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  • isozymes  (10)
  • Drosophila melanogaster
  • Springer  (17)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • International Union of Crystallography
  • Springer Nature
  • 2015-2019
  • 1985-1989
  • 1975-1979  (17)
  • 1970-1974
  • 1960-1964
  • 1950-1954
  • 1975  (17)
Collection
Keywords
Publisher
  • Springer  (17)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • International Union of Crystallography
  • Springer Nature
Years
  • 2015-2019
  • 1985-1989
  • 1975-1979  (17)
  • 1970-1974
  • 1960-1964
    • +
Year
  • 1
    Electronic Resource
    Electronic Resource
    Nutritional control of xanthine dehydrogenase. II. Effects on xanthine dehydrogenase and aldehyde oxidase of culturing wild-type and mutant Drosophila on different levels of molybdenum (1975)
    Springer
    Biochemical genetics 13 (1975), S. 53-64 
    Details
    ISSN: 1573-4927
    Keywords: aldehyde oxidase ; xanthine dehydrogenase ; Drosophila melanogaster ; molybdenum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two new mutants, deficient in aldehyde oxidase and xanthine dehydrogenase, have been isolated from a wild-type stock of Drosophila melanogaster and have been provisionally termed lxd c and lxd d, respectively, as both mutants appear to be allelic with lxd (low xanthine dehydrogenase). An analysis has been made of the effects of dietary molybdenum on lxd, lxd c, lxdd, lao (low aldehyde oxidase), mal (maroon-like eye color), and pac (Pacific) wild-type flies. On the lower dietary levels of 10 −3 M and 10 −2 M molybdenum, increases in specific activity of both enzymes were observed only in lxd. Furthermore, two- to three-fold increases in specific activity of both enzymes occurred in all strains, except mal, when cultured on 5×10 −2 M molybdenum. The lxd and lxd c strains failed to survive on this high concentration of the ion. Similar concentrations of molybdenum had no effect in vitro. An extra electrophoretic band of xanthine dehydrogenase was observed on polyacrylamide gel from extracts of wild-type flies cultured on certain levels of molybdenum, but its appearance was not always correlated with the increases in specific activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486006
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  • 2
    Electronic Resource
    Electronic Resource
    Variation in the isozymes of flax (Linum usitatissimum) genotrophs (1975)
    Springer
    Biochemical genetics 13 (1975), S. 687-697 
    Details
    ISSN: 1573-4927
    Keywords: flax ; environmental induction ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Peroxidase, esterase, and acid phosphatase isozymes of environmentally induced L and S genotrophs, nuclear DNA reversion types, and the original plastic (Pl) type of the flax variety Stormont Cirrus have been compared by polyacrylamide gel electrophoresis. Differences were observed in particular genotrophs in terms of peroxidase and acid phosphatase isozymes but not in the esterase isozymes. The isozyme pattern of a particular line was not correlated with the nuclear DNA amount. The relationship between the isozyme pattern and the phenotypes of the lines in which they are expressed is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484926
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  • 3
    Electronic Resource
    Electronic Resource
    Transport defects as the physiological basis for eye color mutants of Drosophila melanogaster (1975)
    Springer
    Biochemical genetics 13 (1975), S. 603-613 
    Details
    ISSN: 1573-4927
    Keywords: transport mutants ; eye color mutants ; kynurenine ; Drosophila melanogaster ; Malpighian tubules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Kynurenine-H 3 transport and conversion to 3-hydroxykynurenine were studied in organ culture using the Malpighian tubules and developing eyes from wild type and the eye color mutants w, st, 1td, ca, and cn of Drosophila melanogaster. Malpighian tubules from wild type have the ability to concentrate kynurenine and convert it to 3-hydroxykynurenine. The tubules from w, st, 1td, and ca are deficient in the ability to transport kynurenine, as are the eyes of the mutants w, st, and 1td. This defect in kynurenine transport provides a physiological explanation for the phenotypic properties of the mutants. The relationship of these measurements to previous observations on these eye color mutants is discussed and the transport defect hypothesis is consistently supported. We have concluded that several of the eye color mutants in Drosophila are transport mutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484918
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  • 4
    Electronic Resource
    Electronic Resource
    Ontogeny of lactate dehydrogenase isozymes in chicken-quail hybrid embryos (1975)
    Springer
    Biochemical genetics 13 (1975), S. 7-18 
    Details
    ISSN: 1573-4927
    Keywords: chicken-quail hybrid ; lactate dehydrogenase ; isozymes ; starch gel electrophoresis ; allelic regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ontogeny of lactate dehydrogenase (LDH) isozymes was examined in avian hybrids and compared with the isozyme patterns of the parental species. Hybrids were obtained by crossing female Japanese quail (Coturnix coturnix japonica) with male domestic chickens (Gallus gallus domesticus). By use of starch gel electrophoresis and an enzyme-specific stain, traces of embryonic paternally derived LDH were detected in unincubated hybrid eggs. It was concluded that the embryonic genes coding for the B subunits of LDH are activated during the hours between fertilization and oviposition. In early blastoderms, a great excess of maternally stored LDH is present. In the hybrid, the predominantly maternal pattern of isozymes shifts during embryogenesis to a predominantly paternal pattern. This was considered evidence for differential allelic regulation of LDH inactivation. A progressive trend toward the establishment of the adult distribution of isozymes in various tissues was also observed in the hybrid and quail, and found to be similar to chicken LDH isozyme ontogeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486002
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  • 5
    Electronic Resource
    Electronic Resource
    Use of internal standards in electrophoretic surveys of enzyme polymorphism (1975)
    Springer
    Biochemical genetics 13 (1975), S. 833-847 
    Details
    ISSN: 1573-4927
    Keywords: electrophoresis ; enzyme polymorphism ; internal standards ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract General criteria are described for selecting internal standards for electrophoretic gels. Gel sieving behavior is used to characterize the size and charge of enzymes of interest and of putative standard proteins. For a variety of enzymes of the butterfly Colias meadii, hemoglobin and ferritin are shown to be effective standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484414
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  • 6
    Electronic Resource
    Electronic Resource
    A simple method for the quantitation of isozyme patterns (1975)
    Springer
    Biochemical genetics 13 (1975), S. 805-812 
    Details
    ISSN: 1573-4927
    Keywords: isozymes ; zone electrophoresis ; quantitative methods ; densitometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Isozyme patterns may be analyzed quantitatively, without the use of a densitometer, by performing serial twofold dilutions of a sample to a visual end point. The specific activity (S) of a given dehydrogenase isozyme can be assessed in the presence of other isozymes catalyzing the same reaction, by (1) determining the isozyme titer (T) (defined as mg protein/ml in the last visible band) and (2) applying the formula S=K/T, where K is 1.6×10−3 units/ml in the last visible band. The units/ml (U) in the starting material can be calculated from the equation U=K (2) n−1, where n is the number of the slot producing the last visible band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484412
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  • 7
    Electronic Resource
    Electronic Resource
    A study on lactate dehydrogenase isozymes in rat ova (1975)
    Springer
    Biochemical genetics 13 (1975), S. 65-72 
    Details
    ISSN: 1573-4927
    Keywords: lactate dehydrogenase ; isozymes ; immunohistochemistry ; rat ova
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The presence of subunits A and B has been demonstrated in mature rat ova by several means, including the immunohistochemical method of Coons, use of antisera against LDH-1 (B4) and LDH-5 (A4) isozymes, and polyacrylamide gel electrophoresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486007
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  • 8
    Electronic Resource
    Electronic Resource
    Esterase polymorphism in the corn earworm, Heliothis zea (Boddie): A survey of temporal and spatial allelic variation in natural populations (1975)
    Springer
    Biochemical genetics 13 (1975), S. 885-898 
    Details
    ISSN: 1573-4927
    Keywords: Heliothis zea ; esterases ; isozymes ; allelic variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Allelic variation at the Est-II locus was investigated in 22 natural populations of Heliothis zea from maize, separated spatially and temporally. Of the four alleles observed, Est-II b was the predominant one in every population. The relative frequency of Est-II b ranged from 0.57 to 0.85, with a mean of 0.72±0.06, and proved to be remarkably stable in space and time. Temporal changes in Est-II allele frequencies were observed at two of the sampling localities; however, principal component analysis and multiple correlation of genetic and environmental components have provided persuasive evidence that abiotic environmental or geographic variation is not related to differences in Est-II allele frequencies. Possible factors responsible for the maintenance of this polymorphism are discussed and include possible effects of the chemical composition of host plants and pesticides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484418
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  • 9
    Electronic Resource
    Electronic Resource
    Variants of α-glycerophosphate dehydrogenase in diploids and triploids of Drosophila melanogaster (1975)
    Springer
    Biochemical genetics 13 (1975), S. 263-271 
    Details
    ISSN: 1573-4927
    Keywords: allozymes ; α-glycerophosphate dehydrogenase ; Drosophila melanogaster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract On the basis of band staining intensities in electrophoretic runs of single flies homozygous and heterozygous for two alleles at the autosomal locus for GPDH, F allele activity is believed to be 8% lower than S allele activity. Indeed, the intensity distribution in the patterns of FSS and FFS triploid females shows that both are not equally expressed. On a per fly or live weight basis, females with two and three doses of the Gpdh gene show bands with equal staining intensity, thus exhibiting a dosage effect when GPDH activity is estimated on a per cell basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486021
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  • 10
    Electronic Resource
    Electronic Resource
    Genetic aspects of quantitative variation in the carbonic anhydrases of the pig-tailed macaque, Macaca nemestrina. I. Response to thyroxine (1975)
    Springer
    Biochemical genetics 13 (1975), S. 673-686 
    Details
    ISSN: 1573-4927
    Keywords: primate carbonic anhydrases ; genetics ; thyroxine ; isozymes ; Macaca nemestrina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Effects of thyroxine on incorporation of l-serine-C14 into four carbonic anhydrase isozymes (CA II, CA Ia, CA Ib, CA Ic) and hemoglobin were quantified in reticulocytes of Macaca nemestrina in vitro. Response to thyroxine differed significantly between CA Ia and two allelic variants (CA Ib and CA Ic) and the nonallelic isozyme (CA II). The effects of thyroxine on serine incorporation into hemoglobin and three of the carbonic anhydrase isozymes were shown to be nonlinear with thyroxine concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484925
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