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Functional infra red spectroscopy

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https://www.readbyqxmd.com/read/28878252/efficient-bioimaging-with-diaminodicyanoquinodimethanes-selective-imaging-of-epidermal-and-stomatal-cells-and-insight-into-the-molecular-level-interactions
#1
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
https://www.readbyqxmd.com/read/28841428/a-new-polymorph-of-ciprofloxacin-saccharinate-structural-characterization-and-pharmaceutical-profile
#2
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
https://www.readbyqxmd.com/read/28816405/synthesis-density-functional-theory-calculations-and-luminescence-of-lanthanide-complexes-with-2-6-bis-3-methoxybenzylidene-hydrazinocarbonyl-pyridine-schiff-base-ligand
#3
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
https://www.readbyqxmd.com/read/28740154/ab-initio-density-functional-calculations-and-infra-red-study-of-co-interaction-with-pd-atoms-on-%C3%AE-al2o3-010-surface
#4
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
https://www.readbyqxmd.com/read/28727432/controlled-functionalization-of-gold-nanoparticles-with-mixtures-of-calix-4-arenes-revealed-by-infrared-spectroscopy
#5
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
https://www.readbyqxmd.com/read/28714204/investigation-on-the-ph-independent-photoluminescence-emission-from-carbon-dots-impregnated-on-polymer-matrix
#6
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
https://www.readbyqxmd.com/read/28698586/sensitization-energy-transfer-and-infra-red-emission-decay-modulation-in-yb-3-doped-nayf4-nanoparticles-with-visible-light-through-a-perfluoroanthraquinone-chromophore
#7
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
https://www.readbyqxmd.com/read/28679839/vibration-over-the-larynx-increases-swallowing-and-cortical-activation-for-swallowing
#8
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
https://www.readbyqxmd.com/read/28625681/variation-of-calcium-copper-and-iron-levels-in-serum-bile-and-stone-samples-of-patients-having-different-types-of-gallstone-a-comparative-study
#9
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
https://www.readbyqxmd.com/read/28573984/a-gaussian-mixture-model-based-adaptive-classifier-for-fnirs-brain-computer-interfaces-and-its-testing-via-simulation
#10
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)...
June 2, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28558892/functional-near-infra-red-spectroscopy-fnirs-in-schizophrenia-a-review
#11
REVIEW
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
https://www.readbyqxmd.com/read/28458108/mineralization-of-pyrrole-a-recalcitrant-heterocyclic-compound-by-electrochemical-method-multi-response-optimization-and-degradation-mechanism
#12
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)...
April 27, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28433922/effects-of-aging-on-prefrontal-brain-activation-during-challenging-walking-conditions
#13
Anat Mirelman, Inbal Maidan, Hagar Bernad-Elazari, Shiran Shustack, Nir Giladi, Jeffrey M Hausdorff
BACKGROUND: Deficits in cognitive domains, in particular, those related to the prefrontal cortex, contribute to diminished walking performance in complex conditions in older age. Studies using functional near infra-red spectroscopy (fNIRS) reported inconsistent findings of brain activation age-related changes in response to increased task demands. We aimed to study the effects of aging on gait and prefrontal activation in complex walking tasks with internal and external task demands. METHODS: Twenty-three healthy young adults (30...
July 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28330204/endophytic-fungal-isolate-mediated-biosynthesis-of-silver-nanoparticles-and-their-free-radical-scavenging-activity-and-anti-microbial-studies
#14
Vasudeva Reddy Netala, Venkata Subbaiah Kotakadi, Pushpalatha Bobbu, Susmila Aparna Gaddam, Vijaya Tartte
The present study reports that the biosynthesis of AgNPs using an endophytic fungus isolated from the ethnomedicinal plant Centella asiatica. The endophytic fungus was identified as Aspergillus versicolor ENT7 based on 18S rRNA gene sequencing (NCBI Accession number KF493864). The AgNPs synthesized were characterized by UV-visible spectroscopy, Fourier transform infra-red spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), particle size analyzer, and zeta potential measurements...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28296422/quantum-dynamics-and-spectroscopy-of-ab-initio-liquid-water-the%C3%A2-interplay-of-nuclear-and-electronic-quantum-effects
#15
Ondrej Marsalek, Thomas E Markland
Understanding the reactivity and spectroscopy of aqueous solutions at the atomistic level is crucial for the elucidation and design of chemical processes. However, the simulation of these systems requires addressing the formidable challenges of treating the quantum nature of both the electrons and nuclei. Exploiting our recently developed methods that provide acceleration by up to 2 orders of magnitude, we combine path integral simulations with on-the-fly evaluation of the electronic structure at the hybrid density functional theory level to capture the interplay between nuclear quantum effects and the electronic surface...
March 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28291304/mitochondrial-dysfunction-in-calf-muscles-of-patients-with-combined-peripheral-arterial-disease-and-diabetes-type-2
#16
Brian Lindegaard Pedersen, Niels Bækgaard, Bjørn Quistorff
BACKGROUND: This study elucidate the effects on muscle mitochondrial function in patients suffering from combined peripheral arterial disease (PAD) and type 2 diabetes (T2D) and the relation to patient symptoms and treatment. METHODS: Near Infra Red Spectroscopy (NIRS) calf muscle exercise tests were conducted on Forty subjects, 15 (PAD), 15 (PAD+T2D) and 10 healthy age matched controls (CTRL) recruited from the vascular outpatient clinic at Gentofte County Hospital, Denmark...
March 14, 2017: International Angiology: a Journal of the International Union of Angiology
https://www.readbyqxmd.com/read/28258037/the-role-of-zinc-deficiency-induced-changes-in-the-phospholipid-protein-balance-of-blood-serum-in-animal-depression-model-by-raman-ftir-and-uv-vis-spectroscopy
#17
J Depciuch, M Sowa-Kućma, G Nowak, B Szewczyk, U Doboszewska, M Parlinska-Wojtan
Depression is a serious mental illness. To study the mechanisms of diseases and search for new, more effective therapies, animal models are used. Unfortunately, none of the available models does reflect all symptoms of depression. Zinc deficiency is proposed as a new animal model of depression. However, it has not been yet validated in a detailed manner. Recently, spectroscopic techniques are increasingly being used both in clinical and preclinical studies. Here we examined the effect of zinc deficiency and amitryptyline treatment on the phospholipid - protein balance in the blood serum of rats using Raman, Fourier Transform Infra Red (FTIR) and UV-vis technique...
May 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27992215/infrared-spectroscopy-of-gas-phase-m-co2-n-m-co-rh-ir-ion-molecule-complexes
#18
Andreas Iskra, Alexander S Gentleman, Aras Kartouzian, Michael J Kent, Alastair P Sharp, Stuart R Mackenzie
The structures of gas-phase M(+)(CO2)n (M = Co, Rh, Ir; n = 2-15) ion-molecule complexes have been investigated using a combination of infrared resonance-enhanced photodissociation (IR-REPD) spectroscopy and density functional theory. The results provide insight into fundamental metal ion-CO2 interactions, highlighting the trends with increasing ligand number and with different group 9 ions. Spectra have been recorded in the region of the CO2 asymmetric stretch around 2350 cm(-1) using the inert messenger technique and their interpretation has been aided by comparison with simulated infrared spectra of calculated low-energy isomeric structures...
January 3, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27876382/amperometric-triglyceride-bionanosensor-based-on-nanoparticles-of-lipase-glycerol-kinase-glycerol-3-phosphate-oxidase
#19
C S Pundir, V Aggarwal
The nanoparticles (NPs) aggregates of lipase from porcine pancreas, glycerol kinase (GK) from Cellulomonas sp. and glycerol-3-phosphate oxidase (GPO) from Aerococcus viridanss were prepared by desolvation and glutaraldehyde crosslinking and functionalized by cysteamine. These enzyme nanoparticles (ENPs) were characterized by transmission electron microscopy (TEM) and Fourier transform infra red (FTIR) spectroscopy. The functionalzed ENPs aggregates were co-immobilized covalently onto polycrystalline Au electrode through thiolated bond...
January 15, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27770906/preparation-of-collagen-peptide-functionalized-chitosan-nanoparticles-by-ionic-gelation-method-an-effective-carrier-system-for-encapsulation-and-release-of-doxorubicin-for-cancer-drug-delivery
#20
S Anandhakumar, G Krishnamoorthy, K M Ramkumar, A M Raichur
In recent years, nanoparticles (NPs) based on biopolymers or peptides are gaining popularity for the encapsulation and release of drug molecules, especially for cancer therapy, due to their ability for targeted and controlled release. The use of collagen peptide (CP) for the preparation of chitosan (CN) NPs is especially interesting as it results in NPs that are stable under physiological conditions. In this work, mono-dispersed pH responsive CPCN NPs of about 100nm were prepared via ionic gelation method by simple and mild co-precipitation of CN and CP...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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