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  • 1
    Electronic Resource
    Electronic Resource
    Herbicide tank-mixing for post-emergence weed control in sugar beets (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 19 (1979), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Tank-mixtures of selective herbicides were evaluated for 2 years on field-grown sugarbeets under two weed flora situations: (a) mixed floras of broad-leaved and grass weeds and (b) weed floras of broadleaves grown beyond their stages of greatest sensitivity to herbicides. In these situations single herbicides usually fail to provide satisfactory post-emergence weed control in sugarbeets.Of several tank-mixtures, which could be devised for use in the first situation, ethofurnesate + Betanal AM 11, diclofop-methyl + Betanal AM 11 and diclofop-methyl + metamitron gave synergistic phytotoxicity to sugarbeet seedlings. Synergism in weed control, becoming apparent by an accelerated appearance of the herbicidal effects, was obtained with the mixture alloxydimeton + Betanal AM 11. This mixture was not phytotoxic and appears to be the most efficient for simultaneous control of broad-leaved and grass weeds.From trials in the second situation it became apparent that the activity of metamitron, which was reduced on older weeds, could be restored by mixing with a non-phytotoxic oil or a low dose of Betanal AM 11. These mixtures should be useful when growth of sugarbeets has been retarded by carried-over herbicides, drought, frost, etc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1979.tb01529.x
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  • 2
    Electronic Resource
    Electronic Resource
    COMPUTATION OF INTERVAL VELOCITIES FROM COMMON REFLECTION POINT MOVEOUT TIMES FOR n LAYERS WITH ARBITRARY DIPS AND CURVATURES IN THREE DIMENSIONS WHEN ASSUMING SMALL SHOT-GEOPHONE DISTANCES (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 24 (1976), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: It is well known that interval velocities can be determined from common-reflection-point moveout times. However, the mathematics becomes complicated in the general case of n homogeneous layers with curved interfaces dipping in three dimensions.In this paper the problem is solved by mathematical induction using the second power terms only of the Taylor series which represents the moveout time as a function of the coordinate differences between shot and geophone points. Moreover, the zero-offset reflection times of the nth interface in a certain area surrounding the point of interest have to be known. The n—I upper interfaces and interval velocities are known too on account of the mathematical induction method applied. Thus, the zero-offset reflection raypath of the nth interface can be supposed to be known down to the intersection with the (n—1)th interface.The method applied consists mainly in transforming the second power terms of the moveout time from one interface to the next one. This is accomplished by matrix algebra.Some special cases are discussed as e.g. uniform strike and small curvatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1976.tb00387.x
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  • 3
    Electronic Resource
    Electronic Resource
    COMBISWEEP—A CONTRIBUTION TO SWEEP TECHNIQUES (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 27 (1979), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Nonlinear sweeps have often successfully been employed in the 1960s. However, this area of sweep technology has been neglected since the introduction of digital recording techniques in the Vibroseis system. Now the advent of computerized recording instruments yields a new economical possibility of forming approximately nonlinear sweeps by combining several linear sweeps with or without time gaps to a “Combisweep”. The total duration of a Combisweep may be as long as the maximum available recording time, for example 32 s.Beside the attenuation of correlation noise, the new method has further merits, such as the weighting of predetermined frequency ranges, in order to effect a certain kind of optimum filtering on the emitter side, or in order to compensate to some degree for frequency dependent absorption.In all these applications the Combisweep is considered as one signal in the correlation process. But by correlating with the individual sweeps or a partial combination of them and by applying automatic switching at predetermined times within the gaps between the individual sweeps additional possibilities arise, such as obtaining in one run with a twenty-four channel recording unit twenty-four traces with small distances between vibrators and geophones for shallow reflections and another twenty-four traces with larger distances for deeper reflections. Various Combisweeps and their applications are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1979.tb00960.x
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  • 4
    Electronic Resource
    Electronic Resource
    Compartmentation of arginine biosynthesis in Saccharomyces cerevisiae (1977)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 2 (1977), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1977.tb00950.x
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  • 5
    Electronic Resource
    Electronic Resource
    LIPID-LIPID AND LIPID-PROTEIN INTERACTION IN MODEL SYSTEMS AND MEMBRANES (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 264 (1975), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1975.tb31479.x
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  • 6
    Electronic Resource
    Electronic Resource
    Acide abscissique lié et dormance embryonnaire chez Pyrus malus (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 46 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Bound abscisic acid and embryo dormancy in Pyrus malus.The first part of this work was devoted to the study of the behaviour of Pyrus malus L. cv. Golden Delicious embryos cultivated in vitro. At the beginning of the experiment, either the root (RM) or the distal part of the cotyledons (CM) was immersed in the medium. For embryos directly isolated from the fruits at harvest time, as well as for embryos submitted to a 3-month post-maturation treatment at 4°C, the dormancy was deeper in CM cultures than in RM. The use of gibberellins (GA4 or GA7) emphasized these differences.The second part of this work was devoted to the study of free and bound forms of ABA (cis and trans isomers) in embryos isolated from the fruits at harvest time and cultivated by the RM or CM procedure during 3 weeks. The biochemical data obtained indicated in both cases the existence of the following three processes: (A) Mobilization of the bound ABA with the consequent release of free ABA; this was particularly important in CM. (B) Metabolism of free ABA: the isomerization into trans-ABA only partly accounted for the decrease in the content of free ABA which was much greater in RM than in CM. (C) Transport of ABA towards the root, the result being an accumulation of free ABA in the root, much greater in CM than in RM; this would account for the deeper dormancy in CM than in RM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb06542.x
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  • 7
    Electronic Resource
    Electronic Resource
    The Recovery of Cytokinins during Extraction and Purification of Clubroot Tissue (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 35 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Losses of one naturally occurring cytokinin (zeatin) and one synthetic cytoknin (kinetin) were determined during purification of turnips (Brassica compestris) infected by Plasmodiophora brassicae (clubroot). A known amount of zeatin and 8-14C-kinetin was added after homogenization of plant material in ethanol or water. The commonly used practice to purify the aqueous residues of the homogenate by partitioning with petroleum ether was omitted because of emulsion formation. Losses due to emulsion formation and occlusion of 8-14C-kinetin into non-water soluble plant material could be prevented by extractionof clubroot tissue with water instead of ethanol. To minimize enzyme activity the aqueous homogenate was kept at 100°C for 5 min. High molecular weight compounds were removed by dialysis against water and the diffusible fraction was partitioned with n-butanol at pH 8.2.It was shown that a rapid evaporation of n-butanol under reduced pressure at high temperature caused less breakdown of 8-14C-kinetin than prologned treatment at a low temperature.To minimize breakdown to zeatin riboside the butanol fraction was purified further on cation cellulose-phosphate exchanger instead of on strong acid Dowex H+. 8-14C-kinetin was separated from zeatin by column chromatography on Sephadex LH20, and yielded 86% of the amount originally added to a plant homogenate.The zeatin containing fractions were further purified on thin layer chromatography (TLC) silicagel plates and injected into a high pressure liquid chromatograph. A yield of 60% could be estimated from the amount (15 μg) orignally added to 50 g clubroot tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03909.x
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