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Search Results: 1 - 10 of 192549 matches for " Mario de Andrade;Rocha "
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Deposi??o e acúmulo de matéria seca e nutrientes em serapilheira em um bosque de sabiá (Mimosa caesalpiniifolia Benth.)
Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Rocha, Mallon Sampaio da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Barreto, Levy Paes;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000100002
Abstract: quantification of litter deposition and organic mantle accumulation are important steps on nutrient cycling studies. this study aimed to quantify litter deposition and organic mantle in a sabiá (mimosa caesalpiniifolia benth) woodlot in an experimental farm in the brazilian northeast region. twenty 0.50 x 0.50 x 0.15 m wood collectors, to quantify litter deposition, were systematically distributed over the area elevated 30 cm above the soil. deposited material was collected monthly from october 2000 to september 2001, and separated into leaves, twigs, flowers, pods and mixed portions. undecomposed organic mantle was randomly sampled nearby collector boxes, to a total of 20 monthly samples, from which a 0.30 x 0.30 m composed sample was collected. the collected material was also hand separated into leaves, twigs, flowers, pods and mixed portions. all collected material was dried at 60°c until constant weight was achieved. highest monthly litter deposition and leaf and pod fractions occurred in october, probably due to initiation of dry period. litter deposition and stock were estimated at 7830.44 kg.ha-1.year-1 and 8906.9 kg.ha-1, respectively, with the leaf fraction dominating. leaf fraction was the richest in nutrient content.
Proposal of a Methodology for the Assessment of Security Levels of IoT Wireless Sensor Networks in Nuclear Environments  [PDF]
Marcia Maria Savoine, Mario Olimpio de Menezes, Delvonei Alves de Andrade
World Journal of Nuclear Science and Technology (WJNST) , 2018, DOI: 10.4236/wjnst.2018.82008
Abstract: The use of Wireless Sensor Networks (WSN) associated with the reality of an Internet of Things (IoT) scenario in nuclear environments is a growing security concern. In this context, standards are intensified to preserve the physical integrity of these facilities considered to be highly critical due to the size of the impacts of safety accidents. This paper presents a proposal to build a methodology to evaluate the security levels of WSNs with IoT devices when used in nuclear areas. The proposal is initially based on related work to establish a more concrete initial framework and is structured in consistent steps from previous scientific studies.
The Dengue Vector Aedes aegypti Contains a Functional High Mobility Group Box 1 (HMGB1) Protein with a Unique Regulatory C-Terminus
Fabio Schneider Ribeiro, Isabel Caetano de Abreu da Silva, Vitor Coutinho Carneiro, Fabrício dos Santos Belgrano, Ronaldo Mohana-Borges, Ivone de Andrade Rosa, Marlene Benchimol, Nathalia Rocha Quintino Souza, Rafael Dias Mesquita, Marcos Henrique Ferreira Sorgine, Felipe Gazos-Lopes, Amanda Roberta Revoredo Vicentino, Wenjie Wu, Renata de Moraes Maciel, Mario Alberto Cardoso da Silva-Neto, Marcelo Rosado Fantappié
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040192
Abstract: The mosquito Aedes aegypti can spread the dengue, chikungunya and yellow fever viruses. Thus, the search for key molecules involved in the mosquito survival represents today a promising vector control strategy. High Mobility Group Box (HMGB) proteins are essential nuclear factors that maintain the high-order structure of chromatin, keeping eukaryotic cells viable. Outside the nucleus, secreted HMGB proteins could alert the innate immune system to foreign antigens and trigger the initiation of host defenses. In this work, we cloned and functionally characterized the HMGB1 protein from Aedes aegypti (AaHMGB1). The AaHMGB1 protein typically consists of two HMG-box DNA binding domains and an acidic C-terminus. Interestingly, AaHMGB1 contains a unique alanine/glutamine-rich (AQ-rich) C-terminal region that seems to be exclusive of dipteran HMGB proteins. AaHMGB1 is localized to the cell nucleus, mainly associated with heterochromatin. Circular dichroism analyses of AaHMGB1 or the C-terminal truncated proteins revealed α-helical structures. We showed that AaHMGB1 can effectively bind and change the topology of DNA, and that the AQ-rich and the C-terminal acidic regions can modulate its ability to promote DNA supercoiling, as well as its preference to bind supercoiled DNA. AaHMGB1 is phosphorylated by PKA and PKC, but not by CK2. Importantly, phosphorylation of AaHMGB1 by PKA or PKC completely abolishes its DNA bending activity. Thus, our study shows that a functional HMGB1 protein occurs in Aedes aegypt and we provide the first description of a HMGB1 protein containing an AQ-rich regulatory C-terminus.
Factors affecting the student evaluation of teaching scores: evidence from panel data estimation
Andrade, Eduardo de Carvalho;Rocha, Bruno de Paula;
Estudos Econ?micos (S?o Paulo) , 2012, DOI: 10.1590/S0101-41612012000100005
Abstract: we use a random-effects model to find the factors that affect the student evaluation of teaching (set) scores. dataset covers 6 semesters, 496 undergraduate courses related to 101 instructors and 89 disciplines. our empirical findings are: (i) the class size affects negatively the set score; (ii) instructors with more experience are better evaluated, but these gains reduce over time; (iii) participating in training programs, designed to improve the quality of teaching, did not increase the set scores; (iv) instructors seem to be able to marginally 'buy' a better evaluation by inflating students' grade. finally, there are significant changes in the rankings when we adjust the set score to eliminate the effects of variables beyond instructors' control. despite these changes, they are not statistically significant.
The Use of Exoskeletons of Shrimp (Litopenaeus vanammei) and Crab (Ucides cordatus) for the Extraction of Chitosan and Production of Nanomembrane  [PDF]
Sania M. B. de Andrade, Rasiah Ladchumananandasivam, Brismak G. da Rocha, Débora D. Belarmino, Alcione O. Galv?o
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.37070
Abstract: Chitin is widely distributed in nature, being the main structural component of the exoskeleton of crustaceans and is non-toxic, biodegradable and biocompatible. These exoskeletons once discarded become an industrial waste creating environmental pollutant. In order to find an alternative use, the present work exploits the extraction of the chitosan from chitin that is present in the exoskeletons of shrimps Litopenaeus vannamei and crabs Ucides cordatus and transforms it into high valued products, which can help solving the environmental problem as well to provide extra income to the fishermen. One example is the manufacture of nanomembranes from chitosan for the application in medical textiles. Nanomembranes using electrospinning of chitosan solutions (7% and 5wt%) with 100:0 v/v (TFA/DCM) and 70:30 v/v (TFA/DCM) were produced. Morphological properties of chitin and chitosan were studied using SEM, DRX, and thermal properties through TG/DTG and molecular structure by FTIR analysis. TG/DTG showed thermal decomposition of chitosan samples. X-ray diffraction analysis indicated the semi-crystalline structure of chitosan, and highly crystalline structure for chitin. Morphologies of the nanomembranes were also observed from scanning electron micrographs. Results showed that the nanomembranes with 5% chitosan solutions with 70:30 v/v (TFA/DCM) showed facilitation in the formation of the nanomembranes. The nanomembranes of shrimp and crab with 5% 70:30 v/v (TFA/DCM) had higher breaking tension and breaking extension. With positive results obtained, the present work will help the authorities to organize the fishermen to have consciousness in the collection of exoskeleton waste as well as helping to have a better environment.
Etnobotanica nordestina: estudo comparativo da rela??o entre comunidades e vegeta??o na Zona do Litoral - Mata do Estado de Pernambuco, Brasil
Silva, Alberto Jorge da Rocha;Andrade, Laise de Holanda Cavalcanti;
Acta Botanica Brasilica , 2005, DOI: 10.1590/S0102-33062005000100006
Abstract: the objective of this work is to determine the social behaviour concerning the consumption of vegetal species by local communities. the involved localities are: the usina s?o josé (igarassu - ig), which involves rural communities in the surroundings of the ecological reserve of the usina s?o josé and the jaguarana (paulista - pe), an urban settlement located in the neighbourhoods of the ecological reserve of jaguarana. structured interviews were applied to these social groups, addressing 38 people, in order to identify the most useful plants and the correspondent use. these were classified into categories food, commerce, constrution, ritualistic, medicinal, technological and "others". among these types, 334 native and introduced species were registered. the different communities were analysed and compared through the s?rensen similarity quotient (qs). the higher incidence is of feeding plants (qsigpa= 0.71), predominantly cropped and medical plants (qsigpa= 0.56), from which 45.1% are natives and herbaceous. the native vegetation constitutes an important source of medicines. however, it has no relevance as food within the cosmological view of the community. vegetables are irrelevant as timber in the trade sector, for income generation (qsigpa= 0.30). for building proposals most species are native (87.8%) and tree (92.7%). for technological purpose the native species (85.7%) and the tree/shrub (84.1%), are the most representative category. the communities use different types of vegetal resource for the construction, ritualistic and technology among other categories, as a result of their main activities and of the available natural resources.
Investiga??o sobre a identidade profissional em alunos de Licenciatura em Ciências Bioló gicas
Brando, Fernanda da Rocha;Caldeira, Ana Maria de Andrade;
Ciência & Educa??o (Bauru) , 2009, DOI: 10.1590/S1516-73132009000100010
Abstract: the current research presents the professional perspectives of the students majoring in biological science in a public university of s?o paulo state. the students' perspectives related to that course, have been identified by means of semi structured interviews looking at the identity they have formed as part of how they imagine the ethos of biology. we have verified that the course which has been surveyed, has contributed little to the construction of identification by the students with the job of biology or science teaching. despite that, the course aims at such a formation of teachers, and it highlights the formation of an image of the scientist-researcher in the basic field areas of biology.
Implica??es nutricionais e sensoriais da polpa e casca de baru (Dipterix Alata vog.) na elabora??o de p?es
Rocha, Lorena Santana;Cardoso Santiago, Raquel de Andrade;
Ciência e Tecnologia de Alimentos , 2009, DOI: 10.1590/S0101-20612009000400019
Abstract: interest in new sources of nutrients and the need of preserving native species of the savanna, through their valorization, motivates the study of their potential for supplementing products. the objective of this study was to investigate the feasibility of using the peel and pulp of the baru to develop sliced bread and the consequent nutritional and sensory implications. in the process of developing whole wheat sliced bread, oat bran was replaced for baru's peel and pulp using four proportions (25, 50, 75, and 100%). the analysis of the chemical composition of baru's peel and pulp resulted in 21.05% moisture, 65.01% carbohydrates, 3.30% lipids, 4.45% protein, 1.79% ash, and 4.39% crude fiber. all samples were accepted considering the attributes appearance, texture, and flavor. they were considered low in total fat (2.18%), showed no significant difference regarding the content of protein (13.59%) and moisture (34.54%). it presented an average content of carbohydrate of 41.90 and 1.76% of ash. there was an increase of up to 58.20% in the total content of the dietary fiber with the increase of the proportion of baru's peel and pulp. the results indicate that the peel and pulp of baru viable ingredients in the technology application to prepare whole wheat sliced bread improving nutritional characteristics and sensory attributes.
Isospora belli en los pacientes con SIDA: Natal/Brasil
Parasitología latinoamericana , 2002, DOI: 10.4067/S0717-77122002000300014
Abstract: one of the major health problems among hiv seropositive patients is superimposed infection due to the defect of immunity. furthermore, intestinal parasite infection, for example, isospora belli. the infection for this parasite is more frequent in tropical and sub-tropical climate areas. in the brazil studies they were accomplished in ribeir?o preto/sp′s city, rio de janeiro/rj, santos/sp e campinas/sp, which presented high levels of isosporosis. in this study, 422 feces stool examination was performed and the patients were screened for a history of diarrhea, which was defined as loose stool occurring more than three times a day and interns in the giselda trigueiro hospital in the natal city - brazil, which revealed a distribution of 13.3% of the i. belli compared to the data of africa countries (8 -20%), probably due to the humid climate and the satisfactory few resources found in these areas
Química atmosférica do enxofre (IV): emiss?es, rea??es em fase aquosa e impacto ambiental
Martins, Cláudia Rocha;Andrade, Jailson Bittencourt de;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000200015
Abstract: the oxidation process of sulfur(iv) species by oxygen, ozone and nitrogen oxides, catalysed by trace metal ions, can play an important role in atmospheric chemistry processes like acid rain, visibility degradation and health hazard. an overview of the more relevant investigations on emissions sources, aqueous phase conversion process and environmental impact is presented.
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