The metabolism of pyruvic acid in the light and dark by Scenedesmus has been examined with two aims: to study the relationship of its metabolism to that of the intermediates of C1402 fixation and to compare its metabolic fate with that of hydroxypyruvate. The metabolism of hydroxypyruvic acid was compared with that of C1402 fixation in order to ascertain whether it might be a photosynthetic int...

Se evaluaron los biomarcadores en la fracción de hidrocarburos saturados (n-alcanos, pristano, fitano, terpanos y esteranos) un ensayo biorremediación 90 días con crudo extrapesado (10 ºAPI). Con base presencia una muestra compleja no resuelta (MCNR), deficiencia n-alcanos, fitano hopanos desmetilados (25-norhopanos), se determinó que el original está biodegradado. La detección pristano (más se...

In tensile tests, ?-Mg/C14–Mg2Ca eutectic alloy with a lamellar structure is plastically deformed above 473 K but ruptures before yielding at temperatures below 423 K. This study investigates the effect of ?/C14 interface on creep strength under 40 MPa stress. The curves exhibited three stages: normal transient stage, minimum creep-rate and accelerating stage. rate was proportional to spacing, ...

In social insects, cuticular hydrocarbons are involved in species, kin, caste and nestmate recognition. Gas chromatography and mass spectrometry were used to compare the cuticular hydrocarbon composition of workers, males and queens of Melipona bicolor. The cuticular hydrocarbon composition of this species was found to consist mainly of C23, C25:1, C25, C27:1, C27, C29:1 and C29, which are alre...