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thermo activated

Tsukuru Masuda, Naohiko Shimada, Atsushi Maruyama
Membrane active peptides (MAPs) have potential applications in drug delivery systems and as antimicrobials. We previously showed that a cationic comb-type copolymer, poly(allylamine)-graft-dextran (PAA-g-Dex), forms a soluble inter-polyelectrolyte complex with an anionic MAP, the E5 peptide, resulting in significant enhancement of the membrane disruption activity of E5. In this study, we designed a novel comb-type cationic copolymer composed of a PAA main chain and thermo-responsive poly(N-isopropylacrylamide) graft chains (PAA-g-PNIPAAm)...
March 12, 2018: Biomacromolecules
Negin Parham, Homayon Ahmad Panahi, Alireza Feizbakhsh, Elham Moniri
In this present study, poly (N-isopropylacrylamide) as a thermo-sensitive agent was grafted onto magnetic nanoparticles, then ethylenediamine and methylmethacrylate were used to synthesize the first generation of poly amidoamine (PAMAM) dendrimers successively and the process continued alternatively until the ten generations of dendrimers. The synthesized nanocomposite was investigated using Fourier transform infrared spectrometry, thermalgravimetry analysis, X-ray diffractometry, elemental analysis and vibrating-sample magnetometer...
February 24, 2018: Journal of Chromatography. A
Feng Zhao, Rongjiu Shi, Fang Ma, Siqin Han, Ying Zhang
BACKGROUND: Rhamnolipids are the most extensively studied biosurfactants and has been successfully used in various areas from bioremediation to industrial fields. Rhamnolipids structural composition decide their physicochemical properties. Different physicochemical properties influence their application potential. Rhamnolipids can be produced at both aerobic conditions and anaerobic conditions by Pseudomonas aeruginosa. This study aims to evaluate the oxygen effects on the rhamnolipids yield, structural composition, physicochemical properties and the rhl-genes expression in P...
March 9, 2018: Microbial Cell Factories
Jing Zhan, Ya Ding, Benyan Zou, Hai Liao, Wenqi Jiang, Su Li
BACKGROUND AND OBJECTIVE: Puquitinib mesylate (XC-302) is a new multiple-target anticancer inhibitor, which directly suppresses the activity of phosphatidylinositol 3-kinase (PI3K). This study was aimed to develop a sensitive and specific liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-ESI MS/MS) method for the quantification and pharmacokinetic investigation of plasma puquitinib in cancer patients. METHODS: The analytes of human plasma were prepared by liquid-liquid extraction using methyl-t-butyl ether (MTBE)...
March 8, 2018: European Journal of Drug Metabolism and Pharmacokinetics
Justyna Maliszewska, Sonia Marcinkowska, Anna Nowakowska, Hanna Kletkiewicz, Justyna Rogalska
Some natural alkaloids, e.g. capsaicin and camphor, are known to induce a desensitization state, causing insensitivity to pain or noxious temperatures in mammals by acting on TRP receptors. Our research, for the first time, demonstrated that a phenomenon of pharmacological blockade of heat sensitivity may operate in American cockroach, Periplaneta americana (L.). We studied the escape reaction time from 50°C for American cockroaches exposed to multiple doses of different drugs affecting thermo-TRP. Capsaicin, capsazepine, and camphor induced significant changes in time spent at noxious ambient temperatures...
2018: PloS One
Jonathan Ward, Khosro Zangeneh Kamali, Lei Xu, Guoquan Zhang, Andrey E Miroshnichenko, Mohsen Rahmani
Novel types of optical hybrid metasurfaces consist of metallic and dielectric elements are designed and proposed for controlling the interference between magnetic and electric modes of the system, in a reversible manner. By employing the thermo-optical effect of silicon and gold nanoantennas we demonstrate an active control on the excitation and interference between electric and magnetic modes, and subsequently, the Kerker condition, as a directive radiation pattern with zero backscattering, via temperature control as a versatile tool...
2018: Beilstein Journal of Nanotechnology
Marianna Raczyk, Anna Paszel-Jaworska, Magdalena Rudzińska
BACKGROUND: Phytosterols are mainly known as a cholesterol-lowering factor, although they form oxidation products during food storage and processing. Moreover, phytosterol oxidation products (POP) can be ab- sorbed and found in human serum, so there is the need to investigate their impact on different kinds of cells. METHODS: Esters of fatty acids (oleic, linoleic and linolenic) with stigmasterol were synthetized and heated at 180°C, for 1–12 hours...
January 2018: Acta Scientiarum Polonorum. Technologia Alimentaria
Fareeha Bashir, Muhammad Asgher, Fatima Hussain, Muhammad Atif Randhawa
An alkaline protease was produced by B. licheniformis with 132.43 ± 3.4 U/mL activity in LSF which was further enhanced by optimizing culture conditions. The optimum enzyme activity (148.9 ± 4.1 U/mL) was harvested at pH 7.5; temperature, 40 °C and inoculum, 1.5 mL after 48 h incubation. Alkaline protease was immobilization by forming cross linked enzyme aggregates (CLEAs) and the processes of CLEAs formation was also optimized. The protease CLEAs developed using 80% ammonium sulfate, 65 mM glutaraldehyde and 0...
March 3, 2018: International Journal of Biological Macromolecules
Sean T Hunt, Yuriy Román-Leshkov
Conspecuts Commercial and emerging renewable energy technologies are underpinned by precious metal catalysts, which enable the transformation of reactants into useful products. However, the noble metals (NMs) comprise the least abundant elements in the lithosphere, making them prohibitively scarce and expensive for future global-scale technologies. As such, intense research efforts have been devoted to eliminating or substantially reducing the loadings of NMs in various catalytic applications. These efforts have resulted in a plethora of heterogeneous NM catalyst morphologies beyond the traditional supported spherical nanoparticle...
March 6, 2018: Accounts of Chemical Research
Guigui Wan, Taylor Frazier, Julianne Jorgensen, Bingyu Zhao, Charles E Frazier
Background: Mechanical properties of transgenic switchgrass have practical implications for biorefinery technologies. Presented are fundamentals for simple (thermo)mechanical measurements of genetically transformed switchgrass. Experimental basics are provided for the novice, where the intention is to promote collaboration between plant biologists and materials scientists. Results: Stem sections were subjected to two stress modes: (1) torsional oscillation in the linear response region, and (2) unidirectional torsion to failure...
2018: Biotechnology for Biofuels
Kornel Roztocki, Magdalena Lupa, Andrzej Sławek, Wacław Makowski, Irena Senkovska, Stefan Kaskel, Dariusz Matoga
A new microporous cadmium metal-organic framework was synthesized both mechanochemically and in solution by using a sulfonyl-functionalized dicarboxylate linker and an acylhydrazone colinker. The three-dimensional framework is highly stable upon heating to 300 °C as well as in aqueous solutions at elevated temperatures or acidic conditions. The thermally activated material exhibits steep water vapor uptake at low relative pressures at 298 K and excellent recyclability up to 260 °C as confirmed by both quasi-equilibrated temperature-programmed desorption and adsorption (QE-TPDA) method as well as adsorption isotherm measurements...
March 2, 2018: Inorganic Chemistry
Karin Nurme, Enno Merivee, Anne Must, Andrea Di Giulio, Maurizio Muzzi, Ingrid Williams, Marika Mänd
The main purpose of this study was to explain the internal fine structure of potential antennal thermo- and hygroreceptive sensilla, their innervation specifics, and responses of the sensory neurons to thermal and humidity stimuli in an elaterid beetle using focused ion beam scanning electron microscopy and electrophysiology, respectively. Several essential, high temperature induced turning points in the locomotion were determined using automated video tracking. Our results showed that the sensilla under study, morphologically, are identical to the dome-shaped sensilla (DSS) of carabids...
February 2018: Journal of Thermal Biology
Preety, Swati Sharma, Vinita Hooda
A novel chitinase from urd bean (Vigna mungo) seeds was purified up to homogeneity and optimized with respect to its optimum working conditions of pH, temperature, and substrate concentration. Overall, 145-fold purification with 70% yield of the purified chitinase was achieved. The notable features of the purified enzyme were its appreciative substrate affinity as well as catalytic efficiency, high thermo stability (70% retention of initial activity at 70 °C after 60 min of continuous exposure), and pretty good storage stability (half-life of 45 days at 5 °C)...
March 1, 2018: Applied Biochemistry and Biotechnology
Hanhan Xie, Jundong Shao, Yufei Ma, Jiahong Wang, Hao Huang, Na Yang, Huaiyu Wang, Changshun Ruan, Yanfeng Luo, Qu-Quan Wang, Paul K Chu, Xue-Feng Yu
In this paper, we propose a new shape memory polymer (SMP) composite with excellent near-infrared (NIR)-photoresponsive shape memory performance and biodegradability. The composite is fabricated by using piperazine-based polyurethane (PU) as thermo-responsive SMP incorporated with black-phosphorus (BP) sheets as NIR photothermal nanofillers. Under 808 nm light irradiation, the incorporated BP sheets with concentration of only 0.08 wt% enable rapid temperature increase over the glass temperature of PU and trigger the shape change of the composite with shape recovery rate of ∼100%...
February 20, 2018: Biomaterials
Mai Ishikawa, Mayu Kawasaki, Yoshihito Shiono, Takuya Koseki
α-L-Rhamnosyl-β-D-glucosidase (rutinosidase) hydrolyzes the glycosidic linkage between the disaccharide 6-O-α-L-rhamnosyl-β-D-glucoside (rutinose) and the aglycone. We identified a hypothetical protein (annotated as AO090012000917) encoded in the Aspergillus oryzae genome that exhibits sequence similarity with Aspergillus niger rutinosidase. The recombinant enzyme was expressed in Pichia pastoris GS115 and purified as a glyco-protein with apparent molecular mass of 65-75 kDa by SDS-PAGE. After N-deglycosylation, we observed a 42- and 40-kDa band, representing proteins before and after N-terminal signal peptide processing, respectively...
February 23, 2018: Applied Microbiology and Biotechnology
Manish Salgaonkar, Shamraja S Nadar, Virendra K Rathod
The multi-enzyme biocatalyst allows to run in vitro multi-step cascade reactions in a single pot. An efficient combi-metal organic frameworks (combi-MOF) of α-amylase and glucoamylase for one pot starch hydrolysis was constructed by mixing zinc acetate and 2‑methylimmidazole with enzyme mixture in one pot under biocompatible conditions. The prepared combi-MOF was characterized and analyzed by powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM)...
February 16, 2018: International Journal of Biological Macromolecules
Miriam Ezbiri, Michael Takacs, Boris Stolz, Jeffrey Lungthok, Aldo Steinfeld, Ronald Michalsky
Perovskites are attractive redox materials for thermo/electrochemical fuel synthesis. To design perovskites with balanced redox energetics for thermochemically splitting CO2 , the activity of lattice oxygen vacancies and stability against crystal phase changes and detrimental carbonate formation are predicted for a representative range of perovskites by electronic structure computations. Systematic trends in these materials properties when doping with selected metal cations are described in the free energy range defined for isothermal and temperature-swing redox cycles...
August 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
Bingna Huang, Feifei Chen, Yue Shen, Kun Qian, Yan Wang, Changjiao Sun, Xiang Zhao, Bo Cui, Fei Gao, Zhanghua Zeng, Haixin Cui
Pesticides are the basis for defending against major biological disasters and important for ensuring national food security. Biocompatible, biodegradable, intelligent, and responsive materials are currently an emerging area of interest in the field of efficient, safe, and green pesticide formulation. Using nanotechnology to design and prepare targeted pesticides with environmentally responsive controlled release via compound and chemical modifications has also shown great potential in creating novel formulations...
February 11, 2018: Nanomaterials
Zhihua Huang, Zhihong Li, Yongjian Su, Yongfeng Zhu, Wei Zeng, Guiguang Chen, Zhiqun Liang
The coarse perlite 40-80 mesh was selected as an immobilizing material and put into a packed bed reactor (PBR) to continuously convert maltose to isomalto-oligosaccharides (IMOs). The PBR was prepared by mixing the thermo-inactivated cells (TIC) from Aspergillus niger J2 strain with the coarse perlite, then the mixture was put into an overpressure-resistant column. Compared with diatomite 40-80 mesh and thin perlite 80-120 mesh in PBR, coarse perlite was chosen as the best filtration aid, when the ratio of coarse perlite versus TIC was 1:1...
February 13, 2018: Applied Biochemistry and Biotechnology
Danilo Villalta, Federica D'Aurizio, Mirella Da Re, Debora Ricci, Francesco Latrofa, Renato Tozzoli
PURPOSE: Thyrotropin receptor (TSHR) autoantibodies (TRAbs) are a hallmark of Graves' disease (GD). The aim of this study was to evaluate the diagnostic accuracy of a new third generation automatic fluorescence enzyme immunoassay for TRAb measurement in GD, in comparison with two current IMAs. METHODS: Sera of 439 subjects (57 patients with untreated GD, 34 with treated GD, 15 with GD and Graves' orbitopathy, 52 with multinodular non-toxic goiter, 86 with Hashimoto's thyroiditis, 20 with toxic adenoma or toxic multinodular goiter, 55 with non-thyroid autoimmune diseases and 120 normal controls) were tested for TRAbs with the ELiA ™ anti-TSH-R assay (ThermoFischer Scientific, Uppsala, Sweden), the TRAK ™ RIA, Brahms (Thermo Scientific, Hennigsdorf, Germany) and the Immulite ™ TSI assay (Siemens Healthcare, Llanberis, UK)...
February 12, 2018: Auto- Immunity Highlights
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