bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Aggregation of Calf Thymus Histone
Authors: Ui Nobuo 
Published: July 2006

Abstract
The aggregation reaction of histone I, i. e., the main fraction of calf thymushistone, was studied by means of sedimentation, diffusion, viscosity measurement and electrophoresis. The aggregation was found to proceed usually at a temperature higher than 20°C, although it occurred at pH’s above 7 even at 0°C. High temperature, pH, ionic strength or protein concentration promoted the reaction. It was also found that sulfate ion was an effective aggregating agent.
The aggregation was not reversed by lowering the temperature, but disaggregation occurred when the ionic strength of the solution containing the aggregate was reduced by dialysis.
The aggregate was rather large in size. It consisted of about 30 molecules of his-tone I under certain aging conditions (pH 5.0) and had nearly the same frictional ratio as that of the monomer. Electro-phoretic mobility slightly increased with aggregation at pH 5.0.
On the basis of the data presented, a possible mechanism in forming the aggregate was discussed.
Spectrochemical Study of Microscopic Crystals. XVI. Structure of Cupric Formate, Acetate and Propionate
Authors: Yamada Shoichiro , Nakamura Hiroji , Tsuchida Ryutaro 
Published: July 2006

Abstract
Dichroisms in the visible and the ultraviolet region have been determined by the microscopic method with cupric formate tetrahydrate, cupric acetate monohydrate, anhydrous cupric propionate and its mono-hydrate.
The cupric formate shows an absorption band at about 38–391013/sec. which is considered to be due to the copper ion in combination with the ligands. For this band, electric vector is much more strongly absorbed along the plane of the complex than in the direction normal to the plane. The dichroism and the absorption spectrum of the cupric formate are of the same type as those of most cupric complexes involving no special effect upon the complexes.
Cupric acetate monohydrate, anhydrous cupric propionate and its monohydrate show an absorption band of a new kind at about 80×1013/sec., in addition to a band at about 43×1013/sec. which corresponds to the band at about 40×1013/sec. of the cupric formate. The polarization for the band at 80×1013/sec. is the reverse of the polarization for the band at 43×1013/sec. From the appearance of the new band at 80×1013/sec. and the reversal of the polarization property with this band, it has been concluded that the cupric compounds examined in this work, except the formate, consist of dimeric molecules having a structure similar to that of cupric acetate monohydrate.
It has also been shown that the water of crystallization has very little effect upon the linkages within the complex molecules. The cupric compounds, except the formate, show in organic solvents a band at 80×1013/sec., involving the dimeric molecules in solution.
The Vapor Pressure of Germanium Dioxide
Authors: Shimazaki Eiichi , Matsumoto Noboru , Niwa Kichizo 
Published: July 2006

Abstract
The apparent vapor pressure of solid germanium dioxide, or the dissociation pressure for the reaction GeO2(c) = GeO(g)+1/2 O2(g), was measured over the temperature range 1,040 – 1,100°C by the Knudsen’s effusion method; the results are expressed by equation (4).
From the free energy equation, the heat of reaction, the free energy and the entropy change of the reaction were calculated as ΔH298=121.7±0.3kcal./mol., ΔG298=101.7kcal./mol. and ΔS298=67.3 e.u., respectively. The heat of reaction is in good agreement with the value calculated from accessible thermal data. The normal entropy of solid germanium dioxide was calculated as S298=10.8±1.0 e.u., which is in agreement with the computed value obtained by Bues and von Wartenberg.
Rapid Separation of Radioactive Strontium by Solvent Extraction with TTA-Hexone
Authors: Kiba Toshiyasu , Mizukami Shigeru 
Published: July 2006

Abstract
Radioactive strontium in mixed fission products could be rapidly separated by the two-step extraction deviced by the authors. The solution of the material was first adjusted to pH 7 and extracted with 0.05 m TTA-benzene. By this treatment rare earths and yttrium were made to go into the organic phase out of the solution. The remaining aqueous phase was transferred into another separatory funnel, adjusted to pH 8, and extracted with 0.05 m TTA-hexone. In this case the radioactive strontium was completely extracted into the organic phase. Only less than 5% of ruthenium present in the solution was extracted at the same time. Detailed data of the experiments on the extraction involving the determination of distribution coefficient, and the equilibrium constant were tabullated.
Electronic Structure of Phenol
Authors: Nishimoto Kichisuke , Fujishiro Ryoichi 
Published: July 2006

Abstract
The electronic structure and spectra of phenol was studied from the semi-empirical point of view, using the LCAO-ASP-CI-MO method. The excitation energies and oscillator strengths of transitions to lower excited states were calculated. The agreement between the calculated and the observed values is very good. The charge distribution, bond orders and the π-electronic dipole moment are also calculated.
Studies on the Thermal Decomposition of Cellulose Nitrate by Means of the Recording Thermal Balance
Authors: Abe Takehiro , Tobisawa Sh\={o}taro , Nomura Y\={o}kan 
Published: July 2006

Abstract
(1) The cellulose nitrate containing 10.6% of nitrogen decomposes above about 160°C. There appear distinct breaking points on the decomposition curves at constant temperatures slightly above the decomposition point. The higher the constant temperature of reaction, the greater becomes the decomposition loss in weight.
(2) The thermal decomposition after preheating at a temperature slightly below the decomposition point for an hour or so gives a greater loss of decomposition than that without preheating.
(3) The cellulose nitrate kept previously under a reduced pressure of about 10−2mmHg yields a greater decomposition loss in weight than that without any treatment.
Studies on the Separation of Alkaline Earth Elements. V. Coprecipitation of Radium in the Induced Precipitate of Lead Sulfate
Authors: Shinagawa Mutsuaki , Murata Toshifumi 
Published: July 2006

Abstract
A solution of pH 5.50 composed of 0.096 m lead nitrate, 2.07 m ammonium acetate, 1−5×10−4 m barium and 5–50 μC radium per liter, produces an induced precipitate of lead sulfate in proportion to the amount of 0.5 m sulfuric acid added. Under the same conditions, in the absence of barium, a lead sulfate precipitate is obtained in proportion to the amount of sulfuric acid added. But the required amount of sulfuric acid to obtain the same amount of precipitate is larger in this case than that in the case of induction by barium.
In both of the above cases, the ratio of the amount of the radium coprecipitated to the original amount of radium in sample solution is almost constant, i. e. 92–97%, irrespective of the amount of lead sulfate precipitate or of sulfuric acid added. This tendency is the same as in the case of coprecipitation of barium with the induced precipitate of lead sulfate as shown in the previous paper. More than 90% of radium is carried down by a precipitate of lead sulfate of 8–20% of lead. Such an extent was not found in the case of the ordinary precipitation of lead sulfate, i. e. in the absence of the masking agent, ammonium acetate for lead ions.
In conclusion, the induced precipitation of lead sulfate by barium can be made use of as an efficient method of separation or concentration of radium. For a practical usage of this method, more detailed examination according to each sample should be conducted.
On the Ring Opening Reaction of ε-Caprolactam Derivatives
Authors: Yumoto Hirosuke , Ida Kenzaburoh , Ogata Naoya 
Published: July 2006

Abstract
The ring-chain equilibria,
(Remark: Graphics omitted.)
were investigated experimentally for ε-caprolactam derivatives and their results could be analyzed by the method similar to that for ε-caprolactam. For the monomethyl derivative the equilibrium shifts to the ring-form and ΔH has been estimated to be 2.3 kcal/mol. which is smaller than ΔH(=3.5 kcal/mol.) for the unsubstituted. For dimethyl and N-methyl or -methylol derivatives equilibria shift too much to the ring-form to give polymers at high temperatures. The average unit of the Brownian motion of polymer chain molecules, i. e. the segment, for the monomethyl derivative is 13.3 skeleton atoms which is smaller than 19 skeleton atoms for unsubstituted polycapramide; the substitution makes it easier for chain molecules to be kinky.
Study of Nickel Oxide-Kieselguhr Catalyst. IV. The Effect of Temperature upon the Initial Rate of Polymerization and the Amount of Initial Adsorption of Propylene
Authors: Kawaguchi Shinichi 
Published: July 2006

Abstract
The catalytic polymerization of propylene over a nickel oxide-kieselguhr catalyst was studied at constant volume and at 0, 20, 80, 100, 110.6 and 140 °C. The pressure-time curve was analyzed by means of the Zeldowitch type equation. The initial rate law, R0=k(v–v0), can again represent the data at 0 and 20°, but the ineffective amount of initial adsorption, v0, becomes zero at higher temperatures, resulting in a simple first-order rate law, R0=kv. The activation energies obtained between 0 and 20°, and among higher temperatures are 8.7 and 0.86 kcal./mole, respectively. The isosteric heats of initial adsorption are 7–8 and 1.9 kcal./mole in the respective temperature regions. The elementary process whose initial rate was measured is considered again to be slow chemisorption of propylene from the van der Waals layer onto the active site of the catalyst.
The Dielectric Properties of Thiacyclohexane
Authors: Kondo Seiichi , Matsumoto Masaru 
Published: July 2006

Abstract
1) The molecules are in the rotational states in the solid phases II, III and liquid phase, and not in the phase I.
2) There is an order-disorder transition in phase II which may have its origin in the molecular dipole rotation.
3) The dielectric behavior in phase III is similar to that of other polar plastic crystals.
Solvent Effects on the Fluorescence of Some π-Electron Systems Naphthylamine and Naphthol
Authors: Mataga Noboru 
Published: July 2006

Abstract
The enhancement or quenching of fluorescence intensity of naphthylamines and naphthol caused by hydrogen bonding with acetic acid esters or pyridine has been measured. By means of detailed analyses of the experimental results, it has been established that the shift of hydrogen bonding equilbrium toward the side of association is realized during the lifetime of excited state.
The cause of the shift has been interpreted on the basis of the theory of electron migration, and an evidence supporting the interpretation has been provided by measuring the solvent shift of fluorescence spectra. The mechanism of the fluorescence quenching has been discussed as due to the delocalization of π-electrons through the hydrogen bond.
Capture of Radioactive Cesium onto a Phosphomolybdate Precipitate Layer and its Determination
Authors: Hara Tadashi 
Published: July 2006

Abstract
(1) Up to 500 μg. cesium dissolved in less than 2 liters of solution is quantitatively captured on the precipitate layer by filtering the cesium solution through it.
(2) The activity on the precipitate is proportional to the amount of cesium-137 present in the solution and consequently, the quantity of cesium-137 is easily determined.
(3) The mechanism of capturing cesium on the precipitate layer is believed to be due to the ion exchange phenomenon.
(4) Determination of the radioactive cesium by this method is not interfered with by the presence of a large amount of various substances except rubidium, cesium, thallium, tungstate and nitrite. Radioactive strontium and rare earth elements also interfere, but their interference may be prevented by pretreatment.
(5) Recovery of the radioactive cesium dissolved in one liter of either river or sea water are about 93%.
The Formic Acid Rearrangement of 2-Cyclohexyl-3-butyn-2-ol
Authors: Takeshima Tatsuo , Wakamatsu Kazuo , Furuhashi Akira 
Published: July 2006

Abstract
The formic acid rearrangement of ethynylcarbinols has been extended to 2-cyclohexyl-3-butyn-2-ol(II), a model carbinol in which the tertiary carbon atom and the methyl group are adjacent to the carbon atom attached to the hydroxyl group. The major rearrangement product consisted of a mixture of 3-cyclohexylidene-2-butanone(III) (ca. 28% yield) and a new aldehyde, 3-cyclohexyl-2-butenal(IV) (ca. 12% yield). The latter was hydrogenated to give 3-cyclohexylbutyraldehyde(V). These compounds were isolated and characterized.
Studies of Aggregation of Dodecylammonium Carboxylates in Carbon Tetrachloride by Infrared Absorption Spectra and Thermistors
Authors: Kitahara Ayao 
Published: July 2006

Abstract
Measurements of infrared absorption spectra and of vapor pressure depressions using a couple of matched thermistors were carried out with carbon tetrachloride solutions of dodecylammonium carboxylaf at varying concentrations. The absorption bands at 1710 and 1640 cm−1 were assigned to the carbonyl group of the monomer molecule which is formed by hydrogen bonding between amine and acid, and to the NH3+ group of ammonium salt resulting from the aggregation, respectively. The equation which was derived from the Beer’s law and the aggregation equilibrium made it possible to calculate the true aggregation number λ using the values of absorbance at each absorption band.
Alternatively, the λ was calculated by means of the Kreuzer’s equation from the apparent mean aggregation number Z which was obtained using thermistors. The agreement between the λ’s obtained by the spectral and thermistor methods was satisfactory as for the order of magnitude. The cmc was tentatively estimated by both spectral and thermistor method.
The agreement between the cmc’s obtained by these independent methods was good. But these cmc’s did not show good agreement with those obtained from solubilization.
Synthetic Amphoteric Polypeptide. III. A Water-Soluble Amphoteric Polypeptide
Authors: Yuki Heimei , Okawa Kenji , Tani Hisaya 
Published: July 2006

Abstract
1. Preparation of four copoly-(l-glutamic acid, Dl-serine), the molar ratios of the two amino acid residues were 4:1, 3:2, 2:3 and 1:4, by debenzylation of the corresponding four copoly-(γ-benzyl l-glutamate, O-benzyl Dl-serine), was attempted.
2. The inter- and/or intra-molecular ester-linkages, formed during the debenzylation reaction between hydroxyl group of serine residue and carboxyl group of glutamic acid residue, was broken by treating with aqueous triethylamine without accompanying racemisation or hydrolysis of the peptide bond.
3. Copoly-(l-glutamic acid, Dl-serine) became freely soluble in water when the content of serine residue was more than about 50 mole per cent.
4. Copoly-1:1:2-(l-glutamic acid, l-lysine, Dl-serine), prepared by debenzylation from the parent copolymer, was soluble in water over a whole pH range, and the pH dependence of viscosity and of optical rotation was measured on its solutions. It was found that these properties are very similar to those of natural albumins.
The Ignition of Hydrogen-Oxygen Mixture by Shock Wave. II. Measurement of the Pressure and the Volocity of Shock or Detonation Wave
Authors: Suzuki Momotaro , Miyama Hajime , FujiMoto Shiro 
Published: July 2006

Abstract
We have carried on a series of experiments on the shock ignition of a gaseous mixture 2H2+O2 by using a shock tube equipped with pick-ups, which can be used for measuring the pressure and the velocity of shock or detonation waves. The results are summarized as follows:
1) When the pressure P0 of a gaseous mixture is higher than 200 mmHg, the ignition starts between the membrane and the first pick-up along the test chamber and the detonation becomes stable before the detonation wave arrives at the first pick-up.
2) In case P0 is lOO mmHg, the detonation is initiated by an incident shock wave in some cases and by a reflected one in other cases.
3) When P0 is higher than 200 mmHg, the pressure of the detonation wave initiated by shock ignition increases along with the increase of P0 but its velocity decreases with a similar increase.
Dielectric Contribution to Miscibility in the Ternary System 1-Propanol-Water-Toluene
Authors: Somasundaram K M , Suryanarayana C V 
Published: July 2006

Abstract
In place of the familiar equation \undersetkΣPkxk=P1,2···k, which does not hold good in many-cases, we have formulated alternatively the equation \undersetkΣPkxk=P1,2···k where L is volume polarization. This equation has been applied to the ternary system 1-propanol-water and toluene just at the point of miscibility, when to a given ratio of toluene and water addition of an optimum amount of 1-propanol results in the disappearance of the phases. Also the new equation has been applied to two fully miscible binary systems 1-propanaol-water and 1-propanol-toluene. It has been concluded that the new equation gives a condition concerning the dielectric contribution of the components to miscibility in the ternary system.
Studies on the Interaction of Surface Films with Solute in Solution. II. Sorption of Dye on the Built-up Film of Stearic Acid and Barium Stearate
Authors: Muramatsu Mitsuo 
Published: July 2006

Abstract
The amounts of dyes sorbed on the built-up films of stearic acid and of barium stearate were measured, under varying pH of the dye solutions into which the films were immersed. It has been observed in general that the amount of sorption was greater when the molecular weight of dye became greater. Nonionic attraction such as van der Waals’ force, which is considered to be a cause of interaction between dye molecules themselves, and aggregate formation among them may also be responsible for the interaction between dye and built-up film. Such an interaction may be favored by the decreasing ionic charges of the same sign existing on dye molecule and film.
Acid dyes proved to be increasingly sorbed with decreasing pH until the aggregates of dye grew so large that they fell from the interface as a precipitate. The difference in detailed behaviors for sorption of several acid dyes could be explained by the difference in the strength of repulsive force of dye ions, suppressing the attraction, as well as of van der Waals force which was considered to be largely affected by molecular weight.
In the case of basic dyes, ionic attraction is additionally taken into account to explain their sorption on the film of stearic acid. This has been suggested by the correlation between the degree of ionization and sorbed amount of chrysoidine, and supported by the fact that the built-up film of barium stearate took up less crystal violet than that of stearic acid did.
In the case of the sorption of amphoteric dyes, a maximum was observed in general in a pH range which is roughly in agreement with an isoelectric region of dye. Tentative explanations have been made for this phenomenon, taking account of a change in the dissolved state of dyes.
Kinetics of the Reaction between Copper(II)-Ethylenediaminetetra-acetate Complex and Cyanide
Authors: Tanaka Nobuyuki , Kamada Minoru , Murayama Teisuke 
Published: July 2006

Abstract
The reaction between copper(II)-ethylenediaminetetra-acetate complex and cyanide ion has been investigated by measuring the change of the polarographic diffusion current of the complex as a function of time after the initiation of reaction.
The rates of the reaction obtained with various concentrations of Cu(II)-EDTA complex, cyanide and unchelated EDTA showed that the reaction is of second order on the concentration of the Cu(II)-EDTA complex, fourth order on that of the cyanide and first order on the reciprocal of that of the unchelated EDTA. The reaction mechanism proposed is
(Remark: Graphics omitted.)
and the rate of the reaction is expressed as
(Remark: Graphics omitted.)
The value of k1k3/k2 was determined to be 6.8×107 1.4 mole−4sec.−1 in a carbonate bicarbonate buffer of pH 10.0, at ionic strength 0.5 and at 25°C.
Studies on the Mannich Reaction. II. On the Formation of Piperidine Derivatives (2)
Authors: Uchino Norito 
Published: July 2006

Abstract
1) The mechanism of the reaction of phenyl vinyl ketone with β-benzoylethylamine hydrochloride was discussed.
It was concluded that the β-carbon atom of phenyl vinyl ketone combined with β-benzoylethylamine hydrochloride on attacking the lone pair of electrons which appeared in consequence of prototropy, and gave the same products as those in the Mannich reaction.
2) In the Mannich reaction, piperidine bases are found to be produced.
It was concluded that the phenyl vinyl ketone, which was produced by decomposition of the products in the Mannich reaction, was concerned with the formation of these piperidine bases.
Analytical Chemistry by Means of Organic Compounds. XXV. 1-Hydroxyacridine as a New Reagent (Neo-oxine) (1)
Authors: Ishibashi Masayoshi , Yamamoto Yuroku , Yamada Hirohiko 
Published: July 2006

Abstract
The absorption spectra of 1-hydroxyacridine were obtained both in aqueous and chloroform solution, and the pKa and the pKb were determined. The pKa is slightly greater than that of oxine, and it is suggested that the stability of metal chelate with 1-hydroxyacridine will have values of the same or larger order as that of oxine chelate, because there is a direct relation between the basicity of a chelating agent, as measured pKa values, and the stability of the chelates it forms, as cited in the literature of Morrison and Friser.
The various aspects of solvent extraction using chloroform were then investigated. The optimum pH range on extraction for each element was determined and it was found that the range is narrow as compared with that of the oxine chelate. The per cent extracted was determined and it was found that copper, nickel, cobalt and zinc were almost completely extracted under the conditions investigated.
Enzymic Preparation of Guanosine-2′,3′-cyclic Phosphate, Inosine-2′,3′-cyclic Phosphate and Xanthosine-2′,3′-cyclic Phosphate
Authors: Sato-Asano Kimiko , Fujii Yoshiko , Egami Fujio 
Published: July 2006

Abstract
By RNase T1 digestion, guanosine-2′,3′-cyclic phosphate was obtained with good yield from yeast RNA, and two new compounds, inosine-2′,3′-cyclic phosphate and xanthosine-2′,3′-cyclic phosphate were obtained from deamino-yeast RNA. The properties of the new compounds were studied.
Polymerization of Methyl Methacrylate Initiated by a Combined Action of Di-p-tolylsulfonylhydroxylamine and Oxygen in Air
Authors: Uehara Ryoichi 
Published: July 2006

Abstract
The polymerization of methyl methacrylate is initiated by a combined action of di-p-tolylsulfonylhydroxylamine and oxygen. The polymerization is accelerated with dimethylaniline and retarded with hydroquinone. The initial rate of polymerization is linearly dependent upon the square roots of concentrations of di-p-tolylsulfonylhydroxylamine and dimethylaniline in air. The reciprocal of the average degree of polymerization of the polymethyl methacrylate formed by means of the present initiating system is proportional to the square root of the initial concentration of di-p-tolylsulfonylhydroxylamine.A copolymer (1 : 1) is obtained from an equimolar mixture of styrene and methyl methacrylate. These facts suggest that the polymerization is initiated by a radical produced from the initiating system.