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Iqra Munir, Sadia Ajmal, Muhammad Raza Shah, Aftab Ahmad, Abdul Hameed, Syed Abid Ali
Present study was conducted to establish the interaction of bovine fetuin-A to validate its binding modalities with doxorubicin (Dox). Fetuin-A was purified to highest purity and monodispersity. Green synthesis of fetuin-A conjugated gold nanoparticles (F-GNPs) have been performed giving typical UV-maxima with subtle variation in fourier transform infrared spectroscopy (FTIR). Atomic force microscopy (AFM) revealed spherical shaped, polydisperse F-GNPs of varying sizes, complementing the radius of hydration (19...
March 18, 2017: International Journal of Biological Macromolecules
Xuandong Lin, Fangfang Xie, Xueling Ma, Yuhong Hao, Hejia Qin, Jindong Long
The occlusion of dentinal tubules is an effective method to alleviate the symptoms of dentin hypersensitivity. In this paper, we successfully modified nano-hydroxyapatite (n-HAP)with carboxyl-terminated polyamidoamine dendrimers by an aqueous-based chemical method and verified by fourier transform infrared spectroscopy (FTIR) and transmission electron microscope(TEM). Then the demineralization dentin discs were randomly divided into 4 groups, corresponding to subsequent brushing experiments: deionized water and kept in artificial saliva (AS), dendrimer-functionalized n-HAP and stored in AS, n-HAP and saved in AS, dendrimer-functionalized n-HAP and stored in deionized water...
March 22, 2017: Journal of Biomaterials Science. Polymer Edition
Marie Trefna, Maaike Goris, Cynthia M C Thissen, Vera A Reitsema, Jojanneke J Bruintjes, Edwin L de Vrij, Hjalmar R Bouma, Ate S Boerema, Robert H Henning
Research on deep hibernators almost exclusively uses species captured from the wild or from local breeding. An exception is Syrian hamster (Mesocricetus auratus), the only standard laboratory animal showing deep hibernation. In deep hibernators, several factors influence hibernation quality, including body mass, sex and diet. We examined hibernation quality in commercially obtained Syrian hamsters in relation to body mass, sex and a diet enriched in polyunsaturated fatty acids. Animals (M/F:30/30, 12 weeks of age) were obtained from Harlan (IN, USA) and individually housed at 21 °C and L:D 14:10 until 20 weeks of age, followed by L:D 8:16 until 27 weeks...
March 21, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Leyong Zeng, Di Wu, Ying Tian, Yuanwei Pan, Aiguo Wu, Jinchao Zhang, Guangming Lu
Near-infrared (NIR) light responsive nanomaterials have attracted considerable attention due to their location in the biological window. Especially, lanthanide-doped nanomaterials exhibit unique upconversion luminescence (UCL) properties with low background interference and long luminescence lifetime, which makes them promising in imaging diagnosis of cancers. Compared with traditional upconversion nanomaterials excited by 980 nm laser, 808 nm excitation can overcome the disadvantages of high heating effect and weak penetration depth induced by excitation source...
March 20, 2017: Current Medicinal Chemistry
Hakan Solmaz, Yekta Ulgen, Murat Gulsoy
Fibroblast cells are known to be one of the key elements in wound healing process, which has been under the scope of research for decades. However, the exact mechanism of photobiomodulation on wound healing is not fully understood yet. Photobiomodulation of 635 and 809 nm laser irradiation at two different energy densities were investigated with two independent experiments; first, in vitro cell proliferation and then in vivo wound healing. L929 mouse fibroblast cell suspensions were exposed with 635 and 809 nm laser irradiations of 1 and 3 J/cm(2) energy densities at 50 mW output power separately for the investigation of photobiomodulation in vitro...
March 20, 2017: Lasers in Medical Science
Cheng Zhang, Nathaniel Kinsey, Long Chen, Chengang Ji, Mingjie Xu, Marcello Ferrera, Xiaoqing Pan, Vladimir M Shalaev, Alexandra Boltasseva, L Jay Guo
The field of nanophotonics has ushered in a new paradigm of light manipulation by enabling deep subdiffraction confinement assisted by metallic nanostructures. However, a key limitation which has stunted a full development of high-performance nanophotonic devices is the typical large losses associated with the constituent metals. Although silver has long been known as the highest quality plasmonic material for visible and near infrared applications, its usage has been limited due to practical issues of continuous thin film formation, stability, adhesion, and surface roughness...
March 20, 2017: Advanced Materials
Katarzyna Cieślik-Boczula
The temperature-induced α-helix to β-sheet transition in long-chain poly-l-lysine (PLL), accompanied by the gauche-to-trans isomerization of CH2 groups in the hydrocarbon side chains of Lys amino acid residues, and formation of β-sheet as well as α-helix fibrillar aggregates of PLL have been studied using Fourier-transform infrared (FT-IR) and vibrational circular dichroism (VCD) spectroscopy, and transmission electron microscopy (TEM). In a low-temperature alkaline water solution or in a methanol-rich water mixture, the secondary structure of PLL is represented by α-helical conformations with unordered and gauche-rich hydrocarbon side chains...
March 14, 2017: Biochimie
Cassie Kimble, Christopher M Burba
Ionic liquids are a fertile and active area of research, in part, due to the unique properties these solvents offer over traditional molecular solvents. Since these properties are rooted in the fundamental ion-ion interactions that govern liquid structure, there is a strong motivation to characterize liquid structure. Infrared spectroscopy is a standard analytical tool for assessing the liquid structure, for the intramolecular vibrational modes of the composing the materials are often quite sensitive to the local environment about a given ion...
March 17, 2017: Journal of Physical Chemistry. B
Marjan Mahboubifar, Bahram Hemmateenejad, Katayoun Javidnia, Saeed Yousefinejad
Long thermal oxidative kinetic and stability of four different edible oils (colza, corn, frying, sunflower) from various brands were surveyed with the use of attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) combined with multivariate curve resolution-alternative least square (MCR-ALS). Sampling from the heated oils (at 170 °C) was performed each 3 h during a 36-h period. Changes in the ATR-FTIR spectra of the oil samples in the range of 4000-550 cm(-1) were followed as a function of heating time...
March 2017: Journal of Food Science and Technology
Juanjuan Peng, Animesh Samanta, Xiao Zeng, Sanyang Han, Lu Wang, Dongdong Su, Daniel Teh Boon Loong, Nam-Young Kang, Sung-Jin Park, Angelo Homayoun All, Wenxuan Jiang, Lin Yuan, Xiaogang Liu, Young-Tae Chang
Drug toxicity is a long-standing concern of modern medicine. A typical anti-pain/fever drug paracetamol often causes hepatotoxicity due to peroxynitrite ONOO(-) . Conventional blood tests fail to offer real-time unambiguous visualization of such hepatotoxicity in vivo. Here we report a luminescent approach to evaluate acute hepatotoxicity in vivo by chromophore-conjugated upconversion nanoparticles. Upon injection, these nanoprobes mainly accumulate in the liver and the luminescence of nanoparticles remains suppressed owing to energy transfer to the chromophore...
March 15, 2017: Angewandte Chemie
Cornelius Cilliers, Ian Nessler, Nikolas Christodolu, Greg M Thurber
Monoclonal antibodies labeled with near infrared (NIR) fluorophores have potential use in disease detection, intraoperative imaging, and pharmacokinetic characterization of therapeutic antibodies in both the preclinical and clinical setting. Recent work has shown conjugation of NIR fluorophores to antibodies can potentially alter antibody disposition at a sufficiently high degree of labeling (DoL); however, other reports show minimal impact after labeling with NIR fluorophores. In this work, we label two clinically approved antibodies Herceptin (trastuzumab) and Avastin (bevacizumab) with NIR dyes IRDye 800CW (800CW) or Alexa Fluor 680 (AF680), at 1...
March 15, 2017: Molecular Pharmaceutics
Lei Wang, Yangyang Wan, Yanjun Ding, Yuchen Niu, Yujie Xiong, Xiaojun Wu, Hangxun Xu
Nanostructured semiconducting polymers have emerged as a very promising class of metal-free photocatalytic materials for solar water splitting. However, they generally exhibit low efficiency and lack the ability to utilize long-wavelength photons in a photocatalytic oxygen evolution reaction (OER). Here, based on first-principles calculations, we reveal that the two-dimensional (2D) aza-fused conjugated microporous polymer (aza-CMP) with a honeycomb network is a semiconductor with novel layer-dependent electronic properties...
March 15, 2017: Nanoscale
Naishen Liang, Munemasa Teramoto, Masahiro Takagi, Jiye Zeng
This paper describes a project for evaluation of global warming's impacts on soil carbon dynamics in Japanese forest ecosystems. We started a soil warming experiment in late 2008 in a 55-year-old evergreen broad-leaved forest at the boundary between the subtropical and warm-temperate biomes in southern Japan. We used infrared carbon-filament heat lamps to increase soil temperature by about 2.5 °C at a depth of 5 cm and continuously recorded CO2 emission from the soil surface using a multichannel automated chamber system...
March 14, 2017: Scientific Data
Meng Shi, Long-Yue Huang, Ning Nie, Jian-Hui Ye, Xin-Qiang Zheng, Jian-Liang Lu, Yue-Rong Liang
Rice bran protein isolate (RBPI) was prepared from defatted rice bran and used to deliver tea catechins. RBPI had the high adsorption selectivity for tea catechins over caffeine. The adsorption characteristics of tea catechins onto RBPI were determined over a range of time (0-300min), concentration (0.25-3.5gL(-1)) and temperatures (5°C, 20°C and 35°C). The adsorption kinetic data of EGCg and total catechins (TC) onto RBPI showed excellent fitness with the pseudo-second-order model, indicating that chemisorption is the dominating process...
March 2017: Food Research International
T Mizoguchi, T Miyata, W Olovsson
The pioneer, Ondrej L. Krivanek, and his collaborators have opened up many frontiers for the electron energy loss spectroscopy (EELS), and they have demonstrated new potentials of the EELS method for investigating materials. Here, inspired by those achievements, we show further potentials of EELS based on the results of theoretical calculations, that is excitonic and van der Waals (vdW) interactions, as well as vibrational information of materials. Concerning the excitonic interactions, we highlight the importance of the two-particle calculation to reproduce the low energy-loss near-edge structure (ELNES), the Na-L2,3 edge of NaI and the Li-K edge of LiCl and LiFePO4...
March 2, 2017: Ultramicroscopy
Andrea Lamberti, Francesco Perrucci, Matteo Caprioli, Mara Serrapede, Marco Fontana, Stefano Bianco, Sergio Ferrero, Elena Tresso
In certain polymers the graphenization of carbon atoms can be obtained by laser writing owing to the easy absorption of the long wavelength radiation, which generates photothermal effects. On polyimide surface this process allows the formation of a nanostructured and porous carbon network known as Laser-Induced Graphene (LIG). Herein we report on the effect of the process parameters onto the morphology and the physical properties of LIG nanostructures. We show that the scan speed and the frequency of the incident radiation affect the gas evolution, inducing different structure rearrangement, an interesting nitrogen-self doping phenomenon and consequently different conduction properties...
March 10, 2017: Nanotechnology
Rui Wang, Lei Zhou, Wenxing Wang, Xiaomin Li, Fan Zhang
Non-invasive monitoring of gastrointestinal drug release in vivo is extremely challenging because of the limited spatial resolution and long scanning time of existing bioimaging modalities, such as X-ray radiation and magnetic resonance. Here, we report a novel microcarrier that can retain drugs and withstand the harsh conditions of gastrointestinal tract. Significantly, we can track the microcarrier fate and semi-quantitatively monitor the content of drug released in vivo in real time by measuring the fluorescence signals in the second near-infrared window of lanthanide-based downconversion nanoparticles with an absorption competition-induced emission bioimaging system...
March 10, 2017: Nature Communications
Gerhard Pichler, Georg M Schmölzer, Berndt Urlesberger
This article provides a review of cerebral tissue oxygenation during immediate transition after birth in human neonates. Recommended routine monitoring, especially if resuscitation is needed, during this period includes arterial oxygen saturation and heart rate measured by pulse oximetry and electrocardiogram. However, there is increasing interest to monitor in addition with near-infrared spectroscopy (NIRS) the oxygenation of the brain. There is a different pattern of increase between cerebral tissue oxygenation and arterial oxygen saturation during the immediate transition, with cerebral tissue oxygenation reaching a plateau faster than arterial oxygen saturation...
2017: Frontiers in Pediatrics
Grant M Kennedy, Matthew A Kenworthy, Joshua Pepper, Joseph E Rodriguez, Robert J Siverd, Keivan G Stassun, Mark C Wyatt
RZ Psc is a young Sun-like star, long associated with the UXor class of variable stars, which is partially or wholly dimmed by dust clumps several times each year. The system has a bright and variable infrared excess, which has been interpreted as evidence that the dimming events are the passage of asteroidal fragments in front of the host star. Here, we present a decade of optical photometry of RZ Psc and take a critical look at the asteroid belt interpretation. We show that the distribution of light curve gradients is non-uniform for deep events, which we interpret as possible evidence for an asteroidal fragment-like clump structure...
January 2017: Royal Society Open Science
Long Xu, Xiaogang Tao, Weiming Liu, Yanong Li, Jun Ma, Te Lu, Bo Han, Baiyun Liu, Yuanli Zhao, Jingsheng Li, Jizong Zhao
BACKGROUND: Secondary brain injury is the main cause of mortality from traumatic brain injury (TBI). One hallmark of TBI is intracranial hemorrhage, which occurs in 40-50% of severe TBI cases. Early identification of intracranial hematomas in TBI patients allows early surgical evacuation, and can reduce the case-fatality rate of TBI. Since pre-hospital care is the weakest part of Chinese emergency care, there is an urgent need for a capability to detect brain hematomas early. The purpose of this observational study was to evaluate the performance of a near infrared (NIR) based, device to screen for traumatic intracranial hematomas in Chinese population...
March 6, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
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