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A comparative study of the ultrastructure of the water-blood pathway in the secondary lamellae of teleost and elasmobranch fishes — benthic forms (1970)

Hughes, G. M. ; Wright, D. E.

Springer

Cell & tissue research 104 (1970), S. 478-493

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ISSN: 1432-0878

Keywords: Gills ; Respiratory epithelia ; Fishes ; Microvilli ; Mucus

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The ultrastructure of the secondary lamellae has been examined in four species of free-swimming elasmobranchs, two species of Raia and five species of bony flatfishes. Microvilli which are present on the outer epithelial surface vary in form and size. It is suggested that a possible function of the microvilli is to anchor a surface mucus covering whose possible functions are discussed. Vesicles are found immediately beneath the microvilli in elasmobranchs but not in teleosts. Chloride and mucous cells are present on the secondary lamellae of all species and often have microvilli of greater length than on the other cells of the epithelium. Micropinocytotic vesicles are found on both sides of the basement membrane. The number of columns enclosed in the pillar cells varied from 5–11. The water-blood pathway showed variations in thickness not only between different species but also in different parts of individual secondary lamellae. A general trend in the mean total thickness was found, being greater in the swimming elasmobranchs (10.22 μ) than in the rays (5.47 μ) and bony flatfish (3.59 μ). This trend is also seen in the greater length of microvilli and thickness of basement membrane in the elasmobranchs than in the teleosts.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00335372

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Kinetics of protein release from yeast sonicated in batch and flow systems at 20 kHz (1972)

James, C. J. ; Coakley, W. T. ; Hughes, D. E.

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

Biotechnology and Bioengineering 14 (1972), S. 33-42

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: The release constant, k, of brewers yeast sonicated at powers up to 200 W at 20 kHz has been shown to be independent of cell concentration up to values of 60 g made up to 100 ml. It is inversely proportional to the volume of the treatment vessel in the range 75 to 450 ml, and almost proportional to the input acoustic power from 60 to 195 acoustic watts. A flow system is described and a relationship linking protein release, flow rate, and the protein release constant, determined from batch experiments, is derived. Good agreement between the theoretical prediction of protein release and experimental results with the flow system was obtained.

Additional Material: 6 Ill.