Results 281 to 290 of about 260,357 (315)
Science, 1966 Motile Escherichia coli placed at one end of a capillary tube containing an energy source and oxygen migrate out into the tube in one or two bands, which are clearly visible to the naked eye and can also be demonstrated by photography, microscopy, and densitometry and by assaying for bacteria throughout the tube ...
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European Journal of Protistology, 1990
Chemotaxis - that is oriented locomotion of single cells - was shown by motion analysis of Tetrahymena thermophila. An electronic registration of swimming tracks was carried out in gradients of chemoattractant established in a modified Zigmond chamber. The attractants used were proteose peptone, platelet extract and fibroblast growth factor.
Per Hellung-Larsen +3 more
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Chemotaxis - that is oriented locomotion of single cells - was shown by motion analysis of Tetrahymena thermophila. An electronic registration of swimming tracks was carried out in gradients of chemoattractant established in a modified Zigmond chamber. The attractants used were proteose peptone, platelet extract and fibroblast growth factor.
Per Hellung-Larsen +3 more
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Experientia, 1968
It is the purpose of this review to provide a survey of some more recent work on chemotaxis of leucocytes. Attention was drawn to the existence of a variety of cytotaxins (chemotactic mediators) and in particular to their cell specificity. The significance of these different cytotaxins for the accumulation of leucocytes in inflammatory sites in vivo is
H. U. Keller, E. Sorkin
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It is the purpose of this review to provide a survey of some more recent work on chemotaxis of leucocytes. Attention was drawn to the existence of a variety of cytotaxins (chemotactic mediators) and in particular to their cell specificity. The significance of these different cytotaxins for the accumulation of leucocytes in inflammatory sites in vivo is
H. U. Keller, E. Sorkin
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Journal of Theoretical Biology, 1971
Abstract The chemotactic response of unicellular microscopic organisms is viewed as analogous to Brownian motion. Local assessments of chemical concentrations made by individual cells give rise to fluctuations in path. When averaged over many cells, or a long time interval, a macroscopic flux is derived which is proportional to the chemical gradient.
Lee A. Segel, Evelyn Fox Keller
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Abstract The chemotactic response of unicellular microscopic organisms is viewed as analogous to Brownian motion. Local assessments of chemical concentrations made by individual cells give rise to fluctuations in path. When averaged over many cells, or a long time interval, a macroscopic flux is derived which is proportional to the chemical gradient.
Lee A. Segel, Evelyn Fox Keller
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Nature, 1975
LYMPHOCYTES are motile cells whose movement in vivo seems to be directed, yet investigators over many years have repeatedly failed to show chemotaxis of lymphocytes in vitro. There have been some recent reports that lymphocytes migrate into micropore filters towards substances placed below the filter1–3, but this migration was not found to be ...
Russell, R J +3 more
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LYMPHOCYTES are motile cells whose movement in vivo seems to be directed, yet investigators over many years have repeatedly failed to show chemotaxis of lymphocytes in vitro. There have been some recent reports that lymphocytes migrate into micropore filters towards substances placed below the filter1–3, but this migration was not found to be ...
Russell, R J +3 more
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Annual Review of Physiology, 1982
Dictyostelium discoideum exists as single amoeboid cells during the first phase of its developmental cycle. These cells phagocytose bacteria. Chemo taxis to compounds released from the bacteria (e.g. folic acid) is probably involved in food seeking (95).
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Dictyostelium discoideum exists as single amoeboid cells during the first phase of its developmental cycle. These cells phagocytose bacteria. Chemo taxis to compounds released from the bacteria (e.g. folic acid) is probably involved in food seeking (95).
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Annual Review of Biophysics and Bioengineering, 1975
Bacteria swim by rotating their flagella. They alter course by abruptly changing the direction of this rotation. The probability of the occurrence of this event is biased by chemoreception. The bias depends on the way in which the concentration of the attractant or repellent changes with time. Sugars are detected as they bind to specific proteins which
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Bacteria swim by rotating their flagella. They alter course by abruptly changing the direction of this rotation. The probability of the occurrence of this event is biased by chemoreception. The bias depends on the way in which the concentration of the attractant or repellent changes with time. Sugars are detected as they bind to specific proteins which
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Dominance of chemotaxis in a chemotaxis–haptotaxis model
Nonlinearity, 2014This paper deals with the Neumann problem for the coupled chemotaxis–haptotaxis model of cancer invasion given byfor x ∈ Ω and t > 0 with, respectively, given nonnegative initial data u0 and w0, where χ, ξ and μ are positive parameters, Ω is a bounded domain in , and n ≥ 1, with smooth boundary.The goal of this work is to identify two parallels between
Youshan Tao, Michael Winkler
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Archives of Microbiology, 1976
The chemotactic properties of spores of Actinoplanes brasiliensis were examined. The spores are attracted to chloride and bromide solutions but not to a number of organic compounds that are capable of supporting growth in chemically defined media. Chloride attraction has been tested in several other species of the genus and in a number of Actinoplanes ...
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The chemotactic properties of spores of Actinoplanes brasiliensis were examined. The spores are attracted to chloride and bromide solutions but not to a number of organic compounds that are capable of supporting growth in chemically defined media. Chloride attraction has been tested in several other species of the genus and in a number of Actinoplanes ...
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Phosphoinositides in Chemotaxis
2012Phosphatidylinositol lipids generated through the action of phosphinositide 3-kinase (PI3K) are key mediators of a wide array of biological responses. In particular, their role in the regulation of cell migration has been extensively studied and extends to amoeboid as well as mesenchymal migration.
Carole A. Parent, Michael C. Weiger
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