摘要:

AbstractOn décrit un procédé de dosage de l'uranium, du thorium et du plomb dans les zircons, par fluorescence X. Sur des prises des 200 mg, des teneurs de l'ordre de 10 à 10000 ppm peuvent être déterminées avec une précision suffisante pour le calcul de l'activité α des zircons. Les résultats son

ISSN:0018-019X    

DOI:10.1002/hlca.19620450302

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractThe water vapor sorption of casein has been studied with a quartz spring balance between 0,002 and 0,050 water activity at 25°C and 45°C. The Freundlich equation describes precisely the sorption behaviour of casein under the conditions investigated. The isosteric heats of sorption have been calculate

ISSN:0018-019X    

DOI:10.1002/hlca.19620450303

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractTreatment of different 3α‐hydroxy‐5β‐steroids with lead tetraacetate leads to the formation of 3α, 9‐oxido derivatives in yields that are strongly dependent on the nature of ring C. The significance of these reactions with regard to the mechanism of the lead tetraacetate oxidation of monohydric alcohols is

ISSN:0018-019X    

DOI:10.1002/hlca.19620450304

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractDurch Behandlung von 2‐Methyl‐hepten‐(2)‐on‐(6)‐oxim (I) mit Zinkstaub in Eisessig erhält man 2‐Methyl‐5‐isopropyl‐pyrrolin‐(I) (IIA) und daraus durch katalyt. Hydrierung 2‐Methyl‐5‐isopropyl‐pyrrolidin (III); dieses lässt sich auch durch katalyt. Reduktion von 2‐Methyl‐5‐isopropyl‐pyrrolin‐(5) (Vb) oder von 2‐Methyl‐5‐isopropyl‐pyrrol (VIII) darstellen. Die beobachtete Ringschlussreaktion des offen‐kettigen Oxims I verläuft analog derjenigen cyclisch substituierter, δ‐ungesättigter Acetonderivate, d

ISSN:0018-019X    

DOI:10.1002/hlca.19620450305

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractFrom a solution containing a mercury(II)salt and thiocyanate (ratio of about 1:4), a solution of a cobalt(II) salt precipitates, in presence of benzene, a bright pink mikrocrystalline compound of the exact composition: {CoHg2(SCN)6, C6H6}, which can be also obtained in well developed cristals. Reflexion and IR. Spectra show that CoIIis octahedrally coordinated and that all six thiocyanate groups serve to bridge the two metal atoms: Hg…SCN…Co. It is suggested that the molecule of benzene formes π‐bonds simultaneously with two mercury atoms, being the fourth ligand of each Hg2+. Benzene can be replaced by toluene, the three xylenes, naphthalene, anthracene, but not by aliphatic cyclic hydrocarbons. CoIIcan be replaced by octahedral NiIIand CdII, but not by ZnIIand CuII. The compounds are thermodynamically unstable. At about 100°C the cobalt‐benzene compound loses the hydrocarbon rapidly and the colour of the solid residue turns from pink to a brilliant blue, due to the formation of a 1:1 mixture of {CoHg(SCN)4} and {Hg(SCN)2}. The compound {CoHg2(SCN)6} is non‐existent, and it is unlikely therefore that it can serve as a host‐lattice for benzene i

ISSN:0018-019X    

DOI:10.1002/hlca.19620450306

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractExamining the urine of some watch‐dial painters contaminated by strontium 90, the authors give a first approximation of the total body burden by extrapolating the values obtained during the third phase of elimination. The body burden of highly contaminated persons is found to be of the order of some microcuries, whereas that of less contaminated persons is found to be of some hundredths of microcurie

ISSN:0018-019X    

DOI:10.1002/hlca.19620450307

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractL'étude du système ternaire K+NH4+NO3H2O à 25° a conduit à un diagramme de solubilité composé de 4 courbes représentant les solutions saturées des phases solides suivantes: cristaux mixtes du type KNO3(symbole K0), contenant de 0 à 13,3 éq.‐% NH4+, cristaux mixtes d'une première phase intermédiaire (MI), contenant de 31,8 à 33,2 éq.‐% NH4+, cristaux mixtes d'une deuxième phase intermédiaire (MII), contenant de 67,6 à 96,6 éq.‐% NH4+, cristaux mixtes du type NH4NO3(symbole NH40), con

ISSN:0018-019X    

DOI:10.1002/hlca.19620450308

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractInvestigations by X‐ray and electron diffraction show that sodium chloride will be bound by casein, if the salt is added in aqueous solution to the protein and if the water is then removed under isothermal and nearly reversible conditions. This confirms earlier results obtained by water sorption measurements. The diffraction method is a simple and safe way for determining the maximum salt binding capacity of the protein. 90 to 95 models of NaCl are bound by 105g of casein, which is more than 80% of the amount calculated from the amino‐acid composition of the prot

ISSN:0018-019X    

DOI:10.1002/hlca.19620450309

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

AbstractN‐(2‐Carboxyphenyl)‐C‐(2‐hydroxy‐1‐naphthyl)‐methylenimine, which is an analogue of (2‐carboxyphenyl)‐azo‐(2‐hydroxy‐1‐naphthalene), is shown to form several isomeric 1:2‐chromium compl

ISSN:0018-019X    

DOI:10.1002/hlca.19620450310

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY

摘要:

Abstract(−)‐Dehydrogriseofulvin (I) is converted to the diphenylether derivatives IV or VIII, respectively, by action of a base or an acid. The mechanism of the basic ring opening reaction has been established by use of14C labelled methanol. In the case of the epimerisation of griseofulvin (II) under the influence of methylate, however, it is shown that a more complicated mechanism is invol

ISSN:0018-019X    

DOI:10.1002/hlca.19620450311

出版商:WILEY‐VCH Verlag GmbH    

年代:1962

数据来源: WILEY