Sökning: "spiggin"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet spiggin.

  1. 1. Evaluation of Biomarker Responses in Fish : with Special Emphasis on Gill EROD Activity

    Författare :Carin Andersson; Jan Örberg; Björn Brunström; Lars Förlin; Uppsala universitet; []
    Nyckelord :Biology; three-spined stickleback; biomarker; EROD; ethynylestradiol; gill; vitellogenin; spiggin; CYP1A inducers; humic substances; sperm quality; biomonitoring; Biologi;

    Sammanfattning : Many chemicals present in the aquatic environment can interfere with physiological functions in fish. Exposure to chemicals can be revealed by the use of biomarkers. Induction of 7-ethoxyresorufin O-deethylase (EROD) activity is a commonly used biomarker for exposure to CYP1A inducers such as dioxins and polyaromatic hyrdrocarbons. LÄS MER

  3. 2. Androgenic Effects of the Progestin Levonorgestrel in Three-spined Stickleback (Gasterosteus aculatus)

    Författare :Johan Svensson; Björn Brunström; Ingvar Brandt; Emma Wincent; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biologi med inriktning mot ekotoxikologi; Biology with specialization in Environmental Toxicology;

    Sammanfattning : The extensive use of pharmaceuticals and their poor removal by wastewater treatment plants has led to the emergence of pharmaceutical compounds as global aquatic contaminants. Progestins, the synthetic analogues to progesterone, are receiving increasing attention as contaminants and have been shown to impair reproduction in fish and amphibians at low ng L-1 concentrations. LÄS MER

  4. 3. Progestagenic Aquatic Contaminants Act as Potent Androgens in Fish : Experimental Studies in Three-spined Stickleback and Zebrafish

    Författare :Johan Svensson; Björn Brunström; Ingvar Brandt; Ian Mayer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pharmaceuticals as contaminants; Progestins; Androgenic properties; Fish; Biologi med inriktning mot ekotoxikologi; Biology with specialization in Environmental Toxicology;

    Sammanfattning : The extensive use of pharmaceuticals and their poor removal by wastewater treatment plants has led to the emergence of pharmaceutical compounds as global aquatic contaminants. Progestins, the synthetic analogues to progesterone (P4), are receiving increasing attention as contaminants and have been shown to impair reproduction in fish and amphibians at low ng L-1 concentrations. LÄS MER

  5. 4. Role of 11-ketotestosterone and prolactin in the control of reproductive behaviour in the male three-spined stickleback, Gasterosteus aculeatus

    Författare :Miklós K. Páll; Rui Oliveira; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reproductive behaviour; three-spined stickleback; Gasterosteus aculeatus;

    Sammanfattning : The male three-spined stickleback, Gasterosteus aculeatus, builds a nest by glueing plant material together using an 11-ketotestosterone (11kT) induced protein (spiggin) secreted from the kidney. When females have been induced to lay eggs in the nest, male sexual (zigzag) behaviour decreases and parental care (fanning) increases. LÄS MER

  7. 5. Target organs for androgens in two teleost fishes, Atlantic salmon, Salmo salar, and three-spined stickleback, Gasterosteus aculeatus

    Författare :Staffan Jakobsson; Scott P. Alexander; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zoologi; Zoology;

    Sammanfattning : The major androgen in male teleost fishes is 11-ketotestosterone (11KT) and not testosterone (T) as in mammals. 11KT has often been found to be more effective than T in stimulating teleost male secondary sexual characters (SSC's). LÄS MER