Stigmasterol Removal by an Aerobic Treatment System.

Stigmasterol is a phytosterol contained in kraft mill effluent that is able to increase over 100% after aerobic biological treatment. This compound can act as an endocrine disrupter as its structure is similar to that of cholesterol. Furthermore, stigmasterol contained in kraft mill effluent shows high toxicity (25-fold more than β-sitosterol) to aquatic organisms such as Daphnia magna.

On the symphytognathoid spider genus Mysmenopsis Simon, 1898 (Araneae: Mysmenidae) from the Brazilian Amazonian region: description of five new species and new records.

Five new species of Mysmenopsis from the Brazilian Amazonian region are described: M. rodriguesae n. sp.

Concentration of Fibroblasts in the Vocal Fold of Elderly.

Objective: To study the concentration of fibroblasts in the vocal folds of elderly people.

Material And Methods: The vocal folds of 13 cadavers were removed and divided into two age groups: Control group: n-5, 18-40 years; Elderly group: n-8, ≥75 years). The vocal folds were dissected and prepared for immunohistochemical analysis using the SA100 antibody to fibroblasts.

Removal of micropollutants by UASB reactor and post-treatment by Fenton and photo-Fenton: Matrix effect and toxicity responses.

Literature is scarce on the performance of Fenton-based processes as post-treatment of municipal wastewater treated by upflow anaerobic sludge blanket (UASB) reactor. This study aims to perform Fenton and photo-Fenton from UASB influent and effluent matrices to remove micropollutants (MPs) models: atrazine (ATZ), rifampicin (RIF), and 17α-ethynylestradiol (EE2). A UASB reactor at bench-scale (14 L) was operated with these MPs, and the AOPs experiments at bench-scale were performed on a conventional photochemical reactor (1 L).

Head and abdomen CT exposures in Portugal.

In Portugal, computed tomography (CT) exposures for adult routine head, adult routine abdomen and paediatric abdomen (5 years old) were evaluated between 2019 and 2020 in 92 CT units. The third quartile value for CTDIwas 63.2 mGy for adult head exams, 15.

Three new species of Camillina Berland, 1919 (Araneae: Gnaphosidae) from Brazil.

The genus Camillina Berland, 1919 includes 75 valid species which are mainly distributed in South America. However, in Brazil, the knowledge regarding Camillina remains limited and a few contributions to the taxonomy of the genus have been made in the last two decades. Camillina belongs to Zelotinae, a group of gnaphosid spiders which diagnostic character is a preening comb on metatarsi III and IV, and the genus can be recognized by the presence of a prolaterally situated, bifid terminal apophysis and medially situated, recessed embolar base on the male palp and a median epigynal plate.

Stigmasterol Removal by an Aerobic Treatment System.

Stigmasterol is a phytosterol contained in Kraft mill effluent that is able to increase over 100% after aerobic biological treatment. This compound can act as an endocrine disrupter as its structure is similar to that of cholesterol. Furthermore, stigmasterol contained in Kraft mill effluent shows high toxicity (25-fold that of β-sitosterol) to aquatic organisms such as Daphnia magna (24-48 h).

Activated sludge versus aerated lagoon treatment of kraft mill effluents containing beta-sitosterol and stigmasterol.

In the present study the performance of an activated sludge system (AS) and an aerated lagoon (AL) are compared for the treatment of kraft cellulose effluents. Both reactors were operated at organic loading rates (OLR) up to 9 g COD/L. d.

Anaerobic biodegradation of sterols contained in kraft mill effluents.

Bleached kraft mill requires large quantities of water and chemicals reactives and generates effluents containing active organic compounds. Specifically, hormonal changes in fish and their communities have been demonstrated, which could be attributed to endocrine-disrupting chemicals (EDCs) contained in kraft mill effluents. This chronic toxicity is attributable to extractive compounds, such as resin acids, sterols, and fatty acids.