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  • 1
    Electronic Resource
    Electronic Resource
    Molecular and genetic studies on the euchromatin-heterochromatin transition region of the X chromosome of Drosophila melanogaster (1984)
    Springer
    Chromosoma 89 (1984), S. 218-227 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A recombinant Charon 4 bacteriophage has been isolated on the basis of RNAs which are enriched in the head of the adult Drosophila melanogaster and hence are likely to be of neural origin. The cloned insert maps to the near vicinity of the uncoordinated locus in polytene chromosome band 19E8. This band is within the transition zone between the euchromatic and heterochromatic regions of the X chromosome, a region which has been well characterized cytogenetically. The insert contains both repetitious and low copy number sequences, some of which vary extensively in both frequency and restriction fragment size between different laboratory strains. One particular family of moderately repeated sequences occurs predominantly in divisions 19 and 20 of the X chromosome and perhaps the distally located X heterochromatin. The molecular landscape surrounding the initial entry point contains many repeated sequences and is thus unlike those observed in most published chromosomal walks. The possible significance of the presence of repeated sequence families in the distinct properties of this region are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295003
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  • 2
    Electronic Resource
    Electronic Resource
    Psychosexual dysfunction in women with gynaecological cancer following radical pelvic surgery (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To assess the prevalence and severity of psychosexual dysfunction in women treated for cancer of the cervix and vulva by radical vulvectomy, Wertheim's hysterectomy and pelvic exenteration; and to identify the risk factors for sexual morbidity and ways in which it might be reduced.Design Retrospective study of patients by questionnaire and semistructured interview, 6 months to 5 years following surgery.Setting Gynaecology–Oncology Unit of a general hospital.Patients 105 English speaking women with gynaecological cancer.Results 90% of the women in relationships had been sexually active prior to surgery. Of this group, 24% had no sexual difficulties post-operatively; 66% of the latter still had problems more than 6 months later, and 15% of the latter never resumed intercourse (excluding those with a colpectomy). 82% of those aged less than 50 years who had had radiotherapy suffered sexual dysfunction. Lack of desire was the commonest problem, and half the women felt that their sexual relationship had deteriorated, yet only 16% felt that their marriage had worsened. Younger women were more likely to attribute personal and marital distress to their sexual problems. More information on sexual matters would have been liked by 28% of the women.Conclusions Sexual dysfunction is common following radical pelvic surgery and tends to remain a chronic problem. As well as organic causes there is a strong psychogenie element brought about by loss of fertility, disfigurement, depression and anxiety about one's desirability as a sexual partner. The presence of a stable relationship before the diagnosis of cancer helps women cope better, and young single women are a very vulnerable group. Patients want more information on sexual matters and the provision of sexual counselling may improve outcome in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb12955.x
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of α-toxin from two different strains (NCTC8237 and CER89L43) of Clostridium perfringens (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 1425-1428 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The α-toxin of Clostridium perfringens is the major virulence determinant for gas gangrene in man. The gene encoding the α-toxin has been cloned into E. coli from two strains of the bacterium (NCTC8237 and CER89L43) and subsequently purified to homogeneity. The two strains of α-toxin differ by five amino acids, resulting in the toxin from NCTC8237 being sensitive to chymotrypsin digestion while that from CER89L43 is resistant. The α-toxin from each of these strains has been crystallized in two different forms by the hanging-drop vapour-diffusion method at 293 K. CER89L43 form I crystals belong to space group R32 and have two molecules in the crystallographic asymmetric unit and a unit cell with a = b = 151.4, c = 195.5 Å, α = β = 90, γ = 120°. The crystals diffracted to dmin = 1.90 Å. The characteristics of the NCTC8237 form I crystals have already been reported. The form II crystals from both strains belong to space group C2221 with one molecule in the crystallographic asymmetric unit and, for strain CER89L43, have cell dimensions a = 61.05, b = 177.50, c = 79.05 Å, α = β = γ = 90°, while for strain NCTC8237 the cell dimensions are a = 60.50, b = 175.70, c = 80.20 Å, α = β = γ = 90°. The crystals diffracted to maximum resolutions of 1.85 and 2.1 Å for the CER89L43 and the NCTC8237 strains, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444998005186
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen migration in Fe"3(CO)"9H"4
    Amsterdam : Elsevier
    Inorganica Chimica Acta 203 (1993), S. 43-49 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)82902-3
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  • 5
    Electronic Resource
    Electronic Resource
    Psychosocial adjustment following major gynaecological surgery for carcinoma of the cervix and vulva
    Amsterdam : Elsevier
    Journal of Psychosomatic Research 36 (1992), S. 561-568 
    Details
    ISSN: 0022-3999
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3999(92)90041-Y
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  • 6
    Electronic Resource
    Electronic Resource
    Levels of RNA and DNA in Drosophila melanogaster at different stages of development: A comparison between one bobbed and two phenotypically non-bobbed stocks (1972)
    Springer
    Biochemical genetics 6 (1972), S. 217-230 
    Details
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A bobbed mutant stock of Drosophila melanogaster from which bobbed larvae, pupae, and flies can easily be selected is described in this paper. The RNA levels in these bobbed insects, whether expressed per insect or per milligram of tissue, are lower than in either a wild-type or a non-bobbed $$\overline {XX} Y$$ control stock at all developmental stages investigated. However, the DNA levels, at all developmental stages are similar in both bobbed and non-bobbed insects. The results, which suggest that the maximum rate of ribosomal RNA synthesis and the average ribosome level per cell are lower than normal in these bobbed insects, are discussed in relation to the hypothesis that bobbed mutations bring about reduced rates of ribosome synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486405
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  • 7
    Electronic Resource
    Electronic Resource
    A biochemical study of the scarlet eye-color mutant of Drosophila melanogaster (1975)
    Springer
    Biochemical genetics 13 (1975), S. 273-282 
    Details
    ISSN: 1573-4927
    Keywords: Drosophila ; scarlet mutant ; xanthurenic acid ; 3-hydroxykynurenine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract 3-Hydroxykynurenine is virtually absent from st larvae but accumulates during adult development in the puparium. Over the period of adult emergence, the accumulated 3-hydroxykynurenine is excreted so that st adults contain none. Larvae of st fed on tryptophan-C 14 medium produce labeled 3-hydroxykynurenine, at a reduced rate, perhaps, compared to wild type. Xanthurenic acid levels in st pupae are similar to those in wild type. Thus the failure of st larvae to accumulate 3-hydroxykynurenine does not seem to be due either to an inability to synthesize this compound or to an excessive rate of its conversion to xanthurenic acid. Rather, it appears that the mechanism of 3-hydroxykynurenine storage during larval life is defective, so that this compound is excreted at an abnormally high rate. The inability of the pigment cells of the eyes of st to synthesize xanthommatin may result from a similar defect in their ability to take up or store 3-hydroxykynurenine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486022
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  • 8
    Electronic Resource
    Electronic Resource
    The ommochrome biosynthetic pathway in Drosophila melanogaster: The head particulate phenoxazinone synthase and the developmental onset of xanthommatin synthesis (1976)
    Springer
    Biochemical genetics 14 (1976), S. 1077-1090 
    Details
    ISSN: 1573-4927
    Keywords: xanthommatin synthesis ; phenoxazinone synthase ; eye pigmentation ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Particulate fractions from the heads of Drosophila melanogaster catalyze the conversion of o-aminophenols to phenoxazinones. This particulate enzyme is stimulated by Mn2+. It has a number of features which distinguish it clearly from the Mn2+-dependent activity found in the soluble fraction. The particulate enzyme has a characteristic developmental pattern, showing a marked increase in activity at about the time of onset of xanthommatin synthesis. In addition, it is much reduced in activity in a number of xanthommatin-deficient mutants (v, cn, st, cd, and w). We believe that the head particulate enzyme is involved in xanthommatin biosynthesis and that the developmental onset of synthesis of this pigment is brought about by the synthesis or activation of this enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485139
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  • 9
    Electronic Resource
    Electronic Resource
    Functions of the white and topaz loci of Lucilia cuprina in the production of the eye pigment xanthommatin (1980)
    Springer
    Biochemical genetics 18 (1980), S. 643-653 
    Details
    ISSN: 1573-4927
    Keywords: Xanthommatin synthesis ; transport mutants ; Lucilia cuprina ; eye color mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The white and topaz eye color mutants of L. cuprina are defective in the production of the brown screening pigment xanthommatin. Both white and topaz mutants were found to be unable to accumulate xanthommatin precursors in the larval malpighian tubules, correlating with their reduced early pupal level of this metabolite. In addition, white mutants showed reduced rates of accumulation of kynurenine and 3-hydroxykynurenine in the adult eyes. Another mutant strain, grape, was also defective in its ability to accumulate these xanthommatin precursors in the eyes, although accumulation was normal in the larval tubules. In contrast, the topaz mutants were found to be normal in eye accumulation, although tubule accumulation was markedly abnormal. These properties of the white and topaz mutants of L. cuprina are compared with those of the white and scarlet mutants of D. melanogaster, and it seems likely that in the two species these genes are involved with the uptake or storage of xanthommatin precursors in specific tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484582
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  • 10
    Electronic Resource
    Electronic Resource
    Isolation and biochemical analysis of a temperature-sensitive scarlet eye color mutant of Drosophila melanogaster (1979)
    Springer
    Biochemical genetics 17 (1979), S. 149-158 
    Details
    ISSN: 1573-4927
    Keywords: xanthommatin synthesis ; scarlet mutants ; Drosophila melanogaster ; temperature-sensitive mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Six new EMS-induced scarlet mutants were selected. Four of these were partially pigmented, with xanthommatin levels ranging from 12% to 45% of normal. In one (st 754ts), pigment production was temperature sensitive; the level of xanthommatin changed from less than 10% of normal at 29 C to more than 70% at 18 C. In all of the new mutants tested, the level of early pupal 3-hydroxykynurenine was as low as low as that in st 1. Thus reduced larval accumulation of this metabolite also appears to be a characteristic feature of scarlet mutants. Temperature-pulse and temperature-shift experiments were carried out with st 754ts to determine the temperature-sensitive period for the scarlet gene during development. The major sensitive period commenced prior to the onset of pigmentation and was over before adult emergence. Thus the initiation of xanthommatin synthesis is not brought about by the activation of the scarlet gene. In similar experiments carried out with a temperature-sensitive white mutant (w bl), a similar temperature-sensitive period was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484480
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