398 research outputs found
Stress Echocardiography and myocardial Contrast Echocardiography in Viability Assessment
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X-ray magnetic circular dichroism investigation of the superparamagnetic transition-metal ion-cluster r-Mn12Bz
No full textNMR investigation of Gd(hfac)3NITEt fully frustrated helimagnet
No full textThe family of the quasi-1D molecular magnetic chains Gd(hfac)3NITR (where hfac is hexafluoro-acetylacetonate and NITR is 2-R-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-l-oxyl 3-oxyde) have assumed a great importance in the study of molecular magnets in the last 10 years. These chains develop along b crystallographic axis and consist in a regular pattern of Gd(hfac)3 moieties (S_Gd=7/2) alternated to nitronyl-nitroxide organic radicals NITR (R = iPr, Et, Ph, Me) (srad=1/2). In these derivatives the shortest interchain distance is about 10.5Å and, as a consequence, the ratio between interchain and intrachain exchange interactions is Jinter/Jintra1.9K while just below the transition temperature T(c)^3D=1.9K becomes suddenly much larger (>1 MHz), due to the insurgence of a local field Hloc at protons sites, generated by the ordered arrangement of the electronic spins
Integrating AHP and GIS Techniques for Rural Landscape and Agricultural Activities Planning
No full textThis chapter aims at providing some insights on the usefulness of the analytic hierarchy process (AHP) in the context of geographic multi-criteria analysis applied to GIS techniques for empirical applications. The increasing complexity in planning and programming applied to rural landscape and territories asks for multidisciplinary and transdisciplinary approaches based on a holistic knowledge system. The AHP allows organizing in a hierarchic way both quantitative and qualitative information related to different disciplines, usually expressed in in-commensurable measure units. Participatory approaches can be included either through information based on the perception of the value of indicators (criteria) or by providing weights on the relative importance of the elements included in each hierarchical level. When applied to GIS techniques, the AHP allows taking into account both spatial distribution of elements/information and their physical relations, which are paramount for the analysis of interventions about landscape, biodiversity, etc. This chapter illustrates four case studies from Tuscany Region (Italy) where this approach has been applied. Results highlight the flexibility of this approach in planning, programming and designing specific interventions where several biophysical characteristics of a territory or landscape have to be integrated with socioeconomic information both at territorial and farm levels. Results show that it is possible to increase the effectiveness and efficiency of tools for the territorial governance by applying a scientifically sound approach that does not ask for complex mathematical models and provides a methodology and results that can be understood also by “non-experts”, improving participation processes
Post-synthetic Isotopic Labeling of an Azamacrocyclic Ligand
No full textA simple post-synthetic method for the preparation of 1,4,7-triazacyclononane-d(12) (90% atom D) is reported. The macrocycle is first converted into 1,4,7-trinitroso-1,4,7-triazacyclononane, whose solid-state and solution properties are herein described. In CD3OD/D2O solution, the trinitroso derivative undergoes fast base-catalyzed H,D exchange on the whole set of methylene hydrogens and can be subsequently denitrosated by reduction with Ni/Al alloy
Diagnosis of transient acute myocardial ischemia in man by M-mode echocardiography
No full textUnder basal conditions the echocardiographic findings in anginal patients (pts.) without previous myocardial infarction appears usually normal. Consequently, the usefulness of the ultrasounds evaluation in angina pectoris has been commonly considered poor and the utilization of this technique in coronary artery disease has been restricted to the detection of myocardial infarction in its acute phase or to its chronic mechanical alterations. The purpose of this study was to assess the possibility offered by M-mode echocardiography to detect changes caused by transient myocardial ischemia at rest in man, in view of the possible diagnostic application of this technique. The reported results were obtained from 25 ischemic attacks (13 spontaneous and 12 ergonovine induced) with ST segment elevation or pseudonormalization of a basally negative T wave at rest. The semiautomatic computerized analysis of echocardiograms continuously recorded during these attacks showed a reduction of motion and of systolic thickening, accompanied by a diastolic thinning of the wall involved by the ischemia. These changes occur very early: they appear few seconds before ECG changes and are accompanied by a reduction of contraction and relaxation dP/dt and precede the onset of chest pain; moreover, they are followed by an increase in left ventricular internal diameters. In conclusion M-mode echocardiography is a sensitive technique capable to detect transient myocardial ischemia in the course of spontaneous or induced angina with ST segment elevation or positivity of negative T wave. This approach could be helpful in the diagnostic evaluation of patients with atypical chest pain and/or aspecific ECG changes and it can be complementary to other non invasive techniques such dynamic ECG and nuclear cardiology techniques
- Infezione da BHV1 nella capra. Isolamento ed identificazione del virus, riattivazione dell’infezione latente.
No full textUn virus isolato dal cervello di una capra morta con sintomi neurologici, è stato identificato come BHV-1.
La differenziazione con l' herpesvirus caprino antigenicamente correlato BHV-6 è stata raggiunta mediante il fingerprinting delle endonucleasi di restrizione.
L' infezione da BHV-1 è stata riattivita in una capra sieropositiva della stessa mandria, attraverso trattamento con desametasone
Serial changes in cardiac output monitored by transcutaneus aortovelography: good correlation with thermodiluition
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