Assessing the effects of conductivity on egg development and survival of Eastern Hellbenders (Cryptobranchus a. alleganiensis).

Increasing concentrations of dissolved ions in freshwater ecosystems often stem from anthropogenic sources and have been implicated in the decline of sensitive aquatic organisms. Eastern hellbenders (Cryptobranchus a. alleganiensis) are fully aquatic salamanders that are experiencing range-wide declines and increased conductivity has been suggested as a cause.

Influence of polarized light, disruptive visual patterns, and chemical cues on oviposition in the aquatic midge, Chironomus riparius (Diptera: Chironomidae).

Chironomid nonbiting midges are common in many waterbodies, occurring at high densities in sediment and also when flying adults emerge. Although important for food webs and ecosystem processes, the mass emergences of chironomid adults make some species nuisance pests. As part of an effort to develop "push-pull" strategies for managing midge populations, we investigated the importance of visual and chemical cues used by gravid females when selecting sites for oviposition.

Nurse Practitioner's Confidence and Competence of Advance Directives: The Benefits of an Educational Program.

The increase in the number of people developing dementia, the growing number of geriatric patients suffering and dying from serious chronic diseases, and the rising costs of health care as a result of an aging population have centered attention on advance care planning. Advance care planning is the recurrent conversation between competent patients, their families, and the health care provider about end of life care. Although vital, advance care planning discussions between providers and patients are not occurring regularly, and completion rates of advance directives are low.

Addressing the Lack of Professional Values and Behaviors among New Nurses.

Professionalism and safety in patient care are concepts nurses are expected to exhibit in practice. High fidelity simulation was explored to assist in teaching students the behaviors needed to succeed in nursing. Nursing leaders identified areas in which graduates struggle, including critical thinking, skills acquisition, time management, role responsibilities, delegation, and effective communication.

Predicting mayfly recovery in acid mine-impaired streams using logistic regression models of in-stream habitat and water chemistry.

Mayflies (Order Ephemeroptera) require high quality water and habitat in streams to thrive, so their appearance after restoration is an indicator of ecological recovery. To better understand the importance of restoring in-stream habitat versus water chemistry for macroinvertebrate communities, we developed taxon-specific models of occurrence for five mayfly genera (Caenis, Isonychia, Stenonema, Stenacron, and Baetis) inhabiting streams in the Appalachian Mountains, USA. Presence/absence records from past decades were used to develop single and multiple logistic predictive models based on catchment characteristics (drainage area, gradient), in-stream habitat variables (e.

Use of leaf litter breakdown and macroinvertebrates to evaluate gradient of recovery in an acid mine impacted stream remediated with an active alkaline doser.

The spatial congruence of chemical and biological recovery along an 18-km acid mine impaired stream was examined to evaluate the efficacy of treatment with an alkaline doser. Two methods were used to evaluate biological recovery: the biological structure of the benthic macroinvertebrate community and several ecosystem processing measures (leaf litter breakdown, microbial respiration rates) along the gradient of improved water chemistry. We found that the doser successfully reduced the acidity and lowered dissolved metals (Al, Fe, and Mn), but downstream improvements were not linear.

Plant phenolics behave as radical scavengers in the context of insect (Manduca sexta) hemolymph and midgut fluid.

To evaluate the prooxidant versus antioxidant properties of plant phenolics toward leaf-feeding caterpillars, quenching of the stable ABTS radical by five phenolics was measured in two physiological contexts: hemolymph and midgut fluid. Addition of tannic acid, chlorogenic acid, quercetin, or catechin to Manduca sexta (L.) gut fluid increased its total antioxidant capacity by 12-45%, with tannic acid and quercetin being the most powerful in this regard.

Temporal modulation of pyrrolizidine alkaloid intake and genetic variation in performance of Utetheisa ornatrix caterpillars.

Foraging on a variety of different food items allows individuals to balance nutrient intake, but it also may dilute toxins present in single items of the diet. The distinction between nutrient balancing and toxin dilution becomes less clear, however, for organisms that sequester potentially toxic compounds for their own benefit. Additionally, specific dietary components chosen may or may not affect metabolic rate, growth, and other measures of fitness.