منابع مشابه
A Symmetrical, Extracellular Fibril
Symmetrical, extracellular fibrils, which are related to the "special fibrils" of the dermis described by Palade and Farquhar, have been found along the outer surface of the basement membrane covering the notochord in the tail of Rana catesbeiana (bullfrog) tadpoles. The fibrils are approximately 7,500 A long and occur singly or in clusters. The single fibrils are characterized by a symmetrical...
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We give three proofs for the following symmetrical identity involving binomial coefficients ( n m ) and Eulerian numbers 〈 n m 〉 : ∑ k ( a + b k ) 〈 k a − 1 〉 = ∑ k ( a + b k ) 〈 k b − 1 〉 for any positive integers a and b (where we take 〈 0 0 〉 = 0). We also show how this fits into a family of similar (but more complicated) identities for Eulerian numbers.
متن کاملA "new" Connective Tissue Fibril
By LEONARD ORNSTEIN (From the Cell Research Laboratory, Mount Sinai Hospital, and the Department of Zoology, Columbia University, New York) PLATE 94 In the course of studies involving the kidneys, ovaries, and pancreas of the tadpole of the frog (Rana clamitans and Rana pipiens) we have noted that the fibrous component of the connective tissues of the serosa, adventitia, and the supporting stro...
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The formation of collagen fibrils, fibril bundles, and tissue-specific collagen macroaggregates by chick embryo tendon fibroblasts was studied using conventional and high voltage electron microscopy. During chick tendon morphogenesis, there are at least three extracellular compartments responsible for three levels of matrix organization: collagen fibrils, bundles, and collagen macroaggregates. ...
متن کاملClaudin extracellular domains determine paracellular charge selectivity and resistance but not tight junction fibril architecture.
Tight junctions (TJs) regulate paracellular permeability across epithelia and vary widely in their transepithelial electrical resistance (TER) and charge selectivity. The claudin family of transmembrane proteins influences these properties. We previously reported that claudin-4 increased TER approximately 300% when expressed in low-resistance Madin-Darby canine kidney (MDCK) II cells and decrea...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 1969
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.42.2.418