5 research outputs found
Thermal Stability and Mechanical Properties of Al-Al2O3 Nanocomposite Produced by Mechanical Milling and Hot-Pressing
In this study, Al-Al2O3 nanocomposite powders containing 5, 10 and 15 Wt% of nanopowder were
produced by mechanical alloying. For comparing, Al-Al2O3 composite powder containing 5Wt% of
micrometric Al2O3 was also produced. The powder was then hot-pressed in a mold to produce bulked parts.
The effect of Al2O3 content on grain growth, density, hardness and bending strength of bulked composite
was discussed and microstructures were investigated by optical, scanning and transmission electron
microscopy. The results revealed that when nanometric particles were used instead of micrometric
particles the grain growth was reduced, while the increase of particle weight percentage did not affect the
grain growth. The results also showed that when weight percentage of nanometric particles was increased,
although hardness of bulked parts was increased but relative density and bending strength was reduced
severely.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3493
Angiogenesis and expression of tenascin after transmural laser revascularization
Transmyocardial revascularization (TMR) with CO2-laser equipment is an alternative approach in the treatment of patients with severe ischemic cardiac disease. Several studies concerning morphological features after TMR document a strong transmyocardial injury, but little is known about wound healing in laserinduced alterations of the cardiac skeleton and their putative role for angiogenesis and endothelialization. The present study was conducted to establish a useful immunohistochemical marker for detection of these laser-induced injuries and to analyze starting points of angiogenesis in human myocardium after TMR. Our data show that tenascin labeling is a useful immunohistochemical approach to detect laser-alterated segments of the cardiac skeleton as well as laser-induced fibrosis. Starting points of the angiogenetic process are seen throughout the margins of laser-induced lesions, where myocardial capillaries are found. Disrupted vessels located within laser-alterated connective tissue septa are not major starting points for endothelialization of laser-induced lesions and for capillary sprouts. In comparison to laser-induced fibrosis, induction and promotion of angiogenesis by laser radiation is weak
Angiogenesis and expression of tenascin after transmural laser revascularization
Transmyocardial revascularization (TMR)
with CO2-laser equipment is an alternative approach in
the treatment of patients with severe ischemic cardiac
disease. Several studies concerning morphological
features after TMR document a strong transmyocardial
injury, but little is known about wound healing in laserinduced
alterations of the cardiac skeleton and their
putative role for angiogenesis and endothelialization.
The present study was conducted to establish a useful
immunohistochemical marker for detection of these
laser-induced injuries and to analyze starting points of
angiogenesis in human myocardium after TMR. Our
data show that tenascin labeling is a useful immunohistochemical
approach to detect laser-alterated
segments of the cardiac skeleton as well as laser-induced
fibrosis. Starting points of the angiogenetic process are
seen throughout the margins of laser-induced lesions,
where myocardial capillaries are found. Disrupted
vessels located within laser-alterated connective tissue
septa are not major starting points for endothelialization
of laser-induced lesions and for capillary sprouts. In
comparison to laser-induced fibrosis, induction and
promotion of angiogenesis by laser radiation is weak