Bound states and scattering lengths of three two-component particles with zero-range interactions under one-dimensional confinement

The universal three-body dynamics in ultra-cold binary gases confined to one-dimensional motion are studied. The three-body binding energies and the (2 + 1)-scattering lengths are calculated for two identical particles of mass $m$ and a different one of mass $m_1$, which interactions is described in the low-energy limit by zero-range potentials. The critical values of the mass ratio $m/m_1$, at which the three-body states arise and the (2 + 1)-scattering length equals zero, are determined both for zero and infinite interaction strength $\lambda_1$ of the identical particles. A number of exact results are enlisted and asymptotic dependences both for $m/m_1 \to \infty$ and $\lambda_1 \to -\infty$ are derived. Combining the numerical and analytical results, a schematic diagram showing the number of the three-body bound states and the sign of the (2 + 1)-scattering length in the plane of the mass ratio and interaction-strength ratio is deduced. The results provide a description of the homogeneous and mixed phases of atoms and molecules in dilute binary quantum gases

Exact ground states for the four-electron problem in a Hubbard ladder

The exact ground state of four electrons in an arbitrary large two leg Hubbard ladder is deduced from nine analytic and explicit linear equations. The used procedure is described, and the properties of the ground state are analyzed. The method is based on the construction in r-space of the different type of orthogonal basis wave vectors which span the subspace of the Hilbert space containing the ground state. In order to do this, we start from the possible microconfigurations of the four particles within the system. These microconfigurations are then rotated, translated and spin-reversed in order to build up the basis vectors of the problem. A closed system of nine analytic linear equations is obtained whose secular equation, by its minimum energy solution, provides the ground state energy and the ground state wave function of the model.Comment: 10 pages, 7 figure

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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Resistance patterns of Mycobacterium tuberculosis isolated in Mexico's West

Background: The problem of multidrug resistant M, tuberculosis (MDR TB) has increased in recent years around the world. Objetive: To analyse the evolution of resistance patteras of M. tuberculosis. Methods: Cultures of M. tuberculosis isolated from patients of two terciary care hospitals of Guadalajara, México were analyzed. Susceptibility tests were earned out by the Canetti method. Results: The annual resistance percents of 262 cultures was: 1993 1994 1995 1996 Total (a=23) (a=26) (n=64) (n=149) (=262) Isomazid 74 77 53 78 71 Rifampin 43 42 41 40 41 Pyrazinamide 22 58 67 52 54 Ethambutol 65 62 47 77 53 Streptomycin 22 46 75 56 57 Ethionamide 22 27 50 49 45 Para-aminosalicyhc-acid(PAS) 30 46 41 45 43 Ciprofloxadn - 12 30 17 20 Ofloxacin - 15 30 39 34 MDR TB (isoniazid and rifampin) 43 27 31 36 31 Conclusions: The primary drugs resistance is high, the resistance to pyrazinamide, streptomycin, ethionamide and PAS has been increasing

Resistance patterns of Mycobacterium tuberculosis isolated in Mexico's West

Background: The problem of multidrug resistant M, tuberculosis (MDR TB) has increased in recent years around the world. Objetive: To analyse the evolution of resistance patteras of M. tuberculosis. Methods: Cultures of M. tuberculosis isolated from patients of two terciary care hospitals of Guadalajara, México were analyzed. Susceptibility tests were earned out by the Canetti method. Results: The annual resistance percents of 262 cultures was: 1993 1994 1995 1996 Total (a=23) (a=26) (n=64) (n=149) (=262) Isomazid 74 77 53 78 71 Rifampin 43 42 41 40 41 Pyrazinamide 22 58 67 52 54 Ethambutol 65 62 47 77 53 Streptomycin 22 46 75 56 57 Ethionamide 22 27 50 49 45 Para-aminosalicyhc-acid(PAS) 30 46 41 45 43 Ciprofloxadn - 12 30 17 20 Ofloxacin - 15 30 39 34 MDR TB (isoniazid and rifampin) 43 27 31 36 31 Conclusions: The primary drugs resistance is high, the resistance to pyrazinamide, streptomycin, ethionamide and PAS has been increasing