1,721,131 research outputs found
Role of vacuum fluctuation forces in thin metal film stability
No full textThin metal films are subject to the pressure caused by the zero-point oscillations of the electromagnetic field, which depends upon the film optical properties and the substrate reflectivity. It has been suggested that the force may be relevant in determining the stability of deposited pseudomorphic films with respect to buckling or island formation. We present a detailed analysis of its behaviour as a function of the optical parameters and we illustrate the conditions under which it may play some role
The soil fauna of a perifluvial buffer of the Secchia river (Reggio Emilia, Emilia-Romagna)
No full textIn aprile 2018 è stato intrapreso uno studio biologico dell’area perifluviale di un tratto collinare del
Fiume Secchia in località Tressano di Castellarano (Reggio Emilia). La prima indagine si è concentrata
sulla comunità macrozoobentonica che popola uno stagno situato nel cuore di quest’area. I
macroinvertebrati bentonici sono considerati ottimi bioindicatori della qualità dell’ambiente acquatico;
per questo motivo sono state valutate sia la loro ricchezza specifica, sia l’abbondanza. Oltre alla
determinazione morfologica dei macroinvertebrati, i dati quali-quantitativi sono stati sottoposti ad
analisi multivariate. Inoltre, nel corso dello studio sono stati registrati i parametri chimico-fisici delle
acque. I dati preliminari hanno consentito di ottenere un quadro qualitativo dello stagno, funzionale
a futuri progetti di valorizzazione ambientale.Analysis of the macrozoobenthic community within a perifluvial buffer zone of the River Secchia
(northern Italy). In April 2018, a biological study of a foothill perifluvial buffer zone of the River
Secchia at Tressano di Castellarano (province of Reggio Emilia) was carried out. First investigations
focused on the macrozoobenthic community of a pond located within the study area. Benthic
macroinvertebrates are considered excellent bioindicators of the quality of the aquatic environment:
so, both the richness and abundance of species were assessed. In addition to the morphological
determination of macroinvertebrates, quali-quantitative data underwent multivariate analyses.
Finally, water chemical-physical parameters were recorded during the study. The preliminary data
allowed a qualitative picture of the pond to be obtained, which can be useful for future environmental
improvement projects
A study of the electromagnetic-fluctuation-induced forces on thin metallic films
No full textUsing the plasma model for the metal dielectric function we have calculated the electromagnetic fluctuation induced force of a free standing metallic film in vacuum as a function of the film size and plasma frequency. If the film is deposited onto a substrate or interacts with a plate, both the sign and the value of the force are modified. Il is shown that the force can change sign from attractice to repulsive upon changing the substrate plasma frequency
Analysis of the macrozoobenthic community of a perifluvial buffer of the Secchia river (Reggio Emilia, Emilia-Romagna)
No full textIn aprile 2018 è stato intrapreso uno studio biologico dell’area perifluviale di un tratto collinare del
Fiume Secchia in località Tressano di Castellarano (Reggio Emilia). La prima indagine si è concentrata
sulla comunità macrozoobentonica che popola uno stagno situato nel cuore di quest’area. I
macroinvertebrati bentonici sono considerati ottimi bioindicatori della qualità dell’ambiente acquatico;
per questo motivo sono state valutate sia la loro ricchezza specifica, sia l’abbondanza. Oltre alla
determinazione morfologica dei macroinvertebrati, i dati quali-quantitativi sono stati sottoposti ad
analisi multivariate. Inoltre, nel corso dello studio sono stati registrati i parametri chimico-fisici delle
acque. I dati preliminari hanno consentito di ottenere un quadro qualitativo dello stagno, funzionale
a futuri progetti di valorizzazione ambientale.Analysis of the macrozoobenthic community within a perifluvial buffer zone of the River Secchia
(northern Italy). In April 2018, a biological study of a foothill perifluvial buffer zone of the River
Secchia at Tressano di Castellarano (province of Reggio Emilia) was carried out. First investigations
focused on the macrozoobenthic community of a pond located within the study area. Benthic
macroinvertebrates are considered excellent bioindicators of the quality of the aquatic environment:
so, both the richness and abundance of species were assessed. In addition to the morphological
determination of macroinvertebrates, quali-quantitative data underwent multivariate analyses.
Finally, water chemical-physical parameters were recorded during the study. The preliminary data
allowed a qualitative picture of the pond to be obtained, which can be useful for future environmental
improvement projects
Nanofriction in cold ion traps
Full text linkSliding friction between crystal lattices and the physics of cold ion traps are so far non-overlapping fields. Two sliding lattices may either stick and show static friction or slip with dynamic friction; cold ions are known to form static chains, helices or clusters, depending on the trapping conditions. Here we show, based on simulations, that much could be learnt about friction by sliding, through, for example, an electric field, the trapped ion chains over a corrugated potential. Unlike infinite chains, in which the theoretically predicted Aubry transition to free sliding may take place, trapped chains are always pinned. Yet, a properly defined static friction still vanishes Aubry-like at a symmetric–asymmetric structural transition, found for decreasing corrugation in both straight and zig-zag trapped chains. Dynamic friction is also accessible in ringdown oscillations of the ion trap. Long theorized static and dynamic one-dimensional friction phenomena could thus become accessible in future cold ion tribology
Lights on 2,5-diaryl tetrazoles: applications and limits of a versatile photoclick reaction
No full textRecently, photoclick chemistry emerged as a powerful tool employed in several research fields, from medicinal chemistry and biology to material sciences. The growing interest in this type of chemical process is justified by the possibility to produce complex molecular systems using mild reaction conditions. However, the elevated spatio-temporal control offered by photoclick chemistry is highly intriguing, as it expands the range of applications. In this context, the light-triggered reaction of 2,5-diaryl tetrazoles with dipolarophiles emerged for its interesting features: excellent stability of the substrates, fast reaction kinetic, and the formation of a highly fluorescent product, fundamental for sensing applications. In the last years, 2,5-diaryl tetrazoles have been extensively employed, especially for bioorthogonal ligations, to label biomolecules and nucleic acids. In this review, we summarized recent applications of this interesting photoclick reaction, with a particular focus on biological fields. Moreover, we described the main limits that affect this system and current strategies proposed to overcome these issues. The general discussion here presented could prompt further optimization of the process and pave the way for the development of new original structures and innovative applications
Long-term survival in myocardial infarct. Analysis of the post-infarct course in relation to the clinical aspects of the acute phase
No full text
The efficacy of ibopamine in long-term treatment of dilated cardiomyopathy. A clinical and instrumental evaluation
No full textThe aim of this study was to investigate whether long-term treatment with ibopamine (SB-7505), the 3,4-diisobutyryl ester of N-methyldopamine, in patients with severe symptomatic congestive cardiomyopathy is associated with an improvement in cardiovascular conditions. The investigation was carried out in 18 outpatients with idiopathic or post-ischemic dilated cardiomyopathy and chronic severe heart failure (NYHA (New York Heart Association) Class III-IV). Patients were randomly assigned to a protocol in which either digitalis and diuretis (8 patients, Group 2) or the same treatment plus ibopamine (10 patients, Group 1) were given. There were no significant differences between the two groups in age, weight, height, functional class and duration of symptoms. The results obtained showed that cardiovascular conditions worsened dramatically in the group of controls during the 10-week period, irrespective of the treatment with digitalis and diuretics. Some of the parameters deteriorated significantly (p < 0.05 or < 0.01) such as systolic and diastolic left ventricular diameters, fractional shortening, end-systolic stress and pressure/diameter ratio, and other parameters showed a tendency to become worse (exercise time, cardiothoracic ratio). On the contrary, in patients of group 1, ibopamine in association with digitalis and diuretics appeared to preserve left ventricle function from a progressive worsening. None of the parameters deteriorated with ibopamine by contrast with a sharp decrease in the control group. Some of the parameters (fractional shortening, pressure/diameter ratio, exercise time) showed a tendency to improve although not significantly. The data suggest that 10 weeks treatment with ibopamine may prevent any deterioration or even produce a mild improvement in patients with very severe congestive heart failure
- …
