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  • 1
    Electronic Resource
    Electronic Resource
    Maturation and senescence of an insect chemosensory response (1979)
    Springer
    Journal of chemical ecology 5 (1979), S. 587-594 
    Details
    ISSN: 1573-1561
    Keywords: Electroantennogram ; acceptors ; Pseudaletia unipuncta ; maturation ; senescence ; age ; benzaldehyde ; benzyl alcohol ; male pheromone ; Lepidoptera ; Noctuidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennogram responses of male and femalePseudaletia unipuncta to the two major components of the presumed pheromone associated with the male anterior abdominal scent brushes vary with age. There is a postemergence period of maturation of responsiveness, followed by senescence. The age of maximum responsiveness differs according to the sex and to the compound tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987843
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleotide sequence of a highly repeated DNA sequence and its chromosomal localization in Allium fistulosum (1995)
    Springer
    Theoretical and applied genetics 90 (1995), S. 312-316 
    Details
    ISSN: 1432-2242
    Keywords: Allium fistulosum ; Repeated DNA sequence ; In situ hybridization ; Nucleotide sequence ; C-banding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A highly repeated DNA sequence with a repeating unit of approximately 380bp was found in EcoRV digests of the total genomic DNA of Allium fistulosum. Three independent clones containing this unit were isolated, and their repeating units sequenced. These units showed more than 94% sequence homology, and the copy number was estimated to be about 2.8×106 per haploid genome. In situ hybridization, with the repeating unit as a probe, and C-banding analyses indicated that the repeated DNA sequence of A. fistulosum is closely associated with the major C-heterochromatin in the terminal regions of all 16 chromosomes at mitotic metaphase. The characters of the repeating unit are similar to those of the A. cepa unit, which is taxonomically closely related to A. fistulosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221970
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  • 3
    Electronic Resource
    Electronic Resource
    Regional replication of the bacterial chromosome induced by derepression of prophage lambda (1978)
    Springer
    Molecular genetics and genomics 167 (1978), S. 83-93 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Derepression of prophage λ in E. coli strain K12 results in constitutive synthesis of the enzymes directed by the nearby bacterial operon, gal (escape synthesis). Phage 82 fails to cause escape synthesis despite that it lysogenizes the strain K12 at the site identical to that of λ on the host chromosome. The reason for the observed difference between 82 and λ is studied in the light of the recent finding that escape synthesis in λ-lysogen is closely associated to phage-promoted replication of bacterial chromosome contiguous to the prophage including gal operon (escape replication). Excision-defective mutants from 82, 82int or 82xis, do initiate escape synthesis, suggesting that the prophage 82 is normally excised too quickly after induction to allow sufficient escape replication. In support of this, much more DNA hybridizable to bacterial DNA contained in λgal accumulates after induction of 82int than after induction of 82. Studies with various hybrid phages between 82 and λ have suggested: 1. The occurrence of gal escape synthesis depends on the nature of the region between b2 and N in the λ map. 2. Regions of the 82 genome on both sides of the attachment site contribute independently to prevent gal escape synthesis. Implications of these results are discussed with regard to the factors involved in the prophage excision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270324
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence of the growth factor in mouse serum infected withSpirometra erinacei plerocercoids (1986)
    Springer
    Parasitology research 72 (1986), S. 83-87 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To investigate the action of the growth factor secreted bySpirometra erinacei plerocercoids, various organ weights, body weight and head-body length were measured in Snell normal and dwarf mice after injection with the serum from mice and rats. Serum from mice infected with the plerocercoids caused significant increases in the weights of the liver and spleen, in the same manner as mice infected with the plerocercoids. However, serum from rats infected with plerocercoids did not cause significant changes in these parameters. The growth factor in the serum of mice infected with plerocercoids was stable at −20°C for at least 6 months and easily passed through the peritoneum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927738
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray microanalysis of calcareous corpuscles and trace element content in diphyllobothriid cestodes (1988)
    Springer
    Parasitology research 74 (1988), S. 498-500 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535154
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  • 6
    Electronic Resource
    Electronic Resource
    Carbohydrate metabolism in intact golden hamsters infected with plerocercoids of Spirometra erinacei (Cestoda: Diphyllobothriidae) (1987)
    Springer
    Parasitology research 74 (1987), S. 183-187 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract This study was performed to investigate the mechanism involved in a decrease in the serum glucose of golden hamsters infected with plerocercoids of Spirometra erinacei. The concentration of glucagon, the activity of glucose-6-phosphatase in the liver, and the in vivo incorporation of 2-deoxyd-[1,2-3H]glucose into various organs increased in plerocercoid-infected hamsters compared with controls. Furthermore, the serum from the plerocercoid-infected hamsters enhanced the in vitro incorporation of [U-14C]glucose into adipose tissues, compared with control serum. The serum levels of immunoreactive insulin and somatomedin associated with nonsuppressible insulin-like activity in experimental animals, however, were not significantly different from those in controls. Therefore, we conclude that the decrease in serum glucose associated with plerocercoid infection is not the result of a decrease in gluconeogenesis, but the result of an increased utilization of glucose in the peripheral tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536031
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of infection with Spirometra erinacei plerocercoid on thyroid hormone in mice (1988)
    Springer
    Parasitology research 74 (1988), S. 262-266 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Young, male ICR mice were given tap water or distilled water containing 200 mg/l propylthiouracil (PTU) and were then infected with 10 plerocercoids of Spirometra erinacei to investigate the effect of plerocercoid infection on thyroid hormone in their hosts. Plerocercoid infection stimulated growth in PTU-induced hypothyroid mice as if they had never received PTU treatment: there were increases in weight in the liver, skeletal muscle, and spleen, as well as enhancement of the head and body length, in spite of a greater decrease in serum T4 levels than was observed in PTU-treated controls. Furthermore, the intact mice infected with plerocercoids showed a decrease in serum T4 levels as well as in the concentration of T4-binding globulin. These observations suggest that the growth stimulation and the decrease in concentrations of serum T4 and T4-binding globulin associated with plerocercoid infection in mice probably resulted from secretion of a growth hormone-like substance produced by plerocercoids of S. erinacei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539575
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  • 8
    Electronic Resource
    Electronic Resource
    Decrease of liver glycogen content in golden hamsters infected with plerocercoids ofSpirometra erinacei (1991)
    Springer
    Parasitology research 77 (1991), S. 320-324 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Liver glycogen content decreased in golden hamsters experimentally infected with plerocercoids ofSpirometra erinacei. The activity of glycogen synthasea decreased significantly in infected animals, whereas that of glycogen phosphorylasea was not significantly affected. These observations suggest that changes in glycogen content were not attributable to increased glycogenolysis, but rather resulted from suppressed glycogenesis. Plasma immunoreactive insulin (IRI) concentrations in infected animals were slightly lower than those in controls, but the differences were not statistically significant. Plasma glucagon concentrations were significantly higher in infected animals. These results suggest that the suppression of glycogen synthase activity inS. erinacei-infected hamsters was attributable to enhanced levels of glucagon and that enhanced secretion of glucagon was caused by parasite-induced hypoglycemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930908
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  • 9
    Electronic Resource
    Electronic Resource
    Biological effects ofSpirometra erinacei plerocercoids in several species of rodents (1983)
    Springer
    Parasitology research 69 (1983), S. 489-499 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Observations were made of the biological effects of infection with plerocercoids ofSpirometra erinacei on normal female Snell mice, male chinese hamsters, golden hamsters, normal and hypox rats. Plerocercoid infection caused the strongest growth-promoting effect on normal Snell mice. In mice, this effect appears to be independent of strain. Chinese hamsters infected with these larvae showed similar growth. The infected normal rats and golden hamsters, however, showed a weight increase in the skeletal muscle only, while the hypox rats exhibited no effect at all. The elevation in the concentration of serum triglyceride was observed in all the animals investigated except for rats. Golden hamsters, in particular, exhibited a marked increase in the concentration of serum free fatty acids and total cholesterol. There was close correlation between the concentrations of serum triglyceride and free fatty acids, and the regression coefficient of the resulting linear regression equation for the experimentals was higher than that for the controls. This suggests that serum triglyceride results from an increased concentration of serum free fatty acids derived from stimulated lipolysis. The total cholesterol concentration in the serum decreased in chinese hamsters infected with larvae. The serum glucose concentration increased in normal Snell mice but decreased in chinese and golden hamsters. No difference in glycerol and free fatty acid concentration was observed in infected animals except for golden hamsters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927705
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  • 10
    Electronic Resource
    Electronic Resource
    Hepatotrophic activity in mouse serum infected with plerocercoids ofSpirometra erinacei (1994)
    Springer
    Parasitology research 80 (1994), S. 629-633 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To investigate the mechanism by which liver weight increases during plerocercoid infections as well as the possible existence of a hepatocyte-growth-factor (HGF)-like substance in the serum of mice infected withSpirometra erinacei plerocercoids, liver DNA synthesis was measured in vivo and in vitro. Infection withS. erinacei plerocercoids significantly stimulated DNA synthesis in mouse parenchymal hepatocytes prior to the increase in liver weight, at least partly by stimulating the induction of the salvage pathways of pyrimidine biosynthesis. Furthermore, infected mouse serum directly stimulated DNA synthesis in cultured mouse parenchymal hepatocytes. These results suggest that an HGF-like substance is present in the serum of mice infected withS. erinacei plerocercoids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932943
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