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Digitale Medien

Skinned polymeric membranes. Approach to the mechanism of formation of surface holes (1995)

Addad, J. P. Cohen ; Icard, B. ; Pellicioli, L.

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

Polymer International 38 (1995), S. 299-303

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ISSN: 0959-8103

Schlagwort(e): skin membranes ; hole formation ; diffusion ; polyetherimides ; videomicroscopy ; solvent diffusion coefficient ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: It is shown quantitatively that the formation of holes through the skin of membranes, prepared by the quick immersion in water of polyetherimides in solution in N-methylpyrrolidone, is governed by the solvent mobility. The surface pattern observed by videomicroscopy exhibits a characteristic distance between neighbouring holes (≃5 μm) which is a linear function of D-1s; Ds is the solvent diffusion coefficient in the polymeric solution, measured using a pulsedfield gradient NMR technique. The dependence of this distance on the solvent concentration in water is also characterized.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pi.1995.210380312

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Digitale Medien

Antiviral activities of anthraquinones, bianthrones and hypericin derivatives from lichens (1996)

Cohen, P. A. ; Hudson, J. B. ; Towers, G. H. N.

Springer

Cellular and molecular life sciences 52 (1996), S. 180-183

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ISSN: 1420-9071

Schlagwort(e): Antiviral activity ; 7,7′-dichlorohypericin ; 5,7-dichloroemodin ; hypericin ; anthraquinones ; bianthrones ; lichen ; Nephroma laevigatum ; Heterodermia obscurata

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Abstract The antiviral activities of some naturally occurring anthraquinones bianthrones, and hypericin derivatives were compared by the end-point CPE (viral cytopathic effects) method and plaque assays. Under optimal conditions of exposure to light, hypericin, 7,7′-dichlorohypericin and 5,7-dichloroemodin exhibited strong inhibitory activity against HSV-1 (herpes simplex virus type 1) in both assays. Partial inactivation of the virus was shown by emodin, 7-chloroemodin and 7-chloro-1-O-methylemodin; the bianthrones and other anthraquinones were found to be inactive. Antiviral activity appeared to be, positively correlated with increasing substitution of chlorine in the anthraquinone structure. In the absence of light, only hypericin and 7,7′-dichlorohypericin displayed detectable activity.