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    Wyświetlanie 1-3 z 3
    Tytuł:
    4-Week inhalation toxicity of 2-methylnaphthalene in experimental animals
    Autorzy:
    Świercz, Radosław
    Wąsowicz, Wojciech
    Stetkiewicz, Jan
    Gromadzińska, Jolanta
    Majcherek, Wanda
    Powiązania:
    https://bibliotekanauki.pl/articles/2185378.pdf
    Data publikacji:
    2011-12-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    2-Methylnaphthalene
    rats
    inhalation
    NOAEL
    LOAEL
    Opis:
    Objectives: This paper presents toxic effects of 2-MN in laboratory animals under conditions of 4-week inhalation exposure to 2-methylnaphthalene (2-MN) vapors. Materials and Methods: Male Wistar rats were exposed to 2-MN vapors at a nominal concentration of 0, 2, 10 or 50 mg/m³ in dynamic inhalation chambers for 4 weeks (6 h/day, 5 days/week). After 4 weeks of inhalation exposure the animals were necropsied. Blood samples were collected and selected organs were weighted and prepared for histological examinations. Results: The effects of the increased levels of exposure to 2-MN experienced by the experimental rats were as follows: a) increasing γ-glutamylotransferase activity, b) stimulation of the hematopoietic system, c) lower cholesterol concentrations, d) higher number of goblet cells in lobar bronchi, e) hyperplasia of hepatic bile ducts. Conclusion: Four-week exposure of the animals to 2-MN at 2 mg/m³ proved to be the no-observed-adverse-effect-level (NOAEL), while 10 mg/m³ appeared to represent the lowest-observed-adverseeffect- level (LOAEL).
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2011, 24, 4; 399-408
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fertility and developmental toxicity studies of diethylene glycol monobutyl ether (DGBE) in rats
    Autorzy:
    Sitarek, Krystyna
    Gromadzińska, Jolanta
    Lutz, Piotr
    Stetkiewicz, Jan
    Świercz, Radosław
    Wąsowicz, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2180019.pdf
    Data publikacji:
    2012-09-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    dimethylene glycol monobutyl ether (DGBE)
    CAS No. 112-34-5
    female and male rats
    fertility
    Opis:
    Objectives The solvent, dimethylene glycol monobutyl ether (DGBE), is a component of latex paints, inks; it is used as a degreasing agent, industrial detergent. The aim of the study was evaluating the effects of DGBE administered by gavage on the estrous cycle and given with drinking water on fertility in rats and early development of their progeny. Materials and Methods Female rats were exposed to DGBE by gavage during 8 weeks at 250, 500 or 1000 mg/kg/day. Vaginal smears were collected during the exposure and 4 weeks after its cessation. Fertility studies were performed in male and female animals exposed to in drinking water. Males were exposed for 10 weeks and then mated with females exposed before mating, during pregnancy and lactation. Young animals were observed during 3 weeks after birth. Results DGBE does not cause disturbances of the menstrual cycle in females. Parameters used to assess the general toxicity indicate that males receiving DGBE in drinking water are more sensitive to this compound than females: significantly greater, dose-dependent relative spleen weight, significant decrease in hematological parameters from 8% to 15% depending on the dose, were observed. Clinical chemistry parameters (HDL-cholesterol, BUN) and some markers of oxidative stress differ between the exposed groups and the control one, but without adverse health effect. The microscopic examination of internal organs did not reveal morphological changes in male and female rats. Conclusion The results of our study on the impact of exposure to DGBE on fertility in rats indicate that the substance administered for 9–10 weeks to females and males at a limit dose of 1000 mg/kg did not impair fertility or viability of their offspring during the first three weeks of life.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2012, 25, 4; 404-417
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developmental toxicity of N-methylaniline following prenatal oral administration in rats
    Autorzy:
    Sitarek, Krystyna
    Gromadzińska, Jolanta
    Stetkiewicz, Jan
    Lutz, Piotr
    Król, Magdalena
    Domeradzka-Gajda, Katarzyna
    Wąsowicz, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2177441.pdf
    Data publikacji:
    2016-02-10
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    rat
    N-methylaniline
    NMA
    developmental toxicity
    metHb
    toxicity
    Opis:
    Objectives The objective of the study was to assess prenatal toxicity of N-methylaniline (NMA) administered by gavage to pregnant female rats. Material and Methods Pregnant female rats were administered N-methylaniline in corn oil by gavage at daily doses of 0.8 mg/kg of body weight (b.w.), 4 mg/kg b.w., 20 mg/kg b.w. and 100 mg/kg b.w. from implantation (the 5th day post mating) to the day prior to the scheduled caesarean section (the 20th day of pregnancy). General behavior, body weight, food and water consumption, hematological, biochemical analyses and pathomorphological changes of the dams were recorded. Results All the females survived until the end of the study. The test substance was toxic to pregnant females, even at the lowest of the used doses, i.e., 0.8 mg/kg b.w./day. Lower weight gain during pregnancy and significantly higher NMA-dose-dependent absolute weight of the organs were noted in the exposed females. The females from the groups exposed at doses of 20 mg/kg b.w./day and 100 mg/kg b.w./day developed anemia and showed higher concentrations of free thyroxine (FT3) and free triiodothyronine (FT4) thyroid hormones. Total protein concentration exhibited an increase in all the exposed groups of females. In the prenatal toxicity study, administration of N-methylaniline throughout the embryonic and fetal periods produced embryotoxic effects at doses ranging 4–100 mg/kg b.w./day. Conclusions Considering the data obtained in this study, it is reasonable to assume that N-methylaniline administered orally to pregnant rats is toxic for mothers even at a low dose of 0.8 mg/kg b.w./day. However, this dose was not associated with any significant effects to their offspring. This prenatal exposure level may be considered as no-observed-adverse-effect level (NOAEL) for the progeny and a dose of 4 mg/kg b.w./day as the lowest-observed-adverse-effect level (LOAEL) for the progeny.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 3; 479-492
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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