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https://www.readbyqxmd.com/read/28092833/study-of-molecular-interactions-between-chitosan-and-vi-antigen
#1
Natália de Farias Silva, Raimundo Lopes da Silva, Kalene de Oliveira Almeida, Antônio Edilson Sousa do Nascimento-Júnior, Davi do Socorro Barros Brasil, José Otávio Carréra Silva-Júnior, Francisco Martins Teixeira, Roseane Maria Ribeiro-Costa
Chitosan has attracted much interest due to its special physical and chemical properties related to drug administration. Nanoparticles delivery systems from Vi Antigen are a promising approach in the struggle against typhoid fever. In this paper, we reported the obtainment and the characterization of Vi Antigen by Infrared spectroscopy as well as Molecular Modeling and Computational Chemistry studies of the Chitosan-Vi Antigen interaction through theoretical models. The results of the theoretical and experimental Infrared spectroscopy showed important bands related to N-Acetyl and O-Acetyl groups present in Vi Antigen...
December 31, 2016: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28092825/non-invasive-techniques-for-revealing-the-palette-of-the-romantic-painter-francesco-hayez
#2
Laura Rampazzi, Valentina Brunello, Cristina Corti, Elena Lissoni
This paper describes the first systematic analysis of the palette of Francesco Hayez, one of the most outstanding artists of European Romanticism, whose painting technique has never been extensively investigated despite the plethora of artistic studies. He lived in a particular moment in the history of painting, as in the first half of the 19th century many synthetic pigments were available, also in tin tubes, but traditional materials were still used. Sixteen paintings on canvas and on panels, created between 1823 and 1868, were analyzed in situ through non-invasive techniques (infrared reflectography and infrared reflection spectroscopy)...
January 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28092819/silver-nanoparticles-supported-over-mesoporous-alumina-as-an-efficient-nanocatalyst-for-n-alkylation-of-hetero-aromatic-amines-and-aromatic-amines-using-alcohols-as-alkylating-agent
#3
Priyanka Paul, Piyali Bhanja, Noor Salam, Usha Mandi, Asim Bhaumik, Seikh Mafiz Alam, Sk Manirul Islam
We have successfully embedded rhombohedral crystallites of silver nanoparticles (Ag-NPs) over mesoporous alumina (Ag@Al2O3) material for the first time. The Ag@Al2O3 has been characterized by powder X-ray diffraction (PXRD), ultra high resolution transmission electron microscopy (UHR-TEM), scanning electron microscopy (SEM), N2 adsorption/desorption isotherm, Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectra (UV-Vis), and thermogravimetric analysis (TGA). The PXRD confirms the presence of the rhombohedral phase of Ag nanoparticles...
January 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28092394/morphological-evaluation-of-meibomian-glands-in-children-and-adolescents-using-noncontact-infrared-meibography
#4
Yuan Wu, Haili Li, Yun Tang, Xiaoming Yan
PURPOSE: To compare, in vivo, differences in meibomian gland morphology between children and adolescents. METHODS: Sixty-nine patients were included in this study and divided into two groups: children (n = 31; age range: 3 to 11 years) and adolescents (n = 39; age range: 12 to 18 years). Images of meibomian glands were obtained by infrared meibography and analyzed using ImageJ software (developed by the National Institutes of Health; available at http://rsb.info...
January 13, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28092163/corrigendum-to-simultaneous-orthogonal-drug-detection-using-fully-integrated-gas-chromatography-with-fourier-transform-infrared-detection-and-mass-spectrometric-detection
#5
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28092159/probe-decomposition-of-methylammonium-lead-iodide-perovskite-in-n2-and-o2-by-in-situ-infrared-spectroscopy
#6
Xiaozhou Yu, Ying Qin, Qing Peng
Packaging methylammonium lead iodide perovskite (MAPbI3) based solar cells with a controlled gaseous atmosphere, such as N2 or dry air, is a promising solution for its application as outdoor photovoltaics. However, the effect of N2 and O2 on the decomposition chemistry and kinetics of MAPbI3 is not well understood yet. With in-situ Fourier transform infrared spectroscopy measurements, we show that the effective activation energy for the degradation of MAPbI3 in N2 is ~ 120 kJ/mol. The decomposition of MAPbI3 is greatly enhanced when MAPbI3 is exposed to O2...
January 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28092125/rattle-structured-upconversion-nanoparticles-for-near-ir-induced-suppression-of-alzheimer-s-%C3%AE-amyloid-aggregation
#7
Sukeun Kuk, Byung Il Lee, Joon Seok Lee, Chan Beum Park
Rose bengal (RB)-loaded upconverting nanocomposites are synthesized as a near-infrared (NIR)-responsive inhibitor of Aβ aggregation. Rattle-structured, organosilica shell (ROS) is deposited on NaYF4 :Yb,Er nanocrystals (UCNPs) for high loading efficiency and disaggregation of RB. RB/UCNP@ROS successfully inhibits Aβ self-assembly under NIR irradiation by generating (1) O2 . Furthermore, photoexcited RB/UCNP@ROS is effective in suppressing Aβ-induced cytotoxicity.
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092049/rosette-assay-highly-customizable-dot-blot-for-sh2-domain-screening
#8
Khong Y Ng, Kazuya Machida
With a growing number of high-throughput studies, structural analyses, and availability of protein-protein interaction databases, it is now possible to apply web-based prediction tools to SH2 domain-interactions. However, in silico prediction is not always reliable and requires experimental validation. Rosette assay is a dot blot-based reverse-phase assay developed for the assessment of binding between SH2 domains and their ligands. It is conveniently customizable, allowing for low- to high-throughput analysis of interactions between various numbers of SH2 domains and their ligands, e...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28091949/nonmechanical-infrared-beam-steering-using-blue-addressed-quantum-dot-doped-liquid-crystal-grating
#9
Xiangru Wang, Xiaoping Huang, Ziqiang Huang, Liang Wu, Jiyang Shang, Qi Qiu, Shuanghong Wu
We present a scheme of nonmechanical laser beam steering using ZnS/InP quantum dots doping nematic liquid crystal as the optical recording film. Because of its internal electric field generated by blue laser-induced charge carrier distribution, liquid crystal molecules are reoriented to form a phase grating which make the incident angle steer to the angle as we desire. Being a nonmechanical programmable laser beam steering, the anisotropy of the relative permittivity tensor and blue laser-induced electric carriers play a significant effect in determining the reorientable liquid crystal molecule and reconfigurable phase modulation of the gratings, that determines the steering angle and steering efficiency...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091663/markedly-enhanced-up-conversion-luminescence-by-combining-ir-808-dye-sensitization-and-core-shell-shell-structures
#10
Jiating Xu, Mingdi Sun, Ye Kuang, Huiting Bi, Bin Liu, Dan Yang, Ruichan Lv, Shili Gai, Fei He, Piaoping Yang
Rare-earth-doped up-conversion nanoparticles (UCNPs), which are capable of converting infrared light to shorter-wavelength photons, have attracted worldwide attention due to their unique characteristics. However, the emission brightness of UCNPs is greatly limited by the unsatisfactory absorptivity of lanthanide ions. Herein, we adopted a novel strategy to enhance the up-conversion intensity using NIR dye IR-808 as an antenna to sensitize the core-shell-shell structured NaGdF4:Yb,Er@NaGdF4:Yb@NaNdF4:Yb UCNPs...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091662/self-assembly-optical-thermal-and-electrochemical-properties-of-bis-n-benzyl-perylene-diimide-dye
#11
Devrim Ozdal, Nur P Aydinlik, Jagadeesh B Bodapati, Huriye Icil
Flexible methylene containing N,N'-bis-(benzyl)-3,4,9,10-perylenebis(dicarboximide) (1) was synthesized. Self-assembled microstructures (hollow tubes, average length and width: 7.7 and 0.8 μm) of 1 were also prepared (T-1). Comparative studies of the optical, thermal and electrochemical properties of 1 and T-1 have been extensively carried out. The T-1 hallow tubes have shown extremely broad absorption in the near-infrared (300-800 nm) region (NIR) even in solution and intensified conductivity in the solid-state compared to 1...
January 16, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28091649/optical-properties-of-trinuclear-metal-chalcogenolate-complexes-room-temperature-nir-fluorescence-in-cu2ti-sph-6-pph3-2
#12
Michael Kühn, Sergei Lebedkin, Florian Weigend, Andreas Eichhöfer
The optical properties of four isostructural trinuclear chalcogenolato bridged metal complexes [Cu2Sn(SPh)6(PPh3)2], [Cu2Sn(SePh)6(PPh3)2], [Ag2Sn(SPh)6(PPh3)2] and [Cu2Ti(SPh)6(PPh3)2] have been investigated by absorption and photoluminescence spectroscopy and time-dependent density functional theory (TDDFT) calculations. All copper-tin compounds demonstrate near-infrared (NIR) phosphorescence at ∼900-1100 nm in the solid state at low temperature, which is nearly absent at ambient temperature. Stokes shifts of these emissions are found to be unusually large with values of about 1...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091638/highly-ordered-sandwich-type-phthalocyaninato-porphyrinato-europium-double-decker-nanotubes-and-room-temperature-no2-sensitive-properties
#13
Peihua Zhu, Yucheng Wang, Pan Ma, Feifei Song, Xinyu Han, Shuncheng Yao, Cheng Yang
A sandwich-type (phthalocyaninato)(porphyrinato) europium double-decker complex Eu(TPyP){Pc-(OC8H17)8} [TPyP = meso-tetra(4-pyridyl)porphyrin; Pc-(OC8H17)8 = 2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyanine] (2) was designed and prepared. For comparative studies, Eu(TPyP)(Pc) (1) was also prepared. Highly ordered nanotubes of complexes 1 and 2 were successfully fabricated by using an anodized alumina oxide (AAO) template method. The nanotubes were comparatively investigated by electronic absorption spectra, scanning electron microscopy (SEM), low-angle X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectroscopy (EDS) techniques...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091596/non-invasive-optical-estimate-of-tissue-composition-to-differentiate-malignant-from-benign-breast-lesions-a-pilot-study
#14
Paola Taroni, Anna Maria Paganoni, Francesca Ieva, Antonio Pifferi, Giovanna Quarto, Francesca Abbate, Enrico Cassano, Rinaldo Cubeddu
Several techniques are being investigated as a complement to screening mammography, to reduce its false-positive rate, but results are still insufficient to draw conclusions. This initial study explores time domain diffuse optical imaging as an adjunct method to classify non-invasively malignant vs benign breast lesions. We estimated differences in tissue composition (oxy- and deoxyhemoglobin, lipid, water, collagen) and absorption properties between lesion and average healthy tissue in the same breast applying a perturbative approach to optical images collected at 7 red-near infrared wavelengths (635-1060 nm) from subjects bearing breast lesions...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090610/highly-dispersible-edge-selectively-oxidized-graphene-with-improved-electrical-performance
#15
Jisoo Park, Yern Seung Kim, Sae Jin Sung, Taehoon Kim, Chong Rae Park
We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml(-1)) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM)...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28090506/cystic-duct-variation-detected-by-near-infrared-fluorescent-cholangiography-during-laparoscopic-cholecystectomy
#16
Nam Seok Kim, Hyeong Yong Jin, Eun Young Kim, Tae Ho Hong
Near-infrared fluorescent cholangiography (NIRFC) is an emerging technique for easy intraoperative recognition of biliary anatomy. We present a case of cystic duct variation detected by NIRFC which had a potential risk for biliary injury if not detected. A 32-year-old female was admitted to the Seoul St. Mary's Hospital for surgery for an incidental gallbladder polyp. We performed laparoscopic cholecystectomy with NIRFC. In fluorescence mode, a long cystic duct and an accessory short hepatic duct joining to the cystic duct were found and the operation was completed safely...
January 2017: Annals of Surgical Treatment and Research
https://www.readbyqxmd.com/read/28090126/fourier-transform-infrared-absorption-spectroscopy-for-quantitative-analysis-of-gas-mixtures-at-low-temperatures-for-homeland-security-applications
#17
D C Meier, K D Benkstein, W S Hurst, P M Chu
Performance standard specifications for point chemical vapor detectors are established in ASTM E 2885-13 and ASTM E 2933-13. The performance evaluation of the detectors requires the accurate delivery of known concentrations of the chemical target to the system under test. Referee methods enable the analyte test concentration and associated uncertainties in the analyte test concentration to be validated by independent analysis, which is especially important for reactive analytes. This work extends the capability of a previously demonstrated method for using Fourier transform infrared (FT-IR) absorption spectroscopy for quantitatively evaluating the composition of vapor streams containing hazardous materials at Acute Exposure Guideline Levels (AEGL) to include test conditions colder than laboratory ambient temperatures...
May 2017: Journal of Testing and Evaluation
https://www.readbyqxmd.com/read/28089785/mechanistic-modelling-of-infrared-mediated-energy-transfer-during-the-primary-drying-step-of-a-continuous-freeze-drying-process
#18
Pieter-Jan Van Bockstal, Séverine Thérèse F C Mortier, Laurens De Meyer, Jos Corver, Chris Vervaet, Ingmar Nopens, Thomas De Beer
Conventional pharmaceutical freeze-drying is an inefficient and expensive batch-wise process, associated with several disadvantages leading to an uncontrolled end product variability. The proposed continuous alternative, based on spinning the vials during freezing and on optimal energy supply during drying, strongly increases process efficiency and improves product quality (uniformity). The heat transfer during continuous drying of the spin frozen vials is provided via non-contact infrared (IR) radiation. The energy transfer to the spin frozen vials should be optimised to maximise the drying efficiency while avoiding cake collapse...
January 12, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28089225/-effectiveness-of-an-individualised-physiotherapy-program-versus-group-therapy-on-neck-pain-and-disability-in-patients-with-acute-and-subacute-mechanical-neck-pain
#19
Leonardo Gregorio Antúnez Sánchez, María de la Casa Almeida, Jesús Rebollo Roldán, Antonio Ramírez Manzano, Rocío Martín Valero, Carmen Suárez Serrano
OBJECTIVE: To compare the efficacy in reducing neck pain and disability in an individualised physiotherapy treatment with group treatment in acute and subacute mechanical neck pain. DESIGN: Randomised clinical trial. LOCATION: Health Area of University Hospital Virgen del Rocío, Seville, Spain. PARTICIPANTS: A total of 90 patients diagnosed with mechanical neck pain of up to one month onset, distributed randomly into two groups: (i)individualised treatment; (ii)group treatment...
January 11, 2017: Atencion Primaria
https://www.readbyqxmd.com/read/28089142/bedside-monitoring-of-cerebral-energy-state-during-cardiac-surgery-a-novel-approach-utilizing-intravenous-microdialysis
#20
Simon Mölström, Troels H Nielsen, Claus Andersen, Carl H Nordström, Palle Toft
OBJECTIVES: This study investigated whether the lactate-to-pyruvate (LP) ratio obtained by microdialysis (MD) of the cerebral venous outflow reflected a derangement of global cerebral energy state during cardiopulmonary bypass (CPB). DESIGN: Interventional, prospective, randomized study. SETTING: Single-center, university teaching hospital. PARTICIPANTS: The study included 10 patients undergoing primary, elective coronary artery bypass grafting...
November 2, 2016: Journal of Cardiothoracic and Vascular Anesthesia
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