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  • Springer  (247)
  • 1985-1989  (106)
  • 1980-1984  (123)
  • 1965-1969  (18)
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  • 1
    Electronic Resource
    Electronic Resource
    Vanadyl phosphate dihydrate, a solid acid: the role of water in VOPO4·2H2O and its sodium derivatives Na x (VIV x VV 1−x O)PO4·(2−x)H2O (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 193-211 
    Details
    ISSN: 1573-1111
    Keywords: Vanadyl phosphate ; inclusion compounds ; topotactic reactions ; solid acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sodium-containing intercalates having as general formula Na x VOPOP4·(2−x)H2O (0.25≤x〈0.50) have been obtained and characterized. Orthorhombic phases, which essentially maintain the structure of the layered oxide hydrate VOPO4·2H2O result. Intercalated sodium ions act as ‘pillars’. The presence of H3O+ ions in the parent VOPO4·2H2O and also in some reduced phases, is detected. The understanding of the structural role of the water molecules is advanced and the topotactic dehydration/rehydration processes are studied. The formation of a new metastable VOPO4·H2O phase is established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663052
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  • 2
    Electronic Resource
    Electronic Resource
    Mono and dinuclear copper(II) complexes of 2,4,6-tris(2-pyridyl)-1, 3,5-triazine and halide or pseudohalide ions: Synthesis and spectral studies (1986)
    Springer
    Transition metal chemistry 11 (1986), S. 485-488 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary By inhibiting the copper(II) assisted TPT (TPT = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) hydrolysis, monomeric and dimeric copper(II) complexes having as general formulae Cu(TPT)X, · nH2O (X = Cl, Br, NCS, NCO or N3) and [Cu(TPT)X]2(PF6)2 · nH2O (X = Cl, Br, NCS or N3) have been synthesized and characterized by i.r., electronic and e.p.r. spectra, x-ray powder diffraction and analytical data. Spectroscopic results indicate five-coordinate geometry around the copper(II) ion, intermediate between trigonal-bipyramid and square-pyramid structures. The half-field absorption in the ΔMS = 2 region of powdered X-band e.p.r. spectra has been observed for the dimeric species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386884
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and spectral studies ofN-2-pyridinylcarbonyl-2-pyridinecarxoximidate copper(II) complexes (1987)
    Springer
    Transition metal chemistry 12 (1987), S. 306-310 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Dimeric and polymeric copper(II) complexes containing BPCA (N-2-pyridinylcarbonyl-2-pyridinecarboximidate), having general formulae Cu(BPCA)X·nH2O (X=Cl, Br, NCS, NCO, N3, or CN) and Cu2(BPCA)2-X·nH2O [X=oxalate anion (OX), chloranilate anion (CA) or the dianion of 2,5-dihydroxy-1,4-benzoquinone (DHBQ)] have been synthesized by the copper(II)-assisted hydrolysis of 2, 4, 6-tris(2-pyridyl)-1, 3, 5-triazine. Spectroscopic results indicate five-coordinate, approximately square-pyramidal, geometry around the copper(II) ion. Half-field absorption in the ΔM s=±2 region of the X-band e.p.r. powder spectra has been observed for the dimeric species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024019
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  • 4
    Electronic Resource
    Electronic Resource
    Design of ordered bimetallic complexes, Part 2:Trans-1,2-cyclohexanediaminetetraacetate bimetallates (1987)
    Springer
    Transition metal chemistry 12 (1987), S. 62-68 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Knowledge of the kinetic and thermodynamic behaviour of aqueous solutions containing two divalent cations andtrans-1,2-cyclohexanediaminetetraacetate has been used to design synthetic pathways to ordered bimetallic complexes
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01023135
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  • 5
    Electronic Resource
    Electronic Resource
    Resource partitioning by reef corals as determined from stable isotope composition (1989)
    Springer
    Marine biology 100 (1989), S. 185-193 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The pattern of resource partitioning vs depth by corals collected in February 1983 from Jamaica and the Red Sea was determined from their stable carbon isotope composition. Observations were made on isolated zooxanthellae and corresponding algae-free animal tissue from eight species at four depths over a 50 m bathymetric range. Zooxanthellae δ13C was high in shallow water and became lower as depth increased. This trend correlated significantly with the anual integrated photosynthetic rate. The trend is interpreted according to a “depletion-diffusion” hypothesis; in shallow water, at high rates of photosynthesis, metabolic CO2 is nearly depleted and the supply of CO2 from seawater bicarbonate is limited by diffusion. Since most of the available CO2 is fixed, isotope fractionation is minimal. In deeper water, at lower rates of photosynthesis, metabolic CO2 is ample, and isotope fractionation is greater. Animal tissue δ13C was slightly lower than corresponding zooxanthellae values in shallow water. As depth increased the difference between zooxanthellae and animal tissue δ13C increased and the latter approached the δ13C of oceanic particulate organic carbon. These data suggest that carbon is translocated at all depths and that deep-water corals draw significantly on allocthonous sources of carbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391957
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of particulate peat on the behavior and physiology of the Jamaican reef-building coral Montastrea annularis (1982)
    Springer
    Marine biology 68 (1982), S. 229-233 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Corals in an in situ respirometer exposed to suspended peat during the day greatly decreased net oxygen production, probably due to a reduction of intensity and spectral quality of light reaching the symbiotic zooxanthellae. Net production returned to pre-exposure levels after the chambers were cleared; the corals showed no behavioral effects. In contrast, after exposure during the night, corals displayed clearing behavior (such as extreme distension of the coenosarc and trapping of peat particles in thick clumps of mucus) and an increase in respiration rate comparable to the decrease in net production observed during the daytime exposure. The following morning, net production values were significantly lower than pre-exposure production values although ambient light intensity was slightly higher. This decrease in production as well as a 22% reduction of chlorophyll content in the coral tissue indicated loss of zooxanthellae from the stressed corals. Long-term exposure to such a stress could reduce coral growth rates and substantially alter coral reef communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409589
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of carbon dioxide concentration on coral photosynthesis (1983)
    Springer
    Marine biology 75 (1983), S. 113-116 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of inorganic carbon concentrations on photosynthetic oxygen evolution of isolated zooxanthellae and coral tips from the hermatypic coral Seriatopora hystrix were measured in the laboratory using an oxygen electrode. Whole coral colonies of Stylophora pistillata were examined in situ, using a bioassay respirometer. Inorganic carbon concentrations above 2.3 mM, the ambient concentration of reef water, generally did not stimulate photosynthesis. These results indicate that inorganic carbon is not limiting to coral photosynthesis and that respiratory carbon dioxide production by the coral host probably has little effect on the photosynthetic rates of its symbiotic zooxanthellae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405992
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  • 8
    Electronic Resource
    Electronic Resource
    A comparison of the metabolism of bicarbonate 14C and acetate 1-14C and the variability of species lipid compositions in reef corals (1983)
    Springer
    Marine biology 75 (1983), S. 121-130 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Branching heads of symbiotic corals were pulse labeled with either 14C-acetate or 14C-bicarbonate for 1.33 h and the distribution and loss of label was then followed for 16d. The patterns of incorporation and washout were similar for both tracers. Non-solvent-extractable radioactivity (1/3 of the total) was divided into a CaCO3 and an organic fraction, both of which exhibited small if any decrease in radioactivity over 16d. In contrast, total solvent extractable (lipid) radioactivity (2/3 of the total) decreased during the washout period with the first half-life for bicarbonate at 2 d, the second at 4 d and the third could not be measured because of the persistence of a constant amount of radioactivity (18% of Day 1 value) from Day 8 to 16. Of the total retained activity, the zooxanthellae fraction contained between 8–18% from Day 1 to 5. The percentage of total animal (host) radioactivity in lipids rose from 35–40% at 0 time after tracer exposure to 70–90% at 60 min. The majority of 14C fixed into lipids was recovered in the fatty acyl moieties and not in the glycerol moiety as had been previously reported a number of times. These studies suggest that photosynthetically fixed carbon is immediately synthesized into lipid, which is translocated to the host. Analyses of the fatty acid compositions of triacylglycerols (TG) and wax esters (WE) of 40 species of coral from a small patch reef were made. In aposymbiotic species the absence of zooxanthellae appeared to be correlated with higher levels of total lipid, lower percentages of saturated fatty acids and lower TG/WE ratios than in species with symbionts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405994
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  • 9
    Electronic Resource
    Electronic Resource
    Evolutionary conservation of DNA sequences expressed in sea urchin eggs and early embryos (1985)
    Springer
    Journal of molecular evolution 22 (1985), S. 99-107 
    Details
    ISSN: 1432-1432
    Keywords: mRNA ; egg RNA ; Nuclear RNA ; Sequence divergence ; Thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary DNA sequence divergence measurements indicate thatStrongylocentrotus franciscanus is more distinct fromS. purpuratus andS. drobachiensis than these two species are from each other, in agreement with paleontological and morphological evidence. The evolutionary divergence of several classes of expressed DNA sequences was compared with that of total single-copy DNA. BetweenS. franciscanus andS. purpuratus the divergence of cDNA made from gastrula cytoplasmic poly(A)+ RNA is about half that of total single-copy DNA. Similar results were obtained for cDNA made from unfertilized egg poly(A)+ RNA. In contrast, sequences expressed in gastrula nuclear RNA have diverged almost as much as total single-copy DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101688
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  • 10
    Electronic Resource
    Electronic Resource
    Polymorphism of human complement component C4 (1985)
    Springer
    Immunogenetics 21 (1985), S. 173-180 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An assessment has been made of the polymorphism of human complement component C4 by comparing derived amino acid sequences of cDNA and genomic DNA with limited amino acid sequences. In all, one complete and six partial sequences have been obtained from material from three individuals and include two C4A and two C4B alleles. Differences were found between the 4 alleles from 2 loci in only 15 of the 1722 amino acid residues, and 12 lie within one section of 230 residues, which in 1 allele also contains a 3-residue deletion. In three variable positions, an allelic difference in one C4 type was common to the other types. Three nucleotide differences were found in four introns. In spite of marked differences in their chemical reactivity, the many allelic forms appear to differ in less than 1% of their amino acid residue positions. This unusual pattern of polymorphism may be due to recent duplication of the C4 gene, or may have arisen by selection as a result of the biological role of C4, which interacts in the complement sequence with nine other proteins necessitating conservation of much of the surface structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364869
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