Metazoan Endoparasites of the Gecko Phyllopezus periosus (Squamata: Phyllodactylidae) Inhabiting the Rock Cliffs of a Waterfall Canyon in the Semi-Arid Region from Northeastern Brazil.

Purpose: This study describes the composition and infection patterns of macro endoparasites associated with the lizard Phyllopezus periosus.

Methods: We collected 115 P. periosus over 12 expeditions on the rocky cliffs of the Missão Velha waterfall canyon in northeastern Brazil.

Large Interferometer for Exoplanets: VIII. Where Is the Phosphine? Observing Exoplanetary PH with a Space-Based Mid-Infrared Nulling Interferometer.

Phosphine could be a key molecule in the understanding of exotic chemistry that occurs in (exo)planetary atmospheres. While phosphine has been detected in the Solar System's giant planets, it has not been observed in exoplanets to date. In the exoplanetary context, however, it has been theorized to be a potential biosignature molecule.

BAX gene (-248 G > A) polymorphism in a sample of patients diagnosed with thyroid cancer in the Federal District, Brazil.

Introduction: Papillary thyroid cancer corresponds to approximately 1% of all carcinomas; nevertheless, it is the most prevalent endocrine neoplasm in the world. Studies reveal that the (-248 G > A) polymorphism may be associated with negative regulation of gene transcription activity, causing a decrease in its protein expression.

Objective: The present study aimed to describe the genotype and allele frequencies of single nucleotide polymorphisms (-248 G > A) (rs4645878) in the research patients, and to associate its presence with susceptibility to papillary thyroid cancer.

Phosphine on Venus Cannot Be Explained by Conventional Processes.

The recent candidate detection of ∼1 ppb of phosphine in the middle atmosphere of Venus is so unexpected that it requires an exhaustive search for explanations of its origin. Phosphorus-containing species have not been modeled for Venus' atmosphere before, and our work represents the first attempt to model phosphorus species in the venusian atmosphere. We thoroughly explore the potential pathways of formation of phosphine in a venusian environment, including in the planet's atmosphere, cloud and haze layers, surface, and subsurface.

Assessment of Isoprene as a Possible Biosignature Gas in Exoplanets with Anoxic Atmospheres.

The search for possible biosignature gases in habitable exoplanet atmospheres is accelerating, although actual observations are likely years away. This work adds isoprene, CH, to the roster of biosignature gases. We found that isoprene geochemical formation is highly thermodynamically disfavored and has no known abiotic false positives.