own experiments. Before

2010-12-4 14:16:57 2677

0 本帖最后由 eehome 于 2013-1-5 10:05 编辑 times New="New" Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">indigoproducing body of urine, if it be not identical with indic Moncler , Moncler jacket, Moncler K2 vest black, Moncler K2 vest Pink an, is certainly quite as susceptible of change as the latter; and the small quantity existing in the secretion may easily disappear under the influence of heat, alkalies, or ermentation, and become so changed as no longer to yield indigo-blue or indigo-red with acids. The nature of this change I have explained in my papers on the formation of indigo-blue. Now, Dr. Thudichnm's process commences b Moncler jackets, Moncler Multiple K2 Vest Beige y adding to urine an excess of caustic baryta or lime. At subsequent stages he boils and evaporates his liquids with the assistance of heat. After operations such as he describes it is impossible that any trace of indican, or any body resembling it, can remain undecomposed. Unless certain precautions are adopted in conducting delicate experiments, only negative results can be expected. Moncler jackets for men, Moncler Alpin, Moncler Angers, Moncler Bady alkaptone of Baedeker, and the colloid acid from urine lately described by Marcet t, probably stand in some relation to the ordinary extractive matters of urine, which they strongly resemble in most of their chemical and physical properties. The nature of the methods employed for the preparation of these bodies renders it, however, extremely doubtful whether they preexisted in the secretion, since in both cases solutions containing, together with the organic substances, strong mineral acids, were Moncler Branson Jacket ，Moncler Branson Navy , Moncler Bea heated and even evaporated—a proceeding which must have led to the decomposition of the extractive matters, and the formation of bodies not previously existing. The preceding account, in which I have endeavoured to present a summary of the results obtained in previous researches, will serve to give an idea of the present state of our knowledge on this subject; and I will now proceed to give an account of my own experiments. Before doing so, I may state that I shall apply the term "colouring-matter" to those bodies only which occur naturally in urine, or are formed by processes of decomposition, a Moncler down jackets, Moncler Multiple K2 Vest Black nd which are insoluble, or not easily soluble, in water. The substances easily soluble in water, to which the colour of normal urine is due, I shall continue to call " extractive matters," until I shall have shown that they are bodies the properties and composition of which are sufficiently definite and unvarying to justify me in bestowing on them peculiar names. The extractive matters being, as I believe, the source from which most of the colouring-matters of urine are derived, I resolved to commence t Moncler jackets women, Moncler Boutique he investigation by a careful examination of their properties and composition. The first step, indeed, which I thought it necessary to take before proceeding further at all was to ascertain whether these extractive matters are Annalen der Chemie und Phnrmncie, 0
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