Science in the Middle School Revisited: Contrasting 1965 with 1990

Describing science as middle school students experience it continues to be a challenge. The science that students experience in the classroom is that which their teachers have selected and organized for them. This selection/organization process is itself guided by the teacher\u27s knowledge base and the expectations of the schooling context. Presented here is a contrast practiced in the middle school in 1990 with 1965. The findings show that while teachers today may be better prepared in terms of academic courses, they are still not being adequately prepared to work with the emerging adolescent in the middle school

A Business Case for Tele-Intensive Care Units

Objectives: A tele-intensive care unit (tele-ICU) uses telemedicine in an intensive care unit (ICU) setting, applying technology to provide care to critically ill patients by off-site clinical resources. The purpose of this review was to examine the implementation, adoption, and utilization of tele-ICU systems by hospitals to determine their efficiency and efficacy as identified by cost savings and patient outcomes. Methods: This literature review examined a large number of studies of implementa­tion of tele-ICU systems in hospitals. Results: The evidence supporting cost savings was mixed. Implementation of a tele- ICU system was associated with cost savings, shorter lengths of stay, and decreased mortality. However, two studies suggested increased hospital cost after implementa­tion of tele-ICUs is initially expensive but eventually results in cost savings and better clinical outcomes. Conclusions: Intensivists working these systems are able to more effectively treat ICU patients, providing better clinical outcomes for patients at lower costs compared with hospitals without a tele-ICU

The Business Case for the Efficiency and Effectiveness of Tele-Intensive Care Units

A tele-Intensive Care Unit (tele-ICU) is the use of telemedicine in an Intensive Care Unit (ICU) setting, using technology to provide care to critically ill patients by off-site clinical resources. This literature review examined a large number of studies of the implementation of tele-ICU systems in hospitals. Generally, implementation of a tele-ICU system was associated with cost savings, shorter lengths of stay, and decreased mortality. Implementation of tele-ICUs is initially relatively expensive but result in cost savings and better clinical outcomes. Intensivists working these systems are used more effective providing better clinical outcomes for patients at lower costs for hospitals

An Inservice Model to Impact Life Science Classroom Practice: Part One

A model inservice program built on a theoretical foundation for changing behavior incorporates both teachers\u27 knowledge, their attitudes as well as what they do. What teachers do in the classroom depends on both what they know and how they feel about what they know, Changing what teachers know and do is accomplished in a three phase sequence, awareness, arousal and action. In the awareness phase, teachers are confronted with their knowledge needs. In the arousal phase, teacher generate interest in using what they know. Action is reflected in what teachers do and is reinforced when they have time to reflect on that action, its effect, its value and acceptance

An Inservice Model to Impact Life-Science Classroom Practice: Part Two

This model for an inservice program describes why teachers change the nature of their students\u27 experiences in science. In the evaluation study with 7th grade Life Science teachers in Southeast, evidence showed that as teachers\u27 knowledge in specific topics in biology was enhanced, their classroom use of this knowledge also changed. As their knowledge of science and alternative teaching practices was expanded, their attitudes toward teaching showed that they were more aware that there was more to learn but were also more confident that they could acquire the new knowledge they needed. In their classroom, their concerns for students showed significant shifts toward involving students more in their learning rather than being most concerned about managing or controlling them. This was especially true if there was an institutional willingness for them to use different teaching strategies. Thus based on this evaluation study, teachers are more likely to change if the changes are consistent with the external demands of their schooling context; and their internal belief systems

Auditory enhancement of visual temporal order judgment

Abstract: Although numerous studies have shown that response times can be speeded by the presentation of multisensory stimuli, here we show that such speeding can be seen even when the second sensory channel fails to provide any task-relevant (i.e. redundant) information, and where cueing appears an unlikely explanation. Study participants performed a visual temporal order judgment task in the presence of task uninformative auditory cues, with the latter sound delayed relative to the latter visual cue. Responses were maximally speeded when the auditory stimulus was delayed by a short time (i.e. 100 ms) relative to the second visual target. These results illustrate a unique form of temporal benefit underlying a multisensory interaction, and form the basis for a novel explanation of these perceptual enhancements

Behavioral responses of the endemic shrimp Halocardina rubra (Malacostraca:Atyidae) to an introduced fish, Gambusia affinis (Actinopterygii: Poeciliidae) and implications for the trophic structure of Hawaiian anchialine ponds

In the Hawaiian Islands, intentionally introduced exotic fishes have been linked to changes in native biodiversity and community composition. In 1905, the mosquito fish Gambusia affinis was introduced to control mosquitoes. Subsequently, G. affinis spread throughout the Islands and into coastal anchialine ponds. Previous studies suggest that presence of invasive fishes in anchialine ponds may eliminate native species, including the endemic shrimp Halocaridina rubra. We examined effects of G. affinis on H. rubra populations in anchialine ponds on the Kona-Kohala coast of the island of Hawai/i. In the presence of G. affinis, H. rubra exhibited a diel activity pattern that was not seen in fishless ponds. Shrimp in ponds with fish were active only at night. This pattern was evident in anchialine ponds and in laboratory experiments. In laboratory predation experiments, G. affinis preferentially consumed smaller H. rubra, and in the field the H. rubra collected from invaded sites were larger than those from fishless ponds. Analysis of trophic position using stable isotope analyses showed that feeding of H. rubra was not significantly distinct from that of snails, assumed to feed at trophic level 2.0 on epilithic algae, but G. affinis was slightly omnivorous, feeding at tropic level 2.2. The mosquito fish diet was apparently composed primarily of algae when the defensive behavior of H. rubra made them substantially unavailable as prey. The effect of successful establishment of G. affinis on shrimp behavior has the potential to alter abundance of benthic algae and processing and recycling of nutrients in anchialine pond ecosystems

Dimension-specific attention directs learning and listening on auditory training tasks

The relative contributions of bottom-up versus top-down sensory inputs to auditory learning are not well established. In our experiment, listeners were instructed to perform either a frequency discrimination (FD) task ("FD-train group") or an intensity discrimination (ID) task ("ID-train group") during training on a set of physically identical tones that were impossible to discriminate consistently above chance, allowing us to vary top-down attention whilst keeping bottom-up inputs fixed. A third, control group did not receive any training. Only the FD-train group improved on a FD probe following training, whereas all groups improved on ID following training. However, only the ID-train group also showed changes in performance accuracy as a function of interval with training on the ID task. These findings suggest that top-down, dimension-specific attention can direct auditory learning, even when this learning is not reflected in conventional performance measures of threshold change

Spatial Learning Depends on Both the Addition and Removal of New Hippocampal Neurons

The role of adult hippocampal neurogenesis in spatial learning remains a matter of debate. Here, we show that spatial learning modifies neurogenesis by inducing a cascade of events that resembles the selective stabilization process characterizing development. Learning promotes survival of relatively mature neurons, apoptosis of more immature cells, and finally, proliferation of neural precursors. These are three interrelated events mediating learning. Thus, blocking apoptosis impairs memory and inhibits learning-induced cell survival and cell proliferation. In conclusion, during learning, similar to the selective stabilization process, neuronal networks are sculpted by a tightly regulated selection and suppression of different populations of newly born neurons