Biological activity of bleached kraft pulp mill effluents before and after activated sludge and ozone treatments.

Eucalyptus bleached kraft pulp production, an important sector of the Brazilian national economy, is responsible for generating large volume, high pollutant load effluents, containing a considerable fraction of recalcitrant organic matter. The objectives of this study were to quantify the biological activity of the effluent from a eucalyptus bleached kraft pulp mill, characterize the nature of compounds responsible for biological activity and assess the effect of ozone treatment on its removal. Primary and secondary effluents were collected bimonthly over the course of one year at a Brazilian bleached eucalypt kraft pulp mill and their pollutant loads (biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), adsorbable organic halogen (AOX), lignin, extractives) and biological activity (acute and chronic toxicity and estrogenic activity) quantified.

Defining a moment in history: parent communication with adolescents about September 11, 2001.

Parents play an important role in helping their children process and interpret significant sociohistorical events. However, little is known about how parents frame these experiences or the specific social, cultural, and civic messages they may communicate about the event. In this study, we examined self-reported communication of parents from six communities in the United States with their adolescents about the September 11, 2001 terrorist attacks.

Chemical components of bleached eucalypt kraft pulp effluent COD and treatment removal efficiency during normal mill operation and maintenance shutdowns.

In order to meet increasingly strict Brazilian COD emissions limits, mills must understand the components that contribute to effluent COD, how these vary between normal mill operation and maintenance shutdowns, and how this variation affects treatment efficiency. To this end, primary and secondary effluents from a Brazilian bleached eucalypt kraft pulp mill activated sludge system were analyzed for COD, lignin, extractives, carbohydrates and AOX over a sixth month period that included two general maintenance shutdowns and four months of normal operation. Primary effluent presented significantly different compositions during periods of normal operation and mill shutdowns.

Longitudinal Changes in Religiosity among Emerging Adult College Students.

Issues of religion are important aspects of the identity process, which for many emerging adults may be intensified by the college experience. This study investigated longitudinal changes in the religiosity of 434 emerging adult college students (52% female) of diverse ethnic backgrounds (32% African American, 29% Latino American, and 39% European American) during the first three semesters of university. Results suggest that changes occur throughout this period, but that such changes are not monolithic across dimensions of religiosity.

A comparison of postoperative throat and neck complaints after the use of the i-gel and the La Premiere disposable laryngeal mask: a double-blinded, randomized, controlled trial.

Background: Many supralaryngeal airway devices are available. Because of the absence of an inflatable cuff, we hypothesized that use of the i-gel should produce fewer postoperative throat and neck complaints compared with a standard disposable laryngeal mask (LM).

Methods: Two hundred eighteen patients were randomized to have either an i-gel or La Premiere LM airway placed for airway management.