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Tytuł:
An awkward contaminant: are mercury concentrations in historically collected fossils a result of storage conditions?
Autorzy:
Surmik, Dawid
Cabała, Jerzy
Balin, Katarzyna
Szade, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2055853.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
mercury
contamination
vertebrates
bones
Opis:
High concentrations of mercury (Hg), reaching astonishing values in two cases, have recently been detected in Middle and Late Triassic fossil reptile bones, housed for over 100 years in several Polish museum collections. Since no correlation between either the life modes of these taxa or their burial environment was observed, the studied contaminations seem to be associated with housing conditions. The specimens were kept for an extended amount of time in boxes, in which they were stored soon after finding. A proximity of mercury-containing materials, like mercury fulminate, and unstandardized conditions of storage and conservation of the remains may result in contamination of porous bone with mercury. A detailed knowledge about the housing history of old museum collections has great importance to their prospective studies.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 1; 39--49
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opportunities and constraints for reconstructing palaeoenvironments from stable light isotope ratios in fossils
Autorzy:
Lee-Thorp, J. A.
Sponheimer, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060629.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stable light isotopes
fossils
vertebrates
diagenesis
environmental reconstruction
Opis:
Stable light isotope ratios (13C/12C and 18O/16O) in fossilteeth provide key archives for understanding ecology of past faunal communities and the evolution of environments during the Plio-Pleistocene. Given the inevitable processes of diagenesis during fossilisation, the integrity of isotopic in formation and the degree of detailed in formation that can be extracted, remain important issues in all fossil studies. The most appropriate tests are those in trinsic to isotopic abundances in ecosystems. They are easier to develop for 13C/12C in savanna environments where large 13C/12C differences exist between C4 tropical grasses and C3 trees and shrubs. Validating 18O/16O ratios in fossil carbonate or phosphate is more difficult, but patterned variability, mainly tracking water-related behaviour, within modern faunal communities has been replicated in several fossil as semblages. The identification of seasonal variation in 13C/12C and 18O/16O along the growth axis of a tooth crown, also applicable in areas composed solely of C3 plants, fills a dual role as a test and for providing data on seasonal amplitude. The results of studies from low- and mid-latitude African sites suggest that isotopic variation in rain fall on short timescales and ecological differences amongst animals, dominate over smaller differences in 18O16O composition due to temperature.
Źródło:
Geological Quarterly; 2005, 49, 2; 195-204
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyjście kręgowców na ląd-zapis w dewonie Gór Świętokrzyskich
Vertebrates’ entrance on land-record in the Devonian of the Holy Cross Mountains
Autorzy:
Szrek, P.
Niedźwiedzki, G.
Powiązania:
https://bibliotekanauki.pl/articles/2066097.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
kręgowce
Góry Świętokrzyskie
vertebrates’
Holy Cross Mountains
Źródło:
Przegląd Geologiczny; 2008, 56, 11; 973-976
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fifty-year history of Early/Lower Vertebrates symposia - an overview
Autorzy:
Schultze, H.-P.
Powiązania:
https://bibliotekanauki.pl/articles/139020.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vertebrates
Paleozoic
meeting
proceedings
honors
kręgowce
paleozoik
spotkanie
obrady
Opis:
Fourteen symposia on early/lower vertebrates have taken place over the last 50 years, usually at about four year intervals. An average 60 participants have taken part at these symposia, with over one hundred occasionally. The results of the symposia have been published in proceedings. The symposia started honoring E. A:son Stensiö and E. Jarvik. Honors were taken up at the 11th symposium in Uppsala again. Since the 13th symposium a Stensiö award is also given to young researchers in the field.
Źródło:
Acta Geologica Polonica; 2018, 68, 3; 263-273
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental differentiation reflected in the vertebrate fauna diversity in the Lower Devonian of the Holy Cross Mountains, Poland
Autorzy:
Wilk, Olga
Szrek, Piotr
Ginter, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2201204.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
vertebrates
Lower Devonian
Emsian
Holy Cross Mountains
environment
Opis:
The Lower Devonian of the Holy Cross Mountains is well-known in the field of vertebrate palaeontology but remains unrecognized as regards palaeoenvironmental reconstructions. We therefore analysed the spatial distribution and relative abundance of fossil vertebrates in this area within one time interval. The fauna from an Early Devonian (Emsian) siliciclastic bone-bearing breccia (the “Placoderm Sandstone”) exposed in four sections of the Łysogóry region and five sections of the Kielce region was analysed with respect to the frequency of the remains and their taxonomic affinity. The relative abundances of agnathans, acanthodians, placoderms, osteichthyans and chondrichthyans suggest more open marine conditions in the Łysogóry region and more terrestrial-influenced in the Kielce region during the Emsian. The results show that the average agnathan and acanthodian content of the Łysogóry region is significantly larger than that in the Kielce region. On the other hand, there are relatively fewer osteichthyans in the Łysogóry region and a significantly higher proportion of bony fishes was recorded in the fauna of the Kielce region. Placoderms are characterized by their generally similar frequency in both regions and from site to site in each of them, though a greater abundance was noted from the Kielce region. Likewise differences in the proportions of particular groups in the Kielce region suggest a large variety of marginal-marine environments under the influence of factors that might have included marine currents and variable conditions around a river mouth.
Źródło:
Geological Quarterly; 2022, 66, 4; art. 66, no. 35
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Starzenie się i długość życia wybranych bezkręgowców i kręgowców
Aging and life span of selected invertebrates and vertebrates
Autorzy:
Boczek, Jan
Kiełkiewicz, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2055067.pdf
Data publikacji:
2016-12-20
Wydawca:
Centrum Doradztwa Rolniczego w Brwinowie. Oddział w Poznaniu
Tematy:
bezkręgowce
kręgowce
długość życia
invertebrates
vertebrates
length of life
Opis:
Na kuli ziemskiej, owady stanowią ponad 80% fauny. Opisano ponad milion gatunków owadów, których długość życia ogromnie się różni. Np. jętka żyje od kilku do 24 godzin, a królowa niektórych gatunków termitów nawet do 35 lat. Królowa mrówek Myrmecia vindex żyje 500 razy dłużej niż samce i co najmniej 10 razy dłużej niż robotnice, a przecież te kasty są genetycznie identyczne. Z kolei pszczoła miodna, w zależności od czynników środowiskowych może żyć od kilku tygodni do ponad 2 lat. Po wylęgu, każda pszczoła trudni się porządkami w ulu i wtedy jej śmiertelność jest mała. Natomiast w dalszym życiu wylatuje dla pożytku i wtedy jej śmiertelność wielokrotnie wzrasta, do czego przyczyniają się różne zdarzenia poza gniazdem. Generalnie, owady społeczne żyją zwykle dłużej, gdyż wzajemnie się chronią i często wspólnie bronią się przed drapieżcami.
On the globe, insects make up more than 80% of the fauna. Over a million insect species have been described, with life expectancy varying enormously. For example, a mayfly lives from several to 24 hours, and the queen of some termite species even up to 35 years. Queen ants Myrmecia vindex lives 500 times longer than males and at least 10 times longer than workers, yet these castes are genetically identical. Honey bees, on the other hand, may live from several weeks to over 2 years depending on environmental factors. After hatching, each bee deals with the cleaning of the hive and then its mortality is low. In the later life, however, it flies out for the benefit and then its mortality increases many times, which is due to various events outside the nest. In general, social insects tend to live longer because they protect each other and often defend themselves against predators together.
Źródło:
Zagadnienia Doradztwa Rolniczego; 2016, 86, 4; 94-103
1232-3578
2719-8901
Pojawia się w:
Zagadnienia Doradztwa Rolniczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowy zespół kręgowców z marginalnomorskich i lądowych osadów dolnego kajpru (ladyn, środkowy trias) z Miedar na Śląsku
New vertebrate assemblage from marginal-marine and land Lower Keuper strata (Ladinian, Middle Triassic) of Miedary, Silesia, SW Poland
Autorzy:
Sulej, T.
Niedźwiedzki, G.
Niedźwiedzki, R.
Surmik, D.
Stachacz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074868.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
kręgowce
trias środkowy
Kajpr
Śląsk
vertebrates
Middle Triassic
Keuper
Silesia
Opis:
Vertebrate remains, mostly nothosaurid vertebrae and long bones, archosaur partially preserved long bones and teeth (probably rauisuchid remains), fish teeth and scales, are described from the Lower Keuper Miedary Beds (Ladinian, Middle Triassic) of Miedary, Silesia, SW Poland. The analyzed vertebrate fossils were collected from three lithologically different types of deposits. The first assemblage, which contains nothosaurid and fish remains, occurs in yellowish dolomites, where poorly preseved invertebrate macrofossils were also found (marine bivalves and brachiopods). In grey-yellowish, sometimes greenish or red clays, rare isolated bones and teeth of large archosaur were found. In sandstone intercalations partially preserved and highly disarticulated fish fossils were identified. In all assemblages osteological remains are generally very well preserved. This new interesting vertebrate bones association from the upper part of the Middle Triassic marginal-marine strata of Poland has been correlated with age-equivalents from other regions of Europe.
Źródło:
Przegląd Geologiczny; 2011, 59, 5; 426-430
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular evolution of enolase
Autorzy:
Piast, Michał
Kustrzeba-Wójcicka, Irena
Matusiewicz, Małgorzata
Banaś, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/1041439.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
concerted evolution
gene duplication
"birth and death" evolution
glycolysis
vertebrates evolution
enolase
Opis:
Enolase (EC 4.2.1.11) is an enzyme of the glycolytic pathway catalyzing the dehydratation reaction of 2-phosphoglycerate. In vertebrates the enzyme exists in three isoforms: α, β and γ. The amino-acid and nucleotide sequences deposited in the GenBank and SwissProt databases were subjected to analysis using the following bioinformatic programs: ClustalX, GeneDoc, MEGA2 and S.I.F.T. (sort intolerant from tolerant). Phylogenetic trees of enolases created with the use of the MEGA2 program show evolutionary relationships and functional diversity of the three isoforms of enolase in vertebrates. On the basis of calculations and the phylogenetic trees it can be concluded that vertebrate enolase has evolved according to the "birth and death" model of evolution. An analysis of amino acid sequences of enolases: non-neuronal (NNE), neuron specific (NSE) and muscle specific (MSE) using the S.I.F.T. program indicated non-uniform number of possible substitutions. Tolerated substitutions occur most frequently in α-enolase, while the lowest number of substitutions has accumulated in γ-enolase, which may suggest that it is the most recently evolved isoenzyme of enolase in vertebrates.
Źródło:
Acta Biochimica Polonica; 2005, 52, 2; 507-513
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of Silurian fishes from north-western Hunan, China and related biostratigraphy
Autorzy:
Zhao, W. -J.
Zhu, M.
Gai, Z. -K.
Pan, Z. -H.
Cui, X. -D.
Cai, J. -C.
Powiązania:
https://bibliotekanauki.pl/articles/139181.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
early vertebrates
biostratigraphy
Silurian
north-western Hunan
China
kręgowce
biostratygrafia
sylur
Hunan
Chiny
Opis:
The Silurian fishes from north-western Hunan, China are characterised by the earliest known galeaspids Dayongaspis Pan and Zeng, 1985 and Konoceraspis Pan, 1992, and the earliest known antiarch Shimenolepis Wang J.-Q., 1991, as well as rich sinacanth fin spines. Shimenolepis from Lixian County in north-western Hunan, which was dated as the Telychian (late Llandovery), has long been regarded as the oldest representative of the placoderms in the world. As such, in addition to eastern Yunnan and the Lower Yangtze Region, north-western Hunan represents another important area in South China that yields important fossil material for the research of early vertebrates and related stratigraphy. Here we summarise the Silurian fishes known in north-western Hunan so far, and classify them into three vertebrate assemblages (i.e., the Wentang, Maoshan, and Yangtze assemblages). Based on the updated Silurian vertebrate and stratigraphic databases, the Silurian fish-bearing strata in north-western Hunan can be subdivided into the Rongxi, Huixingshao, and Xiaoxi formations in ascending chronological order, which can be correlated with the Lower Red Beds, the Upper Red Beds, and the Ludlow Red Beds in South China, respectively. A new look at the Silurian strata in Lixian suggests that the age of Shimenolepis is late Ludlow rather than late Llandovery as previously suggested. The research on Silurian fishes and biostratigraphy in north-western Hunan not only provides morphological data of early vertebrates, but also offers new palaeoichthyological evidence for the subdivision, correlation, and age assignment of the Silurian marine red beds in South China. The establishment of a related high-precision Silurian stratigraphic framework in north-western Hunan will help to elucidate the temporal and spatial distribution of Silurian fossil fishes, deepen the understanding of the evolution of early vertebrates, and unravel the coevolution between Silurian vertebrates and the palaeoenvironment.
Źródło:
Acta Geologica Polonica; 2018, 68, 3; 475-486
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reasoning by SVD and Morphotronic Network
Autorzy:
Chaczko, Z.
Resconi, G.
Powiązania:
https://bibliotekanauki.pl/articles/226465.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
immune system
vertebrates
immune-computing(IC)
Morphotronic System
immune memory
antigen
dangerous cell
Opis:
The immune system of the vertebrates possess the capabilities of “intelligent” information processing, which include memory, the ability to learn, to recognize, and to make decisions with respect to unknown situations. The mathematical formalization of these capabilities forms the basis of immune-computing (IC) as a new computing approach that replicates the principles of information processing by proteins and immune networks. This IC approach looks rather constructive as a basis for a new kind of computing. With the Morphotronic System or the analogous SVD we can create effective learning process and create immune memory by the projection operators. Given the immune memory is possible to recognize and compare antigen in a way to take defense action to eliminate the dangerous cell.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 2; 145-152
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 14

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