ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Beggiatoa alba  (2)
  • Mediterranean fruit fly  (2)
  • 2005-2009
  • 1985-1989  (4)
  • 1965-1969
  • 1
    Electronic Resource
    Electronic Resource
    Life history response of female Mediterranean fruit flies, Ceratitis capitata, to periods of host deprivation (1986)
    Springer
    Entomologia experimentalis et applicata 42 (1986), S. 159-167 
    Details
    ISSN: 1570-7458
    Keywords: Mediterranean fruit fly ; Ceratitis capitata ; host deprivation ; senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les femelles de C. capitata ont été privées d'hôtes suivant 4 modalités pendant 3 durées (33, 50 et 67% de leur vie) par période de 24 heures. Les modalités se répartissaient de la privation pendant 8 jours après l'éclosion jusqu'à 1 jour sur 3. La survie a été notée chaque jour et la ponte pour tous les jours où il y avait des hôtes. L'effect direct de l'absence d'hôte est d'empêcher la femelle de pondre. Ceci interrompt leur cycle de ponte et réduit leur activité reproductrice totale. Un effort reproductif réduit des femelles jeunes augmente la survie (jusqu'à 2 fois) et la ponte quotidienne (jusqu'à 8 fois) chez les femelles plus âgées. Ainsi, l'effet à long terme de la privation d'hôtes est d'ajourner la sénescence. Les implications de ces observations sur la sénescence de C. capitata sont discutées quant à: (1) la réduction des taux d'extinction des populations pendant les périodes de rareté d'hôtes; et: (2) les stratégies d'obtention de pontes dan les élevages de masse de C. capitata.
    Notes: Abstract Female medflies were subjected to four different patterns of host deprivation at each of three levels for a 24-day period. Treatments ranged from host absence 8 days post-eclosion to host absence 2 out of 3 days. Survival was recorded daily and egg production was recorded on the days in which hosts were present. The direct effect of host deprivation is to deny females the opportunity to oviposit. This disrupts their reproductive cycle and reduces their overall reproductive effort. Reduced reproductive effort at young ages increases survival (up to 2-fold) and daily reproduction (up to 8-fold) at older ages. Therefore, the long term effect of host deprivation is to postpone senescence. The implications of these findings regarding medfly sensescence are discussed in relation to: (i) reduction in population extinction rates during periods of host scarcity and (ii) egging strategies in medfly mass-rearing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343543
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of larval host on life history traits of the mediterranean fruit fly, Ceratitis capitata (1987)
    Springer
    Oecologia 73 (1987), S. 583-590 
    Details
    ISSN: 1432-1939
    Keywords: Mediterranean fruit fly ; Ceratitis capitata ; Insect demography ; Insect polyphagy ; Insect-host relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Demographic parameters for the Mediterranean fruit fly reared on each of twenty four different hosts from sixteen different plant families are reported. These include cohort parameters of development, survival, pupal sizc, and fecundity as well as population parameters such as intrinsic rate of population increase (r) and mean generation time. Major findings include the following: i) no consistent quantitative relationships existed between r and its chief demographic determinants such as preadult developmental time and adult fecundity; and ii) few correlations existed among the cohort life history parameters themselves. The principle conclusion is that the medfly is a successful generalist frugivore because of its developmental ability to offset the effect of the value for a host-specific trait that tends to lower r with one that tends to increase r, the net result of which is to maintain a relatively high r.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379420
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ammonia assimilation and metabolism byBeggiatoa alba (1985)
    Springer
    Archives of microbiology 142 (1985), S. 275-278 
    Details
    ISSN: 1432-072X
    Keywords: Beggiatoa alba ; Glutamine synthetase ; Glutamate synthase ; Alanine dehydrogenase ; Methionine sulfoximine ; Ammonia metabolism ; Covalent modification ; Nitrogen metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Beggiatoa alba B18LD was investigated for its pathways of ammonia assimilation. The increase in growth yields ofB. alba with excess acetate was linear from 0.1 to 2.0 mM ammonia.B. alba had strong glutamine synthetase (GS) and glutamate synthase (GOGAT) activities, irrespective of the ammonia concentration in the medium. Glutamate dehydrogenase activity was not found, and alanine dehydrogenase (aminating) was observed only whenB. alba was grown at high (2.0 mM) ammonia. Methionine sulfoximine, an inhibitor of GS, inhibited growth ofB. alba irrespective of the ammonia concentration in the medium. Thus it appears the primary pathway for ammonia assimilation inB. alba is via the GS-GOGAT pathway at both low and high ammonia concentrations. Preliminary experiments were unable to discern if theB. alba GS is modified by covalent modification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693403
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Utilization of nitrate byBeggiatoa alba (1985)
    Springer
    Archives of microbiology 142 (1985), S. 279-284 
    Details
    ISSN: 1432-072X
    Keywords: Beggiatoa alba ; Assimilatory nitrate reduction ; Nitrate reductase ; Nitrogen metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Beggiatoa alba B18LD utilizes both nitrate and nitrite as sole nitrogen sources, although nitrite was toxic above 1 mM.B. alba coupledin vivo acetate oxidation, but not sulfide oxidation, with nitrate and nitrite reduction.B. alba could not, however, grow anaerobically with nitrate as the sole electron acceptor. Furthermore, the incorporation of acetate into macromolecules under anaerobic conditions with nitrate as the sole electron acceptor was less 10% of the incorporation with oxygen as the electron acceptor. The product of nitrate reduction byB. alba was ammonia; N2 or N2O were not produced. The nitrate reductase activity inB. alba was soluble and it utilized reduced flavins or methyl viologen and dithionite as electron donors. Pyrimidine nucleotides were not used as in vitro electron donors, either alone or with flavins in coupled assays. TheB. alba nitrate reductase activity was competitively inhibited with chlorate and was only mildly inhibited by azide and cyanide. Nitrate was not required for induction of theB. alba nitrate reductase, and neither oxygen nor ammonia repressed its activity. Thus,B. alba nitrate reductase appears to be an assimilatory nitrate reductase with unusual regulatory properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693404
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...