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https://www.readbyqxmd.com/read/28527375/surfactant-enhanced-remediation-of-polycyclic-aromatic-hydrocarbons-a-review
#1
REVIEW
Shanti Lamichhane, K C Bal Krishna, Ranjan Sarukkalige
Polycyclic aromatic hydrocarbons (PAHs) are toxic, mutagenic and carcinogenic organic compounds that are widely present in the environment. The bioremediation of PAHs is an economical and environmentally friendly remediation technique, but it is limited because PAHs have low water solubility and fewer bioavailable properties. The solubility and bioavailability of PAHs can be increased by using surfactants to reduce surface tension and interfacial tension; this method is called surfactant-enhanced remediation (SER)...
May 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28527190/tight-medial-knot-tying-may-increase-retearing-risk-after-transosseous-equivalent-repair-of-rotator-cuff-tendon
#2
Hirotaka Sano, Masako Tokunaga, Moriyuki Noguchi, Takashi Inawashiro, Taichi Irie, Hiroo Abe, A Toshimitsu Yokobori
BACKGROUND: Retearing mechanism after transosseous equivalent (TOE) rotator cuff repair has not been fully clarified yet. OBJECTIVE: The purposes of this study were to compare the stress distribution pattern in the tendon stump between knotted and knotless TOE repair and to investigate the role of suture tension applied during medial knot tying using a 3-dimensional finite element (3D-FE) method. METHODS: Both knotted and knotless TOE repairs were simulated on the 3D-FE human rotator cuff tear model...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28527081/chiari-malformation-type-1-related-headache-the-importance-of-a-multidisciplinary-study
#3
Marcella Curone, L G Valentini, I Vetrano, E Beretta, M- Furlanetto, L Chiapparini, A Erbetta, G Bussone
Chiari type 1 Malformation (CM 1) is a structural defect consisting of a displacement of the cerebellar tonsils through the foramen magnum causing obstruction of cerebrospinal fluid (CSF) outflow. CM 1 has a variety of presentation with headache being the most common symptom. The evaluation and treatment of headache related to CM 1 are often difficult, because the pain in the occipital-suboccipital region or headache that is of cough-type suggests symptomatic CM 1, but patients suffering from CM 1 can also report migraine or tension-type headache...
May 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28526751/a-new-hypothesis-for-foregut-and-heart-tube-formation-based-on-differential-growth-and-actomyosin-contraction
#4
Hadi S Hosseini, Kara E Garcia, Larry A Taber
For decades, it was commonly thought that the bilateral heart fields in the early embryo fold directly toward the midline, where they meet and fuse to create the primitive heart tube. Recent studies have challenged this view, however, suggesting that the heart fields fold diagonally. Since early foregut and heart tube morphogenesis are intimately related, this finding also raises questions concerning the traditional view of foregut formation. Here, we combine experiments on chick embryos with computational modeling to explore a new hypothesis for the physical mechanisms of heart tube and foregut formation...
May 19, 2017: Development
https://www.readbyqxmd.com/read/28526706/cardiac-hyporesponsiveness-in-severe-sepsis-is-associated-with-nitric-oxide-dependent-activation-of-g-protein-receptor-kinase
#5
Daniela Dal-Secco, Silvia DalBó, Natalia E S Lautherbach, Fábio N Gava, Mara Rubia Nunes Celes, Patricia Oliveira Benedet, Adriana H Souza, Juliana Akinaga, Vanessa Lima, Katiussia P Silva, Luiz Ricardo A Kiguti, Marcos A Rossi, Isis do Carmo Kettelhut, André Sampaio Pupo, Fernando Queiroz Cunha, Jamil Assreuy
G protein-coupled receptor kinase isoform 2 (GRK2) has a critical role in physiological and pharmacological responses to endogenous and exogenous substances. Sepsis causes an important cardiovascular dysfunction in which nitric oxide (NO) has a relevant role. The present study aimed to assess the putative effect of inducible NO synthase (NOS-2)-derived NO on the activity of GRK2 in the context of septic cardiac dysfunction. C57BL/6 mice were submitted to severe septic injury by cecal ligation and puncture (CLP)...
May 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28526086/comparison-of-fluid-balance-and-hemodynamic-and-metabolic-effects-of-sodium-lactate-versus-sodium-bicarbonate-versus-0-9-nacl-in-porcine-endotoxic-shock-a-randomized-open-label-controlled-study
#6
Thibault Duburcq, Arthur Durand, Anne-Frédérique Dessein, Joseph Vamecq, Jean-Claude Vienne, Dries Dobbelaere, Karine Mention, Claire Douillard, Patrice Maboudou, Valery Gmyr, François Pattou, Mercé Jourdain, Fabienne Tamion, Julien Poissy, Daniel Mathieu, Raphaël Favory
BACKGROUND: Sodium lactate has been shown to improve hemodynamics and avoid fluid overload. The objective of this study was to confirm a beneficial effect on fluid balance with sodium lactate infusion and to specify whether the advantage of lactate is related to a negative chloride balance, its particular metabolism, or simply its energy load. METHODS: This was an interventional, randomized, open-label, controlled experimental study. Fifteen female "large white" pigs (2 months old) were challenged with intravenous infusion of Escherichia coli endotoxin...
May 19, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28525782/the-performativity-of-numbers-in-illness-management-the-case-of-swedish-rheumatology
#7
Anna Essén, Eivor Oborn
While there is a proliferation of numerical data in healthcare, little attention has been paid to the role of numbers in constituting the healthcare reality they are intended to depict. This study explores the performativity of numbers in the microlevel management of rheumatoid disease. We draw on a study of patients' and physicians' use of the numbers in the Swedish Rheumatology Quality Registry, conducted between 2009 and 2014. We show how the numbers performed by constructing the disease across time, and by framing action...
May 10, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28525408/rebound-deformity-after-growth-modulation-in-patients-with-coronal-plane-angular-deformities-about-the-knee-who-gets-it-and-how-much
#8
Lise A Leveille, Ozan Razi, Charles E Johnston
BACKGROUND: With observed success and increased popularity of growth modulation techniques, there has been a trend toward use in progressively younger patients. Younger age at growth modulation increases the likelihood of complete deformity correction and need for implant removal before skeletal maturity introducing the risk of rebound deformity. The purpose of this study was to quantify magnitude and identify risk factors for rebound deformity after growth modulation. METHODS: We performed a retrospective review of all patients undergoing growth modulation with a tension band plate for coronal plane deformity about the knee with subsequent implant removal...
May 18, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28525334/influence-of-%C3%AE-2-and-%C3%AE-3-adrenoceptor-agonists-on-contractile-activity-of-the-porcine-myometrium-in-the-luteal-phase-and-the-first-days-of-pregnancy
#9
W Markiewicz, J J Jaroszewski
This study analysed the relaxant properties of salbutamol (β2-adrenoceptors agonist) and BRL 37344 (β3-adrenoceptors agonist) regarding the contractility of porcine myometrium on days 10-14 of the oestrous cycle (cyclic group; n = 10) and on days 3-5 of pregnancy (early pregnant group; n = 6). The activity of myometrial strips (tension, frequency and amplitude) was recorded under isometric conditions using force transducers. The contractility was assessed further following the administration of increasing concentrations of the agonists (10-9-10-4 M), both with and without β-adrenoceptor antagonists (butaxamine - a selective β2- adrenoceptor antagonist, propranolol- a non-selective β1- and β2-adrenoceptor antagonist and bupranolol - a non-selective β1-, β2- and β3-adrenoceptor antagonist) at a concentration of 10-4 M...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28525273/directional-fluid-gating-by-janus-membranes-with-heterogeneous-wetting-properties-for-selective-oil-water-separation
#10
Prashant Gupta, Balasubramanian Kandasubramanian
The rising oil seepage accidents evolved into a global issue necessitating immediate counter measure to abridge its catastrophic repercussions on sensitive marine ecosystem urging innovative techniques for effective oil/water separation. Here, we report surface tailored wettability modified superhydrophobic/superoleophilic Janus membrane by impregnating non-ionic surfactant stabilized nano-sized polytetrafluoroethylene (PTFE) dispersion polymerized via non-fluorinated processing aid onto cotton substrate using Meyer rod coating technique, exhibiting excellent separation efficiency up to 98% with various petroleum products and retaining its intrinsic properties for at least 30 recurrences...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524745/actin-cytoskeleton-regulates-functional-anchorage-migration-switch-during-t-cadherin-induced-phenotype-modulation-of-vascular-smooth-muscle-cells
#11
Agne Frismantiene, Emmanouil Kyriakakis, Boris Dasen, Paul Erne, Therese J Resink, Maria Philippova
Vascular smooth muscle cell (SMC) switching between differentiated and dedifferentiated phenotypes is reversible and accompanied by morphological and functional alterations that require reconfiguration of cell-cell and cell-matrix adhesion networks. Studies attempting to explore changes in overall composition of the adhesion nexus during SMC phenotype transition are lacking. We have previously demonstrated that T-cadherin knockdown enforces SMC differentiation, whereas T-cadherin upregulation promotes SMC dedifferentiation...
May 19, 2017: Cell Adhesion & Migration
https://www.readbyqxmd.com/read/28524269/paradoxical-perceptions-towards-the-introduction-of-assistants-in-speech-language-pathology-and-potential-impact-on-consumers
#12
Rachael O'Brien, Rebecca Mitchell, Nicole Byrne
RATIONALE AND AIM: Working with assistants has the potential to be an economically and professionally sustainable solution to workforce shortages in speech-language pathology. However, there is some resistance to the workforce redesign, and factors that determine how assistants are utilised are not well understood. The aim of this study was to understand the perceptions that engender professional resistance and identify factors that may lessen such resistance. METHOD: Semi-structured interviews were conducted with 20 speech-language pathologists (SLPs) to learn about perceptions towards implementing assistants into the profession...
May 19, 2017: Scandinavian Journal of Caring Sciences
https://www.readbyqxmd.com/read/28523153/pleural-pressure-theory-revisited-a-role-for-capillary-equilibrium
#13
Aaron R Casha, Roberto Caruana-Gauci, Alexander Manche, Marilyn Gauci, Stanley Chetcuti, Luca Bertolaccini, Marco Scarci
BACKGROUND: Theories elucidating pleural pressures should explain all observations including the equal and opposite recoil of the chest wall and lungs, the less than expected pleural hydrostatic gradient and its variation at lobar margins, why pleural pressures are negative and how pleural fluid circulation functions. METHODS: A theoretical model describing equilibrium between buoyancy, hydrostatic forces, and capillary forces is proposed. The capillary equilibrium model described depends on control of pleural fluid volume and protein content, powered by an active pleural pump...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28522581/conformational-dynamics-of-the-frameshift-stimulatory-structure-in-hiv-1
#14
Dustin B Ritchie, Tonia R Cappellano, Collin Tittle, Negar Rezajooei, Logan Rouleau, William Ka Sikkema, Michael T Woodside
Programmed ribosomal frameshifting (PRF) in HIV-1 is thought to be stimulated by a hairpin in the mRNA, although a pseudoknot-like triplex has also been proposed. Because the conformational dynamics of the stimulatory structure under tension applied by the ribosomal helicase during translation may play an important role in PRF, we used optical tweezers to apply tension to the HIV stimulatory structure and monitor its unfolding and refolding dynamics. The folding and unfolding kinetics and energy landscape of the hairpin were measured by ramping the force on the hairpin up and down, providing a detailed biophysical characterisation...
May 18, 2017: RNA
https://www.readbyqxmd.com/read/28521647/a-qualitative-investigation-of-lay-perspectives-of-diagnosis-and-self-management-strategies-employed-by-people-with-progressive-multiple-sclerosis
#15
Julia Frost, Jane Grose, Nicky Britten
This article explores how people with progressive multiple sclerosis give meaning to their experiences. It builds upon the self-management literature, which has captured the tension between the desire for retaining normalcy and the increasing burden of self-management associated with chronic disease progression. This repeat interview study is empirically grounded in 28 interviews with 14 people with progressive multiple sclerosis. We identified gender differences in diagnosis-seeking which impacted subsequent sense-making...
May 2017: Health (London)
https://www.readbyqxmd.com/read/28521277/the-spatio-temporal-mechanical-environment-of-healthy-and-injured-human-cartilage-during-sustained-activity-and-its-role-in-cartilage-damage
#16
Saeed Miramini, David W Smith, Lihai Zhang, Bruce S Gardiner
Recently we presented a computational model of articular cartilage calibrated for normal human tissue explants. This model was able to capture the transient deformation of cartilage experiencing a cyclic load. The model takes into account the tension-compression nonlinearity of the cartilage and incorporates the dependency of the compressive stiffness and fluid permeability of cartilage on the deformation-dependent aggrecan concentration in cartilage tissue. As such it represents a leading constitutive model of articular cartilage...
May 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28520734/interfacial-mechanisms-for-stability-of-surfactant-laden-films
#17
M Saad Bhamla, Chew Chai, Marco A Àlvarez-Valenzuela, Javier Tajuelo, Gerald G Fuller
Thin liquid films are central to everyday life. They are ubiquitous in modern technology (pharmaceuticals, coatings), consumer products (foams, emulsions) and also serve vital biological functions (tear film of the eye, pulmonary surfactants in the lung). A common feature in all these examples is the presence of surface-active molecules at the air-liquid interface. Though they form only molecular-thin layers, these surfactants produce complex surface stresses on the free surface, which have important consequences for the dynamics and stability of the underlying thin liquid film...
2017: PloS One
https://www.readbyqxmd.com/read/28520629/blepharoplasty-effect-on-a-described-algorithmic-approach-to-external-ptosis-repair-is-it-time-for-unbundling
#18
Tal J Rubinstein, Daniel J Repp, Bryan S Sires
PURPOSE: To investigate the effects of performing a previously described algorithmic levator resection for involutional ptosis with a blepharoplasty instead of through a small incision. METHODS: Eyelids with involutional ptosis and normal levator function were included in the study. An upper blepharoplasty was performed first. An external levator resection was then performed based on a described technique involving 2 mm resection of aponeurosis for 1 mm of desired lift, consistent tension on the aponeurosis between surgical cases, and standardized suture placement...
May 17, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28518077/inkjet-printed-polyvinyl-alcohol-multilayers
#19
Iulia Salaoru, Zuoxin Zhou, Peter Morris, Gregory J Gibbons
Inkjet printing is a modern method for polymer processing, and in this work, we demonstrate that this technology is capable of producing polyvinyl alcohol (PVOH) multilayer structures. A polyvinyl alcohol aqueous solution was formulated. The intrinsic properties of the ink, such as surface tension, viscosity, pH, and time stability, were investigated. The PVOH-based ink was a neutral solution (pH 6.7) with a surface tension of 39.3 mN/m and a viscosity of 7.5 cP. The ink displayed pseudoplastic (non-Newtonian shear thinning) behavior at low shear rates, and overall, it demonstrated good time stability...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28518073/extraction-and-characterization-of-surfactants-from-atmospheric-aerosols
#20
Barbara Nozière, Violaine Gérard, Christine Baduel, Corinne Ferronato
Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in the Earth's atmosphere, a central process in meteorology, hydrology, and for the climate system. But because specific extraction and characterization of these compounds have been lacking for decades, very little is known on their identity, properties, mode of action and origins, thus preventing the full understanding of cloud formation and its potential links with the Earth's ecosystems...
April 21, 2017: Journal of Visualized Experiments: JoVE
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