425 research outputs found
Pharmaconutrition in the clinical management of COVID-19: a lack of evidence-based research but clues to personalized prescription
A scientific interest has emerged to identify pharmaceutical and nutritional strategies in the
clinical management of coronavirus disease 2019 (COVID-19). The purpose of this narrative review is to critically assess and discuss pharmaconutrition strategies that, secondary to accepted treatment methods, could be candidates in the current context of COVID-19. Oral medicinal doses of vitamin C (1–3 g/d) and zinc (80 mg/d elemental zinc) could be promising at the first signs and symptoms of COVID-19 as well as for general colds. In critical care situations requiring parenteral nutrition, vitamin C (3–10 g/d) and glutamine (0.3–0.5 g/kg/d) administration could be considered, whereas vitamin D3 administration (100,000 IU administered intramuscularly as a one-time dose) could possess benefits for patients with severe deficiency. Considering the presence of n-3 polyunsaturated fatty acids and arginine in immune-enhancing diets, their co-administration may also occur in clinical conditions where these formulations are recommended. However, despite the use of the aforementioned strategies in prior contexts, there is currently no evidence of the utility of any nutritional strategies in the management of SARS-CoV-2 infection and COVID-19. Nevertheless, ongoing and future clinical research is imperative to determine if any pharmaconutrition strategies can halt the progression
of COVID-19
Superfield covariant analysis of the divergence structure of noncommutative supersymmetric QED
Commutative supersymmetric Yang-Mills is known to be renormalizable for
, while finite for . However, in the
noncommutative version of the model (NCSQED) the UV/IR mechanism gives rise
to infrared divergences which may spoil the perturbative expansion. In this
work we pursue the study of the consistency of NCSQED by working
systematically within the covariant superfield formulation. In the Landau
gauge, it has already been shown for that the gauge field
two-point function is free of harmful UV/IR infrared singularities, in the
one-loop approximation. Here we show that this result holds without
restrictions on the number of allowed supersymmetries and for any arbitrary
covariant gauge. We also investigate the divergence structure of the gauge
field three-point function in the one-loop approximation. It is first proved
that the cancellation of the leading UV/IR infrared divergences is a gauge
invariant statement. Surprisingly, we have also found that there exist
subleading harmful UV/IR infrared singularities whose cancellation only takes
place in a particular covariant gauge. Thus, we conclude that these last
mentioned singularities are in the gauge sector and, therefore, do not
jeopardize the perturbative expansion and/or the renormalization of the theory.Comment: 36 pages, 11 figures. Minor correction
On the consistency of the three-dimensional noncommutative supersymmetric Yang-Mills theory
We study the one-loop quantum corrections to the U(N) noncommutative
supersymmetric Yang-Mills theory in three spacetime dimensions (NCSYM). We
show that the cancellation of the dangerous UV/IR infrared divergences only
takes place in the fundamental representation of the gauge group. Furthermore,
in the one-loop approximation, the would be subleading UV and UV/IR infrared
divergences are shown to vanish.Comment: 8 pages and 2 figure
The Three-Dimensional Noncommutative Nonlinear Sigma Model in Superspace
We study the superspace formulation of the noncommutative nonlinear
supersymmetric O(N) invariant sigma-model in 2+1 dimensions. We prove that the
model is renormalizable to all orders of 1/N and explicitly verify that the
model is asymptotically free.Comment: 16 pages, 5 figures, Revte
A Consistent Noncommutative Field Theory: the Wess-Zumino Model
We show that the noncommutative Wess-Zumino model is renormalizable to all
orders of perturbation theory. The noncommutative scalar potential by itself is
non-renormalizable but the Yukawa terms demanded by supersymmetry improve the
situation turning the theory into a renormalizable one. As in the commutative
case, there are neither quadratic nor linear divergences. Hence, the IR/UV
mixing does not give rise to quadratic infrared poles.Comment: 22 pages, 7 figures. Added references. Typos correcte
Comunidade de artrĂłpodes associada Ă copa de Attalea phalerata Mart. (Arecaceae) durante o perĂodo de cheia no Pantanal de PoconĂ©, MT
Incorporation Of Oxygen In Crystalline Zeolitic Chromosilicates: Optical Identification Of Chromium(vi) By Photoacoustic Spectroscopy
Incorporation of oxygen to crystalline zeolitic chromosilicates, with oxidation of anchored CrIII to non-interacting CrVI species, has been confirmed by photoacoustic spectroscopy; the dichromate anion being extracted from the chromosilicate with water and identified by precipitation of AgCrO4 and oxidation to CrO5.1492292
On spin-1 massive particles coupled to a Chern-Simons field
We study spin one particles interacting through a Chern-Simons field. In the
Born approximation, we calculate the two body scattering amplitude considering
three possible ways to introduce the interaction: (a) a Proca like model
minimally coupled to a Chern-Simons field, (b) the model obtained from (a) by
replacing the Proca's mass by a Chern-Simons term and (c) a complex
Maxwell-Chern-Simons model minimally coupled to a Chern-Simons field. In the
low energy regime the results show similarities with the Aharonov-Bohm
scattering for spin 1/2 particles. We discuss the one loop renormalization
program for the Proca's model. In spite of the bad ultraviolet behavior of the
matter field propagator, we show that, up to one loop the model is power
counting renormalizable thanks to the Ward identities satisfied by the
interaction vertices.Comment: 14 pages, 5 figures, revte
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