Refinar búsqueda
Resultados 1-10 de 25,785
Pedometer determined physical activity tracks in African American adults: The Jackson Heart Study Texto completo
2012
Newton, Robert L Jr | M, Hongmei Han | Dubbert, Patricia M. | Johnson, William D. | Hickson, DeMarc A | Ainsworth, Barbara | Carithers, Teresa | Taylor, Herman | Wyatt, Sharon | Tudor-Locke, Catrine
Pedometer determined physical activity tracks in African American adults: The Jackson Heart Study Texto completo
2012
Newton, Robert L Jr | M, Hongmei Han | Dubbert, Patricia M. | Johnson, William D. | Hickson, DeMarc A | Ainsworth, Barbara | Carithers, Teresa | Taylor, Herman | Wyatt, Sharon | Tudor-Locke, Catrine
BACKGROUND: This study investigated the number of pedometer assessment occasions required to establish habitual physical activity in African American adults. METHODS: African American adults (mean age 59.9 ± 0.60 years; 59 % female) enrolled in the Diet and Physical Activity Substudy of the Jackson Heart Study wore Yamax pedometers during 3-day monitoring periods, assessed on two to three distinct occasions, each separated by approximately one month. The stability of pedometer measured PA was described as differences in mean steps/day across time, as intraclass correlation coefficients (ICC) by sex, age, and body mass index (BMI) category, and as percent of participants changing steps/day quartiles across time. RESULTS: Valid data were obtained for 270 participants on either two or three different assessment occasions. Mean steps/day were not significantly different across assessment occasions (p values > 0.456). The overall ICCs for steps/day assessed on either two or three occasions were 0.57 and 0.76, respectively. In addition, 85 % (two assessment occasions) and 76 % (three assessment occasions) of all participants remained in the same steps/day quartile or changed one quartile over time. CONCLUSION: The current study shows that an overall mean steps/day estimate based on a 3-day monitoring period did not differ significantly over 4 – 6 months. The findings were robust to differences in sex, age, and BMI categories. A single 3-day monitoring period is sufficient to capture habitual physical activity in African American adults.
Mostrar más [+] Menos [-]Pedometer determined physical activity tracks in African American adults: The Jackson Heart Study Texto completo
2012
Newton Robert L | M Hongmei | Dubbert Patricia M | Johnson William D | Hickson DeMarc A | Ainsworth Barbara | Carithers Teresa | Taylor Herman | Wyatt Sharon | Tudor-Locke Catrine
<p>Abstract</p> <p>Background</p> <p>This study investigated the number of pedometer assessment occasions required to establish habitual physical activity in African American adults.</p> <p>Methods</p> <p>African American adults (mean age 59.9 ± 0.60 years; 59 % female) enrolled in the Diet and Physical Activity Substudy of the Jackson Heart Study wore Yamax pedometers during 3-day monitoring periods, assessed on two to three distinct occasions, each separated by approximately one month. The stability of pedometer measured PA was described as differences in mean steps/day across time, as intraclass correlation coefficients (ICC) by sex, age, and body mass index (BMI) category, and as percent of participants changing steps/day quartiles across time.</p> <p>Results</p> <p>Valid data were obtained for 270 participants on either two or three different assessment occasions. Mean steps/day were not significantly different across assessment occasions (p values > 0.456). The overall ICCs for steps/day assessed on either two or three occasions were 0.57 and 0.76, respectively. In addition, 85 % (two assessment occasions) and 76 % (three assessment occasions) of all participants remained in the same steps/day quartile or changed one quartile over time.</p> <p>Conclusion</p> <p>The current study shows that an overall mean steps/day estimate based on a 3-day monitoring period did not differ significantly over 4 – 6 months. The findings were robust to differences in sex, age, and BMI categories. A single 3-day monitoring period is sufficient to capture habitual physical activity in African American adults.</p>
Mostrar más [+] Menos [-]Hair cortisol levels determined at different body sites in the New Zealand White rabbit Texto completo
2012
Antonella Comin | Valentina Zufferli | Tanja Peric | Federico Canavese | Davide Barbetta | Alberto Prandi
<p>This study was designed to determine hair cortisol levels in the New Zealand White (NZW) rabbit and to examine possible differences in the cortisol levels of hair samples collected from different body regions in stable environmental conditions. The experiment was performed on eight 18 month-old female NZW rabbits. All animals were shaved to collect hair samples from 26 different body regions. Hair cortisol levels were determined by the RIA method. The mean hair cortisol concentration for the 26 samples in the 8 animals was 2.12±0.05 pg/mg (mean±standard error). This study reveals individual hair cortisol distributions in the 8 animals (<em>P</em><0.001) and no statistical differences (<em>P</em>>0.05) in hair cortisol levels among the different body sites in each of the animals.</p>
Mostrar más [+] Menos [-]Hair cortisol levels determined at different body sites in the New Zealand White rabbit Texto completo
2012
Comin, Antonella | Zufferli, Valentina | Peric, Tanja | Canavese, Federico | Barbetta, Davide | Prandi, Alberto
This study was designed to determine hair cortisol levels in the New Zealand White (NZW) rabbit and to examine possible differences in the cortisol levels of hair samples collected from different body regions in stable environmental conditions. The experiment was performed on eight 18 month-old female NZW rabbits. All animals were shaved to collect hair samples from 26 different body regions. Hair cortisol levels were determined by the RIA method. The mean hair cortisol concentration for the 26 samples in the 8 animals was 2.12±0.05 pg/mg (mean±standard error). This study reveals individual hair cortisol distributions in the 8 animals (P<0.001) and no statistical differences (P>0.05) in hair cortisol levels among the different body sites in each of the animals.
Mostrar más [+] Menos [-]Errors in water retention curves determined with pressure plates: Effects on the soil water balance Texto completo
2012
Solone, R. | Bittelli, M. | Tomei, F. | Morari, F.
Pressure plates apparatus are very common experimental devices utilized to measure the soil water retention curve. Many studies have demonstrated the lack of reliability of pressure plates apparatus when they are used to measure the soil water retention curve in the dry range, due to low plate and soil conductance, lack of hydrostatic equilibrium, lack of soil–plate contact and soil dispersion. In this research, we investigated measurements of soil water retention curves obtained with a combination of Stackman’s tables, pressure plates apparatus and the chilled-mirror dew point technique. Specifically, the aim of this research was: (a) to investigate the differences in the measured soil water retention curves by the different experimental methods, (b) evaluate relationships between the experimental differences and soil texture, (c) analyze the effect of experimental differences on hydraulic properties parameterization and (d) investigate the effects of the different parameters set on water transport computation. The results showed differences in measurements made by the combination of Stackman’s tables and Richards’ pressure plates apparatus as compared to the dew point method, for fine textured soils, while no significant differences were detected for coarse textured soils. Computed cumulative drainage and evaporation displayed lower values if soil water retention curves were obtained from data obtained with the Stackman’s tables and Richards’ pressure plates apparatus instead of the dew point method. In soils, where the soil water retention curve was measured with traditional methods (Stackman’s tables and Richards’ pressure plates apparatus) average cumulative drainage was 173mm, with respect to a combination of methods including the dew point methods, where the average cumulative drainage was 184mm. Average cumulative evaporation was 77mm for the traditional methods, while it was 91mm, for the combination of methods. Overall, when simulation models are used for studies related to solute transport, polluted soil remediation, irrigation management and others, erroneous measurement of the SWRC for fine textured soils, may lead to erroneous computation of the soil water balance.
Mostrar más [+] Menos [-]Biological efficacy of the chemical chrysanthemums protection with the use of fine and coarse droplets Texto completo
2012
Stanislaw PARAFINIUK | Marek KOPACKI
Studies of three years (2007-2009) were conducted at Czesławice in south- east of Poland .The objects of research were the plants of the one cultivar of chrysanthemum: Dark Tripoli. The following agents were used for protection: Dithane NeoTec 75 WG, Sumilex 500 SC, Amistar 250 SC. The treatment was carried out with the use of two types of nozzles: standard RS-MM 110 03 and ejector type ID 120 03 C. Observation was carried out once a year: in October. The number and health status of plants were determined and diseased plants were collected for analysis. The percentage of plants with disease symptoms was estimated for each plot. The best health status and yield were noticed for Amistar 250 SC.
Mostrar más [+] Menos [-]Caracterización de tres nuevas variedades de vignas (‘IPA 206’ e ‘IPA 207’ y ‘Guariba’) en Cuba. Texto completo
2012
Yadelys Figueroa Aguila | José Ventura Martín | Sergio Rodríguez Morales
RESUMEN La investigación se desarrolló sobre un suelo Pardo mullido medianamente lavado con las variedades de vignas (‘IPA 206’, ‘IPA 207’ y ‘Guariba’) de reciente introducción en nuestro país. Tiene como principal objetivo caracterizar las variedades (‘IPA 206, ‘IPA 207’ y ‘Guariba’) bajo nuestras condiciones climáticas. Teniendo como principales resultados que se logró incluir en el registro de variedades según la caracterización desarrollada por nuestro instituto utilizando dos épocas de siembra, el hábitos de crecimiento indeterminado con vainas distribuidas por toda la planta se destaca en las variedades ‘IPA 206’ e ‘IPA 207’, mientras que en la ‘Guariba’ es determinado encontrándose estas distribuidas por encima de la planta, en cuanto al rendimiento, la variedad ‘IPA 207’ es superiores que la obtenida por la ‘'PA 206’ y ‘Guariba’, el peso de 1000 semillas en las variedades ‘Guariba’ y ‘IPA 206’ son superiores al peso de la ‘IPA 207’, la variedad ‘Guariba’ es económicamente más rentable que las ‘IPA 206’ y ‘IPA 207’ por emplear un número de cosechas muy inferior a las antes mencionadas. Puede sembrarse durante todas las épocas del año, pero lo más aconsejable es en época de frío para la obtención de semilla y el verano para la producción donde es más productiva y puede sustituir al fríjol común. Tolera estrés hídrico y régimen de abundantes lluvias, excepto en el momento de la cosecha y no admite el encharcamiento. Characterization of three new varieties vignas (' IPA 206' and ' IPA 207' y 'Guariba') in Cuba. ABSTRACT The research was conducted on a fairly soft Brown soil washing vignas varieties ('IPA 206', 'IPA 207' and 'Guariba') recently introduced in our country. Its main objective is to characterize varieties ('IPA 206,' IPA 207 'and' Guariba ') under our climatic conditions. Having as main results achieved include in the record as the characterization of varieties developed by our institute using two seasons, the indeterminate growth habit with pods distributed throughout the plant stands in the varieties' IPA 206 'and' IPA 207 ', while the' Guariba 'is determined by finding these distributed over the plant, as regards the yield, the variety' IPA 207 'is higher than that obtained by PA 206''' and 'Guariba', the weight of 1000 seed varieties 'Guariba' and 'IPA 206' are greater than the weight of the 'IPA 207', the variety 'Guariba' is economically more profitable than the 'IPA 206' and 'IPA 207' by employing a number crop much lower than those above. It can be sown during all seasons, but it is best in cold weather to obtain seed and summer to produce where it is more productive and can replace the common bean. Tolerate wate
Mostrar más [+] Menos [-]New sources of compact spike morphology determined by the genes on chromosome 5A in hexaploid wheat Texto completo
2012
Kosuge, K. | Watanabe, N. | Melnik, V. M. | Laikova, L. I. | Goncharov, N. P.
Little is known about the relationship between compact spike loci in hexaploid wheat species. We studied two new compact spike mutants of common wheat Triticum aestivum L. (2n = 6x = 42, genome formula BBAADD). The new compact spike genes, C 739 of MCK 739 and Cp of near-isogenic line Mironovskaya 808 (Vrn1), were mapped using aneuploid stocks and microsatellite markers. The C 739 and Cp loci were distally linked with the microsatellite marker Xbarc319 in the F2 populations of MCK 739 × ‘Novosibirskaya 67’ and Cp-Mironovskaya 808 (Vrn1) × ‘Saratovskaya 29’. It was evident that the loci affecting compact spikes in T. aestivum mutants were located on chromosome 5AL distal from Q locus. These loci also affected to semi-dwarfism. We named this locus Cp1 (C ompact p lant 1) for all accessions. Cp1 was allelic to C 17648 gene located on the chromosome 5AL of tetraploid wheat [Triticum durum Desf. (2n = 4x = 28, genome formula BBAA)]. These dominant genes on chromosome 5AL will be utilized as new gene resources of compact spike morphology in hexaploid wheat. Relationship between loci Q and Cp1 was also discussed.
Mostrar más [+] Menos [-]Content of the Alternaria mycotoxin tenuazonic acid in food commodities determined by a stable isotope dilution assay Texto completo
2012
Asam, Stefan | Lichtenegger, Martina | Liu, Yang | Rychlik, Mike
The Alternaria mycotoxin tenuazonic acid (TA) was quantified in fruit juices (n = 50), cereals (n = 12) and spices (n = 38) using a recently developed stable isotope dilution assay (SIDA). [13 C6,15 N]-TA was used as the internal standard. Method validation revealed low limits of detection (LODs) of 0.15 μg/kg (fruit juices), 1.0 μg/kg (cereals) and 17 μg/kg (spices). The respective limits of quantitation were about three times higher. Recovery was about 100% for all matrices. The precision (relative standard deviation of replicate analyses of naturally contaminated samples) was 4.2% (grape juice; 1.7 μg/kg), 3.5% (whole wheat flour; 36 μg/kg) and 0.9% (curry powder; 215 μg/kg). The median content of TA in the analyzed samples was 1.8 μg/kg (fruit juices), 16 μg/kg (cereals) and 500 μg/kg (spices). Positive samples amounted to 86% (fruit juices), 92% (cereals) and 87% (spices).
Mostrar más [+] Menos [-]Extension direction determined by magnetic fabrics in the Triassic red beds of the western High Atlas, Morocco (Argana basin) Texto completo
2012
Oliva-Urcia, Belén | Casas Cendoya, Ana María | Villalaín, Juan J. | El Ouardi, H. | Moussaid, B. | Torres-López, S. | Soto, Ruth | Román-Berdiel, T.
info:eu-repo/grantAgreement/EC/FP7/ | Peer Reviewed
Mostrar más [+] Menos [-]