414 research outputs found
A new classification system for degenerative spondylolisthesis of the lumbar spine
This is the author accepted manuscript. The final version is available from Springer Verlag via the DOI in this record.PURPOSE: There is no consensus for a comprehensive analysis of degenerative spondylolisthesis of the lumbar spine (DSLS). A new classification system for DSLS based on sagittal alignment was proposed. Its clinical relevance was explored. METHODS: Health-related quality-of-life scales (HRQOLs) and clinical parameters were collected: SF-12, ODI, and low back and leg pain visual analog scales (BP-VAS, LP-VAS). Radiographic analysis included Meyerding grading and sagittal parameters: segmental lordosis (SL), L1-S1 lumbar lordosis (LL), T1-T12 thoracic kyphosis (TK), pelvic incidence (PI), pelvic tilt (PT), and sagittal vertical axis (SVA). Patients were classified according to three main types-1A: preserved LL and SL; 1B: preserved LL and reduced SL (≤5°); 2A: PI-LL ≥10° without pelvic compensation (PT < 25°); 2B: PI-LL ≥10° with pelvic compensation (PT ≥ 25°); type 3: global sagittal malalignment (SVA ≥40 mm). RESULTS: 166 patients (119 F: 47 M) suffering from DSLS were included. Mean age was 67.1 ± 11 years. DSLS demographics were, respectively: type 1A: 73 patients, type 1B: 3, type 2A: 8, type 2B: 22, and type 3: 60. Meyerding grading was: grade 1 (n = 124); grade 2 (n = 24). Affected levels were: L4-L5 (n = 121), L3-L4 (n = 34), L2-L3 (n = 6), and L5-S1 (n = 5). Mean sagittal parameter values were: PI: 59.3° ± 11.9°; PT: 24.3° ± 7.6°; SVA: 29.1 ± 42.2 mm; SL: 18.2° ± 8.1°. DSLS types were correlated with age, ODI and SF-12 PCS (ρ = 0.34, p < 0.05; ρ = 0.33, p < 0.05; ρ = -0.20, and p = 0.01, respectively). CONCLUSION: This classification was consistent with age and HRQOLs and could be a preoperative assessment tool. Its therapeutic impact has yet to be validated. LEVEL OF EVIDENCE: 4.No funds were received in support of this work. No benefits in any forms have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript
Influência de diferentes substratos na germinação de sementes de jacarandá do Pará (Dalbergia spruceana Bth).
Pré-tratamento de resíduos agro-industriais e novas perspectivas na produção de bioprodutos
Visando contribuir para a melhoria das condições ambientais pela eliminação dos
resíduos agrícolas/agroindustriais, bem como proporcionar a formação de uma linha de
pesquisa com propósito de captar e disseminar informações técnicas e tecnológicas agregando
maior valor nestes subprodutos ou resíduos é que o presente trabalho foi realizado. Deste
modo, o sabugo de milho in natura foi submetido a dois diferentes processos de prétratamento
para a extração das hemiceluloses, como etapa inicial de aplicação integral do
resíduo, onde posteriormente estudos e aplicação do complexo celulose-lignina resultante
seriam realizados. Dentro deste contexto, o objetivo deste trabalho foi determinar a eficiência
de extração de frações de hemiceluloses de sabugo de milho por processos alcalinos (0,75 a
1,25 mol/L em 42,5ºC/180 min), e processos de autohidrólise (165 a 185ºC, razão líquida de
10:1p/p por 40 min). Este procedimento indicou o potencial de pré-tratamentos, em especial
dos licores hemicelulosicos obtidos, como parte de um processo que conduza à utilização de
materiais lignocelulósicos em diferentes processos biotecnológicos
Characterization of bacterial endophytes from the roots of native and cultivated Brazil nut trees (Bertholletia excelsa).
Título em português: Caracterização de bactérias endofíticas de raízes de castanha-do-Brasil (Bertholletia excelsa) em habitats nativos e cultivados
Characterization of the Brazilian continental shelf adjacent to Rio Grande do Norte state, NE Brazil
Using [Ne V]/[Ne III] to Understand the Nature of Extreme-Ionization Galaxies
Spectroscopic studies of extreme-ionization galaxies (EIGs) are critical to
our understanding of exotic systems throughout cosmic time. These EIGs exhibit
spectral features requiring >54.42 eV photons: the energy needed to fully
ionize helium into He2+ and emit He II recombination lines. They are likely key
contributors to reionization, and they can also probe exotic stellar
populations or accretion onto massive black holes. To facilitate the use of
EIGs as probes of high ionization, we focus on ratios constructed from strong
rest-frame UV/optical emission lines, specifically [O III] 5008, H-beta, [Ne
III] 3870, [O II] 3727,3729, and [Ne V] 3427. These lines probe the relative
intensity at energies of 35.12, 13.62, 40.96, 13.62 eV, and 97.12,
respectively, covering a wider range of ionization than traced by other common
rest-frame UV/optical techniques. We use ratios of these lines ([Ne V]/[Ne III]
= Ne53 and [Ne III]/[O II]), which are closely separated in wavelength, and
mitigates effects of dust attenuation and uncertainties in flux calibration. We
make predictions from photoionization models constructed from Cloudy that use a
broad range of stellar populations and black hole accretion models to explore
the sensitivity of these line ratios to changes in the ionizing spectrum. We
compare our models to observations from the Hubble Space Telescope and James
Webb Space Telescope of galaxies with strong high-ionization emission lines at
z ~ 0, z ~ 2, and z ~ 7. We show that the Ne53 ratio can separate galaxies with
ionization from 'normal' stellar populations from those with AGN and even
'exotic' Population III models. We introduce new selection methods to identify
galaxies with photoionization driven by Population III stars or
intermediate-mass black hole accretion disks that could be identified in
upcoming high-redshift spectroscopic surveys.Comment: 16 pages, 5 figures, 1 table. Accepted in Ap
Propriedades de chapas fabricadas com partículas de madeira de paricá (Schyzolobium amazonicum Huber ex. Ducke) e fibras de coco (Cocos nucifera L.)
Resistência das juntas coladas de madeiras de Inga alba (SW) Willd e Swartzia recurva Poepp
The objective of this study was to evaluate the quality of wood bonded joints of Inga alba and Swartzia recurva using polyvinyl acetate (PVAc) and polymeric emulsion of isocyanate (EPI) in weights of 150 and 200 g·m-2. The strength of the bonded joints was evaluated through shear tests, using the procedures described in EN 13354 (2008). The increase in weight did not influence the results of shear strength, indicating the benefits in economic terms with the reduction in the consumption of adhesive. Joints glued with the wood species of Swartzia recurve with EPI adhesive, at the two weights have reached the minimum value of 2.5 MPa concerning the lower 5th percentile established by EN 13353 (2008). The results demonstrated the feasibility of using wood of Swartzia recurva to produce edge glued panels - EGP, with EPI adhesive in weight of 150 g·m-2. © 2015, Federal University of Lavras
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