scholarly journals Dithienylethene metallodendrimers with high photochromic efficiency

2020 ◽  
Author(s):  
Yu-Xuan Wang ◽  
Qi-Feng Zhou ◽  
Lin Xu ◽  
Xiaoxiao He ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Ring Closure ◽  
Photochromic Property ◽  
High Conversion ◽  
Conversion Yield ◽  
Design And Synthesis ◽  
New Family ◽  
High Conversion Yield ◽  
The Individual

Abstract It has been extremely challenging to achieve multi-photochromic systems with-out affecting the individual photoswitching properties of the constituent units. Herein, we present the design and synthesis of a new family of platinum-acetylide dendrimers containing up to twenty-one photochromic dithienylethene (DTE) units that exhibit both high photochromic efficiency and individual switch-ing properties. Upon irradiation with ultraviolet (UV) and visible (Vis) light, the resultant metallodendrimers display high conversion yield and excellent fatigue resistance. More interestingly, cyclization-cycloreversion kinetics revealed that the photochromic property of each DTE unit in these metallodendrimers is unaf-fected by its neighbor and the full ring-closure of up to twenty-one DTE units in one single dendrimer has been achieved.

Scandium(iii) triflate-promoted serine/threonine-selective peptide bond cleavage

2017 ◽  
Vol 53 (23) ◽  
pp. 3311-3314 ◽  
Author(s):  
Jizhi Ni ◽  
Youhei Sohma ◽  
Motomu Kanai
Keyword(s):  
Bond Cleavage ◽  
Peptide Bond ◽  
High Conversion ◽  
Selective Hydrolysis ◽  
Conversion Yield ◽  
Peptide Bonds ◽  
Peptide Bond Cleavage ◽  
High Conversion Yield ◽  
Site Selective ◽  
Hydrolysis Of

The site-selective hydrolysis of peptide bonds at Ser and Thr positions was promoted by scandium(iii) triflate with a high conversion yield.

Scalable and Cost-Effective Preparation of Hierarchical Porous Silicon with a High Conversion Yield for Superior Lithium-Ion Storage

2016 ◽  
Vol 4 (5) ◽  
pp. 593-599 ◽  
Author(s):  
Xiaolin Liu ◽  
Rongrong Miao ◽  
Jun Yang ◽  
Jinzuan Wang ◽  
Yitian Bie ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Lithium Ion ◽  
Cost Effective ◽  
High Conversion ◽  
Conversion Yield ◽  
Hierarchical Porous ◽  
Ion Storage ◽  
High Conversion Yield

scholarly journals Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1061 ◽  
Author(s):  
Thi Thu Le ◽  
Claudio Pistidda ◽  
Julián Puszkiel ◽  
Chiara Milanese ◽  
Sebastiano Garroni ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Mechanical Milling ◽  
Argon Atmosphere ◽  
High Conversion ◽  
Efficient Synthesis ◽  
Conversion Yield ◽  
Lithium Borohydride ◽  
Molar Ratios ◽  
Milling Parameters ◽  
High Conversion Yield

Lithium borohydride (LiBH4) and sodium borohydride (NaBH4) were synthesized via mechanical milling of LiBO2, and NaBO2 with Mg–Al-based waste under controlled gaseous atmosphere conditions. Following this approach, the results herein presented indicate that LiBH4 and NaBH4 can be formed with a high conversion yield starting from the anhydrous borates under 70 bar H2. Interestingly, NaBH4 can also be obtained with a high conversion yield by milling NaBO2·4H2O and Mg–Al-based waste under an argon atmosphere. Under optimized molar ratios of the starting materials and milling parameters, NaBH4 and LiBH4 were obtained with conversion ratios higher than 99.5%. Based on the collected experimental results, the influence of the milling energy and the correlation with the final yields were also discussed.

Synthesis, properties and application in polyvinyl butyral of spirooxazine photochromic compounds

2019 ◽  
Vol 48 (5) ◽  
pp. 421-430 ◽  
Author(s):  
Liemei Yuan ◽  
Gang Cai ◽  
Jun Gao
Keyword(s):  
Thermal Stability ◽  
Fatigue Resistance ◽  
Polyvinyl Butyral ◽  
Ring Closure ◽  
Content Type ◽  
Safety Glass ◽  
Synthesis Properties ◽  
Covalently Linked ◽  
Fading Rate ◽  
Photochromic Materials

Purpose The purpose of this paper is to evaluate the effect of antioxidant 2,6-di-tert-butyl-p-methylphenol (BHT) on the thermal stability and fatigue resistance of spirooxazine and then study the properties of photochromic polyvinyl butyral resin (PVB) films. Design/methodology/approach BHT was introduced into the spirooxazine system by blending and covalent bonding. The properties of spirooxazine solutions and photochromic PVB films were studied. Findings The thermal stability and fatigue resistance of spirooxazine covalently linked (BHT-SO) or mixed (BHT/SO) with BHT were higher than the system without BHT, and BHT-SO was the better one. But acidic substance would greatly impair the fatigue resistance of spirooxazine. The optimum addition amount of BHT-SO2 to PVB was 2.5 per cent, and the minimum limit was 0.01 per cent. The fading kinetic and fatigue resistance of film were similar to the solution and better. Plasticizer could accelerate the fading rate and strengthen the mechanical properties of photochromic film but had no effect on the fatigue resistance. Research limitations/implications Spirooxazine could be grafted onto the PVB chain to make the ring closure fading reaction slower. Practical implications In addition to the wide application prospects of photochromic materials in decoration, optical storage, etc., the photochromic PVB film in the car safety glass can absorb sunlight and turn blue, then fade to colorless when the sunlight disappears, making the interior environment more comfortable. Originality/value The introduction of BHT into the spirooxazine system not only exerts its ability to capture free radicals, but its bulky volume also increases the resistance of the ring closure, making the fading process slower.

scholarly journals Spironaphthoxazine switchable dyes for biological imaging

2018 ◽  
Vol 9 (11) ◽  
pp. 3029-3040 ◽  
Author(s):  
Yaoyao Xiong ◽  
Andreas Vargas Jentzsch ◽  
Johannes W. M. Osterrieth ◽  
Erdinc Sezgin ◽  
Igor V. Sazanovich ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Living Cells ◽  
Biological Imaging ◽  
High Conversion

We demonstrate that a photochromic spironaphthoxazine switch operates with excellent fatigue resistance and high conversion when irradiated at 405/561 nm in a range of media including living cells.

scholarly journals Novel Lectin-Like Bacteriocins of Biocontrol Strain Pseudomonas fluorescens Pf-5

2005 ◽  
Vol 71 (9) ◽  
pp. 5197-5207 ◽  
Author(s):  
Annabel H. A. Parret ◽  
Koen Temmerman ◽  
René De Mot
Keyword(s):  
Pseudomonas Fluorescens ◽  
Recombinant Proteins ◽  
Bacteriocin Activity ◽  
Antimicrobial Spectrum ◽  
Pseudomonas Tolaasii ◽  
New Family ◽  
Mannose Binding ◽  
The Individual ◽  
Binding Lectin ◽  
Biocontrol Strain

ABSTRACT Bacteriocin LlpA, produced by Pseudomonas sp. strain BW11M1, is a peculiar antibacterial protein due to its homology to mannose-binding lectins mostly found in monocots (A. H. A. Parret, G. Schoofs, P. Proost, and R. De Mot, J. Bacteriol. 185:897-908, 2003). Biocontrol strain Pseudomonas fluorescens Pf-5 contains two llpA-like genes, named llpA1 Pf-5 and llpA2 Pf-5. Recombinant Escherichia coli cells expressing llpA1 Pf-5 or llpA2 Pf-5 acquired bacteriocin activity and secreted a 31-kDa protein cross-reacting with LlpABW11M1 antibodies. Antibacterial activity of the recombinant proteins was evidenced by gel overlay assays. Analysis of the antimicrobial spectrum indicated that LlpA1Pf-5 and LlpA2Pf-5 are able to inhibit P. fluorescens strains, as well as the related mushroom pathogen Pseudomonas tolaasii. LlpA-type bacteriocins are characterized by a domain structure consisting of tandem monocot mannose-binding lectin (MMBL) domains. Molecular phylogeny of these MMBL domains suggests that the individual MMBL domains within an LlpA protein have evolved separately toward a specific, as yet unknown, function or, alternatively, were acquired from different ancestral sources. Our observations are consistent with earlier observations, which hinted that MMBL-like bacteriocins represent a new family of antibacterial proteins, probably with a novel mode of action.

Design and synthesis of new family of ionic liquids based on 2-iminium-1,3-dithiolanes: A combined theoretical and experimental effort

2014 ◽  
Vol 1056-1057 ◽  
pp. 56-62 ◽  
Author(s):  
Azim Ziyaei Halimehjani ◽  
Mehdi Shakourian-Fard ◽  
Marziye Vahdati Farvardin ◽  
Mozhgan Raeesi ◽  
Mohammed Mahmoodi Hashemi ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Design And Synthesis ◽  
New Family ◽  
Experimental Effort

scholarly journals Enrichment of Polyglucosylated Isoflavones from Soybean Isoflavone Aglycones Using Optimized Amylosucrase Transglycosylation

Molecules ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 181 ◽  
Author(s):  
Young Sung Jung ◽  
Ye-Jin Kim ◽  
Aaron Taehwan Kim ◽  
Davin Jang ◽  
Mi-Seon Kim ◽  
...  
Keyword(s):  
Soy Isoflavones ◽  
Reaction Conditions ◽  
Conversion Yield ◽  
Solubility In Water ◽  
Soybean Extract ◽  
Deinococcus Geothermalis ◽  
High Conversion Yield ◽  
Processing And Storage ◽  
And Storage ◽  
Optimal Reaction

Isoflavones in soybeans are well-known phytoestrogens. Soy isoflavones present in conjugated forms are converted to aglycone forms during processing and storage. Isoflavone aglycones (IFAs) of soybeans in human diets have poor solubility in water, resulting in low bioavailability and bioactivity. Enzyme-mediated glycosylation is an efficient and environmentally friendly way to modify the physicochemical properties of soy IFAs. In this study, we determined the optimal reaction conditions for Deinococcus geothermalis amylosucrase-mediated α-1,4 glycosylation of IFA-rich soybean extract to improve the bioaccessibility of IFAs. The conversion yields of soy IFAs were in decreasing order as follows: genistein > daidzein > glycitein. An enzyme quantity of 5 U and donor:acceptor ratios of 1000:1 (glycitein) and 400:1 (daidzein and genistein) resulted in high conversion yield (average 95.7%). These optimal reaction conditions for transglycosylation can be used to obtain transglycosylated IFA-rich functional ingredients from soybeans.

Design and Synthesis of a New Family of Fluorinated Liquid Crystals

2013 ◽  
Vol 19 (7) ◽  
pp. 2370-2383 ◽  
Author(s):  
Valentine G. Nenajdenko ◽  
Aleksey A. Goldberg ◽  
Vasily M. Muzalevskiy ◽  
Elizabeth S. Balenkova ◽  
Aleksey V. Shastin
Keyword(s):  
Liquid Crystals ◽  
Design And Synthesis ◽  
New Family

A four-component domino reaction for the synthesis of novel bridgehead nitrogen-containing pyrido[1,2-d][1,4]diazepines

2021 ◽  
Author(s):  
Rui Wang ◽  
Wei Zhang ◽  
Ying Tang ◽  
Zehui Qi ◽  
Yuanhui Yu ◽  
...  
Keyword(s):  
Ring Closure ◽  
Domino Reaction ◽  
One Pot ◽  
New Family ◽  
Bridgehead Nitrogen

An efficient one-pot four-component reaction for the synthesis of a new family of novel bridgehead nitrogen-containing pyrido[1,2-d][1,4]diazepines has been described and its mechanism has been proposed, which follows a ring-closure...

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