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https://www.readbyqxmd.com/read/29793108/manganese-contamination-affects-the-motor-performance-of-wild-northern-quolls-dasyurus-hallucatus
#1
Ami Fadhillah Amir Abdul Nasir, Skye F Cameron, Amanda C Niehaus, Christofer J Clemente, Frank A von Hippel, Robbie S Wilson
Neuromotor deficits are an important sign of manganese (Mn) toxicity in humans and laboratory animals. However, the impacts of Mn exposure on the motor function of wild animals remains largely unknown. Here, we assessed the impact of chronic exposure to Mn from active mining operations on Groote Eylandt, Australia on the motor function of the semi-arboreal northern quoll (Dasyurus hallucatus), an endangered species. The three motor tests conducted-maximum sprint speed on a straight run, manoeuvrability around a corner, and motor control on a balance beam-showed that elevated Mn body burden did not diminish performance of these traits...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29793101/-survey-of-wellbeing-of-young-children-swyc-how-does-it-fit-for-screening-developmental-delay-in-brazilian-children-aged-4-to-58-months
#2
R S Moreira, L C Magalhães, C M Siqueira, C R L Alves
OBJECTIVE: To replicate the original normative study of the SWYC's Milestones Questionnaires for children in Brazil. Our goals were to compare the performance of Brazilian and North American children using this screening tool and to verify the reliability and validity of the Brazilian version. STUDY DESIGN AND SETTING: Cross-sectional study with children aged 1-65 months and their guardians, recruited in southern Brazil. Parents were interviewed using the Developmental Milestones questionnaire, which contains 10 questions about cognitive, motor, social, and language abilities...
May 21, 2018: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/29793061/microstructural-imaging-of-the-human-brain-with-a-super-scanner-10-key-advantages-of-ultra-strong-gradients-for-diffusion-mri
#3
D K Jones, D C Alexander, R Bowtell, M Cercignani, F Dell'Acqua, D J McHugh, K L Miller, M Palombo, G J M Parker, U S Rudrapatna, C M W Tax
The key component of a microstructural diffusion MRI 'super-scanner' is a dedicated high-strength gradient system that enables stronger diffusion weightings per unit time compared to conventional gradient designs. This can, in turn, drastically shorten the time needed for diffusion encoding, increase the signal-to-noise ratio, and facilitate measurements at shorter diffusion times. This review, written from the perspective of the National Facility for In Vivo MR Imaging of Human Tissue Microstructure, an initiative to establish a shared 300 mT/m-gradient facility amongst the microstructural imaging community, describes ten advantages of ultra-strong gradients for microstructural imaging...
May 21, 2018: NeuroImage
https://www.readbyqxmd.com/read/29793040/quinones-and-nitroaromatic-compounds-as-subversive-substrates-of-staphylococcus-aureus-flavohemoglobin
#4
Myriam Moussaoui, Lina Misevičienė, Žilvinas Anusevičius, Audronė Marozienė, Florence Lederer, Laura Baciou, Narimantas Čėnas
In microorganisms, flavohemoglobins (FHbs) containing FAD and heme (Fe3+ , metHb) convert NO. into nitrate at the expense of NADH and O2 . FHbs contribute to bacterial resistance to nitrosative stress. Therefore, inhibition of FHbs functions may decrease the pathogen virulence. We report here a kinetic study of the reduction of quinones and nitroaromatic compounds by S. aureus FHb. We show that this enzyme rapidly reduces quinones and nitroaromatic compounds in a mixed single- and two-electron pathway. The reactivity of nitroaromatics increased upon an increase in their single-electron reduction potential (E1 7 ), whereas the reactivity of quinones poorly depended on their E1 7 with a strong preference for a 2-hydroxy-1,4-naphthoquinone structure...
May 21, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29792972/association-between-early-confirmatory-testing-and-the-adoption-of-active-surveillance-for-men-with-favorable-risk-prostate-cancer
#5
Deborah R Kaye, Ji Qi, Todd M Morgan, Susan Linsell, Brian R Lane, James E Montie, Michael L Cher, David C Miller
OBJECTIVE: To examine the relationship between the use and results of early confirmatory testing and persistence on active surveillance (AS). METHODS: We identified all men in the MUSIC registry diagnosed with favorable-risk prostate cancer from 01/2016-02/2017. We next examined trends in the use of early confirmatory test(s), defined as repeat biopsy, prostate MRI and/or molecular classifiers obtained within 6-months of the initial cancer diagnosis, in patients with favorable-risk prostate cancer...
May 21, 2018: Urology
https://www.readbyqxmd.com/read/29792968/applicability-of-endochitinase-of-flavobacterium-johnsoniae-with-transglycosylation-activity-in-generating-long-chain-chitooligosaccharides
#6
Papa Rao Vaikuntapu, Mohan Krishna Mallakuntla, Subha Narayan Das, Bhoopal Bhuvanachandra, Bellamkonda Ramakrishna, Sandhya Rani Nadendla, Appa Rao Podile
Chitin and its derivatives are used for a variety of applications. Flavobacterium johnsoniae UW1 is an aerobic Gram-negative bacterium and genome analysis revealed the presence of 10 glycoside hydrolases (GHs) that may degrade or modify chitin. The gene encoding chitinase B (FjchiB), which encodes a single catalytic GH18 domain has been cloned and heterologously expressed in Escherichia coli. FjChiB was optimally active in 50 mM sodium citrate buffer (pH 6.0) at 40 °C. FjChiB was salt-tolerant and catalytically versatile, with substrate specificity towards 75% DDA (degree of de-acetylation) chitosan, followed by colloidal chitin...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792960/hybrid-chitosan-tio-2-zns-prepared-under-mild-conditions-with-visible-light-driven-photocatalytic-activity
#7
A Jbeli, A M Ferraria, A M Botelho do Rego, S Boufi, S Bouattour
Thin films of chitosan (CS) coated on glass substrates were used as support for the immobilization of nanostructures TiO2 /ZnS via a mild chemical process followed by a hydrothermal treatment at 90 °C. The preparation route involved the coating of the CS film on the glass substrate followed by the deposition of a thin layer of Ti(OBu)4 precursor and immersion in a solution of Zn(O2 CCH3 )2 and Na2 S. After a hydrothermal treatment at 90 °C, an even layer of TiO2 anatase decorated by ZnS nanorods was generated...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792940/a-randomized-control-trial-to-determine-the-effectiveness-and-physiological-effects-of-spinal-manipulation-and-spinal-mobilization-compared-to-each-other-and-a-sham-condition-in-patients-with-chronic-low-back-pain-study-protocol-for-the-relief-study
#8
Brian C Clark, David W Russ, Masato Nakazawa, Christopher R France, Stevan Walkowski, Timothy D Law, Megan Applegate, Niladri Mahato, Samuel Lietkam, James Odenthal, Daniel Corcos, Simeon Hain, Betty Sindelar, Robert J Ploutz-Snyder, James S Thomas
BACKGROUND: Low back pain (LBP) is one of the most common reasons for seeking medical care. Manipulative therapies are a common treatment for LBP. Few studies have compared the effectiveness of different types of manipulative therapies. Moreover, the physiologic mechanisms underlying these treatments are not fully understood. Herein, we present the study protocol for The Researching the Effectiveness of Lumbar Interventions for Enhancing Function Study (The RELIEF Study). METHODS AND STUDY DESIGN: The RELIEF Study is a Phase II RCT with a nested mechanistic design...
May 21, 2018: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/29792936/efficient-detection-of-copy-number-mutations-in-pms2-exons-with-close-homologs-detection-of-copy-number-variants-in-3-pms2-exons
#9
Daniel S Herman, Christina Smith, Chang Liu, Cecily P Vaughn, Selvi Palaniappan, Colin C Pritchard, Brian H Shirts
Detection of 3' PMS2 copy number mutations that cause Lynch syndrome is difficult, because of highly homologous pseudogenes. To improve the accuracy and efficiency of clinical screening for these mutations, we developed a new method to analyze standard capture-based, next-generation sequencing data to identify deletions and duplications in PMS2 exons 9 to 15. The approach captures sequence reads using PMS2 targets, maps sequences randomly amongst regions with equal mapping quality, counts reads aligned to homologous exons and introns, and flags read count ratios outside of empirically derived reference ranges...
May 21, 2018: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/29792883/plasma-n-glycan-signatures-associate-with-features-of-inflammatory-bowel-diseases
#10
Florent Clerc, Mislav Novokmet, Viktoria Dotz, Karli R Reiding, Noortje de Haan, Guinevere S M Kammeijer, Hans Dalebout, Marco R Bladergroen, Frano Vukovic, Erdmann Rapp, Stephan R Targan, Gildardo Barron, Natalia Manetti, Anna Latiano, Dermot P B McGovern, Vito Annese, Gordan Lauc, Manfred Wuhrer
BACKGROUND & AIMS: Biomarkers are needed for early detection of Crohn's disease (CD) and ulcerative colitis (UC) or to predict patient outcomes. Glycosylation is a common and complex post-translational modification of proteins that affects their structure and activity. We compared plasma N-glycosylation profiles between patients with CD or UC and healthy individuals (controls). METHODS: We analyzed the total plasma N-glycomes of 2635 patients with inflammatory bowel diseases and 996 controls by mass spectrometry with a linkage-specific sialic acid derivatization technique...
May 21, 2018: Gastroenterology
https://www.readbyqxmd.com/read/29792809/thionine-self-assembled-structures-on-graphene-formation-organization-and-doping
#11
Thiago Sousa, Thales Fernando Damasceno Fernandes, Matheus J S Matos, Eduardo Nery Duarte Araujo, Mario S C Mazzoni, Bernardo R A Neves, Flávio Plentz
The association of organic molecules with 2D materials, creating hybrid systems with mutual influences, constitutes an important testbed for both basic science self-assembly studies and perspective applications. Following this concept, in this work, we show a rich phenomenology that is involved in the interaction of thionine with graphene, leading to a hybrid material formed by well-organized self-assembled structures atop graphene. This composite system is investigated by atomic force microscopy, electric transport measurements, and first principles calculations, which show: 1) an interesting time evolution of thionine self-assembled structures atop graphene; 2) the final molecular assembly is highly oriented (in accordance with the underlying graphene surface symmetry); and 3) thionine introduces a strong n-type doping effect in graphene...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29792747/interpretation-time-using-a-concurrent-read-computer-aided-detection-system-for-automated-breast-ultrasound-in-breast-cancer-screening-of-women-with-dense-breast-tissue
#12
Yulei Jiang, Marc F Inciardi, Alexandra V Edwards, John Papaioannou
OBJECTIVE: The purpose of this study was to compare diagnostic accuracy and interpretation time of screening automated breast ultrasound (ABUS) for women with dense breast tissue without and with use of a recently U.S. Food and Drug Administration-approved computer-aided detection (CAD) system for concurrent read. MATERIALS AND METHODS: In a retrospective observer performance study, 18 radiologists interpreted a cancer-enriched set (i.e., cancer prevalence higher than in the original screening cohort) of 185 screening ABUS studies (52 with and 133 without breast cancer)...
May 24, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29792724/a-systematic-understanding-of-signaling-by-erbb2-in-cancer-using-phosphoproteomics
#13
C Sidhanth, P Manasa, S Krishnapriya, S Sneha, S Bindhya, R P Nagare, M Garg, T S Ganesan
ErbB2 is an important receptor tyrosine kinase and a member of the ErbB family. Although it does not have a specific ligand, it transmits signals downstream by heterodimerization with other receptors in the family. It plays a major role in a variety of cellular responses like proliferation, differentiation, and adhesion. ErbB2 is amplified at the DNA level in breast cancer (20%-30%) and gastric cancer (10%-20%), and trastuzumab is effective as a therapeutic antibody. This review is a critical analysis of the currently published data on the signaling pathways of ErbB2 and the interacting proteins...
May 24, 2018: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/29792696/biochemical-and-structural-characterization-of-a-schiff-base-in-the-radical-mediated-biosynthesis-of-4-demethylwyosine-by-tyw1
#14
Tsehai A J Grell, Anthony P Young, Catherine L Drennan, Vahe Bandarian
TYW1 is a radical S-adenosyl-l-methionine (SAM) enzyme that catalyzes the condensation of pyruvate and N-methylguanosine to form the posttranscriptional modification, 4-demethylwyosine, in situ on transfer RNA (tRNA). Two mechanisms have been proposed for this transformation, with one of the possible mechanisms invoking a Schiff base intermediate formed between a conserved lysine residue and pyruvate. Utilizing a combination of mass spectrometry and X-ray crystallography, we have obtained evidence to support the formation of a Schiff base lysine adduct in TYW1...
May 24, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29792675/electron-phonon-coupling-and-resonant-relaxation-from-1d-and-1p-states-in-pbs-quantum-dots
#15
Eric R Kennehan, Grayson S Doucette, Ashley R Marshall, Christopher Grieco, Kyle T Munson, Matthew C Beard, John B Asbury
Observations of the hot-phonon bottleneck, which is predicted to slow the rate of hot carrier cooling in quantum confined nanocrystals, have been limited to date for reasons that are not fully understood. We used time-resolved infrared spectroscopy to directly measure higher energy intraband transitions in PbS colloidal quantum dots. Direct measurements of these intraband states permitted detailed analysis of the electronic overlap of the quantum confined states that may influence their relaxation processes...
May 24, 2018: ACS Nano
https://www.readbyqxmd.com/read/29792674/partial-intrinsic-disorder-governs-the-dengue-capsid-protein-conformational-ensemble
#16
Priscilla L S Boon, Wuan Geok Saw, Xin Xiang Lim, Palur Venkata Raghuvamsi, Roland G Huber, Jan K Marzinek, Daniel A Holdbrook, Ganesh S Anand, Gerhard Grüber, Peter J Bond
The 11 kDa, positively charged dengue capsid protein (C protein) exists stably as a homodimer and co-localizes with the viral genome within mature viral particles. Its core is composed of four alpha helices encompassing a small hydrophobic patch that may interact with lipids, but approximately 20% of the protein at the N-terminus is intrinsically disordered, making it challenging to elucidate its conformational landscape. Here, we combine small-angle X-ray scattering (SAXS), amide hydrogen-deuterium exchange mass spectrometry (HDXMS), and atomic-resolution molecular dynamics (MD) simulations to probe the dynamics of dengue C proteins...
May 24, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29792672/biosynthesis-of-lincosamide-antibiotics-reactions-associated-with-degradation-and-detoxification-pathways-play-a-constructive-role
#17
Daozhong Zhang, Zhijun Tang, Wen Liu
Natural products typically are small molecules produced by living organisms. These products possess a wide variety of biological activities and thus have historically played a critical role in medicinal chemistry and chemical biology either as chemotherapeutic agents or as useful tools. Natural products are not synthesized for use by human beings; rather, living organisms produce them in response to various biochemical processes and environmental concerns, both internal and external. These processes/concerns are often dynamic and thus motivate the diversification, optimization, and selection of small molecules in line with changes in biological function...
May 24, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29792591/comprehensive-evolutionary-and-phylogenetic-analysis-of-hepacivirus-n-hnv
#18
M S da Silva, D M Junqueira, L F Baumbach, S P Cibulski, A C S Mósena, M N Weber, S Silveira, G M de Moraes, R D Maia, V C S Coimbra, C W Canal
Hepaciviruses (HVs) have been detected in several domestic and wild animals and present high genetic diversity. The actual classification divides the genus Hepacivirus into 14 species (A-N), according to their phylogenetic relationships, including the bovine hepacivirus [Hepacivirus N (HNV)]. In this study, we confirmed HNV circulation in Brazil and sequenced the whole genome of two strains. Based on the current classification of HCV, which is divided into genotypes and subtypes, we analysed all available bovine hepacivirus sequences in the GenBank database and proposed an HNV classification...
May 24, 2018: Journal of General Virology
https://www.readbyqxmd.com/read/29792586/the-incubation-period-of-hepatitis-e-genotype-1-insights-from-pooled-analyses-of-travellers
#19
A S Azman, I Ciglenecki, C Oeser, B Said, R S Tedder, S Ijaz
Hepatitis E virus genotype 1 (HEV G1) is an important cause of morbidity and mortality in Africa and Asia. HEV G1's natural history, including the incubation period, remains poorly understood, hindering surveillance efforts and effective control. Using individual-level data from 85 travel-related HEV G1 cases in England and Wales, we estimate the incubation period distribution using survival analysis methods, which allow for appropriate inference when only time ranges, rather than exact times are known for the exposure to HEV and symptom onset...
May 24, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29792559/frozen-white-leg-shrimp-litopenaeus-vannamei-in-korean-markets-as-a-source-of-aeromonas-spp-harboring-antibiotic-and-heavy-metal-resistance-genes
#20
Benthotage C J De Silva, Sabrina Hossain, Pasan S Dahanayake, Gang-Joon Heo
As the most consumed shrimp variety, white-leg shrimp (Litopenaeus vannamei) owns a high market demand in Korea. This study sought to screen the frozen white-leg shrimp for Aeromonas spp. harboring antimicrobial and heavy metal resistance characteristics. A total of 44 Aeromonas spp. strains were isolated and tested for antibiotic susceptibility and heavy metal tolerance followed by PCR-based detection of resistance genes and integrons. It was observed that resistance to ampicillin and oxacillin was 100% among isolates...
May 24, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
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