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Digitale Medien

Avian scale development. Absence of an “epidermal placode” in reticulate scale morphogenesisAided by Biology Department, University of South Carolina, Columbia, South Carolina. (1977)

Sawyer, R. H. ; Craig, K. F.

New York, NY : Wiley-Blackwell

Journal of Morphology 154 (1977), S. 83-93

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Timed-sequence studies have shown that reticulate scales on the ventral footpads of birds do not undergo “epidermal placode” formation during their morphogenesis, but arise as symmetrical evaluations similar to the scales of snakes and lizards. Unlike the scutellate scales on the dorsal surface of the foot, in which the formation of an “epidermal placode” and its subsequent morphogenesis result in distinct outer and inner epidermal surfaces, the reticulate scales elaborate only one type of epidermal surface.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1051540106

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Digitale Medien

Resonant AC-DC magnetic fields: Calculated response (1988)

Durney, Carl H. ; Rushforth, Craig K. ; Anderson, Allen A.

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 9 (1988), S. 315-336

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ISSN: 0197-8462

Schlagwort(e): ELF ; cyclotron resonance ; model ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Physik

Notizen: An elementary model consisting of one charged particle in a viscous medium exposed to weak ac-dc low-frequency magnetic fields is analyzed to identify and explain the fundamental characteristics of the physical mechanisms that result in a resonance response, which is similar to the familiar cyclotron resonance. The model predicts both frequency and amplitude windows, which are explained in terms of synchronization of the particle with electric fields. Although extrapolation of model results to biological systems is limited by the elementary nature of the model, the model results indicate that observed resonant responses by others of biological systems to ac-dc magnetic fields are probably not due to resonant response of ions in solution, since the model predicts that no resonant response is possible unless the viscous damping is very low, many orders of magnitude lower than the viscous damping of ions in solution.

Zusätzliches Material: 16 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bem.2250090402

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