Search results for "Univers"
showing 10 items of 6284 documents
Profesors Haralds Gode: biobibliogrāfiskais rādītājs
1988
Ķīmijas zinātņu doktora profesora H.Godes biobibliogrāfiskajā rādītājā apkopoti viņa publicēto darbu bibliogrāfiskie apraksti no 1946.g. līdz 1988.g., 4 nepublicētie darbi, kā arī uzrādīta literatūra par viņu.
Profesors Haralds Gode: personālais bibliogrāfiskais rādītājs
1978
Profesora Haralda Godes personālajā bibliogrāfiskajā rādītājā apkopoti viņa publicēto darbu bibliogrāfiskie apraksti no 1946.g. līdz 1973.g. (daļēji), Atsevišķās nodaļās izkārtoti profesora rediģētie un tulkotie darbi, viņa vadītās disertācijās, kā arī raksti par viņu.
Profesors Edgars Jansons: biobibliogrāfiskais rādītājs
1989
Saturs: Priekšvārds. Ķīmijas zinātņu doktors profesors Edgars Jansons / Rudzītis G. . E. Jansona publicētie darbi (1956. - 1989..) E. Jansona rediģētie un recenzētie darbi. E. Jansona vadītās disertācijas. E. Jansonam izsniegtās publicētās autorapliecības. Literatūra par E. Jansonu. E. Jansona publicēto darbu alfabētiskais rādītājs. Personu rādītājs.
Profesors Alfrēds Miltiņš: biobibliogrāfiskais rādītājs
2000
Biobibliogrāfiskajā rādītājā sniegts profesora Alfrēda Miltiņa dzīves un zinātniskās darbības pārskats un apkopoti visi profesora publicētie darbi (1965. g.- 2000. g.), kā arī publikācijas par viņu.
Iron isotope signature of magnetofossils and oceanic biogeochemical changes through the Middle Eocene Climatic Optimum.
2021
21 pages; International audience; Magnetotactic bacteria (MTB) intracellularly precipitate magnetite (Fe3O4) crystals that can be preserved in the geological record. When MTB die, the so-called magnetofossils constitute valuable proxies for paleoenvironmental reconstructions and are suspected to represent some of the oldest traces of biomineralization on Earth. Yet, the biogenicity of putative magnetofossils found in ancient terrestrial and extra-terrestrial samples is still largely debated and their significance for past climate still holds uncertainties. Here we studied a sedimentary sequence from the Indian Ocean (ODP Hole 711A) recording the Middle Eocene Climatic Optimum (MECO) through…
Storage and release of fossil organic carbon related to weathering of sedimentary rocks
2007
International audience; The biogeochemical carbon cycle, which plays an undeniable role in global climate change, is defined both by the size of carbon reservoirs (such as the atmosphere, biomass, soil and bedrock) and the exchange between them of various mineral and organic carbon forms. Among these carbon forms, fossil organic carbon (FOC) (i.e., the ancient organic matter stored in sedimentary rocks) is widely observed in modern environments but is not included in the supergene carbon budget. Using a digitized map of the world and an existing model of CO2 consumption associated with rock weathering, we establish the global distribution of FOC stored in the first meter of sedimentary rock…
Discurso leído en la solemne inauguración de curso de la Universidad Literaria de Valencia : (1901 a 1902) : [Notas histórico-naturales á propósito d…
1901
Climate variation during the Holocene influenced the skeletal properties of Chamelea gallina shells in the North Adriatic Sea (Italy)
2021
Understanding how marine taxa will respond to near-future climate changes is one of the main challenges for management of coastal ecosystem services. Ecological studies that investigate relationships between the environment and shell properties of commercially important marine species are commonly restricted to latitudinal gradients or small-scale laboratory experiments. This paper aimed to explore the variations in shell features and growth of the edible bivalve Chamelea gallina from the Holocene sedimentary succession to present-day thanatocoenosis of the Po Plain-Adriatic Sea system (Italy). Comparing the Holocene sub-fossil record to modern thanatocoenoses allowed obtaining an insight o…
Approches protéomiques en archéologie et héritage culturel : caractérisation de protéines anciennes préservées dans des coquilles de mollusques
2021
Archaeological mollusc shell artifacts and ecofacts are valuable sources to study past cultures and provide insights on how people exploited their environments. Mollusc shells were often used as raw materials to make personal ornaments and are abundantly found in archaeological sites. However, minute, heavily worked and/or fragmented shell ornaments are rarely identified at different taxonomic levels, due to limited availability of analytical approaches to determine taxon-specific (diagnostic) features. In recent years, proteomics, which exploits the high sensitivity of modern mass spectrometry techniques, has been successfully applied to the study of a variety of bioarchaeological remains,…
Biominéralisation chez les Céphalopodes (Mollusca) : processus moléculaires et évolution
2021
Molluscs constitute one of the most diversified phyla within metazoans, known for their ability to mineralize a shell. The shell biomineralization is a genetically controlled process that is performed extracellularly via a calcifying organic matrix. This latter, which remains finally occluded (at least, partially) into the shell, is a mixture of proteins, glycoproteins, lipids and polysaccharides, that are collectively secreted by the external calcifying epithelium of the mantle. Today, the shell matrix is usually considered as the ‘molecular toolbox’ for constructing the shell. Since its discovery, it has been the focus of numerous studies, but mainly on bivalves and gastropods leaving cep…