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Functional infra red spectroscopy

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https://www.readbyqxmd.com/read/28458108/mineralization-of-pyrrole-a-recalcitrant-heterocyclic-compound-by-electrochemical-method-multi-response-optimization-and-degradation-mechanism
#1
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
#2
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...
April 20, 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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/27746801/developing-pericarp-of-maize-a-model-to-study-arabinoxylan-synthesis-and-feruloylation
#10
Anne-Laure Chateigner-Boutin, José J Ordaz-Ortiz, Camille Alvarado, Brigitte Bouchet, Sylvie Durand, Yves Verhertbruggen, Yves Barrière, Luc Saulnier
Cell walls are comprised of networks of entangled polymers that differ considerably between species, tissues and developmental stages. The cell walls of grasses, a family that encompasses major crops, contain specific polysaccharide structures such as xylans substituted with feruloylated arabinose residues. Ferulic acid is involved in the grass cell wall assembly by mediating linkages between xylan chains and between xylans and lignins. Ferulic acid contributes to the physical properties of cell walls, it is a hindrance to cell wall degradability (thus biomass conversion and silage digestibility) and may contribute to pest resistance...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27721503/mhda-functionalized-multiwall-carbon-nanotubes-for-detecting-non-aromatic-vocs
#11
Atef Thamri, Hamdi Baccar, Claudia Struzzi, Carla Bittencourt, Adnane Abdelghani, Eduard Llobet
The chemical modification of multiwalled carbon nanotubes (MWCNTs) with a long chain mercapto acid is reported as a way to improve sensitivity and response time of gas sensors for detecting alcohols, acetone and toxic gases such as DMMP. We have developed sensors employing MWCNTs decorated with gold nanoparticles and modified with a 16-mercaptohexadecanoic acid (MHDA) monolayer. Morphological and compositional analysis by Transmission Electron Microscopy (TEM), Fourier Transform Infra-red Spectroscopy (FTIR) and X-ray photoelectron spectroscopy were performed to characterize the gold nanoparticles and to check the bonding of the thiol monolayer...
October 10, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27718213/whole-resting-cells-vs-cell-free-extracts-of-candida-parapsilosis-atcc-7330-for-the-synthesis-of-gold-nanoparticles
#12
Saravanan Krishnan, Shoba Narayan, Anju Chadha
The cell free extracts of Candida parapsilosis ATCC 7330 are more efficient than the whole resting cells of the yeast in the synthesis of directly usable gold nanoparticles as revealed by this systematic study. Cell free extracts yielded gold nanoparticles of hydrodynamic diameter (50-200 nm). In this study, the total protein concentration influences the nanofabrication and not only the reductase enzymes as originally thought. Powder X-ray diffraction studies confirm the crystalline nature of the gold nanoparticles...
December 2016: AMB Express
https://www.readbyqxmd.com/read/27622989/biocompatible-silver-nanoparticles-reduced-from-anethum-graveolens-leaf-extract-augments-the-antileishmanial-efficacy-of-miltefosine
#13
Suresh K Kalangi, A Dayakar, D Gangappa, R Sathyavathi, R S Maurya, D Narayana Rao
Despite the existence of chemotherapy, there is no effective cure for leishmaniasis. In the light of recommended therapeutic regimen is attributed for toxicity and development of clinical resistance, exploration of an efficient method of drug delivery could be one of the option in reducing the dosage and toxicity of drugs. This work is aimed in such fashion to study the enhanced antileishmanial activity of miltefosine with silver-nanoparticles (AgNPs) synthesized by using Anethum graveolens (dill) leaf extract as reducing agent...
November 2016: Experimental Parasitology
https://www.readbyqxmd.com/read/27614042/phospholipid-protein-balance-in-affective-disorders-analysis-of-human-blood-serum-using-raman-and-ftir-spectroscopy-a-pilot-study
#14
Joanna Depciuch, Magdalena Sowa-Kućma, Gabriel Nowak, Dominika Dudek, Marcin Siwek, Krzysztof Styczeń, Magdalena Parlińska-Wojtan
Raman and FTIR (Fourier Transform Infra Red) spectroscopies provide information on the chemical structure of compounds through identification and analysis of functional groups. In the present study, both spectroscopic techniques were used for investigating the phospholipid - protein balance in blood serum of depressed subjects (major depressive disorder and bipolar disorder type I or II) taking also into account their age and gender. The obtained results were compared with those of healthy subjects. The Raman and FTIR (using ATR (Attenuated Total Reflectance) technique), spectra show that a correlation between the level of phospholipids and proteins exists...
November 30, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27569449/application-of-banana-peels-nanosorbent-for-the-removal-of-radioactive-minerals-from-real-mine-water
#15
Opeyemi A Oyewo, Maurice S Onyango, Christian Wolkersdorfer
Transformation of agricultural waste such as banana peels into a valuable sorbent material has been proven effective and efficient in wastewater treatment. Further, transformation into nanosorbent to enhance the removal capacity of actinides (uranium and thorium) from synthetic and real mine water is extensively investigated in this study. The nanosorbent samples before and after adsorption were characterised by X-ray diffraction (XRD), Fourier transform infra-red (FTIR), zetasizer nanoseries and scanning electron microscopy (SEM) while the amount of radioactive substances adsorbed was determined by inductively coupled plasma optical emission spectroscopy...
November 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27527179/a-review-origins-of-the-dielectric-properties-of-proteins-and-potential-development-as-bio-sensors
#16
REVIEW
Fabien Bibi, Maud Villain, Carole Guillaume, Brice Sorli, Nathalie Gontard
Polymers can be classified as synthetic polymers and natural polymers, and are often characterized by their most typical functions namely their high mechanical resistivity, electrical conductivity and dielectric properties. This bibliography report consists in: (i) Defining the origins of the dielectric properties of natural polymers by reviewing proteins. Despite their complex molecular chains, proteins present several points of interest, particularly, their charge content conferring their electrical and dielectric properties; (ii) Identifying factors influencing the dielectric properties of protein films...
2016: Sensors
https://www.readbyqxmd.com/read/27524177/biradical-character-in-the-ground-state-of-mn-si12-a-dft-and-caspt2-study
#17
Vaida Arcisauskaite, Domagoj Fijan, Mariano Spivak, Coen de Graaf, John E McGrady
Both density functional theory and multi-configurational ab initio (CASPT2) calculations are used to explore the potential energy surface of the hexagonal prismatic cluster [Mn@Si12](+). Unlike isoelectronic Cr@Si12, the ground state is a biradical, with triplet and open-shell singlet states lying very close in energy. The results are discussed in the context of recent experimental studies using infra-red multiple photon dissociation spectroscopy and X-ray MCD spectroscopy.
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27423109/structural-and-optical-studies-on-selected-web-spinning-spider-silks
#18
R Karthikeyani, A Divya, T Mathavan, R Mohamed Asath, A Milton Franklin Benial, K Muthuchelian
This study investigates the structural and optical properties in the cribellate silk of the sheet web spider Stegodyphus sarasinorum Karsch (Eresidae) and the combined dragline, viscid silk of the orb-web spiders Argiope pulchella Thorell (Araneidae) and Nephila pilipes Fabricius (Nephilidae). X-ray diffraction (XRD), Fourier transform infra-red (FTIR), Ultraviolet-visible (UV-Vis) and fluorescence spectroscopic techniques were used to study these three spider silk species. X-ray diffraction data are consistent with the amorphous polymer network which is arising from the interaction of larger side chain amino acid contributions due to the poly-glycine rich sequences known to be present in the proteins of cribellate silk...
January 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27267039/twisted-and-tubular-silica-structures-by-anionic-surfactant-fibers-encapsulation
#19
Mahshid Chekini, Laure Guénée, Valentina Marchionni, Manish Sharma, Thomas Bürgi
Organic molecules imprinting can be used for introducing specific properties and functionalities such as chirality to mesoporous materials. Particularly organic self-assemblies can work as a scaffold for templating inorganic materials such as silica. During recent years chiral imprinting of anionic surfactant for fabrication of twisted rod-like silica structures assisted by co-structuring directing agent were thoroughly investigated. The organic self-assemblies of anionic surfactants can also be used for introducing other shapes in rod-like silica structures...
September 1, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27185111/preparation-of-succinylated-cellulose-membranes-for-functionalization-purposes
#20
Renato M Ribeiro-Viana, Paula C S Faria-Tischer, Cesar A Tischer
The anhydroglucose chains of cellulose possess hydroxyls that facilitate different chemical modification strategies to expand on, or provide new applications for membranes produced by the bacteria Gluconacetobacter xylinus. Conjugation with biomolecules such as proteins, especially by the amine groups, is of great value and interest for the production of biomaterial derivatives from bacterial cellulose. To assist in these modifications, cellulose was succinylated in order to prevent steric hindrance and to create an attachment point for conjugation...
September 5, 2016: Carbohydrate Polymers
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