Largest eigenvalue distribution in the double scaling limit of matrix models: A Coulomb fluid approach

Using thermodynamic arguments we find that the probability that there are no eigenvalues in the interval (-s,\infty) in the double scaling limit of Hermitean matrix models is O(exp(-s^{2m+1})) as s\to+\infty.Here m=1,2,3.. determine the m^{th} multi-critical point of the level density:\sigma(x)\sim b[1-(x/b)^2]^{m-1/2} and b^2\sim N.Furthermore,the size of the transition zone where the eigenvalue density becomes vanishingly small at the tail of the spectrum is \sim N^{(m-3/2)/(2m+1)} in agreement with earlier work based on the string equation.Comment: 10 pages, no figures, to appear in J.Phys. A Lett. 199

Species and Chlorine Fertilisation Affect Dietary Cation-Anion Difference of Cool-Season Grasses

The Dietary Cation-Anion Difference [DCAD = (Na + K) - (Cl + S); Ender et al., 1971] is used in balancing rations for dry dairy cows. Low DCAD diets induce a mild, compensated metabolic acidosis that stimulates bone resorption, improves Ca homeostasis, and prevents milk fever. Dry cow rations contain a high proportion of forage and, therefore, forages fed two to four weeks prepartum should have a low or negative DCAD value. Our objectives were to evaluate the DCAD of five cool-season grass species grown in eastern Canada and to determine the effect of Cl fertilisation on the DCAD value of timothy (Phleum pratense L.)

Improving Forage Nonstructural Carbohydrates through Management and Breeding

Nonstructural carbohydrates (NSC) are an important source of readily fermentable energy available to rumen microbes. Limited concentrations of readily available energy in forages combined with fast and intensive protein degradation contribute to poor N use efficiency by dairy cows and other ruminants. Increasing NSC in forages has been shown to improve intake, milk yield, and N use efficiency (Brito et al. 2009). We assessed several strategies to increase forage NSC accumulation, including PM-cutting, species selection and genetic improvement

Antioxidant therapies in COPD

Oxidative stress is an important feature in the pathogenesis of COPD. Targeting oxidative stress with antioxidants or boosting the endogenous levels of antioxidants is likely to be beneficial in the treatment of COPD. Antioxidant agents such as thiol molecules (glutathione and mucolytic drugs, such as N-acetyl-L-cysteine and N-acystelyn), dietary polyphenols (curcumin, resveratrol, green tea, catechins/quercetin), erdosteine, and carbocysteine lysine salt, all have been reported to control nuclear factor-kappaB (NF-κ B) activation, regulation of glutathione biosynthesis genes, chromatin remodeling, and hence inflammatory gene expression. Specific spin traps such as α-phenyl-N-tert-butyl nitrone, a catalytic antioxidant (ECSOD mimetic), porphyrins (AEOL 10150 and AEOL 10113), and a superoxide dismutase mimetic M40419 have also been reported to inhibit cigarette smoke-induced inflammatory responses in vivo. Since a variety of oxidants, free radicals, and aldehydes are implicated in the pathogenesis of COPD, it is possible that therapeutic administration of multiple antioxidants will be effective in the treatment of COPD. Various approaches to enhance lung antioxidant capacity and clinical trials of antioxidant compounds in COPD are discussed

Laser induced fluorescence in Nd3+ : LaCl3. I. — Hyperfine structures

The laser induced fluorescence line-narrowing technique has been used to obtain high-resolution spectra of isotopically enriched 143Nd 3+ and 145Nd3+ ions in a LaCl3 host. Nuclear magnetic dipole interactions have been investigated for the 4I9/2 ↔ 2H11/2 and 4I 9/2 ↔ 4G5/2 transitions in two-level and three-level systems.La technique d'affinement des raies de fluorescence induite par laser a été utilisée pour l'obtention de spectres à haute résolution sur les isotopes enrichis 143 et 145 de l'ion Nd3+ dans une matrice de LaCl 3. Les interactions nucléaires dipolaires magnétiques ont été étudiées sur les transitions 4I9/2 ↔ 2H 11/2 et 4I9/2 ↔ 4G5/2 dans des systèmes à deux et à trois niveaux

Investigation of the Active Ions Distribution in Laser Crystals Using High Resolution Spectroscopy

High resolution spectroscopy techniques are used to investigate the distribution of rare-earth ions inside crystal hosts and their transfer properties. Examples concerning two typical laser materials are treated

Laser induced fluorescence in Nd3+ : LaCl3 II. — Energy transfer phenomena

Techniques involving a single mode CW tunable laser have been applied to isotopically enriched Nd3+ ions in a LaCl3 host. Some problems related to energy migration have been investigated : satellite structure, energy up-conversion, and spectral diffusion among ions in dissimilar sites.Des techniques utilisant un laser monomode continu et accordable ont été appliquées à l'étude d'ions Nd3+ isotopiquement enrichis dans une matrice de LaCl3. Des problèmes liés à l'existence de transfert d'énergie ont été étudiés : raies satellites, up-conversion, diffusion spectrale entre ions dans des sites différents