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Search Results: 1 - 10 of 274761 matches for " Marcia B. H.; "
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Vapor chamber heat sink with hollow fins
Michels, Vanessa;Milanez, Fernando H.;Mantelli, Marcia B. H.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2012, DOI: 10.1590/S1678-58782012000300002
Abstract: a new vapor chamber heat sink with maximum fin efficiency is presented. the fins are hollow, so the vapor generated at the base flows up to the top of the fins. as a result, the heat sink is practically isothermal. a prototype of the hollow fin vapor chamber heat sink was built and tested. the prototype presented 20% less overall thermal resistance than conventional pin fin heat sinks with the same mass and volume. a theoretical model for the heat sink thermal resistance was developed and the agreement between the model and the experimental data is fair.
Factores de riesgo de enfermedades crónicas no transmisibles en funcionarios de una empresa de servicios financieros de la Región Metropolitana
Fagalde H,María del Pilar; Solar H,José Antonio del; Guerrero B,Marcia; Atalah S,Eduardo;
Revista médica de Chile , 2005, DOI: 10.4067/S0034-98872005000800008
Abstract: background: the epidemic of cardiovascular diseases in chile, requires the development of strategies in health promotion and prevention. aim: to assess the prevalence of risk factors for chronic non communicable diseases among workers of a financial company in metropolitan santiago. material and methods: assessment of 2,225 workers (1,383 males with a median age of 49 years and 842 females with a median age of 43 years). all answered an enquiry about education, medical history, smoking habits and physical activity. body mass index and blood pressure were measured and a blood sample was obtained to measure blood glucose and lipid levels. logistic repression models were used to determine the main risk factors for hypertension, diabetes, obesity, hypercholesterolemia and hyperuricemia. results: sixteen percent of studied subjects were obese, 49% had overweight, 57% had hypercholesterolemia, 28% had high blood pressure, 4% were diabetic, 4% had hyperuricemia, 45% smoked and 83% were sedentary. each worker had a mean of 2.4±1.1 risk factors. this figure was significantly higher among men, obese subjects, those older than 40 years and those with a lower educational level. conclusions: there is an important disease burden among the studied subjects, specially among obese and older individuals. healthy lifestyles should be promoted in this population
Factores de riesgo de enfermedades crónicas no transmisibles en funcionarios de una empresa de servicios financieros de la Región Metropolitana Risk factors for non communicable chronic diseases among workers of a financial company
María del Pilar Fagalde H,José Antonio del Solar H,Marcia Guerrero B,Eduardo Atalah S
Revista médica de Chile , 2005,
Abstract: Background: The epidemic of cardiovascular diseases in Chile, requires the development of strategies in health promotion and prevention. Aim: To assess the prevalence of risk factors for chronic non communicable diseases among workers of a financial company in Metropolitan Santiago. Material and Methods: Assessment of 2,225 workers (1,383 males with a median age of 49 years and 842 females with a median age of 43 years). All answered an enquiry about education, medical history, smoking habits and physical activity. Body mass index and blood pressure were measured and a blood sample was obtained to measure blood glucose and lipid levels. Logistic repression models were used to determine the main risk factors for hypertension, diabetes, obesity, hypercholesterolemia and hyperuricemia. Results: Sixteen percent of studied subjects were obese, 49% had overweight, 57% had hypercholesterolemia, 28% had high blood pressure, 4% were diabetic, 4% had hyperuricemia, 45% smoked and 83% were sedentary. Each worker had a mean of 2.4±1.1 risk factors. This figure was significantly higher among men, obese subjects, those older than 40 years and those with a lower educational level. Conclusions: There is an important disease burden among the studied subjects, specially among obese and older individuals. Healthy lifestyles should be promoted in this population
FISIOPATOLOGíA DE LA ROTURA PREMATURA DE LAS MEMBRANAS OVULARES EN EMBARAZOS DE PRETéRMINO
Rivera Z,René; Caba B,Fresia; Smirnow S,Marcia; Aguilera T,Jorge; Larraín H,Angélica;
Revista chilena de obstetricia y ginecología , 2004, DOI: 10.4067/S0717-75262004000300013
Abstract: the information in literature about the structure of the membranes is reviwed, describing the zone of the extremely alterated morphology, the pathophysiologic mechanism involved in the premature rupture of the membranes (emphasizing the process of apoptosis), related to infections, placentary ischemia, membranes strain, choridecidual hemorrhage, tobacco, relaxin, prolactin, parathyroid hormone
Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf
Mahiques Michel M. de,Bícego Marcia C.,Silveira Ilson C.A.,Sousa Silvia H.M.
Anais da Academia Brasileira de Ciências , 2005,
Abstract: The analyses of Uk'37 paleotemperatures and sedimentological parameters in box cores from the Cabo Frio upwelling zone, southeastern Brazil, were used to understand the modern sedimentation as well as to evaluate the role played by the upwelling process in the sedimentary patterns. Three box-cores located closer to the upwelling area show a general trend of cooling waters taking place in the last 700 years. Since the present upwelling is dependent on local and remote wind regime, a phase of dominating NE winds favors a more effective upward transport of the cold thermocline level South Atlantic CentralWater towards the coast. The intensification in the upwelling regime for the last ca. 700 years can be associated with the strengthening of the NE winds off the area and a possible increase of the Brazil Current mesoscale activity. Nevertheless, the lack of significant correlation of the paleotemperatures and most of sedimentological parameters indicate that upwelling is not the only sedimentation mechanism in the area. Also, the comparison of sedimentological parameters reveals that eventual temporal changes are superimposed by the geographical variability. Sedimentation rates vary from 0.26 mm.yr-1 to 0.66 mm.yr-1.
ABCC1 Is Related to the Protection of the Distal Nephron against Hyperosmolality and High Sodium Environment: Possible Implications for Cancer Chemotherapy
Leonardo M. Fonseca, Adriana B. Alvarez, Rachel C. Rodrigues, Diego H. F. Santos, Anibal G. Lopes, Marcia A. M. Capella
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068049
Abstract: Aims Glutathione (GSH) plays an important role in protecting cells against oxidative damage. ABCC1 protein transports GSH. Although this protein is largely studied in cancer, due to multidrug resistance phenotype, its role in the tubular cells of the kidney is unknown. The goal of this study was to find out whether ABCC1 has a role in protecting cells from the distal nephron against the stress caused by high medullar osmolality. Main Methods MA104 cells were treated with high concentrations of sodium chloride, urea, or both to raise the osmolality of the culture medium. Cell viability was accessed by MTT and trypan blue assays. ABCC1 expression and extrusion of carboxi-fluorescein (CF), a fluorescent ABCC1 substrate, were measured by flow cytometry. Key Findings Incubation of MA104 cells in a high sodium concentration medium resulted in changes in cell granularity and altered expression and activity of ABCC1. Urea did not alter ABCC1 expression or activity, but reversed the observed NaCl effects. High sodium concentrations also had a negative effect on cell viability and urea also protected cells against this effect. Significance Our findings demonstrate that ABCC1 plays a significant role in the protection of kidney epithelial cells against the stress caused by high sodium environment present in renal medulla.
Segmental Duplication Implicated in the Genesis of Inversion 2Rj of Anopheles gambiae
Mamadou B. Coulibaly, Neil F. Lobo, Meagan C. Fitzpatrick, Marcia Kern, Olga Grushko, Daniel V. Thaner, Sékou F. Traoré, Frank H. Collins, Nora J. Besansky
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000849
Abstract: The malaria vector Anopheles gambiae maintains high levels of inversion polymorphism that facilitate its exploitation of diverse ecological settings across tropical Africa. Molecular characterization of inversion breakpoints is a first step toward understanding the processes that generate and maintain inversions. Here we focused on inversion 2Rj because of its association with the assortatively mating Bamako chromosomal form of An. gambiae, whose distinctive breeding sites are rock pools beside the Niger River in Mali and Guinea. Sequence and computational analysis of 2Rj revealed the same 14.6 kb insertion between both breakpoints, which occurred near but not within predicted genes. Each insertion consists of 5.3 kb terminal inverted repeat arms separated by a 4 kb spacer. The insertions lack coding capacity, and are comprised of degraded remnants of repetitive sequences including class I and II transposable elements. Because of their large size and patchwork composition, and as no other instances of these insertions were identified in the An. gambiae genome, they do not appear to be transposable elements. The 14.6 kb modules inserted at both 2Rj breakpoint junctions represent low copy repeats (LCRs, also called segmental duplications) that are strongly implicated in the recent (~0.4Ne generations) origin of 2Rj. The LCRs contribute to further genome instability, as demonstrated by an imprecise excision event at the proximal breakpoint of 2Rj in field isolates.
Household vacuum cleaners vs. the high-volume surface sampler for collection of carpet dust samples in epidemiologic studies of children
Joanne S Colt, Robert B Gunier, Catherine Metayer, Marcia G Nishioka, Erin M Bell, Peggy Reynolds, Patricia A Buffler, Mary H Ward
Environmental Health , 2008, DOI: 10.1186/1476-069x-7-6
Abstract: Both methods were used in 45 homes in California. HVS3 samples were collected in one room, while the household vacuum had typically been used throughout the home. The samples were analyzed for 64 organic compounds, including pesticides, polycyclic aromatic hydrocarbons, and polychlorinated biphenyls (PCBs), using GC/MS in multiple ion monitoring mode; and for nine metals using conventional microwave-assisted acid digestion combined with ICP/MS.The methods agreed in detecting the presence of the compounds 77% to 100% of the time (median 95%). For compounds with less than 100% agreement, neither method was consistently more sensitive than the other. Median concentrations were similar for most analytes, and Spearman correlation coefficients were 0.60 or higher except for allethrin (0.15) and malathion (0.24), which were detected infrequently, and benzo(k)fluoranthene (0.55), benzo(a)pyrene (0.55), PCB 105 (0.54), PCB 118 (0.54), and PCB 138 (0.58). Assuming that the HVS3 method is the "gold standard," the extent to which the household vacuum cleaner method yields relative risk estimates closer to unity by increasing random measurement error varies by compound and depends on the method used to calculate relative risk.The household vacuum cleaner method appears to be a reasonable alternative to the HVS3 for detecting, ranking, and quantifying the concentrations of pesticides and other compounds in carpet dust.Pesticides may enter the home from indoor use, track-in or drift from outdoors, or take-home contamination from occupational use [1-3]. Pesticides may persist for long periods of time inside the home, where they are protected from degradation by sunlight, rain, temperature extremes, and most microbial action [4]. Carpets are repositories for pesticides [5-7]; the fibers and underlying foam pad appear to act as long-term reservoirs that continuously transfer pesticides to carpet dust [8,9]. Several large epidemiology and exposure studies have collected carpet dust sa
Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf
Mahiques, Michel M. de;Bícego, Marcia C.;Silveira, Ilson C.A.;Sousa, Silvia H.M.;Louren？o, Rafael A.;Fukumoto, Marina M.;
Anais da Academia Brasileira de Ciências , 2005, DOI: 10.1590/S0001-37652005000300013
Abstract: the analyses of uk'37 paleotemperatures and sedimentological parameters in box cores from the cabo frio upwelling zone, southeastern brazil, were used to understand the modern sedimentation as well as to evaluate the role played by the upwelling process in the sedimentary patterns. three box-cores located closer to the upwelling area show a general trend of cooling waters taking place in the last 700 years. since the present upwelling is dependent on local and remote wind regime, a phase of dominating ne winds favors a more effective upward transport of the cold thermocline level south atlantic centralwater towards the coast. the intensification in the upwelling regime for the last ca. 700 years can be associated with the strengthening of the ne winds off the area and a possible increase of the brazil current mesoscale activity. nevertheless, the lack of significant correlation of the paleotemperatures and most of sedimentological parameters indicate that upwelling is not the only sedimentation mechanism in the area. also, the comparison of sedimentological parameters reveals that eventual temporal changes are superimposed by the geographical variability. sedimentation rates vary from 0.26 mm.yr-1 to 0.66 mm.yr-1.
Association between mental health screening by self-report questionnaire and insomnia in medical students
Loayza H., Maria Paz;Ponte, Talles S.;Carvalho, Clarissa G.;Pedrotti, Michell R.;Nunes, Paula V.;Souza, Camila M.;Zanette, Camila B.;Voltolini, Sara;Chaves, Marcia L. F.;
Arquivos de Neuro-Psiquiatria , 2001, DOI: 10.1590/S0004-282X2001000200005
Abstract: epidemiological research points to the high prevalence of psychiatric disorders among insomniacs. we carried out a cross-sectional study with medical students with the aim of evaluating the association between insomnia and suspicion of psychiatric disorder; 302 medical students were included (184 males and 118 females; mean age = 20.47±1.89 years). the main association was tested by logistic regression analysis. the overall prevalence of positivity in a screening test for psychiatric disorder was 22.19%; and of insomnia, 28.15%. difficulty initiating sleep (or=3.45), difficulty maintaining sleep (or=7.61), falling asleep later (or=1.99) and waking up earlier (or=1.91) were associated with suspicion of psychiatric disorder. as a group, the variables difficulty initiating sleep, difficulty maintaining sleep, falling asleep after 11 pm, and waking up before 6 am presented an odds ratio of 5.96 for positivity in the screening for psychiatric disorder. furthermore, difficulty maintaining sleep (or=2.24) was associated with "being female," and falling asleep later (or=0.43) was associated with "being male". these results underscore the importance of determining in what cases difficulty sleeping may have severe clinical repercussions or affect performance.
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