نتایج جستجو برای: invagination

تعداد نتایج: 1716  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1999
T Herman E Hartwieg H R Horvitz

By screening for mutations that perturb the invagination of the vulva of the Caenorhabditis elegans hermaphrodite, we have isolated 25 mutations that define eight genes. We have named these genes sqv-1 to sqv-8 (squashed vulva). All 25 mutations cause the same vulval defect, an apparent partial collapse of the vulval invagination and an elongation of the central vulval cells. Most sqv mutations...

Journal: :Archives of disease in childhood 1955
D MACAULAY T MOORE

Most writers on the subject claim that chronic intussusception is rare in childhood. Thus Still (1921) stated that in children it occurs 'rarely indeed'; Monrad (1927) wrote: 'Chronic invaginations in my experience are extremely rare in small children'; Beaven (1929) noted that 'judging from the number of cases reported, chronic intussusception is an extremely rare disease in children'; and Nyb...

2010
S. Khan

Introduction: Operation of appendix is very common abdominal surgery that is done by general surgeons. Some surgeon prefer to invaginate the appendix stump while others don’t. Aim of the study was to compare the technique of ligation and invagination of the appendix stump with simple ligation of the appendix stump during appendicectomy for acute appendicitis. Methods: A prospective comparative ...

Journal: :Development 2011
Timothy F Plageman Bharesh K Chauhan Christine Yang Fanny Jaudon Xun Shang Yi Zheng Ming Lou Anne Debant Jeffrey D Hildebrand Richard A Lang

Epithelial invagination is a common feature of embryogenesis. An example of invagination morphogenesis occurs during development of the early eye when the lens placode forms the lens pit. This morphogenesis is accompanied by a columnar-to-conical cell shape change (apical constriction or AC) and is known to be dependent on the cytoskeletal protein Shroom3. Because Shroom3-induced AC can be Rock...

Journal: :International journal of anatomy radiology and surgery 2023

Introduction: Surgical techniques in open appendicectomy has been evolving with most centers following simple ligation of appendix stump as the preferred approach including laparoscopic approach. Invagination is also practiced a traditional Aim: To compare and evaluate outcomes postoperative morbidity invagination techniques. Materials Methods: This was prospective observational study conducted...

Journal: :Development 2005
Atish Ganguly Jin Jiang Y Tony Ip

The maternal Toll signaling pathway sets up a nuclear gradient of the transcription factor Dorsal in the early Drosophila embryo. Dorsal activates twist and snail, and the Dorsal/Twist/Snail network activates and represses other zygotic genes to form the correct expression patterns along the dorsoventral axis. An essential function of this patterning is to promote ventral cell invagination duri...

2016
Jingjing Li Lemonia Chatzeli Eleni Panousopoulou Abigail S. Tucker Jeremy B. A. Green

Ectodermal organs, which include teeth, hair follicles, mammary ducts, and glands such as sweat, mucous and sebaceous glands, are initiated in development as placodes, which are epithelial thickenings that invaginate and bud into the underlying mesenchyme. These placodes are stratified into a basal and several suprabasal layers of cells. The mechanisms driving stratification and invagination ar...

Journal: :Journal of cell science 2011
Annalisa Letizia Sol Sotillos Sonsoles Campuzano Marta Llimargas

Many epithelial tissues undergo extensive remodelling during morphogenesis. How their epithelial features, such as apicobasal polarity or adhesion, are maintained and remodelled and how adhesion and polarity proteins contribute to morphogenesis are two important questions in development. Here, we approach these issues by investigating the role of the apical determinant protein Crumbs (Crb) duri...

2016
Vijay Kumar Jidigam

Cranial placodes are transient thickenings of the vertebrate embryonic head ectoderm that will give rise to sensory (olfactory, lens, and otic) and non-sensory (hypophyseal) components of the peripheral nervous system (PNS). In most vertebrate embryos, these four sensory placodes undergo invagination. Epithelial invagination is a morphological process in which flat cell sheets transform into th...

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