Protoplasm : its definition, chemistry and stucture / by Gustav Mann.
- Gustav Mann
- Date:
- 1906
Licence: In copyright
Credit: Protoplasm : its definition, chemistry and stucture / by Gustav Mann. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![to a certain extent, has also arrived at this conception, for he pointed out in 1905' that the alloxur- or purin-bases, and further also a pyrimidin-derivative, which on hydrolysis gives rise to cytosin (or uracil) and th5'min (see above) are not only rich in nitrogen, but also possess the C and N arranged alternately: Imido-azol ring. N—C [In the alloxur bases ; probably also in histidiu.] Pyrimidin ring. Arginin. N ,N—C [In the alloxur bases, in uracil, thymin, cytosin.] and that this chemical peculiarity was characteristic of that part of protoplasm which is concerned with the processes of propagation and the formation of new substances. The Protamins above referred to, as shown by the following table, are characterized by the presence of a high percentage of di-amino-acids, which renders them strongly basic : Table Showing the Composition of the Protamins. - .E 'C E s Salmin. Clupein. Sturin. Cyclopterin. 1 1 a-Cyprinin. \ Alanin (o-amino-propionic acid) + 0 -1- + ? ? Serin (oxy-alanin) ... 0 -I- ■F 0 ? ? Amino-valerianic acid ... ... 0 -t- + 0 ? + Leucin (iso-butyl-a-amino-acetic acid) 0 0 0 ' +• ? Diaraino-valerianic acid (ornithin) ■f -»• + + ■f + DiaminO-caproic acid (lysint ... 0 0 0 + 0 •f Histidin (imido-azol-alanin) ... 0 0 0 i -t- 0 0 o-Pyrrolidin-carboxvlic acid ... + ■ -I- -F 0 ? ? Tyrosin (oxy-phenyl-alanin) ... 0 0 0 ; 0 •E 0 Urea + ■h + i + + + Tryptophane (indol-amino-propionic acid) ... 0 0 0 ; 0 + 0 Ammonia 0 0 0 0 ? ? ‘ A. Kossel, Zeitsch.f. physiol. Chem. 44. 347 (1905). C 2 /3-Cyprinin.](https://iiif.wellcomecollection.org/image/b22471303_0023.jp2/full/800%2C/0/default.jpg)
