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Abstract: We investigated the luminescence properties of (Ca1−x Zn x )Ga2S4:Eu2+ phosphor as a function of Zn2+ and Eu2+ concentrations. The luminescence intensity was markedly enhanced by increasing the mole fraction of Zn2+ at Ca2+ sites. Lacking any Zn2+ ions, CaGa2S4:0.01Eu2+ converted only 18.1% of the absorbed blue light into luminescence. As the Zn2+ concentration increased, the quantum yield increased and reached a maximum of 24.4% at x =0.1. Furthermore, to fabricate the device, the optimized green-yellow (Ca0.9Zn0.1)Ga2S4:Eu2+ phosphor was coated with MgO. White light was generated by combining the MgO-coated phosphor and the blue emission from a GaN chip. [Copyright &y& Elsevier]

Background: Recurrent spontaneous abortion (RSA) is defined as the occurrence of three or more consecutive spontaneous abortion before 20 gestational weeks. But, 40-50% of RSA still remain "unex-plained". Cytokines seem to play a critical role in the pathogenesis of unexplained RSA, and Th1 cytokines have been shown to exert deleterious effects on pregnancy. NK cytotoxicity has been reported to be predictive of subsequent abortion in women who had unexplained recurrent abortions. The aim of this study was to investigate immunophenotypic characteristics of peripheral blood mononu-clear cells and evaluate Th1 cytokine (TNF-alpha) production in women with RSA., Methods: The study group comprised 93 women with RSA, and the control group consisted of 40 healthy pregnant women. The population of CD56/CD16 cells was observed by using a two-color scattergram in FACScan (Becton Dickinson, San Jose CA, USA). Concentration of TNF-alpha was measured by an enzyme-linked immunoabsorbant assay (ELISA) using commercial kits (NEOGEN corporation, Lexington KY, USA)., Results: The percentage of CD56+/CD16-cells were significantly higher (P<0.05) in the patients with RSA (13.40+/-7.95%) than in the pregnant control group (9.12+/-3.93%). We observed a significantly higher level of TNF-alpha (medians: 85.59+/-8.29 pg/mL versus 44.80+/-9.78 pg/mL; P<0.05) in RSA women compared to controls., Conclusions: This study indicates that an increased proportion of CD56+/CD16-mononuclear cells and increased level of serum TNF-alpha are related to RSA. Thus, the two factors could be used as an indicator of subsequent successful implantation and maintenance of gestation.

Background: Plasma cholesteryl ester transfer protein (CETP) functions to transfer cholesteryl ester from HDL to triglyceride-rich lipoproteins and regulates plasma HDL cholesterol level. A common mutation, the exon 15 A to G substitution at codon 442 (D442G) results in reduced plasma CETP activity and increased plasma HDL cholesterol level. Meanwhile, hormone replacement therapy (HRT) in postmenopausal women increases plasma HDL cholesterol level., Methods: We investigated the frequency of D442G mutation and its effect on plasma HDL cholesterol level in Korean women. We also examined if the mutation has any effect on an increase in plasma HDL cholesterol level during HRT., Results: Two hundred and twenty eight women aged over 40 years were recruited in this study. Of 228 women, 22 (9.6%) were identified as having the D442G mutation; 21 heterozygotes and 1 homozygote. The subjects with the mutation had higher plasma HDL cholesterol levels than those without the mutation (61.6 +/- 17.3 vs. 55.1 +/- 14.0 mg/dL, p < 0.05). After 12 month HRT, HDL cholesterol increased by 6.4% (3.6 +/- 13.2 mg/dL, p < 0.05) and D442G mutation did not have any significant effect on the change of plasma HDL cholesterol level., Conclusion: D442G mutation is common in Korean postmenopausal women and it is associated with increased plasma HDL cholesterol level. HRT for postmenopausal women increased plasma HDL cholesterol level in similar amounts regardless of the presence or absence of D442G mutation.