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Digitale Medien

A PORTABLE PROTON PRECESSION MAGNETOMETER (1966)

SARMA, D. GUPTA ; BISWAS, S. K.

Oxford, UK : Blackwell Publishing Ltd

Geophysical prospecting 14 (1966), S. 0

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ISSN: 1365-2478

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie , Physik

Notizen: The paper describes a transistorised, portable proton precession magnetometer constructed for surface geophysical prospecting. Constructional and circuit details are furnished. The readout of the instrument is digital. The accuracy of measurement is ± 1 part in 20,000. The maximum gradient of the total field under which a satisfactory measurement can be made is about 1 gamma/cm. The sensing head uses a single coil system with distilled water as the proton sample.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2478.1966.tb01762.x

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Digitale Medien

Metabolism of Maleic Hydrazide in Tea, Camellia sinensis (1967)

Biswas, P. K. ; Hall, Oscar ; Mayberry, B. D.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 20 (1967), S. 0

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ISSN: 1399-3054

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: The results obtained with tea plants treated with 14C-maleic hydrazide indicate that tea plants can metabolize maleic hydrazide to some extent. According to autoradiographic studies, two radioactive spots were found on X-ray films after exposure and development. Based on two-dimensional paper chromatography, possible ring cleavage, and infrared spectroscopic techniques, the possible metabolic products are lactic acid, succinic acid, maleimide and hydrazine.The biological activity of the metabolic products was tested by utilizing the Avena first internode test. Based on this investigation, it was noted that each radioactive area contained compound(s) that possess(es) some growth promoting properties. However, the results obtained with unknown number one (U1) indicate that it possesses greater growth-promoting properties than unknown two (U2). finally, the approximate concentrations of U1 and U2 were determined by comparison with known concentrations of IAA and in relation to the amount of growth produced during the 19½-hour period of incubation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1399-3054.1967.tb08369.x

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Effect of Chrysanthemum Plant Extract on Flower Initiation in Short-Day Plants (1966)

Biswas, P. K. ; Paul, K. B. ; Henderson, J. H. M.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 19 (1966), S. 0

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ISSN: 1399-3054

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: An extract was prepared from Chrysanthemum plants in flower. It was separated into eight different fractions putting emphasis on the sterol components of the extracts. Fractions 5 and 6 were found to contain active substance (s), which to some extent, brought about floral bud initiation in both Chrysanthemum and Xanthium.The active substance (s) present in the above two fractions might be a sterol (s), similar to those of sitosterol and stigmasterol or other related compounds.Gibberellic acid brought about stem elongation as usual, but was found ineffective in causing any tissue differentiation in both Chrysanthemum and Xanthium.Investigations are underway to separate and identify the different compounds present in fractions 5 and 6. The effects of these compounds on test plants, both individually and in combinations, might provide some valuable information as to the nature of the flowering hormone.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1399-3054.1966.tb07077.x

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