A geochemical evaluation of water quality along the course of the Huron River, Northern Ohio

The principal source of water in the Huron River is groundwater. However, other water types also enter the river at various localities along the course of the river. The water in the Huron River consists of a mixture of two groundwater components as well as waters from other sources whose entry into the river changes the chemical composition of the water of the Huron River along its course. Mixing and dilution occur along the entire course of the river. Initially the two groundwater components mix to form water reflecting both components. In addition, various contaminants enter the river and mix with the pristine water already in the river channel. Meteoric water serves as a diluting agent which decreases the concentrations of the elements dissolved in the water. Contaminants enter the river in the form of sewage effluent and industrial waste discharged either directly or via tributary streams. How and to what extent these influxes of water affect the chemical composition of the river can be determined through the interpretation of chemical analyses of water along the river's course. By treating the water as a series of mixtures, we can determine the natural composition of the water without the effects of contamination.No embarg

Control of macrophytes by grass carp (ctenopharyngodon idella) in a Waikato drain, New Zealand

Hornwort (Ceratophyllum demersum L.) and other aquatic macrophytes have historically been mechanically removed from the Rangiriri drain and Churchill East drain to maintain drain efficiency. As an alternative control method for the high plant biomass that accumulates at the end of summer, the effect of stocking diploid grass carp (Ctenopharyngodon idella L.) on the aquatic vegetation was evaluated in these Waikato drainage systems. At the start of the trial, both drains had a low diversity of aquatic macrophytes, and of the nine species (including the emergents), seven were exotic. Two months after grass carp were released to Churchill East drain (the treated drain) the four submerged and floating macrophyte species became scarce in the main drain. Over the same period, these species increased in biomass in Rangiriri drain (the untreated drain), where hornwort became dense and surface-reaching and remained so for the duration of the trial. However, grass carp did not control submerged vegetation in smaller side drains or the shallow, upper parts of the main drain, or the marginal sprawling species and emergent species. The cost of leasing the grass carp was similar to the cost of clearing the drains mechanically, but grass carp provided continuous weed control. However, subsequent to this trial, 62 dead grass carp were found in Churchill East drain in February 2001, and weed cover subsequently increased. This illustrates that grass carp management in New Zealand agricultural drains can be problematic due to periodic fish kills

Perceptions of the learning environment in higher specialist training of doctors: implications for recruitment and retention.

INTRODUCTION: Career choice, sense of professional identity and career behaviour are influenced, subject to change and capable of development through interaction with the learning environment. In this paper workplace learning discourses are used to frame ongoing concerns associated with higher specialist training. Data from the first stage of a multimethods investigation into recruitment into and retention in specialties in the West Midlands is used to consider some possible effects of the specialist learning environment on recruitment and retention. METHODS: The aim of the study was to identify issues, through interviews with 6 consultants and questionnaires completed by specialist registrars from specialties representing a range of recruitment levels. These would inform subsequent study of attributes and dispositions relevant to specialist practice and recruitment. The data were analysed using NVivo software for qualitative data management. RESULTS: Participants' perceptions are presented as bipolar dimensions, associated with: curriculum structure, learning relationships, assessment of learning, and learning climate. They demonstrate ongoing struggle between different models of workplace learning. CONCLUSION: Changes in the postgraduate education of doctors seem set to continue well into the future. How these are reflected in the balance between workplace learning models, and how they influence doctors' sense of identity as specialists suggests a useful basis for examination of career satisfaction and recruitment to specialties

Fish and macroinvertebrates in lowland drainage canals with and without grass carp

Diploid grass carp (Ctenopharyngodon idella L.) were introduced to a lowland Waikato drainage canal at an initial density of 40-80 kg ha -1(83-167 fish ha -1) to control aquatic macrophytes and improve water flow. A near-by canal was left without grass carp to act as an untreated control. After 7 months, macrophytes occupied 17% of the water column in the treated canal compared to 78% in the untreated canal. Fish and macroinvertebrates in both canals were examined before and after the release of grass carp by sampling with replacement by fyke netting on seven occasions. Brown bullhead catfish (Ameiurus nebulosus (Lesueur)) and shortfinned eels (Anguilla australis Richardson) comprised most of the resident fish biomass in both canals; however, before grass carp stocking, eels were more abundant than catfish in the treated canal. There was no change in the abundance of resident fish after stocking, but young-of-the-year catfish had greater mortality and grew faster in the treated canal than in the untreated canal. Macroinvertebrates were primarily associated with aquatic macrophytes. Grass carp reduced aquatic macrophyte abundance in the treated canal by about 80%, which by inference reduced the abundance of associated macroinvertebrates, but there was no observed impact of grass carp stocking on the resident fish assemblage. We examined the relationship between head width and fish length, and from this determined that 70% of the grass carp could have escaped through the downstream retention screen. Despite this possibility, grass carp remained in the canal and effectively controlled aquatic macrophytes for 18 months

An incubatable direct current stimulation system for in vitro studies of Mammalian cells.

The purpose of this study was to provide a simplified alternative technology and format for direct current stimulation of mammalian cells. An incubatable reusable stimulator was developed that effectively delivers a regulated current and does not require constant monitoring

Impacts of Scholarship and Publication on Entry-level Hiring: Public Services Applicants in Academic Libraries in the United States

This study examines the impact of a single knowledge, skill, and ability (KSA), specifically research and publication experience, on the hiring decisions of selection committees for entry-level public services academic librarian positions in the United States. Current library and information science literature contains few studies focusing on a single KSA factor. For this study, respondents (n=141) from a selective sample of 382 institutions of higher education completed an online survey in January and February 2015. The results show that research and publication experience had a greater impact on hiring decisions at urban research universities with large full-time equivalent (FTE) student enrollments, and very large FTE library staff. Forty-five percent of respondents who hired an entry-level public services librarian in the previous 5-year period encouraged research and publication as a primary or secondary duty, and 21% felt its impact on hiring decisions had increased over the previous 10-year period. However, only 14% of respondents categorized research and publication experience as extremely or very important when making hiring decisions. A future investigation of the exact sub-skills associated with research and publication could illustrate how this KSA is currently utilized in the practice of academic librarianship

Intermittent Bolus versus Continuous Infusion of Propofol for Deep Sedation during ABR/Nuclear Medicine Studies

Objective  A comparison of intermittent bolus (IB) versus continuous infusion of propofol for deep sedation. Material and Methods  A retrospective review of patients sedated for Auditory Brainstem Response (ABR)/nuclear medicine studies between September 2008 and February 2015. A ketamine bolus (0.5 mg/kg 20 kg) followed by propofol bolus of 1 mg/kg over 2 minutes. In the IB group, maintenance of deep sedation was with incremental bolus of 10 to 20 mg of propofol. In continuous infusion group (CG), maintenance was with a continuous infusion of 83 mcg/kg/min of propofol. Results  Of the 326 cases completed, 181 were in CG group and 145 were in IB group. There were no statistical differences in patient's age, weight, and American Society of Anesthesiologist (ASA) classification. The cardiovascular and respiratory parameters in the two groups were not different statistically. Mean total propofol dose was higher in CG group versus IB group (CG 7.6 mg ± 3.6 mg, IB 6.5 mg ± 3.6 mg; p  = 0.008). Procedure time in CG group was longer by 8 minutes compared with IB group (CG 49.8 min ± 25.4 min versus 42.3 min ± 19.2 min; p  = .003). CG group has both shorter recovery time (CG 8.1 min ± 4.7 min versus IB 10.0 min ± 8.5 min; p  = 0.01) and discharge time. Conclusion  Satisfactory sedation and completion of the procedure was accomplished with both sedation protocols