oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 417 )

2018 ( 674 )

2017 ( 674 )

2016 ( 935 )

Custom range...

Search Results: 1 - 10 of 402455 matches for " W.S. Costa "
All listed articles are free for downloading (OA Articles)
Page 1 /402455
Display every page Item
MORFOLOGíA Y FRACCIóN DEL áREA DEL LUMEN GLANDULAR DE LA ZONA DE TRANSICIóN EN LA PRóSTATA HUMANA
Babinski,M. A.; Chagas,M. A.; Costa,W.S.; Pereira,M. J.;
Revista chilena de anatomía , 2002, DOI: 10.4067/S0716-98682002000300004
Abstract: although the male reproductive system diseases are not restricted to the prostate, this is one of the most interesting organs for the urologic medical practice. the benign prostatic hyperplasia (bph) represents a tissual increase of these histological elements causing profound alterations in the prostate organisation. therefore this study aims at evaluating the glandular lumen volumetric density (vv) the transition zone (median lobe) in human normal prostates compared with hyperplastic ones (bph). controls consisted of 10 samples of prostates transition region obtained during necropsy of young adults victims of accidents. samples of prostatic tissue of the transition zone were obtained from 10 patients with clinical symptoms of bladder outlet obstruction and histopathological diagnoses of the bph submitted to transvesicalprostatectomy. samples of the 5mm were stained on paraffin sections of prostate using hematoxilin-eosin. for the quantitative analysis the stereology method assisted by a software program was used to verify the vv. the glandular lumen volumetric density showed the significant statistically bph increase, which seems to be related to the bladder outlet obstruction and to the stasis of the luminal contents, causing intraluminal pressure in turn deformations in the glandular with probable consequences in the epithelium, well the to the secretory alterations.
MORFOLOGíA Y FRACCIóN DEL áREA DEL LUMEN GLANDULAR DE LA ZONA DE TRANSICIóN EN LA PRóSTATA HUMANA MORPHOLOGY AND AREAL FRACTION OF THE GLANDULAR LUMEN OF TRANSITION ZONE IN THE HUMAN PROSTATE
M. A. Babinski,M. A. Chagas,W.S. Costa,M. J. Pereira
Revista chilena de anatomía , 2002,
Abstract: Aunque las enfermedades del sistema reproductor masculino no se restringen a la próstata, éste es uno de los órganos más interesantes para la práctica médica urológica. La hiperplasia prostática benigna (HPB) representa un aumento tisular de estos elementos histológicos que causan alteraciones profundas en el organización de la próstata. Este estudio pretende evaluar la densidad volumétrica (VV) del lumen glandular de la zona de transición (lóbulo mediano) en próstatas humanas normales, comparadas con hiperplásicas (HPB). Muestras de tejidos prostáticos de la zona de transición fueron obtenidas de 10 pacientes con síntomas de obstrucción infravesical y diagnóstico histopatológico del HPB, sometidos a prostatectomía transvesical. Para control fueron utilizadas 10 muestras de la región de transición prostática, obtenidas durante la necroscopía de jóvenes adultos, víctimas de accidentes. Los bloques de parafina de muestras prostáticas fueron seccionados con 5μm de grosor y te idos con Hematoxilina y Eosina. Para el análisis cuantitativo, fue usado el método estereológico asistido por un programa de software para verificar la VV. La densidad volumétrica del lumen glandular, mostró un incremento estadísticamente significativo de la HPB, y esto parece estar relacionado con la obstrucción infravesical y el éstasis del contenido luminal, aumentando la presión intraluminal y, por tanto, causa deformaciones de las glándulas con probables consecuencias en el epitelio, así como alteraciones secretorias. Although the male reproductive system diseases are not restricted to the prostate, this is one of the most interesting organs for the urologic medical practice. The benign prostatic hyperplasia (BPH) represents a tissual increase of these histological elements causing profound alterations in the prostate organisation. Therefore this study aims at evaluating the glandular lumen volumetric density (VV) the transition zone (median lobe) in human normal prostates compared with hyperplastic ones (BPH). Controls consisted of 10 samples of prostates transition region obtained during necropsy of young adults victims of accidents. Samples of prostatic tissue of the transition zone were obtained from 10 patients with clinical symptoms of bladder outlet obstruction and histopathological diagnoses of the BPH submitted to transvesicalprostatectomy. Samples of the 5mm were stained on paraffin sections of prostate using hematoxilin-eosin. For the quantitative analysis the stereology method assisted by a software program was used to verify the VV. The glandular lumen volumetric den
Chrysoperla externa (Neuroptera: Chrysopidae) and Utetheisa ornatrix (Lepidoptera: Arctiidae) on organically grown Crotalaria juncea (Fabaceae) Chrysoperla externa (Neuroptera: Chrysopidae) e Utetheisa ornatrix (Lepidoptera: Arctiidae) sobre Crotalaria juncea (Fabaceae) cultivada organicamente
M.A. Costa,W.S. Tavares,A.I.A. Pereira,I. Cruz
Planta Daninha , 2012, DOI: 10.1590/s0100-83582012000300001
Abstract: Chrysoperla externa (Neuroptera: Chrysopidae) larvae can avoid foraging on plants of Crotalaria juncea (Fabaceae) after the issuance of floral buds, when the prey of Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporate toxic pyrrolizidine alkaloids from this plant. This reduces the predation and favors increasing the number of adults and eggs of this defoliator on crops of this plant. The aim of the present paper was to evaluate some biological and ecological aspects of C. externa and U. ornatrix on the organic crop of C. juncea in the EMBRAPA Maize and Sorghum in Sete Lagoas, Minas Gerais State, Brazil. Chrysoperla externa and U. ornatrix were more abundant in the vegetative and flowering stages of C. juncea, respectively, with caterpillars of this defoliator feeding on leaves and seeds of this plant. The duration of the stages/instars, survival, lifetime fecundity, and oviposition showed that the branches of C. juncea are a suitable food for U. ornatrix. The abundance of adults and larvae of C. externa was lower in the flowering and pods stages of C. juncea, respectively, when the postures of U. ornatrix are present, probably due to the toxicity of the eggs of this prey to this predator. During these stages, C. externa may be reared with alternative hosts, and when the crops of C. juncea are scarce, an artificial diet should be used for rearing this defoliator in the laboratory for biological research and the development of biological control tactics. Larvas de Chrysoperla externa (Neuroptera: Chrysopidae) podem evitar o forrageamento sobre plantas de Crotalaria juncea (Fabaceae) após a emiss o de bot es florais, quando presas de Utetheisa ornatrix (Lepidoptera: Arctiidae) incorporam alcalóides pirrolizidínicos tóxicos dessa planta. Isso reduz a preda o e favorece o aumento do número de adultos e ovos desse desfolhador sobre cultivos dessa planta. O objetivo deste trabalho foi avaliar alguns aspectos biológicos e ecológicos de C. externa e U. ornatrix sobre cultivo organico de C. juncea na EMBRAPA Milho e Sorgo, em Sete Lagoas, Minas Gerais, Brasil. Chrysoperla externa e U. ornatrix foram mais abundantes nos estádios vegetativo e de florescimento de C. juncea, respectivamente, com lagartas desse desfolhador se alimentando sobre folhas e sementes dessa planta. A dura o dos estágios/estádios, sobrevivência, fecundidade de vida e oviposi o mostraram que ramos de C. juncea é um alimento adequado para U. ornatrix. A abundancia de adultos e larvas de C. externa foi menor nas fases de flora o e vagens de C. juncea, respectivamente, quando posturas de
The reliability analysis of cutting tools in the HSM processes
W.S. Lin
Archives of Materials Science and Engineering , 2008,
Abstract: Purpose: This article mainly describe the reliability of the cutting tools in the high speed turning by normaldistribution model.Design/methodology/approach: A series of experimental tests have been done to evaluate the reliabilityvariation of the cutting tools. From experimental results, the tool wear distribution and the tool life are determined,and the tool life distribution and the reliability function of cutting tools are derived. Further, the reliability ofcutting tools at anytime for high speed machining (HSM) is easily calculated from cutting parameters and toolwear limit from the derived reliability function.Findings: The higher the cutting speed, the sooner the tool flank wear, and the faster the degrade speed of thereliability curve. It means that the sooner the tool flank wear rate, the shorter the tool life, and it is the time tochange the cutting tool.Practical implications: This paper shows that the tool flank wear rate can be described by the reliabilitydegrade rate, the higher the flank wear rate, the steeper the tool reliability degrade rate.Originality/value: This article is discussing about the tool wear variation of the cutting tool from the point ofreliability. From the reliability variation of the cutting tool, we can further predict the tool life, in order to decidethe tool replacement time.
The study of high speed fine turning of austenitic stainless steel
W.S. Lin
Journal of Achievements in Materials and Manufacturing Engineering , 2008,
Abstract: Purpose: The purpose of this research paper is focused on the surface roughness variation in high speed fine turning of the austenitic stainless steel.Design/methodology/approach: A series of experimental tests have been done to evaluate the possibility of high speed fine turning of the austenitic stainless steel from the surface roughness variation and machining stability.Findings: It was found that, the smaller the feed rate, the smaller the surface roughness value. But when the feed rate smaller than the critical feed rate, the chatter will occurs and the surface roughness of the work piece would be deteriorated.The higher the cutting speed is, the higher the cutting temperature of cutting tool is. The cutting tool will be soften and the surface roughness of the workpiece will be deteriorated.Research limitations/implications: The tool chattering would caused poor surface roughness in high speed fine turning for feed rate smaller than 0.02 mm/rev. The chatter suppression method must be considered when high speed fine turning of austenitic stainless steel.Originality/value: Most of the stainless steel machining proceeds at low cutting speed because the austenitic stainless steel is a hard machining material. The research result of this paper indicated that high speed fine turning of austenitic stainless steel is possible.
Forrageamento de apis mellifera l. em oiticica (licania rigida)
Silva,R.A.; Fernandes,D.; Lucena Bezerra,L.; Costa Silva,W.S.; Barreto de Lima,A.;
Archivos de Zootecnia , 2010, DOI: 10.4321/S0004-05922010000300012
Abstract: this research was carried at campus iv do centro de ciências humanas e agrárias da universidade estadual da paraíba, catolé do rocha, paraiba, brazil, to study the foraging behavior of apis mellifera l. on licania rigida flowers along day. the number of visits that bees made to flowers from 07:00 to 17:00 hours, were recorded every 10 minutes, during six days. the results showed that honey bees foraged for nectar more frequently under shaded and wind protected parts.
MgO-Au cermet films
W.S.R.
Gold Bulletin , 1978, DOI: 10.1007/BF03216527
Abstract:
The development of gold drugs
W.S.R.
Gold Bulletin , 1981, DOI: 10.1007/BF03216736
Abstract:
Precipitation hardening and ordering of carat gold jewellery alloys
W.S.R.
Gold Bulletin , 1978, DOI: 10.1007/BF03216531
Abstract: The mechanical properties of gold jewellery alloys are dependant upon their thermal as well as their mechanical histories. An understanding of the mechanisms by which they harden during thermal treatment is therefore important. Two contributions to knowledge in this area are discussed in this note.
Management of low-risk patients with thyroid carcinoma and detectable thyroglobulin on T4 after thyroidectomy and ablation with iodine-131
Rosário, Pedro W.S.;Borges, Michelle A.R.;Costa, Graciela B.C.;Rezende, Leonardo L.;Padr?o, Eduardo L.;Barroso, álvaro L.;Purisch, Saulo;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2007, DOI: 10.1590/S0004-27302007000100016
Abstract: objective: to evaluate the positive predictive value of detectable tg during t4 therapy (tg on t4) in patients with thyroid cancer after total thyroidectomy and remnant ablation, discussing the work-up in this situation and the empirical indication of 131i. patients and methods: initially, 234 low-risk patients [tumor < 5cm, completely resected, no extensive extrathyroid invasion (pt4)] submitted to total thyroidectomy and ablation with 131i (3.7-5.5 gbq) who presented no ectopic uptake on rxwbs were studied. of these, 23 patients with detectable tg on t4 (> 1ng/ml) during the first year after initial therapy were selected. results: metastases were detected by neck us in 7 patients, by chest ct in 2 and by us and ct in 3. four of five patients with lung metastases upon ct had a positive rxwbs. eleven patients with negative us and ct received a new 131i dose (without dxwbs), and rxwbs showed ectopic uptake in 3 patients. among the patients with negative rxwbs, 7 remained free of apparent disease and tg was declining (5 with undetectable tg on t4 at the end of the study). one patient presented an increase in tg and fdg-pet was positive for lymph node and bone metastases. conclusions: all patients with tg on t4 > 5ng/ml presented apparent disease. in these cases, even when us and ct are negative, the administration of a therapeutic dose of 131i (without dxwbs) and fdg-pet are recommended. among patients with detectable tg on t4 < 5ng/ml and negative us and ct, only 12% presented ectopic uptake on rxwbs. these cases could be followed up by monitoring tg on t4, and rxwbs and fdg-pet should only be performed if this marker does not decrease after 1-2 years.
Page 1 /402455
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.