1,721,074 research outputs found
Dinamica evolutiva di popolamenti forestali su terreni abbandonati.
No full textL'abbandono dei campi coltivati e dei pascoli nelle aree marginali del nostro Paese, ha reso possibile su di essi lo sviluppo di una vegetazione non più legata alle pratiche colturali ma in equilibrio con i fattori ambientali. Nell'Italia settentrionale ciò ha comportato spesso il ritorno del bosco. Dopo una breve rassegna bibliografica si illustrano le attività del Dipartimento Agroselviter realizzate in due aree del Canavese (TO): attraverso rilievi fitosociologici e della struttura forestale si è cercato di individuare quali siano i rapporti intercorrenti tra lo stato di abbandono del fondo, la tipologia fitosociologica presente e la struttura forestale sviluppatasi
Acetoxylation by aryliodoso acetates. II. Kinetics of the reaction of phenyliodoso acetate with aceto-p-toluidide
No full textThe reaction of phenyliodoso acetate and
aceto-p-toluidide in acetic acid is first order in each reactant and measured
rates fit the Arrhenius equation in the temperature range 15-45 �C. Addition of
water to the solvent markedly accelerates the reaction, whereas addition of
benzene lowers the rate and acetic anhydride has little effect. A polar
transition state is indicated.
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Dinamica evolutiva di popolamenti forestali di neoformazione nel piano montano
No full textThe aim of this work was to study the dynamic of the vegetational evollution in a secundary succession on fallow land in mountain environment of external Alps. Using fitosociological and stand structural analysis we have studied the exisiting relationships between actual situation of fallows, fitosociological types, stand structure and time needed to performe the various phases. The main factor influencing the evolution seems to be time interval from the neglect of the land use, the presence of mother trees, the wild fires
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Efficacy of Psychological Interventions on Depression Anxiety and Somatization in Migrants: A Meta-analysis
Full text linkMany studies reveal the effectiveness of different psychological interventions on the adult refugees reporting mental health distress. Aim of this metanalysis was to test the efficacy of different psychological treatments on the depressive, anxiety and somatization symptoms on refugees and asylum seekers. Fifty-two studies, since 1997 to 2019, were included in the systematic review and 27 of those were included in the metanalysis. Studies providing a pre and post treatment methodological design were included. All treatments reported significant effects on the three outcomes. Qualitative observations showed a probability to have a significant pre-post treatment effects on trials with outcome of depression (56%), anxiety (44%), and somatization (42%). Cognitive behavioral treatment resulted the most effective treatment. The status of refugee compared to the status of asylum seeker seems to have a great effect on the effectiveness of the treatment
The emerging role of the BDNF-TrkB signaling pathway in the modulation of pain perception
No full textThe brain derived neurotrophic factor (BDNF) is a crucial neuromodulator in pain transmission both in peripheral and central nervous system (CNS). Despite evidence of a pro-nociceptive role of BDNF, recent studies have reported contrasting results, including anti-nociceptive and anti-inflammatory activities. Moreover, BDNF polymorphisms can interfere with BDNF role in pain perception. In Val66Met carriers, the Met allele may have a dual role, with anti-nociceptive actions in normal condition and pro-nociceptive effects during chronic pain. In order to elucidate the main effects of BDNF in nociception, we reviewed the main characteristics of this neurotrophin, focusing on its involvement in pain
Alignment efficiency and dento-alveolar effects of self-ligating time 3 and Alexander bracket systems in the treatment of mandibular crowding: a randomized clinical trial
No full textModifiche strutturali dell’articolazione temporo-mandibolare sottoposta al carico di una mentoniera : analisi agli elementi finiti
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