Papers by LILIAN CYNARA BARBOZA DA SILVA
Although pacama (Lophiosilurus alexandri), a fish species native to Brazil, is suitable for farmi... more Although pacama (Lophiosilurus alexandri), a fish species native to Brazil, is suitable for farming, it has been little investigated. The present experiment evaluates the effect of food processing on the performance and survival rate of pacama fingerlings. An experiment in a completely randomized design was carried out with 48 pacama fingerlings aged 45 days and weighing 1.94 ± 0.01 g. Fingerlings were assigned to three treatments with four repetitions. Each aquarium containing four fingerlings was considered one experimental unit. Fingerlings were submitted to feed treatments with 47.5% crude protein processed in bran, micro-pellet, and moist forms. The average final weight and apparent feed conversion were significantly (P<0.01) affected by food processing. Pacama fingerlings that fed on moist food performed the best, such that moist food rather than bran or micro-pellet forms is recommended.
Arquivos brasileiros de cardiologia
The papillary fibroelastoma (PFE) is a benign heart tumor, mainly found in the valves. Most tumor... more The papillary fibroelastoma (PFE) is a benign heart tumor, mainly found in the valves. Most tumors are asymptomatic, but when present, they are nonspecific or related to embolic phenomena. They are usually diagnosed at routine imaging studies or valve surgery and autopsies. Its treatment is controversial, due to its rarity. We describe seven PFE cases diagnosed and treated at our institution between 1989 and 2010, which constitutes the largest national case series study of this pathology to date.
Aquaculture Research, 2015
Materials Science Forum, 2014
The production and characterization of porous silicon (PS) samples were studied as well as their ... more The production and characterization of porous silicon (PS) samples were studied as well as their use as substrates to grow boron doped nanocrystalline diamond (NCD) films. PS represents a suitable material for diamond growth due to its large number of nucleation sites and surface area, becoming an excellent material for porous electrodes. NCD films were grown by chemical vapor deposition (CVD) technique by balancing H2/CH4/Ar gas mixture, at two different boron levels. Doping was conducted by an additional hydrogen line passing through a bubbler containing B2O3 dissolved in methanol. Two ratios of boron/carbon were used of 2000 and 20000 ppm in the bubbler solution. Scanning electron microscopy, Raman spectroscopy and X-ray diffraction were used to characterize the films as well as the PS substrate. Results showed that it is possible to obtain NCD films on PS substrate with good quality at different doping levels.
Revista Brasileira de Zootecnia, 2008
Objetivou-se determinar a exigência de fósforo disponível para tilápias-do-nilo. Utilizaram-se 14... more Objetivou-se determinar a exigência de fósforo disponível para tilápias-do-nilo. Utilizaram-se 144 peixes com peso vivo inicial de 35,33 ± 0,66 g, distribuídos em delineamento de blocos ao acaso, com quatro tratamentos e três repetições. Foram fornecidas dietas com 29,0% PB, 2.980 kcal/kg de energia digestível (ED) e quatro níveis de fósforo disponível (0,25; 0,35; 0,45 ou 0,55%), obtidos pela utilização de fosfato bicálcico como fonte de fósforo. As dietas foram fornecidas aos peixes três vezes por dia, até aparente saciedade, durante 46 dias. Não foi observado efeito dos níveis de fósforo disponível na dieta sobre o índice hepatossomático, a taxa de sobrevivência e os teores de água e proteína bruta na carcaça. O aumento dos níveis de fósforo disponível na dieta promoveu aumento linear do ganho de peso médio, da excreção de fósforo e dos teores de cinza na carcaça e de cinzas, cálcio e fósforo nos ossos. Houve efeito quadrático dos níveis de fósforo disponível sobre o consumo de r...
Chemical Speciation & Bioavailability, 2009
Page 1. Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis Rica... more Page 1. Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis Ricardo Soaresa, Manuel Castro Carneiroa, Maria Ine s Couto Monteiroa*, Se´ rgio de Souza Henrique Juniora, Fernanda ...
Chemical Speciation & Bioavailability, 2011
Page 1. Evaluation of the chromium bioavailability in tanned leather shavings using the SM&am... more Page 1. Evaluation of the chromium bioavailability in tanned leather shavings using the SM&amp;amp;amp;amp;T sequential extractions scheme Lılian Irene Dias da Silva, Fernanda Veronesi Marinho Pontes, Manuel Castro Carneiro, Maria Ine ...
Revista Brasileira de Saúde e Produção Animal, 2012
The sex reversal is one of the most important stages for the commercial breeding of Nile tilapia ... more The sex reversal is one of the most important stages for the commercial breeding of Nile tilapia in relation to the problems arising from early breeding of this species in cultivation tanks. The objective was to determine the effect of feeding frequency on growth and sex ratio of Nile tilapia (Oreochromis niloticus) during the sex reversal phase. Five hundred Nile tilapia fry were used and stocked in twenty-five plastic aquaria (36L) in a completely randomized design with five treatments and five replicates. The treatments were: one feeding (10h), two feeding (09h and 17h), three feeding (09h; 13h and 17h), four feeding (07h; 10h; 13h and 17h), and five feeding (07h; 09h; 11h; 15h and 17h). The feeding frequency affected sex ratio of male fingerlings, where the treatments with four and five feedings provided similar values, but higher (P<0.01) than other treatments. It is recommended feeding frequency at least four times a day to provide lots with suitable index of sex reversal f...
Acta Scientiarum. Animal Sciences, 2003
Revista Brasileira de Saúde e Produção Animal, 2013
O pacamã (Lophiosilurus alexandri) é uma espécie de peixe com hábito alimentar carnívoro, apropri... more O pacamã (Lophiosilurus alexandri) é uma espécie de peixe com hábito alimentar carnívoro, apropriada para o cultivo, porém, ainda pouco estudada. O objetivo deste estudo foi determinar a exigência de proteína bruta (PB) do pacamã, L. alexandri, na fase juvenil. O experimento foi conduzido por um período de 45 dias utilizando um delineamento inteiramente casualizado, com cinco tratamentos (dieta contendo 36,2; 38,2; 42,0; 44,4 e 48,8% de PB) e quatro repetições cada, onde 100 juvenis (5,19 ± 0,01g) foram distribuídos em 20 caixas com volume útil de 36 L, sendo considerada como unidade experimental uma caixa com cinco juvenis. Foram avaliados os parâmetros de peso final, percentagem de ganho de peso, taxa de crescimento específico, sobrevivência, índice hepatossomático, rendimento de carcaça com e sem cabeça, comprimento total, comprimento da cabeça, largura e altura. Pela análise de regressão foi verificada uma redução linear (P<0.01) nos parâmetros de desempenho em função do níve...
The Journal of Nutritional Biochemistry, 2015
To examine the effects of creatine (Cr) supplementation on liver fat accumulation in rats fed a c... more To examine the effects of creatine (Cr) supplementation on liver fat accumulation in rats fed a choline-deficient diet. Twenty-four rats were divided into 3 groups of 8 based on 4 weeks of feeding an AIN-93 control diet (C), a choline-deficient diet (CDD) or a CDD supplemented with 2% Cr. The CDD diet was AIN-93 without choline. The CDD significantly increased plasma homocysteine and TNFα concentration, as well as ALT activity. In liver, the CDD enhanced concentrations of total fat (55%), cholesterol (25%), triglycerides (87%), MDA (30%), TNFα (241%) and decreased SAM concentrations (25%) and the SAM/SAH ratio (33%). Cr supplementation prevented all these metabolic changes, except for hepatic SAM and the SAM/SAH ratio. However, no changes in PEMT gene expression or liver phosphatidylcholine levels were observed among the three experimental groups, and there were no changes in hepatic triglyceride transfer protein (MTP) mRNA level. On the contrary, Cr supplementation normalized expression of the transcription factors PPARα and PPARγ that were altered by the CDD. Further, the downstream targets and fatty acids metabolism genes, UCP2, LCAD and CPT1a, were also normalized in the Cr group as compared to CDD-fed rats. Cr supplementation prevented fat liver accumulation and hepatic injures in rats fed with a CDD for 4 weeks. Our results demonstrated that one-carbon metabolism may have a small role in mitigating hepatic fat accumulation by Cr supplementation. The modulation of key genes related to fatty acid oxidation pathway suggests a new mechanism by which Cr prevents liver fat accumulation.
Semina: Ciências Agrárias, 2014
Foi avaliada a digestibilidade aparente dos nutrientes e energia da raspa de mandioca (RM), a far... more Foi avaliada a digestibilidade aparente dos nutrientes e energia da raspa de mandioca (RM), a farinha de resíduo de abate de caprinos/ovinos (FR) e a farinha de feno de maniçoba (FM), para a tilápia do Nilo em rações processadas na forma peletizada e na forma extrusada. Os coeficientes de digestibilidade aparente da proteína e energia brutas para a RM, o FR e a FM em rações peletizadas foram respectivamente 77,97
Revista Brasileira de Zootecnia, 2005
Este estudo foi realizado para se avaliar a redução dos níveis de proteína em dietas para tilápia... more Este estudo foi realizado para se avaliar a redução dos níveis de proteína em dietas para tilápia-do-nilo (5 a 125 g), adotando-se o conceito de proteína ideal. Cento e sessenta peixes (4,40 ± 0,9 g) foram distribuídos em um delineamento inteiramente casualizado, com quatro tratamentos [25,5; 27; 28,5 e 30% (controle) de proteína digestível], três repetições e dez animais por unidade experimental. Os aminoácidos sintéticos foram suplementados para se manter as proporções de aminoácidos de acordo com o conceito de proteína ideal. Os aminoácidos lisina, metionina e treonina foram suplementados para se obter os níveis de aminoácidos da dieta controle. As dietas foram fornecidas à vontade, durante 83 dias. Não foram observados efeitos dos níveis de proteína sobre o ganho de peso, a conversão alimentar, o índice hepatossomático, o peso da gordura visceral, a taxa de sobrevivência, os níveis de proteína na carcaça e o diâmetro da fibra intermediária. O aumento nos níveis de proteína resul...
Revista Brasileira de Zootecnia, 2008
Determinou-se a exigência de fósforo disponível para juvenis de tilápia-do-nilo. Utilizou-se deli... more Determinou-se a exigência de fósforo disponível para juvenis de tilápia-do-nilo. Utilizou-se delineamento em blocos inteiramente casualisados com quatro tratamentos e quatro repetições. Foram fornecidas manualmente, durante 120 dias, dietas com 32% de proteína bruta e 3.050 kcal de energia digestível/kg, suplementadas com fosfato bicálcico de forma a se obterem 0,21; 0,40; 0,56 e 0,71% de fósforo disponível. Não houve efeito dos níveis de fósforo da dieta sobre o consumo, os teores de proteína e extrato etéreo na carcaça e a taxa de mortalidade. Os níveis de proteína e energia digestível tiveram efeito quadrático sobre o ganho de peso, a conversão alimentar, a taxa de eficiência protéica e a porcentagem de cálcio nos ossos, que foram melhores nos níveis 0,55; 0,52; 0,52 e 0,60% de fósforo disponível, respectivamente. Pela análise dos dados pelo modelo de regressão "broken-line" , obteve-se adequada retenção de fósforo nos ossos com 0,64% desse mineral na dieta. A exigência...
Química Nova, 2006
Recebido em 28/10/04; aceito em 20/5/05; publicado na web em 25/11/05 DETERMINATION OF NITROGEN F... more Recebido em 28/10/04; aceito em 20/5/05; publicado na web em 25/11/05 DETERMINATION OF NITROGEN FORMS AND TOTAL NITROGEN IN PETROLEUM RESERVOIR ROCKS BY STEAM DISTILLATION AND THE INDOPHENOL METHOD. Several extraction procedures are described for the determination of exchangeable and fixed ammonium, nitrate + nitrite, total exchangeable nitrogen and total nitrogen in certified reference soils and petroleum reservoir rock samples by steam distillation and indophenol method. After improvement of the original distillation system, an increase in worker safety, a reduction in time consumption, a decrease of 73% in blank value and an analysis without ammonia loss, which could possibly occur, were achieved. The precision (RSD ≤ 8%, n = 3) and the detection limit (9 mg kg-1 NH 4 +-N) are better than those of published procedures.
Química Nova, 2012
Recebido em 8/2/11; aceito em 14/6/11; publicado na web em 5/8/11 SIMULATION OF NATUAL WEATHERING... more Recebido em 8/2/11; aceito em 14/6/11; publicado na web em 5/8/11 SIMULATION OF NATUAL WEATHERING OF ZINC-CARBON AND ALKALINE BATTERIES. Spent alkaline and Zn-C batteries were placed in seawater, rainwater or landfill leachate at room temperature for up 30 days in order to simulate natural weathering. After the experiments pH and electrical conductivity of the liquid were measured. The precipitate formed and the filtrate were submitted to metal analysis by ICP-OES. Seawater is the most corrosive medium, followed by landfill leachate. Pb, Cd and Hg were mainly in the filtrate. Fe, Mn and Zn were generally dominant in the precipitate. Na and K account for the electrical conductivity and are good indicators of the corrosion stage of the batteries.
Journal of the Brazilian Chemical Society, 2010
É proposto um método para determinação de NH 4 +-fixo utilizando um sistema de arraste imerso em ... more É proposto um método para determinação de NH 4 +-fixo utilizando um sistema de arraste imerso em um banho ultrassônico para extração de NH 3 e cromatografia de íons para determinação de NH 4 +. O método é mais rápido, simples e sensível (LOD = 4,4 mg g-1 NH 4 +) que o método clássico Kjeldahl. A method for fixed-NH 4 + determination using a system immersed into an ultrasonic bath for NH 3 extraction and ion chromatography for NH 4 + determination is proposed. The method is faster, simpler and more sensible (LOD = 4.4 mg g-1 NH 4 +) than the classical Kjeldahl method.
Journal of AOAC International, 2013
A fast vacuum-and ultrasound-assisted acid extraction of Co, Cu, Fe, Mn, Pb, and Zn from soils us... more A fast vacuum-and ultrasound-assisted acid extraction of Co, Cu, Fe, Mn, Pb, and Zn from soils using a homemade system has been investigated. Preliminarily, a full factorial design with two levels and three variables (extracting agent, extraction temperature, and sonication time) was applied to optimize the extraction conditions (without vacuum) for some heavy metals (Cu, Mn, Pb, and Zn). The best results were obtained with a 3:1 HCl extraction solution, temperature of 80°C, and time of 2 h. As this sonication time was too long, a vacuum pump was used to produce air bubbles in order to increase the contact between the sample and the extracting agent and to prevent the sample sedimentation. This improvement drastically reduced the sonication time to 2 min. Under these conditions, Co, Cu, Mn, and Zn were totally extracted (recoveries of 86-99%), while recoveries of 73-76 and 74% were obtained for Fe and Pb, respectively. The LOD values using flame atomic absorption spectrometry for determination of Co,
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Papers by LILIAN CYNARA BARBOZA DA SILVA