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Collisional excitation X-ray laser experiments in plasmas produced by 0.53-μm and 0.35-μm laser light (1990)

Keane, C. J. ; MacGowan, B. J. ; Matthews, D. L. ; [et al.]

Springer

Applied physics 50 (1990), S. 257-264

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ISSN: 1432-0649

Keywords: 42.55.Hq ; 52.50.Jm

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Recent Ne- and Ni-like X-ray laser experiments carried out at the Centre d'Etudes de Limeil-Valenton (CEL-V) are reviewed. A variety of experiments in Ne-like X-ray lasers were performed; here we discuss measurements of soft X-ray amplification in Ge (Z=32) and Sr (Z=38) plasmas. In Ge plasmas produced by 0.53-μm laser light at an irradiance of 6.0×1013 W/cm2, gains between 2.2–2.5 cm−1 on the 232.2 and 236.2 Å J=2−1 lines and a gain of 1.0 cm−1 on the 196.1 Å J=0−1 line were measured. In addition, gains of 4.4 cm−1 and 4.0 cm−1 have been demonstrated on the J=2−1 transitions at 164.1 and 166.5 Å in Nelike Sr at laser intensities of 1.3×1014 W/cm2. The effects of pumping the Ne-like Se X-ray laser with 0.35-μm laser light have also been investigated; the Se lasing spectra is similar to that obtained with 0.53-μm light. Experiments have also been carried out to optimize the gain of the 50.3 Å Ni-like Yb (Z=70) J=0−1 line. For Yb, no significant increase in gain over that previously reported was seen, but the time history of the Ni-like Yb X-ray laser was measured for the first time. Finally, attempts to extrapolate the Ni-like results to shorter wavelength were made using Ta (Z=73), W (Z=74), and Re (Z=75). No definitive observation of the Ni-like J=0−1 lasing lines was made in these experiments.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00325057

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Enzymatic, metabolic and secretory perturbations in pancreatic islets of thyroidectomized rats (1993)

Sener, Abdullah ; Malaisse-Lagae, Francine ; Gervy-Decoster, Christine ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Cell Biochemistry and Function 11 (1993), S. 145-151

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ISSN: 0263-6484

Keywords: Hypothyroidism ; pancreatic islets ; FAD-glycerophosphate dehydrogenase ; insulin secretion ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: In thyroidectomized rats, the activity of FAD-linked glycerophosphate dehydrogenase was severely diminished in liver homogenates but not affected significantly in pancreatic islet homogenates, whilst the activity of 2-ketoglutarate dehydrogenase was decreased modestly in both liver and islet homogenates. Likewise, in intact islets of thyroidectomized rats, the generation of3HOH from [2-3H]glycerol was not decreased, and the ratio between oxidative and total glycolysis not significantly lower than in islets from sham-operated rats, at least in the presence of a high concentration of D-glucose. Nevertheless impaired oxidation of both D-[3,4-14C]glucose and D-[6-14C]glucose was observed in islets of thyroidectomized rats, the relative magnitude of such a decrease being more pronounced at a low than at a high D-glucose concentration. Such metabolic anomalies coincided with a lower level of plasma insulin and a decreased output of insulin by islets incubated at low (2·8 mM), but not higher, concentrations of D-glucose. It is concluded that hypothyroidism does not mimic the deficiency in islet FAD-linked glycerophosphate dehydrogenase activity found in rats with inherited or acquired non-insulin-dependent diabetes.

Additional Material: 2 Ill.