102,275 research outputs found
Foreste urbane e servizi ecosistemici: abbattimento del particolato aerodisperso (PM10) e tipologia di vegetazione, in contesto urbano e periurbano nell’area metropolitana di Roma
No full textUrban ecosystem services: tree diversity and stability of PM10 removal in the metropolitan area of Rome
No full textUrban vegetation, and particularly urban forests, are known to provide important ecosystem services, such as urban air quality improvement by removing gaseous and particulate pollutants. The amount of PM10 removed by urban and periurban trees of the metropolitan area of Rome (evergreen broadleaves, deciduous broadleaves and conifers) was estimated by considering the minimum and maximum PM10 concentration values recorded in the Municipality of Rome during the years 2003 and 2004. The results of these simulations have been used to map the Ecosystem Service of PM10 removal by the three functional groups in the five Sanitary Districts of the Municipality. Given the spatial uniformity of PM10 levels in the urban area, the highest amount of PM10 deposition rates, during the whole period, are those of the Sanitary District with the largest vegetation cover (RMD). It is also interesting to highlight that the highest deposition fluxes, for the three functional groups, were estimated for the 2004 summer period, in concurrence with the highest mean values of Leaf Area Index. Our results confirm the crucial role of vegetation in supporting significant Ecosystem Services as air quality improvement, highlighting the importance of biodiversity and green infrastructures of sustain and enhance benefits provided by trees
Alcohol abuse: An under-estimated risk factor for hypertension. A review.
No full textWhile the effects of alcohol on blood pressure have been widely investigated, this effect of alcohol is commonly underestimated in current clinical practice, since it is shadowed by the decreased vascular resistance in alcoholic cirrhosis. Thus. the most significant studies are reviewed here. Indeed, the potential mechanisms of alcohol-induced hypertension (sympathetic system activation, CHR release) are discussed, as well as the relationship between hypertension and alcohol withdrawal. The debated matter of the relationship between alcohol intake, heart diseases, stroke and hypertension is discussed, and a cautious approach is suggested, as the alleged protective effects of "safe" drinking on coronary heart disease may be counterbalanced by the induction of alcohol-dependence. Thus, drinking should not be suggested to abstinent people
Ecophysiological characterization of Citrus sinensis (L.) Osbeck and relationships with type and amount of biogenic emissions
No full textIn this paper are shown the results obtained on Citrus sinensis (L.) Osbeck during the sampling campaigns performed in Burriana (Spain) in the frame of B.E.M.A. project. The daily trends of photosynthesis (A) showed higher values at morning and a decrement during the hottest hours of the day; for leaf transpiration (E) we observed a slight increment during the day. During different months (May '96, June '97 and July '95) we noted a progressive reduction in gas exchange of the leaves in relation to build-up of summer stress condition (-49% and -60% for June and July respect to May). In particular, net photosynthesis and leaf transpiration measured on Citrus leaves were, in general, characterised by low average values (2.7 +/- 0.06 (s.e.) mu mol CO2 m(-2)s(-1) and 0.665 +/- 0.021 (s.e.) mmol H2O m(-2)s(-1) for current leaves, respectively). The relationship between biogenic volatile organic compound (BVOC) emission rates normalised by assimilation (A) and gas exchange parameters as E/A ratio is reported. This latter is considered as an useful functional index to determine different vegetation types on a functional basis. We also found a good correlation between BVOC normalised emissions with air temperature. This behaviour has been reported for other species having monoterpene compounds in storage structures as Pinus species. Moreover, it is evident an uncoupling between BVOC emissions and photosynthesis. (C) 1999 Elsevier Science Ltd. All rights reserved
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Annual estimations of ecophysiological parameters and biogenic volatile compounds (BVOCs) emissions in Citrus sinensis (L.) Osbeck
No full textChemical and physical interactions among trace gases (CH4, N2O, VOCs) contribute towards greenhouse effects. This paper by using a original simulation model analyses the annual trends of net photosynthesis, transpiration, and water use efficiency, the total primary production and finally the emission of monoterpenes from orange groves located in the Burriana plain (Spain). The net photosynthetic rate showed a bell-shaped trend with maximum average values of 3.5 mu molCO(2) m(-2) s(-1) calculated for the months of June and July. The canopy transpiration rate reached maximum values of approximately 2.5 mmolH(2)O m(-2) s(-1). Monoterpene emissions displayed a relevant increase during spring time reaching the highest values ol approximately 70 ng monoterpene m(-2) s(-1) during the summer period and a progressive decrease during the successive months. The loss of carbon by monoterpene emissions for the different plant organs is evaluated at approximately 0.404% of the total carbon fixed by photosynthesis (559.77 gC m(-2) y(-1)). On a fractionated basis the contribution of the leaves is 0.083% those of the fruits is 0.243% (for a period lasting from July to December), and only for the May period 0.079% for the flowers
Analysis of Environmental quality by means of bioindication and biomonitoring studies on plant species
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
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