Cross-linked polystyrene-dithiocarbamate polymers: Use in heavy metal removal

Cross-linked polystyrene polymers were converted to dithiocarbamate polymers. These polymers were used to remove heavy metal cations from water. Dithiocarbamate polymers can be understood to be inherently more stable toward hydrolysis than xanthate polymers.     

Duality and transformations in multiphase and sequential linear goal programming

We consider herein a specific type of goal programming model, namely the lexicogrpahic linear goal programming model. Although the two most common methods of solution, the sequential process and the multiphase process, produce the same solutions, the interiors of the final tableaus will differ. We present algorithms which allow one to transform the sequential tableau into the multiphase tableau and vice versa and, in doing so, demonstrate the respective mathematical duals and their relationships. These results are particularly important when performing sensitivity analysis.     

Emotion communication skills in young, middle-aged, and older women.

We assessed the effectiveness of an emotion induction procedure for the study of emotional communication in adults; we also gathered preliminary age-comparative data on the expressive and receptive capacities of a sample of adult women. Young, middle-aged, and older women (encoders) related emotional experiences following mood induction and then assessed the intensity of their affective experiences. Videotapes of these sessions (facial expressions only) were shown to young, middle-aged, and older female judges (decoders), who rated the encoders for emotional intensity as well as for type of affect being communicated. Validity and reliability issues with respect to the procedure's usefulness are discussed. Decoding accuracy was found to vary with age congruence between encoder and decoder, suggesting a decoding advantage accruing through social contact with like-aged peers. Older decoders did most poorly, but a differential warm-up effect was evident, suggesting that the performance of older subjects might be enhanced with practice. There were also trends suggesting that the affective expressions of older subjects may be harder to decode owing to age-related structural changes in the face. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Continuous flow microfluidic device for rapid erythrocyte lysis

Leukocyte isolation from whole blood to study inflammation requires the removal of contaminating erythrocytes. Leukocytes, however, are sensitive to prolonged exposure to hyper/hypoosmotic solutions, temperature changes, mechanical manipulation, and gradient centrifugation. Even though care is taken to minimize leukocyte activation and cell loss during erythrocyte lysis, it is often not possible to completely avoid it. Most procedures for removal of contaminating erythrocytes from leukocyte preparations are designed for bulk processing of blood, where the sample is manipulated for longer periods of time than necessary at the single-cell level. Ammonium chloride-mediated lysis is the most commonly used method to obtain enriched leukocyte populations but has been shown to cause some activation and selective loss of certain cell types. The leukocyte yield and subsequent activation status of residual leukocytes after NH(4)Cl-mediated lysis have been shown to depend on the time of exposure to the lysis buffer. We have developed a microfluidic lysis device that deals with erythrocyte removal at nearly the single-cell level. We can achieve complete lysis of erythrocytes and approximately 100% recovery of leukocytes where the cells are exposed to an isotonic lysis buffer for less than 40 s, after which the leukocytes are immediately returned to physiological conditions. Theoretically, this process can be made massively parallel to process several milliliterss of whole blood to obtain a pure leukocyte population in less than 15 min.     

The use of flight progress strips while working live traffic: frequencies, importance, and perceived benefits

The Federal Aviation Administration's effort to automate air traffic control (ATC) requires that the functionality provided today be captured in future systems. We report the first quantitative naturalistic observation of paper flight progress strip interactions during operational use. Strip use was similar in a variety of situations, but some uses varied as a function of altitude, staffing, or the cooperative style used by controller teams. Design of automation should proceed by prioritizing changes based on frequency of use and importance and should ensure that an effective method of interacting with flight information is incorporated. In addition to applied relevance to the ATC domain, the results touch on several theoretical concerns relevant to dynamic environments. Actual and potential applications of this research include the establishment of a database of strip activity and an arsenal of information valuable to system designers.     

The effect of multiple roles on caregiver stress outcomes.

Some caregivers focus exclusively on the caregiving role; others try to balance caregiving responsibilities with a simultaneous work role outside the home. This study examined competing hypotheses about the impact that greater immersion in a work role would have on the stress outcomes of individuals who provide care for a person with a disability. The authors used national survey data to examine whether hours of work were associated with caregiver stress outcomes. The authors also investigated whether type of disability moderated the relationship between hours worked and stress outcomes. Results suggest that spending more time in a work role generally has no effect on caregiver stress outcomes. However, caregivers who were caring for a person with a mental disability experienced significantly fewer stress outcomes as they spent more hours engaged in outside work. (PsycINFO Database Record (c) 2011 APA, all rights reserved)