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  • Springer  (275)
  • National Academy of Sciences  (16)
  • Hindawi  (8)
  • 2015-2019  (268)
  • 2000-2004  (9)
  • 1985-1989  (22)
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  • 1
    Digitale Medien
    Digitale Medien
    Synthesis and mechanistic studies on the aquation of selenitoaquobis(diamine)cobalt(III) complexes (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 171-175 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The kinetics of the aquation of four selenitoaquobisdiamine)cobalt(III) complexes to their respective diaquabis-(diamine)complexes (diamine=ethylenediamine en, propylenediamine pn, dimethylethylenediamine me2en and trimethylenediamine tmd) have been carried out conductimetrically in the 25–45 °C range. All reactions exhibit simple first order kinetics, and the rates increase with increasing temperature. In aqueous solution, the complex species exist in equilibrium with their respective hydroxo species, but only the hydroxo species are involved in the aquation process. This result is also reflected in the linear Arrhenius plot. The rates are higher in a 10% alcoholic solution than in water, but then decrease with increase in the alcohol content. A Grunwald-Winstein plot of rates in methanol yields slopes of 0.18 ± 0.04, 0.27±0.03, 0.43±0.03 and 0.34±0.02 for the four amines respectively. A dissociation mechanism is proposed for the aquation of all these complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620665
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    In vitro andin vivo effect of chloropromazine, imipramine and lithium chloride on monoamine oxidase activity in rat brain mitochondria (1987)
    Springer
    Bioscience reports 7 (1987), S. 701-704 
    Details
    ISSN: 1573-4935
    Schlagwort(e): monoamine oxidase ; chloropromazine ; imipramine ; lithium chloride
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Chloropromazine (CPZ) and imipramine at a concentration of 1×10−3 M inhibit rat brain mitochondrial monoamine oxidase activity in vitro by 70 and 55% respectively, while lithium, even at a concentration of 0.05 M, inhibits the activity of this enzyme very negligibly (4%). In vivo, these drugs at a dose level of 56 mg CPZ, 76 mg Jimipramine and 76 mg lithium chloride/Kg body wt., did not cause any observable variation from normal in brain mitochondrial monoamine oxidase activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01116862
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    In vitro andin vivo effect of organophosphate pesticides on monoamine oxidase activity in rat brain (1987)
    Springer
    Bioscience reports 7 (1987), S. 801-803 
    Details
    ISSN: 1573-4935
    Schlagwort(e): lebaycid ; metacid ; metasystox ; monoamine oxidase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The effects of some organophosphate pesticides, e.g. lebaycid, metacid and metasystox on the monoamine oxidase (MAO) activity in rat brain mitochondria have been studied. These pesticides cause significant inhibition of MAO activityin vitro but have negligible effects on its activityin vivo.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01116753
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Control of Rhizoctonia disease of cauliflower by competitive inhibition of the pathogen using organic amendments in soil (1985)
    Springer
    Plant and soil 83 (1985), S. 357-362 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Antagonism ; Cauliflower ; Cellulose C∶N ratio ; Damping-off ; Rhizoctonia solani ; Rice stubbles ; Waterhyacinth
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Cauliflower damping-off caused byRhizoctonia solani was found to be appreciably reduced when population of the pathogen and other microflora in soil was manipulated by using powders of commercial cellulose, rice stubbles or waterhyacinth biomass in combination with NH4NO3 as soil amendments. Cellulose powder was most effective in reducing the disease incidence. Some of the amendments also promoted seedling growth. Total microbial population as well as those showing antagonism to the pathogen in culture increased relatively more in amended soil than in nonamended control. In general, when C∶N ratio in soil increased, fungal population decreased but actinomycetes and bacterial population increased.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02184447
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Effects of sulphur dioxide fumigation on soil system and growth behaviour ofVicia faba plants (1985)
    Springer
    Plant and soil 86 (1985), S. 69-78 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Growth behaviour ; Soil chemical properties ; Sulphur dioxide ; Vicia faba
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary To determine the possible changes in soil characteristics and plant growth resulting from SO2-exposure, field grownVicia faba plants were exposed to 0.5 ppm SO2 for 4 h daily from 40 to 100 days of their ages. The major effects of SO2 on soil system includes increases in contents of total sulphur, organic carbon and exchangeable Al; lowering of pH and decreases in contents of N, P and exchangeable K and Ca. Besides, SO2 interfered with nutrient uptake and plant growth leading to reductions in lengths of root and shoot, numbers of leaves, nodules and pods, phytomass accumulation and net primary productivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185026
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Asymmetric information about volatility: How does it affect implied volatility, option prices and market liquidity? (2000)
    Springer
    Review of derivatives research 3 (2000), S. 215-236 
    Details
    ISSN: 1573-7144
    Schlagwort(e): asymmetric information ; Black-Scholes ; implied volatility
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Wirtschaftswissenschaften
    Notizen: Abstract This paper develops a model of asymmetric information in which an investor has information regarding the future volatility of the price process of an asset and trades an option on the asset. The model relates the level and curvature of the smile in implied volatilities as well as mispricing by the Black-Scholes model to net options order flows (to the market maker). It is found that an increase in net options order flows (to the market maker) increases the level of implied volatilities and results in greater mispricing by the Black-Scholes model, besides impacting the curvature of the smile. The liquidity of the option market is found to be decreasing in the amount of uncertainty about future volatility that is consistent with existing evidence.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009674204212
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    A new mycotoxin from Aspergillus candidus Link isolated from rough rice (1987)
    Springer
    Mycopathologia 98 (1987), S. 21-26 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Aspergillus candidus Link ; new mycotoxin: toxicological studies on rats
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract A new mycotoxin (AcT1) was obtained from the mycelium of Aspergillus candidus Link isolated from rough rice stored under tropical conditions. AcT1 with the mol-formula C28H40O showed bright greenish blue fluorescence under uv (254 nm). The spectral and other characteristics indicated that the compound was a new one. The LD50 of the toxin on white rats was found to be 4.5 mg/Kg when injected intraperitoneally.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00431013
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Phase-function method for elasticα-α scattering (1989)
    Springer
    The European physical journal 332 (1989), S. 305-309 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 036.65.Nk ; 13.75.Cs ; 25.10.+s
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The phase-function method is adapted to deal with scattering on Coulomb plus nonlocal separable potentials. The Coulomb effect is included rigorously and a closed form expression is obtained for the scattering phase shiftδ l (k). Based on the expression forδ l (k) we present results forα-α elastic scattering phases which compare very well with more detailed calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01295460
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Solvent extraction separation of tantalum from niobium on macro scale using di(2-ethylhexyl) phosphoric acid as extractant (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 98 (1986), S. 247-253 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract A solvent extraction procedure for the separation of niobium and tantalum has been developed. The method consists of extracting tantalum from its aqueous mixture with niobium, with the help of di(2-ethylhexyl)phosphoric acid (HDEHP) in n-heptane. The aqueous feed consists of niobium and tantalum in an aqueous medium containing hydrochloric and oxalic acids. The concentrations of niobium and tantalum were raised to 1 mg/ml in the aqueous solution. The extraction efficiency of tantalum under these conditions was found to be ∼85%. Effects of chloride and oxalate ions as well as those of the concentration of HDEHP on the extraction efficiency were studied and discussed in detail.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02037087
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Unbekannt
    Reviving rare chicken breeds using genetically engineered sterility in surrogate host birds (2019)
    National Academy of Sciences
    Details
    Publikationsdatum: 2019-10-01
    Beschreibung: In macrolecithal species, cryopreservation of the oocyte and zygote is not possible due to the large size and quantity of lipid deposited within the egg. For birds, this signifies that cryopreserving and regenerating a species from frozen cellular material are currently technically unfeasible. Diploid primordial germ cells (PGCs) are a potential means to freeze down the entire genome and reconstitute an avian species from frozen material. Here, we examine the use of genetically engineered (GE) sterile female layer chicken as surrogate hosts for the transplantation of cryopreserved avian PGCs from rare heritage breeds of chicken. We first amplified PGC numbers in culture before cryopreservation and subsequent transplantation into host GE embryos. We found that all hatched offspring from the chimera GE hens were derived from the donor rare heritage breed broiler PGCs, and using cryopreserved semen, we were able to produce pure offspring. Measurement of the mutation rate of PGCs in culture revealed that 2.7 × 10−10 de novo single-nucleotide variants (SNVs) were generated per cell division, which is comparable with other stem cell lineages. We also found that endogenous avian leukosis virus (ALV) retroviral insertions were not mobilized during in vitro propagation. Taken together, these results show that mutation rates are no higher than normal stem cells, essential if we are to conserve avian breeds. Thus, GE sterile avian surrogate hosts provide a viable platform to conserve and regenerate avian species using cryopreserved PGCs.
    Print ISSN: 0027-8424
    Digitale ISSN: 1091-6490
    Thema: Biologie , Medizin , Allgemeine Naturwissenschaft
    Publiziert von National Academy of Sciences
    Standort Signatur Erwartet Verfügbarkeit
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