Adsorption of PFCAs using polyethyleneimine modified Biochar: Role of chain length and effects of water matrices.

Perfluorocarboxylic acids (PFCAs) are emerging organic pollutants posing a threat to human health and the environment. This study investigates the efficacy of polyethyleneimine-modified biochar (BC-PEI) as an adsorbent for removing PFCAs from a mixed solute system, focusing on competitive adsorption among PFCAs with varying chain lengths. It includes perfluorooctanoic acid (PFOA), perfluorohexanoic acid (PFHxA), hexafluoropropylene-oxide-dimer-acid (GenX), and perfluorobutanoic acid (PFBA).

Narrow Optical Linewidths in Stoichiometric Layered Rare-Earth Crystals.

Rare-earth emitters in solids are well suited for implementing efficient, long-lived quantum memory coupled to integrated photonics for scalable quantum technologies. They are typically introduced as dopants in a solid-state host, but this introduces disorder and limits the available density of emitters. Stoichiometric materials can offer high densities with narrow optical linewidths.

Prevalence of a microsporidian parasite in different social forms of the red imported fire ant, Solenopsis invicta, in its native range in Argentina.

We surveyed 559 colonies of the fire ant Solenopsis invicta in 15 sites in its native range in Argentina for the microsporidian parasite Kneallhazia solenopsae, a natural enemy of this ant. The microsporidium was detected in 20 out of 508 monogyne and nine out of 51 polygyne colonies corresponding to mean infection prevalences of 3.31% and 13.

Synthesis of Layered Gold Tellurides AuSbTe and AuTe and Their Semiconducting and Metallic Behavior.

Previous studies on natural samples of pampaloite (AuSbTe) revealed the crystal structure of a potentially cleavable and/or exfoliable material, while studies on natural and synthetic montbrayite (Sb-containing AuTe) claimed various chemical compositions for this low-symmetry compound. Few investigations of synthetic samples have been reported for both materials, leaving much of their chemical, thermal, and electronic characteristics unknown. Here, we investigate the stability, electronic properties, and synthesis of the gold antimony tellurides AuSbTe and AuSbTe (montbrayite).

Cytomegalovirus Colitis Masquerading as a Recurrent Colonic Polyp in a Patient With Neurofibromatosis Type 1.

Cytomegalovirus colitis most commonly affects immunocompromised patients, although it is a rare cause of gastrointestinal bleeding in immunocompetent patients. Older age, chronic disease, and critical illness are also important risk factors and may lead providers to consider the diagnosis in otherwise immunocompetent patients. Endoscopic presentation is variable and does not significantly influence outcomes.