bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polarographic Determination of Germanium
Authors: Pan Kuan , Sun Peng‐Joung , Wong Wen‐Kuei 
Published: June 2015

AbstractGermanium was polarographically determined in NH4OH‐NH4Cl buffer of pH 9.2 on the one hand, and in 40% ethanol solutions containing the same buffer and an excess of gallein on the other hand. The optimum concentration range for the determination of germanium was 2×10−6 to 5×10−4 molar in the former case, and 5×10−5 to 1×10−3 molar in the latter case.
Fractionation of Polvinyl Chloride
Authors: Yeh Si Jung , Chen Tsang Jan 
Published: June 2015

AbstractIn order to investigate the effect. of high energy irradiation on polyvinyl chloride, an attempt was made to examine the molecular weight distribution of polyvinyl chloride manufactured by the Formosan Plastic Co., using two solvent systems; cyclohexanone‐acetone‐methanol and mesityl oxide‐acetone‐methanol. The polyvinyl chloride was fractionated at 25°C with precipitation method into many fractions. It was found that for the preparation of fractions for the study of radiation effect, the solvent system cyclohexanone‐acetone‐methanol is preferred, because the solvent system mesityl oxide‐acetone‐methanol failed to give a good fractionation for higher molecular weight fractions of polyvinyl chloride. The molecular weight distribution of polyvinyl chloride was also discussed.
Study of the Radioactivity of Hokutolite
Authors: Hamaguchi Hiroshi , Lee Yuan‐Tseh , Cheng Hwa‐Sheng 
Published: June 2015

AbstractRadioactive equilibria in the hot spring sediment, Hokutolite, were studied, There were carried out the determination of the activity ratio of U‐series to Th‐series, and the accurate determination of the contents of the U‐series and Th‐series by absolute counting of β‐rays by using constant geometry method. The following nuclides were detected:Pb210 and Pb212 in the lead‐portion,Br210 and Bi212 in the bismuth‐portion,Ac28 in the hydroxide‐portion.it was shown that the radioactive series in Hokutolite starts from Ra and the activity ratio of U‐series to Th‐series is close to 4. The Ra‐content of the Hokutolite was estimated as 1.5× 10∼11 g/g.
Polyamide Thin‐Layer Chromatography, II. Application to Phenolic Constituents of Some Conifers
Authors: Lin Yau‐Tang , Wang Kung‐Tsung , Lin Yaw‐San 
Published: June 2015

AbstractThe phenolic part from the essential oil of Chamaecyparis taiwanensis Masamune et Suzuki, extractives of Chamaecyparis formosensis Matsum. and Taiwania cryptomerioides Hay. were studied by using polyamide thin‐layer chromatography. The presence of chamaecin, chamenol, thymol, carvacrol, m‐isopropylphenol and p‐cresol in the essential oil of Chamaecyparis taiwanensis Masamune et Suzuki was confirmed. Carvacrol, o‐isopropylphenol, m‐isopropylphenol, o‐cresol and p‐cresol were also detected from extractives of Chamaecyparis formosensis Matsum. The chromatogram of Taiwania cryptomerioides Hay. showed the presence of 12 spots. Among these, the spot with Rf value 0.37 was identified as Taiwanin B and that with Rf. value 0.80 as Taiwanin D.
Reaction of Disodiosuccinosuccinic Ester with Halogen Compounds. III. Reaction between Ethyl γ‐Bromocrotonate and Ethyl Disodiosuccinosuccinate
Authors: Chang Daniel Y. , Hee Cho 
Published: June 2015

AbstractThe reaction between ethyl γ‐bromocrotonate and disodiosuccinosuccinic ester has been investigted. The condensation product, on hydrolysis, gave a tetracarboxylic acid which, unlike other β‐ ketonic acids, was resistant to decarboxylation. This is discussed in connection with the decarboxylation of β‐ketonic acids in general.
Szilard‐Chalmers Reaction with Copper Chelates
Authors: Yeh Si Jung , Yin Moon‐Lung , Chou Jing Liang 
Published: June 2015

AbstractFour copper compounds, bis‐acetylacetone‐Cu(II) (A), bis‐dibenzoylmethane‐Cu(II) (B), acetylacetoneethylenediimine‐Cu(II) (C) and benzoylacetoneethylenediimimine‐Cu(II) (D) have been prepared and used as the targets in carrying out Szilard‐Chalmers process to investigate the feasibility for the enrichment of Cu‐64. Both solvent extraction method and re‐precipition method were used to separate the enriched Cu‐64. It was observed that no enrichment was brought about in the operations with compounds (A) and (B) under the condition studied. With compounds (C) and (D) however, enrichment factors of the order of 200–400 and 70–90, respectivery, were observed.
Photometric Studies of Bivalent Metal Chelates
Authors: Hwang Mei‐Wei 
Published: June 2015

AbstractThe phosphorescence Spectra of pure oxine and bivalent oxinates, namely, magnesium, calcium, manganese, cobalt, nickel, copper, zinc, cadmium and lead were studied at 77°K in rigid glass solution for the purpose of evaluating their phosphorescence efficiencies as related to the atomic number which permit qualitative deduction to be made in regard to the magnetic susceptibility and greater orbital interaction with atoms of higher atomic number (Z). Certain qualitative information on metal bonding, based on their comparative intensities of phosphorescence is presented.The solvent mixtures used for phosphorescence studies were EP (1:1), EPA (1:2:8) and EPAF (6:5:3:0.5). The absorption spectra of both the pure solvents and the mixtures mentioned above were studied at room temperature for the purpose of characterizing the type of transition. They all showed appreciable red shifts and were then interpreted in terms of π‐π triplet transition.
Infra‐Red Absorption Spectra of O‐Methylsilyl Derivatives of Some Alcohols and p‐Xylenol
Authors: Liu Sheng‐Lieh 
Published: June 2015

AbstractInfrared spectra of O‐methylsilylderivatives of n‐pentanol, isopentanol, geraniol, citronellol, and menthol, all previously unknown, are reported. Similiar derivatives of p‐xylenol have also been examined.
Extraction of Itaconic Acid from Aqueous Solution by Ion Exchange Method
Authors: Tsao June C. Y. , Huang Ting‐Chia 
Published: June 2015

AbstractThe extraction of itaconic acid from aqueous solution by the ion exchange method has been studied.With the anion exchange resin Amberlite IR‐45(OH) both ammonium hydroxide and sodium hydroxide can be used as effective elutriants and can concentrate the itaconic acid solution to three fold in a single run.Sodium hydroxide is comparatively a better elutriant than ammonium hydroxide.More concentrated elutriants (about 4N NH4OH and 3N NaOH) give sharper peaks and narrower ranges under the peaks of the elution curves and complete the elution to 96–99% at an earlier stage than the dilute ones.
A Rapid Method for the Determination of Invert Sugar in the Presence of Large Amounts of Sucrose
Authors: Hwang Mei‐Wei 
Published: June 2015

AbstractA new modified Fehling's solution with pH 10.7 has been prepared for the determination of reducing sugar by means of Eynon‐Lane method in the presence of large amounts of sucrose. The amount of reducing sugar ranging from 14.4% to 0.03% in the presence of 5–20 g of sucrose per 100 ml can be determined. The titre and concentration of reducing sugar relation may be expressed by the equation y=bx‐m.
Study of the Extractive Constituents from the Wood of Libocedrus Formosana, Florin. V. The Structures of Shonanic Acid and Isoshonanic Acid
Authors: Lin Yau‐Tang , Lo Tung‐Bin , Cheng Yu‐Shia 
Published: June 2015

AbstractThe structures of shonanic acid and isoshonanic acid were determined as 4, 4‐dimethylcyclohepta‐2, 5‐dienecarboxylic acid and 4, 4‐dimethylcyclohepta‐5, 7‐dienecarboxylic acid, respectively, by degradative studies and spectroscopic data.
Determination of Bromine and Iodine in Sodium Glutamate by Neutron Activation Analysis
Authors: Cheng Hwa‐Sheng , Ke Chiung‐Huei , Lin Ching‐Yü 
Published: June 2015

AbstractThe contents of Br and I in commercial sodium glutamate and cassava flour were determined by neutron activation analsis at the Tsing Hua Reactor. The conventional carbon tetrachloride extraction method was employed for the analysis of these elements. It was found that the content of Br varied widely between 0.003 and 0.1 ppm, while that of I varied between 0.06 and 0.7 ppm, in six samples of sodium glutamate. Two samples of cassava flour were found to contain 0.1 and 0.2 ppm of Br, and 0.02 and 0.04 ppm. of I, respectively. The higher contents of these elements in come glutamate samples as compared with the raw material was considered to be the contamination from chemicals used in the production processes.
Analysis of Taiwan Petroleum Coke
Authors: Chu Shu‐Kung , Chen Ming‐Tang 
Published: June 2015

AbstractPetroleum cokes, made from gas oil fraction of crude oil produced in different oil fields in Taiwan, were analyzed in ppm level for boron, vanadium, titanium, iron, calcium, aluminium, magnesium, chromium, cobalt, manganese, nickel, molybdenum, and copper.
The Essential Oil of Chamaecyparis Taiwanensis Masamune et Suzuki. V. The Identity of Chamaecin with 4‐Isopropylsalicylaldehyde
Authors: Lin Yau‐Tang , Wang Kung‐Tsung , Chang Luan‐Ho 
Published: June 2015

AbstractChamaecin was confirmed to be 4‐isopropylsalicylaldehyde by comparison with the synthetic compound, which was prepared by the oxidation of carvacrol methyl ether with manganese dioxide in 30% sulfuric acid followed by the hydrolysis with alumnium bromide incarbon disulfide solution.
Study of the Extractive Constituents from the Wood of Libocedrus Formosana, Florin. VI. Thin‐Layer Chromatography of Tropolones
Authors: Lin Yau‐Tang , Liu Kwang‐Ting 
Published: June 2015

AbstractThe technique of thin‐layer chromatography has been applied to the separation and identification of some tropolones on phosphoric acid impregnated, non‐bound cellulose powder. This method is simple, rapid and effective, Rj‐values of ten natural occurring tropolones are reported. The presence of ϵ‐thujaplicinol, ϵ‐ and γ‐thujaplicin in the wood extract of Libocedrus formosana is identified.
Intermolecular Association in Terms of Polarization at Optical Frequency. II. Chloroform‐Acetone and Diethyl Ether‐Chloroform
Authors: Ke Jenn , Lin Wei‐Chuwan 
Published: June 2015

AbstractInter‐molecular association in the chloroform‐acetone and diethyl ether‐chloroform systems was studied in terms of polarization at optical frequency, of which the theory had been developed in the previous paper.In the chloroform‐acetone system, the association ratio of acetone to chloroform was found to be 1:1 and 1:2 corresponding to the formation of the intermolecular associaton complexes AB and AB2 where A stands for acetone and B for chloroform.While in the case of the diethyl ether‐chloroform system, only complex of 1:1 association ratio was detected.The polarizability constants and collision radii of these association complexes were determined experimentally.
The Szilard‐Chalmers Enrichment of Iron‐59
Authors: Chang Chau‐Ting , Lin Chien‐Chang 
Published: June 2015

AbstractIron‐59 with high specific radioactivity was obtained by means of Szilard‐Chalmers process. Enrichment factor of as high as 750 was attained when potassium ferrocyanide was used as target material and was irradiated at a neutron flux of 1.8×1012 n/sec‐cm2 for 100 hours. However, a lower factor of 130 was obtained when potassium ferricyanide was used instead. Both precipitation and direct extraction with isopropyl ether in hydrochloric acid solution were employed as means of separation. The relation between irradiation time, enrichment factor and specific activity was also investigated. The radiative decomposition constants of potassium ferrocyanide and ferricyanide were estimated.
Sorption of Stontium‐90 by Soil
Authors: Cheng Hwa‐Sheng 
Published: June 2015

AbstractThe removal of Sr‐90 by various clay deposits at pH values ranging from 0 to 14 shows slightly less effective than radiocesium uptake. The radiostrontium uptake by Red and Yellow soil is greatly affected by the foreign cations (0.01 N). Yellow soil is particularly suited for the removal of Sr‐90.
Sorption of Radioeuropium by Soil
Authors: Cheng Hwa‐Sheng 
Published: June 2015

AbstractThe removal of radiouropium (Eu‐152, 4) is practically complete at the pH values greater than 4 by the seven clay deposits studied. The chemical properties of the radioeuropium rather than the nature of the sorbing matrices are the determining factor in its decontamination. The effect of competition toward radioeuropium uptake from solutions by, and extraction of sorbed radioeuropium from, Yellow and Red soil by various cations (0.01N) have been studied.
Proton Magnetic Resonance Spectrum of Thujic Acid
Authors: Lin Wei‐Chuwan 
Published: June 2015

AbstractProton magnetic resonance spectrum of thujic acid was studid at 60 MC. Ethylenic proton spectra appeared in the range of 2.35T‐4.89T These are of interest from the point of view of structure determination. The proton spin‐spin coupling constants were determined to be 10.0 cps for double‐bonded vicinal protons, and 6.8 cps for single‐bonded vicinal protons. Two barely resolved quartets suggest the spin‐spin coupling between H1 and H0 for which the value was found to be 1.2 cps.
Essential Oils. XIII. Formosan Spearmint Oils. 2. The Spearmint Oils from “Ryan‐Fong” Variety and Japanese Improved Variety
Authors: Yeh Ping‐Hsien 
Published: June 2015

AbstractTwo varieties of spearmint grasses were collected to determine the yields of the essntial oil as well as the chemical constituents of the oil.The annual production of the Japanese improved variety grass was about 10,000–18,000 kg/ha. and that of the essential oil was about 20 kg/ha. The oil is mainly composed of 53.4% (—)‐carvone and 27.5% (—)‐limonene.The annual production of the Ryan‐Fong variety grass was about 30,000 kg/ha. which in turn yielded about 80 kg/ha of the essential oil. The oil contains 5% (—)‐limonene, 60% pulegone, and 30% rotundifolone.The ultraviolet spectrum of rotundifolone semicarbazone in methanol showed maxima at 273–274 m μ., which was slightly different from the value reported by Indian investigator. The reason for it was inquired.
Kinetic Studies of the Oxidation of Iodine with Ceric Sulfate.
Authors: Pan Kuan , Chen Schoen‐Nan 
Published: June 2015

AbstractThe Oxidation of iodine by ceric sulfate in sulfuric acid solution has been found to be of second‐order with respect to iodine and first‐order with respect to Ce(IV), by spectrophotometric measurements. CeSO4+2 was assumed to be the active species of ceric sulfate. The over‐all rate constants were found to be k0=2.66x IC4 l2/M2Imin for the reaction rate, ‐d[I2]/dt=k0[C3 (IV)][I2]2 in 1.0 M H2SO4 and K″ = 1.12×108 I2/M2·min for the reaction rate, ‐d[I2]/dt=k′[CeSO42+] [I2]2.
Polarisability of Some Organic Liquids from Polarisation at Optical Frequency III Benzene, Acetic Acid and Ethyl Acetate
Authors: Lin Ching‐Erh , Lue Ping‐Chang , Lin Wei‐Chuwan 
Published: June 2015

AbstractRefractive indices of several binary solution systems including cyclohexane‐benzene, benzene‐acetic acid, benzene‐ethyl acetate, carbon tetrachloride‐acetic acid and carbon tetrachloride‐ethyl acetate were measured by means of inter‐ferometer. Polarisability constant and collision radius of benzene, acetic acid and ethyl acetate were determined in the light of the theory advanced in the previous paper(1,4).
Dissociation Constants and Chelate Stability Constants of Some Substituted 8‐Hydroxyquinolines
Authors: Chang Tiao‐Hsu , Lin Ju‐Te , Chou Tsan‐Inn , Yang Shei‐Kwei 
Published: June 2015

AbstractThe acid dissociation constants of substituted 8‐hydroxyquinolines and the stability constants of their chelates with Co(II), Ni(II), Cd(II), Zn(II) and Pb(II) have been determined. The Calvin‐Bjerrum potentiometric titration technique was used in studying the behavior of these substances.
3, 3‐Bis‐(trimethylsilyl)‐2, 2, 4, 4‐tetramethyl‐2, 4‐disilapentane
Authors: Liu Sheng‐Lieh 
Published: June 2015

Abstract3, 3‐Bis‐(trimethylsilyl)‐2, 2, 4, 4‐tetramethyl‐2, 4‐disilapentane was synthesized by the reaction of carbon [tetrachloride and trimethylchlorosilane in tetrahydrofuran with lithium metal. 3‐Tri‐methylsilyl‐2, 2, 4,‐4‐tetramethyl‐2,4‐disilapentane was also found as byproduct.
Polarographic Behavior of Germanium(II)‐Perchlorate in Perchloric Acid Solutions
Authors: Pan Kuan , Fu Yi‐Chang , Huang Teh‐Shoon 
Published: June 2015

AbstractGe(II)‐perchlorate was prepared in perchloric acid solution. Two polarographic waves were observed in HClO4 at various H3O+ ion concentrations at 25°C. The cathode wave with E1/2=—0.34 volt vs. S. C. E. is ascribed to the reduction, Ge+++2e=Ge. The value of ia/Cm2/3/1/6 is 3.3 at 25°C. The reaction rate for the oxidation of Ge(II) to Ge(IV) in perchloric acid solution was found to be of first‐order with respect to [Ge(II)] in the H3O+ ion concentration range of 6∼7 N.
The Content of Uranium in Quartz Occurring in Some Localities of Taitung
Authors: Cheng Hwa‐Sheng , Lin Ching‐Yü , Ke Chiung‐Huei 
Published: June 2015

AbstractRadioactive minerals other than Hokutolite and monazite are unknown up to present in Taiwan. The hard green copperiferrous quartz found in north Taitung and collected by two field survey teams, exhibited measurable activity, the origin of which was found to be uranium. Activation analysis revealed that the content of uranium in these samples ranged between 0.002 and 0.035%. It was also found that uranium was accompanied with copper, and that inclusion of iron in the sample decreased the uranium content. The result will be of value in the understanding of the cause of concentration of uranium in quartz and its physical and chemical state in these samples. The content of uranium in talc and monazite concentrate was also determined.
Osmotic and Activity Coefficients of Copper(II)‐Perchlorate from Freezing‐Point Measurements
Authors: Pan Kuan , Huang James Jan‐Tsyu 
Published: June 2015

AbstractOsmotic coefficients and activity coefficients of copper(II)‐perchlorate were calculated from freezing‐point depression in aqueous solutions of 1×10−2∼5×10−1 molal Cu(ClO4)2 by the warming curve method, using a thermistor as the temperature sensitive element.
Conductivities of Copper(II)‐Perchlorate and Chloride
Authors: Pan Kuan , Chang Chen‐Fee , Cheng Bao‐Ding 
Published: June 2015

AbstractThe limiting equivalent conductivities Λ° of aqueous Cu(ClO4)2 and CuCl2 were found to be 121.0 and 130.0 cm2 ohm−1 equiv−1, respectively, at 25°C. The limiting equivalent conductivity of Cu++ ion was calculated as λcu++=53.6 cm2 ohm−1 equiv−1, and the limiting transference number, T01, of Cu++ ion was calculated as 0.4430 for Cu(ClO4)2 and 0.4123 for CuCl2.
A Polarization Study of Molecular Addition Complexes of Aromatic Hydrocarbons with Polynitrobenzenes at Optical Frequency
Authors: Lin Jar‐Shyong , Lin Wei‐Chuwan 
Published: June 2015

AbstractThe polarizabilities of molecular addition complexes formed with polynitrobenzenes and aromatic hydrocarbons were determined experimentally at optical frequency. The molecular polarizabilities of the related components were also determined.The results obtained were found to be qualitatively consistent with one another.The polarizability of the complexes was discussed in terms of the resonance between the no‐bond structure and the charge‐transfer structure.
Effects of Electron Beam Irradiation on Polyvinyl Chloride
Authors: Yeh Si‐Jung , Chen Tsan‐Jan 
Published: June 2015

AbstractThin films of fractionated polyvinyl chloride were irradiated both in the air and in vacuum with electron beam of different dose rates generated by Van de Graaff generator. The dose rates used in this study ranged from 3.97×103 rads/sec. to 3.47×104 rads/sec. The temperature of irradiation was kept below 30°C to eliminate the heat effect due to electron beam irradiation. The molecular weights of the irradiated ploymer were estimated by measuring the viscosity of irradiated polyvinyl solution chloride in cyclohexanone. The estimation was carried out immediately after irradiatino to avoid the post irradiation effect.When the polyvinyl chloride was irradiated in the air with the dose rate below 2.27× 104 rads/sec, the molecular weights of irradiated polyvinyl chloride decreased gradually. Beyond the total dose of 3.4×106 rads, however, the molecular weights of irradiated polyvinyl chloride began to increase. Nevertheless, when the dose rate higher than 2.87×104 rads/sec was applied, the molecular weights of the irradiated polyvinyl chloride increased as soon as the polymer was subjected to irradiation. In all case studied the molecular weights of polyvinyl chloride increased rapidly beyond the total dosage of 5×106 rads, and the polymer became insoluble when the total dosage reached 7×108 rads. More clear cut trend was observed when the polyvinyl chloride was irradiated in vacuum.
Isolation and Amino Acid Composition of Human Milk Casein and its Components
Authors: Chen Joseph S. , Ting Wen‐Kuo 
Published: June 2015

AbstractA modified procedure is described for isolation of whole human milk casein.Human milk casein has been separated into three fractions. The gamma fraction was found to be more abundant than the beta‐fraction, while the alpha‐fraction occurred only in tracer amount.The amino acid composition, electrophoretic mobilities, and the side chain groups of the human milk casein and its fractions have been determined.
Polyamide Layer Chromatography. Identification of Amino Acids in Angelica acutiloba Kitagawa via DNP Derivative
Authors: Lin Yau‐Tang , Wang Kung‐Tsung , Wang Iris S. Y. 
Published: June 2015

AbstractEighteen amino acids; proline, alanine, valine, leucine, isoleucine, hydroxyproline, phenylalanine, ornithine, glycine, serine, aspartic acid, glutamic acid, threonine, asparagine, lysine, tyrosine, tryptophan, and arginine were identified by polyamide layer chromatography via DNP (dinitrophenly) derivatives in Angelica acutiloba Kitagawa (Tang‐Kwei)
Chemical Studies of Formosan Cobra (Naja naja atra) Venom. Part I. Chromatographic Separation of Crude Venom on CM‐Sepadex and Preliminary Characterization of its Components
Authors: Lo Tung‐Bin , Chen Yee‐Hsiung , Lee Chen‐Yuan 
Published: June 2015

AbstractThe crude venom of Formosan cobra (Naja naja atra) was separated into 12 fractions by CM‐Sephadex (C‐50) chromatography with ammonium acetate buffer by two‐stage gradient elution.Fr. I was proved to be a mixture of nucleotides and nucleosides. The toxicity was found in Fr. VIII (neurotoxic), X (cardiotoxic), XI (cardiotoxic), and XII (cardiotoxic). Glycerophosphatase, alkaline phosphomonoesterase, and 5′‐nucleotidase were found in Fr. III, V and IX, respectively. Phosphodiesterase was distributed in Frs. VI and VII, while lecithinase‐A (phospholipase‐A) was found in Frs. IV and V.Frs. VIII, IX and XII seem to be homogenous by the n‐terminal analysis and the paper electrophoresis.
Polarographic Behavior of Bivalent Germanium in Alkaline Solution
Authors: Pan Kuan , Huang Jan‐Tsyu 
Published: June 2015

AbstractBivalent germanium was polarographically studied in sodium hydroxide solution at various concentrations. A well‐defined reduction wave with half‐wave potential varying from −0.90 to −0.98 volt vs. S.C.E. was observed for 1×10−4 M Ge(II) in concentration range of 0.2 to 2.0 F with respect to NaOH, and from −0.70 to −0.88 volt vs. S.C.E. in the pH range 9.0–12.1 at 25°. The value of id/C is 5.43 μα/mM and that of id/C mfor t1/8 is 5.21. Dependence of E1/2 upon pH is expressed by —E1/2 =0.18+0.058 pH. Experimental result suggests that the reaction proceeds in two‐steps involving an irreversible two‐electron reduction: Ge(OH)2+OH−→HGeO2−+H2O and HGeO2−+H2O+2e→Ge0+3OH−.