196,657 research outputs found
Compound action potential of sensory tail nerves in the rat
No full textAssessment of the conduction velocity of motor fibers of the rat tail nerves has been used by some authors in the past, but very little is known
about the sensory fibers. In 10 adult rats, weighing between 320 and 380 g, responses from the nerves and muscles of the tail have been recorded
after stimulation at its root and tip. It was found that stimulation of the tip involved mainly sensory fibers, of which two main groups could be
identified. One faster group, conducting within the range of 38–27 m/s, and one slower group with range 14–7 m/s. The bipolar recording
configuration was found to be optimal for sensory recording. Stimulation of the tail root evoked a motor response, which was preceded by a very
small neurographic activity, due to the fastest sensory fibers conducting antidromically. The conduction velocity of motor fibers was calculated to
be approximately 19 m/s. Distance traveled by the volley can be assessed with excellent precision on the tail nerves; hence the calculated
conduction velocities are highly reliable and reproducible. We propose that the tail nerves may be a useful tool for evaluation of conduction
velocity of Aβ and Aδ afferents. As the technique is just minimally invasive, the test can be repeated a number of times in animals under chronic
experimental conditions
La conurbazione centro adriatica abruzzese: una piccola "metropoli" di rango sovra regionale
No full textThe incomplete reform of local authorities (Law 56/2014), identifiable with the whole Delrio’s project, by now completely unworkable, other than inadequate under a variety of aspects, has not delineated new and effective models of governance, useful in terms of representation, care and management of strategic issues at the scale of Area Vasta. The reform has not restructured the form of government of intermediate authorities, nor has it defined, from a spatial and a functional perspective, their appropriate ‘pertinent dimension’. In addition, the reform has reiterated the choice of the Metropolitan Cities operated in 1990, hastily assimilating their borders to those of the provinces, confirming the highly unbalanced territorial situations and denying the metropolitan representativeness to some cities with functional supra-regional rank. Under this last condition is the conurbation of Pescara-Chieti, which is presented here as a case study
PALEOCLIMATE AND PALEOENVIRONMENT IN NORTH-WESTERN ITALY (SOUTHERN ALPS) DURING THE LAST GLACIAL STAGE: THE SMALL-MAMMAL RECORD FROM THE BUCO DEL FRATE CAVE (PREVALLE – BRESCIA)
No full textThe palaeoclimatic and palaeoenvironmental data obtained by the study of the Buco del Frate cave small-mammals indicate that, around 40,000 years ago (MIS3), the eastern part of the province of Brescia, immediately to the west of Lake Garda, was characterised by the presence of open taiga environment and watercourses crossing the plain facing the cave.
Specifically, the palaeoclimatic conditions of this part of north-western Italy around 40,000 years ago – compared to climate data for the years 1960-90 measured at Ghedi, 20 km southwest of the Buco del Frate cave – involved average temperatures some 4° C cooler and rainfall some 30% lower.
Based on the collected data we show that the western part of the Po Valley, west of Lake Garda, was characterized by a steppe-like environment, not too different from the almost contemporaneous site of Settepolesini di Bondeno (Ferrara), defined as "mammoth steppe".
We also note that the western Po Valley, if compared with deposits from high- and medium-mountain contexts in the same area, was characterized by a more steppe-like environment. Indeed, the mountain settings, in perhaps more sheltered areas, indicate the presence of environments with more trees (or, at least, bushes)
A paleogenetic study from Erimi-Laonin tou Porakou: preliminary results and future perspectives.
No full textThe biological history of protohistoric Cypriots was shaped by the early colonization of the island during the Neolithic and the following dynamics of isolation and migration during the Bronze Age. This results in a continuous gene flow that introduced new genetic components to the island communities. However, genetic patterns in ancient Cypriot population are still unknown, due to the difficult preservation of molecules in warm climates. This paper presents a preliminary paleogenetic study from three individuals from Middle Bronze Age Erimi-Laonin tou Porakou (Limassol). Target-enrichment method allowed to retrieve original ancient molecules, but the poor state of the remains highlights the necessity of apply improved methods for molecular analysis of samples in warm areas, such as those from Eastern Mediterranean
Differences in chemical composition and internal structure influence systemic host response to implants of biomaterials.
No full textA Decision Model for Enhancing Driving Security
No full textDriving is a complex activity which requires constant care and attention. Intelligent Advance Driver Assistance Systems (ADAS) can improve vehicle control performance and, thus, drivers and passengers safety. In particular, identification and prediction of driving intention can provide prompt information to drivers and vehicles in their vicinity that are fundamental for avoiding collisions. In this paper, we propose a lane change prediction model based on machine learning able to distinguish between left and right lane changes, a distinction that becomes particularly important when driving in a highway. Models have been trained and validated using a real dataset gathered online by using a high-tech demonstrator vehicle provided by Centro Ricerche Fiat (i.e., Fiat Research Center). Data, which refer to real driving conditions on a highway, have been collected by monitoring different drivers showing different behaviors. We address the problem of unbalanced data, typical of real data sets, and propose two prediction models based on Support Vector Machines and Random Forests. The results of our computational experiments show the validity of the approach with respect to state of the art models, both in terms of prediction accuracy and prediction time
Variabilità del microbiota e dieta nelle mummie di Roccapelago
No full textLe mummie di Roccapelago (MO) rappresentano un eccezionale ritrovamento archeologico, sia perché costituiscono un raro esempio di preservazione naturale dei membri di un'intera comunità montana di umile estrazione, vissuti in un arco temporale di circa due secoli, sia a motivo dell’eccezionale stato di conservazione degli inumati. Lo scavo archeologico nella cripta della Chiesa della Conversione di S. Paolo Apostolo a Roccapelago ha infatti permesso di recuperare i resti di oltre 400 individui, di cui circa 60 almeno parzialmente mummificati. La datazione dei reperti, effettuata sulla base della cultura materiale e dei registri parrocchiali, è stata circoscritta ad un arco temporale compreso tra la fine del XVI e la fine del XVIII secolo. Il processo di mummificazione che ha interessato una parte degli inumati è da attribuire plausibilmente alle peculiari condizioni microclimatiche della cripta, caratterizzate dall’aria secca e dalla particolare ventilazione, assicurata da due piccole finestre aperte sulla vallata. Le analisi preliminari sullo stato di conservazione dei tessuti molli mummificati, condotte mediante Spettroscopia Infrarossa in Trasformata di Fourier (FTIR) e Microscopia Elettronica a Scansione (SEM), hanno evidenziato, in generale, una buona conservazione delle strutture anatomiche e parziali alterazioni dei tessuti, preservati dalle condizioni chimico-fisiche dell’ambiente di deposizione. Le analisi antropologiche e paleopatologiche eseguite sui medesimi reperti hanno rivelato aspetti interessanti relativi alle caratteristiche fisiche e alle condizioni di vita e di salute dell’antica popolazione di Roccapelago, tra cui la notevole longevità di numerosi suoi membri, nonché il parziale isolamento geografico che ha caratterizzato la storia di questa comunità.
Le peculiari condizioni di conservazione di una parte delle mummie di Roccapelago hanno infatti permesso di effettuare l’analisi molecolare del microbiota umano, cioè delle comunità di microrganismi presenti in diversi tessuti di individui vissuti tra il XVI e il XVIII secolo
AMNIOTIC LIQUID DERIVED STEM CELLS AS RESERVOIR OF SECRETED ANGIOGENIC FACTORS CAPABLE OF SIMULATING NEO-ARTERIOGENESIS IN AN ISCHEMIC MODEL
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
- …
