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Based on a review of literature published in refereed archival journals, ventilation rates in classrooms often fall far short of the minimum ventilation rates specified in standards. There is compelling evidence, from both cross sectional and intervention studies, of an association of increased student performance with increased ventilation rates. There is evidence that reduced respiratory health effects and reduced student absence are associated with increased ventilation rates. Increasing ventilation rates in schools imposes energy costs and can increase HVAC system capital costs. The net annual costs, ranging from a few dollars to about ten dollars per person, are less than 0.1% of typical public spending on elementary and secondary education in the US. Such expenditures seem like a small price to pay given the evidence of health and performance benefits. This article is protected by copyright. All rights reserved.
Methoxyflurane was developed as an anaesthetic agent and introduced into clinical practice in 1960. It soon became evident that it possessed analgesic properties that other drugs did not. Due to toxicity concerns, it lost favour in general anaesthesia and had been largely abandoned by the late 1970’s. The manufacturer withdrew it in 1999, and the Food and Drug Administration in the United States did not renew its license in 2005. It has also been withdrawn by the European Union. However, it continues to be used in Australasia, primarily as an inhaled self-administered analgesic by emergency services immediately following trauma. It has become attractive for use in dental practice, likely due to its effectiveness as an analgesic and its additional sedative qualities. Its acceptance is controversial as its use in dentistry is largely elective. Despite its good safety record in analgesic doses, adverse reactions have been recorded. Practitioners should be well aware of risks associated with its use before considering administration, and carefully assess whether or not there are equally good alternative options that do not the carry the same risks. Methoxyflurane is reviewed below with an emphasis on its use in dental practice. This article is protected by copyright. All rights reserved.
Plant-growth promoting rhizobacteria (PGPR) are studied as complements/alternatives to chemical fertilization in agriculture. Poor information however, exists on the potential of PGPR from undisturbed ecosystems. Here, we evaluated the plant growth-promoting (PGP) effect of rhizobacterial consortia from undisturbed Chilean arid-ecosystems (Consortium C1) and agro-ecosystems (Consortium C2) on plant biomass production. The PGP effects of C1 and C2 were assayed in wheat seedlings (Triticum aestivum L.) grown in pots under growth chamber conditions and in pots placed in an open greenhouse under natural conditions, using two different Chilean Andisols (Piedras Negras and Freire series) kept either at 30% or 60% of their maximum water holding capacity (MWHC). PGP effects depended on the soil type, MWHC and the growth conditions tested. Although both consortia showed PGB effects in artificial soils relative to controls in growth chambers, only C1 provoked a PGP effect at 60% MWHC in phosphorus-poor soil of the ‘Piedras Negras’ series. At natural conditions, however, only C1 exhibited statistically significant PGP effects at 30% MWHC in ‘Piedras Negras’, yet and most importantly allowed to maintain similar plant biomass as at 60% MWHC. Our results support possible applications of rhizobacterial consortia from arid ecosystems to improve wheat growth in Chilean Andisols under water shortage conditions. This article is protected by copyright. All rights reserved.
Iron deficiency, even in the absence of anemia, can be debilitating, and exacerbate any underlying chronic disease, leading to increased morbidity and mortality. Iron deficiency is frequently concomitant with chronic inflammatory disease; however, iron deficiency treatment is often overlooked, partially due to the heterogeneity among clinical practice guidelines. In the absence of consistent guidance across chronic heart failure, chronic kidney disease and inflammatory bowel disease, we provide practical recommendations for iron deficiency to treating physicians: definition, diagnosis, and disease-specific diagnostic algorithms. These recommendations should facilitate appropriate diagnosis and treatment of iron deficiency to improve quality of life and clinical outcomes. This article is protected by copyright. All rights reserved.
Due to the remarkable global surge in activity in rare diseases research over the last six years, including contributions by the International Rare Diseases Research Consortium (IRDiRC), the Consortium’s 2020 goals have been largely achieved by 2017. Though these developments are gratifying, enormous challenges remain. With this paradox in mind, IRDiRC set new global rare disease goals for the coming decade with the ultimate aim of improved health for people living with rare diseases worldwide. This article is protected by copyright. All rights reserved.
In 2011, the International Rare Diseases Research Consortium (IRDiRC) was formed to unite public and private sector funders of research, patient advocacy groups, and scientific researchers to advance rare diseases research worldwide. Six years after its official launch, IRDiRC is now reflecting on its progress and achievements toward its ambitious goals for the rare diseases research collective - to develop 200 new therapies and the means to diagnose most rare genetic diseases by the year 2020. This article is protected by copyright. All rights reserved.
Lying is a pervasive human behavior. Evidence to date suggests that from the age of 42 months onward, children become increasingly capable of telling lies in various social situations. However, there is limited experimental evidence regarding whether very young children will tell lies spontaneously. The present study investigated the emergence of lying in very young children. Sixty-five 2- to 3-year-olds were asked not to peek at a toy when the experimenter was not looking. The majority of children (80%) transgressed and peeked at the toy. When asked whether they had peeked at the toy, most 2-year-old peekers were honest and confessed to their peeking, but with increased age, more peekers denied peeking and thus lied. However, when asked follow-up questions that assessed their ability to maintain their initial lies, most children failed to conceal their lie by pretending to be ignorant of the toy’s identity. Additionally, after controlling for age, children’s executive functioning skills significantly predicted young children’s tendency to lie. These findings suggest that children begin to tell lies at a very young age. (PsycINFO Database Record © 2013 APA, all rights reserved).
Architects and engineers are beginning to consider a new dimension of indoor air: the structure and composition of airborne microbial communities. A first step in this emerging field is to understand the forces that shape the diversity of bioaerosols across space and time within the built environment. In an effort to elucidate the relative influences of three likely drivers of indoor bioaerosol diversity - variation in outdoor bioaerosols, ventilation strategy, and occupancy load - we conducted an intensive temporal study of indoor airborne bacterial communities in a high-traffic university building with a hybrid HVAC (mechanically- and naturally-ventilated) system. Indoor air communities closely tracked outdoor air communities, but human-associated bacterial genera were more than twice as abundant in indoor air compared to outdoor air. Ventilation had a demonstrated effect on indoor airborne bacterial community composition; changes in outdoor air communities were detected inside following a time lag associated with differing ventilation strategies relevant to modern building design. Our results indicate that both occupancy patterns and ventilation strategies are important for understanding airborne microbial community dynamics in the built environment. This article is protected by copyright. All rights reserved.
- Health psychology : official journal of the Division of Health Psychology, American Psychological Association
- Published over 6 years ago
Objective: In contrast to proposals that physical activity (PA) can be a substitute for alcohol use, people who engage in greater overall PA generally consume more alcohol on average than less-active peers. Acknowledging that both PA and alcohol use vary considerably from day-to-day, this study evaluated whether established associations reflect daily behavioral coupling within-person, are an artifact of procedures that aggregate behavior over time, or both. Methods: A life span sample of 150 adults (aged 19-89 years) completed three 21-day measurement bursts of a daily diary study. At the end of each day, they reported on their PA and alcohol consumption. Data were analyzed in a negative binomial multilevel regression. Results: As expected, both behaviors exhibited limited between-person variation. After controlling for age, gender, and seasonal and social calendar influences, daily deviations in PA were significantly associated with daily total alcohol use. Once the within-person process linking PA and alcohol use was controlled, usual PA and total alcohol use were not associated. Conclusions: The established between-person association linking PA and alcohol use reflects the aggregation of a daily process that unfolds within-people over time. Further work is needed to identify mediators of this daily association and to evaluate causality, as well as to investigate these relations in high-risk samples. (PsycINFO Database Record © 2014 APA, all rights reserved).
- Evolution; international journal of organic evolution
- Published almost 5 years ago
Most birds vocalize with an open beak, but vocalization with a closed beak into an inflating cavity occurs in territorial or courtship displays in disparate species throughout birds. Closed-mouth vocalizations generate resonance conditions that favor low-frequency sounds. By contrast, open-mouth vocalizations cover a wider frequency range. Here we describe closed-mouth vocalizations of birds from functional and morphological perspectives and assess the distribution of closed-mouth vocalizations in birds and related outgroups. Ancestral-state optimizations of body size and vocal behavior indicate that closed-mouth vocalizations are unlikely to be ancestral in birds and have evolved independently at least 16 times within Aves, predominantly in large-bodied lineages. Closed-mouth vocalizations are rare in the small-bodied passerines. In light of these results and body size trends in non-avian dinosaurs, we suggest that the capacity for closed-mouth vocalization was present in at least some extinct non-avian dinosaurs. As in birds, this behavior may have been limited to sexually selected vocal displays, and hence would have co-occurred with open-mouthed vocalizations. This article is protected by copyright. All rights reserved.