| Author (s): |
IONESCU, Lavinel G.
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| Title: |
ILIE G, MURGULESCU, A PROMINENT SCIENTIST AND EDUCATOR |
| Abstract: |
Ilie G. Murgulescu was born on January 27, 1902 in Cornu, County of Dolj, (Judetul Dolj), Oltenia, Romania and passed away in Bucharest on October 28, 1991.
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| Keywords: |
ILIE G, MURGULESCU, A PROMINENT SCIENTIST AND EDUCATOR .
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| Year: |
1993
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| Initial page: |
1
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| Final page: |
4
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.7_1993.pdf |
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| Author (s): |
IONESCU, Lavinel G.
|
| Title: |
THE BIRTH OF A JOURNAL |
| Abstract: |
It is with great pleasure and satisfaction that we bring to light the premier issue of THE SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY. This Journal was founded to provide an open international forum for the discussion and publication of theoretical and applied aspects dealing with chemistry and related interdisciplinary, multidisciplinary, and transdisciplinary areas of science and to fill a gap and lacuna in terms of scientific literature for Southern Brazil.
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| Keywords: |
BIRTH OF A JOURNAL.
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| Year: |
1993
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| Initial page: |
1
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| Final page: |
1
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.6_1993.pdf |
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| Author (s): |
Paulo Irajara Borba Carneiro; Roberto Rittner; Rogerio Custodio
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| Title: |
CARBON-13 NMR OF SOME S-METHYLTHIOLESTERS |
| Abstract: |
H-1 and C-13 NMR chemical shifts for some alkyl-S-methyl-thiolesters (RCOSMe) are reported. The alfa-methylene and carbonyl carbons show lower field shifts when compared to analogous carboxylic acid derivatives. This behavior was explained by using charge densities and separation energies calculated by the AMl MO-SCF semiempirical method.
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| Keywords: |
C-13 NMR, Chemical Shifts, Alkyl-S-methylthiolesters.
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| Year: |
1993
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| Initial page: |
5
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| Final page: |
9
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.11_1993.pdf |
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| Author (s): |
Tanus Jorge Nagem; Tania Toledo de Oliveira e Albuquerque; Luiz Carlos Guedes de Miranda; Marilda Conceição da Silva
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| Title: |
FLAVONOIDS IN CULTIVARS OF SOYBEAN: ANTIOXIDANT ACTION |
| Abstract: |
The purpose of this investigation was the identification, quantification, and determination of the antioxidant activity of flavonoids of soybean. Examination of nine cultivars was carried out. All of them had the same stage of maturity and were grown on the same soil. The results showed the presence of genistein, genistein, daidzein, daidzin, naringenin, kaempferol, formonometin, and biochanin A in all cultivars. In terms of antioxidant activity, the best results were obtained with genistein and genistin.
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| Keywords: |
Flavonoids, soybean, antioxidant action.
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| Year: |
1993
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| Initial page: |
11
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| Final page: |
22
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.16_1993.pdf |
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| Author (s): |
Jose Claudio Del Pino; Anildo Bristoti; Mario Pinheiro
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| Title: |
ELASTOMERIC COMPOSITIONS FOR THE PRODUCTION OF RUBBER ARTIFACTS USED IN SHOE MANUFACTURING AND CIVIL CONSTRUCTION |
| Abstract: |
Sugar cane bagasse is a common byproduct of the aZaohoZ and sugar industries. In the present work, we describe the preparation of elastomeric agglomerates containing SBR [poly(styrene-butadiene)] and bagasse or kaolin as inert filler. The experimental results and a series of laboratory and field tests show that the sugar cane bagasse agglomerate can be very appropriate and useful for practical applications, especially in the manufacture of shoe soles.
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| Keywords: |
Sugar Cane Bagasse, Elastomeric Composites, Agglomerates.
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| Year: |
1993
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| Initial page: |
23
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| Final page: |
28
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.28_1993.pdf |
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| Author (s): |
José Schifino
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| Title: |
AN INTERESTING CASE OF CONSECUTIVE REACTIONS |
| Abstract: |
This paper deals with a special case of two consecutive first-order reactions where the two rate constants are equal. This peculiar situation, that may not exist in real systems, has an interesting mathematical solution.
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| Keywords: |
consecutive first-order reactions .
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| Year: |
1993
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| Initial page: |
29
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| Final page: |
32
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.34_1993.pdf |
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| Author (s): |
Michael Laing
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| Title: |
THE KNIGHT S MOVE IN THE PERIODIC TABLE: a regularity amongst the d10 metals on the lower right-hand side |
| Abstract: |
This article describes a pattern of reactivity and properties of the d10 metals in the bottom right-hand side of the periodic table. Pairs of metals such as Zn-Sn, Cu-In, Ag-Tl, Cd-Pb, and Sn-Po, all related by the knight s move, are discussed, taking into consideration their properties, electronic configuration, and metallic state.
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| Keywords: |
electronic configuration.
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| Year: |
1993
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| Initial page: |
33
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| Final page: |
59
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.38_1993.pdf |
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| Author (s): |
Joseph A. Schufle
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| Title: |
TORNBERN BERGMAN S THUNDERSTORM LECTURES |
| Abstract: |
This article describes and analyzes the importance of T.ornbern Bergman s inaugural lecture given to the Swedish Royal Society in 1764 on preventing the destructive effects of thunderstorms.
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| Keywords: |
thunderstorms.
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| Year: |
1993
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| Initial page: |
49
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| Final page: |
59
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.54_1993.pdf |
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| Author (s): |
Érico M. M. Flores; Ayrton F. Martins
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| Title: |
USE OF POLLUTION BIOINDICATORS FOR FLUORIDE IN THE VICINITY OF COAL THERMOELECTRIC POWER PLANTS |
| Abstract: |
Determination of fluoride in environmental samples of pasture and honey leads to the conclusion that these materials may be used as pollution bioindicators in areas of industrial activity. Concentrations of fluoride determined in recent times are above reference values. This observation is reinforced by the occurrence of various oases of bone deformation (fluorosis) and dental problems of ruminants in the area. A synergetic effect of fluoride on the abrasion of coal ash deposited on graze lands is also observed.
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| Keywords: |
Fluoride, Pollution Bioindicators, Pasture, Honey..
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| Year: |
1993
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| Initial page: |
61
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| Final page: |
74
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.65_1993.pdf |
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| Author (s): |
Lavinel G. Ionescu, Elizabeth Fatima de Souza
|
| Title: |
MICELLAR CATALYZED HYDROLYSIS OF A PHOSPHATE ESTER IN AQUEOUS SOLUTIONS CONTAINING DIMETHYL SULFOXIDE |
| Abstract: |
The hydrolysis of p-nitrophenyldiphenyl phosphate lil:ls studied in aqueous solutions containing micelles of diethylheptadeaylimidazolinium ethyl sulfate (DEHIES), sodium hydroxide .and various aonaentrations of dimethyl sulfoxide (DMSO). Pseudo-first order (kψ) and second-order rate constants (k2) were determined at l5º, 25º, and 35 ºC and activation parameters such as Ea,ΔG≠, ΔH≠ and ΔS≠ were also measured. The rate profiles obtained for solutions containing 10-50% DMSO by volume exhibited clear maxima that shifted to higher concentrations of DEHIES as a function of DMSO added. For solutions containing 60-80% DMSO, there was no maximum in the rate profile, and inhibition of the reaction took place. Solutions containing 90% by volume of DMSO exhibited much higher reaction rates and considerably more catalysis. The experimental results are explained in terms of the Hughes-Ingold Theory, specific solvent effects, polarity, and internal pressure of the reaction medium. The interpretation and discussion of the results takes into consideration the formation of the stoichiometric hydrate DMSO.2H2O and the inhibitory effect of dimethyl sulfoxide on the formation of micelles of DEHIES.
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| Keywords: |
Micellar Catalysis, Dimethyl Sulfoxide, Internal Pressure, Solvente Effects, Mixed Solvent Systems, Phosphate Esters .
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| Year: |
1993
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| Initial page: |
75
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| Final page: |
95
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.79_1993.pdf |
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| Author (s): |
Minodora Leca; Ovidiu Segarceanu
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| Title: |
INFLUENCE OF FILM THICKNESS, TEMPERATURE AND INORGANIC FILLERS ON THE VOLUME ELECTRIC RESISTIVITY OF HEAT-CURING EPOXY VARNISH |
| Abstract: |
The dependence of the volume electric resistivity of heat-during epoxy varnish on the film thickness, temperature, and nature of inorganic fillers for films obtained by spraying on steel supports cured for 30 minutes at l60 °C was determined. Film thicknesses ranged between 5 and 56 µm, temperature between 24 °C and l40 °C, and the fillers were rutile type titanium micronizes mica, colloidal aluminium oxide, and aluminium silicate. The experimental data, treated statistically by the Linear regression method, shows a linear dependence of the volume electric resistivity on the film thickness and a hyperbolic one on temperature. The highest volume electric resistivity was obtained for films containing titanium dioxide and the lowest one for those with aluminum silicate. The volume electric resistivity depends on film thickness for films deposited from the solution and can not be considered a material constant.
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| Keywords: |
Insulator, Volume Electric Resistivity, Epoxy Resin, Varnish, Heat-Curing Resin, Inorganic Fillers for Insulators.
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| Year: |
1993
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| Initial page: |
97
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| Final page: |
105
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v1.n1.1993.100_1993.pdf |
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