نتایج جستجو برای: diurnal

تعداد نتایج: 15614  

Journal: :Neuro endocrinology letters 2013
Michael Wirth James Burch John Violanti Cecil Burchfiel Desta Fekedulegn Michael Andrew Hongmei Zhang Diane B Miller Shawn D Youngstedt James R Hébert John E Vena

OBJECTIVE This study evaluated whether measures of waking or diurnal cortisol secretion, or self-reported psychological disturbances differed among police officers with a Period3 (PER3) clock gene length polymorphism. METHODS The cortisol awakening response was characterized via the area under the salivary cortisol curve with respect to the increase (AUCI) or total waking cortisol (AUCG). Diu...

2011
Boualem Khouider

This paper presents a study of the diurnal cycle of tropical precipitation and its interaction with convectively coupled waves in the context of simple models with crude vertical resolution. One and two baroclinic mode models are tested in both the context of a one-column model and the context of full spatial dependency that permits waves to propagate and interact with the diurnal cycle. It is ...

Journal: :Psychoneuroendocrinology 2012
Rebecca Rueggeberg Carsten Wrosch Gregory E Miller

This study examined the long-term associations between reports of sleep duration and diurnal cortisol secretion in older adulthood. It was hypothesized that longer sleep would protect older adults against increases in diurnal cortisol secretion over time. We tested this hypothesis using three waves of data from a 4-year longitudinal study involving 157 older adults. Results from growth curve an...

Journal: :Psychoneuroendocrinology 2015
Emma K Adam Jennifer A Heissel Katharine H Zeiders Jennifer A Richeson Emily C Ross Katherine B Ehrlich Dorainne J Levy Margaret Kemeny Amanda B Brodish Oksana Malanchuk Stephen C Peck Thomas E Fuller-Rowell Jacquelynne S Eccles

Perceived racial discrimination (PRD) has been associated with altered diurnal cortisol rhythms in past cross-sectional research. We investigate whether developmental histories of PRD, assessed prospectively, are associated with adult diurnal cortisol profiles. One-hundred and twelve (N=50 Black, N=62 White) adults from the Maryland Adolescent Development in Context Study provided saliva sample...

2005
Dian J. Seidel Junhong Wang

[1] This study estimates the amplitude and phase of the climatological diurnal cycle of temperature, from the surface to 10 hPa. The analysis is based on four-times-daily radiosonde data from 53 stations in four regions in the Northern Hemisphere, equatorial soundings from the Tropical Ocean Global Atmosphere/Coupled Ocean Atmosphere Response Experiment, and more recent eight-times-daily radios...

Journal: :Psychoneuroendocrinology 2013
Natalia O Dmitrieva David M Almeida Julia Dmitrieva Eric Loken Carl F Pieper

Diurnal cortisol is a marker of HPA-axis activity that may be one of the biological mechanisms linking stressors to age-related health declines. The current study identified day-centered profiles of diurnal cortisol among 1101 adults living in the United States. Participants took part in up to four consecutive days of salivary cortisol collection, assessed at waking, 30min post-waking, before l...

2003
Kell B. Wilson Dennis Baldocchi Eva Falge Marc Aubinet Paul Berbigier Christian Bernhofer Han Dolman Chris Field Allen Goldstein Andre Granier Dave Hollinger Gabriel Katul B. E. Law Tilden Meyers John Moncrieff Russ Monson John Tenhunen Riccardo Valentini Shashi Verma Steve Wofsy

[1] Data from a network of eddy covariance stations in Europe and North America (FLUXNET) were analyzed to examine the diurnal patterns of surface energy and carbon fluxes during the summer period across a range of ecosystems and climates. Diurnal trends were quantified by assessing the time of day surface fluxes and meteorological variable reached peak values, using the ‘‘diurnal centroid’’ me...

2014
Quan Gan Jian Du William E Ward Stephen R Beagley Victor I Fomichev Shaodong Zhang

The extended Canadian Middle Atmosphere Model (eCMAM) was recently run in a nudged mode using reanalysis data from the ground to 1 hPa for the period of January 1979 to June 2010 (hence the name eCMAM30). In this paper, eCMAM30 temperature is used to examine the background mean temperature, the spectrum of the diurnal tides, and the climatology of the migrating diurnal tide Dw1 and three nonmig...

2004
Baijun Tian Brian J. Soden Xiangqian Wu

[1] Global high-resolution (3-hourly, 0.1 0.1 longitude-latitude) water vapor (6.7 mm) and window (11 mm) radiances from multiple geostationary satellites are used to document the diurnal cycle of upper tropospheric relative humidity (UTH) and its relationship to deep convection and high clouds in the whole tropics and to evaluate the ability of the new Geophysical Fluid Dynamics Laboratory (GF...

2014

The diurnal variation of ozone in the stratosphere and lower mesosphere is analyzed using data from a ground-based microwave radiometer operating at the Mauna Loa NDACC station since the 1990s. Presented are considerations concerning the internal quality of the measurements, a verification study of the quality of the observed diurnal variability in comparison with external data sets obtained fr...

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