12 research outputs found
Biocompatibility of PLGA/sP(EO-stat-PO)-Coated Mesh Surfaces under Constant Shearing Stress
Citizens’ use of policy symbols and frames
Public policy, Interpretive methods, Education policy, Desegregation, Policy narratives, Policy symbols,
Broken R-Parity in the Sky and at the LHC
Supersymmetric extensions of the Standard Model with small R-parity and
lepton number violating couplings are naturally consistent with primordial
nucleosynthesis, thermal leptogenesis and gravitino dark matter. We consider
supergravity models with universal boundary conditions at the grand unification
scale, and scalar tau-lepton or bino-like neutralino as next-to-lightest
superparticle (NLSP). Recent Fermi-LAT data on the isotropic diffuse gamma-ray
flux yield a lower bound on the gravitino lifetime. Comparing two-body
gravitino and neutralino decays we find a lower bound on a neutralino NLSP
decay length, c \tau_{\chi^0_1} \gsim 30 cm. Together with gravitino and
neutralino masses one obtains a microscopic determination of the Planck mass.
For a stau-NLSP there exists no model-independent lower bound on the decay
length. Here the strongest bound comes from the requirement that the
cosmological baryon asymmetry is not washed out, which yields c
\tau_{\tilde\tau_1} \gsim 4 mm. However, without fine-tuning of parameters,
one finds much larger decay lengths. For typical masses,
and , the discovery of a photon line with an intensity
close to the Fermi-LAT limit would imply a decay length of
several hundred meters, which can be measured at the LHC.Comment: 30 pages, 8 figures; v2: published version, reference adde
Clinical usefulness of lipid ratios, visceral adiposity indicators, and the triglycerides and glucose index as risk markers of insulin resistance
Hidden in the woods? Meaning, determining, and practicing of ‘common welfare’ in the case of the German public forests
Postprandial Hypertriglyceridemia and Cardiovascular Disease: Current and Future Therapies
Obesity–Hypertension: Leptin as the Common Link to Cardiovascular and Renal Dysregulation
Data from: Life in the fat lane: seasonal regulation of insulin sensitivity, food intake, and adipose biology in brown bears
Grizzly bears (Ursus arctos horribilis) have evolved remarkable metabolic adaptations including enormous fat accumulation during the active season followed by fasting during hibernation. However, these fluctuations in body mass do not cause the same harmful effects associated with obesity in humans. To better understand these seasonal transitions, we performed insulin and glucose tolerance tests in captive grizzly bears, characterized the annual profiles of circulating adipokines, and tested the anorectic effects of centrally administered leptin at different times of the year. We also used bear gluteal adipocyte cultures to test insulin and beta-adrenergic sensitivity in vitro. Bears were insulin resistant during hibernation but were sensitive during the spring and fall active periods. Hibernating bears remained euglycemic, possibly due to hyperinsulinemia and hyperglucagonemia. Adipokine concentrations were relatively low throughout the active season but peaked in mid-October prior to hibernation when fat content was greatest. Serum glycerol was highest during hibernation, indicating ongoing lipolysis. Centrally administered leptin reduced food intake in October, but not in August, revealing seasonal variation in the brain’s sensitivity to its anorectic effects. This was supported by strong phosphorylated signal transducer and activator of transcription 3 labeling within the hypothalamus of hibernating bears; labeling virtually disappeared in active bears. Adipocytes collected during hibernation were insulin resistant when cultured with hibernation serum but became sensitive when cultured with active season serum. Heat treatment of active serum blocked much of this action. Clarifying the cellular mechanisms responsible for the physiology of hibernating bears may inform new treatments for metabolic disorders