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  • 1
    Electronic Resource
    Electronic Resource
    Model for γγ→VV reactions near threshold (1991)
    Springer
    Few body systems 10 (1991), S. 159-170 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a Veneziano-like model for γγ→VV reactions near threshold involving exchanges of 0− trajectories int- andu-channels. The model is applied to γγ→ωω, ϕϕ, ρϕ, ρω and ωϕ processes. The model in its simplest form cannot account for the disparities in the cross sections for $$\gamma \gamma \to {\rm K}^{ * 0} \bar K^{*0}$$ andK *+ K *− and for γγ→ρ0ρ0 and ρ+ρ−. Further refinements of the model are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076292
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  • 2
    Electronic Resource
    Electronic Resource
    Mycotoxin formation in HY-320 wheat during granary storage at 15 and 19% moisture content (1990)
    Springer
    Mycopathologia 111 (1990), S. 181-189 
    Details
    ISSN: 1573-0832
    Keywords: mycotoxin ; ochratoxin ; Penicillium ; storage ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Eleven-kilogram parcels of HY-320 wheat, a cultivar of the new Canada Prairie Spring class, were kept at 15 and 19% initial moisture contents (IMC) in simulated storage in a Manitoba farm granary for 60 weeks to determine biotic and abiotic changes and mycotoxin production. Ochratoxin A reached a maximum of 0.24 ppm by week 20 in the 19% IMC wheat, but was absent in the 15% IMC wheat; no other mycotoxins were detected. Temperature, moisture content, O2 and CO2 levels, fat acidity values, seed germination, microfloral incidence and abundance, and the presence of other mycotoxins were monitored. Principal component analysis of all variables showed that the first principal components accounted for 32–41% of the system variability, and contained the ochratoxin A variable. Ochratoxin A was produced in moist grain that had decreased seed germination andAltermaria activity, and high fungal activity byPenicillium andAspergillus versicolor. Compared to other stored cereals previously studied, HY-320 wheat would be ranked in a low-risk category for mycotoxin formation, based on the ochratoxin A levels observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282802
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  • 3
    Electronic Resource
    Electronic Resource
    Ochratoxin a production in Bavarian cereal grains stored at 15 and 19% moisture content (1992)
    Springer
    Archives of environmental contamination and toxicology 23 (1992), S. 259-265 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Wheat, barley, and maize, each in 15-kg parcels at 15 and 19% initial moisture content (IMC), were kept in a Bavarian farm granary from June through November 1990. During this period, the grain at each IMC was analyzed for mycotoxins and monitored for grain temperature, carbon dioxide, seed germination, and microfloral incidence and abundance. Barley and maize stored for 20 weeks at 19% IMC contained ochratoxin A in amounts of 70 and 90 μg/kg, respectively. This mycotoxin was not detected in wheat stored at 19% IMC, nor in the grains stored at 15% IMC. Aflatoxin B1, sterigmatocystin, citrinin, and zearalenone were also assayed but not detected in grains stored at either IMC. Principal component analysis of the data indicated that ochratoxin A was produced in a damp niche in maize, when abundant metabolic activity and CO2 production by Penicillium glandicola and Aspergillus spp. were common.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212284
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  • 4
    Electronic Resource
    Electronic Resource
    Plantlets from somatic callus tissue of the woody legume Sesbania bispinosa (Jacq.) W. F. Wight (1991)
    Springer
    Plant cell reports 10 (1991), S. 247-250 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In vitro regeneration of plantlets and multiplication of Sesbania bispinosa (Jacq.) W.F. Wight plants from cultured callus tissue were demonstrated. Callus was established from both cotyledons and mature leaflets on Murashige and Skoog (MS) basal medium supplemented with BAP (0.5 mg/l) and 2,4-D (2 mg/l). Callus mediated shoot bud differentiation was studied under defined nutritional, hormonal and cultural conditions. Various concentrations of BAP or kinetin (Kn) with coconut milk (CM) in MS media induced different levels of shoot bud differentiation as well as multiplication. Multiple shoot bud differentiation occurred in most of the primary calli. The best medium for shoot bud differentiation from cotyledon derived callus, contained BAP (2 mg/l) and 15% CM (V/V). More efficient shoot bud organogenesis was recorded with BAP than Kn. Supplementation with CM in MS media accelerated shoot bud organogenesis in differentiating callus tissue. Rooting of differentiated shoots was achieved by a three step culture procedure involving (a) MS solid medium containing IBA (2 mg/l), (b) growth regulator free half strength MS medium with 1% charcoal, and (c) half strength MS liquid medium free of vitamins, growth regulators and charcoal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232568
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative limnology of Sambhar and Didwana lakes (Rajasthan, NW India) (1990)
    Springer
    Hydrobiologia 197 (1990), S. 245-256 
    Details
    ISSN: 1573-5117
    Keywords: saline lakes ; plankton ; primary productivity ; salt tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two alkaline saline inland lakes of Indian arid region were studied during 1984 and 1985, to assess functioning and interaction of various environmental and biological factors. Changes in physical and chemical variables, planktonic composition, chlorophyll content and phytoplankton primary productivity were examined. Salinity in both lakes fluctuated from almost fresh water (1.80‰), to hypersaline (300‰) and acted as the main controlling factor for almost all the biotic parameters. Maximum total alkalinities were 2162 mg l−1 and 2090 mg l−1, respectively in Sambhar and Didwana lakes. Dissolved oxygen ranged from completely anoxic conditions to maxima of 11.68 and 7.29 mg 1−1, respectively in Sambhar and Didwana lakes. Nutrient enrichment in the lakes was low. The phytoplankton species composition of Sambhar lake was reduced from an earlier reported 20 genera to only 11 (Nostoc, Microcystis, Spirulina, Aphanocapsa, Oscillatoria, Merismopedia, Nitzschia, Navicula, Synedra, Cosmarium and Closterium). Phytoplankton of Didwana was composed of only 9 genera including Anabaena and Nodularia. Sambhar lake, which once contained Artemia, is now totally devoid of them. On the other hand, Artemia was the most dominant zooplankter in Didwana lake at a salinity range of 15–288‰. Other zooplankters such as Moina, Cyclops and Brachionus flourished at lower salinity levels in Didwana lake. The seasonal quantitative and qualitative phyto- and zooplankton changes in relation to salinity are documented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026954
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  • 6
    Electronic Resource
    Electronic Resource
    Odor volatiles associated with mite-infested bin-stored wheat (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 713-724 
    Details
    ISSN: 1573-1561
    Keywords: Odor volatiles ; mites ; stored wheat ; Acarus siro ; Aeroglyphus robustus ; Lepidoglyphus destructor ; Acarina ; fungi ; ventilation ; tridecane ; citral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Tridecane, not previously reported in infested bin-stored grain, was associated with three mite species,Acarus siro (L.),Aeroglyphus robustus Banks, andLepidoglyphus destructor (Schrank), which were introduced into 15.2% moisture content wheat stored in two unheated experimental bins in Manitoba during 1986–1987. The mites and volatiles were sampled at weekly to bimonthly intervals throughout the year. The mites produced tridecane all year, although they overwintered at low numbers. Ventilation of one bin at an airflow rate of 1 liter/sec/m3 did not appear to affect mite survival and volatile production. Citral, an alarm pheromone for mites, was detected in mite-infested bin-stored grain. In laboratory studies all three mite species produced tridecane in wheat incubated at 20 °C and 70% relative humidity for two weeks.Acarus siro andAeroglyphus robustus reared at 25 °C and 90% relative humidity for four weeks on wheat and fungus-inoculated wheat also produced tridecane. Production of tridecane byA. robustus andL. destructor is being reported for the first time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016482
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  • 7
    Electronic Resource
    Electronic Resource
    X-rayK-absorption edge interpretation and energy determination (1990)
    Springer
    The European physical journal 81 (1990), S. 229-232 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low energy features of XANES (X-ray absorption near edge structure) in the X-rayK-absorption edge of transition metal systems have long been detected and attempts have been made to explain their origin. Only recently have some theoretical approaches based upon multiple scattering (MS) effects been applied in explaining the shape of theK-edge features. But the pre-edge shoulder, often labelled asB, has hitherto defied satisfactory explanation for its origin. The present work is an attempt in explaining the possible origin of this feature by using MS-theory to theK-edge XANES of some first row transition metal systems. The calculated energies using MS-formalism were found to be closer to the experimentally observed values for some systems of cobalt and copper. Using these results, theK-edge featuresA,B,C have been assigned to be originating from the resonance effects of scattering of the ejected photo-electron with the molecular potential set up by the central absorbing atom and its near neighbours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309353
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  • 8
    Electronic Resource
    Electronic Resource
    Facile technique of protein precipitation by application of electric current (1993)
    Springer
    Biotechnology techniques 7 (1993), S. 9-14 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Precipitation of proteins has been achieved following passage of direct electric current in various protein solutions. Application of as low as 3 V of electric current showed precipitation but the rate increased with increase in electric current. With 9 V there was more than 85% precipitation of protein within 15 min. Precipitation occurred at a wide range of pH and temperature. Electrophoretic analysis of precipitated proteins show that they are not denatured by application of electric current. Proteins thus precipitated can be easily recovered by centrifugation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151082
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  • 9
    Electronic Resource
    Electronic Resource
    Plasmid instability inLactobacillus plantarum strain caTC2 (1992)
    Springer
    Current microbiology 25 (1992), S. 219-223 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The stability of plasmids inLactobacillus plantarum was investigated by extended incubation of bacterial cells in the presence of different carbohydrates. Strain caTC2, carrying a plasmid-encoded chloramphenicol-resistant (Cmr) phenotype, was grown overnight (16–18 h) in MRS, MRS-L, and MRS-M broths containing 2% glucose, lactose, and maltose respectively at 30°C. The cultures were subsequently held at 30°C and room temperature (21±1°C) for an extended period (7 days). The total viable cell counts were assayed on MRS agar plates and tested for sensitivity to 30 μg chloramphenicol/ml by replica plating. The plasmid profiles of the chloramphenicol-sensitive strains showed that there was a loss of the 8.5-kb plasmid, but not the 10.6 or 6.5 kb plasmids. Concomitant loss of the chloramphenicol resistance phenotype and plasmid at high frequency, particularly by using MRS-L at 21°C method, suggests that this would be a simple and efficient method for curing selected plasmids in lactobacilli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570722
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