Publications by authors named "R C Cavalcante"
Ecosystem services provided by terrestrial biomes, such as moisture recycling and carbon assimilation, are crucial components of the water, energy, and biogeochemical cycles. These biophysical processes are influenced by climate variability driven by distant ocean-atmosphere interactions, commonly referred to as teleconnections. This study aims to identify which teleconnections most significantly affect key biophysical processes in South America's two largest biomes: The Amazon and Cerrado.
View Article and Find Full Text PDFBackground: Rhabdomyosarcoma (RMS), a rare malignant tumor, frequently affects pediatric patients, with 35%-40% occurring in the head and neck. This study analyzes the clinicopathologic profile of pediatric head and neck rhabdomyosarcomas from Brazil, Guatemala, Mexico, and South Africa.
Methods: We reviewed 44 cases from 10 Oral and Maxillofacial Pathology services, conducting immunohistochemical analyses of desmin, myogenin, Myo-D1, and Ki67, with quantification via QuPath software.
Article Synopsis
- This study systematically reviews methods for extracting and analyzing organic contaminants in crab urine, which are essential due to crabs' role as bioindicators of aquatic contamination.
- Although harmful substances like PCBs and pesticides are known to affect ecosystems, most studies have focused mainly on PAHs, leaving a significant research gap.
- The perception that collecting crab urine is difficult, along with insufficient methodologies in existing literature, highlights the need for more extensive research to improve ecological understanding and environmental monitoring efforts.
Forensic environmental geochemistry to reveal the extent, characteristics, and fate of waxy tarballs spilled over the northeast coast of Brazil in 2022.
Mar Environ Res
November 2024
Article Synopsis
- The study focused on analyzing tarballs that contaminated the Brazilian coast in late 2022 using forensic environmental geochemistry techniques.
- Gas chromatography and FT-ICR mass spectrometry were employed to identify distinct biomarkers in tarball samples from five Brazilian states, revealing they shared a common source but differed from previous oil spills in 2019 and 2022.
- The analysis indicated that the tarballs were made from mature marine crude oil, showed low weathering, and likely came from ship tank washings, suggesting their potential for long-term environmental impact.