Publications by authors named "Alex G Castro"
Article Synopsis
- * This study analyzed the genomes of four specific HN/AD bacterial strains (UFV5, UFV3, UFV2, and UFV4) and found that while they have genes for amino acid and protein production, there were no common nitrogen metabolism genes across the strains.
- * The researchers identified nine potential candidate genes linked to the HN/AD process by comparing these bacterial genomes with existing transcriptomic data, contributing to a better understanding of how these bacteria function in ammonia removal.
In November 2015, a catastrophic rupture of the Fundão dam in Mariana (Brazil), resulted in extensive socio-economic and environmental repercussions that persist to this day. In response, several reforestation programs were initiated to remediate the impacted regions. However, accurately assessing soil health in these areas is a complex endeavor.
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- Bacteria produce extracellular vesicles (EVs) that facilitate communication among microbes and interactions with hosts, with some EVs containing small RNAs (sRNAs) that are not well-studied.
- The study focuses on EVs from a pig pathogen linked to porcine pleuropneumonia, showing minor differences in size and composition between EVs from aerobically and anaerobically grown bacteria.
- Through various methods, the research identified 13 novel sRNAs in the EVs, some associated with virulence, suggesting a potential role in disease processes that requires further investigation.
Article Synopsis
- Sexual rest in bulls leads to lower conception rates, shown by high volumes of ejaculate with many dead sperm, although the exact biochemical reasons are not fully understood.
- A study with six Nellore bulls evaluated their semen through collections, revealing significant differences in sperm quality and biochemical markers between the first and fourth ejaculates.
- Findings indicated that the first ejaculate had poorer enzyme activity and higher lipid peroxidation, whereas the fourth ejaculate showed better sperm quality due to differences in fatty acid composition and protein abundance.
Spathaspora passalidarum is a xylose-fermenting microorganism promising for the fermentation of lignocellulosic hydrolysates. This yeast is more sensitive to ethanol than Saccharomyces cerevisiae for unclear reasons. An RNA-seq experiment was performed to identify transcriptional changes in S.
View Article and Find Full Text PDFPhysiological comparisons among Spathaspora passalidarum, Spathaspora arborariae, and Scheffersomyces stipitis reveal the bottlenecks for their use in the production of second-generation ethanol.
Braz J Microbiol
June 2022
The microbial conversion of pentoses to ethanol is one of the major drawbacks that limits the complete use of lignocellulosic sugars. In this study, we compared the yeast species Spathaspora arborariae, Spathaspora passalidarum, and Sheffersomyces stipitis regarding their potential use for xylose fermentation. Herein, we evaluated the effects of xylose concentration, presence of glucose, and temperature on ethanol production.
View Article and Find Full Text PDFThe yeast Spathaspora passalidarum is able to produce ethanol from D-xylose and D-glucose. However, it is not clear how xylose metabolism is affected by D-glucose when both sugars are available in the culture medium. The aims of this work were to evaluate the influence of D-glucose on D-xylose consumption, ethanol production, gene expression, and the activity of key xylose-metabolism enzymes under both aerobic and oxygen-limited conditions.
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