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https://www.readbyqxmd.com/read/28727605/in-vitro-compatibility-of-contact-lenses-with-corneal-epithelial-cells
#1
Ajay K Vijay, Zohra Fadli, Carol Lakkis, Chantal Coles-Brennan, Mark D P Willcox
PURPOSE: To determine the interaction of contact lenses of different materials with corneal epithelial cells grown in tissue culture. METHODS: Two different corneal epithelial cell lines were grown to confluence in culture media. Two hydrogel contact lenses with and without polyvinylpyrrolidone (PVP) {1-DAY ACUVUE MOIST (1-Day ACUVUE [hydrogel lenses]) and a silicone hydrogel contact lens, AIR OPTIX NIGHT & DAY} were removed from their blister packs, washed in phosphate-buffered saline, and applied to the cells...
July 18, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28717543/outcome-analysis-of-transurethral-resection-versus-potassium-titanyl-phosphate-photo-selective-vaporization-of-the-prostate-for-the-treatment-of-benign-prostatic-hyperplasia-a-randomized-controlled-trial-with-4-years-follow-up
#2
Bimalesh Purkait, Rahul Janak Sinha, Krishna Swamy A Srinivas, Ankur Bansal, Ashok Kumar Sokhal, Vishwajeet Singh
OBJECTIVE: Photovaporization of prostate (PVP) is a newer surgical modality of benign prostatic hyperplasia (BPH) which is gaining importance recently. There are a few randomized controlled trials that showed safety and efficacy of PVP in comparison with transurethral resection of prostate (TURP) with limited follow-up period (<2 years). Here, we are presenting a comparative study performed on potassium titanyl phosphate (KTP) PVP laser versus TURP for the treatment of BPH with long-term follow-up period...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28715369/electrospinning-of-photocatalytic-electrodes-for-dye-sensitized-solar-cells
#3
Nicolò Canever, Fraser Hughson, Thomas J Macdonald, Thomas Nann
This work demonstrates a protocol to fabricate a fiber-based photoanode for dye-sensitized solar cells, consisting of a light-scattering layer made of electrospun titanium dioxide nanofibers (TiO2-NFs) on top of a blocking layer made of commercially available titanium dioxide nanoparticles (TiO2-NPs). This is achieved by first electrospinning a solution of titanium (IV) butoxide, polyvinylpyrrolidone (PVP), and glacial acetic acid in ethanol to obtain composite PVP/TiO2 nanofibers. These are then calcined at 500 °C to remove the PVP and to obtain pure anatase-phase titania nanofibers...
June 28, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28714110/poly-vinylpyrollidone-and-selenocysteine-modified-bi2-se3-nanoparticles-enhance-radiotherapy-efficacy-in-tumors-and-promote-radioprotection-in-normal-tissues
#4
Jiangfeng Du, Zhanjun Gu, Liang Yan, Yuan Yong, Xuan Yi, Xiao Zhang, Jing Liu, Renfei Wu, Cuicui Ge, Chunying Chen, Yuliang Zhao
The development of a new generation of nanoscaled radiosensitizers that can not only enhance radiosensitization of tumor tissues, but also increase radioresistance of healthy tissue is highly desirable, but remains a great challenge. Here, this paper reports a new versatile theranostics based on poly(vinylpyrollidone)- and selenocysteine-modified Bi2 Se3 nanoparicles (PVP-Bi2 Se3 @Sec NPs) for simultaneously enhancing radiotherapeutic effects and reducing the side-effects of radiation. The as-prepared nanoparticles exhibit significantly enhanced free-radical generation upon X-ray radiation, and remarkable photothermal effects under 808 nm NIR laser irradiation because of their strong X-ray attenuation ability and high NIR absorption capability...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713885/synergistic-effect-of-au-ag-nano-alloying-intense-seira-and-enhanced-catalysis
#5
Manoj Verma, M Boazbou Newmai, P Senthil Kumar
The well-known AuAg nanohybrid system was effectively synthesized, utilizing polyvinyl pyrrolidone (PVP) as a multiple metal precursor reducing agent (based solely on their reduction potentials), thereby drastically decreasing their activation energy of diffusion and readily facilitating the homogenous alloy nanoparticle formation, duly confirmed by Vegard's law. Furthermore, the crucial parameters in determining the local electric field enhancement in the vicinity of the alloy nanoparticles such as the quality factor Q, dephasing time, T2 and the homogenous line width Γ were also evaluated in a systematic manner, in correlation with their unique visible optical absorption spectra...
July 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28713674/intraoperative-adjuncts-for-malignant-pleural-mesothelioma
#6
REVIEW
Warren Ho Chan, David J Sugarbaker, Bryan M Burt
Malignant pleural mesothelioma (MPM) is a rapidly fatal disease. Multimodality surgically based therapies may extend survival in select patients, however, local relapse after resection is common. Novel intraoperative adjunctive therapies including heated intraoperative chemotherapy (HIOC), heated intraoperative povidone-iodine (PVP-I), and photodynamic therapy (PDT) target micrometastatic disease and aim to improve local control. This review details the most recent studies and trials of HIOC, heated intraoperative PVP-I, and PDT, this aims to provide an update on some of the most promising intraoperative adjuncts for patients with MPM...
June 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28708606/effect-of-hydroxypropyl-cellulose-hpc-polyvinylpyrrolidone-pvp-and-polyethylene-glycol-peg-on-nd-tio2-graphene-oxide-nanocomposite-for-removal-of-lead-ii-and-copper-ii-from-aquatic-media
#7
Susan Samadi, Sayed Mohammad Hosain Mirseyfifard, Mina Assari, Marzieh Hassannejad
In order to investigate the effect of hydroxypropyl cellulose (HPC), polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) on adsorbing capacity of nanosorbent Nd-TiO2/GO, Nd-TiO2/HPC/GO, Nd-TiO2/PVP/GO and Nd-TiO2/PEG/GO nanocomposites were synthesized. Studies by Fourier transform infrared spectroscopy confirmed the expected structure and X-ray diffraction results confirmed the formation of crystalline phase of anatase titania and also graphene oxide (GO). Scanning electron microscopy pictures and energy dispersive X-ray spectroscopy analysis showed the formation of Nd-TiO2 nanoparticles...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28707872/povidone-iodine-based-polymeric-nanoparticles-for-antibacterial-applications
#8
Tianyi Gao, Hongbo Fan, Xinjie Wang, Yangyang Gao, Wenxin Liu, Wanjun Chen, Alideertu Dong, Yan-Jie Wang
As microbial contamination is becoming more and more serious, antibacterial agents play an important role in preventing and removing bacterial pathogens from microbial pollution in our daily life. To solve water solubility and antibacterial stability of PVP-I2 as a strong antibacterial agent, we successfully obtain hydrophobic povidone-iodine nanoparticles (povidone-iodine NPs) by a two-step method related to the advantage of nanotechnology. Firstly, the synthesis of poly(N-vinyl-2-pyrrolidone-co-methyl methacrylate) nanoparticles, i...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28702816/enhancing-the-solubility-of-fenofibrate-by-nanocrystal-formation-and-encapsulation
#9
Raj Kumar, Prem Felix Siril
Development of techniques to enhance bioavailability of drugs having poor water solubility is a big challenge for pharmaceutical industry. Solubility can be enhanced by particle size reduction and encapsulation using hydrophilic polymers. Fenofibrate (FF) is a drug for regulating lipids. Multi-fold enhancement in solubility of FF has been achieved by nanocrystal formation in the present study. Nanoparticles were prepared by an evaporation-assisted solvent-antisolvent interaction (EASAI) approach. Water-soluble polymers, viz...
July 12, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28698076/synthesis-and-characterization-of-chitosan-pvp-nanocellulose-composites-for-in-vitro-wound-dressing-application
#10
R Poonguzhali, S Khaleel Basha, V Sugantha Kumari
Biocompatible Chitosan/Poly (vinyl pyrrolidone)/Nanocellulose (CPN) composites were successfully prepared by solution casting method. The prepared bionanocomposites were characterized by Transmission electron microscopy (TEM), Thermo gravimetric analysis (TGA), X-ray diffraction (XRD) and Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) spectra. TEM images revealed the average particle size of the nanocellulose is 6.1nm. Thermogravimetric analysis indicated that the thermal stability of the composites was decreased with increasing concentration of nanocellulose...
July 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28694355/peripheral-venous-pressure-measurements-in-patients-with-acute-decompensated-heart-failure-pvp-hf
#11
Brett W Sperry, Joseph Campbell, Marat Yanavitski, Samir Kapadia, W H Wilson Tang, Mazen Hanna
BACKGROUND: Accurate assessment of volume status is essential in diagnosis and guidance of decongestive therapy in patients with acute heart failure. We sought to compare peripheral venous pressure (PVP) with central venous pressure (CVP), as well as other invasive hemodynamic measurements, in patients hospitalized with an acute heart failure syndrome. METHODS AND RESULTS: PVP-HF (Peripheral Venous Pressure Measurements in Patients With Acute Decompensated Heart Failure) was a single-center prospective study, which enrolled patients admitted with acute heart failure, regardless of ejection fraction or disease pathogenesis...
July 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28693953/cryopreservation-of-luciola-praeusta-kiesenwetter-coleoptera-lampyridae-embryos-by-vitrification
#12
Kang Li, Xuanli Chen, Xiaoling Song, Xi Wu, Yi Xian
There is an urgent need to preserve the ever-decreasing number of different species of fireflies all over the world. We sought to develop a vitrification procedure to cryopreserve the firefly embryos. The late stages of Luciola praeusta Kiesenwetter embryos were collected. Several impermeable and permeable protectants with various concentrations in different mediums (TNM-FH insect medium, Grace's medium, Dulbecco's Modification of Eagle's Medium (DMEM) and Dulbecco's Phosphate-Buffered Saline (DPBS)) was used...
July 7, 2017: Cryobiology
https://www.readbyqxmd.com/read/28690833/effect-of-pvp-on-the-characteristic-of-modified-membranes-made-from-waste-pet-bottles-for-humic-acid-removal
#13
Nasrul Arahman, Afrillia Fahrina, Sastika Amalia, Rahmat Sunarya, Sri Mulyati
Background: The aim of the present study was to evaluate the possibility of using recycled polymer (waste polyethylene terephthalate [PET] bottles) as a membrane material. Furthermore, the effect of the addition of a pore-forming agent and preparation conditions was also observed. Methods: Porous polymeric membranes were prepared via thermally induced phase separation by dissolving recycled PET in phenol. PET polymer was obtained from waste plastic bottles as a new source of polymeric material. For original PET membrane, the casting solution was prepared by dissolving of 20wt% PET in phenol solution...
2017: F1000Research
https://www.readbyqxmd.com/read/28690739/percutaneous-vertebroplasty-in-moroccan-patients-with-vertebral-compression-fractures
#14
Mustapha Hemama, Nizar El Fatemi, Rachid Gana
Incidence of vertebral compression fractures (VCFs) is increasing due to the increase in human life expectancy and prevalence of osteoporosis. Percutaneous vertebroplasty (PVP) has become a widely used alternative treatment for symptomatic VCFs refractory to medical therapy. It is a minimally invasive technique involving injection most frequently of polymethylmethacrylate (PMMA) directly into the vertebral body through the pedicles. Percutaneous vertebroplasty yields good results in terms of early vertebral stabilization and prompt pain relief...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28685107/optical-response-of-heterogeneous-polymer-layers-containing-silver-nanostructures
#15
Miriam Carlberg, Florent Pourcin, Olivier Margeat, Judikaël Le Rouzo, Gérard Berginc, Rose-Marie Sauvage, Jörg Ackermann, Ludovic Escoubas
This work is focused on the study of the optical properties of silver nanostructures embedded in a polymer host matrix. The introduction of silver nanostructures in polymer thin films is assumed to result in layers having adaptable optical properties. Thin film layers with inclusions of differently shaped nanoparticles, such as nanospheres and nanoprisms, and of different sizes, are optically characterized. The nanoparticles are produced by a simple chemical synthesis at room temperature in water. The plasmonic resonance peaks of the different colloidal solutions range from 390 to 1300 nm...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28681332/association-of-silver-nanoparticles-and-curcumin-solid-dispersion-antimicrobial-and-antioxidant-properties
#16
Thais Francine Alves, Marco V Chaud, Denise Grotto, Angela Faustino Jozala, Raksha Pandit, Mahendra Rai, Carolina Alves Dos Santos
The last century, more precisely after 1945, was marked by major advances in the treatment of infectious diseases which promoted a decrease in mortality and morbidity. Despite these advances, currently the development of antimicrobial resistance has been growing drastically and therefore there is a pressing need to search for new compounds. Silver nanoparticles (AgNps) have been demonstrating good antimicrobial activity against different bacteria, viruses, and fungi. Curcumin (CUR) extracted from rhizomes of Curcuma longa has a variety of applications including antiinflammatory, antioxidant, and antibacterial agent...
July 5, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28677032/molecular-mechanism-of-polymer-assisting-supersaturation-of-poorly-water-soluble-loratadine-based-on-experimental-observations-and-molecular-dynamic-simulations
#17
Shenwu Zhang, Mengchi Sun, Yongshan Zhao, Xuyang Song, Zhonggui He, Jian Wang, Jin Sun
Polymers have been usually used to retard nucleation and crystal growth in order to maintain supersaturation, yet their roles in inhibition of nucleation and crystal growth are poorly understood. In our work, the polymer-based supersaturation performances and molecular mechanisms of poorly aqueous soluble loratadine were investigated. Two common hydrophilic polymers (hydroxylpropylmethyl cellulose acetate succinate (HPMC-AS) and poly(vinylpyrrolidone-co-vinyl-acetate) (PVP-VA)) were used. It was found that HPMC-AS was a better polymer to prevent drug molecules from aggregation and to maintain the supersaturated state in solution than PVP-VA...
July 5, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28672969/comparative-study-on-the-biomechanics-between-improved-pvp-and-traditional-pkp-in-the-treatment-of-vertebral-peripheral-wall-damage-type-ovcf
#18
Tao Zhou, Hao Lin, Hongliang Wang, Xiaoqiang Chen, Fang He
We compared the biomechanics between improved percutaneous vertebroplasty (improved PVP) and traditional percutaneous kyphoplasty (PKP) in the treatment of vertebral peripheral wall damage-type osteoporotic vertebral compression fracture (OVCF). A total of 15 vertebral peripheral wall damage-type OVCF models of new calves (12-14 weeks) were treated with a decalcifying agent (Shandon TBD-1) with the vertebral compression fracture. The vertebral volume and anterior height before modeling, and the vertebral BMD before and after modeling were measured...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28671603/interleukin-10-conjugation-to-carboxylated-pvp-coated-silver-nanoparticles-for-improved-stability-and-therapeutic-efficacy
#19
Dieudonné R Baganizi, Elijah Nyairo, Skyla A Duncan, Shree R Singh, Vida A Dennis
Interleukin-10 (IL-10) is a key anti-inflammatory and immunosuppressive cytokine and therefore represents a potential therapeutic agent especially in inflammatory diseases. However, despite its proven therapeutic efficacy, its short half-life and proteolytic degradation in vivo combined with its low storage stability have limited its therapeutic use. Strategies have been developed to overcome most of these shortcomings, including in particular bioconjugation with stabilizing agents such as polyethylene glycol (PEG) and poly (vinylpyrolidone) (PVP), but so far these have had limited success...
July 2, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28665108/stretchable-polymer-dielectrics-for-low-voltage-driven-field-effect-transistors
#20
Chien Lu, Wen-Ya Lee, Chien-Chung Shih, Min-Yu Wen, Wen-Chang Chen
A stretchable and mechanical robust field-effect transistor is essential for soft wearable electronics. To realize stretchable transistors, elastic dielectrics with small current hysteresis, high elasticity, and high dielectric constants are the critical factor for low-voltage-driven devices. Here, we demonstrate the polar elastomer consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP):poly(4-vinylphenol) (PVP). Owing to the high dielectric constant of PVDF-HFP, the device can be operated under less than 5 V and shows a linear-regime hole mobility as high as 0...
July 18, 2017: ACS Applied Materials & Interfaces
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