<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sánchez del Pulgar, J</style></author><author><style face="normal" font="default" size="100%">Soukoulis, C</style></author><author><style face="normal" font="default" size="100%">Carrapiso, A I</style></author><author><style face="normal" font="default" size="100%">Cappellin, L</style></author><author><style face="normal" font="default" size="100%">Granitto, P</style></author><author><style face="normal" font="default" size="100%">Aprea, E</style></author><author><style face="normal" font="default" size="100%">Romano, A</style></author><author><style face="normal" font="default" size="100%">Gasperi, F</style></author><author><style face="normal" font="default" size="100%">Biasioli, F</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Effect of the pig rearing system on the final volatile profile of Iberian dry-cured ham as detected by PTR-ToF-MS</style></title><secondary-title><style face="normal" font="default" size="100%">Meat Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">aldehydes</style></keyword><keyword><style  face="normal" font="default" size="100%">Aldehydes: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Animal Feed</style></keyword><keyword><style  face="normal" font="default" size="100%">Animal Husbandry</style></keyword><keyword><style  face="normal" font="default" size="100%">Animal Husbandry: methods</style></keyword><keyword><style  face="normal" font="default" size="100%">Animals</style></keyword><keyword><style  face="normal" font="default" size="100%">diet</style></keyword><keyword><style  face="normal" font="default" size="100%">Dietary Fats</style></keyword><keyword><style  face="normal" font="default" size="100%">Dietary Fats: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Dietary Fats: pharmacology</style></keyword><keyword><style  face="normal" font="default" size="100%">Dry cured ham</style></keyword><keyword><style  face="normal" font="default" size="100%">Ions</style></keyword><keyword><style  face="normal" font="default" size="100%">Ketones</style></keyword><keyword><style  face="normal" font="default" size="100%">Ketones: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Mass spectrometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Mass Spectrometry: methods</style></keyword><keyword><style  face="normal" font="default" size="100%">meat</style></keyword><keyword><style  face="normal" font="default" size="100%">Meat: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Nuts</style></keyword><keyword><style  face="normal" font="default" size="100%">Oleic Acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Oleic Acid: pharmacology</style></keyword><keyword><style  face="normal" font="default" size="100%">Poaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Proton transfer reaction mass spectrometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus</style></keyword><keyword><style  face="normal" font="default" size="100%">Rearing system</style></keyword><keyword><style  face="normal" font="default" size="100%">subcutaneous fat</style></keyword><keyword><style  face="normal" font="default" size="100%">Subcutaneous Fat: metabolism</style></keyword><keyword><style  face="normal" font="default" size="100%">Sulfur Compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Sulfur Compounds: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Swine</style></keyword><keyword><style  face="normal" font="default" size="100%">Switchable reagent ions</style></keyword><keyword><style  face="normal" font="default" size="100%">Time of flight</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds: analysis</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier Ltd</style></publisher><volume><style face="normal" font="default" size="100%">93</style></volume><pages><style face="normal" font="default" size="100%">420-428</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The volatile compound proﬁle of dry-cured Iberian ham lean and subcutaneous fat from pigs fattened outdoors on acorn and pasture (Montanera) or on high-oleic concentrated feed (Campo) was investigated by proton transfer reaction time-of-ﬂight mass spectrometry. In addition to the usual proton transfer ionization the novel switchable reagent ions system was implemented which allows the use of different precursor ions (H3O+ , NO+ and O2 + ). The analysis of the lean and subcutaneous fat volatile compounds allowed a good sample discrimination according to the diet. Differences were evident for several classes of compounds: in particular, Montanera hams showed higher concentrations of aldehydes and ketones and lower concentrations of sulfur-containing compounds compared to Campo hams. The use of NO+ as precursor ion conﬁrmed the results obtained with H3O+ in terms of classiﬁcation capability and provides additional analytical insights.</style></abstract><accession-num><style face="normal" font="default" size="100%">23273445</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Del Pulgar, José Sánchez</style></author><author><style face="normal" font="default" size="100%">Soukoulis, Christos</style></author><author><style face="normal" font="default" size="100%">Biasioli, Franco</style></author><author><style face="normal" font="default" size="100%">Cappellin, Luca</style></author><author><style face="normal" font="default" size="100%">García, Carmen</style></author><author><style face="normal" font="default" size="100%">Gasperi, Flavia</style></author><author><style face="normal" font="default" size="100%">Granitto, Pablo</style></author><author><style face="normal" font="default" size="100%">Märk, Tilmann D.</style></author><author><style face="normal" font="default" size="100%">Piasentier, Edi</style></author><author><style face="normal" font="default" size="100%">Schuhfried, Erna</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Rapid characterization of dry cured ham produced following different PDOs by proton transfer reaction time of flight mass spectrometry (PTR-ToF-MS).</style></title><secondary-title><style face="normal" font="default" size="100%">Talanta</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Animals</style></keyword><keyword><style  face="normal" font="default" size="100%">Data Mining</style></keyword><keyword><style  face="normal" font="default" size="100%">Dry cured ham</style></keyword><keyword><style  face="normal" font="default" size="100%">Flavour compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Food Handling</style></keyword><keyword><style  face="normal" font="default" size="100%">Food Handling: methods</style></keyword><keyword><style  face="normal" font="default" size="100%">Italy</style></keyword><keyword><style  face="normal" font="default" size="100%">Mass spectrometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Mass Spectrometry: methods</style></keyword><keyword><style  face="normal" font="default" size="100%">Meat Products</style></keyword><keyword><style  face="normal" font="default" size="100%">Meat Products: analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">PDO</style></keyword><keyword><style  face="normal" font="default" size="100%">PTR-MS</style></keyword><keyword><style  face="normal" font="default" size="100%">PTR-ToF-MS</style></keyword><keyword><style  face="normal" font="default" size="100%">Spain</style></keyword><keyword><style  face="normal" font="default" size="100%">Swine</style></keyword><keyword><style  face="normal" font="default" size="100%">volatile compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2011///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/21645714</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">85</style></volume><pages><style face="normal" font="default" size="100%">386 - 393</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In the present study, the recently developed proton transfer reaction time of flight mass spectrometry (PTR-ToF-MS) technique was used for the rapid characterization of dry cured hams produced according to 4 of the most important Protected Designations of Origin (PDOs): an Iberian one (Dehesa de Extremadura) and three Italian ones (Prosciutto di San Daniele, Prosciutto di Parma and Prosciutto Toscano). In total, the headspace composition and respective concentration for nine Spanish and 37 Italian dry cured ham samples were analyzed by direct injection without any pre-treatment or pre-concentration. Firstly, we show that the rapid PTR-ToF-MS fingerprinting in conjunction with chemometrics (Principal Components Analysis) indicates a good separation of the dry cured ham samples according to their production process and that it is possible to set up, using data mining methods, classification models with a high success rate in cross validation. Secondly, we exploited the higher mass resolution of the new PTR-ToF-MS, as compared with standard quadrupole based versions, for the identification of the exact sum formula of the mass spectrometric peaks providing analytical information on the observed differences. The work indicates that PTR-ToF-MS can be used as a rapid method for the identification of differences among dry cured hams produced following the indications of different PDOs and that it provides information on some of the major volatile compounds and their link with the implemented manufacturing practices such as rearing system, salting and curing process, manufacturing practices that seem to strongly affect the final volatile organic profile and thus the perceived quality of dry cured ham.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;accession-num: 21645714</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kesselmeier, J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Exchange of short-chain oxygenated volatile organic compounds (VOCs) between plants and the atmosphere: A compilation of field and laboratory studies</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Atmospheric Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Acetaldehyde</style></keyword><keyword><style  face="normal" font="default" size="100%">acetic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">biogenic deposition</style></keyword><keyword><style  face="normal" font="default" size="100%">Biogenic emission</style></keyword><keyword><style  face="normal" font="default" size="100%">carbonyls</style></keyword><keyword><style  face="normal" font="default" size="100%">compensation point</style></keyword><keyword><style  face="normal" font="default" size="100%">Formaldehyde</style></keyword><keyword><style  face="normal" font="default" size="100%">formic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">organic acids</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><volume><style face="normal" font="default" size="100%">39</style></volume><pages><style face="normal" font="default" size="100%">219-233</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Field and laboratory investigations of the exchange of the short-chain organic acids – formic acid and acetic acid – as well as their homologous aldehydes are discussed. Both acids are substantially released from several plant species. Emission measurements under ﬁeld conditions are compiled to give an overview of three years of measurements. Emission rates from several tree species were found in the range between zero and 60 nmoles m−2 min−1 for acetic acid and between zero and 90 nmoles m−2 min−1 for formic acid though also a deposition has been observed to orange trees. Investigations under laboratory conditions showed an order of magnitude lower emission rates with signiﬁcant differences under light and dark conditions, and a deposition was observed under certain conditions. Hence, low emission rates or even a bi-directional exchange, emission as well as deposition have to be taken into account. Further differences between ﬁeld and laboratory studies are discussed considering age of trees, stress effects and a potential production of acids by photochemical conversion of precursors inside enclosures during sampling. Field data on the exchange of formand acetaldehyde show a complex behavior. We found emission as well as uptake. The bi-directional exchange is signiﬁcantly triggered by the ambient mixing ratios of both aldehyde species and exhibits a compensation point. Further studies are needed for generalization of the exchange of these and potentially also for other compounds</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kesselmeier, J</style></author><author><style face="normal" font="default" size="100%">Staudt, M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Biogenic volatile organic compounds (VOC): An overview on emission, physiology and ecology</style></title><secondary-title><style face="normal" font="default" size="100%">JOURNAL OF ATMOSPHERIC CHEMISTRY</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">acids</style></keyword><keyword><style  face="normal" font="default" size="100%">alkanes</style></keyword><keyword><style  face="normal" font="default" size="100%">alkenes</style></keyword><keyword><style  face="normal" font="default" size="100%">carbonyls</style></keyword><keyword><style  face="normal" font="default" size="100%">ecology</style></keyword><keyword><style  face="normal" font="default" size="100%">emission</style></keyword><keyword><style  face="normal" font="default" size="100%">emission inventories</style></keyword><keyword><style  face="normal" font="default" size="100%">Esters</style></keyword><keyword><style  face="normal" font="default" size="100%">isoprene</style></keyword><keyword><style  face="normal" font="default" size="100%">nonmethane hydrocarbons</style></keyword><keyword><style  face="normal" font="default" size="100%">oxygenated compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">physiology</style></keyword><keyword><style  face="normal" font="default" size="100%">review</style></keyword><keyword><style  face="normal" font="default" size="100%">terpenes</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><publisher><style face="normal" font="default" size="100%">SPRINGER</style></publisher><pub-location><style face="normal" font="default" size="100%">VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS</style></pub-location><volume><style face="normal" font="default" size="100%">33</style></volume><pages><style face="normal" font="default" size="100%">23-88</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">This overview compiles the actual knowledge of the biogenic emissions of some volatile organic compounds (VOCs), i.e., isoprene, terpenes, alkanes, alkenes, alcohols, esters, carbonyls, and acids. We discuss VOC biosynthesis, emission inventories, relations between emission and plant physiology as well as temperature and radiation, and ecophysiological functions. For isoprene and monoterpenes, an extended summary of standard emission factors, with data related to the plant genus and species, is included. The data compilation shows that we have quite a substantial knowledge of the emission of isoprene and monoterpenes, including emission rates, emission regulation, and biosynthesis. The situation is worse in the case of numerous other compounds (other VOCs or OVOCs) being emitted by the biosphere. This is reflected in the insufficient knowledge of emission rates and biological functions. Except for the terpenoids, only a limited number of studies of OVOCs are available; data are summarized for alkanes, alkenes, carbonyls, alcohols, acids, and esters. In addition to closing these gaps of knowledge, one of the major objectives for future VOC research is improving our knowledge of the fate of organic carbon in the atmosphere, ending up in oxidation products and/or as aerosol particles.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Simpson, D</style></author><author><style face="normal" font="default" size="100%">Winiwarter, W</style></author><author><style face="normal" font="default" size="100%">Borjesson, G</style></author><author><style face="normal" font="default" size="100%">Cinderby, S</style></author><author><style face="normal" font="default" size="100%">Ferreiro, A</style></author><author><style face="normal" font="default" size="100%">Guenther, A</style></author><author><style face="normal" font="default" size="100%">Hewitt, C N</style></author><author><style face="normal" font="default" size="100%">Janson, R</style></author><author><style face="normal" font="default" size="100%">Khalil, M A K</style></author><author><style face="normal" font="default" size="100%">Owen, S</style></author><author><style face="normal" font="default" size="100%">Pierce, T E</style></author><author><style face="normal" font="default" size="100%">Puxbaum, H</style></author><author><style face="normal" font="default" size="100%">Shearer, M</style></author><author><style face="normal" font="default" size="100%">Skiba, U</style></author><author><style face="normal" font="default" size="100%">Steinbrecher, R</style></author><author><style face="normal" font="default" size="100%">Tarrason, L</style></author><author><style face="normal" font="default" size="100%">Oquist, M G</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Inventorying emissions from nature in Europe</style></title><secondary-title><style face="normal" font="default" size="100%">JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">land use</style></keyword><keyword><style  face="normal" font="default" size="100%">NOx</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><publisher><style face="normal" font="default" size="100%">AMER GEOPHYSICAL UNION</style></publisher><pub-location><style face="normal" font="default" size="100%">2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA</style></pub-location><volume><style face="normal" font="default" size="100%">104</style></volume><pages><style face="normal" font="default" size="100%">8113-8152</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">As part of the work of the Economic Commission for Europe of the United Nations Task Force on Emission Inventories, a new set of guidelines has been developed for assessing the emissions of sulphur, nitrogen oxides, NH,, CH,, and nonmethane volatile organic compounds (NMVOC) from biogenic and other natural sources in Europe. This paper gives the background to these guidelines, describes the sources, and gives our recommended methodologies for estimating emissions. We have assembled land use and other statistics from European or national compilations and present emission estimates for the various natural/biogenic source categories based on these. Total emissions from nature derived here amount to similar to 1.1 Tg S yr(-1), 6-8 Tg CH4 yr(-1), 70 Gg NH3 (as N) yr(-1), and 13 Tg NMVOC yr(-1). Estimates of biogenic NOx emissions cover a wide range, from 140 to 1500 Gg NOx (as N) yr(-1). In terms of relative contribution to total European emissions for different pollutants, then NMVOC from forests and vegetation are clearly the most important emissions source. Biogenic NOx emissions (although heavily influenced by nitrogen inputs from anthropogenic activities) are very important if the higher estimates are reliable. CH, from wetlands and sulphur from volcanoes are also significant emissions in the European budgets. On a global scale, European biogenic emissions are not significant, a consequence of the climate and size (7% of global land area) of Europe and of the destruction of natural ecosystems since prehistoric times. However, for assessing local budgets and for photochemical oxidant modeling, natural/biogenic emissions can play an important role. The most important contributor in this regard is undoubtedly forest VOC emissions, although this paper also indicates that NMVOC emissions from nonforested areas also need to be further evaluated. This paper was originally conceived as a contribution to the collection of papers arising as a result of the Workshop on Biogenic Hydrocarbons in the Atmospheric Boundary Layer, August 24-27, 1997. (Several papers arising from this workshop have been published in Journal of Geophysical Research, 103(D19) 1998.).</style></abstract><notes><style face="normal" font="default" size="100%">APS</style></notes><research-notes><style face="normal" font="default" size="100%">APS</style></research-notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Penuelas, J</style></author><author><style face="normal" font="default" size="100%">Llusia, J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Influence of intra-and inter-specific interference on terpene emission by Pinus halepensis and Quercus ilex seedlings</style></title><secondary-title><style face="normal" font="default" size="100%">Biologia plantarum</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">a-pinene</style></keyword><keyword><style  face="normal" font="default" size="100%">Allelopathy</style></keyword><keyword><style  face="normal" font="default" size="100%">autopathy</style></keyword><keyword><style  face="normal" font="default" size="100%">camphene</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><volume><style face="normal" font="default" size="100%">41</style></volume><pages><style face="normal" font="default" size="100%">139-143</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Seedlings of two common Mediterranean trees, Pinus halepensis L. and Quercus ilex L., were grown alone and together with seedlings of the same or of the other species in the same pot during one year to test the effects of intra- and inter-specific interference on terpene emission. Light, nutrients and water were amply supplied. There were higher emission rates in P. halepensis than in Q. ilex. The emission increased when the neighbour was a pine and decreased when the neighbour was a holm oak. Volatile organic compound and terpene emission rates followed inverse trends to foliar biomass or growth, which decreased when the neighbour was a pine.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kesselmeier, J</style></author><author><style face="normal" font="default" size="100%">Bode, K</style></author><author><style face="normal" font="default" size="100%">Hofmann, U</style></author><author><style face="normal" font="default" size="100%">Mtjller, H</style></author><author><style face="normal" font="default" size="100%">Schafer, L</style></author><author><style face="normal" font="default" size="100%">Wolf, A</style></author><author><style face="normal" font="default" size="100%">Ciccioli, P</style></author><author><style face="normal" font="default" size="100%">Cecinato, A</style></author><author><style face="normal" font="default" size="100%">Frattoni, M</style></author><author><style face="normal" font="default" size="100%">Foster, P</style></author><author><style face="normal" font="default" size="100%">Dutaur, L</style></author><author><style face="normal" font="default" size="100%">Torreq, L</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">EMISSION OF SHORT CHAINED ORGANIC ACIDS , ALDEHYDES AND MONOTERPENES FROM QUERCUS ILEX L . AND PINUS PINEA L . IN RELATION TO PHYSIOLOGICAL ACTIVITIES , CARBON BUDGET AND EMISSION ALGORITHMS</style></title><secondary-title><style face="normal" font="default" size="100%">Atmospheric Environment</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">aldehydes</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon budget</style></keyword><keyword><style  face="normal" font="default" size="100%">coniferous</style></keyword><keyword><style  face="normal" font="default" size="100%">deciduous</style></keyword><keyword><style  face="normal" font="default" size="100%">light</style></keyword><keyword><style  face="normal" font="default" size="100%">Monoterpenes</style></keyword><keyword><style  face="normal" font="default" size="100%">oak</style></keyword><keyword><style  face="normal" font="default" size="100%">organic acids</style></keyword><keyword><style  face="normal" font="default" size="100%">pine</style></keyword><keyword><style  face="normal" font="default" size="100%">Pinus pinea L</style></keyword><keyword><style  face="normal" font="default" size="100%">Plant physiology</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex L</style></keyword><keyword><style  face="normal" font="default" size="100%">Temperature</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile Organic Compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><volume><style face="normal" font="default" size="100%">31</style></volume><pages><style face="normal" font="default" size="100%">119-133</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We report on the emission of monoterpenes, short-chained organic acids and aldehydes from Mediterranean oak (Quercus ilex L.) and pine (Pinus pinea L.). All studies were done with dynamic cuvettes enclosing intact branches at the top of the canopy flushed with ambient air. Daily trends are compared with the photosynthetic active radiation (PAR), leaf temperature and the physiological activities of the enclosed branches, i.e. assimilation and transpiration, with special attention on the carbon budget. Oak emits monoterpenes in high amounts, up to 2% of the assimilated carbon. As compared with monoterpenes, short-chained organic acids and aldehydes are of minor importance for oak. However, on a leaf dry-weight basis equal amounts of acids and aldehydes are released from oak and pine. As pine emitted only low amounts of terpenes (below 0.2% of the assimilated carbon) the release of terpenes and oxygenated compounds is of equal importance for this species. A comparison of a modelled light and temperature driven emission with the observed volatile organic compounds (VOC) emissions showed good agreement for monoterpenes as well as for organic acids emitted in the case of oak. For pine only the release of acids showed an adequate relation to the algorithm data, whereas the terpene emissions seemed to be dominated by temperature effects</style></abstract></record></records></xml>