3,395 research outputs found
Psychological, Social Environmental, and Physical Environmental Variables in Explaining Physical Activity in Korean Older Adults
The current study investigated the direct and indirect paths of psychological, social environmental, and physical environmental variables in explaining physical activity among Korean older adults. A total of 401 adults aged 65 years old or older (Mage = 75.17 years, SD = ±7.24) were recruited from the Nowon district of northern Seoul. Standardized scales were used to measure physical activity and its related social ecological variables. The results indicated that physical activity was significantly correlated with self efficacy, perceived benefits, perceived barriers, family support, friend support, availability of facilities, and quality of facilities. All of psychological, social environmental, and physical environmental variables had a significant direct path to explain physical activity. In addition, self-efficacy and perceived benefits significantly mediated the relationship between family support and physical activity, and while the relationship between availability of facilities and physical activity was substantially mediated by perceived barriers. The current study implies that application of the social ecological model is warranted to provide a more concrete association of the contextual factors to explain physical activity and to design a more effective intervention for promoting physical activity among older adults.El presente estudio investigó los efectos directos e indirectos de las variables psicológicas, socioambientales y físicoambientales para explicar la actividad física entre los adultos mayores de Corea. Un total de 401 adultos de 65 años de edad o más (Medad = 75,17 años, DT = ± 7,24) fueron reclutados del distrito de Nowon, en el norte de Seúl. Se utilizaron escalas estandarizadas para medir la actividad física y sus variables sociales y ecológicas. Los resultados indicaron que la actividad física estaba significativamente correlacionada con la autoeficacia, los beneficios percibidos, las barreras percibidas, el apoyo familiar, el apoyo a los amigos, la disponibilidad de instalaciones y la calidad de las instalaciones. Todas las variables ambientales psicológicas, sociales, ambientales y físicas tenían un efecto directo significativo para explicar la actividad física. Además, la autoeficacia y los beneficios percibidos mediaron de forma significativa la relación entre el apoyo familiar y la actividad física, y mientras que la relación entre la disponibilidad de instalaciones y la actividad física estaba sustancialmente mediada por las barreras percibidas. El presente estudio implica que la aplicación del modelo socio-ecológico se justifica para proporcionar una asociación más concreta de los factores contextuales para explicar la actividad física y diseñar una intervención más eficaz para promover la actividad física entre los adultos mayores.O presente estudo investigou os caminhos diretos e indiretos das variáveis ambientais psicológicas, sociais, ambientais e físicas na explicação da atividade física entre idosos coreanos. Um total de 401 adultos com 65 anos de idade ou mais (Mage = 75,17 anos, DP = ± 7,24) foram recrutados no distrito de Nowon, no norte de Seul. Escalas padronizadas foram utilizadas para medir a atividade física e suas variáveis sociais e ecológicas. Os resultados indicaram que a atividade física estava significativamente correlacionada com auto-eficácia, benefícios percebidos, barreiras percebidas, apoio familiar, apoio amigo, disponibilidade de instalações e qualidade das instalações. Todas as variáveis ambientais psicológicas, sociais, ambientais e físicas tiveram um caminho direto significativo para explicar a atividade física. Além disso, a auto-eficácia e os benefícios percebidos mediaram significativamente a relação entre apoio familiar e atividade física, e enquanto a relação entre a disponibilidade de instalações ea atividade física era substancialmente mediada por barreiras percebidas. O presente estudo implica que a aplicação do modelo sócio-ecológico é justificada para proporcionar uma associação mais concreta dos fatores contextuais para explicar a atividade física e para projetar uma intervenção mais efetiva para promover a atividade física entre os adultos mais velhos
Attitude after a mild aortic valve lesion during rheumatic mitral valve surgery
ObjectiveWe evaluated whether rheumatic aortic valve disease of mild degree should be treated in patients undergoing mitral valve surgery.MethodsFrom 1992 to 2010, 197 patients (aged 52 [19-82] years, male:female = 60:137) who had rheumatic mitral valve disease and mild aortic valve disease were enrolled. The aortic valve was untreated in 114 patients (no treatment group), repaired in 40 patients (aortic valvuloplasty group), and replaced in 43 patients (aortic valve replacement group).ResultsOperative mortality occurred in 4 patients (2.0%). There were no differences in early mortality and postoperative complications among the 3 groups. Overall survival at 5, 10, and 15 years was 96.3%, 92.1%, and 85.7%, respectively. In the no treatment group, progression-free survival in significant aortic valve disease at 5, 10, and 15 years was 98.7%, 91.3%, and 81.1%, respectively. This was not superior in the aortic valvuloplasty group (85.9%, 77.6%, and 69.8%, respectively) than in the no treatment group. Freedom from aortic valve disease was lower in patients with aortic stenosis than in those with aortic regurgitation in univariate and multivariable analyses (P < .001). Reoperation was performed in 19 patients, including 2 aortic valve reoperations. Aortic valve–related event-free survival was similar among the 3 groups.ConclusionsMild aortic valve disease in patients undergoing rheumatic mitral valve surgery could be left untreated, because preventive aortic valve operation does not result in better clinical and echocardiographic outcomes
The Globular Cluster System of M60 (NGC 4649). I. CFHT MOS Spectroscopy and Database
We present the measurement of radial velocities for globular clusters in M60,
giant elliptical galaxy in the Virgo cluster. Target globular cluster
candidates were selected using the Washington photometry based on the deep
16\arcmin \times 16\arcmin images taken at the KPNO 4m and using the
photometry derived from the HST/WFPC2 archive images. The spectra of the target
objects were obtained using the Multi-Object Spectrograph (MOS) at the
Canada-France-Hawaii Telescope (CFHT). We have measured the radial velocity for
111 objects in the field of M60: 93 globular clusters (72 blue globular
clusters with and 21 red globular clusters with
), 11 foreground stars, 6 small galaxies, and the nucleus of
M60. The measured velocities of the 93 globular clusters range from
km s to km s, with a mean value of
km s, which is in good agreement with the velocity of the nucleus of M60
( km s). Combining our results with data in the
literature, we present a master catalog of radial velocities for 121 globular
clusters in M60. The velocity dispersion of the globular clusters in the master
catalog is found to be km s for the entire sample,
km s for 83 blue globular clusters, and
km s for 38 red globular clusters.Comment: 29 pages, 8 figures. To appear in Ap
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Comparison of the Plasma Metabolome Profiles Between the Internal Thoracic Artery and Ascending Aorta in Patients Undergoing Coronary Artery Bypass Graft Surgery Using Gas Chromatography Time-of-Flight Mass Spectrometry.
BackgroundThe left internal thoracic artery (LITA) has been used as the first conduit of choice in coronary artery bypass grafting (CABG) because of excellent long-term patency and outcomes. However, no studies have examined substances other than nitric oxide that could be beneficial for the bypass conduit, native coronary artery or ischemic myocardium. This study was conducted to evaluate differences in metabolic profiles between the LITA and ascending aorta using gas chromatography-time of flight-mass spectrometry (GC-TOF-MS).MethodsTwenty patients who underwent CABG using the LITA were prospectively enrolled. Plasma samples were collected simultaneously from the LITA and ascending aorta. GC-TOF-MS based untargeted metabolomic analyses were performed and a 2-step volcano plot analysis was used to identify distinguishable markers from two plasma metabolome profiles. Semi-quantitative and quantitative analyses were performed using GC-TOF-MS and enzyme-linked immunosorbent assay, respectively, after selecting target metabolites based on the metabolite set enrichment analysis.ResultsInitial volcano plot analysis demonstrated 5 possible markers among 851 peaks detected. The final analysis demonstrated that the L-cysteine peak was significantly higher in the LITA than in the ascending aorta (fold change = 1.86). The concentrations of intermediate metabolites such as L-cysteine, L-methionine and L-cystine in the 'cysteine and methionine metabolism pathway' were significantly higher in the LITA than in the ascending aorta (2.0-, 1.4- and 1.2-fold, respectively). Quantitative analysis showed that the concentration of hydrogen sulfide (H₂S) was significantly higher in the LITA.ConclusionThe plasma metabolome profiles of the LITA and ascending aorta were different, particularly higher plasma concentrations of L-cysteine and H₂S in the LITA
A Human Embryo of Carnegie Stage 12
A human embryo obtained from a salpinx removed for the treatment of
tubal gestation was serially sectioned and observed. On gross examination, the embryo
showed three prominent pharyngeal arches, but not the cervical sinus. The upper arm
bud had just begun to appear with a slight elevation in the skin ectoderm. Both the anterior
and posterior neuropores had already been closed. The heart was at the cardiac
loop stage. The respiratory diverticulum, the dorsal pancreas and the beginning of the
omental bursa had appeared. In the pharyngeal region, the adenohypophyseal pocket
and the thyroid anlage were observed. The optic evagination showed no regional differentiation
yet. From the above findings, we concluded that this embryo belonged to
Carnegie stage 12
The Connection between Star-Forming Galaxies, AGN Host Galaxies and Early-Type Galaxies in the SDSS
We present a study of the connection between star-forming galaxies, AGN host
galaxies, and normal early-type galaxies in the Sloan Digital Sky Survey
(SDSS). Using the SDSS DR5 and DR4plus data, we select our early-type galaxy
sample in the color versus color-gradient space, and we classify the spectral
types of the selected early-type galaxies into normal, star-forming, Seyfert,
and LINER classes, using several spectral line flux ratios. We investigate the
slope in the fundamental space for each class of early-type galaxies and find
that there are obvious differences in the slopes of the fundamental planes
(FPs) among the different classes of early-type galaxies, in the sense that the
slopes for Seyferts and star-forming galaxies are flatter than those for normal
galaxies and LINERs. This may be the first identification of the systematic
variation of the FP slope among the subclasses of early-type galaxies. The
difference in the FP slope might be caused by the difference in the degree of
nonhomology among different classes or by the difference of gas contents in
their merging progenitors. One possible scenario is that the AGN host galaxies
and star-forming galaxies are formed by gas-rich merging and that they may
evolve into normal early-type galaxies after finishing their star formation or
AGN activities.Comment: 5 pages with emulateapj, 2 figures, accepted for publication in the
Astrophysical Journal Letter
Dissection of C. elegans behavioral genetics in 3-D environments
The nematode Caenorhabditis elegans is a widely used model for genetic dissection of animal behaviors. Despite extensive technical advances in imaging methods, it remains challenging to visualize and quantify C. elegans behaviors in three-dimensional (3-D) natural environments. Here we developed an innovative 3-D imaging method that enables quantification of C. elegans behavior in 3-D environments. Furthermore, for the first time, we characterized 3-D-specific behavioral phenotypes of mutant worms that have defects in head movement or mechanosensation. This approach allowed us to reveal previously unknown functions of genes in behavioral regulation. We expect that our 3-D imaging method will facilitate new investigations into genetic basis of animal behaviors in natural 3-D environments
Coexistence of WiFi and WiMAX Systems Based on PS-Request Protocols†
We introduce both the coexistence zone within the WiMAX frame structure and a PS-Request protocol for the coexistence of WiFi and WiMAX systems sharing a frequency band. Because we know that the PS-Request protocol has drawbacks, we propose a revised PS-Request protocol to improve the performance. Two PS-Request protocols are based on the time division operation (TDO) of WiFi system and WiMAX system to avoid the mutual interference, and use the vestigial power management (PwrMgt) bit within the Frame Control field of the frames transmitted by a WiFi AP. The performance of the revised PS-Request protocol is evaluated by computer simulation, and compared to those of the cases without a coexistence protocol and to the original PS-Request protocol
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