Universidade Estadual de Londrina

About: Universidade Estadual de Londrina is a education organization based out in Londrina, Brazil. It is known for research contribution in the topics: Population & Context (language use). The organization has 13052 authors who have published 19291 publications receiving 212123 citations.

5-Lipoxygenase Deficiency Reduces Acetaminophen-Induced Hepatotoxicity and Lethality

Abstract: This work was supported by grants from SETI/Fundacao Araucaria, Parana State Government, Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), and Coordenadoria de Aperfeicoamento de Pessoal de Nivel Superior (CAPES), Brazil.

Adolescents: knowledge about sexuality before and after participating in prevetion workshops

Abstract: Na adolescencia, a vivencia da sexualidade torna-se mais evidente. Muitas vezes, manifesta-se atraves de praticas sexuais inseguras, podendo se tornar um problema devido a falta de informacao, tabus ou mesmo pelo medo de assumi-la. O objetivo da pesquisa foi analisar o conhecimento dos adolescentes sobre sexualidade, metodos contraceptivos, gravidez, DST e aids, antes e apos oficinas de prevencao. Participaram 117 adolescentes da 8a serie de uma escola estadual de Londrina, Parana. Foi utilizado um questionario (pre e pos-teste) para identificar a diferenca do conhecimento dos adolescentes. Para a analise dos dados, usaram-se os testes quiquadrado e exato de Fischer. A faixa etaria concentrou-se entre 14 e 16 anos. Os meninos iniciaram mais cedo suas atividades sexuais. Apenas 28,2% dos adolescentes no pre-teste sabiam do periodo fertil da menina; apos as oficinas de prevencao, o conhecimento superou 55,8%. A aids foi a DST mais citada no pre-teste; no pos-teste, houve referencia a outras doencas (41,1%). Os metodos contraceptivos mais conhecidos sao o preservativo e a pilula. Nao houve relevância estatistica entre as respostas sobre atitudes de risco para transmissao de DST/aids. Conclui-se que ha necessidade de trabalho sistematico, a medio e longo prazo, sobre sexualidade na escola para os adolescentes.

Bacterial Community Associated with Fish and Water from Congonhas River, Sertaneja, Paraná, Brazil

Abstract: A bacteriological study was conducted on fish and water from Congonhas River, Sertaneja (22o58’ S; 50o58’ W), Parana State, Brazil. From 44% of the analysed fish, bacteria belonging to Pseudomonas, Acinetobacter, Aeromonas, Enterobacteriaceae, Micrococcus, Bacillus and Lactobacillus were isolated. The group most frequently isolated from fish was Aeromonas. In the water, the bacterial groups detected were Pseudomonas, Acinetobacter, Aeromonas, Enterobacteriaceae, Bacillus and Flavobacterium, from which Flavobacterium and Acinetobacter were the most abundant. The numbers of Colony Forming Units per millilitre of water varied from 3.1x102 to 1.0 x 103. Although a clear pattern was not detected in the susceptibilities/resistances of the isolated strains to nine antimicrobial substances, Gram negative aerobic bacteria were more resistant than the other strains. A simultaneous resistance to furazolidone, oxolinic acid and norfloxacin, particularly in the bacteria isolated from fish, as well as in the aerobic strains isolated from water was observed. The antimicrobial substances to which less resistances were found were oxytetracycline in the strains isolated from water, and trimethoprim-sulphamethoxazole, oxytetracycline and chloramphenicol in those isolated from fish.

Atenção odontológica à gestante: papel dos profissionais de saúde

Abstract: The scope of this article involved qualitative research conducted together with pregnant women attended by the Brazilian Unified Health System (SUS) and private services, seeking to identify the perception of these women on the role of health professionals in relation to dental care during pregnancy. The data were collected through recorded, semi-structured interviews based on a questionnaire and analyzed by assessment of thematic content. It was noted that some health professionals propagate and reinforce misconceptions and fears about dental care and oral health during pregnancy. The need for investment in education on dental care during pregnancy, both at undergraduate and graduate level, was clearly revealed, since knowledge on the subject can contribute to a review of concepts, and consequently the manifest behavior vis-a-vis this segment of the population.

Antenna Selection for Improving Energy Efficiency in XL-MIMO Systems

Abstract: We consider the recently proposed extra-large scale massive multiple-input multiple-output (XL-MIMO) systems, with some hundreds of antennas serving a smaller number of users. Since the array length is of the same order as the distance to the users, the long-term fading coefficients of a given user vary with the different antennas at the base station (BS). Thus, the signal transmitted by some antennas might reach the user with much more power than that transmitted by some others. From a green perspective, it is not effective to simultaneously activate hundreds or even thousands of antennas, since the power-hungry radio frequency (RF) chains of the active antennas increase significantly the total energy consumption. Besides, a larger number of selected antennas increases the power required by linear processing, such as precoding matrix computation, and short-term channel estimation. In this paper, we propose four antenna selection (AS) approaches to be deployed in XL-MIMO systems aiming at maximizing the total energy efficiency (EE). Besides, employing some simplifying assumptions, we derive a closed-form analytical expression for the EE of the XL-MIMO system, and propose a straightforward iterative method to determine the optimal number of selected antennas able to maximize it. The proposed AS schemes are based solely on long-term fading parameters, thus, the selected antennas set remains valid for a relatively large time/frequency intervals. Comparing the results, we find that the genetic-algorithm based AS scheme usually achieves the best EE performance, although our proposed highest normalized received power AS scheme also achieves very promising EE performance in a simple and straightforward way.