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Search Results: 1 - 10 of 2853 matches for " Helen;Luccio "
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Esteriliza??o de farinha de subprodutos animais em esterilizador industrial
Mazutti, Marcio Ant?nio;Treichel, Helen;Di Luccio, Marco;
Ciência e Tecnologia de Alimentos , 2010, DOI: 10.1590/S0101-20612010005000003
Abstract: animal meal obtained from animal offal offers a fairly complete source of most of the aminoacids required for a balanced animal diet. these products are used to correct nutritional deficiencies of other foodstuffs used in animal feed, such as vegetable feeds. however, animal meal is a good source for microorganism growth during processing or storage. a government regulation proposes that a stage of feed sterilization could be carried out before cooking the animal byproducts (offal, feathers, etc.) or even of the meal itself, considering that if direct saturated steam is used, the minimum temperature should be 133 °c, for a minimum of 20 minutes, or if dry heat is used the meal should be exposed to a dry heat of 140 °c for a minimum of 3 hours. in industry, a final product that meets both the sanitary standards and high protein content is required. in this context, this work aimed to study different strategies for processing meal prepared from byproducts of poultry slaughterhouses, searching for the most effective technique for sterilization: whether pre-digestion or sterilization of the meal itself. industrial (3,000 kg) and pilot (150 kg) plant tests were carried out. sterilization on an industrial scale presented a better performance than the pilot plant tests. protein content increased in all tests and the final digestibility of the meal was approximately 92 per cent, which increases its final market value. the industrial process was effective removing microorganisms, since no count was detected in the meal after any of the tests.
Head Space Solid Phase Micro-Extraction (HS - SPME) of volatile organic compounds produced by Sporidiobolus salmonicolor (CBS 2636)
Valduga, Eunice;Valerio, Alexsandra;Treichel, Helen;Nascimento Filho, Irajá;Fúrigo Júnior, Agenor;Di Luccio, Marco;
Ciência e Tecnologia de Alimentos , 2010, DOI: 10.1590/S0101-20612010000400023
Abstract: the aim of the present study was the assessment of volatile organic compounds produced by sporidiobolus salmonicolor (cbs 2636) using methyl and ethyl ricinoleate, ricinoleic acid and castor oil as precursors. the analysis of the volatile organic compounds was carried out using head space solid phase micro-extraction (hs - spme). factorial experimental design was used for investigating extraction conditions, verifying stirring rate (0-400 rpm), temperature (25-60 oc), extraction time (10-30 minutes), and sample volume (2-3 ml). the identification of volatile organic compounds was carried out by gas chromatography with mass spectrum detector (gc/msd). the conditions that resulted in maximum extraction were: 60 oc, 10 minutes extraction, no stirring, sample volume of 2.0 ml, and addition of saturated kcl (1:10 v/v). in the bio-production of volatile organic compounds the effect of stirring rate (120-200 rpm), temperature (23-33 oc), ph (4.0-8.0), precursor concentration (0.02-0.1%), mannitol (0-6%), and asparagine concentration (0-0.2%) was investigated. the bio-production at 28 oc, 160 rpm, ph 6,0 and with the addition of 0.02% ricinoleic acid to the medium yielded the highest production of vocs, identified as 1,4-butanediol, 1,2,2-trimethylciclopropilamine, beta-ionone; 2,3-butanodione, pentanal, tetradecane, 2-isononenal, 4-octen-3-one, propanoic acid, and octadecane.
Pré-tratamentos de mela?o de cana-de-a?úcar e água de macera??o de milho para a bioprodu??o de carotenóides
Valduga, Eunice;Valério, Alexsandra;Treichel, Helen;Luccio, Marco Di;Jacques, Rosangela Assis;Fúrigo Júnior, Agenor;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000800012
Abstract: this work studied the pretreatment of sugarcane molasses (cm) and corn steep liquor (cs) for the production of carotenoids by sporidiobolus salmonicolor (cbs 2636). the acid pretreatment removed less micronutrients than that with activated carbon and led to high removals of cu and mn. reduction in optical density of the prepared medium and removal of glucose from it were 22% and 7% for cm and 95% and 38% for cs, respectively. total carotenoids obtained with substrates pretreated with acids (541 mg/l) were higher than the results obtained when the medium was treated with activated carbon (208 mg/l).
Arithmetic for Rooted Trees
Fabrizio Luccio
Computer Science , 2015,
Abstract: We propose a new arithmetic for rooted unordered trees of n vertices and a method for their enumeration. We define three arithmetic operations on trees called addition, addition-plus, and multiplication and show how all trees can be generated by addition and addition-plus from a starting tree proving that both operations are needed. We show how a given tree can be obtained as the sum, sum-plus, or product of two trees, thus defining prime trees with respect to the three operations, and prove that primality can be decided in time polynomial in n. We suggest how these concepts can be useful and discuss the two lines of similar studies appeared in the literature
Production and partial characterization of lipase from Penicillium verrucosum obtained by submerged fermentation of conventional and industrial media
Pinheiro, Thaís da Luz Fontoura;Menoncin, Silvana;Domingues, Natália Molossi;Oliveira, Débora de;Treichel, Helen;Di Luccio, Marco;Freire, Denise Maria Guimar?es;
Ciência e Tecnologia de Alimentos , 2008, DOI: 10.1590/S0101-20612008000200028
Abstract: the growing interest in lipase production is related to the potential biotechnological applications that these enzymes present. current studies on lipase production by submerged fermentation involve the use of agro-industrial residues aiming at increasing economic attractiveness. based on these aspects, the objective of this work was to investigate lipase production by penicillium verrucosum in submerged fermentation using a conventional medium based on peptone, yeast extract, nacl and olive oil, and an industrial medium based on corn steep liquor, prodex lac (yeast hydrolysate), nacl and olive oil, as well as to characterize the crude enzymatic extracts obtained. kinetics of lipase production was evaluated and the highest enzymatic activities, of 3.15 and 2.22 u.ml-1, were observed when conventional and industrial media were used, respectively. the enzymatic extract showed optimal activity in the range from 30 to 40 °c and at ph 7.0. although the industrial medium presents economical advantages over the conventional medium, the presence of agro-industrial residues rich in nitrogen and other important nutrients seemed to contribute to a reduction in lipase activity.
Imobiliza??o de lipases produzidas por fermenta??o em estado sólido utilizando Penicillium verrucosum em suportes hidrofóbicos
Menoncin, Silvana;Domingues, Natalia Molossi;Freire, Denise Maria Guimar?es;Oliveira, José Vladimir;Di Luccio, Marco;Treichel, Helen;Oliveira, Débora de;
Ciência e Tecnologia de Alimentos , 2009, DOI: 10.1590/S0101-20612009000200033
Abstract: the major interest in the immobilization of enzymes is obtaining a biocatalyst with activity and stability that are not affected during the process when compared to the free enzyme. the application of lipases in industries requires the study of techniques suitable for reuse and stability increase such as immobilization strategies. this work studied the immobilization of lipases produced by solid state fermentation from penicillium verrucosum using two hydrophobic supports: accurel ep 1000 and activated carbon. for the lipase immobilization, 1 g of support was added to 50 ml of an enzyme solution and kept for 2 hour in an ice bath. the solution was then filtered and the immobilized enzyme was stored in a dissecator for 48 hour before the assays for lipase activity, protein, and specific lipase activity. the results showed that the lipase immobilized in activated carbon presented higher specific activity than the lipase immobilized in accurel ep 1000. the use of activated carbon as support led to a specific activity of 1.5 × 106 u/mg of protein, yield of 30.42%, and retention of 382.516%.
Formula??o de bebida láctea fermentada sabor pêssego utilizando substratos alternativos e cultura probiótica
Kempka, Aniela Pinto;Krüger, Roberta Letícia;Valduga, Eunice;Di Luccio, Marco;Treichel, Helen;Cansian, Rogério;Oliveira, Débora de;
Ciência e Tecnologia de Alimentos , 2008, DOI: 10.1590/S0101-20612008000500027
Abstract: nowadays, new food products are launched in the market, and the main focus of the dairy industry is on functional products. thus, the first objective of this work was to develop a fermented dairy drink with probiotic characteristics. furthermore, milk serum and soy hidrosoluble extract were used as substrates increasing the value of low cost raw materials that have functional features, as reported in the literature. based on these aspects, an experimental design was used to investigate the formulation of a peach- flavored dairy drink using milk serum, cow milk and soy hidrosoluble extracts. the formulation with 30% of soy hidrosoluble extract, 36.6% of cow milk and 33.3% of milk serum was found as ideal in terms of sensorial analysis and cell growth evaluation. organoleptical, physicochemical, and microbiological analyses determined the shelf life of the product. during the storage period, the peach- flavored dairy drink presented viable cells according to the legislation (1 x 106 ufc.ml-1) for 22 days. the physicochemical quality changed slightly since the acidity presented high values after the 22nd day. the sensorial quality defined the shelf life as 14 days without the addition conservants due to the high acidity value of the fermented dairy drink determined.
Produ??o de carotenoides: microrganismos como fonte de pigmentos naturais
Valduga, Eunice;Tatsch, Pihetra Oliveira;Tiggemann, Lídia;Treichel, Helen;Toniazzo, Geciane;Zeni, Jamile;Di Luccio, Marco;Fúrigo Júnior, Agenor;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000900036
Abstract: carotenoids are natural dyes synthesized by plants, algae and microorganisms. application in many sectors can be found, as food dyeing and supplementation, pharmaceuticals, cosmetics and animal feed. recent investigations have shown their ability to reduce the risks for many degenerative diseases like cancer, heart diseases, cataract and macular degeneration. an advantage of microbial carotenoids is the fact that the cultivation in controlled conditions is not dependent of climate, season or soil composition. in this review the advances in bio-production of carotenoids are presented, discussing the main factors that influence the microbial production of these dyes in different systems.
Do Iluminismo à Web semantica: reflex es sobre a comunica o com base em uma única língua
Flavia Di Luccio
Psicologia Clínica , 2010, DOI: 10.1590/s0103-56652010000200015
Chain Rotations: a New Look at Tree Distance
Fabrizio Luccio,Linda Pagli
Computer Science , 2012,
Abstract: As well known the rotation distance D(S,T) between two binary trees S, T of n vertices is the minimum number of rotations of pairs of vertices to transform S into T. We introduce the new operation of chain rotation on a tree, involving two chains of vertices, that requires changing exactly three pointers in the data structure as for a standard rotation, and define the corresponding chain distance C(S,T). As for D(S,T), no polynomial time algorithm to compute C(S,T) is known. We prove a constructive upper bound and an analytical lower bound on C(S,T) based on the number of maximal chains in the two trees. In terms of n we prove the general upper bound C(S,T)<= n-1 and we show that there are pairs of trees for which this bound is tight. No similar result is known for D(S,T) where the best upper and lower bounds are 2n-6 and 5n/3-4 respectively.
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