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Infra-Red Spectroscopy

Jin-Young Hong, Yongju Jung, Kwang-Man Kim, Seok Kim
Zeolitic imidazolate framework-sulfur composites were synthesized by a simple solvothermal reaction. Furthermore, following thermal treatment enable electrochemical properties to be improved. In order to investigate optimal temperature, we conducted thermal treatment as a function of different temperature. The morphology of the composites was examined by Field Emission Scanning Electron Microscopy and Fourier Transform Infra-red Spectroscopy. Electrochemical characterizations were also conducted by cyclic voltammetry and Galvanostatic charge-discharge tests...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Zahra Hadian, Majedeh Maleki, Khosro Abdi, Fatemeh Atyabi, Abdoreza Mohammadi, Ramin Khaksar
The aim of the present study was to formulate β-cyclodextrin (β-CD) nanoparticles loaded with geraniol (GR) essential oil (EO) with appropriate physicochemical properties. Complexation of GR with β-CD was optimized by evaluation of four formulations, using the co-precipitation method, and the encapsulation efficiency (EE), loading, size, particle size distribution (PDI) and zeta potential were investigated. Further characterization was performed with nuclear magnetic resonance spectroscopy (1 H NMR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and infra-red (IR) spectroscopy analysis...
2018: Iranian Journal of Pharmaceutical Research: IJPR
Himanshu Bhatt, Sri Vishnu Kiran Rompicharla, Neeraja Komanduri, Aashma Shah, Sateja Paradkar, Balaram Ghosh, Swati Biswas
BACKGROUND: Solid lipid nanoparticles (SLNs) represent an affordable, easily scalable, stable and biocompatible drug delivery system with a high drug to lipid ratio which also improves solubility of poorly soluble drugs. OBJECTIVE: SLNs were developed by using glyceryl monostearate as the single lipid in presence of surfactant Poloxamer 188 and evaluated the efficiency of the SLNs to load the therapeutic cargo, curcumin (CUR). METHOD: The nano-formulation was optimized by Quality by Design approach to understand the effect of various process parameters on various quality attributes, including drug loadability, particle size and polydispersity...
May 3, 2018: Current Drug Delivery
M Kluckow, P Lemmers
Assessment and management of a patent ductus arteriosus (PDA) in premature infants remains problematic. The more immature the infant, the more likely a PDA is to be present, due to lower spontaneous PDA closure rates. Clinicians now recognize that not all PDAs require treatment and that selection of the group of infants with a more hemodynamically relevant PDA, often manifesting as an increasing systemic-to-pulmonary shunt, is increasingly important. Ultrasound is the mainstay of diagnosis and physiological assessment of the PDA; however, there are other methodologies used to assess hemodynamic importance of the PDA...
April 27, 2018: Seminars in Fetal & Neonatal Medicine
Pascale Blond, Alice Mattiuzzi, Hennie Valkenier, Ludovic Troian-Gautier, Jean-François Bergamini, Thomas Doneux, Erik Goormaghtigh, Vincent Raussens, Ivan Jabin
Biosensors that can determine protein concentration and structure are highly desired for biomedical applications. For the development of such biosensors, the use of Fourier transformed infra-red (FTIR) spectroscopy with the attenuated internal total reflection (ATR) configuration is particularly attractive but it requires appropriate surface functionalization of the ATR optical element. Indeed, the surface has to specifically interact with a target protein in close contact with the optical element and must display antifouling properties to prevent nonspecific adsorption of other proteins...
May 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Sarita Kumari, R V Kumaraswamy, Ram Chandra Choudhary, S S Sharma, Ajay Pal, Ramesh Raliya, Pratim Biswas, Vinod Saharan
An antibacterial and plant growth promoting nanoemulsion was formulated using thymol, an essential oil component of plant and Quillaja saponin, a glycoside surfactant of Quillaja tree. The emulsion was prepared by a sonication method. Fifty minutes of sonication delivered a long term stable thymol nanoemulsion which was characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), cryogenic-field emission scanning electron microscopy (Cryo-FESEM) and fourier transform infra-red (FTIR) spectroscopy...
April 27, 2018: Scientific Reports
J Hetmańczyk, J Nowicka-Scheibe, J K Maurin, A Pawlukojć
Inelastic neutron scattering (INS) and infra-red (IR) spectroscopy methods were used for determination of dynamic structure of l-leucine - chloranilic acid complex. A theoretical dynamic pattern calculated by the density functional theory (DFT) method for periodic boundary conditions accompanied the experimental ones. Normal modes in the vibrational spectra were defined and described. The characteristic presence of the Hadži's trio enriched by numerous submaxima is observed in the wavenumber range 3200-800 cm-1 ...
April 3, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Muhammad Aqil, Myung Yung Jeong
The robust characterization of real-time brain activity carries potential for many applications. However, the contamination of measured signals by various instrumental, environmental, and physiological sources of noise introduces a substantial amount of signal variance and, consequently, challenges real-time estimation of contributions from underlying neuronal sources. Functional near infra-red spectroscopy (fNIRS) is an emerging imaging modality whose real-time potential is yet to be fully explored. The objectives of the current study are to (i) validate a time-dependent linear model of hemodynamic responses in fNIRS, and (ii) test the robustness of this approach against measurement noise (instrumental and physiological) and mis-specification of the hemodynamic response basis functions (amplitude, latency, and duration)...
April 23, 2018: NeuroImage
Taciano M Barbosa, Leomir A S de Lima, Marfran C D Dos Santos, Simão D Vasconcelos, Renata A Gama, Kássio M G Lima
Unequivocal identification of fly specimens is an essential requirement in forensic entomology. Herein, a simple, non-destructive and rapid method based on two vibrational spectroscopy techniques [Near-Infrared Spectroscopy (NIRS) and attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy] coupled with variable selection techniques such as genetic algorithm-linear discriminant analysis (GA-LDA) and successive projection algorithm-linear discriminant analysis (SPA-LDA) were applied for identifying and discriminating six species of flesh flies (Diptera: Sarcophagidae) native to Neotropical regions...
April 23, 2018: Acta Tropica
V Trehan, Vikas Maheshwari, S V Kulkarni, Sanjeev Kapoor, Anurakshat Gupta
Background: Traumatic Brain Injury (TBI) is one of the most common surgical emergencies in service hospitals of India. Computed tomography (CT) has been a consistent and reliable technique for detecting intracranial hemorrhages but is limited by its non-availability in most service hospitals. Therefore the need for a cheaper, portable and easily available option required to be explored. The aim of this study was to determine the sensitivity, specificity, Positive Predictive Value (PPV) and Negative Predictive Value (NPV) of Near Infra Red Spectroscopy (NIRS) against the gold standard of NCCT head...
April 2018: Medical Journal, Armed Forces India
Anthony M Muliwa, Taile Y Leswifi, Arjun Maity, Aoyi Ochieng, Maurice S Onyango
In the present study, a new composite adsorbent, chitosan/bentonite/manganese oxide (CBMnO) beads, cross-linked with tetraethyl-ortho-silicate (TEOS) was applied in a fixed-bed column for the removal of Mn (II) from water. The adsorbent was characterised by scanning electron microscopy (SEM), Fourier transform infra-red (FT-IR), N2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS) techniques, and moreover the point of zero charge (pHpzc ) was determined. The extend of Mn (II) breakthrough behaviour was investigated by varying bed mass, flow rate and influent concentration, and by using real environmental water samples...
April 24, 2018: Environmental Science and Pollution Research International
Alaknanda J Adur, N Nandini, K Shilpashree Mayachar, R Ramya, N Srinatha
Silver nanoparticles were prepared through eco-friendly, cost effective, bio-mediated technique using anaerobically digested Parthenium hysterophorous digested slurry (PDS) for the first time. The synthesized nanoparticles were characterized through different techniques such as UV-Vis spectrophotometer for optical properties; X-ray diffractometer (XRD), high resolution transmission electron spectroscopy (HR-TEM) and Fourier Transform Infra Red (FTIR) Spectroscopy for structural property investigations. It was observed that the prepared silver nanoparticles were crystallized in face centered cubic crystal structure with an average particle size of 19 nm as confirmed from XRD...
April 16, 2018: Journal of Photochemistry and Photobiology. B, Biology
Marco Marazzi, Hugo Gattuso, Antonio Monari, Xavier Assfeld
Bio-macromolecules as DNA, lipid membranes and (poly)peptides are essential compounds at the core of biological systems. The development of techniques and methodologies for their characterization is therefore necessary and of utmost interest, even though difficulties can be experienced due to their intrinsic complex nature. Among these methods, spectroscopies, relying on optical properties are especially important to determine their macromolecular structures and behaviors, as well as the possible interactions and reactivity with external dyes-often drugs or pollutants-that can (photo)sensitize the bio-macromolecule leading to eventual chemical modifications, thus damages...
2018: Frontiers in Chemistry
Mahmoudreza Ovissipour, Setareh Ghorban Shiroodi, Barbara Rasco, Juming Tang, Shyam S Sablani
This study investigated the effect of different electrolyzed water (EO) solutions, including acidic electrolyzed water (AEW) and neutral electrolyzed water (NEW), alone and in combination with mild thermal processing (50, 55, 60, 65 °C) at different exposure times (2, 6, 10 min) on the reduction of Listeria monocytogenes on Atlantic salmon fillets. The effects of the EO water solutions on cell wall structures of L. monocytogenes and on the secondary structure of salmon protein were studied using Fourier Transform Infra-Red (FTIR) spectroscopy...
April 4, 2018: International Journal of Food Microbiology
Ronan M Dorrepaal, Bernard M Lawless, Hanna E Burton, Daniel M Espino, Duncan E T Shepherd, Aoife A Gowen
Hyperspectral chemical imaging (HCI) is an emerging technique which combines spectroscopy with imaging. Unlike traditional point spectroscopy, which is used in the majority of polymer biomaterial degradation studies, HCI enables the acquisition of spatially localised spectra across the surface of a material in an objective manner. Here, we demonstrate that attenuated total reflectance Fourier transform infra-red (ATR-FTIR) HCI reveals spatial variation in the degradation of implantable polycarbonate urethane (PCU) biomaterials...
April 4, 2018: Acta Biomaterialia
Maria Teresa Caccamo, Vincenzo Zammuto, Concetta Gugliandolo, Claire Madeleine-Perdrillat, Antonio Spanò, Salvatore Magazù
To dynamically characterize the thermal properties of the fructose-rich exopolysaccharide (EPS1-T14), produced by the marine thermophilic Bacillus licheniformis T14, the Attenuated Total Reflectance Fourier Transform Infra-Red spectroscopy was coupled to variable temperature ranging from ambient to 80 °C. The spectra were analyzed by the following innovative mathematical tools: i) non-ideal spectral deviation, ii) OH-stretching band frequency center shift, iii) spectral distance, and iv) wavelet cross-correlation analysis...
March 27, 2018: International Journal of Biological Macromolecules
Takemi Matsui, Toshikazu Shinba, Guanghao Sun
12.6% of major depressive disorder (MDD) patients have suicide intent, while it has been reported that 43% of patients did not consult their doctors for MDD, automated MDD screening is eagerly anticipated. Recently, in order to achieve automated screening of MDD, biomarkers such as multiplex DNA methylation profiles or physiological method using near infra-red spectroscopy (NIRS) have been studied, however, they require inspection using 96-well DNA ELIZA kit after blood sampling or significant cost. Using a single-lead electrocardiography (ECG), we developed a high-precision MDD screening system using transient autonomic responses induced by dual mental tasks...
March 23, 2018: Journal of Medical Engineering & Technology
Kamal T Hindy, Ashraf R Baghdady, Fares M Howari, Ahmed S Abdelmaksoud
This study is concerned with the identification of the mineralogical composition of dust fall samples collected from southeast of Cairo, Egypt. The mineralogical identification was conducted by means of the polarizing microscope, infra-red spectroscopy (IR), and X-ray diffraction (XRD). The relationship between the mineralogical composition of dust fall samples and 10 rock samples from the surrounding terrains were investigated. The major mineralogical species existing in the atmosphere of the study area are: carbonates mainly in the form of calcite in addition to the appearance of the dolomite form in traces overall the study area, but with considerable observation in the southern region; quartz which is less than calcite in its abundance; sulphates in the form of gypsum which may also be present as traces in the anhydrite form...
March 21, 2018: International Journal of Environmental Research and Public Health
Robert G Ryan, Alastair Stacey, Kane M O'Donnell, Takeshi Ohshima, Brett Cameron Johnson, Lloyd C L Hollenberg, Paul Mulvaney, David Allan Simpson
Nanoscale quantum probes such as the nitrogen-vacancy (NV) centre in diamond have demonstrated remarkable sensing capabilities over the past decade as control over the fabrication and manipulation of these systems has evolved. The bio-compatibility and rich surface chemistry of diamond has added to the utility of these probes, but as the size of these nanoscale systems is reduced, the surface chemistry of diamond begins to impact the quantum properties of the NV centre. In this work, we systematically study the effect of the diamond surface chemistry on the quantum coherence of the NV centre in nanodiamonds 50 nm in size...
March 20, 2018: ACS Applied Materials & Interfaces
Nigel Scrutton, Uzma Choudry, Derren Heyes, Samantha Hardman, Michiyo Sakuma, Igor Sazanovich, Joyce Woodhouse, Eugenio De La Mora, Martin Pederson, Michael Wulff, Martin Weik, Giorgio Schiro
Phytochromes are bilin-containing photoreceptors that are typically sensitive to the red / far-red region of the visible spectrum. Recently phytochromes from certain eukaryotic algae have become attractive targets for optogenetic applications because of their unique ability to respond to multiple wavelengths of light. Here, we have used a combination of time-resolved spectroscopy and structural approaches across picosecond to second timescales to map photochemical mechanisms and structural change in this atypical group of phytochromes...
March 15, 2018: Chembiochem: a European Journal of Chemical Biology
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