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    Wyświetlanie 1-4 z 4
    Tytuł:
    Feromony - unikalny język świata przyrody
    Pheromones - an unique language in the natural world
    Autorzy:
    Antkiewicz, Monika
    Dziurdzia, Anna
    Sochaj, Alicja
    Mika, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1197637.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Chemical signaling is probably one of the oldest forms of communication between living species. The substances known as pheromones are chemicals evoking a natural behavioral response in another member of the same species. They can be divided into few groups depending on their function such as: alarm, sex, epideictic, releaser, primer, territorial, aggregation or trial pheromones. Their presence among insects has been well described, although many vertebrates and plants also communicate this way. To make the chemical communication happen between organisms, pheromones have to reach proper receptors located on the surface of the recipient cells. In vertebrates chemosensory organ for pheromones is called vomeronasal organ (VNO). It is located ventrolaterally to the nasal septum. VNO is a tube-like structure lined with a sensory epithelium. The primary receptor neurons of the organ are bipolar with axons that terminate in the accessory olfactory bulb. Semiochemical signals are then transmitted to the emotional centre of the brain. Because of the fact that pheromones are detected subconsciously, VNO is often called "the sixth sense". VNO is well developed in most mammals. The presence of this organ has also been confirmed in about 50% people. Research conducted on animal pheromones was essential to give a better understanding of the mechanisms underlying animal behaviour. This knowledge can be used in order to for example protect endangered species. Pheromones can be also used commercially. The classical example are perfumes, where natural animal pheromones are now replaced by synthetic ones. In addition, for the last decades there have also been attempts to use pheromones in flight against insect. To sum up, the world of the pheromones is very diversed and still posses a lot of secrets. Surely, a lot of discoveries in this discipline is still ahead of us.
    Źródło:
    Kosmos; 2008, 57, 1-2; 127-134
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czy wszystkie sklonowane zwierzęta starzeją się tak samo? Telomery i telomeraza - czy są jakieś różnice?
    Do all cloned animals age in the same way - telomeres and telomerase, is there any difference?
    Autorzy:
    Antkiewicz, Monika
    Young Abrahamsen, Elizabeth
    Langnes, Belinda
    Opsahl Sorteberg, Hilde-Gunn
    Powiązania:
    https://bibliotekanauki.pl/articles/1197628.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    In discussions regarding modern biotechnology, cloning is the word commonly associated with this field of knowledge. This is a direct result of the world famous cloning of "Dolly" in 1997. Even though, the technology have been developed several years ago it is still in its infancy, and years might go by before good solutions are developed. What has to be noticed is that only a small percentage of cloning experiments will lead to viable offspring, and in addition, the lifespan of cloned animals seems to be shorter than their donor ancestors and sibling from normal reproduction. "Dolly's" early death led to many questions, among them; did the cloning process accelerate aging? Subsequently, many studies have been performed to find a reason for Dolly early aging. As a result, it was stated that this animal inherited shortened telomeres from the donor cell, and that was the reason for the rapid aging process. Since then many various animals have been successfully cloned. Different observations suggest that the age of the donor cell used in somatic cell nuclear transfer technique not necessarily affect the aging of cloned animals. The telomere length in animals that underwent the cloning procedure vary based on species, age, gender, cell type, culturing environment and so on. It is also important to consider genetic facts in donor animals, when telomere length seems to vary within the species. It is shown that telomere length can give an indication on cell senescence, but is not necessarily related to the aging of the organism. Different results presented in the articles imply that there is no straightforward answer when comes to early aging of cloned animals. Still there are many unanswered questions. Future research will provide us with deeper knowledge of these mechanisms, necessary for optimizing of the cloning procedure.
    Źródło:
    Kosmos; 2008, 57, 1-2; 119-125
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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