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
  • Drosophila melanogaster
  • Springer  (179)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • International Union of Crystallography
  • Springer Nature
  • 2015-2019
  • 1995-1999  (96)
  • 1975-1979  (67)
  • 1970-1974  (16)
  • 1960-1964
  • 1950-1954
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Parasitoid size as a function of host sex: potential for different sex allocation strategies (1999)
    Springer
    Entomologia experimentalis et applicata 92 (1999), S. 289-294 
    Details
    ISSN: 1570-7458
    Keywords: parasitoid size ; Asobara ; host sex ; sex allocation ; Drosophila melanogaster ; parasitic castration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Parasitoid females are known to preferentially allocate female eggs to hosts with the higher resource value, usually leading to oviposition of female eggs in larger hosts and male eggs in smaller hosts. For koinobiont parasitoids, if male and female hosts are of equal size at time of oviposition, but differ in size in later developmental stages, the sex of the host could be used to indicate future resource value. Using parasitoids of the braconid genus Asobara, which are larval parasitoids of Drosophila, it is shown that parasitoids emerging from female hosts are larger than those from male hosts. Given this difference in resource value, ovipositing females should preferentially allocate female eggs to female hosts. An alternative strategy would be to decrease the difference in resource value between male and female hosts by castrating male hosts. The primary sex ratio of A. tabida in their two main host species does not differ between male and female hosts. In contrast to A. tabida, A. citri is known to partially castrate male hosts, but this does not decrease the size difference between male and female hosts. As in A. tabida, there is no difference in sex allocation to male and female hosts in A. citri. Despite the clear difference between the resource value of male and female hosts, these parasitoid species do not seem to make optimal use of this difference. They may not be able to discriminate between host sexes or, alternatively, there is a presently unknown fitness disadvantage to ovipositing in female hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003814619260
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Utilization of a Photosystem by Drosophila melanogaster Larvae (Diptera: Drosophilidae) (1998)
    Springer
    Journal of insect behavior 11 (1998), S. 633-648 
    Details
    ISSN: 1572-8889
    Keywords: Drosophila melanogaster ; larvae ; vision ; mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Foraging-stage third-instar larvae from most wild-type (normal) Drosophila melanogaster stocks are generally repelled by light. To identify factors that affect the larval photoresponse, we elucidated the effects of age, temperature, and time on the photoresponse of larvae from a wild-type Canton-S stock. In addition, we analyzed the larvae from the LI2 isofemale line, which are unresponsive to light in a photoassay. To determine whether LI2 larvae behave abnormally on other behavioral paradigms, in comparison to Canton-S controls, we tested larvae in taste and olfactory assays and observed them to determine whether they dispersed in a food source. Like Canton-S larvae, LI2 larvae and other isofemale lines whose progenitors were collected from the same natural population are responsive to taste and olfactory stimuli. Moreover, LI2 larvae disperse in the food source, as do Canton-S larvae tested in the dark. Larvae expressing parasbl mutations, which respond normally to light but not to chemical stimuli, do not disperse normally in the food source, suggesting that dispersal may be mediated by perception of chemical cues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022342724902
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Sexual Interactions Between Two Distantly Related Drosophila Species, D. melanogaster and D. willistoni (Diptera: Drosophilidae) (1997)
    Springer
    Journal of insect behavior 10 (1997), S. 771-781 
    Details
    ISSN: 1572-8889
    Keywords: Drosophila melanogaster ; Drosophila willistoni ; sexual behavior ; species isolation ; P elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Molecular analysis suggests that the pomace fly Drosophila melanogaster acquired the P family of transposable elements from another Drosophila species, D. willistoni. Since the two species are distantly related, it has been assumed that transmission of P element DNA from D. willistoni to D. melanogaster was mediated by a vector. The possibility of an alternative mode of transmission was assessed by characterizing the sexual behaviors of D. willistoni males and females, then observing D. willistoni and D. melanogaster males and females to see whether males from one species interacted sexually with females from the other species in a laboratory setting. We observed that D. melanogaster males court D. willistoni females vigorously and, in some cases, stimulate the females to be receptive to copulation. However, D. willistoni males perform relatively little courtship in response to D. melanogaster females and do not attempt to copulate. Thus, it is unlikely that sexual interactions effected the transmission of P element DNA from D. willistoni to D. melanogaster in the flies' natural habitat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOIR.0000010412.82958.86
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Resource pH on Pupation Height in Drosophila (Diptera: Drosophilidae) (1998)
    Springer
    Journal of insect behavior 11 (1998), S. 47-57 
    Details
    ISSN: 1572-8889
    Keywords: Drosophila melanogaster ; D. hydei ; pupation height ; pH ; acidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper describes the effects of the pH of the larval resource on the pupation height of two cosmopolitan species of Drosophila: D. melanogaster and D. hydei. The pH levels of “artificial media” were modified using solutions of acids (hydrochloric, acetic, and citric) and a positive relationship was found between pupation height and resource pH; i. e., the more acidic the resource, the closer the larvae pupated to the resource surface. The clearest trends were between pupation height and the final pH of the resource, the larvae apparently responding to the pH they encountered just before pupation commenced. When using natural resources a difference in pupation height was found between the types of fruits used but there was no obvious trend linking pupation height with pH. This suggests that some other environmental factor(s) was (were) overriding the effects of pH, and consequently resource pH may play only a minor role in determining pupation behavior in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020814516158
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Decline in photopositive tendencies with age inDrosophila melanogaster (Diptera: Drosophilidae) (1995)
    Springer
    Journal of insect behavior 8 (1995), S. 835-845 
    Details
    ISSN: 1572-8889
    Keywords: aging ; Drosophila melanogaster ; phototaxis ; locomotor activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phototaxis was measured in young, middle-aged, and oldDrosophila melanogaster flies of both sexes. The apparatus allowed us to measure the tendency to go toward light, independently of the time needed to do so; under such conditions, phototaxis is dissociated from locomotor activity. The percentage of photopositive flies decreased slightly with age (93.96, 80.17, and 78.97%, respectively, in young, middle-aged, and old flies). Results are discussed in connection with previous data for which the tendency to go toward light and the time to do so were not dissociated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02009510
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Genotoxic evaluation of ten carcinogens in theDrosophila melanogaster wing spot test (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 73-76 
    Details
    ISSN: 1420-9071
    Keywords: Carcinogens ; genotoxicity testing ; Drosophila melanogaster ; somatic mutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To provide further background data on the wing spot somatic mutation and recombination assay, 10 selected carcinogens (acetamide, acrylamide, benzo(a)pyrene, cyclophosphamide, diethylstilbestrol, 4-nitroquinoline N-oxide, propyleneimine, safrole, thiourea, and o-toluidine) were tested in this assay. 72-h-old third-instar larvae, trans-heterozygous for 2 recessive wing cell markers:multiple wing hairs (mwh) andflare 3 (flr 3) were fed with 3 concentrations of each carcinogen during the rest of their development until pupation, and the genotoxic effects were measured as significant increases in the appearance of visible mutant hair clones on the adult wing blade. Our results show that 6 of the carcinogens tested produce significant increases in wing spot frequency, at least at one of the concentrations assayed. Benzo(a)pyrene, diethylstilbestrol, safrole and thiourea were the compounds that did not increase the incidence of mutant clones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964923
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Analysis of the relationship between age of larvae at mutagen treatment and frequency and size of spots in the wing somatic mutation and recombination test inDrosophila melanogaster (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 168-173 
    Details
    ISSN: 1420-9071
    Keywords: Genotoxicity ; somatic cells ; spot size ; Drosophila melanogaster ; methyl methanesulfonate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The relationship between the induction of mutant clones and the time of mutagen treatment was studied in the somatic mutation and recombination test (SMART) in wing cells ofDrosophila melanogaster. Larvae trans-heterozygous for the recessive marker mutations multiple wing hairs (mwh) and flare (flr) were produced. Batches of these larvae were then treated with mutagen at different ages spanning all three larval instars. Methyl methanesulfonate was fed acutely for 2 h by immersing the larvae in a solution of the mutagen mixed with powdered cellulose. Wings of the surviving adult flies were mounted and scored for the presence of spots. The frequency and size of single and twin spots were recorded separately. Twin spots are produced exclusively by mitotic recombination, whereas single spots can results from various types of mutational and exchange events. There exists a clear correlation between time of induction and frequency as well as size of the single spots. In young larvae only few but very large spots are induced, whereas in older larvae the frequencies are considerably increased but the sizes are smaller. The twin spots show a different relationship. Practically no twin spots are found in very young and in very old larvae. The results demonstrate that in the wing spot test the optimal age of the larvae for mutagen treatment is 72 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01929364
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Duplication and divergence of the genes of the α-esterase cluster ofDrosophila melanogaster (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 241-252 
    Details
    ISSN: 1432-1432
    Keywords: Esterase ; Gene cluster ; Pseudogene ; Drosophila melanogaster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The α-esterase cluster ofD. melanogaster contains 11 esterase genes dispersed over 60 kb. Embedded in the cluster are two unrelated open reading frames that have sequence similarity with genes encoding ubiquitin-conjugating enzyme and tropomyosin. The esterase amino acid sequences show 37–66% identity with one another and all but one have all the motifs characteristic of functional members of the carboxyl/cholinesterase multigene family. The exception has several frameshift mutations and appears to be a pseudogene. Patterns of amino acid differences among cluster members in relation to generic models of carboxyl/cholinesterase protein structure are broadly similar to those among other carboxyl/cholinesterases sequenced to date. However the α-esterases differ from most other members of the family in: their lack of a signal peptide; the lack of conservation in cysteines involved in disulfide bridges; and in four indels, two of which occur in or adjacent to regions that align with proposed substrate-binding sites of other carboxyl/cholinesterases. Phylogenetic analyses clearly identify three simple gene duplication events within the cluster. The most recent event involved the pseudogene which is located in an intron of another esterase gene. However, relative rate tests suggest that the pseudogene remained functional after the duplication event and has become inactive relatively recently. The distribution of indels also suggests a deeper node in the gene phylogeny that separates six genes at the two ends of the cluster from a block of five in the middle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02338832
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Evolutionary divergence of the cytochrome b5 gene of Drosophila (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 430-439 
    Details
    ISSN: 1432-1432
    Keywords: Cytochrome proteins ; Molecular evolution ; Drosophila melanogaster ; Drosophila virilis ; Gene structure and sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cytochrome proteins perform a broad spectrum of biological functions ranging from oxidative metabolism to electron transport and are thus essential to all organisms. The b-type cytochrome proteins bind heme noncovalently, are expressed in many different forms and are localized to various cellular compartments. We report the characterization of the cytochrome b5 (Cyt-b) gene of Drosophila virilis and compare its structure to the Cyt-b gene of Drosophila melanogaster. As in D. melanogaster, the D. virilis gene is nuclear encoded and single copy. Although the intron/exon structures of these homologues differ, the Cyt-b proteins of D. melanogaster and D. virilis are approximately 75% identical and share the same size coding regions (1,242 nucleotides) and protein products (414 amino acids). The Drosophila Cyt-b proteins show sequence similarity to other b-type cytochromes, especially in the N-terminal heme-binding domain, and may be targeted to the mitochondrial membrane. The greatest levels of similarity are observed in areas of potential importance for protein structure and function. The exon sequences of the D. virilis Cyt-b gene differ by a total of 292 base changes. However, 62% of these changes are silent. The high degree of conservation between species separated by 60 million years of evolution in both the DNA and amino acid sequences suggests this nuclear cytochrome b5 locus encodes an essential product of the Drosophila system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160314
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Transposable elements behavior following viral genomic stress inDrosophila melanogaster inbred line (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 19-27 
    Details
    ISSN: 1432-1432
    Keywords: Drosophila melanogaster ; Transposable element ; Mobilization ; Genomic stress ; Virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To analyze the behavior of endogenous transposable elements under genomic stress, aDrosophila melanogaster inbred line was submitted to three kinds of viral perturbations. First, a retroviral plasmid containing the avian Rous Associated Virus type 2 (RAV-2) previously deleted for the viral envelope coding gene (env) was introduced by P element transformation into theDrosophila genome. An insertion of this avian retroviral sequence was detected byin situ hybridization in site 53C on polytene chromosome arm 2R. Second,Drosophila embryos were injected with RAV-2 particles produced by cell culture after transfection with the retroviral plasmid. Third, theDrosophila melanogaster inbred line was stably infected by the sigma native virus. It appears that neither the offspring of the flies in which the viral DNA was found integrated nor those from the infected sigma flies showed copia or mdgl element mobilization. Injection of the avian RAV-2 particles led, however, to the observation of somatic transpositions of mdgl element on the 2L chromosome, the copia element insertion pattern remaining stable. Thus, endogenous transposable elements show more instability in sublines injected with exogenous viral particles than in a transgenic subline containing a foreign viral insert, all transposable elements not being equally sensitive to such genomic stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02352295
    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...