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https://www.readbyqxmd.com/read/29178783/heterogeneous-catalysis-on-demand-mechanically-controlled-catalytic-activity-of-a-metal-surface
#1
Tomasz Mazur, Slawomir Lach, Bartosz A Grzybowski
Metal surface passivated with a tightly-packed self-assembled monolayer, SAM, can be made catalytically active upon metal's mechanical deformation. This de-formation renders the SAM sparser and exposes addi-tional catalytic sites on the metal's surface. If the defor-mation is elastic, return of the metal to the original shape "heals" the SAM and nearly extinguishes catalytic activity. Kelvin Force Microscopy and theoretical con-siderations both indicate that the catalytic domains "opening up" in the deformed SAM are of nanoscopic dimensions...
November 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29108538/-upper-abdominal-pain-caused-by-oesophageal-perforation
#2
EDITORIAL
Bastian Neesgaard, Anne-Sophie Sejling, Lene Arguimbau Ostenfeld-Møller
Boerhaave's syndrome or spontaneous oesophageal perforation is associated with significant mortality de-pending on time of diagnosis and initiation of treatment. However, the diagnosis is often delayed, as the condition mimics more frequent causes of chest- and abdominal pain. This case report describes a patient with severe upper ab-dominal and back pain following ructus in an effort to loosen a piece of candy stuck in the oesophagus. The case demon-strates, that Boerhaave's syndrome should always be con-sidered in patients presenting with acute chest- or upper abdominal pain...
November 6, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/29106964/simulated-molecular-scale-interaction-of-supercritical-fluid-mobile-and-stationary-phases
#3
Paul D Siders
In supercritical fluid chromatography, molecules from the mobile phase adsorb on the stationary phase. Stationary-phase alkylsilane-terminated silica surfaces might adsorb molecules at the silica, among the silanes, on a silane layer, or in pore space between surfaces. Mobile phases of carbon dioxide, pure and modified with methanol, and stationary phases were simulated at the molecular scale. Classical atomistic force fields were used in Gibbs-ensemble hybrid Monte Carlo calculations. Excess adsorption of pure carbon dioxide mobile phase peaked at fluid densities of 0...
October 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29055735/sucrosomial%C3%A2-iron-absorption-studied-by-in-vitro-and-ex-vivo-models
#4
Angela Fabiano, Elisa Brilli, Stefano Fogli, Denise Beconcini, Sara Carpi, Germano Tarantino, Ylenia Zambito
This paper presents a comparative evaluation of different oral ferric iron formulations for ability to retain Fe(3+) in simulated gastric fluid (SGF), be internalized by cells lining intestinal epithelium, and cross it to reach the bloodstream. In all formulations iron was ferric pyrophosphate, the excipients were different types and fractions of lecithin plus sucrose esters of fatty acids matrix (Sideral® RM; PRT1; PRT2) or lecithin without sucrester (SUN). Dissolution kinetics of formulations in SGF was studied by USP method...
October 18, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29030039/effect-of-acidic-and-enzymatic-pretreatment-on-the-analysis-of-mountain-tea-sideritis-spp-volatiles-via-distillation-and-ultrasound-assisted-extraction
#5
Virginia D Dimaki, Gregoris Iatrou, Fotini N Lamari
A number of beneficial medicinal properties are attributed to the extract and essential oil of the aerial parts of Sideritis species (Lamiaceae). Hydrodistillation of the aerial parts of wild Sideritis clandestina ssp. peloponnesiaca (an endemic taxon in northern Peloponnesus, Greece) gave a low essential oil yield (<0.12%); about 65 components, mainly α-pinene, β-caryophyllene, β-pinene, globulol, caryophyllene oxide, were identified via GC-MS. Internal and external standards were used for quantification...
October 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28927300/sideritis-romana-l-subsp-purpurea-tal-ex-benth-heywood-a-new-chemotype-from-montenegro
#6
Stefania Garzoli, Mijat Božović, Anna Baldisserotto, Elisa Andreotti, Federico Pepi, Vanja Tadić, Stefano Manfredini, Rino Ragno
A study on essential oil fractions of the Western Balkan endemic Sideritis romana L. subsp. purpurea (Tal. ex Benth.) Heywood collected in Montenegro is reported. The 24-h systematic steam distillation extraction procedure was performed. The gas chromatographic/mass spectrometric (GC/MS) analysis of the fractions showed γ-elemene and spathulenol as two main constituents, revealing a new chemotype of this plant species. Although varying in the content of these two main compounds, which makes the fractions quite different between each other, evaluation of the anti-Candida activity showed the lack of any significant efficacy...
September 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28902140/iron-absorption-from-three-commercially-available-supplements-in-gastrointestinal-cell-lines
#7
Francesca Uberti, Vera Morsanuto, Sabrina Ghirlanda, Claudio Molinari
This study compares the absorption characteristics of two iron-based dietary supplements and their biocompatibility to bisglycinate iron, a common chelated iron form. The Caco-2 cell line-a model of human intestinal absorption-and GTL-16 cell line-a model of gastric epithelial cells-were used to perform the experiments; in the first experiments, the kinetics of absorption have been evaluated analyzing the divalent metal transporter 1 (DMT1) expression. Three different iron combinations containing 50 µM iron (named Fisioeme(®), Sideral(®) and bisglycinate) were used for different stimulation times (1-24 h)...
September 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28880089/pickering-membranes-stabilized-by-saturn-particles
#8
Matthias M Krejca, Cornell Wüstner, Werner A Goedel
We report on a novel method to synthesize particles-called by us Saturn particles-having two hydrophobic caps that oppose each other and are separated from each other by a hydrophilic belt that encircles the particle. Mixtures of these particles with water and air, without the usage of low molar mass surfactants, easily form Pickering foams and Pickering membranes that are stable for days. These Pickering membranes are composed of a thin film of water into which the particles are embedded in such a way that the belt is surrounded by the water and the caps protrude out of the water into the air at the top and bottom side of the water film...
October 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28877997/the-pumilio-domain-protein-puf6-contributes-to-sider2-retroposon-mediated-mrna-decay-in-leishmania
#9
Hiva Azizi, Carole Dumas, Barbara Papadopoulou
Leishmania and other trypanosomatid protozoa lack control at the level of transcription initiation and regulate gene expression exclusively post-transcriptionally. We have reported previously that Leishmania harbors a unique class of short interspersed degenerate retroposons (SIDERs) that are predominantly located within 3'UTRs and play a major role in post-transcriptional control. We have shown that members of the SIDER2 subfamily initiate mRNA decay through endonucleolytic cleavage within the second conserved 79-nt signature sequence of SIDER2 retroposons...
December 2017: RNA
https://www.readbyqxmd.com/read/28864041/abietane-diterpenoids-from-sideritis-montana-l-and-their-antiproliferative-activity
#10
Barbara Tóth, Norbert Kúsz, Peter Forgo, Noémi Bózsity, István Zupkó, Gyula Pinke, Judit Hohmann, Andrea Vasas
The present study aimed at the phytochemical and pharmacological investigation of Sideritis montana L. (Lamiaceae). Two new abietane diterpenes [sideritins A (1) and B (2)] were isolated from the methanol extract of the plant. Six known compounds [pomiferin E (3), 9α,13α-epi-dioxyabiet-8(14)-en-18-ol (4), paulownin (5), 6-methoxysakuranetin (6), 3-oxo-α-ionol (7) and 4-allyl-2,6-dimethoxyphenol glucoside (8)] were also obtained from the plant. The structures were determined by means of HREIMS and NMR experiments...
October 2017: Fitoterapia
https://www.readbyqxmd.com/read/28832536/chemical-and-antimicrobial-analyses-of-sideritis-romana-l-subsp-purpurea-tal-ex-benth-heywood-an-endemic-of-the-western-balkan
#11
Vanja Tadić, Alessandra Oliva, Mijat Božović, Alessia Cipolla, Massimiliano De Angelis, Vincenzo Vullo, Stefania Garzoli, Rino Ragno
A comprehensive study on essential oil and different solvent extracts of Sideritis romana L. subsp. purpurea (Tal. ex Benth.) Heywood (Lamiaceae) from Montenegro is reported. The gas chromatography-mass spectrometry analysis of the essential oil revealed a total of 43 components with bicyclogermacrene (23.8%), germacrene D (8%), (E)-caryophyllene (7.9%) and spathulenol (5.5%) as the major ones. Sesquiterpenoid group was found to be the most dominant one (64.8%), with 19.9% of the oxygenated forms. In the crude methanol extract of the investigated plant, obtained by Sohhlet exraction, the total phenol content was 14...
August 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28816246/climate-adaptation-past-us-floods-give-lessons-in-retreat
#12
A R Siders
No abstract text is available yet for this article.
August 16, 2017: Nature
https://www.readbyqxmd.com/read/28806106/the-authors-respond
#13
Ryan Van Meer, Karin Hohenadel, Alanna Fitzgerald-Husek, Bryna Warshawsky, Doug Sider, Brian Schwartz, Mark P Nelder
No abstract text is available yet for this article.
August 14, 2017: Health Security
https://www.readbyqxmd.com/read/28776709/allergic-contact-dermatitis-caused-by-dimethylthiocarbamylbenzothiazole-sulfide-dmtbs-in-canvas-shoes-in-search-of-the-culprit-allergen
#14
Marie L Schuttelaar, Joost M Meijer, Malin Engfeldt, Hilde Lapeere, An Goossens, Magnus Bruze, Christina Persson, Ola Bergendorff
BACKGROUND: During rubber vulcanization, new compounds can be formed. OBJECTIVES: To report a case of allergic shoe dermatitis in which the search for the allergen ultimately led to the identification of dimethylthiocarbamylbenzothiazole sulfide (DMTBS). METHODS: A female presented with eczema on her feet after wearing Sperry Top Sider® canvas sneakers. Patch testing was performed with the European baseline series, additional series, shoe materials, and extracts of shoe materials...
August 4, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28636449/zika-virus-in-ontario-evaluating-a-rapid-risk-assessment-tool-for-emerging-infectious-disease-threats
#15
Ryan Van Meer, Karin Hohenadel, Alanna Fitzgerald-Husek, Bryna Warshawsky, Doug Sider, Brian Schwartz, Mark P Nelder
To determine the Ontario-specific risk of local and travel-related Zika virus transmission in the context of a public health emergency of international concern, Public Health Ontario (PHO) completed a rapid risk assessment (RRA) on January 29, 2016, using a newly developed RRA guidance tool. The RRA concluded that risk of local mosquito-borne transmission was low, with a high risk of imported cases through travel. The RRA was updated 3 times based on predetermined triggers. An independent evaluation assessed both the application of the RRA guidance tool (process evaluation) and the usefulness of the RRA (outcome evaluation)...
May 2017: Health Security
https://www.readbyqxmd.com/read/28628163/-quantitative-structure-activity-relationship-model-for-prediction-of-cardiotoxicity-of-chemical-components-in-traditional-chinese-medicines
#16
(no author information available yet)
OBJECTIVE: Some quantitative structure-activity relationship (QSAR) models have been developed to predict cardiac toxicity of drugs, which have limited predictive power due to based on hERG channel inhibition. The objective of this study was try to develop a QSAR model based on all kinds of cardiac adverse effects, and to predict the potential cardiotoxicity of chemical components in traditional Chinese medicines (TCM). METHODS: In this study, the compounds data of all kinds of cardiac adverse reactions were selected as the training set...
June 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28495341/estimation-of-the-prevalence-of-adverse-drug-reactions-from-social-media
#17
Thin Nguyen, Mark E Larsen, Bridianne O'Dea, Dinh Phung, Svetha Venkatesh, Helen Christensen
This work aims to estimate the degree of adverse drug reactions (ADR) for psychiatric medications from social media, including Twitter, Reddit, and LiveJournal. Advances in lightning-fast cluster computing was employed to process large scale data, consisting of 6.4 terabytes of data containing 3.8 billion records from all the media. Rates of ADR were quantified using the SIDER database of drugs and side-effects, and an estimated ADR rate was based on the prevalence of discussion in the social media corpora...
June 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/28454548/effective-communication-of-public-health-guidance-to-emergency-department-clinicians-in-the-setting-of-emerging-incidents-a-qualitative-study-and-framework
#18
Yasmin Khan, Sarah Sanford, Doug Sider, Kieran Moore, Gary Garber, Eileen de Villa, Brian Schwartz
BACKGROUND: Evidence to inform communication between emergency department clinicians and public health agencies is limited. In the context of diverse, emerging public health incidents, communication is urgent, as emergency department clinicians must implement recommendations to protect themselves and the public. The objectives of this study were to: explore current practices, barriers and facilitators at the local level for communicating public health guidance to emergency department clinicians in emerging public health incidents; and develop a framework that promotes effective communication of public health guidance to clinicians during emerging incidents...
April 28, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28433576/proptosis-and-vision-loss-as-grave-complications-of-allergic-fungal-sinusitis-and-polyposis
#19
Shane A Bobart, Ves Dimov, Darby Sider, Esteban Gallego
No abstract text is available yet for this article.
June 2017: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/28408735/predicting-neurological-adverse-drug-reactions-based-on-biological-chemical-and-phenotypic-properties-of-drugs-using-machine-learning-models
#20
Salma Jamal, Sukriti Goyal, Asheesh Shanker, Abhinav Grover
Adverse drug reactions (ADRs) have become one of the primary reasons for the failure of drugs and a leading cause of deaths. Owing to the severe effects of ADRs, there is an urgent need for the generation of effective models which can accurately predict ADRs during early stages of drug development based on integration of various features of drugs. In the current study, we have focused on neurological ADRs and have used various properties of drugs that include biological properties (targets, transporters and enzymes), chemical properties (substructure fingerprints), phenotypic properties (side effects (SE) and therapeutic indications) and a combinations of the two and three levels of features...
April 13, 2017: Scientific Reports
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