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  • Springer  (140)
  • Wiley-Blackwell  (33)
  • 2000-2004  (43)
  • 1990-1994  (71)
  • 1985-1989  (33)
  • 1975-1979  (26)
  • 1955-1959
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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the synthesis of β-keto esters derived from dipeptides: search for a low-epimerizing method (2000)
    Springer
    International journal of peptide research and therapeutics 7 (2000), S. 143-149 
    Details
    ISSN: 1573-3904
    Keywords: dipeptide analogues ; epimerization ; imidazolide-derived dipeptides ; keto esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary β-Keto esters derived from dipeptides are prepared by application of common methodologies employed for the synthesis of amino acid-derived β-keto esters; however, epimerization of the C-terminal residue occurred to different extents depending on the method. In imidazolide activated dipeptides, this epimerization is due to the CDI activation step and to the configurational instability of the intermediate imidazolides in different reaction media. Regarding yield and diastereomeric purity, the method of choice proved to be the reaction of dipeptide-derived imidazolide with the potassium salt of malonic half esters in the presence of MgCl2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443581
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on the synthesis of β-keto esters derived from dipeptides: search for a low-epimerizing method (2000)
    Springer
    International journal of peptide research and therapeutics 7 (2000), S. 143-149 
    Details
    ISSN: 1573-3904
    Keywords: dipeptide analogues ; epimerization ; imidazolide-derived dipeptides ; keto esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract β-Keto esters derived from dipeptides areprepared by application of common methodologiesemployed for the synthesis of amino acid-derivedβ-keto esters; however, epimerization of theC-terminal residue occurred to different extentsdepending on the method. In imidazolide activateddipeptides, this epimerization is due to the CDIactivation step and to the configurational instabilityof the intermediate imidazolides in different reactionmedia. Regarding yield and diastereomeric purity, themethod of choice proved to be the reaction ofdipeptide-derived imidazolide with the potassium saltof malonic half esters in the presence of MgCl2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008996908844
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  • 3
    Electronic Resource
    Electronic Resource
    Packing analysis of racket-like molecules: C6H5MX (M=metal, X=Cl, Br, I). Crystal structure determination of microcrystalline C6H5HgCl by XRD (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 595-600 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Relationships between molecular shape and its crystal packing are studied. The XRD crystal structure of macrocrystals and microcrystals of C6H5HgX, and their VDW packing analysis, suggest two isoenergetic packing models for racket-like molecules. One of them favoring the crystal growth, and the other more frequent forming microcrystalline aggregates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228771
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  • 4
    Electronic Resource
    Electronic Resource
    X-ray diffraction study of a CoMo sulfide obtained by the impregnated thiosalt decomposition method (1990)
    Springer
    Catalysis letters 7 (1990), S. 377-382 
    Details
    ISSN: 1572-879X
    Keywords: Bulk sulfide catalysts ; CoMo sulfides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract X-ray powder diffractometry was used to characterize the phases produced during the preparation of MoS2 catalysts promoted with Co, by the impregnated thiosalt method. After a crystallization process at 673 K and 1043 K the X-ray analysis seems to indicate the presence of a mixed CoMo sulfide, in addition to the MoS2 and Co9S8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764927
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamics of copper(II) dicarboxylate coordination in aqueous solution (1978)
    Springer
    Transition metal chemistry 3 (1978), S. 147-152 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The association of H+ and Cu2+ with malonate, maleate, succinate and phthalate ions has been investigated both potentiometrically and calorimetrically at 25° and I = 0.1 mol dm−3 (NaClO4). The structures of the complexes existing in aqueous solution are proposed on the basis of thermodynamic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01393532
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  • 6
    Electronic Resource
    Electronic Resource
    Symbiotic efficiency and infectivity of an autochthonous arbuscular mycorrhizal Glomus sp. from saline soils and Glomus deserticola under salinity (2000)
    Springer
    Mycorrhiza 10 (2000), S. 137-143 
    Details
    ISSN: 1432-1890
    Keywords: Keywords Arbuscular-mycorrhiza ; Infectivity ; Fungal isolate ; Salt stress ; Symbiotic efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The purpose of this study was to compare the effect of salinity on the symbiotic efficiencies and mycelial infectivity of two arbuscular mycorrhizal fungi (AMF), one isolated from saline soils (Glomus sp.) and the other (Glomus deserticola) from nonsaline soils (belonging to the Estación Experimental del Zaidín collection). Lettuce plants inoculated with either of these two fungi or maintained as uninoculated controls were grown in soil with three salt concentrations (0.25, 0.50 or 0.75 g NaCl kg–1 dry soil). Both AMF protected host plants against salinity. However, when the results of shoot dry weight and nutrient contents were expressed relative to the total length of mycorrhiza formed, it was found that both AMF differed in their symbiotic efficiencies. These differences were more evident at the two highest salt levels. Glomus sp.-colonized plants grew less and accumulated less N and P, whereas they formed a higher amount of mycorrhiza. The mechanism by which Glomus sp. protected plants from the detrimental effects of salt was based on the stimulation of root development, while the effects of G. deserticola were based on improved plant nutrition. The increase in salinity of soil decreased the hyphal growth and/or viability of Glomus sp. to a higher extent than those of G. deserticola since the mycelial network generated by G. deserticola was more infective than that of Glomus sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005720000075
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of substratum on the growth of Terpios, an encrusting sponge which kills corals (1987)
    Springer
    Coral reefs 5 (1987), S. 197-200 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The effects of substratum on the growth of Terpios was demonstrated using experimental and observational data at Guam, Mariana Islands. Terpios growth was measured on live coral, reef rock, and red calcareous algae in the field. In addition, Terpios was transplanted onto live coral, air-blasted (clean) coral, reef rock, and plexiglass plates, and subsequent growth measured. Terpios grows fastest on clean substrata followed by live coral, reef rock and red calcareous algae in decreasing order. Terpios is sometimes overgrown by Montipora, Porites and red calcareous algae. Since Terpios grows fastest when living coral tissue is removed, it is not likely that Terpios ingests coral tissue as previously suggested in the literature. Instead, Terpios is probably an efficient competitor of corals for space. Terpios overgrows most hard, stable reef substrata, and the growth rate on all sample substrata is substantial. Therefore Terpios has a great potential for covering a reef and may be one of the most important causes of disturbance on some coral reefs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300963
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  • 8
    Electronic Resource
    Electronic Resource
    Replacement of the promoter of the yeast plasma membrane ATPase gene by a galactose-dependent promoter and its physiological consequences (1987)
    Springer
    Current genetics 12 (1987), S. 105-110 
    Details
    ISSN: 1432-0983
    Keywords: Yest ; ATPase ; Galactose promoter ; Plasma membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In order to probe the physiological role of the yeast plasma membrane ATPase we have replaced the constitutive promoter of its gene by a galactose-dependent promoter. The resulting cells stop growing on glucose medium when the preformed ATPase is diluted to 20% of normal. There is a correlation between ATPase activity and both proton efflux from the cells and amino acid transport. A large proportion of growth-arrested cells appear enlarged and with several buds containing nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00434664
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  • 9
    Electronic Resource
    Electronic Resource
    Room temperature phosphorescence decay of metal chelates in micellar media (1988)
    Springer
    Microchimica acta 96 (1988), S. 269-282 
    Details
    ISSN: 1436-5073
    Keywords: room-temperature phosphorescence ; micelles ; aluminum ; ferron ; metal chelate-triplet state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The characteristics of the decay of the triplet state of metal chelates have been investigated in micellar media using room temperature phosphorescence (RTP) measurements of the Al-ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid) complex in cetyltrimethylammonium bromide (CTAB) micelles. Applications of such decay measurements include discrimination between metal complex species and evaluation of the stoichiometry of phosphorescent metal chelates. A thorough study of the effect of foreign ions (interferences) on the photochemical characteristics of RTP of the aluminum complex leads to a tentative classification of foreign cations. Results are compared with those for the Nb(V)-ferron phosphorescent complex in CTAB micelles and possible reaction mechanisms in the presence of micellar media are outlined in an effort to contribute to basic knowledge of micelle stabilized RTP of such inorganic ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01236111
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  • 10
    Electronic Resource
    Electronic Resource
    A solid-phase enzyme-linked assay for vitamin B12 (1989)
    Springer
    Microchimica acta 97 (1989), S. 65-73 
    Details
    ISSN: 1436-5073
    Keywords: vitamin B12 (cyanocobalamin) ; competitive binding assays ; enzyme-vitamin conjugates ; vitamin tablet analyses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new solid-phase enzyme-linked competitive binding assay for vitamin B12 (cyanocobalamin) is described. The assay is based on the competition between analyte B12 molecules and a glucose-6-phosphate dehydrogenase-vitamin B12 conjugate for a limited number of R-protein binding sites immobilized on sepharose particles. After appropriate incubation and washing steps, the enzyme activity bound to the solid-phase is inversely related to the concentration of B12 in the sample. Under optimized conditions, the method can detect B12 in the range of 3×10−10−1×10−8 M (using 100μl sample) with high selectivity over other biological molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197285
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