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- Lembrechts, Jonas J., et al.
(författare)
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SoilTemp : A global database of near-surface temperature
- 2020
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 26:11, s. 6616-6629
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Tidskriftsartikel (refereegranskat)abstract
- Current analyses and predictions of spatially explicit patterns and processes in ecology most often rely on climate data interpolated from standardized weather stations. This interpolated climate data represents long-term average thermal conditions at coarse spatial resolutions only. Hence, many climate-forcing factors that operate at fine spatiotemporal resolutions are overlooked. This is particularly important in relation to effects of observation height (e.g. vegetation, snow and soil characteristics) and in habitats varying in their exposure to radiation, moisture and wind (e.g. topography, radiative forcing or cold-air pooling). Since organisms living close to the ground relate more strongly to these microclimatic conditions than to free-air temperatures, microclimatic ground and near-surface data are needed to provide realistic forecasts of the fate of such organisms under anthropogenic climate change, as well as of the functioning of the ecosystems they live in. To fill this critical gap, we highlight a call for temperature time series submissions to SoilTemp, a geospatial database initiative compiling soil and near-surface temperature data from all over the world. Currently, this database contains time series from 7,538 temperature sensors from 51 countries across all key biomes. The database will pave the way toward an improved global understanding of microclimate and bridge the gap between the available climate data and the climate at fine spatiotemporal resolutions relevant to most organisms and ecosystem processes.
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- Pitteloud, N, et al.
(författare)
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Relationship between testosterone levels, insulin sensitivity, and mitochondrial function in men
- 2005
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Ingår i: Diabetes Care. - 1935-5548. ; 28:7, s. 1636-1642
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE - The goal of this study was to examine the relationship between serum testosterone levels and insulin sensitivity and mitochondrial function in men, RESEARCH DESIGN AND METHODS - A total of 60 men (mean age 60.5 +/- 1.2 years) had a detailed hormonal and metabolic evaluation. Insulin sensitivity was measured Using a hyperinsulinemic-euglycemic clamp. Mitochondrial function was assessed by measuring maximal aerobic capacity (Vo(2max)) and expression of oxidative phosphorylation gene,, in skeletal muscle, RESULTS - A total of 45% of subjects had normal glucose tolerance, 20% had impaired glucose tolerance, and 35% had type 2 diabetes. Testosterone levels were correlated with insulin sensitivity (r = 0.4, P < 0.005). Subjects with hypogonadal testosterone levels (n = 10) had a BMI > 25 kg/m(2) and a threefold higher prevalence of the metabolic syndrome than their eugonadal counterparts (n = 50) this relationship held true after adjusting for age and sex hormone-binding globulin but not BMI. Testosterone levels also correlated with (Vo(2max),11 0 = 0.43, P < 0.05) and oxidative phosphorylation gene expression (r = 0.57, P < 0.0001). CONCLUSIONS - These data indicate that low serum testosterone levels are associated with an adverse metabolic profile and suggest a novel unifying mechanism for the previously independent observations that low testosterone levels and impaired mitochondrial function promote insulin resistance in men.
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