A. Peña

Publications103
h-index26
Citations1,983
Highly Influential Citations63
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Effects of P-Pinene on Yeast Membrane Functions
TLDR
In a screening study of several allelopathic agents on respiration patterns in yeast cells, it was found that one of the most potent of these agents was P-pinene, apparently localized in the membranes of microorganisms.
Effects of beta-pinene on yeast membrane functions
TLDR
The studies on isolated mitochondria showed a series of effects, starting with the disappearance of the respiratory control and deenergization of the organelles and followed by an inhibition of respiration at higher concentrations of the terpene, indicating the mitochondrial localization of the inhibition.
Potassium collapses the deltaP in yeast mitochondria while the rate of ATP synthesis is inhibited only partially: modulation by phosphate.
TLDR
Adenylate kinase activity was much smaller in yeast mitochondria than in rat liver mitochondria and thus did not account for the synthesis of ATP observed in the presence of K+.
A Saccharomyces cerevisiae Mutant Lacking a K+/H+ Exchanger
TLDR
Mutant cells produced a greater acidification of the medium coincident with an internal pH alkalinization and showed a higher oxygen consumption velocity, and it is speculated that higher K+ accumulation and increased osmotic pressure accelerate the cell cycle and metabolic activity.
A glycolytic metabolon in Saccharomyces cerevisiae is stabilized by F‐actin
TLDR
The role of filamentous actin (F‐actin) in stabilization of a putative glycolytic metabolon is reported and it is suggested that this complex probably uses the cytoskeleton to stabilize the interaction of the various enzymes.
Glycolytic sequence and respiration of Debaryomyces hansenii as compared to Saccharomyces cerevisiae
TLDR
Levels of glycolytic intermediaries after glucose addition, and enzyme activities, indicated that the main difference and limiting step to explain the lower fermentation of D. hansenii is phosphofructokinase activity, which seems to play a role in defining the fermentation rates of the two yeasts.
Sodium and potassium transport in the halophilic yeast Debaryomyces hansenii
TLDR
It can be concluded that Na+ in D. hansenii is not excluded but instead, its metabolic systems must be resistant to high salt concentrations.
Comparative analysis of trehalose production by Debaryomyces hansenii and Saccharomyces cerevisiae under saline stress
TLDR
The comparative analysis of growth, intracellular content of Na+ and K+, and the production of trehalose in the halophilic Debaryomyces hansenii and Saccharomyces cerevisiae were determined under saline stress found that D. hansenII showed a higher production of Trehalose, compared to S. cerevisae strains under similar conditions.
Proton pumping and the internal pH of yeast cells, measured with pyranine introduced by electroporation
TLDR
Values for the cytoplasmic pHs of yeast cells that were higher than those reported previously were obtained, probably because this fluorescent indicator did not seem to penetrate into the cell vacuole.
Effects of high medium pH on growth, metabolism and transport in Saccharomyces cerevisiae.
TLDR
Fermentation was moderately decreased by high pH and respiration was similar and sensitive to the addition of an uncoupler, ATP and glucose-6-phosphate levels upon glucose addition increased to similar levels and proton pumping and K(+) transport were also not affected; all this indicating that energy mechanisms were preserved.
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