Defining contribution: A scoping review.

INTRODUCTION: The term contribution is a key feature of approaches to positive youth development but has yet to be adequately defined. The purposes of this study were to identify properties that underlie contribution and to establish a theoretical definition of the construct. METHODS: A two-phase scoping review was conducted. The first phase involved the systematic search, selection, and analysis of studies from which six properties of contribution were identified and a preliminary theoretical definition was constructed. In the second phase expert judges rated the degree to that the proposed definition and the six properties of contribution fit with their conceptualization of the construct on a 6-point scale. RESULTS: Mean ratings for the definition and the six properties ranged from 5.05 to 5.70. Judges' ratings for the overall definition of contribution and the six properties were evaluated using Aiken's content validity coefficient (V). All V coefficients ranged in size from 0.81 to 0.94 and were statistically significant (p's < .01) indicating that the definition of contribution and the corresponding six properties fit well with experts' conceptualizations of the construct. CONCLUSION: This study provides a theoretical definition of contribution that will serve as a foundation upon which future research in the area of positive youth development can build.

How Do Sport Parents Engage in Autonomy-Supportive Parenting in the Family Home Setting? A Theoretically Informed Qualitative Analysis.

The purpose of this study was to identify and examine how sport parents engage in autonomy-supportive parenting in the family home setting. A total of 44 parents and children from 19 families were initially interviewed. Data from these families were profiled to identify seven families that adopted a highly autonomy-supportive parenting style. The seven families' data were then examined using a theoretically focused qualitative analysis using the three dimensions of autonomy-supportive parenting. Sport parents engaged in autonomy support (vs. control) through flexible conversations and supporting decision making. The themes of boundary setting and establishing expectations based on values were indicative of structure. The authors found high levels of involvement across contexts. These findings depict the nature and types of social interactions in the family home that created an autonomy-supportive emotional climate, which often extended to sport, providing a foundation for future theoretical development and applied research in sport.

Combined effects of agrochemicals and ecosystem services on crop yield across Europe.

Simultaneously enhancing ecosystem services provided by biodiversity below and above ground is recommended to reduce dependence on chemical pesticides and mineral fertilisers in agriculture. However, consequences for crop yield have been poorly evaluated. Above ground, increased landscape complexity is assumed to enhance biological pest control, whereas below ground, soil organic carbon is a proxy for several yield-supporting services. In a field experiment replicated in 114 fields across Europe, we found that fertilisation had the strongest positive effect on yield, but hindered simultaneous harnessing of below- and above-ground ecosystem services. We furthermore show that enhancing natural enemies and pest control through increasing landscape complexity can prove disappointing in fields with low soil services or in intensively cropped regions. Thus, understanding ecological interdependences between land use, ecosystem services and yield is necessary to promote more environmentally friendly farming by identifying situations where ecosystem services are maximised and agrochemical inputs can be reduced.

Soil food web properties explain ecosystem services across European land use systems.

Intensive land use reduces the diversity and abundance of many soil biota, with consequences for the processes that they govern and the ecosystem services that these processes underpin. Relationships between soil biota and ecosystem processes have mostly been found in laboratory experiments and rarely are found in the field. Here, we quantified, across four countries of contrasting climatic and soil conditions in Europe, how differences in soil food web composition resulting from land use systems (intensive wheat rotation, extensive rotation, and permanent grassland) influence the functioning of soils and the ecosystem services that they deliver. Intensive wheat rotation consistently reduced the biomass of all components of the soil food web across all countries. Soil food web properties strongly and consistently predicted processes of C and N cycling across land use systems and geographic locations, and they were a better predictor of these processes than land use. Processes of carbon loss increased with soil food web properties that correlated with soil C content, such as earthworm biomass and fungal/bacterial energy channel ratio, and were greatest in permanent grassland. In contrast, processes of N cycling were explained by soil food web properties independent of land use, such as arbuscular mycorrhizal fungi and bacterial channel biomass. Our quantification of the contribution of soil organisms to processes of C and N cycling across land use systems and geographic locations shows that soil biota need to be included in C and N cycling models and highlights the need to map and conserve soil biodiversity across the world.

Intensive agriculture reduces soil biodiversity across Europe.

Soil biodiversity plays a key role in regulating the processes that underpin the delivery of ecosystem goods and services in terrestrial ecosystems. Agricultural intensification is known to change the diversity of individual groups of soil biota, but less is known about how intensification affects biodiversity of the soil food web as a whole, and whether or not these effects may be generalized across regions. We examined biodiversity in soil food webs from grasslands, extensive, and intensive rotations in four agricultural regions across Europe: in Sweden, the UK, the Czech Republic and Greece. Effects of land-use intensity were quantified based on structure and diversity among functional groups in the soil food web, as well as on community-weighted mean body mass of soil fauna. We also elucidate land-use intensity effects on diversity of taxonomic units within taxonomic groups of soil fauna. We found that between regions soil food web diversity measures were variable, but that increasing land-use intensity caused highly consistent responses. In particular, land-use intensification reduced the complexity in the soil food webs, as well as the community-weighted mean body mass of soil fauna. In all regions across Europe, species richness of earthworms, Collembolans, and oribatid mites was negatively affected by increased land-use intensity. The taxonomic distinctness, which is a measure of taxonomic relatedness of species in a community that is independent of species richness, was also reduced by land-use intensification. We conclude that intensive agriculture reduces soil biodiversity, making soil food webs less diverse and composed of smaller bodied organisms. Land-use intensification results in fewer functional groups of soil biota with fewer and taxonomically more closely related species. We discuss how these changes in soil biodiversity due to land-use intensification may threaten the functioning of soil in agricultural production systems.

THE AFFORDABLE CARE ACT: A HIDDEN JOBS KILLER?

Many opponents of the Affordable Care Act (ACA) predicted the law would hurt employment. A common complaint was that the requirement that firms employing more than 50 employees either provide insurance for employees working more than 30 hours a week or pay a penalty would lead many firms to cut back workers' hours to just below the 30-hour cutoff. This article uses the Current Population Survey to compare the share of workers employed between 25-29 hours in the first four months of 2013 with the same months of 2012. While the Obama administration subsequently delayed the application of this portion of the ACA, at the time larger employers would have expected to be subject to the insurance requirement. The analysis found the share of employment in this hour band was slightly lower in 2013 than in 2012.

A grounded theory of personal development in high-performance sport environments.

OBJECTIVES: The purpose of this study was to develop a grounded theory of how to promote personal development in high-performance sport environments. METHODOLOGY: Individual interviews were conducted with 32 members of the Canadian junior and senior national biathlon teams, including 18 athletes (9 women, 9 men, Mage = 20.8 years, SD = 2.9), 5 coaches (1 woman, 4 men), 3 technical leaders (2 women, 1 man), and 6 parents (3 mothers, 3 fathers). Follow-up interviews were conducted with five key participants. Straussian grounded theory methodology was used. Analytic techniques included open coding, constant comparison, questioning, memoing, diagramming, and theoretical integration. RESULTS: The grounded theory is based on the core category that personal development is a continual and individualized process. Three propositions represent how to promote athletes' personal development process. Proposition 1: Athletes use realistic self-evaluation and goal setting. Proposition 2: Athletes experience different situations and reflect on their areas for personal development. Proposition 3: Athletes perceive and receive social support. CONCLUSION: The grounded theory portrays propositions that can be used to promote athletes' personal development in high-performance sport environments. It may inform future applied research and the delivery of sport psychology support to high-performance athletes.

Conventional agriculture and not drought alters relationships between soil biota and functions.

Soil biodiversity constitutes the biological pillars of ecosystem services provided by soils worldwide. Soil life is threatened by intense agricultural management and shifts in climatic conditions as two important global change drivers which are not often jointly studied under field conditions. We addressed the effects of experimental short-term drought over the wheat growing season on soil organisms and ecosystem functions under organic and conventional farming in a Swiss long term trial. Our results suggest that activity and community metrics are suitable indicators for drought stress while microbial communities primarily responded to agricultural practices. Importantly, we found a significant loss of multiple pairwise positive and negative relationships between soil biota and process-related variables in response to conventional farming, but not in response to experimental drought. These results suggest a considerable weakening of the contribution of soil biota to ecosystem functions under long-term conventional agriculture. Independent of the farming system, experimental and seasonal (ambient) drought conditions directly affected soil biota and activity. A higher soil water content during early and intermediate stages of the growing season and a high number of significant relationships between soil biota to ecosystem functions suggest that organic farming provides a buffer against drought effects.

Effects of simulated drought on biological soil quality, microbial diversity and yields under long-term conventional and organic agriculture.

Drought and agricultural management influence soil microorganisms with unknown consequences for the functioning of agroecosystems. We simulated drought periods in organic (biodynamic) and conventional wheat fields and monitored effects on soil water content, microorganisms and crops. Above the wilting point, water content and microbial respiration were higher under biodynamic than conventional farming. Highest bacterial and fungal abundances were found in biodynamically managed soils, and distinct microbial communities characterised the farming systems. Most biological soil quality parameters and crop yields were only marginally affected by the experimental drought, except for arbuscular mycorrhizal fungi (AMF), which increased in abundance under the experimental drought in both farming systems. AMF were further strongly promoted by biodynamic farming resulting in almost three times higher AMF abundance under experimental drought in the biodynamic compared with the conventional farming system. Our data suggest an improved water storage capacity under biodynamic farming and confirms positive effects of biodynamic farming on biological soil quality. The interactive effects of the farming system and drought may further be investigated under more substantial droughts. Given the importance of AMF for the plant's water supply, more in-depth studies on AMF may help to clarify their role for yields under conditions predicted by future climate scenarios.

Soil networks become more connected and take up more carbon as nature restoration progresses.

Soil organisms have an important role in aboveground community dynamics and ecosystem functioning in terrestrial ecosystems. However, most studies have considered soil biota as a black box or focussed on specific groups, whereas little is known about entire soil networks. Here we show that during the course of nature restoration on abandoned arable land a compositional shift in soil biota, preceded by tightening of the belowground networks, corresponds with enhanced efficiency of carbon uptake. In mid- and long-term abandoned field soil, carbon uptake by fungi increases without an increase in fungal biomass or shift in bacterial-to-fungal ratio. The implication of our findings is that during nature restoration the efficiency of nutrient cycling and carbon uptake can increase by a shift in fungal composition and/or fungal activity. Therefore, we propose that relationships between soil food web structure and carbon cycling in soils need to be reconsidered.

Non-sedation versus sedation with a daily wake-up trial in critically ill patients receiving mechanical ventilation (NONSEDA Trial): study protocol for a randomised controlled trial.

BACKGROUND: Through many years, the standard care has been to use continuous sedation of critically ill patients during mechanical ventilation. However, preliminary randomised clinical trials indicate that it is beneficial to reduce the sedation level. No randomised trial has been conducted comparing sedation with no sedation, a priori powered to have all-cause mortality as primary outcome.The objective is to assess the benefits and harms of non-sedation versus sedation with a daily wake-up trial in critically ill patients. METHODS/DESIGN: The non-sedation (NONSEDA) trial is an investigator-initiated, randomised, clinical, parallel-group, multinational trial designed to include 700 patients from at least six ICUs in Denmark, Norway and Sweden.Inclusion criteria are mechanically ventilated patients with expected duration of mechanical ventilation >24 hours.Exclusion criteria are non-intubated patients, patients with severe head trauma, coma at admission or status epilepticus, patients treated with therapeutic hypothermia, patients with PaO2/FiO2 < 9 where sedation might be necessary to ensure sufficient oxygenation or place the patient in prone position.Experimental intervention is non-sedation supplemented with pain management during mechanical ventilation.Control intervention is sedation with a daily wake-up trial.The primary outcome will be all cause mortality at 90 days after randomization. Secondary outcomes will be: days until death throughout the total observation period; coma- and delirium-free days; highest RIFLE score; days until discharge from the intensive care unit (within 28 days); days until the participant is without mechanical ventilation (within 28 days); and proportion of patients with a major cardiovascular outcome. Explorative outcomes will be: all cause mortality at 28 days after randomisation; days until discharge from the intensive care unit; days until the participant is without mechanical ventilation; days until discharge from the hospital; organ failure.Trial size: we will include 700 participants (2 × 350) in order to detect or reject 25% relative risk reduction in mortality with a type I error risk of 5% and a type II error risk of 20% (power at 80%). DISCUSSION: The trial investigates potential benefits of non-sedation. This might have large impact on the future treatment of mechanically ventilated critically ill patients. TRIAL REGISTER: ClinicalTrials.gov NCT0196768, 09.01.2014.

[Severe hypernatraemia can be treated with continuous veno-venous haemodialysis]. / Svær hypernatriæmi kan behandles med kontinuerlig veno-venøs hæmodialyse.

Hypernatraemia is a common and potentially serious condition in the intensive care unit (ICU). We present a case, a 84-year-old man, who was admitted to the ICU with septic shock due to pneumonia. After successful fluid resuscitation and antibiotic treatment the patient was stable, but severely oedematose and developed hypernatraemia (S-Na 165 mmol/l) with cerebral symptoms. Urine-Na was very low. The condition was successfully treated with continuous veno-venous haemodialysis (CVVHD), adding extra Na to the dialysate in order to correct the hypernatraemia at a rate of 8-15 mmol/l per day. Correction of hypernatremia using CVVHD is effective and safe.

[Metformin-associated lactic acidosis can be treated with continuous renal replacement therapy]. / Metforminassocieret laktatacidose kan behandles med kontinuerlig venovenøs hæmofiltration.

Metformin is widely used to treat diabetes. In rare cases, metformin may cause lactic acidosis, especially when administered during periods of dehydration. We present two cases of metformin-associated lactic acidosis (MALA). Both patients presented with metabolic acidosis, hypotension, renal failure and gastrointestinal symptoms. The use of continuous renal replacement therapy (CRRT) had a significant effect. Lactate and metformin can be removed effectively by haemofiltration. CRRT is widely available and a well-known treatment at intensive care units. MALA shows a mortality rate of about 30%.

Phosphatidylinositol-bisphosphate regulates intercellular coupling in cardiac myocytes.

Changes in the lipid composition of cardiac myocytes have been reported during cardiac hypertrophy, cardiomyopathy, and infarction. Because a recent study indicates a relation between low phosphatidylinositol-bisphosphate (PIP(2)) levels and reduced intercellular coupling, we tested the hypothesis that agonist-induced changes in PIP(2) can result in a reduction of the functional coupling of cardiomyocytes and, consequently, in changes in conduction velocity. Intercellular coupling was measured by Lucifer Yellow dye transfer in cultured neonatal rat cardiomyocytes. Conduction velocity was measured in cardiomyocytes grown on microelectrode arrays. Intercellular coupling was reduced by angiotensin II (43.7 +/- 9.3%, N = 11) and noradrenaline (58.0 +/- 10.7%, N = 11). To test if reduced intercellular coupling after agonist stimulation was caused by PIP(2)-depletion, myocytes were stimulated by angiotensin II (57.3 +/- 5.7%, N = 14) and then allowed to recover in medium with or without wortmannin (an inhibitor of PIP(2) synthesis). Intercellular coupling fully recovered in control medium (102.1 +/- 8.9%, N = 10), whereas no recovery occurred in the presence of wortmannin (69.3 +/- 7.8%, N = 12). Inhibition of PKC, calmodulin, or arachidonic acid production did not affect the response to either angiotensin II or noradrenaline. Furthermore, decreasing or increasing PIP(2) also decreased and increased intercellular coupling, respectively. This supports the role of PIP(2) in the regulation of intercellular coupling. In beating myocytes, conduction velocity was reduced by angiotensin II stimulation, and recovery after wash out was prevented by inhibition of PIP(2) production. Reductions in PIP(2) inhibit intercellular coupling in cardiomyocytes, and stimulation by physiologically relevant agonists reduces intercellular coupling by this mechanism. The reduction in intercellular coupling lowered conduction velocity.

Selective foraging of fungi by collembolans in soil.

Soils contain highly diverse communities of microorganisms and invertebrates. The trophic interactions between these species are largely unknown. Collembolans form an abundant part of the invertebrate community in soils. A prevailing view is that soil collembolans are generalist feeders on fungi, lichens, fragmented litter and bacteria. However, in laboratory food choice experiments, it has been shown that collembolans preferentially select certain taxa of fungi. To examine this apparent contradiction, we developed a molecular technique based on the analysis of 18S ribosomal DNA (rDNA) sequences to explore the diversity of fungi in soils and in the guts of collembolans. We report that the diversity of fungi found in the natural soil was 33 times higher than that in the guts of the collembolan Protaphorura armata. The data support the view that collembolan species can be highly selective when foraging on fungi in soils.