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Search Results: 1 - 10 of 1138 matches for " Vinicius Ronzani; "
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Egg Development of Paralichthys orbignyanus (Valenciennes, 1839)
Cerqueira, Vinicius Ronzani;
Brazilian Archives of Biology and Technology , 2005, DOI: 10.1590/S1516-89132005000300016
Abstract: eggs of the southern brazilian flounder paralichthys orbignyanus were obtained through spawning induction and reared in laboratory. the eggs released were free-floating or pelagic. other important characteristics were: spherical shape, smooth chorion, narrow perivitelline space, and a single oil globule. egg and oil globule diameter were about 0.792 ± 0.008 mm and 0.114 ± 0.003 mm, respectively. the blastodisc was observed approximately 1 h after fertilization and followed by blastodisc cleavage. blastula stage started after about 5 h and gastrula stage after 9 h. approximately 20 h after fertilization, blastopore closure was observed. neurula or early embryo occurred after 24 h. cardiac beats and movements of the free embryonic tail were recorded after 40 h of incubation. hatching occurred after an incubation period of 40-50 h at temperatures ranging from 18 to 20 oc. newly hatched larvae were about 2.04 ± 0.024 mm long and quite undeveloped, with a large yolk sac with a posterior oil globule and sparse pigmentation. these results were greatly similar to those obtained by previous studies regarding congener species. this is one of the first steps towards the artificial propagation of this species under controlled conditions.
Effect of Light Intensity on Initial Survival of Fat Snook (Centropomus parallelus, Pisces: Centropomidae) Larvae
Cerqueira, Vinicius Ronzani;Brügger, André Macedo;
Brazilian Archives of Biology and Technology , 2001, DOI: 10.1590/S1516-89132001000400004
Abstract: different light intensities were tested during the larval rearing of fat snook (centropomus parallelus) to evaluate its influence on survival and functional swim bladder rate. newly-hatched larvae were obtained by stripping of hormonally induced broodstock, and were stocked in 32-liter tanks at densities from 30 to 50 l-1. four experiments were carried out testing six light intensities: 50, 100, 200, 500, 1500, and 2500 lx, and total darkness as a control. mean survival ranged from 0.06 to 16.0% and were significantly influenced by light intensity. complete darkness resulted in 100% mortality after one week, larvae appeared to have starved since they had empty stomachs. the species has the characteristics of a visual-feeder. survival was the highest at 200 lx, while at 500 lx was higher than at 50, 100, and 2500 lx. frequency of functional swim bladder ranged from 36.8 to 100%, but it was not significantly correlated with light intensity. based on this study, a medium light intensity, 200 to 1500 lx, is recommended for rearing fat snook larvae. extreme values must be avoided, mainly in the first two weeks after hatching.
Preserva??o de sêmen refrigerado de cioba com diluentes e atmosfera modificada
Sanches, Eduardo Gomes;Cerqueira, Vinicius Ronzani;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011001200013
Abstract: the objective of this study was to evaluate the effect of different diluents at normal and modified atmosphere on the preservation of refrigerated sperm of the mutton snapper lutjanus analis. sperm samples of 30 fishes were evaluated for motility rate, motility time, sperm concentration and spermatocrit. for the refrigeration at 4oc, three different diluents with distinct ionic compositions and ph values were tested at normal and at modified atmospheres (100% oxygen). afterwards, a fertilization test was accomplished to evaluate the viability of the refrigerated sperm. in the refrigeration experiment, the motility rate and the motility time were maintained appropriate for 72 hours for the extender a (48±7%, 190±26 s) and b (41±4%, 160±22 s) at normal atmosphere. at the modified atmosphere, the sperm quality fell drastically during the first 24 hours, independently of the utilized diluent, and there was no advantage in its use. the fertilization rate with refrigerated sperm for 24 hours, treated with the diluent a, was not different from that of fresh sperm, and both were higher than the one obtained with refrigerated sperm for 48 hours.
Effect of Light Intensity on Initial Survival of Fat Snook (Centropomus parallelus, Pisces: Centropomidae) Larvae
Cerqueira Vinicius Ronzani,Brügger André Macedo
Brazilian Archives of Biology and Technology , 2001,
Abstract: Different light intensities were tested during the larval rearing of fat snook (Centropomus parallelus) to evaluate its influence on survival and functional swim bladder rate. Newly-hatched larvae were obtained by stripping of hormonally induced broodstock, and were stocked in 32-liter tanks at densities from 30 to 50 L-1. Four experiments were carried out testing six light intensities: 50, 100, 200, 500, 1500, and 2500 lx, and total darkness as a control. Mean survival ranged from 0.06 to 16.0% and were significantly influenced by light intensity. Complete darkness resulted in 100% mortality after one week, larvae appeared to have starved since they had empty stomachs. The species has the characteristics of a visual-feeder. Survival was the highest at 200 lx, while at 500 lx was higher than at 50, 100, and 2500 lx. Frequency of functional swim bladder ranged from 36.8 to 100%, but it was not significantly correlated with light intensity. Based on this study, a medium light intensity, 200 to 1500 lx, is recommended for rearing fat snook larvae. Extreme values must be avoided, mainly in the first two weeks after hatching.
Influência da densidade de estocagem no cultivo de juvenis de robalo-flecha mantidos em laboratório
Souza-Filho, José Jer?nimo de;Cerqueira, Vinicius Ronzani;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003001100010
Abstract: the objective of this work was to evaluate the influence of stocking density on growth, feed conversion ratio and survival of juvenile common snook (centropomus undecimalis). fish were collected from the wild and trained to accept artificial diets. individuals (13±0.4 cm and 23±0.3 g) were stocked into nine 5-m3 circular fiberglass tanks at three different densities: 3, 6 and 9 fish/m3 during a period of 180 days. tanks were supplied with seawater and continuous aeration. total ammonia-nitrogen (0 to 0.5 mg/l), water temperature (23.3 to 30.6oc), salinity (17 to 34 g/l), ph (7.8 to 8.4) and dissolved oxygen concentration (4.8 to 6.9 mg/l) were similar in all tanks. feed conversion rate (1.88, 2.06 and 2.31) and survival (100%, 98.9% and 96.3%) were significantly improved for fish stocked at the lower densities (3 and 6/m3). there were significant differences in average weight (110, 87 and 80 g) and length (20, 18.5 and 18 cm) among treatments. fish stocked at the lowest density (3/m3) showed the highest growth rate, and there was no difference between the others. however, final biomass (332, 511 and 703 g/m3) was directly correlated with density. a low density influences positively growth, survival and feed conversion in common snook rearing.
Influência da densidade de estocagem no cultivo de juvenis de robalo-flecha mantidos em laboratório
Souza-Filho José Jer?nimo de,Cerqueira Vinicius Ronzani
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O objetivo deste trabalho foi analisar a influência da densidade de estocagem no crescimento, convers o alimentar e sobrevivência de juvenis de robalo-flecha (Centropomus undecimalis). Os peixes foram coletados em ambiente natural e treinados a aceitar dietas artificiais. Os indivíduos, com comprimento total de 13±0,4 cm e peso de 23±0,3 g foram estocados em tanques circulares de fibra de vidro de 5 m3, com água do mar e aera o contínua, nas densidades de 3, 6 e 9 peixes/m3, por 180 dias. Os valores de am nia total (0 a 0,5 mg/L), temperatura da água (23,3 a 30,6oC), salinidade (17 a 34 g/L), pH (7,8 a 8,4) e oxigênio dissolvido (4,8 a 6,9 mg/L) apresentaram padr o similar entre os tratamentos. A convers o alimentar (1,88, 2,06 e 2,31) e a sobrevivência (100%, 98,9% e 96,3%) foram significativamente melhores nos tratamentos com 3 e 6 peixes/m3. As médias finais de peso (110, 87 e 80 g) e comprimento total (20, 18,5 e 18 cm) apresentaram diferen a significativa. A maior taxa de crescimento foi observada com 3 peixes/m3; entre as demais n o houve diferen a. Entretanto, a biomassa final (332, 511 e 703 g/m3) foi diretamente proporcional à densidade. A baixa densidade favorece o cultivo do robalo em rela o ao crescimento, sobrevivência e convers o alimentar.
Validation of an ovarian biopsy method for monitoring oocyte development in the fat snook, Centropomus parallelus Poey, 1860 in captivity
Ferraz, Eduardo Medeiros;Alvarez-Lajonchère, Luis;Cerqueira, Vinicius Ronzani;Candido, Sidinei;
Brazilian Archives of Biology and Technology , 2004, DOI: 10.1590/S1516-89132004000400018
Abstract: the validation of an ovarian biopsy method for in vivo assessment of oocyte maturation in centropomus parallelus was studied. diameters of intra-ovarian oocytes siphoned with cannula were analyzed fresh and preserved with 1% formalin in 0.7% nacl solution. oocytes in different stages were present along the ovaries, up to the tertiary yolk globule stage, which had a unimodal diameter frequency distribution. the oocyte diameter means were not significantly different at four sites along the ovaries (p > 0.05). samples obtained with cannula were representative of the ovary central portion, in vivo and in vitro samples of the seven females examined were not significantly different (p > 0.05). an estimate of the coefficient of variation corrected for bias (p < 0.05) for 8 repeated in vivo samples was 1.9 ± 0.6. the results demonstrated that for the species, the biopsy method was satisfactory, providing representative samples of the ovaries.
Modality Mix of RFID Regulation
Daniel Ronzani
Journal of International Commercial Law and Technology , 2008,
Abstract: This paper provides a general reflection on how law must manage the evolution of technology. By the example of radio frequency identification (RFID), it analyses the necessity ofRFID regulation based on Lessig’s four modalities law, norms, market and architecture. This paper suggests that a trade-off between or complementing of the four modalities is necessary for a holisticregulation of RFID. To support this claim, various topics of the draft recommendation on the implementation of privacy, data protection and information security principles in RFID applicationsby the European Commission of February 2008 are cross-examined with and attributed to one of the four modalities. This paper concludes that the draft recommendation does not provide precisesupplementing legislation to justify its implementation. Many law-related issues of the draft recommendation can be traded off against or complemented by the other three modalities norms, market and architecture.
A reforma curricular nos cursos de saúde: qual o papel das cren?as?
Ronzani, Telmo Mota;
Revista Brasileira de Educa??o Médica , 2007, DOI: 10.1590/S0100-55022007000100006
Abstract: this article is a theoretical review of the reforms occurring in the curriculum of the health courses. considering the emphasis given by the public policies to an integration of the different levels of health care, the professional training assumes fundamental importance in this process. the curricular reforms however can meet difficulties due to some negative beliefs about the new models for the training or practice of health professionals. thus, this article highlights the importance of evaluating shared beliefs, which tend to strengthen and preserve certain health practices and ideologies. studying these beliefs and actions towards innovating teaching methods based on the proposed changes in the health practices as well as strategies for reforming the graduation courses beyond the formal sphere are pointed out in this paper as effective forms of promoting changes in the behavior of professors, students and health professionals.
Clima organizacional e atividades de preven??o ao uso de risco de álcool
Cruvinel, Erica;Ronzani, Telmo Mota;
Estudos de Psicologia (Campinas) , 2011, DOI: 10.1590/S0103-166X2011000200008
Abstract: the aim of this paper was to evaluate the link between organizational climate and strategies to prevent alcohol consumption, among 97 primary health care professionals. the organizational climate was measured by means of a scale involving the following factors: decision-making, chaos/stress and communication. prevention activities were measured using audit (screening test) and brief interventions carried out in the six-month period following the on-site qualification. the spearman test was used, with a 95% level of confidence, to assess correlation. the results showed a correlation between brief intervention and decision making (p=0.337; p= 0.001) and communication (p=0.281; p=0.005). the number of audits applied were also related to dm (p=0.288; p=0.004) and communication (p=0.215; p=0.035). the results suggest that environments with better perceptions of organizational climate can enhance the prevention of alcohol use in primary health care.
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