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  • *Mars  (1)
  • Animals  (1)
  • Fish community structure  (1)
  • 1
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    Mars: a new core-crystallization regime (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2007-06-02
    Beschreibung: The evolution of the martian core is widely assumed to mirror the characteristics observed for Earth's core. Data from experiments performed on iron-sulfur and iron-nickel-sulfur systems at pressures corresponding to the center of Mars indicate that its core is presently completely liquid and that it will not form an outwardly crystallizing iron-rich inner core, as does Earth. Instead, planetary cooling will lead to core crystallization following either a "snowing-core" model, whereby iron-rich solids nucleate in the outer portions of the core and sink toward the center, or a "sulfide inner-core" model, where an iron-sulfide phase crystallizes to form a solid inner core.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stewart, Andrew J -- Schmidt, Max W -- van Westrenen, Wim -- Liebske, Christian -- New York, N.Y. -- Science. 2007 Jun 1;316(5829):1323-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Mineralogy and Petrology, Eidgenossische Technische Hochschule Zurich, CH 8092 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17540900" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Crystallization ; *Evolution, Planetary ; Iron ; *Mars ; Pressure ; Sulfides ; Sulfur ; Temperature
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Overexpression of a transporter gene in a multidrug-resistant human lung cancer cell line (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-12-04
    Beschreibung: The doxorubicin-selected lung cancer cell line H69AR is resistant to many chemotherapeutic agents. However, like most tumor samples from individuals with this disease, it does not overexpress P-glycoprotein, a transmembrane transport protein that is dependent on adenosine triphosphate (ATP) and is associated with multidrug resistance. Complementary DNA (cDNA) clones corresponding to messenger RNAs (mRNAs) overexpressed in H69AR cells were isolated. One cDNA hybridized to an mRNA of 7.8 to 8.2 kilobases that was 100- to 200-fold more expressed in H69AR cells relative to drug-sensitive parental H69 cells. Overexpression was associated with amplification of the cognate gene located on chromosome 16 at band p13.1. Reversion to drug sensitivity was associated with loss of gene amplification and a marked decrease in mRNA expression. The mRNA encodes a member of the ATP-binding cassette transmembrane transporter superfamily.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cole, S P -- Bhardwaj, G -- Gerlach, J H -- Mackie, J E -- Grant, C E -- Almquist, K C -- Stewart, A J -- Kurz, E U -- Duncan, A M -- Deeley, R G -- New York, N.Y. -- Science. 1992 Dec 4;258(5088):1650-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Research Laboratories, Queen's University, Kingston, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1360704" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Chromosome Banding ; Chromosomes, Human, Pair 16 ; Doxorubicin/*pharmacology ; Drug Resistance/*genetics ; Gene Amplification ; Humans ; Lung/physiology ; Lung Neoplasms ; Male ; Membrane Glycoproteins/*genetics ; Molecular Sequence Data ; Multigene Family ; P-Glycoprotein ; Phylogeny ; RNA, Messenger/genetics ; Sequence Homology, Amino Acid ; Testis/physiology ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 3
    Digitale Medien
    Digitale Medien
    Fish size and habitat depth relationships in headwater streams (1991)
    Springer
    Oecologia 87 (1991), S. 336-342 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Fish ; Fish community structure ; Habitat selection ; Headwater streams ; Predation risk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Surveys of 262 pools in 3 small streams in eastern Tennessee demonstrated a strong positive relationship between pool depth and the size of the largest fish within a pool (P〈0.001). Similarly, the largest colonizers of newly-created deep pools were larger than the colonizers of shallow pools. We explored the role of predation risk in contributing to the “bigger fish — deeper habitat” pattern, which has been noted by others, by conducting five manipulative field experiments in two streams. Three experiments used stoneroller minnows (Campostoma anomalum); one used creek chubs (Semotilus atromaculatus); and one used striped shiners (Notropis chrysocephalus). The stoneroller experiments showed that survival of fish approximately 100 mm in total length (TL) was much lower in shallow pools (10 cm deep) than in deep (40 cm maximum) pools (19% versus 80% survival over 12 d in one experiment) and added cover markedly increased stoneroller survival in shallow pools (from 49% to 96% in an 11-d experiment). The creek chub experiment showed that, as for stonerollers, pool depth markedly influenced survival: the chubs survived an average of 4.9 d in shallow pools and 〉10.8 d in deep pools. In the striped shiner experiment in shallow artificial streamside troughs, no individuals 75–100 mm TL survived as long as 13 d, where-as smaller (20–25 mm) fish had 100% survival over 13 d. The results of the experiments show that predation risk from wading/diving animals (e.g., herons and raccoons) is much higher for larger fishes in shallow water than for these fishes in deeper water or for smaller fish in shallow water. We discuss the role of predation risk from two sources (piscivorous fish, which are more effective in deeper habitats, and diving/wading predators, which are more effective in shallow habitats) in contributing to the bigger fish — deeper habitat pattern in streams.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00634588
    Standort Signatur Erwartet Verfügbarkeit
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