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Search Results: 1 - 10 of 102 matches for " Dejair;CASSINI "
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Efeito de extratos de própolis verde sobre bactérias patogênicas isoladas do leite de vacas com mastite
PINTO, Marcelo Souza;FARIA, José Eurico de;MESSAGE, Dejair;CASSINI, Sérvio Túlio Alves;PEREIRA, Carmen Silva;GIOSO, Marilú Martins;
Brazilian Journal of Veterinary Research and Animal Science , 2001, DOI: 10.1590/S1413-95962001000600006
Abstract: in vitro, the sensitivity to different propolis extracts, at a concentration of 100 mg/ml, of staphylococcus aureus, staphylococcus sp. coagulase negative, streptococcus agalactiae and bacteria of the coliform group, isolated from the milk of cows with mastitis, was evaluated using the technique of an agar disk diffusion with a medium doublelayer. the results showed that the commercial propolis, the ethanolic extract, and, in a minor proportion, the methanolic extract inhibited the growth of the gram positive bacteria, staphylococcus aureus, staphylococcus sp. coagulase negative and streptococcus agalactiae. the extracts obtained through water, etila acetate and chloroform did not inhibit any bacterial strains, nor did the pure ethanol and methanol vehicles that were utilized as controls. the gram negative bacterium tested, from the coliform group, did not show sensitivity to any extract. bacterial strains of the same species collected from different sources presented significant differences in sensitivity to the extracts (p < 0.05). in the streptococcus agalactiae samples, the diameters of the zone of inhibition around the disks were bigger than those observed for samples of staphylococcus aureus and staphylococcus sp. coagulase negative. the results of this experiment stimulate the continuation of studies on the use of propolis extracts, by means of using the appropriate vehicles for the treatment of bovine mastitis.
Confirmación hipotético-deductiva y confirmación bayesiana
Cassini,Alejandro;
An??lisis filos?3fico , 2003,
Abstract: bayesians often affirm they have produced the best available theory of confirmation. in particular, they claim to have superseded the venerable hypothetico-deductive method. in this paper i intend to assess that claim by making a systematic comparison between both theories of confirmation. i begin by listing the main problems of hypothetico-deductive confirmation. i then show that this conception is incompatible with hempel's conditions of adequacy for qualitative confirmation. i expound the bayesian theory of confirmation with some detail in order to show that this theory is able to solve three out of the five fundamental problems of hypothetico-deductive confirmation. largue that the remaining two problems (alternative hypotheses and epistemological holism) are still open questions for the bayesians.
La invención del neutrino: un análisis epistemológico
Cassini, Alejandro;
Scientiae Studia , 2012, DOI: 10.1590/S1678-31662012000100002
Abstract: by 1930 the explanation of beta radioactive decay produced a crisis in the domain of particle physics. conservation of energy, momentum and quantum statistics seemed to be challenged. pauli succeeded in solving all these anomalies by postulating the existence of neutrinos inside atomic nuclei. but he did it at the cost of assuming a model of the nucleus that was untenable after 1932, when the neutron was discovered. in 1933 fermi put forward what we still regard as the correct explanation of beta decay. in this article i review the explanatory virtues of the neutrino hypothesis. i contend that pauli's invention was ad hoc in 1930 but it became a testable hypothesis in the context of fermi's theory. i then conclude by asserting that there was not enough evidence to accept the existence of the neutrino prior to cowan and reines' second experiment in 1956.
Gregorio Klimovsky: 1922-2009
Alejandro Cassini
Revista Latinoamericana de Filosofía , 2009,
Abstract:
Mario Bunge: Siete décadas con la filosofía
Alejandro Cassini
Revista Latinoamericana de Filosofía , 2009,
Abstract:
Revoluciones en Física
Alejandro Cassini
Revista Latinoamericana de Filosofía , 2007,
Abstract:
Roberto Torretti en su octogésimo aniversario
Alejandro Cassini
Revista Latinoamericana de Filosofía , 2010,
Abstract:
Horacio Arló-Costa: (1956-2011)
Alejandro Cassini
Revista Latinoamericana de Filosofía , 2011,
Abstract:
Exposi??o pré-natal ao etanol: toxicidade, biomarcadores e métodos de detec??o
Cassini, Carina;Linden, Rafael;
Revista de Psiquiatria Clínica , 2011, DOI: 10.1590/S0101-60832011000300006
Abstract: background: prenatal exposure to ethanol can produce a complex set of effects on fetal development, which is denominated fetal alcohol spectrum disorder (fasd). early detection of ethanol exposure can allow the prevention of some relevant adverse effects associated to fasd. objectives: the aim of this work was to review the main toxic effects of ethanol on the neonate and the available biomarkers of prenatal alcohol exposure. methods: a bibliographic search was performed in pubmed employing the terms "effects maternal ethanol exposure" and "biomarkers ethanol prenatal exposure" and cross references. results: many adverse effects on fetal development were described, especially deficits in the central nervous system. the biomarkers of ethanol exposure more widely described were fatty acid ethyl esters (faees), ethyl glucuronide (etg) and ethyl sulphate (ets), being meconium and hair the most common biological matrices for laboratorial evaluation. discussion: the early detection of alcohol exposure in intra-uterine life is useful to prevent the secondary effects of fasd through pharmacologic and educational intervention in affected children.
La reinterpretación radical del experimento de Michelson-Morley por la relatividad especial
Cassini, Alejandro;Levinas, Leonardo;
Scientiae Studia , 2005, DOI: 10.1590/S1678-31662005000400002
Abstract: we attempt to elucidate how different theoretical assumptions bring about radically different interpretations of the same experimental result. in order to do it, we analyze einstein's special relativity as it was originally formulated in 1905. we then examine its singular relation with the result of the 1887 michelson-morley experiment. we point out that in diverse historical contexts one and the same experiment can be thought of as providing different - often incompatible - conceptualizations of phenomena. this permits us to show why special relativity prevailed over its rival theories. einstein's theory made possible a new reinterpretation of michelson-morley experiment by relating it with a novel phenomenon, namely, the invariance of the speed of light, which was not the one originally investigated in that experiment. this fact enables us to answer the question about how this experiment could have been interpreted in a completely different historical context, such as seventeenth-century science, when earth's orbital motion was still a questionable hypothesis.
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