The aim of this study was to investigate the hypoglycemic effects of saengshik in Sprague-Dawley (SD) rats and to explore the potential of three commercially available saengshik products (BS, LS, WS) as an alternative diabetic meal. Blood glucose levels were measured at 30, 60, 90, 120, and 150 minutes after the ingestion of experimental materials. In experiment 1, the amount of experimental materials remained the same. We measured blood glucose-related biomarkers as the area under the blood glucose response curve (AUC), glycemic index (GI), maximum concentration (Cmax), and time to reach maximum concentration (Tmax). AUC and Cmax of the experimental group showed significant differences compared to the control group, while GI and Tmax did not show significant differences among the groups but were lower in the experimental group compared to the control group. In experiment 2, carbohydrates were adjusted to the same amount. We measured blood glucose-related biomarkers in the same manner as Experiment 1 and obtained similar results. These hypoglycemic effects appear to be attributed to phytochemicals and dietary fiber found in whole, unrefined grains. These results suggest that saengshik exerts hypoglycemic effects by modulation of glucose-related biomarkers.

As a part of the short-period variability survey (SPVS) at Bohyunsan Optical Astronomy Observa- tory, we obtained time-series BV CCD images in the region of the open cluster NGC 1039 (M34). The observations were performed for 22 nights from July 29, 2008 to September 26, 2010. We also made LOAO observations for 10 days from September 18, 2009 to October 30, 2010 to confirm the small variabilties of δ Scuti-type variable stars. In this paper we presented the observational properties of 28 variable stars found in the region. They are seven δ Scuti-type variable stars, two Doradus-type variable stars, four- teen eclipsing binary stars and five semi-long periodic or slow irregular variables, respectively. Only three variables were listed in the GCVS and the rest are newly discovered ones. We have performed multiple- frequency analysis to determine pulsation frequencies of the δ Scuti-type and ɤ Doradus-type variable stars, using the discrete Fourier transform and linear least-square fitting methods. We also have derived the periods and amplitudes of 12 eclipsing binaries from the phase fitting method, and presented the light curves of all variable stars.

This is the second paper on a systematic search for variable stars in Cyg OB3 region. In this paper we present the observational properties of 46 variable stars found in the region. Among them, 27 are eclipsing binaries and others are semi-long periodic or slow irregular variables. Only 5 are known variables and the rest are newly discovered ones. We have obtained the period and amplitude of 20 eclipsing binaries using the phase fitting method, and present the light curves of 46 variable stars.

As a part of the short-period variability survey (SPVS) at Bohyunsan Optical Astronomy Observatory, we obtained time-series BV CCD images in the region of Cyg OB3 association centered on the open cluster NGC 6871. The observations were performed for 18 nights from September 5, 2008 to September 1, 2009. We found 15 short-period variable stars in the region. They are δ Scuti type stars belonging to the local spiral arm, Orion spur. Among them, only two stars were previously known, and the rest are newly discovered ones. In this paper, we have performed a multiple-frequency analysis to determine frequencies of the 15 δ Scuti type stars, using the discrete Fourier transform and linear least-square fitting methods. One of the newly discovered variable stars is a double-mode δ Scuti type star with the fundamental and the first overtone modes, and two are high amplitude δ Scuti stars.

Guava (Psidium guajava) contain a great deal of polyphenol compound and work on the treatment of Diabetes mellitus effectively. In this study, the bioactivities of aqueous extract (GLEx) of guava leaf were investigated. Total phenolic contents of GLEx was 266.9 mg tan/g. The effects of GLEx on digestive enzymes, α-amylase, maltase and sucrase were investigated. IC50 values of GLEx against α-amylase, maltase and sucrase were 0.65 mg/ml, 2.0 mg/ml and 3.5 mg/ml respectively. The effect of GLEx on oral glucose tolerance test (OGTT) was performed in normal ICR mouse, control (dstilled water) and GLEx (aqueous extract of Guava leaf) were co-administered orally with glucose, showed reducing effect on the blood glucose level. The guava is likely to useful for prevention or improvement of hyperglycemia by lowering the blood glucose level and inhibiting glycoside hydrolase activity.