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  • BI8C6 and DB24C8  (1)
  • Breeding biology  (1)
  • 1995-1999  (2)
  • 1965-1969
Collection
Keywords
Publisher
Years
  • 1995-1999  (2)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Life cycle and population dynamics of Annina mesopotamica (Ahmed), (Isopoda, Flabellifera) in the Shatt Al-Arab Region, Basrah, Iraq (1996)
    Springer
    Hydrobiologia 330 (1996), S. 119-130 
    Details
    ISSN: 1573-5117
    Keywords: Breeding biology ; population dynamics ; Isopoda ; Annina ; ovoviviparous ; Shatt Al-Arab ; Iraq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A population of the intertidal, ovoviviparous, cirolanid isopod Annina mesopotamica was studied at the Al-Chibassy tributary of the Shatt Al-Arab river from 14 May 1973 to 29 April 1974, and at the Garmat-Ali river of the Shatt Al-Arab, Basrah, Iraq from 5 November 1984 to 30 June 1986. Population density varied between 128 to 5760 individuals m−2 with a mean of 1218 m−2. Highest numbers occurred between June and September. Breeding extended for most of the year except November/January to February/March, although ovigerous females were present throughout the year. The incubation period varied with season, and was ca. 2 weeks during the warmest period, and about a month at lower temperatures. Egg numbers varied between 4 to 66 with mean 24. Brood size was linearly proportional to female size. The size frequency distribution of the population was polymodal with a predominance of females over males. Four different types of growth curves were found: exponential, concave, convex, and intermediate between concave and convex. Growth rate varied between 0.63 and 2.19 mm month−1. Mortality was higher among summer cohorts. Life span varied between 5 and 11 months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020000
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular complexes of crown ethers, part 4: Complexes of crown ethers with picric acid (1996)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 25 (1996), S. 295-302 
    Details
    ISSN: 1573-1111
    Keywords: UV visible spectroscopy ; donor-acceptor charge transfer band ; crown ethers ; 15C5 ; 18C6 ; B15C5 ; BI8C6 and DB24C8 ; picric acid ; effect of salt on charge transfer band ; conformation of crown ether
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The intermolecular charge-transfer spectra of seven crown ethers (CE), viz, 15C5, 18C6, B15C5, B18C6, DC18C6, and DB24C8, with picric acid (PA) were studied in the UV-visible region in 1,2-dichloroethane (DCE) at 298.2 K. The complex formation equilibrium constant values,K c, suggest that many factors contribute toK c, among them crown ether conformation, size and the presence of an aromatic ring in the CE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01044999
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    Paper (German National Licenses)
    Fulltext
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