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Functional infra red spectroscopy

Haq Nawaz, Muhammad Aslam Shad, Sadia Saleem, Muhammad Umar Aslam Khan, Umar Nishan, Tahir Rasheed, Muhammad Bilal, Hafiz M N Iqbal
The present study aimed to investigate the influence of microwave irradiation on the physical and functional properties of starch extracted from Nelumbo nucifera seed flour. The seed flour was obtained by manual grinding of seeds and irradiated at different microwave treatment time, i.e., 1, 2, 3, 4 and 5 min at the low-medium intensity. The starch was extracted in distilled water and dried at room temperature using a vacuum desiccator. The morphology, crystal structure, and surface parameters of starch granules were analyzed using scanning electron microscopy, X-ray diffraction, Fourier transform infra-red spectroscopy and Brunauer, Emmett and Teller surface analysis techniques...
February 21, 2018: International Journal of Biological Macromolecules
Meenakshi Sundaram Sri Abirami Saraswathi, Dipak Rana, Alagumalai Nagendran, Subbiah Alwarappan
Herein, we report the effect of the exfoliated molybdenum disulfide (eMoS2 ) nanosheets in improving the permeability and anti-fouling properties of the PEI ultra-filtration (UF) membrane using bovine serum albumin (BSA) and humic acid (HA) as model fouling agents. The PEI/eMoS2 nanocomposite membranes were prepared via phase inversion method using three different eMoS2 concentrations (0.5, 1 and 2wt%) designated as PEI-0.5, PEI-1 and PEI-2, respectively. Fourier transform infra-red spectroscopy employed to probe the surface functionalities on the membranes...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Jun Hee Kim, Mahesh Kumar Joshi, Joshua Lee, Chan Hee Park, Cheol Sang Kim
Depositing of hierarchical ZnO nanostructures on electrospun nanofibers and their proper attachment has gained significant interest for myriad applications. However, the weak attachment of such nanostructures to the nanofiber surface limits their practical applications. In this study, a simple and efficient method has been developed for preparing hierarchical ZnO nanorod deposited polyurethane (PU) nanofiber by combining electrospinning, surface functionalization and hydrothermal treatment. Electrospun PU nanofibers were coated with polydopamine (Pdopa) via dip coating method...
November 21, 2017: Journal of Colloid and Interface Science
Xin Chen, David McAteer, Cormac McGuinness, Ian Godwin, Jonathan N Coleman, Aidan R McDonald
Metallic-phase molybdenum disulfide (1T-MoS2 ) nanosheets have proven to be highly active in the hydrogen evolution reaction (HER). We describe construction of photosensitizer functionalized 1T-MoS2 by covalently tethering the molecular photosensitizer [RuII (bpy)3 ]2+ (bpy=2,2'-bipyridine) on 1T-MoS2 nanosheets. This was achieved by covalently tethering the bpy ligand to 1T-MoS2 nanosheets, and subsequent complexation with [RuII (bpy)2 Cl2 ] to yield [RuII (bpy)3 ]-MoS2 . The obtained [RuII (bpy)3 ]-MoS2 nanosheets were characterized using infra-red, electronic absorption, X-ray photoelectron, and Raman spectroscopies, X-ray powder diffraction and electron microscopy...
January 9, 2018: Chemistry: a European Journal
Dhayalan Arul, Govindasamy Balasubramani, Velramar Balasubramanian, Thillainathan Natarajan, Pachiappan Perumal
Bacteria are generally responsible for the prevalence of several diseases and pathogenic bacteria are showing increasing resistance to different antibacterials. During the present study an extremophilic bacterium-A30 isolated from the marine waters was characterized and evaluated against four multi-drug resistant (MDR) pathogens, viz; Methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The sensitivity pattern of the selected pathogens was tested with 31 antibiotics...
October 2017: Pathogens and Global Health
Meshude Akbulut Söylemez, Olgun Güven
This study presents the preparation of molecularly imprinted matrices by using radiation-induced grafting technique onto polyethylene/polypropylene (PE/PP) non-woven fabrics. Atrazine imprinted polymers were grafted onto PE/PP non-woven fabrics through the use of methacrylic acid (MAA) and ethylene glycol dimethylacrylate (EGDMA) as the functional monomer and crosslinking agent, respectively. Grafted MIPs were characterized by attenuated total reflectance Fourier transform infra-red spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), elemental analysis, scanning electron microscopy (SEM), and positron annihilation lifetime spectroscopy (PALS)...
January 2018: Journal of Molecular Recognition: JMR
Audrey Arnould, Fabrice Cousin, Léa Chabas, Anne-Laure Fameau
HYPOTHESIS: In fatty acid systems, the role of the nature of the counter-ion on their solubility is well described. However, the effect of the molar ratio (R) between the fatty acid and its counter-ion is less explored. We investigated the effect of R as a function of the temperature in aqueous solution between myristic acid and two organic amines under hydroxide form: tetramethylammonium (TMAOH) and benzyltrimethylammonium hydroxide (BTAOH). We compare with the results previously obtained for choline hydroxide as counter-ion (Arnould et al...
January 15, 2018: Journal of Colloid and Interface Science
Mathieu Gayda, Vincent Gremeaux, Louis Bherer, Martin Juneau, Joffrey Drigny, Olivier Dupuy, Gabriel Lapierre, Véronique Labelle, Annik Fortier, Anil Nigam
Chronic exercise has been shown to prevent or slow age-related decline in cognitive functions in otherwise healthy, asymptomatic individuals. We sought to assess cognitive function in a stable coronary heart disease (CHD) sample and its relationship to cerebral oxygenation-perfusion, cardiac hemodynamic responses, and [Formula: see text] peak compared to age-matched and young healthy control subjects. Twenty-two young healthy controls (YHC), 20 age-matched old healthy controls (OHC) and 25 patients with stable CHD were recruited...
2017: PloS One
N Senthilnathan, Ch G Chandaluri, T P Radhakrishnan
The enhanced fluorescence emission of diaminodicyanoquinodimethanes (DADQs) in rigid and aggregated states holds great promise for bioimaging applications. This is demonstrated through their efficient application in epidermal and stomatal imaging with selective staining of cell walls and nuclei. Major advantages include the small quantities (a few nmols) of the fluorophore required, choice of DADQs soluble in water and organic solvents, and quick staining of the specimen in buffer-free state and in buffer medium...
September 6, 2017: Scientific Reports
Pawanpreet Singh, Renu Chadha
In this study, a new polymorph of ciprofloxacin saccharinate has been thoroughly evaluated with respect to structural as well as biopharmaceutical properties. Preliminary characterization of the new polymorph was performed by differential scanning calorimetry and thermogravimetric analysis, later confirmed by Fourier transform infra-red spectroscopy. The crystal structure was determined from the powder X-ray diffraction pattern using the direct-space algorithm. It lies in the triclinic P-1 space group. It is having lattice parameters different from previously reported forms...
August 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
Ziyad A Taha, Taher S Ababneh, Ahmed K Hijazi, Qutaiba Abu-Salem, Abdulaziz M Ajlouni, Shroq Ebwany
A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis[(3-methoxy benzylidene)hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. Lanthanide complexes, Ln-L, {[LnL(NO3 )2 ]NO3 .xH2 O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er)} were prepared and characterized by elemental analysis, molar conductance, thermal analysis (TGA/DTGA), mass spectrometry (MS), Fourier transform infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Ln-L complexes are isostructural with four binding sites provided by two nitro groups along with four coordination sites for L...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Chaitanya K Narula, Lawrence F Allard, Zili Wu
The ab initio density functional theoretical studies show that energetics favor CO oxidation on single Pd atoms supported on θ-alumina. The diffuse reflectance infra-red spectroscopy (DRIFTS) results show that carbonates are formed as intermediates when single supported Pd atoms are exposed to a gaseous mixture of CO + O2. The rapid agglomeration of Pd atoms under CO oxidation conditions even at 6 °C leads to the presence of Pd particles along with single atoms during CO oxidation experiments. Thus, the observed CO oxidation has contributions from both single Pd atoms and Pd particles...
July 24, 2017: Scientific Reports
Hennie Valkenier, Volodymyr Malytskyi, Pascale Blond, Maurice Retout, Alice Mattiuzzi, Jonathan Goole, Vincent Raussens, Ivan Jabin, Gilles Bruylants
Labile ligands such as thiols and carboxylates are commonly used to functionalize AuNPs, though little control over the composition is possible when mixtures of ligands are used. It was shown recently that robustly functionalized AuNPs can be obtained through the reductive grafting of calix[4]arenes bearing diazonium groups on the large rim. Here, we report a calix[4]arene-tetradiazonium decorated by four oligo(ethylene glycol) chains on the small rim, which upon grafting gave AuNPs with excellent stability thanks to the C-Au bonds...
August 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Pichan Saheeda, Kaviladath Sabira, Mohandas Dhaneesha, Sankaran Jayaleksmi
Highly luminescent, polymer nanocomposite films based on poly(vinyl alcohol) (PVA), and monodispersed carbon dots (C-dots) derived from multiwalled carbon nanotubes (MWCNTs), as coatings on substrates as well as free standing ones are obtained via solution-based techniques. The synthesized films exhibit pH-independent photoluminescence (PL) emission, which is an advantageous property compared with the pH-dependent photoluminescence intensity variations, generally observed for the C-dots dispersed in aqueous solution...
July 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Haizhou Lu, Yu Peng, Huanqing Ye, Xianjin Cui, Jianxu Hu, Hang Gu, Andrei N Khlobystov, Mark A Green, Philip J Blower, Peter B Wyatt, William P Gillin, Ignacio Hernández
Infra-red emission (980 nm) of sub 10 nm Yb(3+)-doped NaYF4 nanoparticles has been sensitized through the excitation of 2-hydroxyperfluoroanthraquinone chromophore (1,2,3,4,5,6,7-heptafluro-8-hydroxyanthracene-9,10-dione) functionalizing the nanoparticle surface. The sensitization is achieved with a broad range of visible light excitation (400-600 nm). The overall near infra-red (NIR) emission intensity of Yb(3+) ions is increased by a factor 300 as a result of the broad and strong absorption of the chromophore compared with ytterbium's intrinsic absorption...
July 11, 2017: Scientific Reports
Rachel W Mulheren, Christy L Ludlow
Sensory input can alter swallowing control in both the cortex and brainstem. Electrical stimulation of superior laryngeal nerve afferents increases reflexive swallowing in animals, with different frequencies optimally effective across species. Here we determined 1) if neck vibration overlying the larynx affected the fundamental frequency of the voice demonstrating penetration of vibration into the laryngeal tissues, and 2) if vibration, in comparison with sham, increased spontaneous swallowing and enhanced cortical hemodynamic responses to swallows in the swallowing network...
September 1, 2017: Journal of Neurophysiology
Mustafa Khan, Tasneem Gul Kazi, Hassan Imran Afridi, Sirajuddin, Muhammad Bilal, Asma Akhtar, Sabir Khan, Salma Kadar
BACKGROUND: Epidemiological data among the human population has shown a significantly increased incidence of gallstone (GS) disease worldwide. It was studied that some essential (calcium) and transition elements (iron and copper) in bile play an important role in the development of GS. METHOD: The estimation of calcium, copper and iron were carried out in the serum, gall bladder bile and different types of GS (cholesterol, mixed and pigmented) of 172 patients, age ranged 20-55years...
June 15, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
Zheng Li, Yi-Han Jiang, Lian Duan, Chao-Zhe Zhu
OBJECTIVE: Functional near infra-red spectroscopy (fNIRS) is a promising brain imaging technology for brain-computer interfaces (BCI). Future clinical uses of fNIRS will likely require operation over long time spans, during which neural activation patterns may change. However, current decoders for fNIRS signals are not designed to handle changing activation patterns. The objective of this study is to test via simulations a new adaptive decoder for fNIRS signals, the Gaussian mixture model adaptive classifier (GMMAC)...
August 2017: Journal of Neural Engineering
Vijay Kumar, Venkataram Shivakumar, Harleen Chhabra, Anushree Bose, Ganesan Venkatasubramanian, Bangalore N Gangadhar
The research on the alterations in functional connectivity in schizophrenia has been facilitated by development of an array of functional neuroimaging techniques. Functional Near Infra Red Spectroscopy (fNIRS) is a novel diffuse optical neuromonitring method with its own advantages and limitations. The advantages of fNIRS have made it to be frequently used as a research tool by medical community in different settings. In fNIRS the property of haemoglobin to absorb near infrared light is used to measure brain activity...
June 2017: Asian Journal of Psychiatry
Ajay Devidas Hiwarkar, Seema Singh, Vimal Chandra Srivastava, Indra Deo Mall
In this study, the electrochemical (EC) oxidation of a recalcitrant heterocyclic compound namely pyrrole has been reported using platinum coated titanium (Pt/Ti) electrodes. Response surface methodology (RSM) comprising of full factorial central composite design (CCD) with four factors and five levels has been used to examine the effects of different operating parameters such as current density (j), aqueous solution pH, conductivity (k) and treatment time (t) in an EC batch reactor. Pyrrole mineralization in aqueous solution was examined with multiple responses such as chemical oxygen demand (COD) (response, Y1) and specific energy consumption (SEC) in kWh/kg of COD removed (response, Y2)...
August 1, 2017: Journal of Environmental Management
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