Zobrazeno 1 - 10
of 186
pro vyhledávání: '"H. Veldstra"'
Autor:
E. Havinga, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 66:285-299
Autor:
H. Veldstra, P. W. Wiardi
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 62:75-84
The synthesis is described of 2-methyl-4-aminonaphthol-1 hydrochloride and of 2-methyl-1,4-diaminonaphthalene dihydrochloride, both water soluble compounds possessing a high vitamin K activity. For the first mentioned substance this has already been
Autor:
E. Havinga, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 66:257-272
With the aim of providing more facts for the discussion of the mode of action of the sulphonamides and of p-aminobenzoic acid, the ultraviolet absorption spectra are recorded for a number of sulphanilamide derivatives, p-aminobenzoic acid and related
Autor:
E. Havinga, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 66:273-284
Sulphanilamide, p-aminobenzoic acid and a number of their derivatives are studied polarographically in order to ascertain whether or not it is probable that p-aminobenzoic acid functions in a redox system, and to compare their affinities for the rath
Autor:
H. Pouwels, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 74:795-804
Contrary to expectations, based upon a certain structural resemblance between 3-(piperidyl-(2)-methyl-)indoles (II) and quinine (III), the change from quinine and related alkaloids to their 9-deoxy bases (via the 9-chloro-9-deoxy derivatives) does no
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 73:23-34
At 10−4 - 10−2 mol/l a number of sulphonic acids and related compounds, especially indole (3) methane-sulphonic acid and 2,3,6-trichlorophenylmethanesulphonic acid were found to be active as growth substances in the pea test, Avena straight growt
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 72:236-246
The synthesis of one of the stereoisomeric forms (probably the threo-form) of DL-2-dichloroacetamido-1-(4-pyridyl)-1,3-propanediol, the pyridine analogue of chloramphenicol, is described. Its activity against Salm. typhimurium and Ebert. typhi is 1-3
Autor:
C. van de Westeringh, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 70:1113-1126
(dl) 1,2,3,4-Tetrahydro-α-naphthoic acid, selected for investigation on account of the fact that we deemed it to meet especially well the spatial requirements for active compounds, proved to be very active in the pea-test, After resolution of the ra
Autor:
C. van de Westeringh, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 77:1114-1128
By comparative investigations with 3-indolylacetic acid and its sulphonic acid analogue, both labeled with 14C in the CH2-group of the side chain, it was shown that the uptake of the partly dissociated carboxylic acid is much higher than that of the
Autor:
C. van de Westeringh, H. Veldstra
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 77:1096-1106
Phosphonic and phosphonous acids of the indole and the naphthalene series were synthesized and assayed in the pea test and the avena straight growth test. 3-Indolylmethylphosphonic acid proved to be the most active compound among the phosphonic acids