Publications by authors named "M A Torrez"
Article Synopsis
- The study focused on how adding 1 wt. lead (Pb) affects the plastic deformation and microstructure of pure copper (Cu) and Cu alloys, particularly at grain boundaries where Pb forms precipitates.
- Various advanced techniques were used, including neutron diffraction and electron microscopy, to examine the behavior of these materials under stress at different scales.
- Results showed that while the overall deformation responses were similar for both materials, the Cu-1Pb alloy had a higher dislocation density and the presence of lead significantly influenced local deformation, providing important insights for improving structural materials in engineering.
Fluorescence emission from tryptophan residues has been often used to probe the protein structure due to its transition dipole moment sensitivity to the local environment. We report the fluorescence study of a collagen-like peptide heterotrimer modified with the tryptophan in the X position (X-Y-Gly) that shows the diminished fluorescence in a homotrimer versus a heterotrimer when the L state is selectively excited. This behavior is only observed in folded peptides, below the helix-to-coil transition temperature, and can be explained by long-range interactions between the tryptophans located on different strands within the triple helix, not by the change in the local environment.
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- Distinguishing a single heterogeneous tumor from multiple collision tumors presents challenges for pathologists, especially in small biopsies exhibiting histologic variations.
- The case report involves a female former smoker with a lung mass and a metastatic bone lesion, where a needle biopsy showed mixed adenocarcinoma differentiation.
- Next-generation sequencing confirmed the presence of two distinct primary tumors within the same small needle biopsy sample.
Environmental mercury (Hg) contamination of the global tropics outpaces our understanding of its consequences for biodiversity. Knowledge gaps of pollution exposure could obscure conservation threats in the Neotropics: a region that supports over half of the world's species, but faces ongoing land-use change and Hg emission via artisanal and small-scale gold mining (ASGM). Due to their global distribution and sensitivity to pollution, birds provide a valuable opportunity as bioindicators to assess how accelerating Hg emissions impact an ecosystem's ability to support biodiversity, and ultimately, global health.
View Article and Find Full Text PDFFemale urethral adenocarcinoma (FUA) is extremely rare. It is an aggressive malignancy, and clear cell and columnar/mucinous ("intestinal") represent the two primary histologic subtypes. Diagnosis is often delayed in patients because of their vague symptomatology; hence, they present with an advanced disease and a poor prognosis.
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