bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantum spin Hall insulators in centrosymmetric thin films composed from topologically trivial BiTeI trilayers
Authors: Nechaev I. A. , Eremeev S. V. , Krasovskii E. E. , Echenique P. M. , Chulkov E. V. 
Published: March 2017

AbstractThe quantum spin Hall insulators predicted ten years ago and now experimentally observed are instrumental for a break- through in nanoelectronics due to non-dissipative spin-polarized electron transport through their edges. For this transport to persist at normal conditions, the insulators should possess a sufficiently large band gap in a stable topological phase. Here, we theoretically show that quantum spin Hall insulators can be realized in ultra-thin films constructed from a trivial band insulator with strong spin-orbit coupling. The thinnest film with an inverted gap large enough for practical applications is a centrosymmetric sextuple layer built out of two inversely stacked non-centrosymmetric BiTeI trilayers. This nontrivial sextuple layer turns out to be the structure element of an artificially designed strong three-dimensional topological insulator Bi2Te2I2. We reveal general principles of how a topological insulator can be composed from the structure elements of the BiTeX family (X = I, Br, Cl), which opens new perspectives towards engineering of topological phases.
An antimicrobial peptide-resistant minor subpopulation of Photorhabdus luminescens is responsible for virulence
Authors: Mouammine Annabelle , Pages Sylvie , Lanois Anne , Gaudriault Sophie , Jubelin Gregory , Bonabaud Maurine , Cruveiller Stéphane , Dubois Emeric , Roche David , Legrand Ludovic , Brillard Julien , Givaudan Alain 
Published: March 2017

AbstractSome of the bacterial cells in isogenic populations behave differently from others. We describe here how a new type of phenotypic heterogeneity relating to resistance to cationic antimicrobial peptides (CAMPs) is determinant for the pathogenic infection process of the entomopathogenic bacteriumPhotorhabdus luminescens. We demonstrate that the resistant subpopulation, which accounts for only 0.5% of the wild-type population, causes septicemia in insects. Bacterial heterogeneity is driven by the PhoPQ two-component regulatory system and expression ofpbgPE,an operon encoding proteins involved in lipopolysaccharide (LPS) modifications. We also report the characterization of a core regulon controlled by the DNA-binding PhoP protein, which governs virulence inP. luminescens. Comparative RNAseq analysis revealed an upregulation of marker genes for resistance, virulence and bacterial antagonism in the pre-existing resistant subpopulation, suggesting a greater ability to infect insect prey and to survive in cadavers. Finally, we suggest that the infection process ofP. luminescensis based on a bet-hedging strategy to cope with the diverse environmental conditions experienced during the lifecycle.
Associations of obesity with newly diagnosed and previously known atopic diseases in Chinese adults: a case-control study
Authors: Xie Biao , Wang Zhiqiang , Wang Yupeng , Liu Meina , Wang Yongchen 
Published: March 2017

AbstractTo assess the associations of obesity with newly diagnosed and previously known atopic disorders in Chinese adults. 4,629 adults aged 18 years or older were recruited in Harbin, China. Among them, 1,114 were previously diagnosed atopic cases, 1,298 were newly diagnosed cases, and 2,217 non-atopic controls. Obesity and overweight are defined according to the criteria established by the Working Group on Obesity in China. The associations of obesity with known and newly diagnosed atopic disorders were assessed using logistic regressions. Obesity was significantly associated with known atopic disorders (adjusted OR = 2.41 (95% CI: 1.81, 3.22)). The association of obesity with newly diagnosed atopic cases was not as strong as that with known cases, and was not statistically significant (adjusted OR = 1.27 (95% CI: 0.94, 1.72)). The similar pattern was observed in different allergic diseases, gender and age stratifications. The association between overweight and atopic diseases were not significant. Obesity is strongly associated with previously diagnosed atopic cases but not so with newly diagnosed atopic cases in Chinese adults. It is likely that people with atopic disorders have a higher risk of developing obesity. Our findings are important for the management of atopic disorders and chronic disease prevention among atopic disease patients.
Identification of serum protein biomarkers for utrophin based DMD therapy
Authors: Guiraud Simon , Edwards Benjamin , Squire Sarah E. , Babbs Arran , Shah Nandini , Berg Adam , Chen Huijia , Davies Kay E. 
Published: March 2017

AbstractDespite promising therapeutic avenues, there is currently no effective treatment for Duchenne muscular dystrophy (DMD), a lethal monogenic disorder caused by the loss of the large cytoskeletal protein, dystrophin. A highly promising approach to therapy, applicable to all DMD patients irrespective to their genetic defect, is to modulate utrophin, a functional paralogue of dystrophin, able to compensate for the primary defects of DMD restoring sarcolemmal stability. One of the major difficulties in assessing the effectiveness of therapeutic strategies is to define appropriate outcome measures. In the present study, we utilised an aptamer based proteomics approach to profile 1,310 proteins in plasma of wild-type, mdx and Fiona (mdx overexpressing utrophin) mice. Comparison of the C57 and mdx sera revealed 83 proteins with statistically significant >2 fold changes in dystrophic serum abundance. A large majority of previously described biomarkers (ANP32B, THBS4, CAMK2A/B/D, CYCS, CAPNI) were normalised towards wild-type levels in Fiona animals. This work also identified potential mdx markers specific to increased utrophin (DUS3, TPI1) and highlights novel mdx biomarkers (GITR, MYBPC1, HSP60, SIRT2, SMAD3, CNTN1). We define a panel of putative protein mdx biomarkers to evaluate utrophin based strategies which may help to accelerate their translation to the clinic.
Understanding surface structure and chemistry of single crystal lanthanum aluminate
Authors: Pramana Stevin S. , Cavallaro Andrea , Qi Jiahui , Nicklin Chris L. , Ryan Mary P. , Skinner Stephen J. 
Published: March 2017

AbstractThe surface crystallography and chemistry of a LaAlO3single crystal, a material mainly used as a substrate to deposit technologically important thin films (e.g. for superconducting and magnetic devices), was analysed using surface X-ray diffraction and low energy ion scattering spectroscopy. The surface was determined to be terminated by Al-O species, and was significantly different from the idealised bulk structure. Termination reversal was not observed at higher temperature (600 °C) and chamber pressure of 10−10 Torr, but rather an increased Al-O occupancy occurred, which was accompanied by a larger outwards relaxation of Al from the bulk positions. Changing the oxygen pressure to 10−6 Torr enriched the Al site occupancy fraction at the outermost surface from 0.245(10) to 0.325(9). In contrast the LaO, which is located at the next sub-surface atomic layer, showed no chemical enrichment and the structural relaxation was lower than for the top AlO2layer. Knowledge of the surface structure will aid the understanding of how and which type of interface will be formed when LaAlO3is used as a substrate as a function of temperature and pressure, and so lead to improved design of device structures.
Bioresources inner-recycling between bioflocculation of Microcystis aeruginosa and its reutilization as a substrate for bioflocculant production
Authors: Xu Liang , Huo Mingxin , Sun Caiyun , Cui Xiaochun , Zhou Dandan , Crittenden John C. , Yang Wu 
Published: March 2017

AbstractBioflocculation, being environmental-friendly and highly efficient, is considered to be a promising method to harvest microalgae. However, one limitation of this technology is high expense on substrates for bioflocculant bacteria cultivation. In this regard, we developed an innovative method for the inner-recycling of biomass that could harvest the typical microalgae, Microcystis aeruginosa, using a bioflocculant produced by Citrobacter sp. AzoR-1. In turn, the flocculated algal biomass could be reutilized as a substrate for Citrobacter sp. AzoR-1 cultivation and bioflocculant production. The experimental results showed that 3.4 ± 0.1 g of bioflocculant (hereafter called MBF-12) was produced by 10 g/L of wet biomass of M. aeruginosa (high-pressure steam sterilized) with an additional 10 g/L of glucose as an extra carbon source. The efficiency of MBF-12 for M. aeruginosa harvesting could reach ~95% under the optimized condition. Further analysis showed that MBF-12, dominated by ~270 kDa biopolymers, contributed the bioflocculation mechanisms of interparticle bridging and biosorption process. Bioflocculant synthesis by Citrobacter sp. AzoR-1 using microalga as a substrate, including the polyketide sugar unit, lipopolysaccharide, peptidoglycan and terpenoid backbone pathways. Our research provides the first evidence that harvested algae can be reutilized as a substrate to grow a bioflocculant using Citrobacter sp. AzoR-1.
Rhein Inhibits Autophagy in Rat Renal Tubular Cells by Regulation of AMPK/mTOR Signaling
Authors: Tu Yue , Gu Liubao , Chen Diping , Wu Wei , Liu Hong , Hu Hao , Wan Yigang , Sun Wei 
Published: March 2017

AbstractRhubarb and its bioactive component rhein are frequently used for the treatment of chronic kidney diseases (CKD) in eastern Asia countries. However, the potential therapeutic mechanism remains unclear. Autophagy plays an important role in CKD. However, there were some important related issues that remained unresolved in the role of autophagy in CKD and treatment by rhubarb and rhein. We designed a number of experiments to examine whether rhubarb may reduce renal fibrosis and autophagy in rats with adenine (Ade)-induced renal tubular injury, and whether rhein could affect autophagic pathways in rat renal tubular cells. We found that, autophagic activation accompanied with renal fibrosis in rats with Ade-induced renal tubular injury, and both autophagy and renal fibrosis were attenuated by rhubarb. In addition, we observed that rhein could inhibit autophagy through regulating the key molecules in the AMPK-dependent mTOR signaling pathways, as well as the Erk and p38 MAPKs signaling pathways. These findings may partly explain the therapeutic mechanisms of rhubarb and rhein in treating CKD patients in clinic, and further suggest that targeting autophagy and related signaling pathways may provide new strategies for the treatment of renal fibrosis in CKD.
Nicotine facilitates VSMC dysfunction through a miR-200b/RhoGDIA/cytoskeleton module
Authors: Liang Dongli , Wang Zhaoxia , Yan Zhiqiang , Hou Shangwei , Xu Wangjie , Wang Lianyun , Shang Meisheng , Qiao Zhongdong 
Published: March 2017

AbstractNicotine can induce the abnormal migration and proliferation of vascular smooth muscle cells (VSMCs). We have previously shown that cytoskeletal proteins and RhoGDIA, a negative regulator of the Rho GTPase pathway, are involved in the nicotine-induced dysfunction of VSMCs. Here, we found that nicotine can activate the Rho GTPase pathway and induce the synthesis of the cytoskeletal proteins in VSMCs through the activation of intracellular downstream signaling pathways, including targets such as MYPT1, PAK1 and PI3K/AKT. Upon nicotine treatment, the mRNA level of RhoGDIA is increased but protein level is decreased both in vitro and in vivo, which suggested a mechanism of post-translational regulation. By the dual luciferase reporter assay, we identified the microRNA-200b (miR-200b) as a modulator of the behavioural changes of VSMCs in response to nicotine through targeting RhoGDIA directly. Introducing miR-200b inhibitors into cultured VSMCs significantly attenuated cell proliferation and migration. Additionally, we found that hypomethylation in the CpG island shore region of miR-200b was responsible for the nicotine-induced miR-200b up-regulation in VSMCs. The study demonstrates that nicotine facilitates VSMC dysfunction through a miR-200b/RhoGDIA/cytoskeleton module through the hypomethylation of miR-200b promoter and suggests that epigenetic modifications may play an important role in the pathological progression.
Transposon insertional mutagenesis in mice identifies human breast cancer susceptibility genes and signatures for stratification
Authors: Chen Liming , Jenjaroenpun Piroon , Pillai Andrea Mun Ching , Ivshina Anna V. , Ow Ghim Siong , Efthimios Motakis , Zhiqun Tang , Tan Tuan Zea , Lee Song-Choon , Rogers Keith , Ward Jerrold M. , Mori Seiichi , Adams David J. , Jenkins Nancy A. , Copeland Neal G. , Ban Kenneth Hon-Kim , Kuznetsov Vladimir A. , Thiery Jean Paul 
Published: March 2017

Significance
Despite concerted efforts to identify causal genes that drive breast cancer (BC) initiation and progression, we have yet to establish robust signatures to stratify patient risk. Here we used in vivo transposon-based forward genetic screening to identify potentially relevant BC driver genes. Integrating this approach with survival prediction analysis, we identified six gene pairs that could prognose human BC subtypes into high-, intermediate-, and low-risk groups with high confidence and reproducibility. Furthermore, we identified susceptibility gene sets for basal and claudin-low subtypes (21 and 16 genes, respectively) that stratify patients into three relative risk subgroups. These signatures offer valuable prognostic insight into the genetic basis of BC and allow further exploration of the interconnectedness of BC driver genes during disease progression.
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the SCK·CEN, Belgium and the BIPM in 60Co gamma radiation
Authors: Kessler C , Burns D , Mihailescu L C , Chiriotti S 
Published: March 2017

A first key comparison of the standards for air kerma of the Laboratory for Nuclear Calibrations (LNK) from the Studiecentrum voor Kernenergie—Centre d'Etude de l'Energie Nucleaire (SCK·CEN), Belgium and of the Bureau International des Poids et Mesures (BIPM) was carried out in the 60Co radiation beam of the BIPM in September 2016. The comparison result, evaluated as a ratio of the SCK·CEN and the BIPM standards for air kerma, is 1.0021 with a combined standard uncertainty of 2.6 × 10-3. The results for an indirect comparison made at the same time are consistent with the direct results at the level of 7 parts in 104. The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database.

Main text

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
A network model predicts the intensity of residue-protein thermal coupling
Authors: Censoni Luciano , dos Santos Muniz Heloisa , Martínez Leandro 
Published: March 2017

Abstract

Motivation
The flow of vibrational energy in proteins has been shown not to obey expectations for isotropic media. The existence of preferential pathways for energy transport, with probable connections to allostery mechanisms, has been repeatedly demonstrated. Here, we investigate whether, by representing a set of protein structures as networks of interacting amino acid residues, we are able to model heat diffusion and predict residue-protein vibrational couplings, as measured by the Anisotropic Thermal Diffusion (ATD) computational protocol of modified molecular dynamics simulations.

Results
We revisit the structural rationales for the precise definition of a contact between amino acid residues. Using this definition to describe a set of proteins as contact networks where each node corresponds to a residue, we show that node centrality, particularly closeness centrality and eigenvector centrality, correlates to the strength of the vibrational coupling of each residue to the rest of the structure. We then construct an analytically solvable model of heat diffusion on a network, whose solution incorporates an explicit dependence on the connectivity of the heated node, as described by a perturbed graph Laplacian Matrix.

Availability and Implementation
An implementation of the described model is available at http://leandro.iqm.unicamp.br/atd-scripts.
Long-term symptom improvement and patient satisfaction following catheter ablation of supraventricular tachycardia: insights from the German ablation registry
Authors: Brachmann Johannes , Lewalter Thorsten , Kuck Karl-Heinz , Andresen Dietrich , Willems Stephan , Spitzer Stefan G. , Straube Florian , Schumacher Burghard , Eckardt Lars , Danilovic Dejan , Thomas Dierk , Hochadel Matthias , Senges Jochen 
Published: March 2017

Aims
To analyse outcomes of supraventricular tachycardia (SVT) ablations performed within a prospective German Ablation Quality Registry.

Methods and results
Data from 12 566 patients who underwent catheter ablation of SVT between January 2007 and January 2010 to treat atrial fibrillation (AFIB, 37.2% of procedures), atrial flutter (AFL, 29.9%), atrioventricular nodal re-entrant tachycardia (AVNRT, 23.2%), atrioventricular re-entrant tachycardia (6.3%), and focal atrial tachycardia (AT, 3.4%) were prospectively collected. Patients were followed for at least 1 year. The periprocedural success rate was 96.3%, ranging from 84.3% (focal AT) to 98.9% (AVNRT). Kaplan–Meier mortality estimate at 1 year was 1.4% overall, and as high as 2.6% in the AFL group and 2.8% in the focal AT group. Recurrence of ablated or another symptomatic SVT was observed in 3783 (32.6%) of patients, ranging from 17.2% (AVNRT) to 45.6% (AFIB). Repeat ablation was performed in 12.0% of patients. After 1 year, 74.1% of survivors perceived ablation therapy as successful, 15.7% as partly successful, and 9.6% as unsuccessful. Even in those patients with arrhythmia recurrence, 76.0% perceived ablation as successful or partly successful and 89.6% would still undergo repeat ablation in the same institution.

Conclusion
Ablation therapy for SVT is a safe procedure bringing symptomatic improvement and satisfaction to three quarters of patients after 1 year. Even in patients with arrhythmia recurrence, a high satisfaction level and adherence to the ablating institution could be documented. Strikingly high mortality and stroke rates in follow-up were observed in AFL patients, who apparently need consistent long-term anticoagulation and more medical attention.
Trends in National Emergency Medicine Conference Didactic Lectures Over a 6-Year Period
Authors: Gottlieb Michael , Riddell Jeff , Njie Abdoulie 
Published: March 2017

Introduction:
National conference didactic lectures have traditionally featured hour-long lecture-based presentations. However, there is evidence that longer lectures can lead to both decreased attention and retention of information. The authors sought to identify trends in lecture duration, lecture types, and number of speakers at four national emergency medicine (EM) conferences over a 6-year period.

Methods:
The authors performed a retrospective analysis of the length, number of speakers, and format of didactic lectures at four different national EM conferences over 6 years. The authors abstracted data from the national academic assemblies for the four largest not-for-profit EM organizations in the United States: American Academy of Emergency Medicine, American College of Emergency Physicians, Council of Emergency Medicine Residency Directors, and Society for Academic Emergency Medicine.

Results:
There was a significant yearly decrease in the mean lecture lengths for three of the four conferences. There was an increase in the percentage of rapid fire sessions over the preceding 2 years with a corresponding decrease in the percentage of general educational sessions. There was no significant difference in the mean number of speakers per lecture.

Discussion:
An analysis of 4210 didactic lecture sessions from the annual meetings of four national EM organizations over a 6-year period showed significant decreases in mean lecture length. These findings can help to guide EM continuing medical education conference planning and research.
Defining Clinical Excellence in Hospital Medicine: A Qualitative Study
Authors: Kotwal Susrutha , Peña Ivonne , Howell Eric , Wright Scott 
Published: March 2017

Introduction:
There are now more than 50,000 hospitalists working in the United States. Limited empiric research has been performed to characterize clinical excellence in hospital medicine. We conducted a qualitative study to discover elements judged to be most pertinent to excellence in clinical care delivered by hospitalists.

Methods:
The chiefs of hospital medicine at five hospitals were asked to identify their “clinically best” hospitalists. Data collection, in the form of one-on-one interviews, was directed by an interview guide. Interviews were transcribed verbatim, and the informants' perspectives were analyzed using editing analysis to identify themes.

Results:
A total of 26 hospitalists were interviewed. The mean age of the physicians was 38 years, 13 (50%) were women, and 16 (62%) were non-white. Seven themes emerged that related to clinical excellence in hospital medicine: communicating effectively, appreciating partnerships and collaboration, having superior clinical judgment, being organized and efficient, connecting with patients, committing to continued growth and development, and being professional and humanistic.

Discussion:
This qualitative study describes how respected hospitalists think about excellence in clinical care in hospital medicine. Their perspectives can be used to guide continuing medical education, so that offered programs can pay attention to enhancing the skills of learners so they can develop towards excellence, rather than using only competence as the desired target objective.
Family Stress and Coping From Hospitalization of Clients With Severe Alcohol Use Disorder in Korea
Authors: Park Gyu-Hee , Choi Yun-Jung 
Published: March 2017

Abstract
The rate of relapse and involuntary hospitalization among clients with alcohol use disorder exceeds 40% in South Korea. As a result, family members of clients experience considerable stress and require the assistance of professional services. This empirical study investigates levels of perceived stress and stress coping styles among family members of clients with severe alcohol use disorder and examines the correlations among these variables. Data were collected from three inpatient alcohol rehabilitation centers and five psychiatric hospitals in South Korea. Family stress levels and stress coping styles for 133 respondents were evaluated using the Hospital Stress Rating Scale for Family Members and the Stress Coping Style Checklist. There were significant differences in stress levels according to whether participants had attended a family educational program in the past or were doing so presently. Furthermore, significant differences in stress were observed among participants who were using the stress coping style of easing strained emotions during the client’s hospitalization but who had never attended an educational program. Among the subcategories, stress levels had especially strong relationships with easing strained emotions, seeking advice, and solving problems. The results showed that families with severe alcohol use disorder experience stress from the client’s hospitalization and seek advice from neighbors to deal with worries, privacy concerns, and economic problems. Family interventions are needed to provide family members with strategies to cope with stress, which can support recovery of clients with severe alcohol use disorder.