bluuebunny/crossref_metadata_2025_split huggingface dataset:
Untersuchungen über die Hydroxysäure(n) des Isanoöls, I
Authors: Steger Alph. , van Loon J. 
Published: September 2010

AbstractDas Isanoöl enthält eine (oder mehrere) ungesättigte Hydroxysäure(n), welche zu der 9‐Hydroxystearinsäure hydrogeniert wurde(n), wie durch Wasserabspaltung und durch Ozonisierung der dabei gebildeten Octadecensäuren bewiesen wurde.
Über die Löslichkeit des Roten Mercurijodids in Wasser
Authors: de Bruijn J. A. 
Published: September 2010

AbstractIm Folgenden wird auf die einander widersprechenden Literaturangaben für die Löslichkeit des roten Mercurijodids und des schwarzen Mercurisulfids in Wasser hingewiesen. Die (geringe) Löslichkeit des Jodids ist nun von neuem, auf colorimetrischem Wege, bestimmt worden; dabei hat sich ergeben, dass ein Teil der hierauf bezüglichen Literaturangaben als ganz unzuverlässig bezeichnet werden muss.
The density and sorptive capacity of some samples of cotton, silk and wool: Part III. Determinations on egyptian cotton
Authors: Heertjes P. M. 
Published: September 2010

AbstractFor mercerised cotton, undyed and dyed with a substantive dye, the true densities in helium and the apparent densities in benzene, water, air and hydrogen are given in this paper. The conclusion is reached that in cotton dyed with a substantive dye, the dye is bound intermicellarly, without changing the cotton substance.Hydrogen as well as air are adsorbed by cotton; the quantities adsorbed are not altered by the dyeing process.The opinion of Campbell and Russell that the true density of cotton will be found in water and not in helium, is disputed.Some remarks are made on the dyeing processes of cotton, silk and wool with direct dyes.
Cohesion forces and phase theory of binary liquid systems
Authors: Staverman A. J. 
Published: September 2010

AbstractAn attempt is made to understand the phenomenon of mixing and unmixing of liquids from a simple model of cohesion forces. Since in the heat of mixing it is only the differences of cohesion forces which are important, induction and dispersion forces are neglected in a first approximation, whereas orientation forces are described by assigning to the molecular surfaces positive or negative spots, which eventually tend toward association. The energy of association and solvation depends on the activity of those spots, the entropy on their area. Starting from simple molecular models, the shape of the mixing curve is derived theoretically and in all cases experimentally found examples are quoted. There appears to exist no fundamental miscibility curve, from which all experimentally realised curves could be derived. On the contrary, the theoretical curves differ considerably for different mixtures, even when we assume the liquid state stable to arbitrary high and low temperatures.
A synthesis of the acetal of dl‐pelletierine or β‐(2‐piperidyl)‐propionaldehyde acetal.
Authors: Beets M. G. J. , Wibaut J. P. 
Published: September 2010

AbstractIn the catalytic hydrogenation of β‐(2‐pyridyl)‐propionaldehyde acetal (I) in a solution of pure acetic acid with a platinum catalyst according to Adams the following substances may be formed as addition compounds with acetic acid: the δ‐coniceine of Löffler (III) and the β‐(2‐piperidyl)‐propionaldehyde acetal or the acetal of dl‐pelletierine (II).The latter compound is obtained almost exclusively when a very concentrated solution of I in acetic acid is subjected to catalytic reduction. The acetal of dl‐pelletierine is a stable colourless liquid. Upon hydrolysis of this acetal a liquid with a strong reducing action is obtained which is rapidly converted into a reddish resin, corresponding to the behaviour of dl‐pelletierine as described in the literature.
Das Fette Oel der Samen von Isatis Tinctoria, L.
Authors: Steger Alp H. , van Loon J. 
Published: September 2010

AbstractDas fette Öl der Samen von Isatis tinctoria L. enthält neben den gesättigten Säuren als ungesättigte: Eruca‐, Linol‐, Linolen‐ und Ölsäure in ungefähr gleichen Mengen.
Die Struktur der Phasengrenze bei Hydrophoben Kolloiden: V. Die Struktur der Phasengrenze beim System AgJ‐Elektrolyt
Authors: de Bruyn H. 
Published: September 2010

AbstractEs wurde für Systeme der Type AgJ‐Elektrolyt ein Bild der Phasengrenzstruktur entwickelt, wobei die speziellen Eigenschaften der beiden in Kontakt stehenden Phasen in Rechnung gestellt wurden.Die in früheren Abhandlungen beschriebenen charakteristischen Eigenschaften dieser Type von Systemen passen ganz zu dem hier ausgearbeiteten Bilde.
On the oxidation of methyl and ethyl alcohol. The mechanism of reaction in the gas phase
Authors: Jorissen W. P. , van Selms F. G. , Kreulen D. J. W. 
Published: September 2010

AbstractThe oxidation of methyl alcohol has been investigated in the liquid phase and the gas phase. In the latter case copper and aluminium were used as catalysts. Also the decomposition of methyl alcohol was investigated, oxygen being absent. These experiments were repeated using no catalyst.Some experiments were made on the oxidation of ethyl alcohol in the gas phase and on the reduction of carbon monoxide with hydrogen.
Das Trocknen von Gasen
Authors: van Liempt J. A. M. 
Published: September 2010

AbstractAbleitung einer Näherungsformel, welche den Wasserdampfgehalt eines Gases nach Durchführung durch eine Trockenanlage als Funktion von Rohrlänge, Gasgeschwindigkeit, Druck und Temperatur angibt.Die Formel steht in befriedigender Übereinstimmung mit vorliegenden Daten.Praktische Angaben für technische Berechnungen.
A new method for the determination of lactoflavin
Authors: Schuringa J. H. 
Published: September 2010

AbstractA new method for the determination of lactoflavin in cereals and urine has been developed. Cereal products are extracted with 2 n alcoholic hydrochloric acid, the extract purified by extraction with phenol, adsorption with PbS and elution with a saturated NaCl solution, the extinction of a phenolic extract in which lactoflavin does not fluoresce then being determined in the step‐photometer.
Synthesis and activity of some heterocyclic sulphanilamide derivatives. I
Authors: Veldstra H. , Wiardi P. W. 
Published: September 2010

AbstractThe synthesis of a number of heterocyclic derivatives of sulphanilamide is described and information is given about the activity of these compounds against pneumococci and streptococci (in mice). Sulphanilamide (or derivatives) are substituted in N1 by 5‐(3′‐pyridyl)‐pyrazole, 2‐methylpyridine, 4‐methyl‐ and 4‐n‐propylpyrimidine or tetrazole, and in N4 by a nicotinyl group.
La Méthode à L'Acide Borique et la Configuration des d‐Mannoses
Authors: Böeseken J. 
Published: September 2010

AbstractDans une communication sur ce même sujetJ. Böeseken, Rec. trav. chim. 61, 77 (1942).
, j'avais conclu que le β‐d‐mannose serait le trans‐mannopyranose, parce que l'augmentation du pouvoir conducteur de l'acide borique causée par ce sucre s'accroit pendant la mutarotation. Cette conclusion doit être revisée.Jackson et HudsonErnest L. Jackson and C. S. Hudson, J. Am. Chem. Soc. 59, 994 (1937).
ont trouvé, en oxydant l'éther méthylique de l'α‐d‐mannopyranose par de l'acide periodique, que cet éther et, conséquemment, l'α‐mannopyranose lui‐même doivent avoir la configuration trans. Il en résulte que dans le β‐mannose, l'hydroxyle lié au carbone‐1 occupe la position cis par rapport à l'hydroxyle du carbone‐2. Dans ce qui suit, je veux exposer comment ce résultat, qui parait étre en contradiction avec les résultats des mesures de la conductibilité électrique, peut être expliqué par la formation passagère des d‐mannofuranoses.
The density and sorptive capacity of some samples of cotton, silk and wool. Part IV. Some remarks on the sorption of water by cotton, silk and wool
Authors: Heertjes P. M. 
Published: September 2010

AbstractIn this paper the relations between the volumes of dry fibres and fibres with different percentages of regain are discussed. With the aid of these relations and based on the opinion, that a solid substance will not sorb a liquid with appreciable contraction, the conclusion is reached that water will be sorbed by hydrophylic fibres in three ways, viz.:
by absorption in the outer layer of the micelles,
by adsorption at the micelle surface without contraction, and
by capillary condensation also without contraction.
The effect of the felting process and dyeing processes on the quantity of water sorbed, and more generally on the sorptive capacities of the fibres cotton, silk and wool is discussed.
The crystal structure of potassium thioferrite KFeS2 and sodium thiochromite NaCrS2
Authors: Boon J. W. , Mac Gillavry C. H. 
Published: September 2010

AbstractKFeS2 is monoclinic, pseudohexagonal; it consists of chains (FeS2)n with K in the interstices. NaCrS2 has a rhombohedral layer lattice. The relation of these compounds to the mineral “sulpho‐salts” is discussed.
Untersuchungen über Pyrrolderivate: 8. Mitteilung
Authors: Rinkes I. J. 
Published: September 2010

AbstractIn der vorliegenden Abhandlung ist die Einwirkung von Nitrosoacetanilid auf Pyrrol‐N‐carbonsäure‐äthylester und 2‐Pyrrol‐carbonsäure‐methylester beschrieben.
Determination of nicotinic acid etc. In human urine and stool (II)
Authors: Roggen J. C. 
Published: September 2010

AbstractA routine method is given for the determination of nicotinic acid and trigonelline in normal as well as in highly coloured urine.Both compounds are excreted quite constantly; orally administered nicotinic acid and nicotinamide affect the quantities excreted to different degrees.In faeces it is chiefly nicotinic acid which is encountered; the amounts are not increased by a large dose of nicotinic acid (nicotinamide) taken through the mouth. In order to avoid disturbing secondary colour reactions the nicotinic acid is purified by oxidation and adsorption on franconite; the trigonelline is determined by colorimetry of the dialdehyde which is formed from it by hydrolysis with alkali. A large part of orally taken nicotinic acid (amide) could not be recovered from the excreta. A remarkable reaction of the trigonelline is described. It is found that the colour reaction in the form given until now is not sufficiently specific.A large part of orally taken nicotinic acid (amide) could not be recovered from the excreta.A remarkable reaction of the trigonelline is described. It is found that the colour reaction in the form given is not sufficiently specific.
Dérivés de la sulfanilamide renfermant l'anneau 1,2,4‐triazol
Authors: Backer H. J. , de Jonge J. 
Published: September 2010

AbstractLes auteurs ont préparé plusieurs sulfonamides renfermant l'anneau triazol, en faisant agir le p‐acétylaminobenzènesulfochlorure ou le p‐nitrobenzènesulfochlorure sur le 5‐amino‐3‐méthyl‐1,2,4‐triazol et sur le 5‐amino‐1,2,4‐triazol. Chaque réaction donne naissance à deux isomères, dont l'un se dissout dans les alcalis.
The crystal structure of phosphorus pentabromide
Authors: van Driel M. , Gillavry C. H. Mac 
Published: September 2010

AbstractThe crystal structure of PBr5 has been investigated by X‐ray analysis, a = 5.62, b = 16.91, c = 8.29 Å. The space group is D 11/2h–Pbcm. This is in complete agreement with the results of Powell and Clark1). Their statement that the structure consists of ions PBr4+ and Br– is confirmed. The PBr4+ group is found to be a nearly regular tetrahedron with bond length P‐Br = 2.2 Å. The shortest distance between Br‐ and P is 4.3 Å. Interionic as well as intraionic distances Br‐Br are abnormally short.
The influence of a third phase on the rheology of suspensions
Authors: Kruyt H. R. , van Selms F. G. 
Published: September 2010

AbstractThe plasticity (thixotropy) of suspensions of small glass beads in CCl4 and similar media was studied in connection with the dependence of the yield value on the water content. In the case of suspensions of glass the magnitude of the surface of the disperse phase is known; quantitative results can therefore be obtained.Our investigations lead to the conclusion that the plasticity of the suspensions studied is to be ascribed to the work necessary to break the water linkages which join the particles as a third phase. It is not the non‐polarity of the medium, but the insolubility of water in the medium; this causes the formation of a third phase, which leads to the occurrence of plasticity in cases when water shows a preference to adhere to the particles. As a converse to the suspensions of starch, quartz and glass in CCl4 with addition of water, the system coal in water with addition of xylene is described.
The rate of shear‐shearing stress diagram (D‐τ diagram) of plastic suspensions
Authors: de Bruyn H. 
Published: September 2010

Abstract
The plastic behaviour of suspensions is considered from the point of view of energy, of structure and of mechanics. According to this method of consideration the systems which exhibit so‐called Ostwald structural viscosity (Ostwald systems) are to be conceived of as suspensions with elastically deformable micelles, while the so‐called Bingham systems are to be conceived of as suspensions of complexes which exhibit distintegration during stationary flow.
The similarity and the difference is pointed out between our method of analysis of the D‐τ data of suspensions of the Bingham type and the method of analysis proposed by Williamson.
The fluidity (reciprocal of the viscosity) is determined for Ostwald systems by \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{\dot D}}{\tau } $\end{document}, for Bingham systems by \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{d\dot D}}{{d\tau }} $\end{document}.
The fluidity‐shearing stress (φ‐τ) diagram, related in a simple way to the D‐τ data, enables us to establish the plastic behaviour of suspensions in general with the help of the same constants (liquidation tendency L and plasticity limits τ1 and τ2).
The preparation of 4‐amino‐1,2‐ethylenedioxybenzene and some azo dyes derived therefrom
Authors: Heertjes P. M. , Dahmen E. A. M. F. 
Published: September 2010

AbstractThe preparation of 4‐amino‐1,2‐ethylenedioxybenzene by cathodic reduction of the corresponding 4‐mononitro compound is described. The amino compound obtained is easily diazotized and, on coupling with different azo components, new azo dyes of, in general, good quality and brilliant colour are derived.
On the three‐phase pressures for solid salt‐solution‐vapour III
Authors: Korvezee A. E. , Dingemans P. 
Published: September 2010

AbstractA very simple approximate expression (equation 5) is derived for the relation between the melting point of a solid substance and the temperature at which a maximum occurs in the three‐phase pressure curve solid substance‐saturated solution‐vapour.An expression is also given (equation 7) for the distance between the temperatures of the two maxima in the three‐phase pressure curves, when the solid substance occurs in two modifications. Both equations are found to agree well with the observations for all the now known systems water‐salt.
Über 5‐Sulfanilamidotetrazol
Authors: Jensen K. A. , Hansen O. Rosenlund 
Published: September 2010

AbstractDas von Veldstra und Wiardi beschriebene Acetylsulfanilylderivat des 5‐Aminotetrazols is nicht 5‐Acetylsulfanilamidotetrazol, und kann deshalb nicht bei der Hydrolyse 5‐Sulfanilamidotetrazol bilden. Das wahre 5‐Acetylsulfanilamidotetrazol gibt aber auch nicht bei der Hydrolyse 5‐Sulfanilamidotetrazol, sondern unterliegt einer Ringsprengung. Auch bei Einwirkung von Sulfanilsäurefluorid auf 5‐Aminotetrazol gelang es nicht, das 5‐Sulfanilamidotetrazol darzustellen.
The consistency of plastic suspensions of the Bingham type
Authors: de Bruijn H. , Dols H. , Kuyper C. 
Published: September 2010

Abstract
)The consistency of a plastic suspension of the Bingham type was characterized by deriving φ‐τ diagrams from the D‐τ diagrams.
) In the case of the plastic suspensions of carbon in mineral oil it is deduced from the φ‐τ relation that the temperature coefficient of the consistency is determined almost entirely by the medium of suspension.
) Attention is called to the large errors caused by the turbulence occurring during measurements at high shearing stresses.
) In order to describe the curved part of a D‐τ diagram more exactly by means of constants, the concept of liquidation tendency is introduced. This liquidation tendency can be read off directly from a φ‐τ diagram.
Über einige Aminosäuren in Lolium perenne
Authors: de Man. Th. J. 
Published: September 2010

AbstractIn Lolium perenne wurden das freie Arginin, Tyrosin und Tryptophan bestimmt; es wurde gefunden, dass ein konstantes, vom Alter des Grases unabhängiges, Verhältnis zwischen diesen drei freien Aminosäuren besteht; durchschnittlich:

Auch zwischen dem im Eiweiss gebundenen Arginin, Tyrosin und Tryptophan besteht ein konstantes und gleiches Verhältnis.Während der Nachprüfung einer von Roth für Pflanzen ausgearbeiteten Tryptophanbestimmung wurde gefunden, dass diese Methode für ligninhaltiges Material ungeeignet ist: im Material mit bekanntem Tryptophangehalt würde sogar eine einfache Ligninbestimmung, welche auf der nach Roth abgeänderten “Xanthoproteinreaktion” beruht, möglich sein.
Teneur en hydrates de carbone et „facteur d'albumine”︁ de la chair de moule
Authors: Gerritsen D. J. , van Pelt. J. G. 
Published: September 2010

AbstractLes deux méthodes appliquées par Van de Velde pour la détermination des hydrates de carbone dans la chair de moule c. à d. 1) le chauffage à120°C avec de l'acide citrique à 5% et 2) la précipitation des hydrates de carbone d'une solution dans KOH conc. au moyen d'alcool éthylique, donnent, l'une et l'autre, des résultats beaucoup trop faibles.Les valeurs que donne la méthode bien connue de Sachsse sont notablement plus élevées.Par conséquent, la conclusion tirée par Van de Velde de ses analyses, que le “facteur d'albumine” est, pour la chair de moule, notablement plus élevé qu'on le pensait et s'élève à 8.0 environ, est erronée.
On the reaction of lithium picolyl with ethyl acetate
Authors: Beets M. G. J. 
Published: September 2010

AbstractIn connection with the article by Wibaut, Kloppenburg and Beets 1)1)J. P. Wibaut, C. C. Kloppenburg and M. G. J. Beets, Rec. trav. chim. 63, 134 (1944).
, the reaction between lithium picolyl and ethyl acetate is described.
Some sulphanilamido‐nitro‐n‐propoxybenzenes
Authors: Verkade P. E. , Wepster B. M. 
Published: September 2010

AbstractThe preparation of some sulphanilamido‐nitro‐n‐propoxybenzenes is described. The stability of these substances toward aqueous alkalies and their resistance as well as that of their N4‐acetyl compounds toward deacylation by the method of Verkade and Witjens is discussed. The substances proved to be inactive against pneumococcal infections in mice.
Untersuchungen über Indolderivate. IV. Theoretische Betrachtungen über die drei Arten der Indolbildung aus α‐Arylaminoketonen
Authors: Verkade P. E. , Janetzky E. F. 
Published: September 2010

AbstractDie vorliegende Abhandlung enthält einige theoretische Betrachtungen über die drei Arten der Indolbildung aus α‐Arylaminoketonen.
Hydrogenation of the fatty acids in butter with raney nickel
Authors: Kentie A. , Nauta W. Th. 
Published: September 2010

AbstractA description is given of the complete hydrogenation of the fatty acids of butter to an iodine number of one in a very gentle way, namely with the help of a Raney‐nickel catalyst, at a low temperature and a pressure of one atmosphere. It proved to be possible to carry out the hydrogenation in aqueous solution. The best results were however obtained in alcoholic solution. The influence of temperature and a promotor (ammonium chloroplatinate) were studied.
Des Acridines Substituées. I. Sur quelques 9‐alcoyl‐ et 9‐aryl‐alcoyl‐acridines
Authors: Buu‐Hoï N. G. Ph. , Lecocq Jean 
Published: September 2010

AbstractDans le présent travail, les auteurs complètent les connaissances qu'on possède sur le groupe des méso‐alcoyl‐ et des méso‐arylalcoyl‐acridines, par la synthèse d'une série de ces composés et la description de leurs propriétés; le travail est complété par l'indication d'une méthode de préparation nouvelle de la 9‐benzoyl‐acridine, susceptible d'étre généralisée à la synthèse d'autres aryl‐9‐acridyl‐cétones.
A new synthesis of methyl‐isopelletierine: Experiments on the synthesis of alkaloids of punica granatum 4th communication
Authors: Wibaut J. P. , Kloppenburg C. C. 
Published: September 2010

AbstractBy the action of dimethyl sulphate on 1‐(2‐pyridyl)‐propanone‐2 the corresponding quaternary N‐methylpyridinium salt is prepared; by partial hydrogenation of this compound we obtained 1‐(α‐N‐methylpiperidyl)‐propanone‐2 or methylisopelletierine in a yield of 47% of the theoretical calculated on α‐picolylmethylketone.
The Raman spectra of a number of polychloro compounds
Authors: Gerding H. , Rijnders G. W. A. 
Published: September 2010

AbstractThe Raman spectra are given of the following compounds, for the greater part prepared by Prins and put by him at our disposal: CCl3. CHCl2 (P), C3Cl8, CCl3.CHCl.CCl3 (P), CCl3.CCl2. CHCl2, CCl3. CHCl. CHCl2. CHCl2. CCl2. CHCl2. CHCl2. CHCl. CHCl2, CHCl2. CCl2. CHCl. CHCl2, CHCl2. CHCl. CHCl. CH2Cl (liquid and solid), CHCl2. CCl2. CCl2. CCl2. CCl2. CHCl2, CCl2 = CCl. CCl3, CCl2 = CCl. CHCl2, CHCl = CCl. CHCl2 (cis and trans), CCl2 = CCl. CCl2. CHCl. CCl3, CCl2 = CCl. CHCl. CCl2. CCl3, CCl2 = CCl. CCl2. CHCl. CHCl2, CHCl = CCl. CHCl. CHCl. CCl2. CHCl2, CCl2 = CCl. CCl = CCl. CCl3 (P), CCl2 = CCl. CCl2. CCl2. CCl = CCl2 (P) and CCl3. CCl = CCl. CCl = CCl. CCl3 (P).Hydrogen vibrational frequencies (in particular valency frequencies) may be distinguished, which are characteristic for the groups —CHCl2, —CHCl— and CH2Cl— in saturated polychloro compounds (in which these groups are attached to chains of varying lengths with masses considerably exceeding that of chlorine). The valency frequency v(CH) in CHCl2— is about 40—50 cm−1 higher than that in ‐CHCl‐. It is probable that this difference must be ascribed to mutual interactions between hydrogen with chlorine of the same group and with chlorine atoms attached to neighbouring carbon atoms.v(CH) for H attached to C = C in unsaturated compounds is considerably higher than v(CH) in saturated compounds. This increase must apparently be ascribed to a direct influence which the C = C double bond exerts on the C ‐ H bond (electron displacements). v(CH) vibrations in groups CHCl2‐ and ‐CHCl‐ retain in general about the values they possessed in the same groups in saturated compounds. Some general remarks are made regarding the influence of a continued substitution of H by Cl in methane on the sign and the magnitude of the charge present on the atoms of hydrogen.Chain vibrational frequencies “v(C‐C)” in saturated, “v(CC)” and “v(C‐C)” in unsaturated compounds are discussed. The introduction of a double bond in a saturated polychloro compound results in an increase of the “v(C ‐ C)” chain vibrational frequencies also.A comparison of “v(C ‐ Cl)” for Cl bound to C = C with “v(C ‐ Cl)” for Cl attached to C ‐ C in otherwise identical compounds containing only one atom of chlorine (or halogen), permits us to draw the conclusion that v(C ‐ Cl) is larger for Cl bound to C = C than for Cl at C ‐ C. The phenomenon of resonance in the unsaturated halogen compounds is at least partially responsible for this increase, as it causes the C‐Cl bond in the unsaturated compounds to possess a certain amount of double bond character.In general we did not meet indications of the presence of rotational isomers caused by a restricted rotation around the C ‐ C single bond. Exception must be made for CHCl = CCl. CHCl2 (“cis”) and for the compounds C5Cl8 and C5Cl10, where such a hindered rotation plays a role in all probability.