bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of Acoustical Parameters of Aqueous Solution of Kolliphors Binary Mixtures Using Density, Speed of Sound, Viscosity, and Surface Tension Measurements
Authors: Szymczyk Katarzyna , Szaniawska Magdalena , Terpiłowski Konrad 
Published: August 2019

AbstractMeasurements of density, speed of sound, and surface tension as well as viscosity of aqueous Kolliphor® ELP (ELP) and Kolliphor® RH 40 (RH40) solutions as well as binary mixtures at different surfactant mole fractions were made at 293 K to investigate their aggregation behavior. The free volume, internal pressure, and molar cohesive energy were calculated and compared to the specific acoustic impedance and intermolecular free length to obtain qualitative information about the character of interactions between the surfactant molecules in the mixture through the water phase.
Production and Characterization of Surface‐Active Lipopeptides by Haloalkaliphilic Bacteria Salibacterium sp. 4CTb
Authors: Barbachano‐Torres Alejandra , López‐Ortega Mayra A. , Delgado‐García Mariana , González‐García Yolanda , Rodríguez Jorge A. , Kirchmayr Manuel R. , Camacho‐Ruíz Rosa M. 
Published: August 2019

AbstractSurface‐Active Biomolecules (SAB) obtained from microbial sources are safe alternatives to chemically synthesized counterparts for many environmental and industrial applications. These applications frequently involve the exposure of the SAB to extreme factors making necessary to seek for molecules that are able to function under such conditions. In this work, the polyextremophilic bacterium Salibacterium sp. 4CTb is reported as a SAB producer. Its emulsifier activity increased almost twofold when the C/N ratio and culture conditions were modified. The partially purified molecule was able to form stable emulsions under extreme conditions (70 °C, pH 12, and 4 M NaCl) better than other commercial molecules, and reduced the surface tension of the water to 49.78 mN m−1 with critical micelle concentration (CMC) of 15.1 mg L−1. Carbohydrate, lipid, and protein assays, accompanied by the Fourier Transform Infra‐Red (FTIR) and electrospray ionization mass spectroscopy (ESI‐MS) results, indicate the lipopeptide nature of the compound with masses around 645 and 746 Da. The SAB obtained from Salibacterium sp. 4CTb may be suitable for electrical, food, pharmaceutical and cosmetic industries, agriculture, and environmental applications, among others.
Enzymatic hydrolysis increases ginsenoside content in Korean red ginseng (Panax ginseng CA Meyer) and its biotransformation under hydrostatic pressure
Authors: Kim Hyo Won , Han Sung Hee , Lee Seog‐Won , Choi Hyeon‐Son , Suh Hyung Joo , Hong Ki‐Bae 
Published: August 2019

AbstractBACKGROUNDEnzymatic hydrolysis and high hydrostatic pressure (HHP) are common processing techniques in the extraction of active compounds from food materials. The aim of this study was to investigate the effects of enzymatic hydrolysis combined with HHP treatments on ginsenoside metabolites in red ginseng.RESULTSThe yield and changes in the levels of polyphenol and ginsenoside were measured in red ginseng treated with commercial enzymes such as Ultraflo L, Viscozyme, Cytolase PCL5, Rapidase and Econase E at atmospheric pressure (0.1 MPa), 50 MPa, and 100 MPa. β‐Glucosidase activity of Cytolase was the highest at 4258.2 mg−1, whereas Viscozyme showed the lowest activity at 10.6 mg−1. Pressure of 100 MPa did not affect the stability or the activity of the β‐glucosidase. Treatment of red ginseng with Cytolase and Econase at 100 MPa significantly increased the dry weight and polyphenol content of red ginseng, compared with treatments at 0.1 MPa and 50 MPa (P < 0.05). The amounts of ginsenoside and ginsenoside metabolites derived from red ginseng processed using Cytolase were higher than those derived from red ginseng treated with the other enzymes. Treatment with Cytolase also significantly increased the skin and intestinal permeability of red ginseng‐derived polyphenols.CONCLUSIONCytolase could be useful as an enzymatic treatment to enhance the yield of bioactive compounds from ginseng under HHP. In addition, ginsenoside metabolites obtained by Cytolase hydrolysis combined with HHP are functional substances with increased intestinal and skin permeability. © 2019 Society of Chemical Industry
Strong effects of elevated CO2 on freshwater microalgae and ecosystem chemistry
Authors: Brown Terry‐René W. , Lajeunesse Marc J. , Scott Kathleen M. 
Published: August 2019

AbstractThe carbonate chemistry of freshwater systems can range from inorganic carbon‐limited to supersaturated with respect to the atmosphere, and the pH of these systems can vary temporally and spatially from alkaline to acidic. Determining how these heterogeneous systems respond to increases in atmospheric CO2 is critical to understanding global impacts of these changes. Here, we synthesize 22 studies from a variety of systems to explore the effects of elevated CO2 on freshwater chemistry and microalgae, which form the base of autotrophic food webs. Across the variability in freshwater systems, elevated CO2 significantly affected water chemistry by decreasing pH and increasing dissolved inorganic carbon. Microalgae were also affected by elevated CO2 with measured increases in (1) nutrient acquisition through microalgal carbon‐to‐nutrient ratios, (2) photosynthetic activity, and (3) growth. While these effects were measured from controlled experiments, the results indicate a wide range of potential freshwater ecosystem effects from elevated atmospheric CO2. Our synthesis also identified several knowledge gaps. Generally, larger sample sizes and studies of longer duration are needed for more robust analyses and conclusions. Additionally, more field experiments across a range of freshwater ecosystem types and studies involving benthic species and multiple trophic levels are needed to strengthen global predictions across the broad variability found within and among freshwater systems.
The autonomous clean environmental (ACE) sampler: A trace‐metal clean seawater sampler suitable for open‐ocean time‐series applications
Authors: van der Merwe Pier , Trull Thomas W. , Goodwin Trevor , Jansen Peter , Bowie Andrew 
Published: August 2019

AbstractThe fundamental role of the micronutrient Fe in controlling phytoplankton growth in large parts of Earth's oceans and a lack of information on seasonal transitions in remote regions motivated us to create an autonomous water sampler capable of collecting uncontaminated open‐ocean seawater samples with monthly resolution over a full annual cycle. Phytoplankton are at the base of the food chain, which take up carbon dioxide through photosynthesis. Assessing Fe availability is essential to understanding both ocean productivity and our climate. This need is particularly important in the Southern Ocean, where Fe limitation is wide spread and access is difficult especially in winter. To address this need, we have developed an autonomous system capable of observing iron concentrations over a full seasonal cycle, at the subnanomolar concentrations that are important in the open ocean. The automated clean environmental sampler has been developed initially for 1‐yr deployments on oceanographic moorings. Twelve samples per unit can be programmed to collect 65 mL of seawater through a noncontaminating, primarily Teflon sample path. The system is vaned to maintain its intake tubes in upstream water and has been tested to 100 m depth. The system was deployed during a GEOTRACES section (SR3 line, GS01) in 2018 alongside an industry standard, trace metal clean rosette, and no significant difference was found in Fe concentrations in the 50 pmol L–1 range, proving its capability at collecting uncontaminated seawater samples in the open ocean at temperatures above 0°C.
Increased Dairy Product Intake Alters Serum Metabolite Profiles in Subjects at Risk of Developing Type 2 Diabetes
Authors: O'Connor Sarah , Greffard Karine , Leclercq Mickael , Julien Pierre , Weisnagel Stanley John , Gagnon Claudia , Droit Arnaud , Bilodeau Jean‐François , Rudkowska Iwona 
Published: August 2019

ScopeMetabolomics is increasingly used to identify biomarkers of diet or chronic diseases, such as type 2 diabetes. Yet, metabolite signatures following dairy intake in hyperinsulinemic subjects have not been identified. The objective is to evaluate the effects of a high dairy diet (HD) for 6 weeks (4 servings or more per day), compared with an adequate dairy diet (AD) (2 servings or less per day), on serum metabolite profiles in hyperinsulinemic adults.Methods and resultsIn this crossover trial, subjects are randomized to HD or AD for 6 weeks. Serum metabolites are assessed using GC/MS. Twenty‐six subjects completed the study. Levels of pentadecanoic acid, tyrosine and lathosterol are increased in HD, while 1,5‐anhydrosorbitol, myo‐inositol, 3‐aminoisobutyric acid and beta‐sitosterol are decreased (p< 0.05). Sorbitol levels are increased after AD, while hexanoic acid, lauric acid, l‐kynurenine, methionine, and benzoic acid levels are reduced (p< 0.05). Histidine, caprylic acid, nonanoic acid, decanoic acid, lauric acid, heptadecanoic acid, and benzoic acid levels are increased in HD compared to AD, while malic acid levels are increased in AD compared with HD (p< 0.05).ConclusionHigher dairy products intake modifies metabolite profiles in hyperinsulinemic subjects.
Single‐center experience suggests donor lymphocyte infusion may promote long‐term survival in children with high‐risk acute lymphoblastic leukemia
Authors: Liberio Nicole , Robinson Haley , Nugent Melodee , Simpson Pippa , Margolis David A. , Malarkannan Subramaniam , Keever‐Taylor Carolyn , Thakar Monica S. 
Published: August 2019

AbstractBackground Donor lymphocyte infusion (DLI) is often used to treat leukemic relapse after hematopoietic cell transplantation (HCT). However, the relationship between outcomes and distinct DLI cellular composition has not been previously reported. Additionally, there are limited published data on efficacy in pediatrics. We evaluated whether DLI cellular content and development of graft‐versus‐host disease (GVHD) impacted disease and influenced overall survival (OS) in children receiving DLI for recurrent leukemia.MethodsWe performed an Institutional Review Board–approved, retrospective study investigating all consecutive DLIs given to patients at the Children's Hospital of Wisconsin between 1980 and 2018. Analyses were conducted using Mann–Whitney, Fisher exact, and chi‐square tests.Results Thirty patients ≤20 years old with hematologic malignancies (myeloid [AML/MDS/CML/JMML], n = 23; lymphoid [ALL], n = 7) received DLI to treat post‐transplant relapse. We found no significant difference in OS or development of GVHD based on CD3, CD4, CD8, CD56, or CD19 DLI cellular composition. With a median follow‐up of 0.69 (range, 0.04–16.61) years, OS at five years was 32% ± 9%. The lymphoid group had a five‐year survival rate at 71% ± 17% compared with the myeloid group at 22% ± 9%, although not statistically significant (P = 0.11). The development of GVHD did not affect OS (P = 0.62).Conclusion Here, we report a single‐center, long‐term experience of pediatric DLIs. Surprisingly, many children with ALL were able to achieve durable remissions. Although cellular composition did not have a significant effect on GVHD or OS in our small study, engineering DLI products to maximize specific effector cell populations could be one strategy to improve efficacy.
Deposition of 2‐oxazoline‐based plasma polymer coatings using atmospheric pressure helium plasma jet
Authors: Al‐Bataineh Sameer A. , Cavallaro Alex A. , Michelmore Andrew , Macgregor Melanie N. , Whittle Jason D. , Vasilev Krasimir 
Published: August 2019

AbstractWe report on the use of helium plasma jet for plasma polymerisation of 2‐methyl‐2‐oxazoline (OX) on heated silicon substrates. The X‐ray photo electron spectroscopy (XPS) characterisation shows a substantial improvement in film stability in buffer solution when depositing at temperatures above 50°C. Principal component analysis of the time‐of‐flight–secondary ion mass spectrometry data shows excellent correlation with the XPS results, providing insights into the degree of crosslinking in the plasma coatings as a function of substrate temperature. Atomic force microscopy images showed the topography of OX plasma polymer coatings deposited at 80°C and 120°C to be smoother with lower surface roughness values compared to those produced at 50°C. Finally, an 80% reduction in the adhesion of Staphylococcus epidermidis is achieved at the centre of the plasma coatings deposited at 120°C.
The Role of Gold‐Alumina Template in the Electrochemical Deposition of CeO2 Nanotubes
Authors: González‐Souto Lorena , González‐Rovira Leandro , Botana Francisco Javier , Calvino José Juan , Cauqui Miguel Ángel , Hernández‐Garrido Juan Carlos 
Published: August 2019

AbstractElectrochemical synthesis employing porous membranes previously metalized with a gold layer as a template is an easy and widespread method to obtain 1D nanostructures. Nevertheless, experimental factors for tuning the morphology and structural details of such nanostructures are still investigated. The influence of the amount of gold on morphology and structure of the 1D systems is studied for the first time. For this purpose, CeO2 nanotubes are synthesized via template‐based electrodeposition inside the pores of gold‐sputtered anodic aluminum oxide (AAO). X‐ray diffraction and electron microscopy techniques, including 3D electron tomography, are applied for the characterization of the template and the nanostructures. On one hand, the results reveal how gold is deposited on top and inside the pores of the AAO as a thin layer or as particles. On the other hand, the 1D systems consist of nanotubes formed by randomly oriented fluorite‐like nanocrystals (2–5 nm), which features a network of inner walls whose compactness directly relates to the thickness of the gold‐sputtered layer. From the combined analysis of voltage–time curves recorded during electrodeposition and the 2D, 3D structural information, a growth mechanism is proposed, which may enlighten paths to tailor the morphology and properties of CeO2 1D nanostructures.
Heat of Formation of ADN‐Based Liquid Monopropellants
Authors: Wingborg Niklas 
Published: August 2019

AbstractEnergetic ionic liquids have obtained substantial attention the last decades as less toxic, or green, monopropellants to replace the carcinogenic and toxic hydrazine. Among the most promising hydrazine substitutes are propellants based on ammonium dinitramide, ADN, dissolved in a fuel/water mixture. These types of propellants are single phase mixtures, and thus their heats of formation are influenced by the heats of solution and heats of mixing of the respective components used. These enthalpy contributions have been measured for three different ADN‐based propellants (LMP‐103S, FLP‐106 and FLP‐107) and their specific impulses have been calculated. The results show that ADN heat of solution must be considered in order to accurately calculate the specific impulse.
A personalized preoperative modeling system for internal fixation plates in long bone fracture surgery—A straightforward way from CT images to plate model
Authors: Liu Bin , Zhang Song , Zhang Jianxin , Xu Zhao , Chen Yanjie , Liu Shujun , Qi Wen , Yang Liang 
Published: August 2019

AbstractBackgroundLong bone fractures are a type of physical damage with high incidence rates that have serious impacts on the normal lives of humans.AimsHow to obtain a preoperative internal fixation plate model before cutting muscle has become a critical issue.Materials and MethodsIn this paper, we present a new personalized modeling system for internal fixation plates in long bone fracture surgery. This system can achieve straight semi‐automatic processing from CT images to 3D models. First, broken bones are separated in CT images. Second, the axes of long broken bones are extracted using 3D models. Third, the vertices on the broken bone cross‐sections are segmented. Fourth, rough alignment and fine registration are implemented.ResultsAn internal fixation plate is reconstructed for a long bone fracture.DiscussionThree validations indicate that this method framework is reasonable and feasible.ConclusionThis system can provide technical support for the personalized, minimally invasive and accurate operation on long bone fractures.
Reduced Graphene Oxide and Pd Nanocomposite as a Catalyst for Oxygen Reduction Reaction in Rechargeable Li‐Oxygen Battery
Authors: Kumar Surender , Kumar Satendra , Kumar Divyaratan , Sathish N. , Singh Archana , Goswami Manoj 
Published: August 2019

AbstractPd+2 ions are reduced on two‐dimensional reduced graphene oxide nanosheets in aqueous phase by NaBH4 as reducing agent. Pd nanoparticles are uniformly grown on graphene sheets in 5–15 nm range, verified by TEM investigation. Oxygen reduction reaction (ORR) is carried in nonaqueous medium by using rotating disk electrode technique. For comparison, ORR activity of pure RGO is also studied; ORR follows one e− pathway (O2 + e−=O2−) in non‐aqueous electrolyte. Pd‐RGO has ORR activity five times more as compared to pure RGO in 0.10 M TBAP‐DMSO solution. Pd‐RGO catalyst is used to assemble the non‐aqueous Li‐O2 batteries and charge‐discharge cycling is carried out. At 0.20 mA cm−2 the discharge capacity of 8192 mAh g−1 is obtained. Overpotential for ORR (or discharge) step is 260 mV. This is first report on reaction chemistry in Li‐O2 battery using Pd nanoparticles. Li2O2 and Li2O are confirmed as discharged products by ex‐situ XRD studies.
A Series of Umbrella‐Shape Copper‐Lanthanides Based Mixed Metallic Coordination Complexes
Authors: Gorantla N. V. T. Sai Manoj , Kushvaha Saroj Kumar , Mandal Rajkumar , Mondal Kartik Chandra 
Published: August 2019

AbstractA series of six hetero‐bimetallic complexes having umbrella shape topology and general formula (L)2CuLn(NO3)(Ph3PO) have been synthesized by reacting a methanolic solution of diprotic ligand (H2L) [(E)‐2‐(((2‐hydroxyphenyl)imino)methyl)‐6‐methoxyphenol] and co‐ligand Ph3P=O with CuCl2.2H2O and Ln(NO3)3⋅6H2O (Ln= Gd(1), Tb(2),Dy(3), Ho(4), Er(5) and Y(6)) in the presence of triethylamine base. The iso‐structural complexes (1‐6) have been characterized by Single crystal XRD measurement. Elemental analysis, EPR, IR and UV/Vis spectra have been recorded to further characterise these complexes. The direct current (dc) and alternating current (ac) magnetic susceptibility measurements has been carried out to study magnetic properties of the complexes. Thermogravimetric analysis (TGA) has also been done to assess thermal stability of the complexes.
In‐Situ Synthesis of Tetraphenylporphyrin/Tungsten (VI) Oxide/Reduced Graphene Oxide (TPP/WO3/RGO) Nanocomposite for Visible Light Photocatalytic Degradation of Acid Blue 25
Authors: Malefane Mope E. , Ntsendwana Bulelwa , Mafa Potlako J. , Mabuba Nonhlangabezo , Feleni Usisipho , Kuvarega Alex T. 
Published: August 2019

AbstractEnvironmental pollution is regarded as a major concern and photocatalysis has been used successfully to combat discharges of recalcitrant pollutants. In this study, meso tetraphenylporphyrin (TPP), tungsten (VI) oxide and reduced graphene oxide nanocomposite materials were prepared by in situ method and calcined at different temperatures. The catalysts impact was evaluated for the degradation of acid blue 25 (AB25) under visible light irradiation. The as‐prepared composite materials were characterised for morphological and crystalline structural properties using SEM, Raman, FTIR, TGA, BET and XRD techniques. UV‐Vis and PL absorption studies obtained a band gap energy of 2.14 eV which showed its ability to absorb light in the visible region. The nanocomposite exhibited spherically shaped particles of monoclinic WO3 when using 20 mg TPP and calcination temperature of 350 °C for 4 hours. The highest degradation efficiency of 85% on 20 ppm AB25 as per UV/Vis and TOC results, was obtained for the photocatalyst calcined at 350 °C for 4 hours. The high degradation efficiency can be ascribed to the visible light absorbing nature of the composite and high separation rate of photogenerated charge carriers. This nanocomposite can be a suitable candidate for treatment of other dyestuff in textile effluents.
New Electrochemical Approach for the Synthesis of Pd‐PdO/C Electrocatalyst and Application to Formic Acid Electrooxidation
Authors: Kuriganova Alexandra B. , Faddeev Nikita A. , Leontyev Igor N. , Allix Mathieu , Rakhmatullin Aydar , Smirnova Nina V. 
Published: August 2019

AbstractPd‐PdO/C catalyst for formic acid electrooxidation has been synthesized via electrochemical dispersion of Pd foil electrodes under pulse alternating current conditions in NaCl aqueous electrolyte. About 35 wt% of the as‐prepared Pd‐PdO/C specimen is PdO as revealed by X‐ray diffraction. The microstructural characteristics and catalytic activity of the synthesized Pd/C catalyst have been compared with those of a Pt/C catalyst prepared under the same conditions. Pd nanoparticles of Pd‐PdO/C catalyst exhibit smaller average dimensions and narrower particle size distribution – 7.4±0.5 nm and 1.9±0.5 respectively for Pd and PdO particles. The process of ethanol electrooxidation on the catalyst was characterized by high overvoltage (up to 800 mV). The overvoltage of the formic acid electrochemical oxidation on Pd/C is 590 mV less than on Pt/C.
Annelated Aminoimidazoles in Synthesis of Imidazo[4,5‐b]pyridines
Authors: Shvydenko Tetiana , Nazarenko Kostiantyn , Shvydenko Kostiantyn , Rusanov Eduard , Tolmachev Andrei , Kostyuk Aleksandr 
Published: August 2019

AbstractA convenient method for the synthesis of annelated imidazo[4,5‐b]pyridines was developed. The method is based on condensation of previously unavailable aminoimidazoles with 1,3‐dicarbonyl compounds. Aminoimidazoles 3 were prepared and some their properties were studied. The method gives the target imidazopyridines in good yields and allow varying substituents. A set of imidazopyridines was prepared. As an example, the imidazopyridines featuring carboxylic acids and esters were synthesized. Their structure was unambiguously determined by multinuclear NMR spectroscopy and the molecular structure of imidazopyridine 15 a was determined by single‐crystal X‐Ray diffraction.
Synthesis of Magnetically Separable Nanocatalyst CoFe2O4@SiO2@MIL‐53(Fe) for Highly Efficient and Selective Oxidation of Alcohols and Benzylic Compounds with Hydrogen Peroxide
Authors: Tan Jin , Liu Xiao Bing , Chen Wei Feng , Hu Yu Lin 
Published: August 2019

AbstractA new methodology for the highly efficient and atom‐economic oxidation of alcohols and benzylic compounds to the corresponding aldehydes and ketones with environmental‐friendly hydrogen peroxide using a magnetic MOF nanocatalyst has been developed. We demonstrated that the resulting magnetic nanocomposite CoFe2O4@SiO2@MIL‐53(Fe) can show excellent catalytic performances in the highly selective oxidation at room temperature, based on a synergetic effect between iron sites and CoFe2O4@SiO2. The nanocatalyst offers simple operation for recovery and the recycling test showed that it could be reused for successive runs without significant degradation in catalytic activity.