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Youqiao Ma, Jun Zhou, Jaromír Pištora, Mohamed Eldlio, Nghia Nguyen-Huu, Hiroshi Maeda, Qiang Wu, Michael Cada
Seeking better surface plasmon polariton (SPP) waveguides is of critical importance to construct the frequency-agile terahertz (THz) front-end circuits. We propose and investigate here a new class of semiconductor-based slot plasmonic waveguides for subwavelength THz transport. Optimizations of the key geometrical parameters demonstrate its better guiding properties for simultaneous realization of long propagation lengths (up to several millimeters) and ultra-tight mode confinement (~λ(2)/530) in the THz spectral range...
December 7, 2016: Scientific Reports
Amandeep Kaur, Parampaul K Banipal, Tarlok S Banipal
The energetics and the impact on the conformation of heme containing protein myoglobin (Mb) due to the binding of three transition metal ions (Zn(2+), Ni(2+), and Mn(2+)) have been investigated using isothermal titration calorimetry (ITC), dynamic light scattering (DLS), UV-vis, and circular dichroism (CD) spectroscopy under physiological conditions. The binding affinity of the order of 10(4)M(-1) has been observed for all metal ions from calorimetry as well as from absorption spectroscopy. The binding of these metal ions with Mb is a spontaneous process that exposes the hydrophobic groups away from the protein core as exhibited by the negative Gibbs free energy change (ΔG) and positive heat capacity change (ΔCp) values...
November 27, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Priyatosh Ranjan, Dhiman Ghosh, Deepthi S Yarramala, Subhadeep Das, Samir K Maji, Ashutosh Kumar
BACKGROUND: Copper is an essential trace element required for the proper functioning of various enzymes present in central nervous system. An imbalance in the copper homeostasis results in the pathology of various neurogenerative disorders including Parkinson's Disease. Hence, residue specific interaction of Cu(2+) to α-Syn along with the familial mutants H50Q and G51D needs to be studied in detail. METHODS: We investigated the residue specific mapping of Cu(2+) binding sites and binding strength using solution-state NMR and ITC respectively...
December 1, 2016: Biochimica et Biophysica Acta
Phoebe Zapanta Trio, Atsuyoshi Kawahara, Shunsuke Tanigawa, Kozue Sakao, De-Xing Hou
6-MSITC and 6-MTITC are sulforaphane (SFN) analogs found in Japanese Wasabi. As we reported previously, Wasabi isothiocyanates (ITCs) are activators of Nrf2-antioxidant response element pathway, and also inhibitors of pro-inflammatory cyclooxygenase-2. This study is the first to assess the global changes in transcript levels by Wasabi ITCs, comparing with SFN, in HepG2 cells. We performed comparative gene expression profiling by treating HepG2 cells with ITCs, followed by DNA microarray analyses using HG-U133 plus 2...
December 2, 2016: Nutrition and Cancer
Paweł Szychta, Bogusław Westfal, Rafał Maciejczyk, Beata Smolarz, Hanna Romanowicz, Tomasz Krawczyk, Marek Zadrożny
INTRODUCTION: The aim of the study was to evaluate the clinical usefulness of a one-step nucleic acid amplification assay (OSNA) for intraoperative detection of metastases to sentinel lymph nodes (SLNs) in comparison to examination of frozen sections, and to summarize the results of previous studies. MATERIAL AND METHODS: We enrolled 98 patients aged 58.13 ±10.74 years treated surgically for breast cancer, and 99 biopsies of SLNs were followed by analysis of 105 SLNs...
December 1, 2016: Archives of Medical Science: AMS
Reza Assaran Darban, Behzad Shareghi, Ahmad Asoodeh, Jamshidkhan Chamani
The present study was carried out to characterize ACE inhibitory peptides which are release from the trypsin hydrolysate of wheat gluten protein. The binding of two inhibitory peptide (P4 and P6) to human serum albumin (HSA) under physiological conditions has been investigated by multi- spectroscopic in combination with molecular modeling techniques. Time-resolved and quenching fluorescence spectroscopies results revealed that the quenching of HSA fluorescence by P4 and P6 in the binary and ternary systems caused HSA-peptides complexes formation...
November 29, 2016: Journal of Biomolecular Structure & Dynamics
Misaki Kinoshita, Ju Yaen Kim, Satoshi Kume, Yuxi Lin, K Hun Mok, Yosky Kataoka, Koichiro Ishimori, Natalia Markova, Genji Kurisu, Toshiharu Hase, Young-Ho Lee
In spite of a number of studies to characterize ferredoxin (Fd):ferredoxin NADP(+) reductase (FNR) interactions at limited conditions, detailed energetic investigation on how these proteins interact under near physiological conditions and its linkage to FNR activity are still lacking. We herein performed systematic Fd:FNR binding thermodynamics using isothermal titration calorimetry (ITC) at distinct pH (6.0 and 8.0), NaCl concentrations (0-200 mM), and temperatures (19-28 °C) for mimicking physiological conditions in chloroplasts...
November 25, 2016: Biochemical and Biophysical Research Communications
Moumita Dasgupta, Nand Kishore
We have analysed binding of Thioflavin T (ThT) with molten globule (MG) and native (N) states of α-lactalbumin (α-LA) by using calorimetry and spectroscopy. ThT has been widely used for detection of amyloid fibrils from enhancement of its fluorescence emission intensity. Instead of the spectral changes of ThT, we, rather, monitored the changes occurring in the spectral properties of the MG and N states upon interaction with ThT, from fluorescence, absorbance and circular dichroism (CD) spectroscopy. Our novel and most important observation is non-fluorescent mode of binding of ThT to the MG state of α-LA suggesting that the mechanism of binding is distinctly different from that of association with the protein fibrils...
November 23, 2016: International Journal of Biological Macromolecules
Aleksandra Tesmar, Dariusz Wyrzykowski, Eva Muñoz, Bogusław Pilarski, Joanna Pranczk, Dagmara Jacewicz, Lech Chmurzyński
The influence of the different side chain residues on the thermodynamic and kinetic parameters for complexation reactions of the Co(2)(+) and Ni(2)(+) ions has been investigated by using the isothermal titration calorimetry (ITC) technique supported by potentiometric titration data. The study was concerned with the 2 common tripodal aminocarboxylate ligands, namely, nitrilotriacetic acid and N-(2-hydroxyethyl) iminodiacetic acid. Calorimetric measurements (ITC) were run in the 2-(N-morpholino)ethanesulfonic acid hydrate (2-(N-morpholino) ethanesulfonic acid), piperazine-N,N'-bis(2-ethanesulfonic acid), and dimethylarsenic acid buffers (0...
November 25, 2016: Journal of Molecular Recognition: JMR
Ankur Bikash Pradhan, Sutanwi Bhuiya, Lucy Haque, Suman Das
Here we have reported a detail study on the interaction of the benzophenanthridine alkaloid chelerythrine (CHL) with double stranded polyriboadenylic acid [ds poly (rA)] by exploiting various spectroscopic techniques. The alkaloid shows high binding affinity (binding constant is 1.10×10(5)M(-1)) towards the double stranded RNA as revealed from Scatchard plot. The binding was confirmed by hypochromic effect in the UV-vis spectrum of CHL, increase in fluorescence intensity of CHL and perturbations of the circular dichroism (CD) spectrum of ds poly (rA)...
November 21, 2016: International Journal of Biological Macromolecules
J Sláma, M Zikán, D Fischerová, R Kocián, A Germanová, F Frühauf, D Cibula
OBJECTIVE: Usage of sentinel lymph-node (SLN) concept in locally advanced cervical cancers might help to individualise management. According to SLN status could be patients refered to neoadjuvant chemotherapy (NAC) with subsequent surgery or to primary chemoradiation. The aim of our study was to evaluate sensitivity of SLN detection in locally advanced cervical cancers and to assess the impact of NAC on frequency of their metastatic involvement. DESIGN: Retrospective clinical study...
2016: Ceská Gynekologie
Chao Xu, Hideaki Ishikawa, Keiichi Izumikawa, Li Li, Hao He, Yuko Nobe, Yoshio Yamauchi, Hanief M Shahjee, Xian-Hui Wu, Yi-Tao Yu, Toshiaki Isobe, Nobuhiro Takahashi, Jinrong Min
In cytoplasm, the survival of motor neuron (SMN) complex delivers pre-small nuclear RNAs (pre-snRNAs) to the heptameric Sm ring for the assembly of the ring complex on pre-snRNAs at the conserved Sm site [A(U)4-6G]. Gemin5, a WD40 protein component of the SMN complex, is responsible for recognizing pre-snRNAs. In addition, Gemin5 has been reported to specifically bind to the m(7)G cap. In this study, we show that the WD40 domain of Gemin5 is both necessary and sufficient for binding the Sm site of pre-snRNAs by isothermal titration calorimetry (ITC) and mutagenesis assays...
November 1, 2016: Genes & Development
Wenlong Sun, Bowei Zhang, Haizhou Zheng, Chunlin Zhuang, Xia Li, Xinhua Lu, Chunshan Quan, Yuesheng Dong, Zhihui Zheng, Zhilong Xiu
AIM: To screen a potential PTP1b inhibitor from the microbial origin-based compound library and to investigate the potential anti-diabetic effects of the inhibitor in vivo and determine its primary anti-diabetic mechanism in vitro and in silico. METHODS: PTP1b inhibitory activity was measured using recombination protein as the enzyme and p-NPP as the substrate. The binding of the inhibitor to PTP1b was analysed by docking in silico and confirmed by ITC experiments...
November 18, 2016: Life Sciences
F Trusch, K Kowski, K Bravo-Rodriguez, C Beuck, A Sowislok, B Wettig, A Matena, E Sanchez-Garcia, H Meyer, T Schrader, P Bayer
Molecular tweezers for lysine and arginine select a few residues on a protein surface and by their unique complexation mode disrupt a critical protein-protein interaction. Detailed structural information was gained by NMR experiments, strongly supported by QM/MM calculations and further substantiated by ITC, fluorescence anisotropy, ELISA and bio-layer-interference studies.
December 1, 2016: Chemical Communications: Chem Comm
Mathieu P Pelletier, Vincent Q Trinh, Philippe Stephenson, Anne-Marie Mes-Masson, Vanessa Samouelian, Diane M Provencher, Kurosh Rahimi
While many studies have evaluated the impact of mismatch repair protein loss of expression (MMR LOE) or microcystic, elongated and fragmented (MELF) pattern of myometrial invasion as individual factors in endometrial cancer, we analyzed the combined impact of both. We reviewed every case of FIGO grade 1 endometrioid endometrial cancers (EEC) from our institution, between 2011 and 2015, that had a sentinel lymph node biopsy and/or a lymphadenectomy, and examined the following data: age, myometrial infiltration, MELF infiltration, lymphovascular space invasion and lymph node status...
November 15, 2016: Human Pathology
Diana P Gaspar, Carmen Serra, Paulo R Lino, Lídia Gonçalves, Pablo Taboada, Carmen Remuñán-López, António J Almeida
Associating protein with nanoparticles is an interesting strategy to improve their bioavailability and biological activity. Solid lipid nanoparticles (SLN) have been sought as carriers for therapeutic proteins transport to the lung epithelium. Nevertheless, because of their low inertia, nanoparticles intended for pulmonary application usually escape from lung deposition. To overcome this problem, the production of spray-dried powders containing nanoparticles has been recently reported. Herein we developed new hybrid microencapsulated SLN for pulmonary administration, containing a model protein (papain, PAP)...
November 15, 2016: International Journal of Pharmaceutics
A Akirov, A Grossman, T Shochat, I Shimon
CONTEXT: Hypoglycemia is common among hospitalized patients with and without diabetes mellitus (DM) but the prognostic implications may differ with spontaneous versus insulin-related hypoglycemia. OBJECTIVE: Investigate the association between spontaneous or insulin-related hypoglycemia and mortality in hospitalized patients. DESIGN: Hypoglycemia was defined as blood glucose <70mg/dl (3.9 mmol/l), including moderate hypoglycemia (40-70mg/dl, 2...
November 17, 2016: Journal of Clinical Endocrinology and Metabolism
Cai-Cai Zhang, Sheng-Hua Li, Cui-Fang Zhang, Yu Liu
A photo/thermal-switchable supramolecular nanoparticles assembly has been constructed based on an inclusion complex between anionic pillar[5]arene 2C-WP5A and azobenzene derivative Azo-py-OMe (G). The novel anionic pillar[5]arene-based host-guest inclusion complexation was investigated by the (1)H NMR titration, 2D ROESY and isothermal titration microcalorimetry (ITC) showing high association constant (Ka) of (2.60 ± 0.06) × 10(4) M(-1) with 1:1 binding stoichiometry. Furthermore, the supramolecular nanoparticles assembly can be conveniently obtained from G and a small amount of 2C-WP5A in aqueous solution, which was so-called "host induced aggregating (HIA)"...
November 16, 2016: Scientific Reports
Mart Reimund, Oleg Kovrov, Gunilla Olivecrona, Aivar Lookene
Lipoprotein lipase (LPL) hydrolyzes triglycerides in plasma lipoproteins. Due to the complex regulation mechanism, it has been difficult to mimic in vitro the physiological conditions under which LPL acts. We demonstrate that isothermal titration calorimetry (ITC), using human plasma as substrate, overcomes several limitations of previously used techniques. The high sensitivity of ITC allows continuous recordings of the heat released during hydrolysis. Both initial rates and kinetics for complete hydrolysis of plasma lipids can be studied...
November 14, 2016: Journal of Lipid Research
Konstantinos Gardikis, Marco Signorelli, Chiara Ferrario, Alberto Schiraldi, Maria Grazia Fortina, Sophia Hatziantoniou, Costas Demetzos, Dimitrios Fessas
The release of the anticancer drug doxorubicin (DOX) incorporated in a new drug carrier, namely a chimeric nanosystem formed by liposomes and dendrimers, was studied following the influence of the drug on the growth kinetics of the Lactobacillus helveticus bacterium, that would mimic the intestinal microflora. The bacterial growth was followed at 37°C by means of Isothermal Titration Calorimetry (ITC) and the method was assessed to monitor the overall effect of the delivered drug obtaining simple objective parameters to define the encapsulation effectiveness of the system, discriminating dose effects even in cases of very low release...
November 11, 2016: International Journal of Pharmaceutics
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