A study of pulsation & rotation in a sample of A-K type stars in the field.

Unlabelled: We present the results of time-series photometric analysis of 15106 A-K type stars observed by the space mission. We identified 513 new rotational variables and measured their starspot rotation periods as a function of spectral type and discuss the distribution of their amplitudes. We examined the well-established period-color relationship that applies to stars of spectral types F5-K for all of these rotational variables and, interestingly, found that a similar period-color relationship appears to extend to stars of spectral types A7 to early-F too.

Butanolides from methanolic extract of Litsea glutinosa.

Phytochemical investigations of a MeOH extract obtained from the heartwoods of the Litsea glutinosa (Lauraceae) led to the isolation and characterization of four new butenolides, (3R,4S,5S)-2-hexadecyl-3-hydroxy-4-methylbutanolide 1, litsealactone C (2), and litsealactone D (4), litsealactone G (5), and a new benzoic acid derivative named eusmoside C (3). The structures of these compounds were elucidated on the basis of spectral studies.

Flavonoids: A versatile source of anticancer drugs.

An exponential increase in the number of studies investigating how different components of the diet interact at the molecular and cellular level to determine the fate of a cell has been witnessed. In search for anticancer drugs compelling data from laboratories, epidemiologic investigations, and human clinical trials showed that flavonoids have important effects on cancer chemoprevention and chemotherapy. In many molecular mechanisms of action for prevention against cancer, flavonoids play a major role by interacting between different types of genes and enzymes.

Structural modifications of plumieride isolated from Plumeria bicolor and the effect of these modifications on in vitro anticancer activity.

Plumieride was isolated as one of the major components from the biologically active methanolic extract of the bark of Plumeria bicolor (family Apocynaceae). For investigating the effect of substituents on cytotoxic activity it was modified into a series of compounds. Replacing the methyl ester functionality of plumieride with alkyl amides of variable carbon units improved the cytotoxic activity, and a correlation between overall lipophilicity and cytotoxic activity was observed.