The seroconversion history to SARS-CoV-2 in Indigenous people from Brazil - the interplay between exposure, vaccination, and tuberculosis.

The COVID-19 pandemic caused a significant loss of human lives and a worldwide decline in quality of life. Although our understanding of the pandemic has improved significantly since the beginning, the natural history of COVID-19 and its impacts on under-represented populations, such as Indigenous people from America, remain largely unknown. We performed a retrospective serological survey with two Brazilian Indigenous populations (n=624), Tupiniquim and Guarani-Mbyá.

UV 254 nm is more efficient than UV 222 nm in inactivating SARS-CoV-2 present in human saliva.

Ultraviolet (UV) light can inactivate SARS-CoV-2. However, the practicality of UV light is limited by the carcinogenic potential of mercury vapor-based UV lamps. Recent advances in the development of krypton chlorine (KrCl) excimer lamps hold promise, as these emit a shorter peak wavelength (222 nm), which is highly absorbed by the skin's stratum corneum and can filter out higher wavelengths.

Contents of tannins of cultivars of sorghum cultivated in Brazil, as determined by four quantification methods.

High tannin content in sorghum grains is an undesirable characteristic for poultry and pig feeding and represents a challenge for breeding programs. On the other hand, moderate content of tannins in sorghum may be beneficial in human diets because they exert anti-cancer, anti-inflammatory and reduced carbohydrate uptake effects, among others. The aim of this study was to compare tannin contents of twenty sorghum cultivars available in Brazil, as well as to compare results obtained with four methods of tannin quantification: butanol/HCl, vanillin/HCl, BSA/FeCl and PVPP/Folin-Ciocalteu.

Signaling pathway played by salicylic acid, gentisic acid, nitric oxide, polyamines and non-enzymatic antioxidants in compatible and incompatible Solanum-tomato mottle mosaic virus interactions.

Plants are exposed to a vast array of pathogens. The interaction between them may be classified in compatible and incompatible. Polyamines (PAs) are involved in defense responses, as well as salicylic acid (SA), gentisic acid (GA) and nitric oxide (NO), which can increase the content of reactive oxygen species (ROS), creating a harsh environment to the pathogen.

First Complete Genome Sequence of an Isolate of Tomato Mottle Mosaic Virus Infecting Plants of Solanum lycopersicum in South America.

The complete nucleotide sequence of an isolate of tomato mottle mosaic virus (ToMMV) was determined. The virus, originally isolated from symptomatic tomato plants found in a county near the city of São Paulo, Brazil, has a genome with 99% nucleotide sequence identity with ToMMV from Mexico, China, Spain, and the United States.

Influence of viral infection on essential oil composition of Ocimum basilicum (Lamiaceae).

Ocimum basilicum L., popularly known as sweet basil, is a Lamiaceae species whose essential oil is mainly composed of monoterpenes, sesquiterpenes and phenylpropanoids. The contents of these compounds can be affected by abiotic and biotic factors such as infections caused by viruses.