Charge controlled immobilization of chloroperoxidase on both inner/outer wall of NHT: Improved stability and catalytic performance in the degradation of pesticide

Cyclodextrins (CDs) are a group of cyclic oligosaccharides produced from starch or starch derivatives. They contain six (αCD), seven (βCD), eight (γCD), or more glucopyranose monomers linked via α-1,4-glycosidic bonds. CDs have a truncated cone shape with a hydrophilic outer wall and a less hydrophilic inner wall, the latter forming a more apolar internal cavity. Because of this special architecture, CDs are soluble in water and can simultaneously host lipophilic guest molecules. The major advantage of inclusion into CDs is increased aqueous solubility of such lipophilic substances. Accordingly, we present studies where the complexation of natural compounds such as propolis and dietary plant bioactives (e.g., tocotrienol, pentacyclic triterpenoids, curcumin) with γCD resulted in improved stability, bioavailability, and bioactivity in various laboratory model organisms and in humans. We also address safety aspects that may arise from increased bioavailability of plant extracts or natural compounds owing to CD complexation. When orally administered, α- and βCD—which are inert to intestinal digestion—are fermented by the human intestinal flora, while γCD is almost completely degraded to glucose units by α-amylase. Hence, recent reports indicate that empty γCD supplementation exhibits metabolic activity on its own, which may provide opportunities for new applications.

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Confining Pt nanoparticles in porous carbon structures for achieving durable electrochemical performance

Nanoscale ◽

10.1039/c4nr03555k ◽

2014 ◽

Vol 6 (20) ◽

pp. 11863-11870 ◽

Cited By ~ 17

Author(s):

C. Yang ◽

M. Zhou ◽

Q. Xu

Keyword(s):

Electrochemical Performance ◽

Porous Carbon ◽

Pt Nanoparticles ◽

Catalytic Performance ◽

Carbon Structure ◽

Carbon Structures ◽

Improved Stability

Uniformly confining Pt nanoparticles in porous carbon structure can give rise to remarkably improved stability and long-term catalytic performance for carbon-supported Pt electrocatalsyts.

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Dual template-directed synthesis of SAPO-34 nanosheet assemblies with improved stability in the methanol to olefins reaction

Journal of Materials Chemistry A ◽

10.1039/c4ta06124a ◽

2015 ◽

Vol 3 (10) ◽

pp. 5608-5616 ◽

Cited By ~ 93

Author(s):

Chan Wang ◽

Miao Yang ◽

Peng Tian ◽

Shutao Xu ◽

Yue Yang ◽

...

Keyword(s):

Catalytic Performance ◽

Mto Reaction ◽

Directed Synthesis ◽

Improved Stability ◽

Excellent Catalytic Performance

Hierarchical SAPO-34 catalysts with different morphologies were synthesized by using dual template [3-(trimethoxysilyl)propyl]octadecyldimethylammonium chloride and diethylamine. Because of its optimal porosity and acidity, hierarchical SAPO-34 exhibited excellent catalytic performance in the MTO reaction.

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A highly efficient atomically-thin curved PdIr bimetallene electrocatalyst

National Science Review ◽

10.1093/nsr/nwab019 ◽

2021 ◽

Author(s):

Fan Lv ◽

Bolong Huang ◽

Jianrui Feng ◽

Weiyu Zhang ◽

Kai Wang ◽

...

Keyword(s):

Active Regions ◽

Formic Acid Oxidation ◽

Catalytic Performance ◽

Surface Strain ◽

Acid Oxidation ◽

Strain Effect ◽

Grand Challenge ◽

Tangential Strain ◽

Surface Electronic Structure ◽

Improved Stability

Abstract The multi-metallene with an ultrahigh surface area has a great potential in precise tuning of surface heterogeneous d-electronic correlation by surface strain effect for the distinctive surface electronic structure, which is a brand new class of promising 2D electrocatalyst for sustainable energy device application. However, achieving such atomically thin multi-metallene still confronts a grand challenge. Herein, we present a new synthetic method for an atomic-level palladium-iridium (PdIr) bimetallene with an average thickness of only ∼1.0 nm for achieving superior catalysis for hydrogen evolution reaction (HER) and formic acid oxidation reaction (FAOR). The curved PdIr bimetallene presents a top-ranked high electrochemical active area of 127.5 ± 10.8 m2 gPd+Ir−1 in the reported noble alloy materials, and exhibits a very low overpotential, ultrahigh activity and improved stability for HER and FAOR. DFT calculation reveals the PdIr bimetallene herein has the unique lattice tangential strain, which can induce the surface distortion with concurrently creating a variety of concave-convex featured micro-active-region formed by variously coordinated Pd-sites-agglomeration. Such strong strain effect correlates the abnormal on-site active 4d10-t2g-orbital Coulomb correlation potential and directly elevates orbital-electronegativity exposing within these active regions, resulting in preeminent barrier-free energetic path for significant enhancement of FAOR and HER catalytic performance.

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Architecture of Radiolitid Rudist (Mollusca) Shell-Wall Structures and its Phylogenetic Implications

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100117054 ◽

1975 ◽

Vol 33 ◽

pp. 686-687

Author(s):

David H. Sturm ◽

Bob F. Perkins

Keyword(s):

Phylogenetic Relationships ◽

Outer Wall ◽

Shell Microstructure ◽

Shell Wall ◽

Wall Structures ◽

Phylogenetic Implications ◽

Cellular Wall ◽

Superfamily Analysis ◽

Central Texas

Each of the seven families of rudists (Mollusca, Bivalvia, Hippuritacea) is characterized by distinctive shell-wall architectures which reflect phylogenetic relationships within the superfamily. Analysis of the complex, calcareous, cellular wall of the attached valve of the radiolite rudist Eoradiolites davidsoni (Hill) from the Comanche Cretaceous of Central Texas indicates that its wall architecture is an elaboration of the simpler monopleurid rudist wall and supports possible radiolite-monopleurid relationships.Several well-preserved specimens of E. davidsoni were sectioned, polished, etched, and carbon and gold coated for SEM examination. Maximum shell microstructure detail was displayed by etching with a 0.7% HC1 solution from 80 to 100 seconds.The shell of E. davidsoni comprises a large, thick-walled, conical, attached valve (AV) and a small, very thin, operculate, free valve (FV) (Fig. 1a). The AV shell is two-layered with a thin inner wall, in which original structures are usually obliterated by recrystallization, and a thick, cellular, outer wall.

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The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

Catalysis Science & Technology ◽

10.1039/c8cy02291g ◽

2019 ◽

Vol 9 (3) ◽

pp. 811-821 ◽

Cited By ~ 7

Author(s):

Zhao-Meng Wang ◽

Li-Juan Liu ◽

Bo Xiang ◽

Yue Wang ◽

Ya-Jing Lyu ◽

...

Keyword(s):

Catalytic Activity ◽

Active Sites ◽

Aerobic Oxidation ◽

Catalytic Performance ◽

Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

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Optimizing electron density of nickel sulfide electrocatalysts through sulfur vacancy engineering for alkaline hydrogen evolution

Journal of Materials Chemistry A ◽

10.1039/d0ta05594h ◽

2020 ◽

Vol 8 (35) ◽

pp. 18207-18214

Author(s):

Dongbo Jia ◽

Lili Han ◽

Ying Li ◽

Wenjun He ◽

Caichi Liu ◽

...

Keyword(s):

Hydrogen Evolution ◽

Electron Density ◽

Rational Design ◽

Nickel Sulfide ◽

Catalytic Performance ◽

Sulfide Catalysts ◽

Sulfur Vacancy

A novel, rational design for porous S-vacancy nickel sulfide catalysts with remarkable catalytic performance for alkaline HER.

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Review on the aerodynamics of intermediate compressor duct

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.14.4.2020.13.0587 ◽

2020 ◽

Vol 14 (4) ◽

pp. 7446-7468

Author(s):

Manish Sharma ◽

Beena D. Baloni

Keyword(s):

High Pressure ◽

Pressure Loss ◽

Flow Analysis ◽

Outer Wall ◽

Optimization Techniques ◽

Optimum Pressure ◽

Research Areas ◽

Static Pressure Distribution ◽

High Pressure Compressor ◽

Pressure Compressor

In a turbofan engine, the air is brought from the low to the high-pressure compressor through an intermediate compressor duct. Weight and design space limitations impel to its design as an S-shaped. Despite it, the intermediate duct has to guide the flow carefully to the high-pressure compressor without disturbances and flow separations hence, flow analysis within the duct has been attractive to the researchers ever since its inception. Consequently, a number of researchers and experimentalists from the aerospace industry could not keep themselves away from this research. Further demand for increasing by-pass ratio will change the shape and weight of the duct that uplift encourages them to continue research in this field. Innumerable studies related to S-shaped duct have proven that its performance depends on many factors like curvature, upstream compressor’s vortices, swirl, insertion of struts, geometrical aspects, Mach number and many more. The application of flow control devices, wall shape optimization techniques, and integrated concepts lead a better system performance and shorten the duct length. This review paper is an endeavor to encapsulate all the above aspects and finally, it can be concluded that the intermediate duct is a key component to keep the overall weight and specific fuel consumption low. The shape and curvature of the duct significantly affect the pressure distortion. The wall static pressure distribution along the inner wall significantly higher than that of the outer wall. Duct pressure loss enhances with the aggressive design of duct, incursion of struts, thick inlet boundary layer and higher swirl at the inlet. Thus, one should focus on research areas for better aerodynamic effects of the above parameters which give duct design with optimum pressure loss and non-uniformity within the duct.

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