91,990 results match your criteria solution temperatures


Structure and dynamics of aqueous Norspermidine solutions: An in-situ ultrasonic relaxation spectroscopic study.

J Phys Condens Matter 2021 Sep 20. Epub 2021 Sep 20.

Chemistry, University of Ioannina, University campus, Ioannina, 45110, GREECE.

An in-situ ultrasonic relaxation spectroscopic study is presented in an effort to determine the structural changes and the dynamics involved when norspermidine (NSpd) is dissolved in water. Our aim is to elucidate the mechanism responsible for the observed relaxation mechanism in acoustic spectra and estimate the corresponding thermodynamic parameters and the associated volume change. The experimental spectra of aqueous NSpd solutions revealed a single Debye-type relaxation mechanism attributed to proton-transfer reaction. Read More

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September 2021

Exploring Curious Covalent Bonding: Raman Identification and Thermodynamics of Perpendicular and Parallel Pancake Bonding (Pimers) of Ethyl Viologen Radical Cation Dimers.

J Phys Chem B 2021 Sep 20. Epub 2021 Sep 20.

Department of Chemistry and NanoQAM, Université du Québec à Montréal, Case Postale 8888, Succursale Centre-Ville, Montreal, Quebec H3C 3P8, Canada.

Viologen radical cations can dimerize in solutions, and the resulting "pimers" were predicted to assemble into parallel and perpendicular conformers by density functional theory (DFT) calculations. Using resonance Raman, we could identify both perpendicular and parallel forms of ethyl viologen dimers. The distinction between the two forms was accomplished by studying the formation of a host-guest complex with γ-cyclodextrin. Read More

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September 2021

A Multiple Excited-State Engineering of Boron-Functionalized Diazapentacene Via a Tuning of the Molecular Orbital Coupling.

J Phys Chem Lett 2021 Sep 20:9308-9314. Epub 2021 Sep 20.

School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China.

Harvesting high-energy excited-state energy is still challenging in organic chromophores. An introduction of boron atoms along the short axis of the diazapentacene backbone induces multiple emission characteristics. Our studies reveal that the weak molecular orbital (MO) coupling of the S-S transition is responsible for the slow internal conversion rates. Read More

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September 2021

Dissecting Monomer-Dimer Equilibrium of an RNase P Protein Provides Insight Into the Synergistic Flexibility of 5' Leader Pre-tRNA Recognition.

Front Mol Biosci 2021 3;8:730274. Epub 2021 Sep 3.

Department of Chemistry, Marquette University, Milwaukee, WI, United States.

Ribonuclease P (RNase P) is a universal RNA-protein endonuclease that catalyzes 5' precursor-tRNA (ptRNA) processing. The RNase P RNA plays the catalytic role in ptRNA processing; however, the RNase P protein is required for catalysis and interacts with the 5' leader sequence. A single P RNA and a P protein form the functional RNase P holoenzyme yet dimeric forms of bacterial RNase P can interact with non-tRNA substrates and influence bacterial cell growth. Read More

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September 2021

Effect of Ag alloying and trace precipitation on corrosion resistance of Ti-Ta-Ag ternary alloy.

R Soc Open Sci 2021 Sep 15;8(9):210243. Epub 2021 Sep 15.

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, People's Republic of China.

This work systematically analysed the electrochemical and corrosion behaviour of Ti-Ta-Ag ternary alloy samples in Hank's solution. For the samples with 1.5% and 3% Ag content, the sintering temperature increased from 750 to 950°C, and the corresponding corrosion resistance increased by 100 times due to the increased alloying of Ag; meanwhile for the sample with 4. Read More

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September 2021

Co-precipitation of anthocyanin in PHBV by the SEDS technique.

J Food Sci Technol 2021 Nov 22;58(11):4217-4224. Epub 2020 Nov 22.

Department of Chemical and Food Engineering, UFSC, Florianópolis, SC 88040-900 Brazil.

Anthocyanins are pigments of plant origin responsible for most blue, purple and all shades of red found in flowers, fruits and some stems and roots of plants, besides comprising a class of potent antioxidant phenolic compounds. Due to the relevance of anthocyanins this work aims to encapsulate anthocyanin extracted from the wine lees through the Solution Enhanced Dispersion by Supercritical Fluids (SEDS) technique and to evaluate the thermal stability of encapsulated versus non-encapsulated anthocyanin. The highest encapsulation efficiency obtained was approximately 66%. Read More

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November 2021

Characterization of Ferromagnetic Composite Implants for Tumor Bed Hyperthermia.

IEEE Trans Magn 2021 Sep 16;57(9). Epub 2021 Jul 16.

National Medical Research Radiological Center, Moscow, Russia.

Hyperthermia therapy (HT) is becoming a well-recognized method for the treatment of cancer when combined with radiation or chemotherapy. There are many ways to heat a tumor and the optimum approach depends on the treatment site. This study investigates a composite ferromagnetic surgical implant inserted in a tumor bed for the delivery of local HT. Read More

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September 2021

A study of various chemical pretreatments to fractionate lipids from whey protein phospholipid concentrate.

J Dairy Sci 2021 Sep 15. Epub 2021 Sep 15.

Department of Food Science, University of Wisconsin-Madison, Madison 53706; Center for Dairy Research, University of Wisconsin-Madison, Madison 53706.

Dairy-derived lipids such as phospholipids (PL) have been gaining interest due to their functional and nutritional properties. Our research goal was to develop a separation process (nonsolvent based) to produce an enriched dairy lipid fraction from whey protein phospholipid concentrate (WPPC). Various chemical pretreatments (i. Read More

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September 2021

Characterization of Electrospray Drop Size Distributions by Mobility-Classified Mass Spectrometry: Implications for Ion Clustering in Solution and Ion Formation Pathways.

Anal Chem 2021 Sep 19. Epub 2021 Sep 19.

Institute of Particle Technology, Friedrich Alexander University Erlangen Nuremberg, Interdisciplinary Center for Functional Particle Systems (FPS), Haberstr. 9a, 91058 Erlangen, Germany.

One of the outcomes of electrospray ionization is the size distribution of the droplets, which determines, together with the solvent composition and the source gas temperature, the minimum distance from the sprayer tip to the mass spectrometer inlet and therefore the ion transfer efficiency. Even more importantly, the average number of analyte molecules and, if present, contaminant species per droplet depend on the drop size. Consequently, the drop size distribution is a key parameter in nonspecific ion clustering in solution and ion suppression. Read More

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September 2021

A green energy research: forecasting of wind power for a cleaner environment using robust hybrid metaheuristic model.

Environ Sci Pollut Res Int 2021 Sep 18. Epub 2021 Sep 18.

Faculty of Science, Eng. and Technology, Swinburne University of Technology, Melbourne, Australia.

Wind is a stochastic and intermittent renewable energy source. Due to its nature, it is extremely hard to forecast wind power. Accurate wind power forecasting can be encouraging and motivating for investors to shed light on future uncertainties caused by global warming. Read More

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September 2021

Restoring phosphorus from water to soil: Using calcined eggshells for P adsorption and subsequent application of the adsorbent as a P fertilizer.

Chemosphere 2021 Sep 16;287(Pt 3):132267. Epub 2021 Sep 16.

Department of Integrated System Engineering, Hankyong National University, Anseong, 17579, Republic of Korea; Department of Bioresources and Rural System Engineering, Hankyong National University, Anseong, 17579, Republic of Korea. Electronic address:

This study investigated the solution for two environmental issues: excess of P in water and its deficiency in soil, which is restored by transferring the adsorbed P from water into the soil using eggshell as an adsorbent. The eggshells were calcined at different temperatures to improve their adsorption capacity, and evaluated for their physical/chemical properties and P adsorption capacity. The eggshells calcined at 800 °C (CES-800) had the highest P adsorption; CaCO decomposed into 23. Read More

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September 2021

Green antimicrobial adsorbent containing grafted xanthan gum/SiO nanocomposites for malachite green dye.

Int J Biol Macromol 2021 Sep 16. Epub 2021 Sep 16.

Organic Nanomaterials Lab, Department of Chemistry, Hannam University, Daejeon 34054, Republic of Korea.

Recently, removal of synthetic dyes, especially cationic dye of malachite green (MG), and inhibition of the growth of pathogenic microorganism from drinking water have gained much interest due to their high toxic potency for aquatic biosystems. Herein, a new dye adsorbent with outstanding antibacterial activity was fabricated based on xanthan gum (XG) and SiO nanoparticles through ultrasonication followed by the crosslinking polymerization with vinyl imidazole monomer. The nano adsorbents were characterized with various techniques such as FTIR, XRD, SEM, EDX, and TEM. Read More

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September 2021

Electrophoretic deposition of collagen/chitosan films with copper-doped phosphate glasses for orthopaedic implants.

J Colloid Interface Sci 2021 Sep 1;607(Pt 1):869-880. Epub 2021 Sep 1.

Centre for Energy, Materials and Telecommunications, Institut National de la Recherche Scientifique, 1650 Boulevard Lionel-Boulet Varennes, Québec J3X 1S2, Canada. Electronic address:

Coatings with bioactive properties play a key role in the success of orthopaedic implants. Recent studies focused on composite coatings incorporating biocompatible elements that can increase the nucleation of hydroxyapatite (HA), the mineral component of bone, and have promising bioactive and biodegradable properties. Here we report a method of fabricating composite collagen, chitosan and copper-doped phosphate glass (PG) coatings for biomedical applications using electrophoretic deposition (EPD). Read More

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September 2021

Resolving small distance variations by single-molecule FRET & EPR spectroscopy using rotamer libraries.

Biophys J 2021 Sep 15. Epub 2021 Sep 15.

Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland.

Förster Resonance Energy Transfer (FRET) and Electron Paramagnetic Resonance (EPR) spectroscopy are complementary techniques for quantifying distances in the nanometer range. Both approaches are commonly employed for probing the conformations and conformational changes of biological macromolecules based on site-directed fluorescent or paramagnetic labeling. FRET can be applied in solution at ambient temperature and thus provides direct access to dynamics, especially if used at the single-molecule level, while EPR requires immobilization or work at cryogenic temperatures but provides data that can be more reliably used to extract distance distributions. Read More

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September 2021

Efficacy of the Antigenicity-Retaining Ability of Fixative Solutions for Liquid-Based Cytology: Immunocytochemistry of Long-Term Storage.

Acta Cytol 2021 Sep 14:1-12. Epub 2021 Sep 14.

Department of Pathology, Nara Medical University Hospital, Nara, Japan.

Introduction/objective: Liquid-based cytology (LBC) is advantageous as multiple stained specimens can be prepared and used for additional assays such as immunocytochemical and molecular-pathological investigations. Two types of preservative-fixative solutions (fixatives) are used for nongynecologic specimens used in the BD SurePath-LBC (SP-LBC) method, and their components vary. However, few studies have evaluated the differences in antigen-retaining ability between these fixatives. Read More

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September 2021

Dopant-assisted atmospheric pressure photoionization Orbitrap mass spectrometry - An approach to molecular characterization of lignin oligomers.

Anal Chim Acta 2021 Sep 9;1179:338836. Epub 2021 Jul 9.

Core Facility Center "Arktika", M.V. Lomonosov Northern (Arctic) Federal University, Northern Dvina Emb. 17, Arkhangelsk, 163002, Russia.

Lignin is the second most abundant biopolymer in nature and is considered an important renewable source of aromatic compounds. One of the most promising analytical methods for molecular characterization of lignin is Orbitrap high-resolution mass spectrometry with atmospheric pressure photoionization (APPI), proved itself in the study of lignins of various origins and their depolymerization products. In this work, the photoionization of lignin using acetone, 1,4-dioxane, and THF as solvents for the biopolymer and APPI dopants providing the generation of protonated and deprotonated molecules of lignin oligomers has been studied. Read More

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September 2021

Difference in temporal and spatial distribution pattern of cyanobacteria between the sediment and water column in Lake Chaohu.

Environ Pollut 2021 Sep 11;291:118163. Epub 2021 Sep 11.

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China. Electronic address:

The evaluation about the relative distribution of cyanobacterial biomass between the sediment and water column would be indispensable to understand if benthic cyanobacteria are important to cyanobacterial biomass in the water column. A separation method for the rapid quantification of benthic cyanobacteria in Lake Chaohu was developed by density-gradient centrifugation. A 2 full factorial design and response surface methodology was employed to optimize the extraction protocol. Read More

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September 2021

A machine learning model for early detection of diabetic foot using thermogram images.

Comput Biol Med 2021 Sep 9;137:104838. Epub 2021 Sep 9.

Weill Cornell Medicine-Qatar, Ar-Rayyan, Qatar.

Diabetes foot ulceration (DFU) and amputation are a cause of significant morbidity. The prevention of DFU may be achieved by the identification of patients at risk of DFU and the institution of preventative measures through education and offloading. Several studies have reported that thermogram images may help to detect an increase in plantar temperature prior to DFU. Read More

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September 2021

Sub-nanometer Thick Wafer-size NiO Films with Room-temperature Ferromagnetic Behavior.

Angew Chem Int Ed Engl 2021 Sep 17. Epub 2021 Sep 17.

Soochow University, Department of Energy, 688 Moye Rd., 215000, Suzhou, CHINA.

Adding ferromagnetism into semiconductors attracts much attentions due to its potential usage of magnetic spins in novel devices, such as spin field-effect transistors. However, it remains challenging to stabilize their ferromagnetism above room temperature. Here we introduce an atomic chemical-solution strategy to grow wafer-size NiO thin films with controllable thickness down to sub-nanometer scale of 0. Read More

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September 2021

Example of Removing Printing Ink from Plastic Surface Using Quaternary Ammonium Modified Waste Cooking Oil.

Environ Technol 2021 Sep 17:1-22. Epub 2021 Sep 17.

Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian, 350108, PR China.

The printing ink on the plastic surface will greatly reduce the quality of recycled plastic products. In this work, quaternary ammonium modified waste cooking oil (WCOQE) was fabricated using waste cooking oil, epichlorohydrin and trimethylamine aqueous solution as raw materials, through ring-opening esterification and quaternary amination reaction. The synthesis conditions of WCOQE were optimized, and the structure and properties of WCOQE were characterized by FTIR, zeta potential and H NMR. Read More

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September 2021

Mechanism of catalytic ozonation in expanded graphite aqueous suspension for the degradation of organic acids.

Environ Technol 2021 Sep 17:1-36. Epub 2021 Sep 17.

State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.

In this study, expanded graphite (EG) was prepared by the oxidation and intercalation of the natural flake graphite using perchloric acid and potassium permanganate at different expansion temperatures (300 °C, 400 °C, 500 °C, and 600 °C), and were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). EG prepared at 500 °C was found to be highly effective for the mineralization of oxalic acid aqueous solution during ozonation at pH 3, which was ascribed to the formation of hydroxyl radicals from surface reaction of surface hydroxyl groups on EG with ozone. The performance of expanded graphite in this catalytic system was basically unchanged after three repeated use. Read More

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September 2021

Thin Thermoresponsive Polymer Films for Cell Culture: Elucidating an Unexpected Thermal Phase Behavior by Atomic Force Microscopy.

Langmuir 2021 Sep 17. Epub 2021 Sep 17.

Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 8-2 Trubetskaya Street, Moscow 119991, Russia.

Application of poly--isopropylacrylamide (PNIPAM) and its more hydrophobic copolymers with --butylacrylamide (NtBA) as supports for cell sheets has been validated in numerous studies. The binary systems of these polymers with water are characterized by a lower critical solution temperature (LCST) in a physiologically favorable region. Upon lowering the temperature below the LCST, PNIPAM chains undergo a globule-to-coil transition, causing the film dissolution and cell sheet detachment. Read More

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September 2021

W-Doped TiO Nanorods for Multimode Tumor Eradication in Osteosarcoma Models under Single Ultrasound Irradiation.

ACS Appl Mater Interfaces 2021 Sep 17. Epub 2021 Sep 17.

Department of Orthopedic Surgery, Shanghai Jiao Tong University affiliated Sixth People's Hospital, Shanghai 200233, China.

Sonosensitizers play crucial roles in the controlled production of reactive oxygen species (ROS) under ultrasound (US) irradiation with high tissue-penetration depth for noninvasive solid tumor therapy. It is desirable to fabricate structurally simple yet multifunctional sonosensitizers from ultrafine nanoparticles for ROS-based multimode therapy to overcome monomode limitations such as low ROS production yields and endogenous reductive glutathione (GSH) to ROS-based treatment resistance. We report the facile high-temperature solution synthesis of ultrafine W-doped TiO (W-TiO) nanorods for exploration of their sonodynamic, chemodynamic, and GSH-depleting activities in sonodynamic-chemodynamic combination tumor therapy. Read More

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September 2021

Leaching behavior and environmental safety evaluation of fluorine ions from shotcrete with high-fluorine alkali-free liquid accelerator.

Environ Sci Pollut Res Int 2021 Sep 17. Epub 2021 Sep 17.

College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, Shaanxi, People's Republic of China.

High-fluorine alkali-free liquid accelerator (AF, F concentration was about 2.31g/L) was still used in engineering because of its low cost, excellent stability, and coagulation-promoting effect. The main purpose of this study was to explore the leaching behavior of fluorine ions in shotcrete for tunnel lining with high-fluorine alkali-free liquid accelerator and whether there was fluoride pollution. Read More

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September 2021

First Report of Leaf Spot Disease On Microstegium vimineum Caused by Bipolaris setariae in China.

Plant Dis 2021 Sep 17. Epub 2021 Sep 17.

Tongwei RoadNanjing, China, 210095;

Microstegium vimineum, a Poaceae annual C4 plant, occurred widely in crop fields, tea gardens, orchards, under forests and roadsides in most provinces and regions south of the Yellow River, China. It was introduced into the eastern USA causing ecological and environmental damage (Stricker, 2016). In October 2015, M. Read More

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September 2021

Ophthalmic Nanoemulsions: From Composition to Technological Processes and Quality Control.

Mol Pharm 2021 Sep 17. Epub 2021 Sep 17.

Department of Drug Form Technology, Wroclaw Medical University, Borowska 211 A, 50-556 Wroclaw, Poland.

Nanoemulsions are considered as the most promising solution to improve the delivery of ophthalmic drugs. The design of ophthalmic nanoemulsions requires an extensive understanding of pharmaceutical as well as technological aspects related to the selection of excipients and formulation processes. This Review aims at providing the readers with a comprehensive summary of possible compositions of nanoemulsions, methods for their formulation (both laboratory and industrial), and differences between technological approaches, along with an extensive outline of the research methods enabling the confirmation of properties, pharmaceutical performance, and biological activity of the obtained product. Read More

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September 2021

Facile synthesis of lactoferrin conjugated ultra small large pore silica nanoparticles for the treatment of glioblastoma.

Nanoscale 2021 Sep 17. Epub 2021 Sep 17.

School of Pharmacy, The University of Queensland, Brisbane, QLD, 4102, Australia.

The blood brain barrier (BBB) and blood tumour barrier (BTB) remain a major roadblock for delivering therapies to treat brain cancer. Amongst brain cancers, glioblastoma (GBM) is notoriously difficult to treat due to the challenge of delivering chemotherapeutic drugs across the BBB and into the tumour microenvironment. Consequently, GBM has high rates of tumour recurrence. Read More

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September 2021

Low temperature plasma irradiation products of sodium lactate solution that induce cell death on U251SP glioblastoma cells were identified.

Sci Rep 2021 Sep 16;11(1):18488. Epub 2021 Sep 16.

Center for Low-Temperature Plasma Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.

Low-temperature plasma is being widely used in the various fields of life science, such as medicine and agriculture. Plasma-activated solutions have been proposed as potential cancer therapeutic reagents. We previously reported that plasma-activated Ringer's lactate solution exhibited selective cancer-killing effects, and that the plasma-treated L-sodium lactate in the solution was an anti-tumor factor; however, the components that are generated through the interactions between plasma and L-sodium lactate and the components responsible for the selective killing of cancer cells remain unidentified. Read More

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September 2021

Activation of anionic redox in d transition metal chalcogenides by anion doping.

Nat Commun 2021 Sep 16;12(1):5485. Epub 2021 Sep 16.

Collège de France, Chaire de Chimie du Solide et de l'Energie, UMR 8260, 11 Place Marcelin Berthelot, 75231 Cedex 05, Paris, France.

Expanding the chemical space for designing novel anionic redox materials from oxides to sulfides has enabled to better apprehend fundamental aspects dealing with cationic-anionic relative band positioning. Pursuing with chalcogenides, but deviating from cationic substitution, we here present another twist to our band positioning strategy that relies on mixed ligands with the synthesis of the LiTiSSe solid solution series. Through the series the electrochemical activity displays a bell shape variation that peaks at 260 mAh/g for the composition x = 0. Read More

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September 2021

Viscosity changes and gel formation during storage of liquid micellar casein concentrates.

J Dairy Sci 2021 Sep 13. Epub 2021 Sep 13.

Southeast Dairy Foods Research Center, North Carolina State University, Raleigh 27695.

Our objective was to determine the effects of temperature and protein concentration on viscosity increase and gelation of liquid micellar casein concentrate (MCC) at protein concentrations from 6 to 20% during refrigerated storage. Skim milk (~350 kg) was pasteurized (72°C for 16 s) and filtered through a ceramic microfiltration system to make MCC and replicated 3 times. The liquid MCC was immediately concentrated via a plate ultrafiltration system to 18% protein (wt/wt). Read More

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September 2021