منابع مشابه
Wool Grading
The American or Blood System The American system of grading wool was developed in the early 1800s when the native coarse-wooled sheep were being bred to finewooled Merino rams imported from Spain. It assumes that the offspring of the cross would have fleeces which were intermediate in fineness between the two parents. The wool grade is defined as the percentage of Merino blood carried by the sh...
متن کاملOxidation of Wool : Effect of Hydrogen Peroxide on Wool
The purpose of this investigation was to provide quantitative data showing the effect of oxidizing agents on wool as a basis for studying all processes in which wool is exposed to oxidation reactions. The work reported in this paper deals only with the effect of hydrogen peroxide. Data are presented showing the effects on wool of varying the concentration, temperature, and pH of the hydrogen pe...
متن کاملMedieval Sheep and Wool
I 'N THE PAPER I wrote twenty years ago on the origins of British breeds of sheep, I .attempted to integrate new evidence from archaeology with older documentary evidence.' Medieval archaeology was in its infancy, and the bone remains from sheep gave little information. Illustrations in illuminated manuscripts and later paintings gave better evidence than records. But the most striking new and ...
متن کاملAtypical cotton-wool spots.
Atypical cotton-wool spots in four selected cases of diabetic retinopathy are discussed. The most striking characteristic distinguishing them from typical cotton-wool spots is their size, which ranges from about 2 to 4 disc diameters. They develop after stenosis or a complete obstruction of a first order arteriole at the point at which it emerges from the parent arterial branch. The size of the...
متن کاملLipid Role in Wool Dyeing
The textile industry uses different fibers obtained from various animals, of which the wool from domesticated sheep Ovis aries is commercially the most important. Dyeing is one of the most important finishing procedures of wool processing. It almost invariably involves absorption of water-soluble colorants from aqueous solutions by the fibers. Diffusion is the process by which the colorant mole...
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ژورنال
عنوان ژورنال: Nature
سال: 1945
ISSN: 0028-0836,1476-4687
DOI: 10.1038/156176b0