1,721,076 research outputs found
Osteoclastic differentiation in two murine cell clones:expression of neuronal oxide synthase (NOS) isoform and TNF-related apoptosis induced ligand (TRAIL) in osteoclastogenesis.
No full textIMMUNOLOCALIZATION OF PROTEIN KINASE C ALPHA, DELTA, EPSILON, ZETA DURING PRE-OSTEOCLASTS DIFFFERENTIATION INDUCED BY RANKL AND M-CSF
No full textInvestigation on the porosity development by CO2 activation in heavy oil fly ashes
No full textThe porosity evolution in heavy oil fly ashes subjected to activation with CO2 has been examined. The work examined four different heavy oil fly ashes that, after preliminary acid leaching, have been pyrolyzed at 900 °C and then activated with CO2 at the same temperature for different times. A different evolution of porosity was observed according to the different reactivity of the samples during activation. The activated samples have been characterised as regards the surface area and the pore volume. The scanning electron microscope-energy dispersive spectrometer microanalysis has been used to interpret the experimental results
Size and structural characterization of lignin-cellulosic fuels after the rapid devolatilization
No full textThe aim of this work is to develop and test a method for assessing the size and the morphology of biomass fuels and their chars. Severe thermal conditions (high temperature and heating rate) are programmed during the pyrolysis, focusing on characteristics of chars in combustion or gasification. An image analysis program is used to quantitatively study several scanning electron microscopy images of fuel and char samples. Distributions of results are obtained for a significant number of particles from a statistical point of view. Average values and the standard deviations of the distributions quantify the heterogeneous nature of the fuel and char particles, providing useful parameters for advanced modeling. Size, shape factors (aspect and roundness) and superficial parameters are defined and measured (or calculated) developing a procedure for a low time-consuming analysis. The structural variations caused by the fast release of a high amount of volatile products are evaluated comparing the results obtained on fuel and char particles. The results are discussed to assessing the suitability of the selected parameters and the possibility to quantify softening, melting, shrinking and fragmentation phenomena. The method is applied to two biomass fuels of different origin and chemical composition: wood pellets and olive residue. (C) 2007 Elsevier Ltd. All rights reserved
On the presence of a secondary cartilage in the mental symphyseal region of human embryos and fetuses.
No full textThe presence of a secondary cartilage in the mental symphyseal region was examined in this study. A double-staining method with alcian blue and alizarin red S was performed on both whole human embryos and fetuses (developmental age between 8 and 17 weeks, crown-rump length, CRL, between 37 and 124 mm) and their disjointed mandibles. Histological and histochemical techniques were applied to transverse serial sections of whole disjointed fetal heads. The ossification process observed in the mental symphysis is quite different from that of the mandibular body, whose membranous ossification is induced by the contiguous Meckel's cartilage. No evidence of any fusion of Meckel's cartilage with the symphyseal cartilage, that lies within the symphyseal space, was detected. On the basis of these findings, we suggested that the mental secondary cartilage is able to change into bone according to an endochondral ossification process. Moreover, the role of mechanical causes in the development of the mental symphysis was hypothesized
Selective distribution of multiple protein kinase C isoforms in mouse cerebellar cortex.
No full textAn immunohistochemical study concerning the distribution of protein kinase C isoforms, a lipid-regulated serine/threonine kinase essential for signal transduction, was performed in mice cerebellar cortex, with particular emphasis on the localization of -iota and -lambda isozymes. By the means of immunoblotting analyses we detected the presence of 11 PKC subspecies in whole cerebellar extracts. Immunoreactivity on cryostat sections revealed, using polyclonal and monoclonal antibodies, that a few isoforms were widely but discretely distributed in all three cortical layers (molecular, granular and Purkinje cells) whereas other isozymes were present in a limited neuronal compartment. Overall, the distribution of several isoforms was in agreement with data obtained by other authors using rat cerebellum. As far as -iota and -lambda isozymes were concerned, we found them abundantly expressed in endothelial cells. Moreover, protein kinase C-lambda was also present in the body of Purkinje cell, conceivably associated with a 200-kDa neurofilament component. In all, these results hint at the possibility that in the cerebellar cortex at least some protein kinase C isoforms are involved in functions other than signal transduction at the synaptic level
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