Consulta: subjectFacets:"Circadian rhythm"
Registros recuperados: 24
Data/hora: 03/06/2024 05:27:12

Genetic variations in circadian rhythm genes and susceptibility for myocardial infarction
Provedor de dados: 74
Autores: Škrlec,Ivana; Milic,Jakov; Heffer,Marija; Peterlin,Borut; Wagner,Jasenka.
Abstract Disruption of endogenous circadian rhythms has been shown to increase the risk of developing myocardial infarction (MI), suggesting that circadian genes might play a role in determining disease susceptibility. We conducted a case-control study on 200 patients hospitalized due to MI and 200 healthy controls, investigating the association between MI and single nucleotide polymorphisms (SNPs) in four circadian genes (ARNTL, CLOCK, CRY2, and PER2). The variants of all four genes were chosen based on their previously reported association with cardiovascular risk factors, which have a major influence on the occurrence of myocardial infarction. Statistically significant differences, assessed through Chi-square analysis, were found in genotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular diseases; Circadian rhythm; Myocardial infarction; Polymorphisms.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300403

Interactions of polymorphisms in different clock genes associated with circadian phenotypes in humans
Provedor de dados: 74
Autores: Pedrazzoli,Mario; Secolin,Rodrigo; Esteves,Luiz Otávio Bastos; Pereira,Danyella Silva; Koike,Bruna Del Vechio; Louzada,Fernando Mazzili; Lopes-Cendes,Iscia; Tufik,Sergio.
Several studies have shown that mutations and polymorphisms in clock genes are associated with abnormal circadian parameters in humans and also with more subtle non-pathological phenotypes like chronotypes. However, there have been conflicting results, and none of these studies analyzed the combined effects of more than one clock gene. Up to date, association studies in humans have focused on the analysis of only one clock gene per study. Since these genes encode proteins that physically interact with each other, combinations of polymorphisms in different clock genes could have a synergistic or an inhibitory effect upon circadian phenotypes. In the present study, we analyzed the combined effects of four polymorphisms in four clock genes (Per2, Per3, Clock...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clock genes; Gene interaction; Morningness-eveningness; Sleep; Circadian rhythm.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400005

Seasonal and diel variation in the fish assemblage of a Neotropical delta in southern Brazil
Provedor de dados: 76
Autores: Saccol-Pereira,Adriana; Fialho,Clarice B.
The objective of this study was to identify the patterns of seasonal and diel variation and the most important abiotic factors that influence variation in the fish assemblage of the Delta of the Jacuí River in southern Brazil. Seventy-two samples were collected over a one year period. Water temperature was the abiotic factor with the greatest influence on the distribution of the assemblage. The structure of the assemblage exhibited significant changes in terms of species abundance and biomass during the year, with the greatest abundance and biomass being observed during the autumn. There was no significant difference between day and night in terms of abundance, but biomass was significantly greater during the night than during the day.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Fish ecology; Freshwater fish; Biological rhythm; Circadian rhythm; Patos Lagoon.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000200013

Transcriptomic response to parasite infection in Nile tilapia (Oreochromis niloticus) depends on rearing density
Provedor de dados: 5
Autores: Ellison, Amy R.; Uren Webster, Tamsyn M.; Rey, Olivier; Garcia De Leaniz, Carlos; Consuegra, Sofia; Orozco-terwengel, Pablo; Cable, Jo.
Background: Captive animal populations, be it for food production or conservation programmes, are often maintained at densities far beyond those in natural environments, which can have profound effects on behaviour, immune and stress levels, and ultimately welfare. How such alterations impact transcriptional responses to pathogen infection is a 'different kettle of fish' and remains poorly understood. Here, we assessed survival and gene expression profiles of infected fish reared at two different densities to elucidate potential functional genomic mechanisms for density-related differences in disease susceptibility. Results: Utilising a whole-transcriptome sequencing (RNAseq) approach, we demonstrate that rearing density in tilapia (Oreochromis niloticus)...
Tipo: Text
Palavras-chave: Stocking density; Stress; Saprolegnia; Aquaculture; Transcriptome; Tilapia; Circadian rhythm; Disease risk.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00462/57353/78952.pdf

Influence of photoperiod on growth, uniformity, and survival of larvae of the Amazonian ornamental  Heros severus (Heckel, 1840)
Provedor de dados: 96
Autores: Veras,Galileu Crovatto; Paixão,Daércio José de Macedo Ribeiro; Brabo,Marcos Ferreira; Soares,Lourdes Marília Oliveira; Sales,Abner Dias.
ABSTRACT The objective of this work was to evaluate the influence of photoperiod on growth, uniformity, and survival of larvae of the Amazonian ornamental fish severum (Heros severus). A completely randomized study was used with five treatments (0L:24D, 6L:18D, 12L:12D, 18L:6D, 24L:0D) and four replicates, with the aquaria as the experimental unit. Two hundred severum larvae (3.20±0.16 mg and 5.60±0.00 mm) were distributed into 20 aquariums of one litre at a density of 10 larvae per litre. For a period of 15 days, feed was supplied four times daily with Artemia nauplii in a proportion of 160 nauplii/larvae/feeding. At the end of the experimental period, growth, uniformity, and survival data were subjected to analyses of variance and significance....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Circadian rhythm; Hatchery; Live food; Ornamental fish; Severum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000700422

Evaporative water loss and dehydration during the night in hummingbirds
Provedor de dados: 97
Autores: HARTMAN BAKKEN,BRADLEY; SABAT,PABLO.
Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoides sephanoides), a Chilean hummingbird. We hypothesized that a circadian rhythm in TEWL would assuage the dehydration risk that hummingbirds face during the night. However, we did not find support for this idea. In resting hummingbirds, rates of TEWL during the day (54 ±6 µLh-1,n = 8) and night (65 ± 12 h-1, n = 5) were similar. Rates of MWP were also similar between the day (22 ±3 µL h-1, n = 8) and night (23 ± 2 µL h-1, n = 5). MWP rates were significantly...
Tipo: Journal article
Palavras-chave: Circadian rhythm; Evaporative water loss; Hummingbird; Osmoregulation; Water balance.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001

BEHAVIOR OF Pectinophora gossypiella (GELECHIIDAE) (PINK BOLLWORM) MALES MONITORED WITH PHEROMONE TRAP IN COTTON
Provedor de dados: 37
Autores: PONTES DE MELO,ELMO; DEGRANDE,PAULO EDUARDO; AVEIRO CESSA,RAPHAEL MAIA; DOS SANTOS DE LIMA JUNIOR,IZIDRO; BARROS,RICARDO; FERNANDES NOGUEIRA,RODRIGO.
The objective of the present study was to evaluate the behavior of P. gossypiella males captured with pheromone-baited traps in cotton field. Three experiments were done during the 2001-02 and 2002-03 growing seasons using the Delta Opal cotton cultivar. The first experiment was related to the insect population captured during the crop cycle by of two commercially available Delta type traps, the second experiment was conducted to evaluate the efficiency of traps in capturing P. gossypiella males and, the third experiment assessed the nocturnal circadian rhythm. It was realized a descriptive analysis of the data collected to first and third experiment. Used in this second experiment consisted of comparing randomly selected groups, and the means were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pink bollworm; Delta trap; Circadian rhythm.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000300012

Can a small change in the tilapia’s on-going feeding strategy impair its growth? - doi: 10.4025/actascianimsci.v35i3.18290
Provedor de dados: 2
Autores: Caldini, Nayara Nunes; Universidade Federal do Ceará; Pereira, Nayagra Vidal; Universidade Federal do Ceará; Rebouças, Vanessa Tomaz; Universidade Federal do Ceará; Sá, Marcelo Vinícius do Carmo e; UFC.
The aim of the present work was to answer the following question: can a small change in the tilapia’s on-going feeding strategy impair its growth? In the initial phase of the study, fish were evenly distributed and maintained for two weeks in four tanks. In tanks 1 and 2, the ration was given in three equal meals at 8, 12 and 16h or at 9, 13 and 17h, respectively. In tanks 3 and 4, there was only one daily meal at 9 or 10 o’clock, respectively. In the second 8-week phase, fish from tank 1 were distributed into two groups in ten 100-L tanks: the 8-12-16 group, in which fish were always fed at 8, 12 and 16h; and the 8-12-16/9-13-17 group, in which fish were fed at 8, 12 and 16h in the first four weeks and at 9, 13 and 17h in the last four weeks. Fish from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding schedule; Circadian rhythm; Feeding management; Fish culture Feeding schedule; Circadian rhythm; Feeding management; Fish culture.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/18290

Chronobiologic blood pressure assessment: Maturation of the daily rhythm in newborn foals
Provedor de dados: 48
Autores: PICCIONE,GIUSEPPE; ASSENZA,ANNA; FAZIO,FRANCESCO; GIANNETTO,CLAUDIA; CAOLA,GIOVANNI.
Circadian rhythmicity of physiological processes in animals has been described for some variables. In order to investigate the daily rhythmicity of blood pressure, seven foals (Equus caballus) were used for 40 days after birth. Measurements of blood pressure were done by means of an oscillometric apparatus (Argus TM-7, Schiller, Barr Switzerland) with the foals in a standing position and the cuff placed around the tail. Blood pressure was recorded twice a day, 1 hour before dawn and 1 hour before dusk for the first 10 days of life, every 2 days from the 11th to the 32nd day, on the 36th and on the 40th day. Two-way repeated measures analysis of variance (ANOVA) were used to determine statistically significant differences between the mean values recorded at...
Tipo: Journal article
Palavras-chave: Blood pressure; Circadian rhythm; Chronophisiology; Foals; Equus caballus.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100007

Plasticity in the timing of activity in the Red-rumped Agouti, Dasyprocta leporina (Mammalia: Rodentia), in the Atlantic Forest of southeastern Brazil
Provedor de dados: 49
Autores: Magalhães,Laura Martins; Srbek-Araujo,Ana Carolina.
Abstract Timing of activity is a consequence of adaptations to daily and seasonal changes in the environment and examining these patterns is important to better understand the temporal niches of the species. Here we examine temporal activity in the Red-rumped Agouti (Dasyprocta leporina) in two fragments of Atlantic Forest and those factors that influence the circadian rhythm in the study areas. Camera traps were used to gather data in two protected areas (one montane and other coastal) in the state of Espírito Santo, southeastern Brazil. A total of 49 photos were taken in the mountains and 152 in the coastal area. Activity patterns were diurnal and bimodal, and animals were active for 14-15 hours each day. Activity peaked in the morning soon after sunrise...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dasyproctidae; Abiotic factors; Activity patterns; Circadian rhythm; Photoperiod.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200204

Evaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758)
Provedor de dados: 62
Autores: TONIOLLO,Gilson Hélio; VICENTE,Wilter Ricardo Russiano; OLIVEIRA,Claudio Alvarenga de; CIPPOLA NETO,José.
Aiming at the evaluation of the occurrence of thyroxine and progesterone-17-alpha-OH circadian rhythm, 4 adult crossbred swine females (non-pregnant and showing no estrous signs) were studied, reared and kept under a industrial management system. Hormone determinations were assessed by solid phase radioimmunoassay (RIA)ª. Thyroxine serum analysis showed the highest concentrations around 3:00 PM and decreased until reaching the lowest values at the 0:00 to 4:00 AM interval. Regarding progesterone-17-alpha-OH, the highest concentrations were observed at 3:00 AM, showing a progressive decrease along the day until reaching lower values at the 12:00 to 3:00 PM interval.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Circadian rhythm; Hormone; Swine.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000400010

Daily blood pressure profile in Cushing's syndrome before and after surgery
Provedor de dados: 56
Autores: Kreze,A.; Mikulecky,M.
No significant difference has been demonstrated in the altered circadian blood pressure pattern between the pituitary-dependent and adrenal forms of Cushing's syndrome before surgery. The effect of therapy, however, proved to be different. The mesor was normalized in the pituitary-dependent Cushing's syndrome more conspicuously for systolic than for diastolic blood pressure. In Cushing's syndrome due to adrenal adenoma, systolic and diastolic blood pressure mesors have been even significantly "overnormalized" after treatment, being 11 to 27 and 2 to 13 mmHg (95% confidence) lower than corresponding mesors in controls. There was no difference between forms in the effect of treatment on blood pressure amplitudes, which remained significantly lower than in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cushing's syndrome; Pituitary-dependent Cushing's syndrome; Cushing's syndrome due to adrenal adenoma; Blood pressure; Circadian rhythm; Surgery.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000004

Food and the circadian activity of the hypothalamic-pituitary-adrenal axis
Provedor de dados: 56
Autores: Leal,A.M.O.; Moreira,A.C.
Temporal organization is an important feature of biological systems and its main function is to facilitate adaptation of the organism to the environment. The daily variation of biological variables arises from an internal time-keeping system. The major action of the environment is to synchronize the internal clock to a period of exactly 24 h. The light-dark cycle, food ingestion, barometric pressure, acoustic stimuli, scents and social cues have been mentioned as synchronizers or" zeitgebers". The circadian rhythmicity of plasma corticosteroids has been well characterized in man and in rats and evidence has been accumulated showing daily rhythmicity at every level of the hypothalamic-pituitary-adrenal (HPA) axis. Studies of restricted feeding in rats are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding; Glucocorticoids; CRH; ACTH; Circadian rhythm.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001200003

Relationship between Brazilian airline pilot errors and time of day
Provedor de dados: 56
Autores: de Mello,M.T.; Esteves,A.M.; Pires,M.L.N.; Santos,D.C.; Bittencourt,L.R.A.; Silva,R.S.; Tufik,S.
Flight safety is one of the most important and frequently discussed issues in aviation. Recent accident inquiries have raised questions as to how the work of flight crews is organized and the extent to which these conditions may have been contributing factors to accidents. Fatigue is based on physiologic limitations, which are reflected in performance deficits. The purpose of the present study was to provide an analysis of the periods of the day in which pilots working for a commercial airline presented major errors. Errors made by 515 captains and 472 copilots were analyzed using data from flight operation quality assurance systems. To analyze the times of day (shifts) during which incidents occurred, we divided the light-dark cycle (24:00) in four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Airline pilot errors; Circadian rhythm.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001200014

Low-cost automatic activity data recording system
Provedor de dados: 56
Autores: Moraes,M.F.D.; Ferrarezi,C.; Mont'Alverne,F.J.A.; Garcia-Cairasco,N.
We describe a low-cost, high quality device capable of monitoring indirect activity by detecting touch-release events on a conducting surface, i.e., the animal's cage cover. In addition to the detecting sensor itself, the system includes an IBM PC interface for prompt data storage. The hardware/software design, while serving for other purposes, is used to record the circadian activity rhythm pattern of rats with time in an automated computerized fashion using minimal cost computer equipment (IBM PC XT). Once the sensor detects a touch-release action of the rat in the upper portion of the cage, the interface sends a command to the PC which records the time (hours-minutes-seconds) when the activity occurred. As a result, the computer builds up several files...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Circadian rhythm; Automated acquisition; Actograms; FFT; Cosinor; Chronobiology.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000800015

Diurnal variation of vascular diameter and reactivity in healthy young men
Provedor de dados: 56
Autores: Bau,P.F.D.; Bau,C.H.D.; Naujorks,A.A.; Rosito,G.A.; Fuchs,F.D.
The higher incidence of cardiovascular events in the morning is accompanied by an increased vascular tone. However, there are few published studies designed to evaluate the diurnal variation of vascular and endothelial parameters in healthy subjects. In the present investigation, we evaluated the diurnal variation in brachial artery diameter (BAD), flow-mediated dilation (FMD) and endothelium-independent dilation (NFMD) in a homogeneous sample of healthy non-smoker young men. Fifty subjects aged 20.8 ± 0.3 years (range: 18 to 25 years) were investigated by brachial artery ultrasound. Exclusion criteria were female gender and evidence of clinically significant health problems, including obesity. Volunteers were asked to rest and avoid fat meals as well as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular risk factor; Circadian rhythm; Brachial artery; Vasoconstriction; Vascular biology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000600011

Melatonin and N-acetyl-serotonin cross the red blood cell membrane and evoke calcium mobilization in malarial parasites
Provedor de dados: 56
Autores: Hotta,C.T.; Markus,R.P.; Garcia,C.R.S.
The duration of the intraerythrocytic cycle of Plasmodium is a key factor in the pathogenicity of this parasite. The simultaneous attack of the host red blood cells by the parasites depends on the synchronicity of their development. Unraveling the signals at the basis of this synchronicity represents a challenging biological question and may be very important to develop alternative strategies for therapeutic approaches. Recently, we reported that the synchrony of Plasmodium is modulated by melatonin, a host hormone that is synthesized only during the dark phases. Here we report that N-acetyl-serotonin, a melatonin precursor, also releases Ca2+ from isolated P. chabaudi parasites at micro- and nanomolar concentrations and that the release is blocked by 250...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malaria; Plasmodium; Calcium; Melatonin; Circadian rhythm; Host-parasite interaction.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001100016

Influence of chronotype and social zeitgebers on sleep/wake patterns
Provedor de dados: 56
Autores: Korczak,A.L.; Martynhak,B.J.; Pedrazzoli,M.; Brito,A.F.; Louzada,F.M.
Inter-individual differences in the phase of the endogenous circadian rhythms have been established. Individuals with early circadian phase are called morning types; those with late circadian phase are evening types. The Horne and Östberg Morningness-Eveningness Questionnaire (MEQ) is the most frequently used to assess individual chronotype. The distribution of MEQ scores is likely to be biased by several fact, ors, such as gender, age, genetic background, latitude, and social habits. The objective of the present study was to determine the effect of different social synchronizers on the sleep/wake cycle of persons with different chronotypes. Volunteers were selected from a total of 1232 UFPR undergraduate students who completed the MEQ. Thirty-two subjects...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chronotype; Sleep/wake cycle; Morning types; Evening types; Circadian rhythm; Social zeitgebers.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001000014

Circadian rhythms in blood pressure in free-ranging three-toed sloths (Bradypus variegatus)
Provedor de dados: 56
Autores: Duarte,D.P.F.; Silva,V.L.; Jaguaribe,A.M.; Gilmore,D.P.; Da Costa,C.P.
Blood pressure (BP) profiles were monitored in nine free-ranging sloths (Bradypus variegatus) by coupling one common carotid artery to a BP telemetry transmitter. Animals moved freely in an isolated and temperature-controlled room (24ºC) with 12/12-h artificial light-dark cycles and behaviors were observed during resting, eating and moving. Systolic (SBP) and diastolic (DBP) blood pressures were sampled for 1 min every 15 min for 24 h. BP rhythm over 24 h was analyzed by the cosinor method and the mesor, amplitude, acrophase and percent rhythm were calculated. A total of 764 measurements were made in the light cycle and 721 in the dark cycle. Twenty-four-hour values (mean ± SD) were obtained for SBP (121 ± 22 mmHg), DBP (86 ± 17 mmHg), mean BP (MBP, 98 ±...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Sloths; Bradypus; Circadian rhythm; Blood pressure.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000200016

Comparison of morning and afternoon exercise training for asthmatic children
Provedor de dados: 56
Autores: Silva,C.S.; Torres,L.A.G.M.M.; Rahal,A.; Terra Filho,J.; Vianna,E.O.
Fitness improvement was used to compare morning with afternoon exercise periods for asthmatic children. Children with persistent moderate asthma (according to GINA criteria), 8 to 11 years old, were divided into 3 groups: morning training group (N = 23), afternoon training group (N = 23), and non-training group (N = 23). The program was based on twice a week 90-min sessions for 4 months. We measured the 9-min running distance, resting heart rate and abdominal muscle strength (sit-up number) before and after the training. All children took budesonide, 400 µg/day, and an on demand inhaled ß-agonist. The distance covered in 9 min increased (mean ± SEM) from 1344 ± 30 m by 248 ± 30 m for the morning group, from 1327 ± 30 m by 162 ± 20 m for the afternoon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asthma; Children; Chronotherapy; Exercise training; Circadian rhythm; Exercise-induced bronchospasm.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000100008

Melatonin prevents inflammation and oxidative stress caused by abdominopelvic and total body irradiation of rat small intestine
Provedor de dados: 56
Autores: Guney,Y.; Hicsonmez,A.; Uluoglu,C.; Guney,H.Z.; Ozel Turkcu,U.; Take,G.; Yucel,B.; Caglar,G.; Bilgihan,A.; Erdogan,D.; Nalca Andrieu,M.; Kurtman,C.; Zengil,H.
We investigated the day-night differences in intestinal oxidative-injury and the inflammatory response following total body (TB) or abdominopelvic (AP) irradiation, and the influence of melatonin administration on tissue injury induced by radiation. Rats (male Wistar, weighing 220-280 g) in the irradiated groups were exposed to a dose of 8 Gy to the TB or AP region in the morning (resting period - 1 h after light onset) or evening (activity span - 13 h after light onset). Vehicle or melatonin was administered immediately before, immediately after and 24 h after irradiation (10, 2.0 and 10 mg/kg, ip, respectively) to the irradiated rats. AP (P &lt; 0.05) and TB (P &lt; 0.05) irradiation applied in the morning caused a significant increase in thiobarbituric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irradiation; Melatonin; Circadian rhythm; Oxidative stress; Thiobarbituric acid reactive substances; Myeloperoxidase.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007001000002

Evaluation of behavioral states among morning and evening active healthy individuals
Provedor de dados: 56
Autores: Hidalgo,M.P.; Camozzato,A.; Cardoso,L.; Preussler,C.; Nunes,C.E.; Tavares,R.; Posser,M.S.; Chaves,M.L.F.
The Horne-Östberg questionnaire partly covers some factors that may be important determinants of peak time and characterize patterns of behavior. We conducted a study for the evaluation of self-reported behavioral states (hunger sensation, availability for study, physical exercise, solving daily problems, and time preferences) as expressions of underlying cyclic activity. Three hundred and eighteen community subjects without history of medical, psychiatric, or sleep disorders were evaluated in a cross-sectional design. A self-report about daily highest level of activity was used to categorize individuals into morning, evening, and indifferently active. Time-related behavioral states were evaluated with 23 visual analog questions. The responses to most...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Chronobiology; Morningness; Eveningness; Circadian rhythm; Behavior; Human.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000700012

Circadian cardiac autonomic function in perinatally HIV-infected preschool children
Provedor de dados: 56
Autores: Benchimol-Barbosa,P.R.
The 24-h heart rate variability and QT-interval adaptation was investigated in perinatally HIV-infected preschool children classified according to immunological status in order to assess autonomic function at early stages of infection. Thirty-five perinatally HIV-infected and clinically stable children (4.8 ± 0.3 years) were enrolled after approval of the study by the University Hospital Pedro Ernesto Ethics Committee and written informed parental consent was obtained. The children were classified according to peripheral CD4+ count (cells/µL) as follows: group 1, N = 11 (≥1000); group 2, N = 7 (≥500 and &lt;1000); group 3, N = 17 (&lt;500). Left ventricular ejection fraction (&gt;55%), 24-h RR interval variability (RRV) indexes (NN, SDANN, SDNN index,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autonomic nervous system; Circadian rhythm; Heart rate variability; Human immunodeficiency virus infection; Perinatally HIV-infected children.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000800006

Programmed delivery of verapamil hydrochloride from tablet in a capsule device
Provedor de dados: 60
Autores: Sah,Mukesh Lal; Juyal,Vijay.
The aim of the present work was to develop a programmed drug delivery system which would be able to release the drug after 6 h of lag time by use of hydrophilic polymers. The capsule body was made impermeable by use of formaldehyde vapor treatment, while the cap was untreated. The capsule was filled with two layered tablets (tablet-in-capsule), followed by a sodium bicarbonate:citric acid mixture (SBCM) and lactose as bulking agent. Sodium alginate, chitosan, HPMC K15 and chitosan:sodium alginate complex (CSAC) were used as the rate modulating layer. Through combined use of HPMC K15 and adjusting the ratio of CSAC, the desired lag time of 6 h was obtained. The effect of the bulking agents on the lag time were also studied and it was found that the lag time...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Circadian rhythm; Chitosan/sodium alginate complex; HPMC K15; Lactose; Effervescent mixture.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502012000200007