SciCombinator

Discover the most talked about and latest scientific content & concepts.

Concept: Grammatical number

261

To identify what features of online social networks can increase physical activity, we conducted a 4-arm randomized controlled trial in 2014 in Philadelphia, PA. Students (n = 790, mean age = 25.2) at an university were randomly assigned to one of four conditions composed of either supportive or competitive relationships and either with individual or team incentives for attending exercise classes. The social comparison condition placed participants into 6-person competitive networks with individual incentives. The social support condition placed participants into 6-person teams with team incentives. The combined condition with both supportive and competitive relationships placed participants into 6-person teams, where participants could compare their team’s performance to 5 other teams' performances. The control condition only allowed participants to attend classes with individual incentives. Rewards were based on the total number of classes attended by an individual, or the average number of classes attended by the members of a team. The outcome was the number of classes that participants attended. Data were analyzed using multilevel models in 2014. The mean attendance numbers per week were 35.7, 38.5, 20.3, and 16.8 in the social comparison, the combined, the control, and the social support conditions. Attendance numbers were 90% higher in the social comparison and the combined conditions (mean = 1.9, SE = 0.2) in contrast to the two conditions without comparison (mean = 1.0, SE = 0.2) (p = 0.003). Social comparison was more effective for increasing physical activity than social support and its effects did not depend on individual or team incentives.

Concepts: Comparison, Randomized controlled trial, Arithmetic mean, Average, Randomness, Control, Grammatical number, The A-Team

214

The interaction between language and motor action has been approached by studying the effect of action verbs, kinaesthetic imagery and mental subtraction upon the performance of a complex movement, the squat vertical jump (SVJ). The time of flight gave the value of the height of the SVJ and was measured with an Optojump® and a Myotest® apparatuses. The results obtained by the effects of the cognitive stimuli showed a statistically significant improvement of the SVJ performance after either loudly or silently pronouncing, hearing or reading the verb saute (jump in French language). Action verbs specific for other motor actions (pince = pinch, lèche = lick) or non-specific (bouge = move) showed no or little effect. A meaningless verb for the French subjects (tiáo = jump in Chinese) showed no effect as did rêve (dream), tombe (fall) and stop. The verb gagne (win) improved significantly the SVJ height, as did its antonym perds (lose) suggesting a possible influence of affects in the subjects' performance. The effect of the specific action verb jump upon the heights of SVJ was similar to that obtained after kinaesthetic imagery and after mental subtraction of two digits numbers from three digits ones; possibly, in the latter, because of the intervention of language in calculus. It appears that the effects of the specific action verb jump did seem effective but not totally exclusive for the enhancement of the SVJ performance. The results imply an interaction among language and motor brain areas in the performance of a complex movement resulting in a clear specificity of the corresponding action verb. The effect upon performance may probably be influenced by the subjects' intention, increased attention and emotion produced by cognitive stimuli among which action verbs.

Concepts: Spanish language, Word, Verb, Romance languages, Grammatical number, Grammatical tense

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Hybrid Open Access is an intermediate form of OA, where authors pay scholarly publishers to make articles freely accessible within journals, in which reading the content otherwise requires a subscription or pay-per-view. Major scholarly publishers have in recent years started providing the hybrid option for the vast majority of their journals. Since the uptake usually has been low per journal and scattered over thousands of journals, it has been very difficult to obtain an overview of how common hybrid articles are. This study, using the results of earlier studies as well as a variety of methods, measures the evolution of hybrid OA over time. The number of journals offering the hybrid option has increased from around 2,000 in 2009 to almost 10,000 in 2016. The number of individual articles has in the same period grown from an estimated 8,000 in 2009 to 45,000 in 2016. The growth in article numbers has clearly increased since 2014, after some major research funders in Europe started to introduce new centralized payment schemes for the article processing charges (APCs).

Concepts: Mathematics, Number, Payment, Hybrid, The UpTake, Grammatical number

34

In this study we investigate the effect of age of acquisition (AoA) on grammatical processing in second language learners as measured by event-related brain potentials (ERPs). We compare a traditional analysis involving the calculation of averages across a certain time window of the ERP waveform, analyzed with categorical groups (early vs. late), with a generalized additive modeling analysis, which allows us to take into account the full range of variability in both AoA and time. Sixty-six Slavic advanced learners of German listened to German sentences with correct and incorrect use of non-finite verbs and grammatical gender agreement. We show that the ERP signal depends on the AoA of the learner, as well as on the regularity of the structure under investigation. For gender agreement, a gradual change in processing strategies can be shown that varies by AoA, with younger learners showing a P600 and older learners showing a posterior negativity. For verb agreement, all learners show a P600 effect, irrespective of AoA. Based on their behavioral responses in an offline grammaticality judgment task, we argue that the late learners resort to computationally less efficient processing strategies when confronted with (lexically determined) syntactic constructions different from the L1. In addition, this study highlights the insights the explicit focus on the time course of the ERP signal in our analysis framework can offer compared to the traditional analysis.

Concepts: Grammar, English language, Event-related potential, Inflection, Syntax, Grammatical number, Grammatical conjugation, Grammatical gender

28

A new strain of yellow-green algae (Xanthophyceae, Heterokonta), tentatively named Heterococcus sp. DN1 (UTEX accession number UTEX ZZ885), was discovered among snow fields in the Rocky Mountains. Axenic cultures of H. sp. DN1 were isolated and their cellular morphology, growth, and composition of lipids were characterized. H. sp. DN1 was found to grow at temperatures approaching freezing and to accumulate large intracellular stores of lipids. H. sp. DN1 produces the highest quantity of lipids when grown undisturbed with high light in low temperatures. Of particular interest was the accumulation of eicosapentaenoic acid (EPA), known to be important for human nutrition, and palmitoleic acid (PA), known to improve biodiesel feedstock properties. © 2013 American Institute of Chemical Engineers Biotechnol. Prog., 2013.

Concepts: Algae, Fatty acid, Omega-3 fatty acid, Eicosapentaenoic acid, Colorado, Grammatical number, Algae fuel, Cryptomonad

28

Catastrophizing is an exaggerated negative evaluation and attention to specific symptoms such as pain or fatigue. A number of studies consistently support the significant role of catastrophizing in pain. However, the role of catastrophizing in fatigue is less frequently investigated. This article provides a critical review of published studies investigating this association.

Concepts: Symptom, Fatigue, Post-concussion syndrome, Critical path method, Grammatical number, Article

28

Background: Concha bullosa is the pneumatisation of intranasal conchae (usually the middle turbinate, and rarely the inferior or superior turbinate); however, the term is generally used to describe aeration of the middle concha. Superior concha bullosa is a rare finding, and only a few cases of inferior concha bullosa have been reported in the medical literature. When symptomatic, concha bullosa may cause various problems including nasal congestion, headache, postnasal drip, anosmia and, sometimes, epiphora. Methodology: Computed tomography, following history-taking and physical examination, is a valuable tool in diagnosing turbinate pneumatisation. This article presents a very rare case with bilateral triple conchae pneumatisations. Results: The symptomatology, diagnosis and treatment options for cases of multiple concha bullosa are discussed. The surgical interventions performed in the presented case are briefly described. Conclusion: The presented patient had pneumatisation of all six turbinates. In such cases, we propose that this condition be termed ‘conchae bullosis’ rather than ‘conchae bullosa’, in a similar fashion to the use of nasal polyposis as the plural form of nasal polyp.

Concepts: Sinusitis, Medical imaging, English language, Case, Physical examination, Medical history, Concha bullosa, Grammatical number

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Presence of sialic acid distinguishes gangliosides from other glycosphingolipids, helps maintain membrane structure and organization as well as acts as anchors for lectins, toxins and pathogens. The number and position of the sialic acid residues on gangliosides appear to influence the binding affinity and specificity of gangliosides. We have investigated the dependence of bicellar properties on sialic acids using Monosialo1 (GM1), Disialo1b (GD1b) and Trisialo1a (GT1a) gangliosides incorporated in phospholipid bicelles. TEM, AFM and DLS show that increasing numbers of sialic acid moieties per ganglioside results in an increase in bicelle size. DPH fluorescence anisotropy results suggest that with incorporation of gangliosides in bicelles the orientational order of the hydrocarbon chains increases. Fluorescence anisotropy was used to explore the effect of gangliosides on lateral phase separation in ganglioside enriched bicelles. GM1 and GT1a exhibited a low Tm melting domain (DMPC rich) and a high Tm melting domain (ganglioside rich). For GD1b containing bicelles, no significant phase separation was observed, suggesting a single homogeneous phase. Symmetric and antisymmetric stretching vibrational bands of methylene shift to a lower wave number, implying acyl chain order decreasing as GT1a≪GM1

Concepts: Cell membrane, Sialic acid, Wave, Glycoprotein, Ganglioside, Grammatical number, Cholera toxin, GM1

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Focal atrial tachycardias arise preferentially from specific locations within the atria. Careful analysis of the P wave can provide useful information about the chamber and likely site of origin within that chamber. Macro-reentrant atrial flutter also tends to occur over a limited number of potential circuits. In this case, the ECG usually gives a guide to the chamber of origin, but unless it shows a specific morphology it is less useful in delineating the circuit involved. Nonetheless, prior knowledge of the likely chamber of origin helps to plan the ablation strategy.

Concepts: Atrial fibrillation, Supraventricular tachycardia, Atrial flutter, Circuit, The Circuit, Grammatical number, The Chamber