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https://www.readbyqxmd.com/read/28549338/fast-backprojection-based-reconstruction-of-spectral-spatial-epr-images-from-projections-with-the-constant-sweep-of-a-magnetic-field
#1
Denis A Komarov, Hiroshi Hirata
In this paper, we introduce a procedure for the reconstruction of spectral-spatial EPR images using projections acquired with the constant sweep of a magnetic field. The application of a constant field-sweep and a predetermined data sampling rate simplifies the requirements for EPR imaging instrumentation and facilitates the backprojection-based reconstruction of spectral-spatial images. The proposed approach was applied to the reconstruction of a four-dimensional numerical phantom and to actual spectral-spatial EPR measurements...
May 17, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28549276/different-seizure-onset-patterns-in-mesiotemporal-lobe-epilepsy-have-a-distinct-interictal-signature
#2
Birgit Frauscher, Nicolás von Ellenrieder, François Dubeau, Jean Gotman
OBJECTIVE: Experimental research demonstrated that distinct underlying mechanisms go along with different seizure-onset patterns on EEG. These different mechanisms may reflect different tissue abnormalities which, we hypothesize, could also be reflected in morphological differences in the interictal epileptic and background EEG activity. METHODS: We searched our database of intracranial EEG recordings for mesiotemporal lobe epilepsy patients with either predominant low-voltage fast activity (LVF) or periodic spiking (PS)...
May 9, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28549247/individuals-with-clinically-significant-insomnia-symptoms-are-characterised-by-a-negative-sleep-related-expectancy-bias-results-from-a-cognitive-experimental-assessment
#3
Hannah Courtauld, Lies Notebaert, Bronwyn Milkins, Simon D Kyle, Patrick J F Clarke
Cognitive models of insomnia consistently suggest that negative expectations regarding the consequences of poor sleep contribute to the maintenance of insomnia. To date, however, no research has sought to determine whether insomnia is indeed characterised by such a negative sleep-related expectancy bias, using objective cognitive assessment tasks which are more immune to response biases than questionnaire assessments. Therefore, the current study employed a reaction-time task assessing biased expectations among a group with clinically significant insomnia symptoms (n = 30) and a low insomnia symptoms group (n = 40)...
May 17, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28549201/cytogenetic-aspects-of-a-canine-breast-carcinosarcoma-a-case-report
#4
C S D Morais, P R A M Affonso, J A Bitencourt, A A Wenceslau
This study searched a rare and aggressive type of cancer in dogs and humans, the breast carcinosarcoma. Both clinical and pathological traits of mammary carcinosarcomas in dogs are similar to humans, such as infrequent occurrence, fast tumor growth, and unfavorable prognosis when compared to carcinomas. Other possible alterations include chromosomal abnormalities that can be useful for the identification of tumoral cells and diagnosis. The aim of this study was to compare the chromosomal features of peripheral lymphocytes and tumor cells in a mammary carcinosarcoma of a 14-year-old female Poodle...
May 25, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28549064/chemomechanical-regulation-of-myosin-ic-cross-bridges-deducing-the-elastic-properties-of-an-ensemble-from-single-molecule-mechanisms
#5
Florian Berger, A J Hudspeth
Myosin Ic is thought to be the principal constituent of the motor that adjusts mechanical responsiveness during adaptation to prolonged stimuli by hair cells, the sensory receptors of the inner ear. In this context myosin molecules operate neither as filaments, as occurs in muscles, nor as single or few molecules, as characterizes intracellular transport. Instead, myosin Ic molecules occur in a complex cluster in which they may exhibit cooperative properties. To better understand the motor's remarkable function, we introduce a theoretical description of myosin Ic's chemomechanical cycle based on experimental data from recent single-molecule studies...
May 26, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28548842/engineering-the-composition-and-structure-of-bimetallic-au-cu-alloy-nanoparticles-in-carbon-nanofibers-self-supported-electrode-materials-for-electrocatalytic-water-splitting
#6
Juan Wang, Han Zhu, Danni Yu, JiaWei Chen, JiaDong Chen, Ming Zhang, LiNa Wang, MingLiang Du
The bimetallic Au-Cu alloy nanoparticles have been constructed in electrospun carbon nanofibers (Au-Cu/CNFs), employing as high efficient hydrogen evolution reaction (HER) electrode. The morphology, structure and composition of bimetallic Au-Cu alloy can be controlled by adjusting the precursor nanofibers through a facile approach. With the increased Cu contents, the Au-Cu alloy have a transition from homogenous AuCu3 alloy phase to Au3Cu phase with Cu shell. The self-supported bimetallic Au-Cu/CNFs hybrid can be directly employed as electrodes materials for water splitting and it showed excellent electrochemical activity, including long-term stability, high exchange current density and low overpotential...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548520/oxysulfide-lialso-a-lithium-superionic-conductor-from-first-principles
#7
Xuelong Wang, Ruijuan Xiao, Hong Li, Liquan Chen
Through first-principles calculations and crystal structure prediction techniques, we identify a new layered oxysulfide LiAlSO in orthorhombic structure as a novel lithium superionic conductor. Two kinds of stacking sequences of layers of AlS_{2}O_{2} are found in different temperature ranges. Phonon and molecular dynamics simulations verify their dynamic stabilities, and wide band gaps up to 5.6 eV are found by electronic structure calculations. The lithium migration energy barrier simulations reveal the collective interstitial-host ion "kick-off" hopping mode with barriers lower than 50 meV as the dominating conduction mechanism for LiAlSO, indicating it to be a promising solid-state electrolyte in lithium secondary batteries with fast ionic conductivity and a wide electrochemical window...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548302/fast-computation-of-full-density-matrix-of-multispin-systems-for-spatially-localized-in-vivo-magnetic-resonance-spectroscopy
#8
Yan Zhang, Li An, Jun Shen
PURPOSE: Numerical simulations of three-dimensionally localized MRS spectra have been very time-consuming for multi-spin systems because the current state-of-the-art requires computation of a large ensemble of spins pixel-by-pixel in three dimensional space. This paper describes a highly accelerated technique for computing spatially localized MRS spectra using the full solution to the Liouville-von Neumann equation. METHODS: The time evolution of spatially localized multispin density matrix as the full solution to the Liouville-von Neumann equation was analyzed...
May 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28548292/hypertriglyceridemic-acute-pancreatitis-in-an-emergency-department-the-typical-clinical-features-and-genetic-variants
#9
Wan Jun Chen, Xiao Fan Sun, Rui Xue Zhang, Min Jie Xu, Tong Hai Dou, Xiao Bin Zhang, Min Zhong, Wei Qiang Yang, Li Liu, Xiao Ye Lu, Chang Qing Zhu
OBJECTIVE: To investigate the clinical characteristics of hypertriglyceridemic acute pancreatitis (HTGAP), and the molecular foundation contributing to the hypertriglyceridemia in this group of patients. METHODS: Clinical data from 329 patients with AP were collected and analyzed. All the patients were divided into 1) HTGAP group (n = 40), with fasting serum triglyceride ≥ 500 mg/dL; and 2) NHTGAP group (n = 289). Next, the targeted next-generation sequencing was applied in 11 HTGAP patients to detect the genetic mutation associated with hypertriglyceridemia that included apolipoprotein A-5 (APOA5), apolipoprotein C-3 (APOC3), apolipoprotein E (APOE), BLK proto-oncogene, lipoprotein lipase (LPL), apolipoprotein C-2 (APOC2), glycosylphosphatidylinositol anchored high density lipoprotein binding protein-1(GPIHBP1), and lipase maturation factor-1(LMF1)...
May 26, 2017: Journal of Digestive Diseases
https://www.readbyqxmd.com/read/28548185/-evaluation-the-american-college-of-cardiology-and-american-heart-association-predictive-score-for-cardiovascular-diseases
#10
Mónica Acevedo, Giovanna Valentino, Verónica Kramer, María José Bustamante, Marcela Adasme, Lorena Orellana, Fernando Baraona, Carlos Navarrete
BACKGROUND: Recently, the American College of Cardiology and American Heart Association (ACC/AHA) proposed a new cardiovascular risk (CV) score. AIM: To evaluate the new risk score (ACC/AHA 2013) in a Chilean population. MATERIAL AND METHODS: Between 2002 and 2014, body mass index (BMI), waist circumference, blood pressure, lipid profile and fasting blood glucose levels were measured and a survey about CV risk factors was responded by 3,284 subjects aged 40 to 79 years (38% females), living in urban Santiago...
March 2017: Revista Médica de Chile
https://www.readbyqxmd.com/read/28548141/glass-capillary-based-microfluidic-elisa-for-rapid-diagnostics
#11
Xiaotian Tan, Maung Kyaw Khaing Oo, Yuan Gong, Yaoxin Li, Hongbo Zhu, Xudong Fan
Enzyme-linked immunosorbent assay (ELISA) is widely used in medical diagnostics and fundamental biological research due to its high specificity and reproducibility. However, the traditional 96-well-plate based ELISA still suffers from several notable drawbacks, such as long assay time (4-6 hours), burdensome procedures and large sample/reagent volumes (∼100 μl), which significantly limit traditional ELISA's applications in rapid clinical diagnosis and quasi-real-time prognosis of some fast-developing diseases...
May 26, 2017: Analyst
https://www.readbyqxmd.com/read/28546909/porous-ionic-membrane-based-flexible-humidity-sensor-and-its-multifunctional-applications
#12
Tie Li, Lianhui Li, Hongwei Sun, Yan Xu, Xuewen Wang, Hui Luo, Zheng Liu, Ting Zhang
A highly flexible porous ionic membrane (PIM) is fabricated from a polyvinyl alcohol/KOH polymer gel electrolyte, showing well-defined 3D porous structure. The conductance of the PIM changes more than 70 times as the relative humidity (RH) increases from 10.89% to 81.75% with fast and reversible response at room temperature. In addition, the PIM-based sensor is insensitive to temperature (0-95 °C) and pressure (0-6.8 kPa) change, which indicates that it can be used as highly selective flexible humidity sensor...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28546845/expression-purification-and-structural-analysis-of-functional-gaba-transporter-1-using-the-baculovirus-expression-system
#13
Jing Hu, Chris Weise, Christoph Böttcher, Hua Fan, Jian Yin
The γ-aminobutyric acid (GABA) transporter 1 (GAT1) belongs to a family of Na(+) and Cl(-)-coupled transport proteins and possesses 12 putative transmembrane domains. To perform structural analyses of the GAT1 protein, the GAT1/green fluorescent protein (GFP) fusion protein was functionally expressed in insect Sf9 cells by the BAC-TO-BAC(®) baculovirus expression system. A two-step procedure to purify the GAT1/GFP fusion protein from insect Sf9 cells has been established and involves immunoaffinity chromatography using self-prepared anti-GFP antibodies and size-exclusion fast protein liquid chromatography (SE-FPLC)...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28546508/stable-carbon-isotopes-in-breath-reveal-fast-incorporation-rates-and-seasonally-variable-but-rapid-fat-turnover-in-the-common-shrew-sorex-araneus
#14
Lara Keicher, M Teague O'Mara, Christian C Voigt, Dina K N Dechmann
Small non-migratory mammals with Northern distribution ranges apply a variety of behavioural and physiological wintering strategies. A rare energy saving strategy is Dehnel's phenomenon, involving a reduction and later regrowth of the body, several organs and parts of the skeleton in red-toothed shrews (Soricidae). The size extremes coincide with major life stages. Yet, the physiological consequences for the shrews' metabolism remain poorly understood. In keeping with the energetic limitations that may induce the size changes, we hypothesized that metabolic incorporation rates should remain the same across the shrews' lifetime...
May 25, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28546457/amino-acid-homeostasis-and-signalling-in-mammalian-cells-and-organisms
#15
REVIEW
Stefan Bröer, Angelika Bröer
Cells have a constant turnover of proteins that recycle most amino acids over time. Net loss is mainly due to amino acid oxidation. Homeostasis is achieved through exchange of essential amino acids with non-essential amino acids and the transfer of amino groups from oxidised amino acids to amino acid biosynthesis. This homeostatic condition is maintained through an active mTORC1 complex. Under amino acid depletion, mTORC1 is inactivated. This increases the breakdown of cellular proteins through autophagy and reduces protein biosynthesis...
May 25, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28546075/antimicrobial-storage-and-antibiotic-knowledge-in-the-community-a-cross-sectional-pilot-study-in-north-western-angola
#16
Joana Cortez, Edite Rosário, João E Pires, João Taborda Lopes, Moisés Francisco, Erika Vlieghe, Miguel Brito
BACKGROUND: Antimicrobials are drugs that were once lifesavers and mainly curative. Nowadays their value is increasingly under pressure because of the fast and worldwide emergence of antimicrobial resistance, which, in low resources settings, frequently occurs in microorganisms that are likely to be transmitted in the community. METHODS: A cross-sectional pilot study including 102 households within the 10th HDSS round in Dande, Bengo Province, Angola. RESULTS: From the total 102 households piloted, 77...
May 22, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28545589/gastrointestinal-tolerance-of-low-fodmap-oral-nutrition-supplements-in-healthy-human-subjects-a-randomized-controlled-trial
#17
Jennifer Erickson, Renee Korczak, Qi Wang, Joanne Slavin
BACKGROUND: There has been increasing interest in utilizing a diet low in fermentable oligosaccharides, disaccharides, monosaccharides and polyols (FODMAPs) for the treatment of irritable bowel syndrome (IBS), a functional gastrointestinal disease. While studies have indicated that this diet can be effective at symptom reduction, it is a restrictive diet and patients may find it challenging to find low FODMAP products to meet their nutrient needs. The primary objective of this study was to assess the gastrointestinal (GI) tolerance of three low FODMAP oral nutrition supplements (ONS) in healthy adults...
May 25, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28545458/determinants-of-eating-at-local-and-western-fast-food-venues-in-an-urban-asian-population-a-mixed-methods-approach
#18
Nasheen Naidoo, Rob M van Dam, Sheryl Ng, Chuen Seng Tan, Shiqi Chen, Jia Yi Lim, Mei Fen Chan, Ling Chew, Salome A Rebello
BACKGROUND: Like several Southeast Asian countries, Singapore has a complex eating-out environment and a rising eating-out prevalence. However the determinants and drivers of eating-out in urban Asian environments are poorly understood. METHODS: We examined the socio-demographic characteristics of persons who frequently ate away from home in local eateries called hawker centres and Western fast-food restaurants, using data from 1647 Singaporean adults participating in the National Nutrition Survey (NNS) 2010...
May 25, 2017: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/28545081/perturbed-adipose-tissue-hydrogen-peroxide-metabolism-in-centrally-obese-men-association-with-insulin-resistance
#19
May G Akl, Eman Fawzy, Maha Deif, Ayman Farouk, Amany K Elshorbagy
OBJECTIVE: Although adipose tissue hydrogen peroxide (H2O2) and its metabolizing enzymes have been linked to obesity and insulin resistance in animal studies, this relation remains to be evaluated in humans. METHODS: Non-diabetic men (N = 43, median age, 49 (37, 54 y)) undergoing abdominal surgeries were studied. Participants were classified by body mass index (BMI) into normal-weight (N = 19), or overweight/obese (Ow/Ob; BMI ≥25; N = 24). Centrally obese men were identified by waist-height ratio ≥0...
2017: PloS One
https://www.readbyqxmd.com/read/28544922/efficacy-of-benzalkonium-chloride-against-bioluminescent-p-aeruginosa-atcc9027-constructs
#20
N Shah, D C Naseby
Whole cell biosensors have been seldom used in the pharmaceutical and cosmetics industries for preservative efficacy testing (PET). According to several pharmacopoeias, preservatives should be tested for microbial activity using traditional viable count techniques; the use of whole cell microbial biosensors potentially provides an alternative, fast, and efficient method. The aim of the study was to assess the applicability of Pseudomonas aeruginosa ATCC9027 and its validated bioluminescent strains for preservative efficacy tests using benzalkonium chloride (BKC)...
April 23, 2017: Biosensors & Bioelectronics
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