Search results for "BARD"
showing 10 items of 208 documents
Structure elucidation of the adducts formed by fjord region Dibenzo[a,l]pyrene-11,12-dihydrodiol 13,14-epoxides with deoxyguanosine.
1999
Model adducts to be used in the identification of biologically formed adducts were synthesized by reaction of fjord-region dibenzo[a,l]pyrene 11,12-dihydrodiol 13,14-epoxides (DB[a,l]PDE) and deoxyadenosine (dA). The (+/-)-anti-DB[a,l]PDE was reacted with dA in dimethylformamide at 100 degrees C for 30 min to give four DB[a, l]PDE-14-N(6)dA adducts: (-)-anti-trans (26%), (+)-anti-trans (26%), (-)-anti-cis (17%), and (+)-anti-cis (17%). The (+/-)-syn-DB[a,l]PDE was reacted with dA under the same conditions to yield four DB[a, l]PDE-14-N(6)dA adducts and one N7Ade adduct: (+)-syn-cis (19%), (+)-syn-trans (13%), (-)-syn-cis (19%), (-)-syn-trans (13%), and (+/-)-syn-DB[a,l]PDE-14-N7Ade (22%). T…
Data from: Ecological impact assessments of alien species in Norway
2020
Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in local biodiversity and ecosystem functioning, and, ultimately, to biotic homogenisation. We risk-assessed all alien plants, animals, fungi and algae, within certain delimitations, that are known to reproduce in Norway. Mainland Norway and the Arctic archipelago of Svalbard plus Jan Mayen were treated as separate assessment areas. Assessments followed the Generic Ecological Impact Assessment of Alien Species (GEIAA) protocol, which uses a fully quantitative set of criteria. A tot…
Contributions of statistical modelling for the understanding of the nivo-glaciological dynamics of a small arctic glacial basin (Austre Lovén glacier…
2021
Since the middle of the 19th century, the Earth has experienced a climate shift marked by a high rise in temperature (+ 0.85 °C over the period 1880-2012). The Arctic is the region of the world that is warming the most rapidly, at a rate of 2 to 3 times faster than the global average. In this context, all components of the Arctic cryosphere are experiencing a change in their dynamics. Because of their direct links with the atmosphere, glaciers are among the best indicators of these climate variations. Like other glaciers on the globe, the glaciers of Svalbard, which cover 60% of the archipelago’s surface, have been retreating since the end of the Little Ice Age. This retreat, which is refle…
Distribution de la température et de la végétation en Baie du Rois, Svalbard (79°), mise en place d'une approche spatiale formalisée
2006
International audience; Le changement climatique est un problème majeur, surtout en Arctique. Ce constat global doit être précisé afin d'appréhender les conséquences du phénomène car son impact se module dans l'espace selon les caractéristiques propres à chaque milieu. L'aire d'étude est située au Svalbard où des données, de différentes sources, sont collectées sur le terrain. Elles sont ensuite traitées au sein d'un système d'information géographique afin de modéliser les variations spatiales à grande échelle de la température et de la végétation.
Distribution de la végétation au Svalbard
2016
International audience
Life history of an Arctic crustacean Onisimus caricus (Amphipoda: Lysianassidae) as deduced from baited trap samples taken from Adventfjorden, Svalba…
2008
A 5500-year oxygen isotope record of high arctic environmental change from southern Spitsbergen
2017
The oxygen isotope composition of chironomid head capsules in a sediment core spanning the past 5500 years from Lake Svartvatnet in southern Spitsbergen was used to reconstruct the oxygen isotope composition of lake water (δ18Olw) and local precipitation. The δ18Olw values display shifts from the baseline variability consistent with the timing of recognized historical climatic episodes, such as the Roman Warm Period, the Dark Ages Cold Period and the ‘Little Ice Age’. The highest values of the record, ca. 3‰ above modern δ18Olw values, occur at ca. 1900–1800 cal. yr BP. Three negative excursions increasing in intensity toward the present, at 3400–3200, 1250–1100, and 350–50 cal. yr BP, are…
Controuersiarum theologicarum inter S. Thomam, et Scotum ... / Auctore ... Ioannes de Rada ... Ordinis S. Francisci Regulari Obseruantia ...
1604
Sig. +-+++4, A-Ll8, Mm7 Port. a dues tintes. - text a dues col. - Errates en la pag.
Más cerca del caos
2001
Gada koka 2020 – Eiropas dižskābarža – herbārijs
2020
Latvijas Dendrologu biedrība (LDB) par 2020. gada koku izvēlējās Eiropas dižskābardi Fagus sylvatica L. Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekciju herbārijā glabājas arī šīs sugas pārstāvju herbārijs - žāvēti un presēti zariņi ar lapām. Rakstā ir Eiropas dižskābarža sugas apraksts un 5 attēli no LU Muzeja herbārija, ar informāciju par to ievākšanas vietām un laikiem.