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https://www.readbyqxmd.com/read/28937607/tip-pressure-on-semicircular-specimens-in-tapping-mode-atomic-force-microscopy-in-viscous-fluid-environments
#1
Hua-Ju Shih, Ching-Liang Dai, Po-Jen Shih
Tapping mode (TM) atomic force microscopy (AFM) in a liquid environment is widely used to measure the contours of biological specimens. The TM triggers the AFM probe approximately at the resonant frequencies and controls the tip such that it periodically touches the specimen along the scanning path. The AFM probe and its tip produce a hydrodynamic pressure on the probe itself and press the specimen. The tip to specimen size ratio is known to affect the measurement accuracy of AFM, however, few studies have focused on the hydrodynamic pressure caused by the effects of specimen size...
September 22, 2017: Sensors
https://www.readbyqxmd.com/read/28937144/ubiquitous-euphorbia-is-anything-but-euphoria-for-the-eye-a-reminder-to-get-any-area-of-contact-with-the-toxic-sap-under-the-tap
#2
https://www.readbyqxmd.com/read/28936338/photochemically-active-dna-intercalating-ruthenium-and-related-complexes-insights-by-combining-crystallography-and-transient-spectroscopy
#3
Christine J Cardin, John M Kelly, Susan J Quinn
Recent research on the study of the interaction of ruthenium polypyridyl compounds and defined sequence nucleic acids is reviewed. Particular emphasis is paid to complexes [Ru(LL)2(Int)](2+) containing potentially intercalating ligands (Int) such as dipyridophenazine (dppz), which are known to display light-switching or photo-oxidising behaviour, depending on the nature of the ancillary ligands. X-ray crystallography has made a key contribution to our understanding, and the first complete survey of structural results is presented...
July 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28935825/effect-of-tapering-after-a-period-of-high-volume-sprint-interval-training-on-running-performance-and-muscular-adaptations-in-moderately-trained-runners
#4
Casper Skovgaard, Nicki Winfield Almquist, Thue Kvorning, Peter Møller Christensen, Jens Bangsbo
The effect of tapering following a period of high-volume sprint interval training (SIT) and a basic volume of aerobic training on performance and muscle adaptations in moderately trained runners was examined. Eleven (8 males, 3 females) runners (maximum oxygen uptake (VO2-max): 56.8±2.9 mL·min(-1)·kg(-1); mean±SD) conducted high-volume SIT (HV; 20 SIT sessions; 8-12 x 30-s all-out) for 40 days followed by 18 days of tapering (TAP; 4 SIT sessions; 4 x 30-s all-out). Before and after HV as well as midway through and at the end of TAP, the subjects completed a 10-km running test and a repeated running test at 90% of vVO2-max to exhaustion (RRT)...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935585/developmental-exposure-to-low-concentrations-of-two-brominated-flame-retardants-bde-47-and-bde-99-causes-life-long-behavioral-alterations-in-zebrafish
#5
Lilah Glazer, Corinne N Wells, Meghan Drastal, Kathryn-Ann Odamah, Richard E Galat, Mamta Behl, Edward D Levin
BACKGROUND: Polybrominated diphenyl ethers (PBDEs) were widely used as flame retardants until the early 2000s, mainly in home furnishings and electronics. The persistence of PBDEs in the environment leads to continued ubiquitous exposure to low levels, with infants and children experiencing higher exposures than adults. Accumulating evidence suggest that low-level exposures during early life stages can affect brain development and lead to long-term behavioral impairments. We investigated the effects of zebrafish exposure to low doses of the two prominent PBDEs; 2,2',4,4',5,-Pentabromodiphenyl ether (BDE-99) and 2,2',4,4',-Tetrabromodiphenyl ether (BDE-47), during embryo-development on short- and long-term behavioral endpoints...
September 18, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28935108/discovery-of-new-glycosidases-from-metagenomic-libraries
#6
Zach Armstrong, Peter Rahfeld, Stephen G Withers
Microorganisms routinely perform complex enzymatic transformations of natural material; thus, their enzymes have the potential to tackle medical and industrial challenges. However, a vast number of microbes are recalcitrant to cultivation. Functional screening of environmental DNA allows us to tap into the seemingly boundless diversity of enzymes encoded by microbial populations. In this chapter, we describe methods for the isolation of environmental DNA, generation of metagenomic libraries, and the functional screening of these libraries for new glycosidases...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28934777/effectiveness-of-thermal-annular-procedures-in-treating-discogenic-low-back-pain
#7
Standiford Helm Ii, Thomas T Simopoulos, Milan Stojanovic, Salahadin Abdi, Mohamed Ahamed El Terany
BACKGROUND: Discogenic low back is a distinct clinic entity characterized by pain arising from a damaged disc. The diagnosis is clouded by the controversy surrounding discography. The treatment options are limited, with unsatisfactory results from both conservative treatment and surgery. Multiple interventional therapies have been developed to treat discogenic pain, but most have not yet been validated by high quality studies.The best studied treatment for discogenic pain is the use of heat, which has been labeled as thermal intradiscal procedures (TIPs) by the Centers for Medicare and Medicaid Services (CMS)...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28934722/rice-consumption-and-squamous-cell-carcinoma-of-the-skin-in-a-united-states-population
#8
Anala Gossai, M Scot Zens, Tracy Punshon, Brian P Jackson, Ann E Perry, Margaret R Karagas
BACKGROUND: Rice contains arsenic, a known skin carcinogen. Rice intake has been associated with arsenic-related skin lesions in South Asia, but its association with skin cancers is as yet unknown. OBJECTIVES: We aimed to investigate whether rice intake contributes to urinary arsenic concentration and risk of squamous cell carcinoma (SCC) of the skin in a U.S. population. METHODS: Rice consumption was assessed using a food frequency questionnaire administered as part of a population-based case-control study of 487 SCC cases and 462 age- and gender-matched controls...
September 7, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934099/phase-imaging-and-nanoscale-energy-dissipation-of-supported-graphene-using-amplitude-modulation-atomic-force-microscopy
#9
Borislav Vasic, Aleksandar Matkovic, Rados Gajic
We investigate phase imaging of supported graphene using amplitude modulation atomic force microscopy (AFM), so called, tapping mode. The phase contrast between graphene and neighbouring substrate grows at hard tapping conditions and the contrast is enhanced compared to the topographic one. Therefore, the phase measurements could enable a high contrast imaging of graphene and related two dimensional materials and heterostructures, not achievable with conventional AFM based topographic measurements. Obtained phase maps are then transformed into energy dissipation maps which are important for graphene applications in various mechanical systems...
September 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28933478/natural-product-modulators-of-human-sensations-and-mood-molecular-mechanisms-and-therapeutic-potential
#10
REVIEW
Tomáš Pluskal, Jing-Ke Weng
Humans perceive physical information about the surrounding environment through their senses. This physical information is registered by a collection of highly evolved and finely tuned molecular sensory receptors. A multitude of bioactive, structurally diverse ligands have evolved in nature that bind these molecular receptors. The complex, dynamic interactions between the ligands and the receptors lead to changes in our sensory perception or mood. Here, we review our current knowledge of natural products and their derived analogues that interact specifically with human G protein-coupled receptors, ion channels, and nuclear hormone receptors to modulate the sensations of taste, smell, temperature, pain, and itch, as well as mood and its associated behaviour...
September 21, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28932958/sensitive-determination-of-cadmium-using-solidified-floating-organic-drop-microextraction-slotted-quartz-tube-flame-atomic-absorption-spectroscopy
#11
Erhan Akkaya, Dotse Selali Chormey, Sezgin Bakırdere
In this study, solidified floating organic drop microextraction (SFODME) by 1-undecanol was combined with slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS) for the determination of cadmium at trace levels. Formation of a complex with 4,4'-dimethyl-2,2'-bipyridine facilitated the extraction of cadmium from aqueous solutions. Several chemical variables were optimized in order to obtain high extraction outputs. Parameters such as concentration of the ligand, pH, and amount of buffer solution were optimized to enhance the formation of cadmium complex...
September 20, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28932740/tapping-the-vast-potential-of-the-data-deluge-in-small-scale-food-animal-production-businesses-challenges-to-near-real-time-data-analysis-and-interpretation
#12
Flavie Vial, Andrew Tedder
Food-animal production businesses are part of a data-driven ecosystem shaped by stringent requirements for traceability along the value chain and the expanding capabilities of connected products. Within this sector, the generation of animal health intelligence, in particular, in terms of antimicrobial usage, is hindered by the lack of a centralized framework for data storage and usage. In this Perspective, we delimit the 11 processes required for evidence-based decisions and explore processes 3 (digital data acquisition) to 10 (communication to decision-makers) in more depth...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28931996/a-modified-seated-side-tapping-test-in-which-the-arms-are-crossed-also-reflects-gait-function-in-community-dwelling-elderly
#13
Satoshi Fuchioka, Akira Iwata, Yumi Higuchi, Mari Miyake, Seiji Kanda, Toshimasa Nishiyama
[Purpose] Seated side tapping test (SST) performance is associated with mobility impairment in the elderly. Although this test was developed to assess trunk function, interpretation of its results may be confounded by the upper-limb movements in its protocol. Here, this study aimed to validate the association between trunk function and gait function by means of the Arms Crossed SST (AC-SST), a modified version of the SST in which the arms are crossed over the chest, to exclude the effects of the upper limbs...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28931990/effect-of-a-21-day-balneotherapy-program-on-blood-cell-counts-ponogen-levels-and-blood-biochemical-indexes-in-servicemen-in-sub-health-condition
#14
Li Xu, Lin Wu, Tingting Liu, Wenrong Xing, Xinsheng Cao, Shu Zhang, Zongyi Su
[Purpose] The aim of our study was to explore the changes in the blood of servicemen in sub-health conditions during a 21-day balneotherapy program. [Subjects and Methods] For this study, 129 servicemen in sub-health condition were recruited. The subjects were randomly divided into either the balneotherapy group (70) or the control group (59). Subjects in the balneotherapy group received whole-body immersion bath therapy in thermomineral water (30 min daily) for 21 days. Their blood samples were examined 1 day before and after balneotherapy...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28931148/previous-exposure-in-a-high-risk-area-for-travellers-diarrhoea-within-the-past-year-is-associated-with-a-significant-protective-effect-for-travellers-diarrhoea-a-prospective-observational-cohort-study-in-travellers-to-south-asia
#15
Esther Kuenzli, David Juergensen, Kerstin Kling, Veronika K Jaeger, Susan DeCrom, Robert Steffen, Andreas F Widmer, Manuel Battegay, Christoph Hatz, Andreas Neumayr
Background: Travellers' diarrhoea is the most common health problem in travellers. Depending on the region visited, up to 40% of travellers develop diarrhoea during a 2-week trip. The aim of this study was to assess risk factors for TD among travellers to the Indian subcontinent. Methods: An observational prospective multicentre cohort study investigated travellers to the Indian subcontinent. Participants completed questionnaires assessing the incidence of travellers' diarrhoea and identifying potential risk factors...
September 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28931134/risk-activities-and-pre-travel-health-seeking-practices-of-notified-cases-of-imported-infectious-diseases-in-australia
#16
Prakash Paudel, C Raina, Nicholas Zwar, Holly Seale, Heather Worth, Mohamud Sheikh, Anita E Heywood
Background: Travellers are at risk of acquiring infectious diseases during travel, with risks differing by destination, travel and traveller characteristics. A pre-travel health consultation may minimize this risk. However, uptake of pre-travel health advice remains low. We investigated pre-travel health preparations and disease-specific risk behaviours among notified cases of selected travel-associated infectious diseases imported into Australia. Methods: Prospective enhanced surveillance of notified cases of typhoid, paratyphoid, measles, hepatitis A, hepatitis E, malaria and chikungunya was conducted in two Australian states between February 2013 and January 2014...
September 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28930315/mapping-the-interaction-sites-of-mucin-1-and-dna-aptamer-by-atomic-force-microscopy
#17
Nan Wang, Miaomiao Zhang, Xuejuan Chen, Xingxing Ma, Chen Li, Zhe Zhang, Jilin Tang
Mucin 1 (MUC1) is an attractive tumor marker for cancer diagnosis. An advanced atomic force microscopy (AFM) mode, peak-force tapping AFM with an aptamer functionalized tip, was introduced to map the specific interaction sites of an aptamer and MUC1. Single molecular force spectroscopy (SMFS) was used to investigate dynamic parameters of the aptamer-MUC1.
September 20, 2017: Analyst
https://www.readbyqxmd.com/read/28930256/vetiver-essential-oil-in-cosmetics-what-is-new
#18
Pauline Burger, Anne Landreau, Marie Watson, Laurent Janci, Viviane Cassisa, Marie Kempf, Stéphane Azoulay, Xavier Fernandez
Background: Vetiver is a key ingredient for the perfume industry nowadays. However, with the constant and rapid changes of personal tastes, this appeal could vanish and this sector could decline quite quickly. New dissemination paths need to be found to tap this valuable resource. Methods: In this way, its potential use in cosmetics either as an active ingredient per se (with cosmeceutical significance or presenting antimicrobial activity) has hence been explored in vitro. Results: In this contribution, we demonstrated that vetiver essential oil displays no particularly significant and innovative cosmetic potential value in formulations apart from its scent already largely exploited...
June 16, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28929915/is-synovitis-detected-on-non-contrast-enhanced-magnetic-resonance-imaging-associated-with-serum-biomarkers-and-clinical-signs-of-effusion-data-from-the-osteoarthritis-initiative
#19
L A Deveza, V B Kraus, J E Collins, A Guermazi, F W Roemer, M C Nevitt, D J Hunter
OBJECTIVES: To determine the relationship between synovitis detected on non-contrast-enhanced (non-CE) magnetic resonance imaging (MRI), biochemical markers of inflammation, and clinical assessment of effusion in people with knee osteoarthritis (OA). METHOD: We examined data from the OA Biomarkers Consortium within the Osteoarthritis Initiative (n = 600). Non-CE MRIs were semi-quantitatively scored (grades 0-3) for severity of Hoffa synovitis and effusion synovitis...
September 20, 2017: Scandinavian Journal of Rheumatology
https://www.readbyqxmd.com/read/28928585/postoperative-analgesic-efficacy-of-bilateral-transversus-abdominis-plane-block-in-patients-undergoing-midline-colorectal-surgeries-using-ropivacaine-a-randomized-double-blind-placebo-controlled-trial
#20
Nahida Qazi, Wasim Mohammad Bhat, Malik Zaffar Iqbal, Anisur Rehman Wani, Showkat A Gurcoo, Sahir Rasool
BACKGROUND: Ultrasound-guided transversus abdominis plane (TAP) block is done as a part of multimodal analgesia for pain relief after abdominal surgeries. This prospective randomized, double-blind, placebo-controlled trial was conducted to evaluate the postoperative analgesic efficacy of bilateral TAP block in patients undergoing midline colorectal surgeries using ropivacaine. MATERIALS AND METHODS: Eighty patients scheduled for elective colorectal surgeries involving midline abdominal wall incision under general anesthesia were enrolled in this prospective randomized controlled trial...
July 2017: Anesthesia, Essays and Researches
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