Results 201 to 210 of about 19,205 (235)
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Isolated spermatogonia protrude active pseudopodia in vitro
Fertility and Sterility, 2008When dispersed spermatogenic cells obtained by enzymatic digestion from prepuberal mice, adult male mice, nonazoospermic men and normospermic men were observed live using Normarski optics, it was found that, respectively, 47.4%, 1.4%, 5.1%, and 2.4% of them protruded active pseudopodia.
Atsushi, Tanaka +5 more
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Methods for Pseudopodia Purification and Proteomic Analysis
Science's STKE, 2007Directional cell migration requires the formation of a dominant pseudopodium in the direction toward which the cell migrates. When a migratory cell is stimulated with a chemoattractant or extracellular matrix (ECM) gradient, it responds with localized amplification of signals on the side facing the gradient.
Yingchun, Wang +7 more
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Pseudopodia formation by neurosecretory granules
Cell and Tissue Research, 1977Ultrastrucal studies of the mouse neurohypophysis, under various experimental conditions, revealed a number of neurosecretory granules (NSG) bearing single pseudopodia-like protrusions. Some NSG adhered to the axolemma via pseudopodia; other NSG, distant from the axolemma, budded electron lucent microvesicles from the tip of the pseudopod.
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Feeding in a Calcareous Sponge: Particle Uptake by Pseudopodia
The Biological Bulletin, 2006Sponges are considered to be filter feeders like their nearest protistan relatives, the choanoflagellates. Specialized "sieve" cells (choanocytes) have an apical collar of tightly spaced, rodlike microvilli that surround a long flagellum. The beat of the flagellum is believed to draw water through this collar, but how particles caught on the collar are
Sally P, Leys, Dafne I, Eerkes-Medrano
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Biochemical Purification of Pseudopodia from Migratory Cells
2007Cell migration requires the formation of a leading pseudopodium (lamellipodium) in the direction of movement. This process requires signal amplification to facilitate directional sensing mechanisms that lead to actin-mediated membrane extension. However, it has been difficult to study pseudopodia formation because it has not been possible to purify ...
Yingchun, Wang, Richard L, Klemke
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Pore Pseudopodia and Sieve Plates of Amphistegina
Micropaleontology, 1972Pseudopodia (thinner than apertural pseudopodia) pass through perforations in sieve plates, form bundle of fine pseudopodia; sieve plates resemble spongy organic material separating secondary lamellae, living culture, SEM and TEM photomicrographs ...
Hans Jørgen Hansen, Hans Jorgen Hansen
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Guiding cell migration through directed extension and stabilization of pseudopodia
Experimental Cell Research, 2004Cell migration requires establishment of a single pseudopodium in the direction of movement. Here we highlight recent advances in our understanding of the molecular signaling mechanisms that regulate formation of pseudopodia. We discuss how signal transduction processes are spatially and temporally organized to establish cell polarity through directed ...
David, Chodniewicz, Richard L, Klemke
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Self-organizing cytoplasmic microtubule networks in foraminiferan pseudopodia
Proceedings, annual meeting, Electron Microscopy Society of America, 1992The foraminifera (i.e. “forams”), like all Granuloreticulose protists, produce extensive networks of pseudopodia that are supported and powered by an elaborate cytoskeleton of motile microtubules (MT). These pseudopodia may reach lengths nearly 100X the diameter of the cell body, which is the synthetic center of the cell, and the network is ...
Elizabeth Patterer Welnhofer +3 more
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Pseudopodia of choriocapillary endothelium.
Japanese journal of ophthalmology, 1989The electron microscopic observation of Bruch's membrane of the macular area was performed in 12 human eyes, from newborn to 77-year-old subjects. In all the eyes examined the choriocapillary endothelial cells were observed to project pseudopodia through defects in the endothelial basement membrane.
T, Yamamoto, H, Yamashita
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Analogy between Pseudopodia and Nerve Fibres
Nature, 1944A GOOD many years ago, Verworn1 developed in some detail a supposed analogy between rhizopod pseudopodia and nerve fibres. He suggested that these represent two extreme types of living substance in which the effects of stimulation are transmitted respectively with and without decrement.
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