Reactive oxygen species are known to be potentially dangerous, but are also needed for signal-transduction pathways. Tumor cells have relatively low amounts of superoxide dismutase (SOD), which quenches superoxide anion (O2 •), and as a result of a higher level of aerobic metabolism, higher concentrations of O2 •, compared to normal cells. But this may not be true of all tumor cells. Some tumor...

The effect of mechanical damage on the composition of the essential oil obtained from eugenol-rich Ocimum minimum leaves was determined over 48 hours. Changes in the levels of five oil-constituents were detected in the first post-wounding day but only one of those components (camphor) exhibited the same behaviour the day after. The levels of eugenol (-4.8%) and linalool (+2.5%) were affected th...

Problem 1[C&B] 5.39 b. Using the normal approximation, we have µ v = r(1 − p)/p = 20(.3)/.7 = 8.57 and σ v = ï¿¿ r(1 − p)/p 2 = ï¿¿ (20)(.3)/.49 = 3.5.

PHOSPHORUS IN ESCHERICHIA COLI 705 Schachman, H. K., Pardee, A. B. & Stanier, R. Y. (1,952). Arch. Biochem. Biophys. 38, 245. Schmidt, C. F. (1948). J. Bact. 55, 705. Schmidt, G. & Thannhauser, S. J. (1945). J. biol. Chem. 161, 83. Sherratt, H. S. A. & Thomas, A. J. (1953). J. gen. Microbiol. 8, 217. Smellie, R. M. S., Maclndoe, W. M., Logan, R. & Davidson, J. N. (1953). Biochem. J. 54, 280. Ty...

Die röntgenografisch gefundene Elektronendichte-Verteilung der Schichtstruktur der Chloroplastenlamellen weist darauf hin, daß die Porphyrinringe des Chlorophylls eine separate Schicht zwischen einer Proteinund einer polaren Lipidschicht bilden. Basierend auf diesem Ergebnis kann gezeigt werden, daß die Porphyrinringplatten der Chlorophylltypen, die bei 673, 683 und jenseits 705 nm absorbieren,...