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Orthokinetic and klinokinetic responses of human polymorphonuclear leucocytes (1985)

Keller, H. U. ; Zimmermann, A.

New York, NY : Wiley-Blackwell

Cell Motility and the Cytoskeleton 5 (1985), S. 447-461

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ISSN: 0886-1544

Keywords: chemokinesis ; orthokinesis ; klinokinesis ; polymorphonuclear leucocytes ; locomotion ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: Evidence is presented to show that klinokinesis, which was previously demonstrated in bacteria and amoeba only, may also occur in metazoan cells. The chemotactic peptide formyl-Met-Leu-Phe (fMLP) elicited orthokinetic and klinokinetic responses of human blood-borne polymorphonuclear leucocytes (PMNs) under the test conditions used. Increased speed (orthokinesis) was due to an increase in the proportion of migrating cells as well as in the speed of the locomoting subset. The klinokinetic effect was manifested by a decrease in the klinolocomotion index, the mean angle of changes in direction ≥ 90°, and the frequency of turns ≥ 90°. The klinolocomotion index was inversely related to speed. This explains the synergistic effect of klinokinesis and orthokinesis in this system. Colchicine alone had and orthokinetic effect which was exclusively due to alterations in the proportion of migrating cells and it altered the turning behaviour without exerting a klinokinetic effect. However, colchicine had marginal orthokinetic and klinokinetic effects on fMLP-stimulated cells resulting in reduced translocation. The relationship between klinokinesis and mean angle or frequency of turns has been analysed. Klinokinesis was a substantial though not the major element of the chemokinetic response to fMLP under the conditions used. No other metazoan cells have been shown to possess such a complete pattern of responses, including orthokinesis, klinokinesis, and chemotaxis, which regulate locomotion.

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/cm.970050603

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Das Korrosionsverhalten von Titan in Salpetersäure hoher Temperaturen (1964)

Keller, H. ; Risch, K.

Weinheim [u.a.] : Wiley-Blackwell

Materials and Corrosion/Werkstoffe und Korrosion 15 (1964), S. 741-743

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ISSN: 0947-5117

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Description / Table of Contents: The corrosion resistance of titanium in nitric acid of high temperaturesCorrosion tests showed that, in nitric acid of a concentration ranging from 20 to 70 percent. and at temperatures ranging from 190 to 230° C, titanium has a corrosion rate of between 1 and 10mm pr. annum. This high corrosion rate can be avoided if a substance containing silicon is added to the nitric acid.

Notes: Korrosionsversuche ergaben, daß Titan in Salpetersäure der Konzentrationen 20 bis 70% bei Temperaturen von 190 bis 230° C rnit Geschwindigkeiten zwischen 1 bis 10 mm/Jhr. abgetragen wird. Diese starke Korrosion läßt sich unterbinden, wenn der Salpetersäure eine siliciumhaltige-Substanz zugesetzt wird.

Additional Material: 2 Ill.