146 research outputs found
Alice in Wonderland
Illustration of Alice sitting in chair and mad hatter fussing at rabbithttps://scholarsjunction.msstate.edu/cht-sheet-music/6620/thumbnail.jp
Alice in Wonderland
Illustration of Alice, the Mad Hatter, and rabbit; inset photo of Eddie Cantorhttps://scholarsjunction.msstate.edu/cht-sheet-music/8669/thumbnail.jp
Estimation of Dietary Iron Bioavailability from Food Iron Intake and Iron Status
Currently there are no satisfactory methods for estimating dietary iron absorption (bioavailability) at a population level, but this is essential for deriving dietary reference values using the factorial approach. The aim of this work was to develop a novel approach for estimating dietary iron absorption using a population sample from a sub-section of the UK National Diet and Nutrition Survey (NDNS). Data were analyzed in 873 subjects from the 2000â2001 adult cohort of the NDNS, for whom both dietary intake data and hematological measures (hemoglobin and serum ferritin (SF) concentrations) were available. There were 495 men aged 19â64 y (mean age 42.7±12.1 y) and 378 pre-menopausal women (mean age 35.7±8.2 y). Individual dietary iron requirements were estimated using the Institute of Medicine calculations. A full probability approach was then applied to estimate the prevalence of dietary intakes that were insufficient to meet the needs of the men and women separately, based on their estimated daily iron intake and a series of absorption values ranging from 1â40%. The prevalence of SF concentrations below selected cut-off values (indicating that absorption was not high enough to maintain iron stores) was derived from individual SF concentrations. An estimate of dietary iron absorption required to maintain specified SF values was then calculated by matching the observed prevalence of insufficiency with the prevalence predicted for the series of absorption estimates. Mean daily dietary iron intakes were 13.5 mg for men and 9.8 mg for women. Mean calculated dietary absorption was 8% in men (50th percentile for SF 85 ”g/L) and 17% in women (50th percentile for SF 38 ”g/L). At a ferritin level of 45 ”g/L estimated absorption was similar in men (14%) and women (13%). This new method can be used to calculate dietary iron absorption at a population level using data describing total iron intake and SF concentration
Non-renormalization theorems in softly broken SQED and the soft -functions
The renormalization of softly broken SQED is related to the one of
supersymmetric QED by using the construction with a local gauge supercoupling
and by taking into account softly broken anomalous axial U(1) symmetry. From
this extended model one obtains the non-renormalization theorems of SQED and
the counterterms of the soft breaking parameters as functions of the
supersymmetric counterterms. Due to the Adler-Bardeen anomaly of the axial
current an invariant regularization scheme does not exist, and therefore the
-functions of soft breaking parameters are derived from an algebraic
construction of the Callan-Symanzik equation and of the renormalization group
equation. We obtain the soft -functions in terms of the gauge
-function and of the anomalous dimension of the supersymmetric matter
mass. In particular, we find that the X-term of the scalar mass
-function as well as the gauge -function in are due to
the Adler-Bardeen anomaly of the axial symmetry.Comment: 28 page
Some Remarks On Gauge-Mediated Supersymmetry Breaking
We investigate the communication of supersymmetry breaking to the Standard
Model in theories of gauge mediated supersymmetry breaking with general weakly
coupled messenger sectors. We calculate the one loop gaugino and two loop soft
scalar masses for nonvanishing Str M^2 of the messenger sector. The soft scalar
masses are sensitive to physics at scales higher than the messenger scale, in
contrast to models with vanishing messenger supertrace. We discuss the
implications of this ultraviolet sensitivity in theories with renormalizable
and nonrenormalizable supersymmetry breaking sectors. We note that the standard
relation, in minimal gauge mediation, between soft scalar and gaugino masses is
altered in models with nonvanishing messenger supertrace.Comment: 14 pages, LaTeX, uses epsf, 4 .eps figures included; minor
corrections,version to appear in Phys.Lett.
Exact beta-functions in softly-broken N=2 Chern-Simons matter theories
We present exact results for the beta-functions for the soft-breaking
parameters in softly-broken N=2 Chern-Simons matter theories in terms of the
anomalous dimension in the unbroken theory. We check our results explicitly up
to the two loop level.Comment: 11 pages; 3 figures; references adde
Loss of CD4+ TÂ cell-intrinsic arginase 1 accelerates Th1 response kinetics and reduces lung pathology during influenza infection
Arginase 1 (Arg1), the enzyme catalyzing the conversion of arginine to ornithine, is a hallmark of IL-10-producing immunoregulatory M2 macrophages. However, its expression in T cells is disputed. Here, we demonstrate that induction of Arg1 expression is a key feature of lung CD4+ T cells during mouse in vivo influenza infection. Conditional ablation of Arg1 in CD4+ T cells accelerated both virus-specific T helper 1 (Th1) effector responses and its resolution, resulting in efficient viral clearance and reduced lung pathology. Using unbiased transcriptomics and metabolomics, we found that Arg1-deficiency was distinct from Arg2-deficiency and caused altered glutamine metabolism. Rebalancing this perturbed glutamine flux normalized the cellular Th1 response. CD4+ T cells from rare ARG1-deficient patients or CRISPR-Cas9-mediated ARG1-deletion in healthy donor cells phenocopied the murine cellular phenotype. Collectively, CD4+ T cell-intrinsic Arg1 functions as an unexpected rheostat regulating the kinetics of the mammalian Th1 lifecycle with implications for Th1-associated tissue pathologies
Effect of angiotensin-converting enzyme inhibitor and angiotensin receptor blocker initiation on organ support-free days in patients hospitalized with COVID-19
IMPORTANCE Overactivation of the renin-angiotensin system (RAS) may contribute to poor clinical outcomes in patients with COVID-19.
Objective To determine whether angiotensin-converting enzyme (ACE) inhibitor or angiotensin receptor blocker (ARB) initiation improves outcomes in patients hospitalized for COVID-19.
DESIGN, SETTING, AND PARTICIPANTS In an ongoing, adaptive platform randomized clinical trial, 721 critically ill and 58 nonâcritically ill hospitalized adults were randomized to receive an RAS inhibitor or control between March 16, 2021, and February 25, 2022, at 69 sites in 7 countries (final follow-up on June 1, 2022).
INTERVENTIONS Patients were randomized to receive open-label initiation of an ACE inhibitor (nâ=â257), ARB (nâ=â248), ARB in combination with DMX-200 (a chemokine receptor-2 inhibitor; nâ=â10), or no RAS inhibitor (control; nâ=â264) for up to 10 days.
MAIN OUTCOMES AND MEASURES The primary outcome was organ supportâfree days, a composite of hospital survival and days alive without cardiovascular or respiratory organ support through 21 days. The primary analysis was a bayesian cumulative logistic model. Odds ratios (ORs) greater than 1 represent improved outcomes.
RESULTS On February 25, 2022, enrollment was discontinued due to safety concerns. Among 679 critically ill patients with available primary outcome data, the median age was 56 years and 239 participants (35.2%) were women. Median (IQR) organ supportâfree days among critically ill patients was 10 (â1 to 16) in the ACE inhibitor group (nâ=â231), 8 (â1 to 17) in the ARB group (nâ=â217), and 12 (0 to 17) in the control group (nâ=â231) (median adjusted odds ratios of 0.77 [95% bayesian credible interval, 0.58-1.06] for improvement for ACE inhibitor and 0.76 [95% credible interval, 0.56-1.05] for ARB compared with control). The posterior probabilities that ACE inhibitors and ARBs worsened organ supportâfree days compared with control were 94.9% and 95.4%, respectively. Hospital survival occurred in 166 of 231 critically ill participants (71.9%) in the ACE inhibitor group, 152 of 217 (70.0%) in the ARB group, and 182 of 231 (78.8%) in the control group (posterior probabilities that ACE inhibitor and ARB worsened hospital survival compared with control were 95.3% and 98.1%, respectively).
CONCLUSIONS AND RELEVANCE In this trial, among critically ill adults with COVID-19, initiation of an ACE inhibitor or ARB did not improve, and likely worsened, clinical outcomes.
TRIAL REGISTRATION ClinicalTrials.gov Identifier: NCT0273570
Pretty Polly Perkins: Fox-Trot Song
https://digitalcommons.library.umaine.edu/mmb-vp-copyright/6961/thumbnail.jp
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