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https://www.readbyqxmd.com/read/27911679/can-weight-predict-academic-performance-in-college-students-an-analysis-of-college-women-s-self-efficacy-absenteeism-and-depressive-symptoms-as-mediators
#1
Annie Aimé, Aude Villatte, Caroline Cyr, Diane Marcotte
: Over a third of American college students are either overweight or obese, which has been suggested to negatively impact their academic achievement. OBJECTIVE: This study seeks to better understand the relationship between body mass index (BMI) and grade point average (GPA), while examining potential mediators of this association. PARTICIPANTS AND METHODS: The sample consists of 298 college women who volunteered to complete online questionnaires between October and December 2014...
December 2, 2016: Journal of American College Health: J of ACH
https://www.readbyqxmd.com/read/27911235/robustness-of-the-neurological-prognostic-score-in-brain-metastasis-patients-treated-with-gamma-knife-radiosurgery
#2
Toru Serizawa, Yoshinori Higuchi, Osamu Nagano, Shinji Matsuda, Kyoko Aoyagi, Junichi Ono, Naokatsu Saeki, Yasuo Iwadate, Tatsuo Hirai, Shinya Takemoto, Yuta Shibamoto
OBJECTIVE The neurological prognostic score (NPS) was recently proposed as a means for predicting neurological outcomes, such as the preservation of neurological function and the prevention of neurological death, in brain metastasis patients treated with Gamma Knife radiosurgery (GKRS). NPS consists of 2 groups: Group A patients were expected to have better neurological outcomes, and Group B patients were expected to have poorer outcomes. NPS robustness was tested in various situations. METHODS In total, 3040 patients with brain metastases that were treated with GKRS were analyzed...
December 2, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27910832/vacancy-pairing-and-superstructure-in-the-high-pressure-silicate-k1-5mg2si2o7h0-5-a-new-potential-host-for-potassium-in-the-deep-earth
#3
M D Welch, L Bindi, V Petříček, J Plášil
The high-pressure silicate K1.5Mg2Si2O7H0.5, synthesized and characterized by Welch et al. [(2012), Am. Mineral. 97, 1849-1857], has been re-examined with the aim of determining the nature of the superstructure noted in their study. The composition corresponds to a 1:1 combination of KMg2Si2O7H and K2Mg2Si2O7 end-members, but it is not a solid solution. Single-crystal X-ray diffraction data for one of the original K1.5Mg2Si2O7H0.5 crystals synthesized at 16 GPa/1573 K, has been collected using a much longer exposure time in order to improve the intensity statistics of weak superlattice reflections identified by Welch et al...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27908115/detailed-crystallographic-analysis-of-the-ice-vi-to-ice-xv-hydrogen-ordering-phase-transition
#4
Christoph G Salzmann, Ben Slater, Paolo G Radaelli, John L Finney, Jacob J Shephard, Martin Rosillo-Lopez, James Hindley
The D2O ice VI to ice XV hydrogen ordering phase transition at ambient pressure is investigated in detail with neutron diffraction. The lattice constants are found to be sensitive indicators for hydrogen ordering. The a and b lattice constants contract whereas a pronounced expansion in c is found upon hydrogen ordering. Overall, the hydrogen ordering transition goes along with a small increase in volume, which explains why the phase transition is more difficult to observe upon cooling under pressure. Slow-cooling ice VI at 1...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27900383/a-highly-flexible-inorganic-framework-with-amphiphilic-amine-assemblies-as-templates
#5
Hui-Lin Huang, Hsin-Yau Lin, Pei-Shan Chen, Jey-Jau Lee, Hui-Chen Kung, Sue-Lein Wang
A zinc phosphite-phosphate framework, (HA)2[Zn3(HPO3)4-x(HPO4)x] (1; A = cha, coa, iba, pa, and ha; x = 0.3-1) with nanometer-scale channels was prepared. The framework exhibited an extraordinarily high flexibility, 13% expansion at ambient pressure and 27% contraction under a high pressure of over 2.3 GPa without undergoing any phase transformation. The volume changes in the compression-decompression process are reversible. Such unusual adaptability is rare in pure inorganic networks. The molecular volumes of templates range from 165 Å(3) to 228 Å(3), which allows to vary channel aperture increasingly from 13...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27899831/evidence-of-criterion-validity-for-one-pharmacy-school-s-progress-examination-program
#6
Greg L Alston, Wes R Haltom
Objective. To provide evidence that the progress examination program accurately assesses student failure to demonstrate competence. Methods. A progress examination program aligned with each grade level was locally developed and administered annually to 289 PharmD students in the spring of their first year - fourth year. Correlations and linear regressions were performed to compare the examination scores to performance on national licensing examinations and cumulative didactic grade point average (GPA). Odds ratio analysis was run to determine the ability of the passing scores of the progress examination to identify students at increased risk of failing to graduate on time, earn a GPA below 3...
October 25, 2016: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/27897215/novel-ti-ta-hf-zr-alloys-with-promising-mechanical-properties-for-prospective-stent-applications
#7
Jixing Lin, Sertan Ozan, Yuncang Li, Dehai Ping, Xian Tong, Guangyu Li, Cuie Wen
Titanium alloys are receiving increasing research interest for the development of metallic stent materials due to their excellent biocompatibility, corrosion resistance, non-magnetism and radiopacity. In this study, a new series of Ti-Ta-Hf-Zr (TTHZ) alloys including Ti-37Ta-26Hf-13Zr, Ti-40Ta-22Hf-11.7Zr and Ti-45Ta-18.4Hf-10Zr (wt.%) were designed using the d-electron theory combined with electron to atom ratio (e/a) and molybdenum equivalence (Moeq) approaches. The microstructure of the TTHZ alloys were investigated using optical microscopy, XRD, SEM and TEM and the mechanical properties were tested using a Vickers micro-indenter, compression and tensile testing machines...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897174/nanocrystalline-hexagonal-diamond-formed-from-glassy-carbon
#8
Thomas B Shiell, Dougal G McCulloch, Jodie E Bradby, Bianca Haberl, Reinhard Boehler, David R McKenzie
Carbon exhibits a large number of allotropes and its phase behaviour is still subject to significant uncertainty and intensive research. The hexagonal form of diamond, also known as lonsdaleite, was discovered in the Canyon Diablo meteorite where its formation was attributed to the extreme conditions experienced during the impact. However, it has recently been claimed that lonsdaleite does not exist as a well-defined material but is instead defective cubic diamond formed under high pressure and high temperature conditions...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896287/enamel-ribbons-surface-nodules-and-octacalcium-phosphate-in-c57bl-6-amelx-mice-and-amelx-lyonization
#9
Yuanyuan Hu, Charles E Smith, Zhonghou Cai, Lorenza A-J Donnelly, Jie Yang, Jan C-C Hu, James P Simmer
BACKGROUND: Amelogenin is required for normal enamel formation and is the most abundant protein in developing enamel. METHODS: Amelx(+/+), Amelx(+/-) , and Amelx(-/-) molars and incisors from C57BL/6 mice were characterized using RT-PCR, Western blotting, dissecting and light microscopy, immunohistochemistry (IHC), transmission electron microscopy (TEM), scanning electron microscopy (SEM), backscattered SEM (bSEM), nanohardness testing, and X-ray diffraction. RESULTS: No amelogenin protein was detected by Western blot analyses of enamel extracts from Amelx(-/-) mice...
November 2016: Molecular Genetics & Genomic Medicine
https://www.readbyqxmd.com/read/27892978/estimating-survival-in-patients-with-lung-cancer-and-brain-metastases-an-update-of-the-graded-prognostic-assessment-for-lung-cancer-using-molecular-markers-lung-molgpa
#10
Paul W Sperduto, T Jonathan Yang, Kathryn Beal, Hubert Pan, Paul D Brown, Ananta Bangdiwala, Ryan Shanley, Norman Yeh, Laurie E Gaspar, Steve Braunstein, Penny Sneed, John Boyle, John P Kirkpatrick, Kimberley S Mak, Helen A Shih, Alex Engelman, David Roberge, Nils D Arvold, Brian Alexander, Mark M Awad, Joseph Contessa, Veronica Chiang, John Hardie, Daniel Ma, Emil Lou, William Sperduto, Minesh P Mehta
Importance: Lung cancer is the leading cause of cancer-related mortality in the United States and worldwide. As systemic therapies improve, patients with lung cancer live longer and thus are at increased risk for brain metastases. Understanding how prognosis varies across this heterogeneous patient population is essential to individualize care and design future clinical trials. Objective: To update the current Diagnosis-Specific Graded Prognostic Assessment (DS-GPA) for patients with non-small-cell lung cancer (NSCLC) and brain metastases...
November 17, 2016: JAMA Oncology
https://www.readbyqxmd.com/read/27892460/superstrength-of-nanograined-steel-with-nanoscale-intermetallic-precipitates-transformed-from-shock-compressed-martensitic-steel
#11
Hailiang Yu, Ming Yan, Cheng Lu, Anh Kiet Tieu, Huijun Li, Qiang Zhu, Ajit Godbole, Jintao Li, Lihong Su, Charlie Kong
An increasing number of industrial applications need superstrength steels. It is known that refined grains and nanoscale precipitates can increase strength. The hardest martensitic steel reported to date is C0.8 steel, whose nanohardness can reach 11.9 GPa through incremental interstitial solid solution strengthening. Here we report a nanograined (NG) steel dispersed with nanoscale precipitates which has an extraordinarily high hardness of 19.1 GPa. The NG steel (shock-compressed Armox 500T steel) was obtained under these conditions: high strain rate of 1...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27888595/quality-of-life-in-medical-students-with-internet-addiction
#12
Farzad Fatehi, Alireza Monajemi, Anahita Sadeghi, Rita Mojtahedzadeh, Azim Mirzazadeh
The widespread use of internet has caused new psychological, social, and educational problems for the students. The aim of this study was to examine the quality of life in medical students who suffer from internet addiction. This cross-sectional survey was carried out in Tehran University of Medical Sciences, and a total of 174 fourth-to seventh-year undergraduate medical students were enrolled. The quality of life was assessed by WHOQOL-BREF questionnaire which covers four domains of physical health, psychological, social relationships, and the environment...
October 2016: Acta Medica Iranica
https://www.readbyqxmd.com/read/27886502/topological-surface-states-in-dense-solid-hydrogen
#13
Ivan I Naumov, Russell J Hemley
Metallization of dense hydrogen and associated possible high-temperature superconductivity represents one of the key problems of physics. Recent theoretical studies indicate that before becoming a good metal, compressed solid hydrogen passes through a semimetallic stage. We show that such semimetallic phases predicted to be the most stable at multimegabar (∼300  GPa) pressures are not conventional semimetals: they exhibit topological metallic surface states inside the bulk "direct" gap in the two-dimensional surface Brillouin zone; that is, metallic surfaces may appear even when the bulk of the material remains insulating...
November 11, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27886297/high-pressure-dielectric-behavior-of-bamoo4-a-combined-experimental-and-theoretical-study
#14
Tianru Qin, Qinglin Wang, Li Wang, Huacai Yan, Cailong Liu, Yonghao Han, Yanzhang Ma, Chunxiao Gao
In situ impedance measurements were employed to investigate the electrical transport properties of BaMoO4 under pressures of up to 20.0 GPa. Two anomalous changes in the electrical parameters were found, related to the pressure-induced structural phase transitions. The dielectric performance of BaMoO4 was improved by pressure. The dispersion in the real part of dielectric constant versus frequency weakens with increasing pressure. Based on the first-principles calculations, the increases of resistance with increasing pressure in the tetragonal and monoclinic phases were mainly caused by the increasing defect levels...
November 25, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27886243/creating-new-layered-structures-at-high-pressures-sis2
#15
Dušan Plašienka, Roman Martoňák, Erio Tosatti
Old and novel layered structures are attracting increasing attention for their physical, electronic, and frictional properties. SiS2, isoelectronic to SiO2, CO2 and CS2, is a material whose phases known experimentally up to 6 GPa exhibit 1D chain-like, 2D layered and 3D tetrahedral structures. We present highly predictive ab initio calculations combined with evolutionary structure search and molecular dynamics simulations of the structural and electronic evolution of SiS2 up to 100 GPa. A highly stable CdI2-type layered structure, which is octahedrally coordinated with space group surprisingly appears between 4 and up to at least 100 GPa...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885781/cellular-response-of-osteoblasts-to-low-modulus-ti-24nb-4zr-8sn-alloy-mesh-structure
#16
K C Nune, R D K Misra, S J Li, Y L Hao, R Yang
Titanium alloys (Ti-6Al-4V and Ti-6Al-7Nb) are widely used for implants, which are characterized by high elastic modulus (∼110 GPa) with (α + β) structure and that may induce undesirable stress shielding effect and immune responses associated with the presence of toxic elements. In this regard, we have combined the attributes of a new alloy design and the concept of additive manufacturing to fabricate 3D scaffolds with an interconnected porous structure. The new alloy is a β-type Ti-24Nb-4Zr-8Sn (Ti2448) alloy with significantly reduced modulus...
November 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27881596/combined-iron-deficiency-and-low-aerobic-fitness-doubly-burden-academic-performance-among-women-attending-university
#17
Samuel P Scott, Mary Jane De Souza, Karsten Koehler, Laura E Murray-Kolb
BACKGROUND: Academic success is a key determinant of future prospects for students. Cognitive functioning has been related to nutritional and physical factors. Here, we focus on iron status and aerobic fitness in young-adult female students given the high rate of iron deficiency and declines in fitness reported in this population. OBJECTIVES: We sought to explore the combined effects of iron status and fitness on academic success and to determine whether these associations are mediated by cognitive performance...
November 23, 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27876860/possible-generation-of-heat-from-nuclear-fusion-in-earth-s-inner-core
#18
Mikio Fukuhara
The cause and source of the heat released from Earth's interior have not yet been determined. Some research groups have proposed that the heat is supplied by radioactive decay or by a nuclear georeactor. Here we postulate that the generation of heat is the result of three-body nuclear fusion of deuterons confined in hexagonal FeDx core-centre crystals; the reaction rate is enhanced by the combined attraction effects of high-pressure (~364 GPa) and high-temperature (~5700 K) and by the physical catalysis of neutral pions: (2)D + (2)D + (2)D → 2(1)H + (4)He + 2  + 20...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27875893/high-pressure-chemistry-of-thioaldehydes-a-first-principles-molecular-dynamics-study
#19
Yaoting Zhang, Nicholas J Mosey
First-principles molecular dynamics simulations are used to investigate the chemical behavior of bulk thioacetaldehyde (MeC(H)S) in response to changes in pressure, P. The simulations show that these molecules oligomerize in response to applied P. Oligomerization is initiated through C-S bond formation, with constrained dynamics simulations showing that the barrier to this reaction step is lowered significantly by applied P. Subsequent reactions involving the formation of additional C-S bonds or radical processes that lead to S-S and C-C bonds lengthen the oligomers...
November 21, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27874153/effects-of-personality-traits-on-collaborative-performance-in-problem-based-learning-tutorials
#20
Hye Won Jang, Seung Won Park
To examine the relationship between students' collaborative performance in a problem-based learning (PBL) environment and their personality traits. Methods:This retrospective, cross-sectional study was conducted using student data of a PBL program between 2013 and 2014 at Sungkyunkwan University School of Medicine, Seoul, South Korea. Eighty students were included in the study. Student data from the Temperament and Character Inventory were used as a measure of their personality traits. Peer evaluation scores during PBL were used as a measure of students' collaborative performance...
December 2016: Saudi Medical Journal
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