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Ultrastructural characterization by ruthenium red of the surface of the fat globule membrane of human and rat milk with data on carbohydrates of fractions of rat milk (1975)

Monis, Benito ; Rovasio, Roberto A. ; Valentich, Mirta A.

Springer

Cell & tissue research 157 (1975), S. 17-24

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ISSN: 1432-0878

Keywords: Milk ; Fat globule membrane ; Carbohydrates ; Chemistry ; Ruthenium red ; Ultrastructure

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The fat globules of the cream fractions of human and rat milk were stained with ruthenium red. Under the electron microscope, discrete granules and an amorphous coat of lesser density are seen at the surface of the milk fat globules. Since ruthenium red binds anionic groups selectively, it is probable that the granules containe the greatest concentration of these groups. The cream fraction of rat milk contains hexoses, hexosamines, methylpentoses and sialic acid. Methylpentoses and hexosamines are significantly enriched in the cream fraction. It is concluded that the finding of a surface coat in milk fat globules is in keeping with the Bargmann-Knoop model and suggests a distinct mechanism for carrying certain complex carbohydrates in milk. The role of the negative charges at the outer surface of the membrane coat in maintaining fat globules in suspension and in binding certain cations such as calcium is suggested.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00223228

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Glycosaminoglycans of the plasma membranes of renal tubule and liver cells (1979)

Lis, Dora ; Monis, Benito

New York, N.Y. : Wiley-Blackwell

Journal of Supramolecular Structure 12 (1979), S. 15-22

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ISSN: 0091-7419

Keywords: glycosaminoglycans ; glycocalyx ; liver and kidney plasma membranes ; hyaluronic acid ; chondroitin sulfates ; heparin sulfates ; Life Sciences ; Molecular Cell Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: Glycosaminoglycans were isolated from plasma membranes of hepatic and renal tubule cells of guinea pig. Plasmalemma of renal tubule cells contained more total glycosaminoglycans, hyaluronic acid, chondroitin-4 sulfates and chondroitin-6 sulfates, and less dermatan sulfates and heparin sulfates than liver plasma membranes. These glycocalyx components, owing to their polyanionic properties, may have a role in the transport of water, ions, and macromolecules across the cell membrane.

Additional Material: 5 Tab.