For lasers for which the dipole approximation applies, a nonperturbative approach based upon the Kramers-Henneberger translation transformation, followed by Floquet series expansions, yields, for sufficiently high frequencies, the so-called “”laser-dressed”" potential, which

is taken for composing a time-independent Schrodinger equation whose solutions are the desired quasistationary states. This approach, developed originally for atoms, has been verified to be useful also for carriers in semiconductor nanostructures under learn more intense laser fields. In quantum wells, analytical expressions for the dressed potential have been proposed in literature for a nonresonant, intense laser field polarized perpendicularly to the interfaces.

By noting that they apply only for alpha(0) <= L/2, where alpha(0) is the laser-dressing parameter and L is the well width, we derive here an analytical expression valid for all values of alpha(0). Interestingly, our model predicts the formation of a double-well potential for laser frequencies and intensities such that alpha(0) <= L/2, which creates a possibility of generating resonant states into the channel. In addition, the rapid coalescence of the energy levels with the increase in alpha(0) we found indicates find more the possibility of controlling the population inversion in quantum well lasers operating in the optical pumping scheme. (C) 2009 American Transmembrane Transporters inhibitor Institute of Physics. [DOI: 10.1063/1.3153963]“
“Lipoprotein lipase (LPL) is a key enzyme in lipid metabolism and is associated with obesity, dyslipidemias, hypertension (HTN) and type 2 diabetes

mellitus (T2DM). LPL gene polymorphisms can be related with the development of cardiovascular risk factors. The present study was conducted to analyze the relationship of the HindIII and S447X polymorphisms in LPL gene with cardiovascular risk factors in Mexican families. The study population comprised ninety members of 30 Mexican families, in which an index case had obesity, were included in the study. We evaluated the body composition by bioelectrical impedance. Peripheral blood samples were collected to determine biochemical parameters. Screening for both polymorphisms was made by PCR-RFLPs. In the parents, both polymorphisms were in Hardy-Weinberg’s equilibrium. We found that the genotype T/T of HindIII was associated with diastolic blood pressure >= 85 mmHg (OR = 1.1; p = 0.011), whereas the genotype C/C of S447X was associated with systolic blood pressure >= 130 mmHg (OR = 1.2; p < 0.001), diastolic blood pressure >= 85 mmHg (OR = 1.3; p < 0.001), T2DM (OR = 1.3; p < 0.001) and with increase of total cholesterol (beta = 23.6 mg/mL; p = 0.03).