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    Wyświetlanie 1-5 z 5
    Tytuł:
    Plant regeneration from immature inflorescence-derived callus of Italian ryegrass [Lolium multiflorum Lam.]: chromosome number and fertility of regenerated plants
    Autorzy:
    Zwierzykowski, Z
    Rybczynski, J.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044256.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chromosome structure
    plant regeneration
    female fertility
    callus culture
    chromosome number
    meiotic behaviour
    Italian rye-grass
    breeding method
    callus induction
    plant breeding
    Lolium multiflorum
    immature inflorescence
    Opis:
    Twenty field-grown genotypes of diploid Italian ryegrass (Lolium multiflorum Lam., 2n = 2x = 14) were tested for their ability to induce callus and regenerate plants. Callus cultures were initiated from segments of immature inflorescences cultured on the MS medium supplemented with 4.0 mg L⁻¹ 2,4-D. The calluses were subcultured first on the maintaining medium (MS medium with 2.0 mg L⁻¹ 2,4-D) and later on the rooting medium (MS medium with 0.2 mg L⁻¹ 2,4-D). The frequency of callus induction varied depending on the source of explant and the initial genotype. A total of 473 green plantlets were regenerated, of which 420 were established in the soil. All these plants had the morphological characteristics of Italian ryegrass. Among 372 regenerants analysed cytologically, 302 (81.2%) had the expected diploid chromosome number (2n = 2x= 14), 65 (17.5%) were tetraploid (2n = 4x = 28); several aneuploids and mixoploids were also observed. All diploid and tetraploid regenerants were male and female fertile. However, a great variation of female fertility within and between both groups of regenerants was observed.
    Źródło:
    Journal of Applied Genetics; 1998, 39, 3; 217-224
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zdrowie reprodukcyjne kobiet – analiza poziomu wiedzy młodych studiujących kobiet w zakresie problematyki prokreacji
    Autorzy:
    Walentynowicz-Moryl, Katarzyna
    Mianowska, Edyta
    Powiązania:
    https://bibliotekanauki.pl/articles/1789798.pdf
    Data publikacji:
    2020-05-27
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    fertility
    fertility awareness
    female students
    education
    Opis:
    The main purpose of the article is to establish the level of knowledge about fertility among female students of the University of Zielona Góra. The presented analyses used part of the empirical material from the project “The role of fertility assumptions in the formation of procreative intentions” carried out on a representative sample of full-time female students of the University of Zielona Góra. The respondents have the highest level of fertility knowledge related to changes in women’s reproductive abilities with age. However, it should be noted that their awareness in this aspect is rather medium. For the most part, they correctly identify the age at which the woman is most fertile and the age at which her ability to conceive is significantly reduced. However, the vast majority of respondents are convinced that the process of reducing the ability of women to become pregnant begins later than in reality. As for the other two dimensions of fertility knowledge – the dimension related to estimating the chances of getting pregnant and the dimension related to infertility – the women are characterised by their low or average level. Most of the respondents overestimate the chances of pregnancy of a young woman (up to 25 years old), who had unprotected intercourse at the time of ovulation and a woman who, aged 25–30, had unprotected intercourse regularly during a period of one year. More than half of female students are aware of the scale of infertility in Poland, but at the same time most of them overestimate the effectiveness of in vitro fertilisation. The results obtained are similar to those obtained by researchers from other countries. Therefore, it is necessary to postulate including to the educational program the knowledge about the specificity of the human body, which is characterised by limited ability to conceive a child and changes in the fertility level of women appearing with age.
    Źródło:
    Kwartalnik Pedagogiczny; 2020, 65(1 (255)); 160-173
    0023-5938
    Pojawia się w:
    Kwartalnik Pedagogiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Relationship between Fertility and Female Participation in the Labour Force in OECD Countries 2000–2020: It Is (Again) Negative
    Autorzy:
    Milovanović, Miloš
    Powiązania:
    https://bibliotekanauki.pl/articles/22443137.pdf
    Data publikacji:
    2023-10-08
    Wydawca:
    Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
    Tematy:
    Female labour force participation
    fertility rate
    global financial crisis
    total fertility rates
    Opis:
    The cross-sectional association between female labour force participation rates and fertility in developed countries shifted from negative to positive during the 1980s. Ever since then, researchers have applied different statistical approaches; therefore, the present study re-evaluates the results by applying a distinct strategy to the data from2000 to 2020 for 32 countries belonging to the Organization for Economic Co-operation and Development (OECD). Specifically, the data analysis discussed here implemented the so-called „unified“ model, thereby extending the analysis beyond the limitations of the fixed effects (FE) method; namely, by decomposing coefficients within (time-series) and between (cross-sectional) countries‘ effects, the study increased the explanatory power of our statistical model on the relation between fertility level and female labour force participation rate. Eventually, the selected statistical approach has shown the potential to offer a better interpretation of results in comparison to previous studies. Finally, this study confirmed the persistence of a negative trend in a time-series association between labour force participation and fertility.
    Źródło:
    Central European Economic Journal; 2023, 10, 57; 254-274
    2543-6821
    Pojawia się w:
    Central European Economic Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pieniężne instrumenty polityki rodzinnej a dzietność i aktywność zawodowa kobiet
    Family cash benefits, fertility and female labour supply
    Autorzy:
    Zajkowska, Olga
    Powiązania:
    https://bibliotekanauki.pl/articles/1827575.pdf
    Data publikacji:
    2020-12-30
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    family policy
    fertility
    child benefits
    female labour supply
    polityka rodzinna
    dzietność
    zasiłki na dzieci
    Opis:
    Dzietność poniżej prostej zastępowalności pokoleń występująca w krajach rozwiniętych, a zwłaszcza niska dzietność utrzymująca się w wielu z nich, stanowi ważną przesłankę dyskusji o rozwiązaniach polityki rodzinnej wspierających wzrost dzietności. Jednym z narzędzi polityki rodzinnej są zasiłki na dzieci. Artykuł podejmuje próbę przeglądu  skuteczności różnych form świadczeń pieniężnych na dzieci zarówno w odniesieniu do dzietności jak i pracy zawodowej kobiet. Zwrócono też uwagę na inne efekty, w tym związane z dobrostanem dzieci. Wyniki prowadzą do wniosku, zgodnego z ustaleniami innych analiz porównawczych, że wpływ na dzietność tych świadczeń jest zależny od kontekstu instytucjonalnego, w  jakim są wdrażane. Zwraca też uwagę na konieczność rozpatrywania zasiłków wraz z innymi instrumentami polityki rodzinnej.
    The fertility rate below the replacement rate in developed countries, and especially the lowest low fertility persisting in many of them, is an important premise for the discussion on family policy solutions supporting the fertility recuperation. One of the tools of family policy are child benefits. The article attempts to review the effectiveness of various forms of cash benefits for children, both in relation to fertility and labour supply of women. Other effects were also noted, including those related to the well-being of children. The results lead to the conclusion, in line with the findings of other studies on different countries, that the impact of these benefits on fertility depends on a country’s institutional context. The need to consider benefits together with other instruments of family policy is also stressed.
    Źródło:
    Studia Demograficzne; 2020, 177, 1; 61-105
    0039-3134
    Pojawia się w:
    Studia Demograficzne
    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
      Wyświetlanie 1-5 z 5

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