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Polyacrylate acid

John A Angelos, Munashe Chigerwe, Judy M Edman, John F Hess
OBJECTIVE To evaluate changes in systemic and ocular antibody responses of steers following intranasal vaccination with precipitated or partially solubilized recombinant Moraxella bovis cytotoxin (MbxA). ANIMALS 13 Angus steers with ages ranging from 318 to 389 days and weights ranging from 352 to 437 kg. PROCEDURES Steers were assigned to receive 500 μg of a precipitated (MbxA-P; n = 5) or partially solubilized (MbxA-S; 5) recombinant MbxA subunit adjuvanted with polyacrylic acid. A control group (n = 3) received the adjuvant alone...
December 2016: American Journal of Veterinary Research
Yanfen Cui, Caiyuan Zhang, Ran Luo, Huanhuan Liu, Zhongyang Zhang, Tianyong Xu, Yong Zhang, Dengbin Wang
PURPOSE: Arginine-glycine-aspartic acid (RGD)-based nanoprobes allow specific imaging of integrin αvβ3, a protein overexpressed during angiogenesis. Therefore, this study applied a novel RGD-coupled, polyacrylic acid (PAA)-coated ultrasmall superparamagnetic iron oxide (USPIO) (referred to as RGD-PAA-USPIO) in order to detect tumor angiogenesis and assess the early response to antiangiogenic treatment in human nasopharyngeal carcinoma (NPC) xenograft model by magnetic resonance imaging (MRI)...
2016: International Journal of Nanomedicine
Roya Biabanikhankahdani, Noorjahan Banu Mohamed Alitheen, Kok Lian Ho, Wen Siang Tan
Multifunctional nanocarriers harbouring specific targeting moieties and with pH-responsive properties offer great potential for targeted cancer therapy. Several synthetic drug carriers have been studied extensively as drug delivery systems but not much information is available on the application of virus-like nanoparticles (VLNPs) as multifunctional nanocarriers. Here, we describe the development of pH-responsive VLNPs, based on truncated hepatitis B virus core antigen (tHBcAg), displaying folic acid (FA) for controlled drug delivery...
November 24, 2016: Scientific Reports
P T Juliato, A T Rodrigues, R Stahlschmidt, C R T Juliato, P G Mazzola
OBJECTIVE: There is a lack of safety data supporting the use of hormone therapy in women who have had breast cancer and who have complained of genitourinary syndrome of menopause (GSM). The objective was to test the efficacy of two non-hormonal therapies for vaginal dryness. METHODS: This was a randomized trial with 52 women with breast cancer who were being treated with tamoxifen and who complained of vaginal dryness. The volunteers answered two questionnaires to evaluate sexual function (Female Sexual Function Index, FSFI) and a customized GSM questionnaire...
November 23, 2016: Climacteric: the Journal of the International Menopause Society
Thayyath S Anirudhan, F Shainy, J Christa
Polyacrylic acid-grafted-carboxylic graphene/titanium nanotube (PAA-g-CGR/TNT) composite was synthesized. It was effectively used as adsorbent as well as photocatalyst. The composite was characterized by FTIR, XRD, SEM, TEM, Surface Area Analyzer, XPS and DRS. The photocatalytic activity of PAA-g-CGR/TNT composite was evaluated on the basis of the degradation of pollutants by using sunlight. The band gap of the prepared photocatalyst was found to be 2.6eV. The removal of the antibiotic enrofloxacin (ENR) was achieved by two step mechanism based on adsorption and photodegradation...
November 6, 2016: Journal of Hazardous Materials
Merid Haile, Owais Sarwar, Robert Henderson, Ryan Smith, Jaime C Grunlan
Multilayer coatings consisting of oppositely charged polyelectrolytes have proven to be extraordinarily effective oxygen barriers but require many processing steps to fabricate. In an effort to prepare high oxygen barrier thin films more quickly, a polyelectrolyte complex coacervate composed of polyethylenimine and polyacrylic acid is prepared. The coacervate fluid is applied as a thin film using a rod coating process. With humidity and thermal post-treatment, a 2 µm thin film reduces the oxygen transmission rate of 0...
November 18, 2016: Macromolecular Rapid Communications
René Weiss, Michael B Fischer, Viktoria Weber
Lipoprotein apheresis is applied to deplete low density lipoprotein and other apolipoprotein B containing lipoproteins in patients with severe familial hypercholesterolemia, hypertriglyceridemia associated pancreatitis, or lipoprotein (a)-hyperlipoproteinemia. Anticoagulation of the extracorporeal circuit may influence cellular activation, as evidenced by a reduction of inflammatory parameters during regional citrate anticoagulation with acid citrate dextrose A (ACD-A) commonly used in whole blood lipid apheresis...
November 17, 2016: Journal of Clinical Apheresis
Ziyan Sun, Kai Cheng, Fengyu Wu, Hongguang Liu, Xiaowei Ma, Xinhui Su, Yang Liu, Liming Xia, Zhen Cheng
Grafting a robust organic shell around inorganic nanoparticles can optimize their colloidal features to dramatically improve their physicochemical properties. Here, we have developed a polymer coating procedure for providing colloidal stability to the nanoparticles and, more importantly, for applying a fast, facile fluorine-18 labeling of iron oxide nanoparticles (IONPs) for positron emission tomography (PET)/magnetic resonance (MR) dual-modality imaging. The structure of the amphiphilic polymer is based on a backbone of polyacrylic acid, conjugated with multiple oleylamines to form a comb-like branched structure...
November 18, 2016: Nanoscale
Vinícius C Brigagão, Luis F D Barreto, Kellem A S Gonçalves, Marina Amaral, Rafael P Vitti, Ana C C Neves, Laís R Silva-Concílio
STATEMENT OF PROBLEM: Despite the advances in materials and techniques, adhesion to dentin is challenging because of the complex composition of dentin's mineral, organic, and fluid phases. PURPOSE: The purpose of this in vitro study was to evaluate the bond strength of 2 different resin cements (conventional and self-adhesive) with or without previous dentin sealing and the effect of interim cement. MATERIAL AND METHODS: Forty-five molars were embedded into acrylic resin blocks and a flat dentin surface was exposed...
November 12, 2016: Journal of Prosthetic Dentistry
H Al-Sagur, S Komathi, M A Khan, A G Gurek, A Hassan
Herein, we report a scalable synthesis of multifunctional conducting polyacrylic acid (PAA) hydrogel (MFH) integrated with reduced grapheme oxide (rGO), vinyl substituted polyaniline (VS-PANI) and lutetium Phthalocyanine (LuPc2) as three dimensional robust matrix for glucose oxidase (GOx) immobilization (PAA-rGO/VS-PANI/LuPc2/GOx-MFH). We have integrated the multicomponents such as PAA with rGO, and VS-PANI through free radical polymerization using methylene bis-acrylamide, and ammonium persulphate as the cross linker and initiator...
October 19, 2016: Biosensors & Bioelectronics
Kenta Morita, Serika Miyazaki, Chiya Numako, Shinya Ikeno, Ryohei Sasaki, Yuya Nishimura, Chiaki Ogino, Akihiko Kondo
An induction of polyacrylic acid-modified titanium dioxide with hydrogen peroxide nanoparticles (PAA-TiO2/H2O2 NPs) to a tumor exerted a therapeutic enhancement of X-ray irradiation in our previous study. To understand the mechanism of the radiosensitizing effect of PAA-TiO2/H2O2 NPs, analytical observations that included DLS, FE-SEM, FT-IR, XAFS, and Raman spectrometry were performed. In addition, highly reactive oxygen species (hROS) which PAA-TiO2/H2O2 NPs produced with X-ray irradiation were quantified by using a chemiluminescence method and a EPR spin-trapping method...
October 25, 2016: Free Radical Research
Alexandre Cestari
INTRODUCTION: Amorphous aluminosilicates glasses containing fluorine, phosphorus and calcium are used as a component of the glass ionomer dental cement. This cement is used as a restorative, basis or filling material, but presents lower mechanical resistance than resin-modified materials. The Sol-Gel method is a possible route for preparation of glasses with lower temperature and energy consumption, with higher homogeneity and with uniform and nanometric particles, compared to the industrial methods Glass ionomer cements with uniform, homogeneous and nanometric particles can present higher mechanical resistance than commercial ionomers...
October 20, 2016: Journal of Dentistry
Sahadevan Rajesh, Yong Zhao, Hao Fong, Todd J Menkhaus
Nanofiltration membranes were prepared by forming multilayers of branched polyethylenimine (BPEI) and polyacrylic acid (PAA) on a polyacrylonitrile (PAN) nanofibrous mat by layer-by-layer (LbL) assembly. The degree of ionization (DI) of PAA, estimated using FTIR spectra both in the absence and presence of added salt, was shown to have a strong influence on the BPEI/PAA film growth. BPEI/PAA multilayers grew exponentially when the DI of PAA was less than 30%, or when the pH of PAA during LbL formation was less than 3...
October 21, 2016: Nanoscale
Nicole Cathcart, Neil Coombs, Ilya Gourevich, Vladimir Kitaev
In this work, we use silver decahedral nanoparticle (AgDeNP) seeds to synthesize pentagonal silver stars (AgStDeNPs) and study the sensing properties of these nanoparticles. The regrowth process of AgStDeNPs is kinetically-controlled, so the purity of the seed NPs is critical to avoid secondary deposition in the highly non-equilibrium reduction. To control the regrowth process, surface blocking with sodium polyacrylate (PANa) was implemented. PANa moderates rough silver nanostructures typically obtained by reduction with ascorbic acid...
October 21, 2016: Nanoscale
Zhi Zhao, Nasser Hamdan, Li Shen, Hanqing Nan, Abdullah Almajed, Edward Kavazanjian, Ximin He
We have developed a novel method to synthesize a hyper-branched bio-mimetic hydrogel network across a soil matrix to improve the mechanical strength of the loose soil and simultaneously mitigate potential contamination due to a harmful by-product. This method successfully yielded a hierarchical structure that possesses the water retention, ion absorption, and soil aggregation capabilities of plant root systems in a chemically controllable manner. Inspired by the robust organic-inorganic composites found in many living organisms, we have combined this hydrogel network with a calcite biomineralization process to stabilize soil...
October 20, 2016: Environmental Science & Technology
Hiroya Tauchi, Yasumoto Sakai, Noriyuki Okawa, Hanifa Faozia, Genki Mizuguchi, Takashi Yasui, Kazutake Takada, Akio Yuchi
The interactions of polyacrylates (PAs with mean molecular weight of 4.5, 25, and 250 kDa; Na(+),pa(-)) with anion exchange resins in the Br(-) form (AXRs; -R(+),Br(-)) were studied under practical conditions by reaction stoichiometry and spectroscopy. The stoichiometric or an excess amount of PA(4.5 kDa) completely replaced Br- in the AXRs of the cross-linking degree of 2 or 8%, respectively, to give (-R(+),pa(-)), due to enhancement in selectivity of carboxylate group by multiple interactions. In contrast, PA(250 kDa) exchanged Br(-) only on the surface of AXRs and did not penetrate into the resins; CO2 was involved in the system to induce exchange with CO3(2-)...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Brennan Campbell, Robert Ionescu, Maxwell Tolchin, Kazi Ahmed, Zachary Favors, Krassimir N Bozhilov, Cengiz S Ozkan, Mihrimah Ozkan
Silicon is produced in a variety of ways as an ultra-high capacity lithium-ion battery (LIB) anode material. The traditional carbothermic reduction process required is expensive and energy-intensive; in this work, we use an efficient magnesiothermic reduction to convert the silica-based frustules within diatomaceous earth (diatomite, DE) to nanosilicon (nanoSi) for use as LIB anodes. Polyacrylic acid (PAA) was used as a binder for the DE-based nanoSi anodes for the first time, being attributed for the high silicon utilization under high current densities (up to 4C)...
October 7, 2016: Scientific Reports
Sanja Jurišić, Gordan Jurišić, Hrvoje Jurić
AIM: The objective of present study was to examine influence of adhesives and methods of enamel pretreatment on the shear bond strength (SBS) of orthodontic brackets. The adhesives used were resin-reinforced glass ionomer cements-GIC (Fuji Ortho LC) and composite resin (Transbond XT). MATERIAL AND METHODS: The experimental sample consisted of 80 extracted human first premolars. The sample was divided into four equal groups, and the metal brackets were bonded with different enamel pretreatments by using two adhesives: group A-10% polyacrylic acid; Fuji Ortho LC, group B-37% phosphoric acid; Fuji Ortho LC, group C-self etching primer; Transbond XT, group D-37% phosphoric acid, primer; Transbond XT...
December 2015: Acta Stomatologica Croatica
Huiju Wang, Wenlan Song, Min Zhang, Qi Zhen, Mei Guo, Yida Zhang, Xinzhen Du
A novel titanium and nickel oxide composite nanosheets (TiO2/NiOCNSs) coating was in situ grown on a Nitinol (NiTi) wire by direct hydrothermal treatment and modified by self-assembly of trichlorophenylsilane for solid phase microextraction (SPME). TiO2/NiOCNSs were radially oriented and chemically bonded to the NiTi substrate with double-faced open access sites. Moreover the phenyl modified TiO2/NiOCNSs (TiO2/NiOCNSs-Ph) coating exhibited original surface supporting framework favorable for effective SPME. The extraction performance of TiO2/NiOCNSs-Ph coated NiTi (NiTi-TiO2/NiOCNSs-Ph) fiber was investigated for the concentration and detection of ultraviolet (UV) filters, polycyclic aromatic hydrocarbons (PAHs), phthalate acid esters and polychlorinated biphenyls coupled to HPLC with UV detection...
October 14, 2016: Journal of Chromatography. A
Naoki Nitta, Danni Lei, Hong-Ryun Jung, Daniel Gordon, Enbo Zhao, Garrett Gresham, Jeremy Cai, Igor Luzinov, Gleb Yushin
Phosphorus (P) is an abundant element that exhibits one of the highest gravimetric and volumetric capacities for Li storage, making it a potentially attractive anode material for high capacity Li-ion batteries. However, while phosphorus carbon composite anodes have been previously explored, the influence of the inactive materials on electrode cycle performance is still poorly understood. Here, we report and explain the significant impacts of polymer binder chemistry, carbon conductive additives, and an under-layer between the Al current collector and ball milled P electrodes on cell stability...
October 5, 2016: ACS Applied Materials & Interfaces
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