bluuebunny/crossref_metadata_2025_split huggingface dataset:
The principle of inverse effectiveness in audiovisual speech perception
Authors: van de Rijt Luuk P.H. , Roye Anja , Mylanus Emmanuel A.M. , Opstal A. John van , van Wanrooij Marc M. 
Published: March 2019

AbstractWe assessed how synchronous speech listening and lip reading affects speech recognition in acoustic noise. In simple audiovisual perceptual tasks, inverse effectiveness is often observed, which holds that the weaker the unimodal stimuli, or the poorer their signal-to-noise ratio, the stronger the audiovisual benefit. So far, however, inverse effectiveness has not been demonstrated for complex audiovisual speech stimuli. Here we assess whether this multisensory integration effect can also be observed for the recognizability of spoken words.To that end, we presented audiovisual sentences to 18 native-Dutch normal-hearing participants, who had to identify the spoken words from a finite list. Speech-recognition performance was determined for auditory-only, visual-only (lipreading) and auditory-visual conditions. To modulate acoustic task difficulty, we systematically varied the auditory signal-to-noise ratio. In line with a commonly-observed multisensory enhancement on speech recognition, audiovisual words were more easily recognized than auditory-only words (recognition thresholds of −15 dB and −12 dB, respectively).We here show that the difficulty of recognizing a particular word, either acoustically or visually, determines the occurrence of inverse effectiveness in audiovisual word integration. Thus, words that are better heard or recognized through lipreading, benefit less from bimodal presentation.Audiovisual performance at the lowest acoustic signal-to-noise ratios (45%) fell below the visual recognition rates (60%), reflecting an actual deterioration of lipreading in the presence of excessive acoustic noise. This suggests that the brain may adopt a strategy in which attention has to be divided between listening and lip reading.
Comparing self- and hetero-metacognition in the absence of verbal communication
Authors: Vuillaume Laurène , Martin Jean-Rémy , Sackur Jérôme , Cleeremans Axel 
Published: March 2019

ABSTRACTThe ability to infer how confident other people are in their decisions is crucial for regulating social interactions. It is unclear whether one can read others’ confidence in absence of verbal communication and whether one can infer it as accurately as for one’s own confidence. To address these questions, we used an auditory task in which participants had to guess the confidence of someone else performing the task or to judge their own confidence in different conditions (i.e., while performing the task themselves or while watching themselves performing the task on a pre-recorded video). Results show that participants are able to guess the confidence of other people as accurately as when judging their own. Crucially, we show that hetero-metacognition is a flexible mechanism relying on different cues according to the context. Our results support the idea that metacognition leverages the same inference mechanisms as involved in theory of mind.
Combined morphological and transcriptomic analyses reveal genetic regulation underlying the species-specific bulbil outgrowth in Dioscorea alata L
Authors: Wu Zhi-Gang , Jiang Wu , Tao Zheng-Ming , Guo Xiu-Zhu , Pan Xiao-Jun , Yu Wen-Hui 
Published: March 2019

AbstractIn yam (Dioscorea spp) species, bulbil at leaf axils is the most striking species-specific axillary structure and exhibits important ecological niches as well as crop yields. Genetic regulation underlying bulbil outgrowth remain largely unclear. We here first characterized the development of bulbil from Dioscorea alata L. using histological analysis and further performed full transcriptional profiling on its key developmental stages. Comprehensive mRNA analyses suggested that long-distance phytohormone signals including auxin, CK and ABA, play critical roles in controlling the initiation of bulbil through coordinately altering expression levels of genes involved in localized hormone metabolism and transport. Sucrose functioned as a novel signal and was required strongly at the early stage of bulbil formation, thus promoting its outgrowth through up-regulating trehalose-6-phophate pathway. GO pathway analysis demonstrated that genes are enriched in biological processes related to light stimuli, cell division, cell wall modification and carbohydrate metabolism. Particularly, some novel genes including dioscorin A/B, starch synthetic enzymes and chitinases showed remarkably high expression levels and strengthened the outgrowth of bulbil. Our data set demonstrated that the initiation of bulbil was highly regulated by a large number of transcriptional regulators. RNA in situ hybridization with MYB, WRKY and NAC transcription factors confirmed their key roles in triggering bulbil initiation. Together, our findings provide a crucial angle for genetic regulation of controlling the unique reproductive development of bulbils. Transcriptome data set can serve as a valuable genomic resource for yam research community or further genetic manipulation to improve bulbil yields.HighlightTranscriptomic data identified multiple functional genes and regulators; long-distance signals (auxin, CK, ABA), and sucrose as a novel signal play critical roles in controlling bulbil outgrowth.
Trans-Endothelial Insulin Transport is Impaired in Skeletal Muscle Capillaries of Obese Male Mice
Authors: Williams Ian M , McClatchey P Mason , Bracy Deanna P , Bonner Jeffrey S , Valenzuela Francisco A , Wasserman David H 
Published: March 2019

ABSTRACTDelivery of insulin to the surface of myocytes is required for skeletal muscle (SkM) insulin action. Previous studies have shown that SkM insulin delivery is reduced in the setting of obesity and insulin resistance (IR). The key variables that control SkM insulin delivery are 1) microvascular perfusion and 2) the rate at which insulin moves across the continuous endothelium of SkM capillaries. Obesity and IR are associated with reduced insulin-stimulated SkM perfusion. Whether an impairment in trans-endothelial insulin transport (EIT) contributes to SkM IR, however, is unknown. We hypothesized that EIT would be delayed in a mouse model of diet-induced obesity (DIO) and IR. Using intravital insulin imaging, we found that DIO male mice have a ~15% reduction in EIT compared to their lean counterparts. This impairment in EIT is associated with a 45% reduction in the density of endothelial vesicles. Despite impaired EIT, hyperinsulinemia sustained delivery of insulin to the interstitial space in DIO male mice. Even with maintained interstitial insulin delivery DIO male mice still showed SkM IR, indicating severe myocyellular IR in this model. Interestingly, there was no difference in EIT, endothelial ultrastructure or SkM insulin sensitivity between lean and high fat diet-fed female mice. These results suggest that, in male mice, obesity results in damage to the capillary endothelium which limits the capacity for EIT.
A peptide of a type I toxin-antitoxin system induces Helicobacter pylori morphological transformation from spiral-shape to coccoids
Authors: Mortaji Lamya El , Tejada-Arranz Alejandro , Rifflet Aline , Boneca Ivo G , Pehau-Arnaudet Gérard , Radicella J. Pablo , Marsin Stéphanie , De Reuse Hilde 
Published: March 2019

SummaryToxin-antitoxin systems are found in many bacterial chromosomes and plasmids with roles ranging from plasmid stabilization to biofilm formation and persistence. In these systems, the expression/activity of the toxin is counteracted by an antitoxin, which in type I systems is an antisense-RNA. While the regulatory mechanisms of these systems are mostly well-defined, the toxins’ biological activity and expression conditions are less understood. Here, these questions were investigated for a type I toxin-antitoxin system (AapA1-IsoA1) expressed from the chromosome of the human pathogen Helicobacter pylori. We show that expression of the AapA1 toxin in H. pylori causes growth arrest associated with rapid morphological transformation from spiral-shaped bacteria to round coccoid cells. Coccoids are observed in patients and during in vitro growth as a response to different stress conditions. The AapA1 toxin, first molecular effector of coccoids to be identified, targets H. pylori inner membrane without disrupting it, as visualized by Cryo-EM. The peptidoglycan composition of coccoids is modified with respect to spiral bacteria. No major changes in membrane potential or ATP concentration result from AapA1 expression, suggesting coccoid viability. Single-cell live microscopy tracking the shape conversion suggests a possible association of this process with cell elongation/division interference. Oxidative stress induces coccoid formation and is associated with repression of the antitoxin promoter and enhanced processing of its transcript, leading to an imbalance in favor of AapA1 toxin expression.Our data support the hypothesis of viable coccoids with characteristics of dormant bacteria that might be important in H. pylori infections refractory to treatment.Significance StatementHelicobacter pylori, a gastric pathogen causing 800,000 deaths in the world annually, is encountered both in vitro and in patients as spiral-shaped bacteria and as round cells named coccoids. We discovered that the toxin from a chromosomal type I toxin-antitoxin system is targeting H. pylori membrane and acting as an effector of H. pylori morphological conversion to coccoids. We showed that these round cells maintain their membrane integrity and metabolism, strongly suggesting that they are viable dormant bacteria. Oxidative stress was identified as a signal inducing toxin expression and coccoid formation. Our findings reveal new insights into a form of dormancy of this bacterium that might be associated with H. pylori infections refractory to treatment.
3.1Å structure of yeast RNA polymerase II elongation complex stalled at a cyclobutane pyrimidine dimer lesion solved using streptavidin affinity grids
Authors: Lahiri Indrajit , Xu Jun , Han Bong Gyoon , Oh Juntaek , Wang Dong , DiMaio Frank , Leschziner Andres E 
Published: March 2019

AbstractDespite significant advances in all aspects of single particle cryo-electron microscopy (cryo-EM), specimen preparation still remains a challenge. During sample preparation, macromolecules interact with the air-water interface, which often leads to detrimental effects such as denaturation or adoption of preferred orientations, ultimately hindering structure determination. Randomly biotinylating the protein of interest and then tethering it to a cryo-EM grid coated with two-dimensional crystals of streptavidin (acting as an affinity surface) can prevent the protein from interacting with the air-water interface. Recently, this approach was successfully used to solve a high-resolution structure of a test sample, a bacterial ribosome. However, the general applicability of this method to samples where interaction with the air-water interface is problematic remains to be determined. Here we report a 3.1Å structure of a RNA polymerase II elongation complex stalled at a cyclobutane pyrimidine dimer lesion (Pol II EC(CPD)) solved using streptavidin grids. Our previous attempt to solve this structure using conventional sample preparation methods resulted in a poor quality cryo-EM map due to Pol II EC(CPD)’s adopting a strong preferred orientation. Imaging the same sample on streptavidin grids led to a high-resolution structure with little anisotropy, showing that streptavidin affinity grids could be used as a general strategy to address challenges posed by interaction with the air-water interface.
PFA ependymoma-associated protein EZHIP inhibits PRC2 activity through a H3 K27M-like mechanism
Authors: Jain Siddhant U. , Do Truman J. , Lund Peder J. , Rashoff Andrew Q. , Cieslik Marcin , Diehl Katharine L. , Bajic Andrea , Juretic Nikoleta , Deshmukh Shriya , Venneti Sriram , Muir Tom W , Garcia Benjamin A. , Jabado Nada , Lewis Peter W. 
Published: March 2019

ABSTRACTPolycomb group (PcG) proteins are essential for development and are frequently misregulated in human cancers. Polycomb Repressive Complexes (PRC1, PRC2) function in a collaborative epigenetic cross-talk with H3K27me3 to initiate and maintain transcriptional silencing. Diffuse intrinsic pontine gliomas (DIPGs) have extremely low H3K27me3 levels mediated by H3 K27M oncohistone. Posterior fossa type A (PFA) ependymomas also exhibit very low H3K27 methylation but lack the K27M oncohistone. Instead, PFA tumors express high levels of EZHIP (Enhancer of Zeste Homologs Inhibitory Protein, also termed CXORF67). We find that a highly conserved sequence within the C-terminus of EZHIP is necessary and sufficient to inhibit the catalytic activity of PRC2 in vitro and in vivo. Our biochemical experiments indicate that EZHIP directly interacts with the active site of the EZH2 subunit in a mechanism that is remarkably similar to the K27M oncohistone. Furthermore, expression of H3 K27M or EZHIP in cells promote similar chromatin profiles: loss of broad H3K27me3 domains, but retention of H3K27me3 at the sites of PRC2 recruitment. Importantly, we find that H3K27me3-mediated allosteric activation of PRC2 substantially increases the inhibition potential of EZHIP and H3 K27M, providing a potential mechanism for loss of H3K27me3 spreading from CpG islands in vivo. Our data indicate that PFA ependymoma and DIPG are driven in part by the action of peptidyl PRC2 inhibitors– the K27M oncohistone and the EZHIP ‘oncohistone-mimic’– that dysregulate gene silencing to promote tumorigenesis.
Division and adaptation to host nutritional environment of apicomplexan parasites depend on apicoplast lipid metabolic plasticity and host organelles remodelling
Authors: Amiar Souad , Katris Nicholas J. , Berry Laurence , Dass Sheena , Shears Melanie J. , Brunet Camille , Touquet Bastien , Hakimi Mohamed-Ali , McFadden Geoffrey I. , Yamaryo-Botté Yoshiki , Botté Cyrille Y. 
Published: March 2019

AbstractApicomplexan parasites are unicellular eukaryotes responsible for major human diseases including malaria and toxoplasmosis. Apicomplexan parasites must obtain and combine lipids both from host cell scavenging andde novosynthesis to maintain parasite propagation and survival within their human host. Major questions on the actual role for each lipid source or how these are regulated upon fluctuating host nutritional conditions remain unanswered. Characterization of an apicoplast acyltransferase TgATS2, shows that the apicoplast provides local (lyso)phosphatidic acid balance, which is required for the recruitment of a novel dynamin (TgDrpC) critical during parasite cytokinesis. Disruption of TgATS2 led parasites to shift metabolic lipid acquisition fromde novosynthesis towards host scavenging. Importantly, both lipid scavenging andde novosynthesis pathways exhibit major metabolic and cellular plasticity upon sensing host lipid-deprived environments through concomitant (i) up-regulation ofde novofatty acid synthesis capacities in the apicoplast, and (ii) parasite-driven host cell remodelling to generate multi-membrane-bound structures from host organelles that are imported towards the parasite.
Tamoxifen Suppresses Pancreatic β-Cell Proliferation in Mice
Authors: Ahn Surl-Hee , Granger Anne , Rankin Matthew M. , Lam Carol J. , Cox Aaron R. , Kushner Jake A. 
Published: March 2019

ABSTRACTTamoxifen is a mixed agonist/antagonist estrogen analogue that is frequently used to induce conditional gene deletion in mice using Cre-loxP mediated gene recombination. Tamoxifen is routinely employed in extremely high-doses relative to typical human doses to induce efficient gene deletion in mice. Although tamoxifen has been widely assumed to have no influence upon β-cells, the acute developmental and functional consequences of high-dose tamoxifen upon glucose homeostasis and adult β-cells are largely unknown. We tested if tamoxifen influences glucose homeostasis in male mice of various genetic backgrounds. We then carried out detailed histomorphometry studies of mouse pancreata. We also performed gene expression studies with islets of tamoxifen-treated mice and controls. Tamoxifen had modest effects upon glucose homeostasis of mixed genetic background (F1 B6129SF1/J) mice, with fasting hyperglycemia and improved glucose tolerance but without overt effects on fed glucose levels or insulin sensitivity. Tamoxifen inhibited proliferation of β-cells in a dose-dependent manner, with dramatic reductions in β-cell turnover at the highest dose (decreased by 66%). In sharp contrast, tamoxifen did not reduce proliferation of pancreatic acinar cells. β-cell proliferation was unchanged by tamoxifen in 129S2 mice but was reduced in C57Bl6 genetic background mice (decreased by 59%). Gene expression studies revealed suppression of RNA for cyclins D1 and D2 within islets of tamoxifen-treated mice. Tamoxifen has a cytostatic effect on β-cells, independent of changes in glucose homeostasis, in mixed genetic background and also in C57Bl6 mice. Tamoxifen should be used judiciously to inducibly inactivate genes in studies of glucose homeostasis.
Mobile Phone Based Strategies for Preconception Education in Rural Africa
Authors: Kassa Zemenu Yohannes , Tenaw Zelalem , Astatkie Ayalew , Siyoum Melese , Bekele Gezahegn , Taye Kefyalew , Mekonnen Shewangizaw , Kassaye Zerai 
Published: March 2019

AbstractBackgroundprepregnancy health care is vital to alleviate and prevent maternal and neonatal disability and death.ObjectiveThe purpose of the study was to measure the levels of knowledge and attitude on preconception care and their determinants among women who delivered at government hospitals in a rural setting in southern Ethiopia.MethodA facility-based cross sectional study was done from January 01 to February 30, 2017 on a sample of 370 women who delivered at government hospitals in Wolayita zone. The mothers were selected using systematic random sampling. The data were collected using structured and pretested interviewer administered questionnaires at the postnatal ward of each hospital. Data were analyzed using bivariate and multivariable techniques.ResultsThe result showed that 53% (95% confidence interval [CI]: 47.8%, 58.1%) of mothers who delivered at public hospitals had adequate level of knowledge on preconception care, whereas 54.3% (95% CI: 49.2%, 59.5%) possessed positive attitude to preconception care. Mothers who have radio, planned pregnancy and have participated in community meetings related to preconception care had a meaningfully higher odds of good level of knowledge to preconception care. Ordinal regression showed that women who own mobile phone had at least three times significantly higher odds of positive attitude to preconception care, whereas women who have participated community meetings had lower odds of positive attitude on preconception care.ConclusionThe results revealed that the levels of mothers’ knowledge and positive attitude on preconception care are low relative to other studies. Using transistor radio and mobile phone have significant effect in improving the knowledge and attitude of reproductive age women on preconception care. Hence, providing community health education based on radio and/or mobile phone messaging could be useful in positively influencing the knowledge and attitude of women on preconception care.
Genetic and antigenic variation of foot-and-mouth disease virus during persistent infection in naturally infected cattle and Asian buffalo in India
Authors: Biswa Jitendra K. , Ranjan Rajeev , Subramaniam Saravanan , Mohapatra Jajati K. , Patidar Sanjay , Sharma Mukesh K. , Bertram Miranda R. , Brito Barbara , Rodriguez Luis L. , Pattnaik Bramhadev , Arzt Jonathan 
Published: March 2019

AbstractThe role of foot-and-mouth disease virus (FMDV) persistently infected ruminants in initiating new outbreaks remains controversial, and the perceived threat posed by such animals hinders international trade in FMD-endemic countries. In this study we report longitudinal analyses of genetic and antigenic variations of FMDV serotype O/ME-SA/Ind2001d sublineage during naturally occurring, persistent infection in cattle and buffalo at an organised dairy farm in India. The proportion of animals from which FMDV RNA was recovered was not significantly different between convalescent (post-clinical) and sub-clinically infected animals or between cattle and buffalo across the sampling period. However, infectious virus was isolated from a higher proportion of buffalo samples and for a longer duration compared to cattle. Analysis of the P1 sequences from recovered viruses indicated fixation of mutations at the rate of 1.816 × 10-2substitution/site/year (s/s/y) (95% CI 1.362-2.31 × 10-2s/s/y). However, the majority of point mutations were transitional substitutions. Within individual animals, the mean dN/dS (ω) value for the P1 region varied from 0.076 to 0.357, suggesting the selection pressure acting on viral genomes differed substantially across individual animals. Statistical parsimony analysis indicated that all of the virus isolates from carrier animals originated from the outbreak virus. The antigenic relationship value as determined by 2D-VNT assay revealed fluctuation of antigenic variants within and between carrier animals during the carrier state which suggested that some carrier viruses had diverged substantially from the protection provided by the vaccine strain. This study contributes to understanding the extent of within-host and within-herd evolution that occurs during the carrier state of FMDV.
Grant reviewer perceptions of the quality and effectiveness of panel discussion
Authors: Gallo Stephen A. , Schmaling Karen B. , Thompson Lisa A. , Glisson Scott R. 
Published: March 2019

AbstractBackgroundFunding agencies have long used panel discussion in the peer review of research grant proposals as a way to utilize a set of expertise and perspectives in making funding decisions. Little research has examined the quality of panel discussions and how effectively they are facilitated.MethodsHere we present a mixed-method analysis of data from a survey of reviewers focused on their perceptions of the quality and facilitation of panel discussion from their last peer review experience.ResultsReviewers indicated that panel discussions were viewed favorably in terms of participation, clarifying differing opinions, informing unassigned reviewers, and chair facilitation. However, some reviewers mentioned issues with panel discussions, including an uneven focus, limited participation from unassigned reviewers, and short discussion times. Most reviewers felt the discussions affected the review outcome, helped in choosing the best science, and were generally fair and balanced. However, those who felt the discussion did not affect the outcome were also more likely to evaluate panel communication negatively, and several reviewers mentioned potential sources of bias related to the discussion. While respondents strongly acknowledged the importance of the chair in ensuring appropriate facilitation of the discussion to influence scoring and to limit the influence of potential sources of bias from the discussion on scoring, nearly a third of respondents did not find the chair of their most recent panel to have performed these roles effectively.ConclusionsIt is likely that improving chair training in the management of discussion as well as creating review procedures that are informed by the science of leadership and team communication would improve review processes and proposal review reliability.