منابع مشابه
Precursors of impregnation
– The progression of a liquid inside a porous medium often involves two macroscopic fronts: a main one, at the bottom, which saturates the medium; and a much thinner one, ahead, which propagates using the fine structures of the porous material. We discuss here different characteristics of this precursor. We show in particular how it can move faster than the main front, although it follows confi...
متن کاملThe Impregnation of Neurofibrils *
The importance of neurofibrillar impregnations in the study of the nervous system needs no emphasis. However, the silver methods currently used involve such a complex of variables that the results are by no means constant. The present communication is devoted to the problem of interpretation of results, together with certain fundamental relations between brain tissue and silver solution. The mo...
متن کاملImpregnation without Rupture of Hymen
A few years ago, when officiating as civil surgeon in ODe of the stations of the North-West-Provinces, I was asked to prescribe for a lady whose prevailing and prominent symptom was sickness. It was unceasing. Exaggerated in the morning it continued throughout the day. At night only, when my patient slept, was relief experienced. She had been married a few months. I pronounced her to be pregnan...
متن کاملImpregnation of Preservative and Fire Retardants into Japanese Cedar Lumber by Passive Impregnation
Copper azole type B (CAz-B) preservative and polyphosphatic carbamate (PPC) fire retardants were impregnated in succession into green (97% MC) and kiln-dried (18% MC) Japanese cedar (Cryptomeria japonica (L.f.) D.Don) lumber by the passive impregnation method to prolong the period of lumber use by increasing its resistance to fire and biological degradation. Lumber was dried with a kiln or by a...
متن کاملSilver Impregnation for Electron Microscopy
Heavy metal impregnation of specimens for electron microscopy offers a means for differential "staining" of various tissue components and cellular constituents. Of many silver impregnation methods, one of the most useful is Gomori's silver methenamine (1) after periodic acid oxidation (PA-SM) (2, 3). Several authors have applied silver impregnation to electron microscopy (4-7), mainly for the d...
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ژورنال
عنوان ژورنال: Microscopy Today
سال: 2000
ISSN: 1551-9295,2150-3583
DOI: 10.1017/s1551929500057114