Chiral organosilanes are valuable chemical entities in the development of functional organic materials, asymmetric catalysis, and medicinal chemistry. As an important strategy for constructing chiral organosilanes, functionalization Si-CAryl bond typically relies on transition-metal catalysis. Herein, we present efficient method atroposelective synthesis biaryl siloxane atropisomers via organocatalytic Si-C dinaphthosiloles with silanol nucleophiles. The reaction proceeds through protonation...

In this work, a green analytical method was established for the simultaneous extraction and detection of 20 analytes-10 neonicotinoid insecticides their 10 major toxic metabolites in edible herbs. QuEChERS LC-MS/MS were used to analyze analytes five The residues 109 herbal samples detected, which 90 positive, residue total ranged from 0.26 139.28 μg/kg. Acetamiprid (77.06 %, ≤85.95 μg/kg), imidacloprid (67.89 ≤32.49 μg/kg) (N-desmethyl-acetamiprid (44.04 ≤18.42 desnitro (48.62 ≤16.55 most...

Mycotoxin contamination in edible and medicinal plants seeds is a potential toxicological concern for consumers. A novel, green efficient defatting de-pigment clean-up pretreatment was first developed the simultaneous determination of 31 mycotoxins via freeze-out combined with solid-phase extraction. Combination extraction can achieve double effect: depigmenting. The combination two effect. Excellent performance characteristics method validation, inter- intra-day precision (RSD <10%),...

In the context of developing a new era, pharmaceutical supply chain market has gradually transformed from seller's to buyer's market. The closer consumers are, greater pricing power, so power manufacturers and retailers also changed. This study considers effect service on strategy platform chain. aimed coordinate optimization, coordination complementary products is discussed mainly by researching price factors. Various situations are studied hypothesis model solving. uses Stackelberg game...

In this study, we investigated the mediating effects of active procrastination and passive on relationship between academic stress performance. addition, proposed moderating effect self-efficacy procrastination. According to influence performance is mediated by When individuals perceive stress, they will have better if take procrastinate while can produce poor Moreover, when high self-efficacy, it promote our That say, individual aware necessary believe in their own ability action, which...

A growing body of literature suggests that racial/ethnic groups experience pain differently. The current pilot study explored cultural differences in the meaning pain, display rules and coping strategies among four ethnic (i.e., Caucasians, African Americans, Asians, Hispanics). Semi-structured interviews were conducted with a multi-ethnic sample 20 college students (6 African-American, 7 white, 4 Asian, 3 Hispanic) (85% female, 15% male). Cultural emerged how various give to express cope...

The traditional performance evaluation method, which is mainly based on financial indexes, no longer applicable to the current dynamic, complex, and coordinated of service quality fresh agricultural produce supply chains. Comprehensive evaluations regarding coordination-based chain services are now required. Specific analyses index weights, identification potential problems, exploration best solutions, efforts improve situation—regarding circulation products—are also By carrying out this...

The growth of scientific and technological innovation in China is facing a bottleneck under the influence domestic foreign environments. economic internal circulation policy may explore new driving forces for from perspective optimizing efficiency production factor allocation. This research applies provincial data 2001 to 2017 empirically investigate spatial effects market distortions on innovation. DEA (Data envelopment analysis) model with variable returns scale exploited measure function...

Abstract In order to apply grouting material the joints of fabricated buildings and make it meet performance demands low shrinkage, strong bond, high toughness joint materials for prefabricated buildings, expansion agent (EA), neoprene latex (NL), rubber particles (RP) were used modify material, effects different dosages three components on working performance, mechanical properties, or shrinkage properties investigated. The results show that EA decreases flexural strength-to-compressive...

In the context of development new period, pharmaceutical supply chain market is gradually changing from a seller's to buyer's market. The closer consumer, greater market's pricing power, so power manufacturer and retailer has changed, change in output demand increased accordingly. Since uncertain, there are internal external risks. Retailers suppliers can operate coordinate effectively based on their core strengths, improve ability avoid risks repair flexibly that relatively balanced stable....

Bioaccumulation and biotransformation are critical factors that affect the release of easily metabolizable chemicals to cause human toxicity. The glucoside-type modified mycotoxin Zearalenone-14-Glucoside (Z14G) has attracted global attention for its high occurrence in foodstuffs potential threat humans as rate transformation into parent forms. Given limited toxicokinetics information, this study assessed absorption, distribution, excretion Z14G, aiming define risk Z14G. Z14G were after...