Sister-chromatid exchanges in β-thalassaemic patients under conditions of in vivo and in vitro depletion of folic acid

In order to investigate the effect of folate depletion, lymphocyte sister-chromatid exchange (SCE) rates were compared among homozygous β-thalassaemic patients with low folic acid levels, heterozygous β-thalassaemic patients with normal folate levels and healthy persons with normal haemoglobin, in cultures with both normal and depleted folate conditions. Significantly higher SCE rates were found in homozygous patients in all assays, but the in vitro folate depletion did not induce an increase in SCE frequency in any group.

Mercado internacional y balance de pagos = Commodity trade and the balance of payments

Incluye Bibliografía

Latin America and the Caribbean in the World Economy 2010-2011: The region in the decade of the emerging economies

Incluye Bibliografía

Heavy-light mesons scattering from nucleons: Quark-gluon and meson exchanges

We investigate the scattering of heavy-light K and D mesons by nucleons at low energies. The short-distance part of the interaction is described by quark-gluon interchange and the longdistance part is described by a one-meson-exchange model that includes the contributions of vector (ρ, ω) and scalar (σ) mesons. The microscopic quark model incorporates a confining Coulomb potential extracted from lattice QCD simulations and a transverse hyperfine interaction consistent with a finite gluon propagator in the infrared. The derived effective meson-nucleon potential is used in a Lippmann-Schwinger equation to obtain s-wave phase shifts. Our final aim is to set up a theoretical framework that can be extended to finite temperatures and baryon densities. © 2010 American Institute of Physics.

Futures markets as a risk management tool for Latin American commodity exports: some pending issues

Includes bibliography

Development of commodity trade between Latin America and the United States

Includes bibliography

Problemas y políticas de productos básicos = Commodity problems and policies

Incluye Bibliografía

International primary commodity marketing and Latin America

Includes bibliography

Commodity exports and Latin American development

Includes bibliography

Bolivia's commodity price shock

Includes bibliography

The "China effect" on commodity prices and Latin American export earnings

Includes bibliography

Latin America: variability and persistence in commodity prices

Includes bibliography

Latin American commodity exports: the case of cotton fibre

Includes bibliography

Study on commodity trade: draft resolution approved by Committee I on 25 May 1957

Includes bibliography

Resolución 7: Arreglos Intergubernamentales sobre productos primarios = Resolution 7: Inter-governmental commodity agreements = Résolution 7: Accords intergouvernementaux sur les produits de base

El símbolo E/840/Rev.1 corresponde a la edición bilingüe inglés/francés publicada en 1953