldin Mark Thursz Martin J. Humphries

Activation of hepatic stellate cells (HSCs) and subsequent uncontrolled accumulation of altered extracellular matrix (ECM) underpin liver fibrosis, a wound healing response to chronic injury, which can lead to organ failure and death. We sought to catalogue the components of fibrotic liver ECM to obtain insights into disease etiology and aid identification of new biomarkers. Cell-derived ECM wa...

Journal: :Blood 1993
M Benezra I Vlodavsky R Ishai-Michaeli G Neufeld R Bar-Shavit

The angiogenic factor, basic fibroblast growth factor (bFGF), is sequestered and protected by binding to heparan sulfate proteoglycans (HSPG) in the subendothelial extracellular matrix (ECM). Release of ECM-bound bFGF provides a novel mechanism for regulation of cell proliferation and neovascularization in normal and pathologic situations. Exposure of ECM to thrombin, the final activation produ...

2017
Jiankai Wei Guilin Wang Xiang Li Ping Ren Haiyan Yu Bo Dong

The extracellular matrix (ECM) not only provides essential physical scaffolding for cellular constituents but also initiates crucial biochemical and biomechanical cues that are required for tissue morphogenesis. In this study, we utilized wheat germ agglutinin (WGA) staining to characterize the ECM architecture in ascidian embryos and larvae. The results showed three distinct populations of ECM...

Journal: :American journal of physiology. Cell physiology 2007
Jane Sottile Feng Shi Inna Rublyevska Hou-Yu Chiang Joseph Lust Jennifer Chandler

Communication between cells and the extracellular matrix (ECM) is critical for regulation of cell growth, survival, migration, and differentiation. Remodeling of the ECM can occur under normal physiological conditions, as a result of tissue injury, and in certain pathological conditions. ECM remodeling leads to alterations in ECM composition and organization that can alter many aspects of cell ...

2017
Vahid Akbarinejad Parviz Tajik Mansoureh Movahedin Reza Youssefi

Testosterone is believed to play a significant role in spermatogenesis, but its contribution to the process of spermatogenesis is not completely understood. Given that extracellular matrix (ECM) facilitates differentiation of spermatogonial stem cells (SSCs) during culture, the present study was conducted to elucidate whether testosterone contribute to the permissive effect of ECM on SSCs diffe...

Journal: :Decision Support Systems 2006
Se-Joon Hong James Y. L. Thong Kar Yan Tam

This study examines the utility of three prospective models for understanding the continued IT usage behavior. The three models include: Expectation-Confirmation Model in IT Domain (ECM-IT), Technology Acceptance Model (TAM), and a hybrid model integrating TAM and ECM-IT (extended ECM-IT). Based on a survey of 1826 mobile Internet users, the LISREL analysis shows that all three models meet the ...

  هدف اصلی این پژوهش، بررسی تأثیر عملکرد بازار، هزینه‌های تبلیغات و نوآوری بر درجه تمرکز در صنایع تولید مواد غذایی و آشامیدنی ایران است. بدین منظور از داده‌‌ها و اطلاعات مربوط به کارگاه‌‌های صنعتی با 10 نفر کارکن و بالاتر تولیدکننده محصولات مواد غذایی و آشامیدنی ایران در سال‌های 1374-1388 استفاده کرده و مدل اقتصادسنجی را با استفاده از روش داده‌‌های تابلویی پویا برآورد کرده‌ایم. در این مقاله از ...

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