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    Wyświetlanie 1-5 z 5
    Tytuł:
    First Jurassic mammals from Kyrgyzstan
    Autorzy:
    Nessov, L A
    Kielan-Jaworowska, Z.
    Hurum, J.H.
    Averianov, A.O.
    Fedorov, P.V.
    Potapov, D.O.
    Froyland, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21388.pdf
    Data publikacji:
    1994
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    docodont ulna
    Docodonta
    mammal
    fossil
    Kyrgyzstan
    Jurassic mammal
    right ulna
    reptilian tooth
    mammalian incisor
    mammalian ulna
    sediment
    Mesozoic mammal
    Źródło:
    Acta Palaeontologica Polonica; 1994, 39, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Professor Andrzej K. Tarkowski (1933-2016) – pioneer of mammalian experimental embryology
    Autorzy:
    Maleszewski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/702984.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mammalian embryo
    isolated blastomeres
    mouse chimaeras
    parthenogenetic development
    nucleo-cytoplasmic interactions
    tetraploid embryos
    Opis:
    The article presents the main discoveries of Prof. Andrzej K. Tarkowski, which proved to be fundamental for modern mammalian developmental biology and also for progress in animal breeding and assisted reproduction. Among his achievements the most important are: the demonstration of regulative abilities of blastomeres isolated from early mammalian embryos, generation of first chimaeric mice, studies on mammalian parthenogenesis and establishment of blastomere electrofusion technique for production of tetraploid embryos. Studies on nucleo- cytoplasmic interactions in germ cells and early embryos contributed substantially to the development of mammalian cloning. Prof. Tarkowski’s work and discoveries provided a tremendous input to the contemporary developmental biology of mammals.
    Źródło:
    Nauka; 2017, 1
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specyfika rozwoju osobniczego Homo sapiens na tle ssaków łożyskowych i Naczelnych
    Some peculiarities in ontogeny of Homo sapiens comparing with mammalian and Primates growth
    Autorzy:
    Kozieł, Sławomir
    Siniarska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1817733.pdf
    Data publikacji:
    2004-12-31
    Wydawca:
    Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
    Tematy:
    ekologia człowieka
    rozwój osobniczy
    Homo sapiens
    ssaki łożyskowe
    naczelne
    human ecology
    ontogeny
    mammalian
    Primates
    Opis:
    During ontogeny, there are many phenomena that significantly differentiate humans from other mammals, including Primates. The present considerations and analysis of regression applied for many species to illustrate allometric relations of developmental spurts of height and weight to final values of these parameters in adults, allow to compare processes of growth of Homo sapiens with other Primates and to submit the following results: In Homo sapiens, the maximal rate of growth in length and body mass exists at the prenatal period (during gestation), and after birth, it decelerates. In the evolution of human ontogeny, two new stages occurred: The first one is „childhood" which is manifested by slow body growth and intense brain development. The second one is named „adolescence" and includes pubertal spurt of many body variables. In Humans, as compare with other Primates, the infancy and juvenile stages had been shortened. Human puberty begins when the postnatal rate of growth in height and weight is the lowest since birth and there is a considerable delay in puberty and sexual maturation than in other Primates. The adolescent growth spurt shortens the time needed to reach sexual maturity, which could have been much longer as the result of a slow growth that childhood. Sexual dimorphism in the intensity of pubertal spurt of body mass is smaller in Humans than in other Primates. On the contrary,  sexual dimorphism in the onset of puberty and growth rate in height at this stage is rather well manifested. The adolescent stage is divided into two parts because there is a delay of years between puberty and the onset of the adult reproductive stage of life.
    Źródło:
    Studia Ecologiae et Bioethicae; 2004, 2, 1; 89-106
    1733-1218
    Pojawia się w:
    Studia Ecologiae et Bioethicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolving morphogenetic fields in the zebra skin pattern based on Turings morphogen hypothesis
    Autorzy:
    Gravan, C. P.
    Lahoz-Beltra, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/907636.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole morfogenetyczne
    model reakcji-dyfuzji
    automat komórkowy
    mammalian coat pattern
    morphogenetic field
    Turing reaction-diffusion
    evolving cellular automata
    developmental models
    modeling biological structures
    Opis:
    One of the classical problems of morphogenesis is to explain how patterns of different animals evolved resulting in a consolidated and stable pattern generation after generation. In this paper we simulated the evolution of two hypothetical morphogens, or proteins, that diffuse across a grid modeling the zebra skin pattern in an embryonic state, composed of pigmented and nonpigmented cells. The simulation experiments were carried out applying a genetic algorithm to the Young cellular automaton: a discrete version of the reaction-diffusion equations proposed by Turing in 1952. In the simulation experiments we searched for proper parameter values of two hypothetical proteins playing the role of activator and inhibitor morphogens. Our results show that on molecular and cellular levels recombination is the genetic mechanism that plays the key role in morphogen evolution, obtaining similar results in the presence or absence of mutation. However, spot patterns appear more often than stripe patterns on the simulated skin of zebras. Even when simulation results are consistent with the general picture of pattern modeling and simulation based on the Turing reaction-diffusion, we conclude that the stripe pattern of zebras may be a result of other biological features (i.e., genetic interactions, the Kipling hypothesis) not included in the present model.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 351-361
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New mammalian remains from the Late Cretaceous La Colonia Formation, Patagonia, Argentina
    Autorzy:
    Rougier, G W
    Forasiepi, A.M.
    Hill, R.V.
    Novacek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21844.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    mammalian remains
    Late Cretaceous
    La Colonia Formation
    Patagonia
    Argentina
    mammal fauna
    Los Alamitos
    Coloniatherium cilinskii
    Vincelestes
    Mammalia
    Mesungulatidae
    Cretaceous
    new remains
    Campanian
    Maastrichtian
    Opis:
    Knowledge of the latest Late Cretaceous mammalian fauna in the South America was, until now, mostly based on dentally known taxa recovered at Los Alamitos (Río Negro, Argentina). Here we describe new mammalian remains collected in outcrops of the La Colonia Formation (Campanian–Maastrichtian) exposed in Chubut Province, Argentina, warranting the recognition of a new mesungulatid: Coloniatherium cilinskii gen. et sp. nov. The mammalian high−level taxonomic compositions of the localities in the La Colonia Formation and at Los Alamitos are roughly similar (Reigitheriidae, Mesungulatidae, and Ferugliotheridae are represented in both localities), but gondwanatheriids and the more plesiomorphic dryolestoids from Los Alamitos are missing from La Colonia. The most abundant mammalian remains collected at La Colonia correspond to large−sized mesungulatids. Coloniatherium cilinskii is recognized by the dentition and lower jaw, and we assign five isolated petrosal bones, focusing our study primarily on the analysis of the ear regions. The morphology of the petrosals suggests a phylogenetic position similar to Vincelestes, but sharing some derived features, possibly convergent, with therians. Attribution of the petrosals to the mesungulatid Coloniatherium cilinskii is supported by overall morphology, size, and relative abundance among the mammalian remains from La Colonia.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 2; 195-212
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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