bluuebunny/crossref_metadata_2025_split huggingface dataset:
Studies of Water‐Soluble Polysaccharides from Red Seaweeds (Pterocladia Tenuis Okam. and Bangia Fusco‐Purpurea Lyngb)
Authors: Wu Ya‐Chen , Ho Hon‐Kai 
Published: June 2015

AbstractExistence of D‐galactose and 3,6‐anhydro‐L‐galactose in the polysaccharide obtained from Pterocladia tenuis was confirmed. The polysaccharide extracted from Bangia fusco‐purpurea was fonud to consist of DL‐galactose, 3,6‐anhydro‐L‐galactose and 6‐0‐methyl‐D‐galactose. Results of studies on these polysaccharides with methods of periodic oxidation or partial hydrolysis were reported with the suggestion that the main part of the polysaccharides extracted from pterocladia tenuis Okam might be built up from a repeating unit like agarobiose structure.
Spectrophotometric Determination of Uranium with Ammonium Aurin Tricarboxylate
Authors: Lai T. T. , Chang T. L. 
Published: June 2015

AbstractFor the purpose of developing a sensitive and precise spectrophotometric method for uranium determination, the reaction of uranium (VI) with aluminon, ammonium salt of aurintricarboxylic acid, was rigorously examined. Uranium reacted with aluminon to give a pink color absorption complex with the maximum absorbance at 535 mμ and optimum pH of 4.0 to 4.8.The presence of two kinds of absorption complex, UO2++‐ATA and (UO2++)2‐ATA, was proved, the electromigration tests for both were shown to be negative. The molar extinction coefficient of UO2++‐ATA was found to be 7400 and that of (UO2++)2‐ATA, 12000, with the instability constants of 5.0×10−7 and 2.8×10−12 respectively. The practical sensitivity was 0.5 to 1 p.p.m. The color reaction was also found to conform with Beer's law, and the intensity did not change within four weeks.
Magnetic Susceptibilities of Ions of the Iron Group as Sulfates in Aqueous Solutions
Authors: Huang Kun‐Po , Lin Wei‐Chuwan 
Published: June 2015

AbstractMagnetic susceptibilities of some iron group metal sulfates were measured after the semi‐differential Gouy method. The results were listed in Tables I, II, and III, and also illustrated in Fig. 1 and 2. No significant changes in susceptibilities were observed for CoSO4 and NiSO4 in the aqueous solutions, while in the Fe2 (SO4)3 solution, the hydrolysis proceeded to a considerable extent, leading to the formation of strongly diamagnetic hydrolysis product which diminished the apparent magnetic moment of Fe+++ considerably at big dilution and at low acidity.
Polarographic Studies of Uranium in α‐Hydroxy‐Iso‐Butyrate Medium
Authors: Wong Wen‐Kuei , Pan Kuan 
Published: June 2015

AbstractUranyl perchlorate in aqueous solution containing α‐hydroxy‐iso‐butyric acid (HA) and sodium perchlorate was observed at varying pH's. Two reduction waves with half‐wave potentials at −0.22 and −0.95 volts vs. S. C. E., observed at pH below 3.0, are attributable to the polarographic reductions, UO2+++e→UO2+ and UO+++e→UO+, or UOOH++e→UOOH, while the first wave observed above pH 3.0 or in large excess of HA above pH 2.0, may be attributable to the reduction of UO2A+ complex and the third wave at −1.2 volt vs. S. C. E. to that of UOA+ complex or its dimer. A confirmation for the latter was made by polarographic reduction of uranous sulfate in HA and NaClO4 solution.
Determination of Thorium and its Separation from Rare Earths in Monazite Sand
Authors: Chang Tiao‐Hsü 
Published: June 2015

AbstractA new method based on precipitation from homogeneous solution and devised for the separation and determination of thorium in monazite sand, consists of four step3: decomposition of monazite sand with sulfuric acid, removal of phosphate radical by washing with alcohol, precipitation of thorium, rare earths and some other constituents in monazite sand with ammonium carbonate in the presence of tartaric acid, and separation of thorium from the rare earths by the hydrolysis of urea in the presence of formic acid. The separation of thorium from a small amount of other constituents associated with the basic thorium formate, is easily carried out by oxalic acid method at the last operation. Approximately ninety‐five per‐cent of phosphate radical can be removed with alcohol. After the removal of phosphate radical, the determination of thorium and its separation from the rare earths is very much simplified. The formation of dense, easily filtered and washed precipitates result in a more accurate and rapid method.
Reaction of Halogen Compounds on DisodioSuccinosuccinic Ester. II. Further Notes on the Reaction with Iodoacetic Ester
Authors: Chang Daniel Y. , Liu Tien‐Chih , Wei Yun‐Tsung , Kung Wen‐Shen , Sun Wen‐Kim 
Published: June 2015

AbstractAdditional evidences have been found to support the view that two of the crystalline products resulting from the reaction between iodoacetic ester and disodiosuccinosuccinic ester, those with melting points 106°, and 60°, consisted of stereoisomers. In the first place, the infrared spectra of both substances bear close resemblance Secondly, the keto acids that were obtained by ketonic cleavage of these substances could be converted into identical products and, when reduced by the Wolff‐Kishner method modified by Huang Minlon, they furnished the same cyclohexane‐1, 4‐bis‐[acetic acid]. The determination of the molar polarization of the crystalline substances at different temperatures showed that neither the substance with m. p. 106° nor that with m. p. 60° had a center of symmetry in its molecule. These substances also had almost equal dipole moments. These results are briefly discussed. The decomposition reactions of the substances with m. p. 106° and 60° when heated with sodium iodide have been found to be a general reaction characteristic of β‐ketonic esters.
Identification of the Products from the Reaction of o‐ and p‐Iodophenyl Acetate with Aluminium Chloride
Authors: Chang Chin‐Te , Chen Fa‐Ching 
Published: June 2015

AbstractThe products, (I) m. p. 69‐71° and (II) m. p. 171‐172°, obtained from the reaction of o‐ and p‐ iodophenyl acetate with anhydrous aluminium chloride were elucidated as 2,4‐diiodophenol and 3,5‐diiodo‐4‐hydroxyacetophenone respectively. Suitable methods for the preparation of diiodophenol and diiodohydroxyacetophenone were also described.
Paper Electrophoretic Studies of the Electrolytic Behavior of Quadrivalent Metal Ions
Authors: Pan Kuan , Wong Wen‐Kuei , Chiang Shu‐Chi 
Published: June 2015

AbstractThe electrical migration of tetra‐valent metal ions, Ge[IV], Ti[IV], Zr[IV], Th[IV] and U[IV] was observed by means of paper electrophoresis, using tartaric acid and tartrate or acetic acid and acetate buffers as background electrolytic solutions. These metals formed with the tartrate negatively charged complex ions which migrated toward the anode, but not with the acetate except the U[IV] ion, which was gradually oxidized to UO2+2 ion and then formed complexes with the acetate.The ratio of ionic radii of tartrate complexes was approximately estimated from the ratio of their migration distances under the same conditions.
Study of the Extractive Constituents from the Wood of Libocedrus Formosana, Florin III. Isolation of Chaminic Acid, Acid C and Acid E
Authors: Lin Yau‐Tang , Lo Tung‐Bin , Cheng Yu‐Shia 
Published: June 2015

AbstractThree additional crystalline acids; acid D, m. p. 105–106° acid E, m. p. 54–55° and acid C, m. p. 95–96° were isolated from the extractives of the wood of Libocedrus formosana Florin in which acid D was confirmed to be Chaminic acid.
The Essential Oil of Chamaecyparis Taiwanensis Masamune et Suzuki, IV. The Phenolic Parts
Authors: Lin Yau‐Tang , Wang Kung‐Tsung 
Published: June 2015

AbstractThe phenolic parts of the essential oil of Chamaecyparis taiwanensis were separated by powdered polyamide column chromatography. The fractions showed the presence of seven spots on polyamide impregnated paper chromatogram. Four of these spots were identified as carvacrol thymol, chamaecin and m‐isopropylphenol respectively. The main phenol was m‐isopropylphenol which was campared directly with the synthetic sample.
Kinetic Studies of the Photochemical Reduction of Uranyl Sulfate in the Presence of Alpha‐Hydroxy Iso‐Butyric Acid (I)
Authors: Pan Kuan , Wong Wen‐Kuei 
Published: June 2015

AbstractThe photochemical reduction of U(VI) to U(IV) sulfate in the presence of α‐hydroxy iso‐butyric acid, accompanied with the decarboxylation and oxidation of the acid to acetone was observed. The reaction rate was found to be of the fourth order, or of the pseudo first‐order with respect to the U(VI) ion concentration in an excess of the acid by following spectrophotometrically the concentration of U(IV) ion produced. A fourth‐order rate equation has been derived.
A Study of the Solvent Extraction of Thorium with Thiocyanate
Authors: Chen Ying‐Mao , Sun Peng‐Joung , Chou Fa‐Chun 
Published: June 2015

AbstractA study of the effects of organic solvents, acidity and the Concentration of thiocyanate on the effectiveness of the solvent extraction of thorium has been undertaken. It has been found that both cyclohexanol and a mixture of isoamyl alcohol and ethyl acetate were effective solvents, and the most favorable acidity for the extraction of thorium was at pH 4, and the extractability of thorium increased with increasing thiocyanate concentration, reached a maximum value when thiocyanate concentration was 3N, and then decreased slightly.
Chelatometric Titration of Bismuth with Gallein Indicator
Authors: Sun Peng‐Joung 
Published: June 2015

AbstractA method using gallein as indicator for the direct titration of bismuth with disodium salt of EDTA was devised. The titration was carried out in nitric acid. The optimum pH for the titration was found to be at pH. 1.3 to 2.3. The sharpest end point occurred at around pH 1.7.The end point was reached when the magenta color gave place to a pale yellow. The interference of approximately equimolar concentration of various foreign ions was studied.By the proposed method bismuth can be accurately titrated in the presence of a variety of both cations and anions including large amounts of lead ions.
Lithium Aryls. I. Preparation of p‐Cyclohexenyl‐Phenyllithium by Halogen‐Lithium Interconversion Reaction
Authors: Chang Daniel Y. , Yu Ruey‐Jiin 
Published: June 2015

AbstractThe halogen‐lithium interconversion reaction between p‐bromophenyl‐cyclohexene‐1 and organolithium compounds was investigated. It resulted in the production of p‐Δ1‐cyclohexenyl‐phenyllithium. The organolithium compounds used in the interconversion reaction were phenyllithium, n‐propyllithium and n‐butyllithium. They brought about 25%, 19% and 10% conversions based on p‐bromophenylcyclohexene‐1 respectively.
Essential Oils. X. Elsholtziaketone and Naginataketone, the Main Constituents of a New Perilla Oil
Authors: Yeh Ping‐Hsien 
Published: June 2015

AbstractPerilla naginataketoniferum afforded, on steam distillation, 0.4% essential oil, of which the constituents were 2.4% (‐)‐limonene, 48.9% elsholtziaketone, 36.7% naginataketone, 8.6% α‐caryopyllene, small amount of dipentene and acids.The structure of naginataketone was elucidated as 1‐(β‐methyl‐α‐furoyl)‐2‐methyl‐1‐propene.The taxonomical relationships between various species of perilla grass were discussed in the light of the possible routes by which the biosyntheses of the particular main constituents in the oil might be brought about in the plant of the Perilla Genus.
Ultra‐Violet Absorption Spectra of Aniline, β‐Naphthylamine and β‐Naphthol
Authors: Lin Tetz Che‐Shung , Lin Wei‐Chuwan 
Published: June 2015

AbstractUltra‐violet absorption spectra of aniline, β‐naphthylamine and β‐naphthol were studied qualitatively, by taking advantage of the effects due to the presence of a proton‐acceptor reagent, p‐dioxane, in various solvents with different dielectric constants.
Chelatometric Titration of Lead with Gallein Indicator
Authors: Sun Peng‐Joung 
Published: June 2015

AbstractTwo methods using gallein as indicator for the direct titration of lead with disodium salt of EDTA have been developed. In one method, the titration of lead was effected in a weakly acidic medium, using pyridine or hexamethylene‐tetramine as buffer. The optimum pH for the titration was found to be at pH 5.5 to 6.0.Gallein indicator undergoes color change from purplish blue to red. In proceeding the titration within the pH range mentioned above, and in the presence of equimolar concentration of magnesium and alkaline earth metals as well as monovalent cations, no interference was observed.In the other method, the titration of lead was carried out in the presence of Rochelle salt, using ammonia and ammonium chloride buffer to keep the solution at PH 10. Sharp color change from violet to deep magenta red was observed at the end point. Only univalent cations, such as sodium, potassium, lithium, ammonium or silver did not show interference with the titration. The use of some masking agents has also been demonstrated.
Reactions of Tropolonoid Substances. II. Replacement of Bromine Atom on Tropolone Nucleus by Chlorine and Iodine
Authors: Sebe Eigai , Matsumoto Satoshi , Kasuga Seiki 
Published: June 2015

AbstractBromotropolone derivatives, when heated with acetic anhydride and acetyl chloride, afforded acetylated chlorotropolone derivatives. Similarly, the reaction between bromotropolone derivatives and hydriodic acid gave the corresponding iodotropolone derivatives. The reactivity of various bromotropolone derivatives in view of the replacement of bromine atoms by chlorine or iodine atoms was extensively investigated.
The Effect of Water on the Reaction of Metal Halides with Organic Acids at Higher Temperatures
Authors: Lin Lung Ching , Yeh Ping‐Yuan 
Published: June 2015

AbstractEvolution of hydrogen chloirde occurs when an organic acid which tends to undergo intramolecular dehydration at elevated temperatures is heated with dried sodium chloride at 150°. Aliphatic and aromatic monocarboxylic acids are not acted upon under the same conditions. However, when mono‐ or polycarboxylic acids having a pKa<5.3, are heated with solid calcium chloride dihydrate, the above reaction takes place much more rapidly with the evolution of hydrogen chloride. Calcium chloride is also found to induce elctrophilic aromatic iodination without the presence of any oxidizing agent.
Studies of Benzofurans as Potential Antimicrobial Agents I. Synthesis of Coumarilic Acid and its Derivatives
Authors: Pan Foo , Wang T. C. 
Published: June 2015

AbstractCoumarilic acid and its functional derivatives, including sixteen compounds hitherto unknown, have been prepared for antimicrobial evaluation. A preliminary antifungal test indicated that some of the derivatives were highly active. The details on their antibacterial as well as antifungal properties will be reported later.
Polyamide Thin‐Layer Chromatography
Authors: Wang Kung‐Tsung 
Published: June 2015

AbstractPaper chromatography using the polyamide impregnated paper were reviewed. The method for preparing plates coated with a thin‐layer of polyamide for chromatographical work was devised. Circular polyamide plates for horizontal chromatography was also prepared. These plates were applied to the chromatography of the phenols, phenolic carboxylic acids and tropolones. The reproducibility of the chromatogram were excellent. It was found that polyamide thin‐layer chromatography is the most convenient method for the separation of phenolic substances ever found. The Rf values of phenols, phenolic carboxylic acids and tropolones are tabulated and the relations between solvents, Rf values and structure of phenols are discussed.
Intermolecular Association in Terms of Polarisation at Optical Frequency
Authors: Lin Wei‐Chuwan , Lue Ping‐Chang 
Published: June 2015

AbstractIntermolecular association in the binary mixtures of p‐dioxane with chloroform and with aniline is discussed in terms of polarisability on the basis of Böttcher's formula for the molecular refraction of mixtures.
Consecutive Chelatometric Determination of Bismuth and Lead Using Gallein as Indicator
Authors: Sun Peng‐Joung 
Published: June 2015

AbstractA new method for the simultaneous volumetric determination of bismuth and lead in the same solution with the disodium salt of ethylenediaminetetraacetic acid was proposed. By the selective control of the pH to about 1.5, the author found it possible to titrate bismuth alone, and that lead could be subsequently titrated at pH 6.0 by adding pyridine as a buffer. Gallein was exclusively employed as indicator in the titration. It underwent an end point color change from magenta to pale yellow in the titration of bismuth, and from purplish blue to red in the titration of lead.
Reactions of Tropolonoid Substances. IV. Properties of o‐Carboxy Tropolones
Authors: Sebe Eigai , Matsumoto Satoshi , Itsuno Yoshaki , Kasuga Seiki 
Published: June 2015

AbstractThe reactions of some of the o‐carboxy‐tropolones were investigated, their functional derivatives were made, and the physical properties of these derivatives were described.
Reactions of Tropolonoid Substances, V. Perchlorination of Hinokitiol
Authors: Sebe Eigai , Matrumoto Satoshi , Itsuno Yoshiaki 
Published: June 2015

AbstractThe highest number of chlorine atoms introducible into the tropolone nucleus in hinokitiol is three. The introduction of chlorine atom into isopropyl group in hinokitiol occurs when at least two atoms of chlorine have been already present in the tropolone nucleus. Chlorine atoms introduced into isopropyl group are easily hydrolyzed or eliminated as hydrogen chloride, leaving an ethylenic linkage. The chloro‐derivative of hinokitiol in which the greatest number of chlorine atoms have been introduced is pentachloro‐hinokitiol. This latter substance is rather unstable. It can be produced only in very inferior yields because in the course of its preparation aromatization reaction occurs to a much greater extent as soon as chlorine atoms are introduced into the isopropyl group. The main product is a highly chlorinated cuminic acid having six atoms of chlorine (three in benzene nucleus and the other three in isopropyl). It is easily hydrolyzed even in contact with water when all of the chlorine atoms in the side‐chain are changed to hydroxyl groups, resulting in the formation of a δ‐lactone which on treatment with alcoholic ammonia affords the corresponding lactam.
Cathodic Action of the Metal Complexes at the Dropping Mercury Electrode. VI. Uranyl‐Para‐Methylaminophenol Sulfate Complex
Authors: Lai Tsai‐Teh , Wang Bi‐Cheng 
Published: June 2015

AbstractThe complex formation of uranyl ion with p‐methylaminophenol sulfate has been studied polarographically over the pH range 1.5 to 4.7.A 1‐electron reversible reduction wave was observed in this pH range. At pH. higher than 4.7, a reduction wave of complexing agent was produced.The diffusion current is proportional to the concentration of uranyl ion from 2.0×10−4M to 5.1×10−3M. The diffusion current constant has been found to be 1.54±0.03, and the diffusion coefficient (7.96±0.2)×10−G sq. cm. per second.Two hydrogen ions, in the pH range of 1.5 to 21, and one hydrogen ion, in the pH. range of 3.4 to 4.7, were consumed respectively by the reduction of three uranyl ions. At pH 2.6 to 4.7, U(V) had one ligand less than U(VI).
Polarography and Spectrophotometry of Copper‐Glutamate Complex
Authors: Lai Tsai‐Teh , Chang Teh‐Liang , Wang Bi‐Cheng 
Published: June 2015

AbstractA deep blue colored chelate compound resulting from the reaction between copper ion and glutamate was studied polarographically and spectrophotometrically.A single reversible wave corresponding to the reduction of the copper‐glutamate complex to the Cu(I) state was observed in the pH range 4.5 to 6.7.Only one kind of chelate compound, CuG2= was detected. The electrode reaction is formulated thus CuG2= + H++e=CuG− + HG−The diffusion current constant is 3.13 for 0.2 M glutamic acid and 0.1M potassium chloride at pH 6.2.The copper‐glutamate complex (1:2) has an absorption maximum at 615 mμ. and its absorbance was constant at the wide pH range 4.2 to 9.2. Its instability constant was calculated to be 3.5×10−7.
Chelatometric Titration of Cadmium with Gallein Indicator
Authors: Sun Peng‐Joung 
Published: June 2015

AbstractIt has been found that gallein can be used as an indicator in the direct chelatometric titration of a number of metals. A method based on this fact has been devised for the chelatometric determination of cadmium with disodium salt of EDTA.The optimum pH for the titration was found to be 9.5 to 10. A buffer solution consisting of ammonia and ammonium chloride was used to keep the solution at this optimum pH in the titration. The color of indicator changed from violet to magenta red at the end point.No interference was observed in the presence of a variety of anions and univalent cations.
Lithium Aryls. II. Preparation of p‐Lithiobenzaldehyde‐Diethyl‐Acetal by Direct Metallation and Halogen‐Lithium Interconversion
Authors: Chang Daniel Y. , Yu Ruey‐Jiin 
Published: June 2015

AbstractThe direct metailation and the halogen‐lithium interconversion of p‐bromobenzaldehyde‐diethyl‐acetal by the action of lithium and n‐butyl lithium have been investigated. They resulted in the production of p‐lithiobenzaldehyde‐diethyl‐acetal with yields amounting to 11 % and 20 %, respectively, based on p‐bromobenzaldehyde‐diethyl‐acetal.
Seroflocculating Steroids. IX. New Syntheses of Ethyl 3β‐Chloro‐II‐Cholenate; other Active Compounds
Authors: Chang Frederic C. 
Published: June 2015

AbstractTwo new syntheses of the compound, ethyl 3β‐chloro‐11‐cholenate, used as the screening test standard in seroflocculation studies, are described. Additional compounds were synthesized and screened for activity.
The Effect of Sex Hormones on Cholesterol Biosynthesis
Authors: Chen Yu Min 
Published: June 2015

AbstractAn investigation was undertaken to study the effect of sex hormones on cholesterol biosynthesis by using the albino rats of the University of Southern California strain fed on three different kinds of diets: (a) Control diet, containing 15% cottonseed oil (I); (b) Diet (I) containing 1% cholesterol (II); (c) Fat‐free diet (III).By liver slice technique, the results showed the following:
In rats fed with control diet (I), the male had a much higher rate of cholesterol biosynthesis than the female; and the cholesterol biosynthesis in both male and female rats was decreased by gonadectomy as compared with the intact male and female animals on the same diet.
In rats fed with diet (II) or (III), the cholesterol biosynthesis was greatly decreased, due to the feeding of cholesterol‐containing or fat‐free diet so that gonadectomy caused no more distinct effect on the cholesterol biosynthesis.
The cholesterol biosynthesis was greatly enhanced by sex hormone administration in rats fed the three kinds of different diets.
The effect of sex hormones to increase the cholesterol biosynthesis in liver is probably their secondary influence caused by their primary influence to reduce the liver cholesterol by different mechanisms.
Kinetic Studies of the Alkaline Hydrolysis of Alkyl Acetates by Conductometric Measurements
Authors: Pan Kuan , Chang Chen‐Fee , Hong Hui‐Shong 
Published: June 2015

AbstractReaction rates for the alkaline hydrolysis of methyl‐, ethyl‐, n‐propyl‐ and n‐butyl acetates in the presence of 0.01 N sodium hydroxide solution at 15°, 20°, 25°, 30° and 35°C were followed directly by conductometric measurements of the reacting system. The energies and entropies of activation for these reactions were estimated.