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Search Results: 1 - 10 of 19748 matches for " RC;Ferreira "
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Larval settlement and spat recovery rates of the oyster Crassostrea brasiliana (Lamarck, 1819) using different systems to induce metamorphosis
Silveira, RC;Silva, FC;Gomes, CHM;Ferreira, JF;Melo, CMR;
Brazilian Journal of Biology , 2011, DOI: 10.1590/S1519-69842011000300029
Abstract: this study aimed at the assessment, in the laboratory, of the larval settlement and spat recovery rates of oysters of the species crassostrea brasiliana using plastic collectors, epinephrine (c9h13no3 c4h6o6) and shell powder in settlement tanks. polypropylene was used attached to bamboo frames. the material was chosen due to its pliability - that favours the spat detachment. two experiments were carried out; the first between february and april 2008, and the second between november and december 2008 at the marine mussel laboratory of santa catarina federal university (laboratório de moluscos marinhos da universidade federal de santa catarina). in the first experiment, the scratched plastic collectors were tested consorting them with shell powder; on the second, the plastic collectors were tested consorted with shell powder, only shell powder and epinephrine as the metamorphosis stimulator. the quantification was carried out of the larvae settled in the plastic collectors, and of the recovery and integrity of the spats after their detachment. the first experiment has shown a recovery rate of 48.83% of the spats in comparison with the d larvae used. from this percentage, 4.9% settled in the plastic collectors and 43.93% in shell powder. the second experiment revealed 55.78% regarding the settled spats in comparison with the total of larvae used (using epinephrine), 78.62% in the treatment with the collector plus shell powder and 58.33% in the treatment only with shell powder. thus, the use of the collector plus shell powder resulted in a greater spat recovery when compared to the other treatments.
Triple bothropic envenomation in horses caused by a single snake
Chiacchio, SB;Martins, GTB;Amorim, RM;Gon?alves, RC;Barraviera, B;Ferreira Junior, RS;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2011, DOI: 10.1590/S1678-91992011000100016
Abstract: in the present study, snakebites caused by a single bothrops pauloensis simultaneously affecting three male adult horses are described. whereas the first two affected horses were six years old, the third was 16 years old; they weighed respectively 555, 550 and 500 kg. all horses presented swollen muzzles. the first animal received an initial antivenom dose of 19 vials and adjuvant medication, it was also subjected to tracheostomy due to the progression of acute respiratory failure. the second and third horses respectively received 15 vials of antivenom each, in addition to adjuvant medication. due to continuous changes in blood coagulation observed during hospitalization, the first and the second horses received five more vials of antivenom, respectively, in the second and third days of treatment. the first animal was discharged on 15th day and the other on the 8th day of hospitalization. several factors including the main actions of bothrops venom (coagulation, proteolytic and vasculotoxic activities), the importance of early diagnosis based on clinical history and clinical examination suggesting the diagnosis of bothrops snakebite, the adequate doses of antivenom, and finally the immediate tracheostomy are herein discussed. the tracheostomy, required to save the life of the first horse, should only occur after the administration of antivenom and control measures for changes in blood coagulation.
Immunoexpression of cyclooxygenase-2 in primary gastric carcinomas and lymph node metastases
Paulo RC Almeida,Francisco VA Ferreira,Cássio C Santos,Francisco D Rocha-Filho
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i8.778
Abstract: AIM: To evaluate immunoexpression of cyclooxygenase-2 (COX-2) in primary gastric carcinomas and respective lymph node metastases. METHODS: Immunohistochemistry to analyze COX-2 expression was performed on tissue microarray slices obtained from 36 specimens of gastrectomy and satellite lymph nodes from patients with gastric carcinoma. RESULTS: Immunostaining was seen in most cases, and COX-2 expression was higher in lymph node metastases than in corresponding primary gastric tumors of intestinal, diffuse and mixed carcinomas, with a statistically significant difference in the diffuse histotype (P = 0.0108). CONCLUSION: COX-2 immunoexpression occurs freq- uently in primary gastric carcinomas, but higher expression of this enzyme is observed in lymph node metastases of the diffuse histotype.
Potent hepatoprotective effect in CCl4-induced hepatic injury in mice of phloroacetophenone from Myrcia multiflora
EA Ferreira, EF Gris, KB Felipe, JF Gomes Correia, E Cargnin-Ferreira, DW Filho, RC Pedrosa
Libyan Journal of Medicine , 2010,
Abstract: Background: This study investigated the hepatoprotective effect and antioxidant properties of phloroacetophenone (2',4',6'-trihydroxyacetophenone - THA), an acetophenone derived from the plant Myrcia multiflora. Material & Method: The free radical scavenging activity in vitro and induction of oxidative hepatic damage by carbon tetrachloride (CCl4) (0.5 ml/kg, i.p.) were tested in male Swiss mice (2595 g). Results: This compound exhibited in vitro antioxidant effects on FeCl2-ascorbate-induced lipid peroxidation (LPO) in mouse liver homogenate, scavenging hydroxyl and superoxide radicals, and 2,2-diphenyl-1-picrylhydrazyl. The in vivo assays showed that THA significantly (p<0.01) prevented the increases of hepatic LPO as measured by the levels of thiobarbituric acid-reactive substances, mitochondrial swelling. It also protected hepatocytes against protein carbonylation and oxidative DNA damage. Consistent with these observations, THA pre-treatment normalized the activities of antioxidant enzymes, such as catalase, glutathione peroxidase, and superoxide dismutase, and increased the levels of reduced glutathione (GSH) in CCl4-treated mice. In addition, THA treatment significantly prevented the elevation of serum enzymatic activities of alanine amino transferase, aspartate amino transferase, and lactate dehydrogenase, as well as histological alterations induced by CCl4. Silymarin (SIL) (24 mg/kg), a known hepatoprotective drug used for comparison, led to a significant decrease (p<0.01) in activities of theses enzymes in way very similar to that observed in pre-treatment with THA. Conclusion: These results suggest that the protective effects are due to reduction of oxidative damage induced by CCl4 resulting from the antioxidant properties of THA.
Side effects of selection in laboratory animals
RC Roberts
Genetics Selection Evolution , 1978, DOI: 10.1186/1297-9686-10-1-143b
Abstract:
Europe: history, current situation and control measures for infectious bronchitis
Jones, RC;
Revista Brasileira de Ciência Avícola , 2010, DOI: 10.1590/S1516-635X2010000200009
Abstract: the emergence and nature of different strains of infectious bronchitis virus (ibv) in europe are described. infectious bronchitis (ib) is the most important endemic viral respiratory disease where highly pathogenic newcastle disease and avian influenza are not present. ib was first described in the uk in 1948 and identified as massachusetts type. in the 1970s and 80s new serotypes were reported in holland and elsewhere and new vaccines were developed. the 1990s saw the emergence of the major variant commonly called 793b, again needing a new vaccine. two novel types have been recognised since 2000, italy 02 and qx. italy 02 appears to be well controlled by the use of two different live vaccines (h120 and the 793b-related 4/91) while for qx, associated with nephritis in young birds and silent layers, new vaccines are in development. the use of two vaccines as above is a widely used protocol and is capable of protecting against a wide range of different types. alternative approaches to ib vaccination are discussed. the importance of constant surveillance for prevalent and novel ibv types is emphasised and the value of experimental infections in chickens to determine the pathogenesis and pathology of new types in addition to testing efficacy of vaccines is outlined.
Parametric analysis of rail vehicle parameters influencing ride behavior
RC Sharma
International Journal of Engineering, Science and Technology , 2011,
Abstract: This paper presents the influence of rail vehicle parameters on vertical and lateral ride behavior. The analysis considers coupled vertical-lateral 37 degrees of freedom mathematical model of an Indian Railway General Sleeper ICF coach formulated using Largangian dynamics. Both vertical and lateral irregularities of the railway track, considered as random function of time are incorporated in analysis. The ride analysis of the mathematical model suggests that discomfort frequency range lies from 4 to 10.5 Hz and improvements in the design of rail vehicle coach are required for better ride comfort. It is seen from parametric analysis that car body mass, secondary suspension vertical damping, primary suspension vertical damping and wheel base are the most sensitive parameters influencing vertical ride. While lateral ride is significantly influenced by car body mass, roll & yaw mass moment of inertia and secondary suspension lateral stiffness.
The ageing eye
RC Amod
Continuing Medical Education , 2007,
Abstract:
Zooplankton biomass to chlorophyll ratios in relation to trophic status within and between ten South African reservoirs: Causal inferences, and implications for biomanipulation
RC Hart
Water SA , 2011,
Abstract: Rising eutrophication in South African reservoirs is of major concern, leading to the consideration of top-down biomanipulation as a management option – reducing zooplankton-eating fish to sustain zooplankton grazing pressure and thus restrict autotrophic plankton that proliferate with nutrient increases. The biomass ratio of zooplankton to phytoplankton (ZB/PB) is used as an index of the likely value of biomanipulation to achieve this outcome, but values have not been explored for South African systems. Using chlorophyll (Chl) as a surrogate for PB, available ZB/Chl data are assembled for the first time for ten reservoirs of three types (minerally-turbid systems, oligo/mesotrophic clear water systems, and eutrophic/hypertrophic systems), and the results are discussed in relation to a generalised conceptual model proposed. With the exception of one minerally-turbid system, ZB/Chl values decline quasi-exponentially with rising chlorophyll within individual reservoirs. Conversely, between individual systems, median (or mean) values of ZB/Chl conversely increase rather than decline with rising trophic status – broadly contradicting observations reported elsewhere. Underlying causal reasons for the observed pattern and its implications for biomanipulation are considered. This assessment evaluates: the negative impacts of general declines in food quality that stem from rising eutrophication on zooplankton feeding ability and resulting seasonal changes in ZB and community structure; prospects of food sources other than living autochthonous autotrophs in sustaining ZB between systems; and inferences about fish predation pressure on zooplankton, derived from empirical data regarding the large body sizes of species and individuals of Daphnia that occur in the reservoirs. Observed increases in median ZB/Chl ratios with rising nutrient status are consistent with the inference that obligate visual zooplanktivorous fishes are scarce or absent, particularly in eutrophic reservoirs, suggesting that biomanipulative management is unlikely to assist in controlling the consequences of nutrient enrichment in local reservoirs.
Access to adequate water in post-apartheid South African provinces: An overview of numerical trends
RC Nnadozie
Water SA , 2011,
Abstract: This paper presents an insight into water service access and demand, with a numerical review of official data from the national household survey from 1995 to 2006, and the 1996 and 2001 census data. The findings show that in provinces (Eastern Cape, Limpopo and Mpumalanga) where the existing service base is low, with a relatively high level of outmigration leading to a decrease in household numbers, the annual rate of delivery is lower than in other areas and percentage access has risen marginally (from about 68% to 70%). In provinces (North West, Northern Cape and KwaZulu-Natal) where the existing service base is higher, with relatively lower levels of out-migration, there is a marginal change in household numbers and the annual rate of delivery is higher and percentage access has risen remarkably (from about 72% to 88%). In the provinces (Gauteng, Western Cape and Free State) with the most favourable initial conditions, that is, where the existing service base is the highest, there is a remarkable change in household numbers, possibly as a result of in-migration and the annual rate of delivery is quite sustainable. Percentage access rises at an early stage and remains stable at the limiting value of about 98%.
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