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  • Articles  (4,617)
  • Polymer and Materials Science  (4,317)
  • Ecology
  • crystal structure
  • Medicine  (4,617)
  • Natural Sciences in General  (296)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    The ecology of the visual pigments of snappers (Lutjanidae) on the Great Barrier Reef (1994)
    Springer
    Journal of comparative physiology 174 (1994), S. 461-467 
    Details
    ISSN: 1432-1351
    Keywords: Ecology ; Great Barrier Reef ; Lutjanidae ; Microspectrophotometry ; Visual pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The visual pigments in the retinal photoreceptors of 12 species of snappers of the genus Lutjanus (Teleostei; Perciformes; Lutjanidae) were measured by microspectrophotometry. All the species were caught on the Great Barrier Reef (Australia) but differ in the colour of the water in which they live. Some live in the clear blue water of the outer reef, some in the greener water of the middle and inshore reefs and some in the more heavily stained mangrove and estuarine water. All the species had double cones, each member of the pair containing a different visual pigment. Using Baker's and Smith's (1982) model to predict the spectral distribution of ambient light from chlorophyll and dissolved organic matter it was found that the absorption spectra of the visual pigments in the double cones were close to those that confer the maximum sensitivity in the different water types. Single cones contained a blue or violet-sensitive visual pigment. The visual pigments in the rods showed little variation, their wavelength of maximum absorption always being in the region 489–502 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191712
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation ofCryptococcus neoformans var.neoformans from bird droppings, fruits and vegetables in Mexico City (1995)
    Springer
    Mycopathologia 129 (1995), S. 25-28 
    Details
    ISSN: 1573-0832
    Keywords: C. neoformans ; Ecology ; Epidemiology ; Fungus isolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The presence ofCryptococcus neoformans in various natural sources, such as bird droppings, fruits and vegetables, was investigated. A total of 711 samples were analyzed;C. neoformans var.neoformans was isolated from seven out of 74 bird droppings (9.5%), with parrots as one of the most significant sources. Fruits were positive in 9.5% of the 169 samples studied, specially citrus fruits, particularly grapefruit, in which the highest frequency was found. From the 468 vegetable samples, only 20 were positive (4.2%). It is emphasized that five of the positive vegetables species are autochthonous to Mexico: avocado (Nectandra salicifolia), beet (Beta vulgaris var.quinopodiace), chayote (Sechium edule), stringbean (Cassia sp), and nopal (Opuntia ficus-indica).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01139333
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure of chicken liver basic fatty acid-binding protein at 2.7 Å resolution (1990)
    Springer
    Molecular and cellular biochemistry 98 (1990), S. 95-99 
    Details
    ISSN: 1573-4919
    Keywords: fatty acid-binding protein ; chicken liver ; crystal structure ; β-barrel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The three-dimensional structure of chicken liver basic fatty acid-binding protein has been determined at 2.7 Å resolution by X-ray crystallography. Phases were calculated using the multiple isomorphous replacement procedure and a preliminary model was built. This model, with an initial R-factor of 0.57, was then improved by a cycle of refinement by simulated annealing which brought the R factor down to 0.32. The protein is structured as a compact 10-stranded-β-barrel which encapsulates a residual electron density that can be interpreted as a fatty acid molecule. The NH2-terminus portion of the molecule contains two short α-helices. The structure of this liver protein appears very similar to that of the Escherichia coli derived rat intestinal FABP recently determined by X-ray diffraction methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231372
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  • 4
    Electronic Resource
    Electronic Resource
    Bionomics and health importance of fowl tickArgas (Persicargas) persicus (Oken, 1818) (Ixodoidea: Argasidae) (1980)
    Springer
    Parasitology research 63 (1980), S. 209-212 
    Details
    ISSN: 1432-1955
    Keywords: Argas persicus ; Bionomics ; Ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The fowl tickArgas (Persicargas) persicus occurs in warm areas of Slovakia, where its distribution is limited by the 650–700 mm annual average isohyet and the +8° C annual average isotherm. In Slovakia, larvae hatch from spring to autumn, and nymphal and adult moultings occur chiefly in July and August. Larvae feed for four days, nymphs and adults for less than one hour. The tick develops and reproduces during the warm season in the wild but throughout the year under favourable laboratory conditions in which the life cycle requires 17 months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931982
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  • 5
    Electronic Resource
    Electronic Resource
    Implants for site-specific drug delivery (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 211-212 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020309
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  • 6
    Electronic Resource
    Electronic Resource
    Letter to the Editor (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 213-213 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020310
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  • 7
    Electronic Resource
    Electronic Resource
    Masthead (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991) 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020401
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  • 8
    Electronic Resource
    Electronic Resource
    Erratum (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 215-215 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020311
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  • 9
    Electronic Resource
    Electronic Resource
    Announcement. 2nd international scientific workshop on biodegradable polymers and plastics (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 217-217 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020312
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  • 10
    Electronic Resource
    Electronic Resource
    A new bioactive bone cement: Its histological and mechanical characterization (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 219-229 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: We have developed a bioactive bone cement using CaO—SiO—2—P2O5—CaF2 glass powders and ammonium phosphate solution, and investigaed ist histological and mechanical characteristics in vivo. A bone defect was drilled in the proximal metaphysis of the rat tibia and filled with the bioactive bone cement in paste form or polymethylmethacrylate (PMMA) bone cement in the dough state. The cements were allowed to harden in situ. Histological examinationdemonstrated direct bonding between the new cement and bone by 4 weeks. The bioactive bone cement did not degrade up to 24 weeks postimplantation. The inflammatory reaction to the bioactive bone cement was less intense than the reaction induced by PMMA. Changes in the mechanical properties of the cement in vivo were studied by implanting hardened cylindrical specimens of both types of cement into the hindlimb muscles of ras of rats for 12 weeks. The compressive strength of the bioactive cement increased significantly after implantation, and reached 68 MPa in 1 week and 73 MPa in 4 weeks. These values were comparable to those of PMMA, and were maintained up to 12 weeks after implantation. This bioacive bone cement hadens in situ within a few minutes with negligible rise of temperature and can be easily handled as a paste for filling bone cavities of different shapes. In addition, this cement has good osteoconductive and bone bonding potential and fairly high mechanical strength. Therefore, this new cement could be used both as a bioactive bone cement and bone defect filler.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770020402
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