Search results for "FOSS"
showing 10 items of 556 documents
The Energy Market Impact of Climate Change on Electricity Generation in Europe
2018
In this paper, the policy trend in Europe towards the emission reduction target in the energy sector, as planned from the Paris Agreement, is analyzed. Although renewable energy sources are improving their share, the large use of coal as primary fuel and the uncertainty about nuclear production makes the transition hard. It's well known that future emission patterns from energy generation influence the climate change trend, but as shown in the following, there is also a reverse interrelation, due to the different environmental conditions caused by climate change affecting all generation technologies. Furthermore, energy prices, which derive from this changed framework likewise will influenc…
The Gravettian occipital bone from the site of Malladetes (Barx, Valencia, Spain)
2002
Abstract The juvenile occipital bone from the site of Malladetes in Valencia (Spain) is described and compared with other European Pleistocene representatives of the genus Homo . This specimen derives from a Gravettian cultural context and has been AMS radiocarbon-dated to 25,120±240 years bp . As such, it provides evidence on early modern human anatomy from the Central Mediterranean region of the Iberian peninsula. The clear evidence for a late survival of Neandertals in southern Iberia, has led to considerable debate surrounding the biological and cultural interactions between these Pleistocene humans and their early modern human successors, and it is within this context that the Malladet…
Neurilemoma of the tibial nerve in the popliteal fossa A case report
1993
We report a case of a 61 year old man who had a history of 4 years right leg pain. Clinical and radiological examination and MRI revealed a soft tissue mass in the popliteal fossa. A neurilemoma of the tibial nerve was confirmed after removal of the tumor and histological examination. To our knowledge this is the first case of a neurilemoma located in the tibial nerve reported in the literature.
Subfossil chironomid assemblages in deep, stratified European lakes: relationships with temperature, trophic state and oxygen
2010
Summary 1. The distributions of subfossil remains of chironomid larvae in 28 large, deep and stratified lakes in Europe were examined in surface sediments along a latitudinal transect ranging from northern Sweden to southern Italy. 2. Canonical correspondence analysis (CCA) showed that summer surface water and July air temperature, as well as total phosphorus (TP) concentrations, hypolimnetic oxygen availability and conductivity were statistically significant (P < 0.05) explanatory variables explaining between 11 and 14% of the variance in the chironomid data. 3. Owing to the spatial scale covered by our study, many environmental variables were covarying. Temperature, TP concentration and o…
Hermé (Seine-et-Marne), Carrière SPM-Synéos d'Hermé : Tranche 7 des diagnostics archéologiques : rapport de diagnostic
2021
L’opération archéologique menée à Hermé, carrière Synéos (SPM) - tranche 6 des diagnostics archéologiques a permis de mettre au jour des occupations diachroniques néolithique et protohistorique.Ce diagnostic s’est déroulé sur deux parcelles distinctes pour une surface globale de 102 922 m2, une première au lieudit le Château Duduit et la seconde au lieudit La Patûre aux Bœufs.Sur l’emprise du Château Duduit nous avons mis au jour un petit amas de vingt-cinq pièces lithiques daté du Néolithique. Le diagnostic de 2022 a permis de mettre au jour une seule chaîne opératoire (débitage d’éclats par percussion dure) réalisée à partir de matériaux locaux pour la fabrication d’outils tels que les ra…
Melastomeae come full circle: biogeographic reconstruction and molecular clock dating.
2001
Rhexia, with 11 species in the Coastal Plain province of North America, is the only temperate zone endemic of the tropical eudicot family Melastomataceae. It is a member of the only pantropical tribe of that family, Melastomeae. Based on the chloroplast gene ndhF, we use a fossil-calibrated molecular clock to address the question of the geographic origin and age of Rhexia. Sequences from 37 species in 21 genera representing the tribe's geographical range were analyzed together with five outgroups. To obtain better clade support, another chloroplast region, the rpl16 intron, was added for 24 of the species. Parsimony analysis of the combined data and maximum-likelihood analysis of ndhF alone…
The holocene marine depositional event in the historical centre of palermo
2004
Studi recenti hanno indicato come al di sopra della classica sequenza del Quaternario marino della Piana di Palermo ricorra, in alcunisiti del Centro Storico, un limitato spessore di depositi marini di età post-tirreniana. Con lo scopo di precisare l’età di tali depositi sonostate studiate le associazioni di microfossili di campioni provenienti da sondaggi geognostici. Utilizzando lo schema ecobiozonale anannofossili calcarei recentemente proposto per l’ultima deglaciazione nel Mediterraneo centrale (Canale di Sicilia) detti depositi contengononannoflore attribuibili all’Olocene. Un'analisi al radiocarbonio ha confermato tale attribuzione, limitando alla parte bassadell'Olocene la pertinenz…
What Is Regional in Regional Clusters? The Case of the Globally Oriented Oil and Gas Cluster in Agder, Norway
2012
This paper focuses on the question to what extent knowledge sources in regional clusters stimulate the innovation activity of cluster firms. In doing so we contribute to the literature by combining two analytical approaches: by (1) distinguishing firms dominated by different innovation modes; and (2) differentiating between inter-organizational linkages and open knowledge environments as two distinct knowledge sources. Based on data from the Agder equipment supplier industry we demonstrate that mobility of labour, local buzz and inter-organizational linkages are key regional knowledge sources, but clearly more so for some types of firms than others.
Conservation of optical purity of amino acids: a principal problem in biochemical and proto-biochemical systems.
1981
Dor L-amino acids, regardless of their state (peptide-bound or free, in the solid state or in aqueous solution), tend to racemize. In a living cell this racemization is usually compensated by specific degradation and replacement of the unwanted polypeptides that contain the wrong enantiomers. But a few long-lived proteins that are synthesized at or near birth are never replaced. Well investigated is the racemization of L-aspartic acid at a rate of 0.1 to 1.14 per cent per year in proteins from lenses and dentine. Increased racemization of eye lens proteins has been related to a form of human eye disease known as brunescent cataracts. Also quite well investigated is the racemization of amino…
Fasciola hepatica phenotypic characterization in Andean human endemic areas: Valley versus altiplanic patterns analysed in liver flukes from sheep fr…
2011
Fascioliasis is a zoonotic parasitic disease caused by Fasciola hepatica and Fasciola gigantica. Of both species, F. hepatica is the only one described in the Americas, mainly transmitted by lymnaeid snail vectors of the Galba/. Fossaria group. Human fascioliasis endemic areas are mainly located in high altitude areas of Andean countries. Given the necessity to characterize F. hepatica populations involved, the phenotypic features of fasciolid adults infecting sheep present in human fascioliasis endemic areas were analysed in the Cajamarca Valley and Mantaro Valley (valley transmission patterns) and the northern Bolivian Altiplano (altiplanic transmission pattern). A computer image analysis…