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  • Artikel  (300)
  • Ecology
  • crystal structure
  • Medizin  (300)
  • Allgemeine Naturwissenschaft  (296)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Ecology ; Great Barrier Reef ; Lutjanidae ; Microspectrophotometry ; Visual pigments
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00191712
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): C. neoformans ; Ecology ; Epidemiology ; Fungus isolation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01139333
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): fatty acid-binding protein ; chicken liver ; crystal structure ; β-barrel
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00231372
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Argas persicus ; Bionomics ; Ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00931982
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    [Perspective] How much biodiversity loss is too much? (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-07-15
    Beschreibung: How much of something do we need to keep people safe and well? This question is frequently asked by those working in risk management. Across diverse sectors from flood protection to health care, practitioners assess risk as the product of the impact of a given event and the probability of its occurrence. Although these estimates are often uncertain, policy-makers must ultimately make spending decisions aimed at averting these risks, because the costs of inaction to society can be substantial. Biodiversity loss is a similarly critical, yet uncertain, issue. On page 288 of this issue, Newbold et al. (1) quantify global biodiversity losses, providing much-needed information on the encroachment of proposed “safe limits.” Author: Tom H. Oliver
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    [Perspective] Butterfly communities under threat (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-07-15
    Beschreibung: Butterflies are better documented and monitored worldwide than any other nonpest taxon of insects (1). In the United Kingdom alone, volunteer recorders have sampled more than 750,000 km of repeat transects since 1976, equivalent to walking to the Moon and back counting butterflies (2). Such programs are revealing regional extinctions and population declines that began before 1900 (3, 4). In a recent study, Habel et al. report a similar story based on inventories of butterflies and burnet moths since 1840 in a protected area in Bavaria, Germany (5). The results reveal severe species losses: Scarce, specialized butterflies have largely disappeared, leaving ecosystems dominated by common generalist ones. Similar trends are seen across Europe (6) and beyond, with protected areas failing to conserve many species for which they were once famed. Author: Jeremy A. Thomas
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    [This Week in Science] This is no time to be a butterfly (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-07-15
    Beschreibung: Author: Julia Fahrenkamp-Uppenbrink
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    [Perspective] Can Apulia's olive trees be saved? (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-07-22
    Beschreibung: On 21 October 2013, the Italian phytosanitary service notified the European Commission (EC) that the plant pathogen Xylella fastidiosa had been detected in olive trees near Gallipoli, a tourist destination in Italy's southern region of Apulia (1). This xylem-limited bacterium is spread by insect vectors and causes disease in crops such as grapevines, citrus, coffee, and almond; various ornamentals; and trees such as oaks, elms, and sycamores. Because of the risks of X. fastidiosa being introduced, established, and spread throughout Europe, this species is a regulated quarantine pest. Yet, X. fastidiosa has been left unchecked and has marched northward, leaving destruction in its wake (see the photo) (2). The establishment of X. fastidiosa in Italy has been an agricultural, environmental, political, and cultural disaster. Author: Rodrigo P. P. Almeida
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    [This Week in Science] Olive quick decline syndrome (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-07-22
    Beschreibung: Author: Julia Fahrenkamp-Uppenbrink
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    [In Depth] An unhappy peace dividend (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publikationsdatum: 2016-04-08
    Beschreibung: Recent dives into Colombia's Cartagena Bay have revealed an unusually resilient coral reef thriving in the polluted waters. But the reef faces a threat: an end to Colombia's decades-long guerrilla war. The government is on the verge of inking a peace deal with its main adversary, the Revolutionary Armed Forces of Colombia, or FARC. Experts expect peace to lead to a development boom, threatening ecosystems all over the country with deforestation and runoff. A new shipping lane is planned for Cartagena Bay, and construction will mean dredging right through the reef. Researchers believe studying the reef's resiliency could help struggling corals around the world and are racing to collect samples before it's too late. Author: Lizzie Wade
    Schlagwort(e): Ecology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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