Glucose Homeostasis during Fetal and Neonatal Period / 대한주산의학회잡지

Glucose is essential for energy metabolism in human, especially in brain, and is a source of energy storage in the form of glycogen, fat and protein. During fetal life, the predominant source of energy is also glucose, which crosses the placenta by facilitated diffusion. There is very little endogenous glucose production under normal circumstances during fetal life. During labor, the fetus is exposed to physiological challenges that require metabolic adaptation. A healthy infant successfully manages the postnatal transition by mobilizing and using alternative. After birth, there is a rapid surge in catecholamine and glucagon levels, and a steady decrease in insulin, as blood glucose levels decline. These hormonal changes induce enzyme activities that lead to glycogenolysis and gluconeogenesis. During the first 24-48 hours of life, plasma glucose concentrations of neonates are typically lower than later in life. Distinguishing between transitional neonatal glucose regulation in normal neonates and hypoglycemia that persists or occurs for the first time beyond the first 72 hours of life is important for prompt diagnosis and treatment to avoid serious consequences.

Stability study of azithromycin in ophthalmic preparations / Estudo de estabilidade de azitromicina em preparações oftálmicas

A stability study of azithromycin in ophthalmic preparations was developed by submission to different types of light, temperature and pH, using the biodiffusion assay (cylinder 3 x 3) for the quantifications. Bacillus subtilis, ATCC 9372, was used as test organism. The used concentration range was of 50 to 200 µg/mL. The study demonstrated that the drug suffered degradation when submitted to the ultraviolet light, germicide light, solar luminosity, acid solution, basic solution and hydrogen peroxide solution. The results were analyzed by the analysis of variance (ANOVA).

O estudo de estabilidade de azitromicina em preparações oftálmicas foi realizado após exposição a diferentes tipos de luz, temperatura e pH, utilizando o método de difusão em ágar (cilindros 3 x 3) para as quantificações. A faixa de concentração foi de 50 a 200 µg/mL. O estudo demonstrou que o fármaco sofreu degradação quando submetido às luzes ultravioleta, germicida e solar, e a soluções ácida, alcalina e de peróxido de hidrogênio. Os resultados foram analisados através da análise da variância (ANOVA).