摘要:

AbstractIf two variable liquids, which are in osmotic contact with an invariant liquid, have the same composition at the beginning of the osmosis and, of course, also the same composition at the end of the osmosis (viz. that of the inv. liq.), they will get, however, a different composition at every moment of the osmosis.

ISSN:0165-0513    

DOI:10.1002/recl.19400590702

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractEs wurde eine Jenaer Glaselektrode auf ihre Brauchbarkeit für elektrometrische Titrationen geprüft. Es zeigte sich, dass dieselbe sowohl für Titrationen in schwach alkalischen, als auch in schwach sauren Gebiete und auch für oxydierende Säuren sehr gute Resultate liefert. Die Handhabung der Elektrode und die Messmethode sind äusserst ei

ISSN:0165-0513    

DOI:10.1002/recl.19400590703

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractIt is emphasized, that many constituents of the soil which are essential for the nutrition of plants, may be better estimated by biological than by chemical methods. Some such methods are described, especially those for the estimation of plant‐available copper and magnesium, using the moldAspergillus nige

ISSN:0165-0513    

DOI:10.1002/recl.19400590704

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractSome very sweet derivatives of metanitraniline have been prepared.

ISSN:0165-0513    

DOI:10.1002/recl.19400590705

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractThe validity of the ionic picture of the bond in the vapour molecules of the alkali halides in the neighbourhood of the minimum of the potential curve is tested in this paper with the aid of experimental data from three different sources: (1) the distances between the nuclei at absolute zero temperature are calculated from those determined at 1200°C by electronic diffraction and from the atomic distances in the corresponding crystal lattices; (2) the first vibrational frequencies are calculated from the potential curve and compared with the values derived from the spectra; (3) the binding energies or molecular energies at absolute zero are calculated and compared with values derived from thermal data.A very good agreement is already obtained by the simple equation (Fig. 1), especially with reference to (1) (Fig. 3; Table II) and (2) (Table IV), withn= 11. The Born‐Mayer exponential repulsion equation is not applicable in this case. A still better approximation can be obtained by allowance for the mutual polarization; in that case also the calculated molecular energies are exactly of the right magnitude within the experimental errors (Table III). The best value of n for all alkali halides is apparently n =

ISSN:0165-0513    

DOI:10.1002/recl.19400590706

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractA new hypothesis explaining the mechanism of elaidinization is given. Elaidinization is caused by addition followed by elimination of unstable hydrogen compounds. The hypothesis is in accordance with the known facts and it explains the fact that it must be an equilibrium reaction. Confirmation is found that elaidic acid will be thecisform.

ISSN:0165-0513    

DOI:10.1002/recl.19400590707

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

Abstractβ‐(2‐Pyridyl)‐propionaldehyde‐acetal has been prepared from bromoacetal and α‐picolyl lithium.The preparation of this compound forms the first step in a synthesis ofdl

ISSN:0165-0513    

DOI:10.1002/recl.19400590708

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractDas Gesamtbasenbindungsvermögen (T‐Wert) des mineralischen Bodenkomplexes und seiner Fraktionen wurde für verschiedene Bodentypen bestimmt. DieT‐Werte für 100 g von Fraktion I (mineralische Teichen kleiner als 0.002 mm) wiesen dabei grosse Unterschiede auf (c‐Zahlen). Drei Hauptgruppen wurden unterschieden mit Durchschnittszahlenc= 164, 101 und 72. Die untersuchten Niederländischen Böden haben ziemlich gleichec‐Zahlen zwischen 116 und 90; sie gehören alle zu der zweiten Gruppe (c im Mittel = 105). Betreffs der Ursache dieser Unterschiede werden einige Bemerk

ISSN:0165-0513    

DOI:10.1002/recl.19400590709

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractA spectroscopic method has been used for studying the effect of substitution in the benzene nucleus ofo‐hydroxy‐azo‐dyestuffs of the type: benzene azo‐2‐hydroxynaphthalene 3: 6‐disulphonic acid, on the tendency of the hydroxyl group in these dyestuffs to dissociate in aqueous solution.There appears to be a connection between the optical and the chemical consequences of a particular substitution, in the sense, that a bathochromic effect goes parallel with an increased fastness to alkali, i.e. a decreased tendency to dissociation of the hydroxyl group, in agreement with what has already been postulatedIdem, Ibid.30, 544 (1933)..Ortho‐substitution (with regard to the azo group) leads to a considerably increased fastness to alkali. Since this is unaccompanied by any parallel optical effect, it would appear to originate away from the azo group. The effect of a secondortho‐substituent is completely different; the effect on the fastness to alkali is small and changeable, and the absorption band of the dyestuff is displaced towards a h

ISSN:0165-0513    

DOI:10.1002/recl.19400590710

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractInvestigations have been made to prepare a pure and stable ceric oxide sol by hydrolysis of ceric ammonium nitrate in an electro‐dialyser. The problem cannot be solved completely in consequence of the conflicting requirements with regard to pHand the removal of the cerous nitrat

ISSN:0165-0513    

DOI:10.1002/recl.19400590711

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY