Federal University of Roraima

About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.

Chemical composition and multivariate analysis of the volatile oil of Dalbergia frutescens (Vell.) Britton (Fabaceae)

Abstract: The chemical composition of the volatile oil from the leaves of three specimens of D. frutescens, collected over a period of one year, was determined by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detection (GC-FID). These essential oils were characterized by the presence of norisoprenoids (β-damascenone, β-ionone, and α-ionone), as well as sesquiterpenes. Multivariate analysis showed that the compounds β-damascenone and β-ionone exerted the greatest influence on spatial and temporal differences in the composition of the oils. Samples obtained from specimens located in the same city showed similar chemical compositions.

Envenoming by the rattlesnake Crotalus durissus ruruima in the state of roraima, Brazil.

Abstract: The aim of this study was to evaluate the clinical-epidemiological factors associated with victims of rattlesnake envenoming in the state of Roraima, Brazil. In this location, rattlesnake accidents are caused by the subspecies Crotalus durissus ruruima. This is a prospective observational study carried out at the General Hospital of Roraima from april 2017 until july 2018. A total of 37 alleged rattlesnake victims had their medical records evaluated. However only one of them proved to be by C. d. ruruima. All individuals were residents from the savannas (lavrados) of Roraima. The town of Bonfim on the border between Brazil and Guyana had the highest occurrence of rattlesnake bites. The most affected group were males aged 13–20 years and farmers. The highest number of incidents occurred during daytime and lower limbs (feet) were the most major affected part of the body. Tourniquets were used as first aid after snake envenoming in 32.4% of victims. Out of 37 patients, 16.2% were classified as severe cases of snakebite envenoming and in 5.4% dry bites seem to have occurred. Among the symptomatic patients, 100% presented local manifestations and 70.3% presented systemic manifestations. The clinical setting showed local effects such as pain and edema while the systemic effects were blurred vision, myalgias, myasthenic facies, palpebral ptosis, muscle weakness and headache. Laboratory results of aspartate aminotransferase (62.2%), creatine phosphokinase (51.3%), lactic dehydrogenase (37.8%), urea level (32.4%) and serum creatinine (29.7%) were increased significantly in relation to the reference standards. In 16.2% of the cases, the victims presented acute kidney injury. Patients were treated with anticrotalic serum in 70.3% of the cases and antibotropic + anticrotalic serum in 24.3%. The victims of C. d. ruruima in Roraima showed a local symptomatology similar to Bothrops envenoming, while systemic symptoms and laboratory analysis proved kidney and muscular injuries, similar to envenoming by Crotalus d. terrificus in Brazil.

Trajetórias escolares de pessoas com deficiências na educação básica: qual lugar da educação especial?

Abstract: The present work analyzes the school trajectories of people with disabilities in basic education, focusing on the schooling process. This is a research conducted with the methodology of oral history applied to four people with disabilities (blindness, deafness and physical disability), through semi-structured interviews and use of content analysis. The study is based on the perspective of Historical-Cultural Theory. The results indicate that the school is fundamental to ensure the schooling of the subject with disabilities, including social overcompensation is one of the elements that contribute to the completion of basic education and, later, access to higher education. Therefore, the school trajectory of people with disabilities shows that the right to education, through teaching based on mediation and development of higher psychological functions, is essential in ensuring their educational training.

Medindo associação implícita com o freeIAT em Português: um exemplo com atitudes implícitas frente ao poliamor

Abstract: O Teste de Associacao Implicita (TAI) tem se mostrado relevante na medicao de diversos construtos psicologicos. Entretanto, sao escassos os estudos que o consideram no Brasil. Este artigo objetivou introduzir um programa gratuito (FreeIAT) para sua realizacao, exemplificando com uma medida de atitudes frente ao poliamor. Participaram da pesquisa 50 estudantes universitarios com idade media de 22 anos (62% mulheres), que responderam a uma escala de atitudes explicitas frente ao poliamor e ao TAI Monogamia-Poliamor. Os resultados mostraram correlacao negativa entre a medida implicita (bloco de latencia incongruente) e a explicita de atitudes frente ao poliamor, indicando que quanto maior a aceitacao do poliamor, menor o tempo de associacao entre os estimulos (palavras positivas e poliamor). Nao se observou correlacao entre o Escore D e as atitudes explicitas frente ao poliamor, sugerindo que pessoas favoraveis ao poliamor nao necessariamente sao contrarias a monogamia. Concluiu-se que o FreeIAT possui uma interface simplificada, atendendo as variacoes do TAI classico e permitindo aplicacao coletiva. Alem disso, o fato de ser um programa com codigo aberto e gratuito tem o potencial de incentivar pesquisas com medidas implicitas em culturas lusofonas.

Effect of Gold Nanoparticles and Unwanted Residues on Raman Spectra of Graphene Sheets

Abstract: We report the effect of gold nanoparticles (AuNPs) and unwanted sodium citrate residues (UnR) left after deposition of AuNPs by drop-casting method on the Raman spectra of graphene sheets (GS). The AuNPs solution was deposited on three different substrates: 5.0 wt% Yb3+-doped (Q5) phosphate glass, silica glass (S1), and Si/SiO2-300 nm (S2) substrates. For Q5 substrate, a slight increase in intensity of the G peak was observed, mostly for thinner layers, which can be attributed to a weak SERS effect shielded by UnR. The combination of the following aspects: a blue shift of the G band position, a slight increase in the FWHM (Full Width at Half Maximum), and a slight increase of the Raman intensities of both G and 2D bands in other GS without UnR supports the argument of shielded SERS effect. On the other hand, the effects of UnR on the S1 and S2 substrates produce a decrease on the Raman intensities of G and 2D bands, opposite to the effect produced by the AuNPs; this result was found more intense for the S2 substrate in relation to S1. This is possibly caused by the greater amount of UnR accumulated on the Si/SiO2 substrate, due to its higher hydrophilicity in relation to other samples. Additional Raman measurements reveal that the Raman intensity of GS in all substrates is unaffected by the presence of a possible humidity on GS, revealing the effect of UnR. Hence, it is vital to understand how residues influence the salient features of GS/AuNPs.