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https://www.readbyqxmd.com/read/28937237/selective-inhibition-of-nf-kappab-and-surfactant-therapy-in-experimental-meconium-induced-lung-injury
#1
J Kopincova, P Mikolka, M Kolomaznik, P Kosutova, A Calkovska, D Mokra
Meconium aspiration syndrome (MAS) in newborns is characterized mainly by respiratory failure due to surfactant dysfunction and inflammation. Previous meta-analyses did not prove any effect of exogenous surfactant treatment nor glucocorticoid administration on final outcome of children with MAS despite oxygenation improvement. As we supposed there is the need to intervene in both these fields simultaneously, we evaluated therapeutic effect of combination of exogenous surfactant and selective inhibitor of NF-kappaB (IKK-NBD peptide)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937234/experimental-models-of-acute-lung-injury-in-the-newborns
#2
D Mokra, A Calkovska
Acute lung injury in the preterm newborns can originate from prematurity of the lung and insufficient synthesis of pulmonary surfactant. This situation is known as respiratory distress syndrome (RDS). In the term neonates, the respiratory insufficiency is related to a secondary inactivation of the pulmonary surfactant, for instance, by action of endotoxins in bacterial pneumonia or by effects of aspirated meconium. The use of experimental models of the mentioned situations provides new information on the pathophysiology of these disorders and offers unique possibility to test novel therapeutic approaches in the conditions which are very similar to the clinical syndromes...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937232/physiology-of-nitric-oxide-in-the-respiratory-system
#3
M Antosova, D Mokra, L Pepucha, J Plevkova, T Buday, M Sterusky, A Bencova
Nitric oxide (NO) is an important endogenous neurotransmitter and mediator. It participates in regulation of physiological processes in different organ systems including airways. Therefore, it is important to clarify its role in the regulation of both airway and vascular smooth muscle, neurotransmission and neurotoxicity, mucus transport, lung development and in the. surfactant production. The bioactivity of NO is highly variable and depends on many factors: the presence and activity of NO-producing enzymes, activity of competitive enzymes (e...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937231/pulmonary-surfactant-and-bacterial-lipopolysaccharide-the-interaction-and-its-functional-consequences
#4
M Kolomaznik, Z Nova, A Calkovska
The respiratory system is constantly exposed to pathogens which enter the lungs by inhalation or via blood stream. Lipopolysaccharide (LPS), also named endotoxin, can reach the airspaces as the major component of the outer membrane of Gram-negative bacteria, and lead to local inflammation and systemic toxicity. LPS affects alveolar type II (ATII) cells and pulmonary surfactant and although surfactant molecule has the effective protective mechanisms, excessive amount of LPS interacts with surfactant film and leads to its inactivation...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937225/photoluminescence-brightening-of-isolated-single-walled-carbon-nanotubes
#5
Zhentao Hou, Todd D Krauss
Addition of dithiothreitol (DTT) to a suspension consisting of either DNA or sodium dodecyl sulfate (SDS) wrapped single-walled carbon nanotubes (SWCNTs) caused significant photoluminescence (PL) brightening from the SWCNTs, while PL quenching to different extents was observed for other surfactant-SWCNT suspensions. PL lifetime studies with high temporal resolution show that addition of DTT mitigates non-radiative decay processes, but also surprisingly increases the radiative decay rate for DNA- and SDS-SWCNTs...
September 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28936796/biosurfactants-produced-by-bacillus-subtilis-a1-and-pseudomonas-stutzeri-na3-reduce-longevity-and-fecundity-of-anopheles-stephensi-and-show-high-toxicity-against-young-instars
#6
Punniyakotti Parthipan, Raja Kumaresan Sarankumar, Anitha Jaganathan, Pandian Amuthavalli, Ranganathan Babujanarthanam, Pattanathu K S M Rahman, Kadarkarai Murugan, Akon Higuchi, Giovanni Benelli, Aruliah Rajasekar
Anopheles stephensi acts as vector of Plasmodium parasites, which are responsible for malaria in tropical and subtropical areas worldwide. Currently, malaria management is a big challenge due to the presence of insecticide-resistant strains as well as to the development of Plasmodium species highly resistant to major antimalarial drugs. Therefore, the present study focused on biosurfactant produced by two bacteria Bacillus subtilis A1 and Pseudomonas stutzeri NA3, evaluating them for insecticidal applications against malaria mosquitoes...
September 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28936523/mesoporous-zno-nanocapsules-for-the-induction-of-enhanced-antigen-specific-immunological-responses
#7
Sumbul Afroz, Himadri Medhi, Somedutta Maity, Gillipsie Minhas, Srikanth Battu, Jeevan Giddaluru, Koushi Kumar, Pradip Paik, Nooruddin Khan
The application of nanotechnology in vaccinology has fuelled rapid advancement towards the design and development of nanovaccines. Nanoparticles have been found to enhance vaccine efficacy through the spatiotemporal orchestration of antigen delivery to secondary lymphoid organs and antigen-presentation by Antigen Presenting Cells (APCs) synchronized with stimulation of innate and adaptive immune responses. Metal based nanoparticles (MNPs) have been extensively engineered for the generation of nanovaccines owing to their intrinsic adjuvant-like properties and immunomodulatory functions...
September 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28936512/magnetic-janus-particles-synthesized-using-droplet-micro-magnetofluidic-techniques-for-protein-detection
#8
V B Varma, R G Wu, Z P Wang, R V Ramanujan
Magnetic droplets on a microfluidic platform can act as micro-robots, providing wireless, remote, and programmable control. This field of droplet micro-magnetofluidics (DMMF) is useful for droplet merging, mixing and synthesis of Janus structures. Specifically, magnetic Janus particles (MJP) are useful for protein and DNA detection as well as magnetically controlled bioprinting. However, synthesis of MJP with control of the functional phases is a challenge. Hence, we developed a high flow rate, surfactant-free, wash-less method to synthesize MJP by integration of DMMF with hybrid magnetic fields...
September 22, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28934999/vortex-assisted-modified-dispersive-liquid-liquid-microextraction-of-trace-levels-of-cadmium-in-surface-water-and-groundwater-samples-of-tharparkar-pakistan-optimized-by-multivariate-technique
#9
Sooraj Nizamani, Tasneem G Kazi, Hassan I Afridi, Sehrish Talpur, Ayaz Lashari, Anjum Lashari, Jamshed Ali
A simple vortex-assisted modified dispersive liquid–liquid microextraction procedure is proposed forthe enrichment of cadmium (Cd(+2)) in surface (stored rainwater) and groundwater of the Tharparkar district in Pakistan, before analysis by flame atomic absorption spectrometry. Ammonium pyrrolidinedithiocarbamate was used as a ligand to make a hydrophobic complex of Cd(+2), which was extracted in an ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate), and the nonionic surfactant Triton X-114 was applied as a dispersing medium...
September 21, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28934172/topical-nano-and-microemulsions-for-skin-delivery
#10
REVIEW
Christofori M R R Nastiti, Thellie Ponto, Eman Abd, Jeffrey E Grice, Heather A E Benson, Michael S Roberts
Nanosystems such as microemulsions (ME) and nanoemulsions (NE) offer considerable opportunities for targeted drug delivery to and via the skin. ME and NE are stable colloidal systems composed of oil and water, stabilised by a mixture of surfactants and cosurfactants, that have received particular interest as topical skin delivery systems. There is considerable scope to manipulate the formulation components and characteristics to achieve optimal bioavailability and minimal skin irritancy. This includes the incorporation of established chemical penetration enhancers to fluidize the stratum corneum lipid bilayers, thus reducing the primary skin barrier and increasing permeation...
September 21, 2017: Pharmaceutics
https://www.readbyqxmd.com/read/28933729/structure-and-catalysis-of-fe-iii-and-cu-ii-microperoxidase-11-interacting-with-the-positively-charged-interfaces-of-lipids
#11
Tatiana Prieto, Vinicius Santana, Adrianne M M Britto, Juliana C Araujo-Chaves, Otaciro R Nascimento, Iseli L Nantes-Cardoso
Numerous applications have been described for microperoxidases (MPs) such as in photoreceptors, sensing, drugs, and hydrogen evolution. The last application was obtained by replacing Fe(III), the native central metal, by cobalt ion and inspired part of the present study. Here, the Fe(III) of MP-11 was replaced by Cu(II) that is also a stable redox state in aerated medium, and the structure and activity of both MPs were modulated by the interaction with the positively charged interfaces of lipids. Comparative spectroscopic characterization of Fe(III) and Cu(II)MP-11 in the studied media demonstrated the presence of high and low spin species with axial distortion...
July 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28932978/biobutanol-production-from-apple-pomace-the-importance-of-pretreatment-methods-on-the-fermentability-of-lignocellulosic-agro-food-wastes
#12
María Hijosa-Valsero, Ana I Paniagua-García, Rebeca Díez-Antolínez
Apple pomace was studied as a possible raw material for biobutanol production. Five different soft physicochemical pretreatments (autohydrolysis, acids, alkalis, organic solvents and surfactants) were compared in a high-pressure reactor, whose working parameters (temperature, time and reagent concentration) were optimised to maximise the amount of simple sugars released and to minimise inhibitor generation. The pretreated biomass was subsequently subjected to a conventional enzymatic treatment to complete the hydrolysis...
September 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28930637/sodium-hypochlorite-and-sodium-bromide-individualized-and-stabilized-carbon-nanotubes-in-water
#13
Xuezhu Xu, Jian Zhou, Veronica Colombo, Yangyang Xin, Ran Tao, Gilles Lubineau
Aggregation is a major problem for hydrophobic carbon nanomaterials such as carbon nanotubes (CNTs) in water because it reduces the effective particle concentrations, prevents particles from entering the medium and leads to unstable electronic device performances when a colloidal solution is used. Molecular ligands such as surfactants can help the particles to disperse, but they tend to degrade the electrical properties of CNTs. Therefore, self-dispersed particles without the need for surfactant are highly desirable...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930461/effect-of-a-swelling-agent-on-the-performance-of-ni-porous-silica-catalyst-for-ch4-co2-reforming
#14
Mohamad Hassan Amin, Putla Sudarsanam, Matthew R Field, Jim Patel, Suresh K Bhargava
Hierarchical porous materials are of great interest in various industrial applications because of their potential to overcome the mass transport limitations typically encountered for single-mode porous materials. This report describes the synthesis of a hierarchical tri-modal porous silica-based material using a 7.5 molar ratio of a relatively inexpensive non-ionic surfactant template, tri-block copolymer P123, EO20PO70EO20. The pore size distribution curve shows the presence of three types of pores with average diameters of ~8, 25 and 89 nm...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930353/interplay-between-bulk-self-assembly-interfacial-and-foaming-properties-in-a-catanionic-surfactant-mixture-of-varying-composition
#15
José Ferreira, Alesya Mikhailovskaya, Alexis Chenneviere, Frédéric Restagno, Fabrice Cousin, François Muller, Jéril Degrouard, Anniina Salonen, Eduardo F Marques
The self-aggregation, surface properties and foamability of the catanionic surfactant mixture cetyltrimethylammonium bromide (CTAB)/sodium octyl sulfonate (SOSo) have been investigated to obtain insight on the relation between bulk nanostructures, surfactant packing, and foam stability and aging. Light microscopy, SANS, cryo-TEM, DLS, surface tension, rheometry and direct photography were used to characterize mixtures with varying CTAB molar fraction, xCTAB. In the bulk, self-assembly is richer in the excess CTAB region than in the excess SOSo one...
September 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28930346/one-pot-solution-synthesis-of-shape-controlled-copper-selenide-nanostructures-and-their-potential-applications-in-photocatalysis-and-photothermal-therapy
#16
Xianwen Wang, Zhaohua Miao, Yan Ma, Huajian Chen, Haisheng Qian, Zhengbao Zha
Developing a facile and reliable method for the fabrication of transition metal chalcogenides is a vital and endless pursuit of scientific and technological disciplines. In this work, we develop a one-pot solution approach to obtain copper selenide nanostructures with different morphologies and crystal structures (Cu2Se nanoparticles, CuSe nanoplates and CuSe2 nanosheets). In comparison to previously reported methods, our method did not use expensive and very toxic raw materials. After detailed studies of reaction conditions, including temperature, reaction time, and feeding amount of surfactants and precursors, we found that the feeding ratio of precursors played a key role in the crystal structures and morphologies of the final products...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28929199/sophorolipid-production-by-yeasts-a-critical-review-of-the-literature-and-suggestions-for-future-research
#17
REVIEW
Silke Claus, Inge N A Van Bogaert
Sophorolipids are well-known biosurfactants produced by yeasts, having potential applications ranging from nanomaterials, medicine, and cosmetics to large-volume applications such as cleaning and soil remediation. Because of their environmentally friendly nature, they attained much interest during the past decades as a sustainable and ecological alternative to petroleum-derived surfactants. Stronger yet, research activities and scientific publications on the topic are ever increasing. However, often these studies lack proper producer strain identification and detailed structural product characterization...
September 19, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28929143/enhanced-stability-and-water-solubilizing-capacity-of-water-in-oil-microemulsions-based-on-protic-ionic-liquids
#18
Akhil Pratap Singh, Kaushik Kundu, Vikram Singh, Ramesh L Gardas, Sanjib Senapati
In an attempt to increase the stability and water uptake capacity of water-in-oil (W/O) microemulsions, here we study the physicochemical behavior of a series of protic ionic liquid based water/oil microemulsions, wherein solute amounts of biocompatible tetramethylguanidinium cation-based ionic liquids (ILs) are added to the aqueous phase of water-in-oil (W/O) microemulsions. FTIR and time-resolved fluorescence measurements showed an increased water uptake in these reverse micellar droplets, compared to conventional W/O microemulsions of similar compositions...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28929103/authorization-and-toxicity-of-veterinary-drugs-and-plant-protection-products-residues-of-the-active-ingredients-in-food-and-feed-and-toxicity-problems-related-to-adjuvants
#19
REVIEW
Szandra Klátyik, Péter Bohus, Béla Darvas, András Székács
Chemical substances applied in animal husbandry or veterinary medicine and in crop protection represent substantial environmental loads, and their residues occur in food and feed products. Product approval is governed differently in these two sectors in the European Union (EU), and the occurrence of veterinary drug (VD) and pesticide residues indicated by contamination notification cases in the Rapid Alert System for Food and Feed of the EU also show characteristic differences. While the initial high numbers of VD residues reported in 2002 were successfully suppressed to less than 100 cases annually by 2006 and on, the number of notification cases for pesticide residues showed a gradual increase from a low (approximately 50 cases annually) initial level until 2005 to more than 250 cases annually after 2009, with a halt occurring only in 2016...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28928527/lipase-catalyzed-transesterification-of-ethyl-butyrate-synthesis-in-n-hexane-a-kinetic-study
#20
N Annapurna Devi, G B Radhika, R J Bhargavi
Kinetics of lipase catalyzed transesterification of ethyl caprate and butyric acid was investigated. The objective of this work was to propose a reaction mechanism and develop a rate equation for the synthesis of ethyl butyrate by transesterification using surfactant coated lipase from Candida rugosa. The reaction rate could be described in terms of Michaelis-Menten equation with a Ping-Pong Bi-Bi mechanism and competitive inhibition by both the substrates. The values of kinetic parameters computed were Vmax = 2...
August 2017: Journal of Food Science and Technology
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