Search

Achieving the concurrent manifestation of thermally activated delayed fluorescence (TADF) and aggregation‐induced emission (AIE) within a single molecular system is highly sought after for organic light‐emitting diodes (OLEDs), yet remains rare. In this study, we present a novel TADF‐AIE dye, named PQMO‐PXZ, which has been designed, synthesized, and systematically characterized. Our comprehensive investigation, which includes structural analysis, theoretical calculations, and optical studies, evaluates the potential of PQMO‐PXZ for integration into OLEDs. Unlike existing azaryl‐ketone‐based emitters, PQMO‐PXZ exhibits red‐shifted emission and enhanced luminescence efficiency, due to its rigid structure and strong intramolecular charge transfer characteristics. Significantly, PQMO‐PXZ demonstrates pronounced AIE properties and TADF with a short delayed lifetime. When utilized as the emissive core, OLED devices based on PQMO‐PXZ achieve a respectable external quantum efficiency of up to 11.8 % with minimal efficiency roll‐off, underscoring PQMO‐PXZ's promise as a highly efficient candidate for OLED applications. [ABSTRACT FROM AUTHOR]

Pullulan can not only provide a source of organic carbon but also has excellent properties. However, current research is mostly limited to the physical properties of the high-molecular-weight components of pullulan, and little is known about the application of its low-molecular-weight components. This study was designed to explore the impact of presoaking of radish seeds in a pullulan solution on seed germination and subsequent seedling growth under salt stress conditions. Pullulan soaking was found to enhance the germination rates of radish seeds subjected to salt stress, while also enhancing the aboveground growth of radish seedlings. Pullulan soaking resulted in increases in chlorophyll, soluble protein, and soluble sugar concentrations in the leaves of these seedlings, together with greater peroxidase activity and root activity as well as decreases in Na+ and malondialdehyde concentrations. This provides an important reference for the application of pullulan in plant protection. [ABSTRACT FROM AUTHOR]

This study addresses the production enhancement of pullulan, an extracellular polysaccharide with various applications. Pullulan is primarily produced by Aureobasidium pullulans (A. pullulans), and genetic modification is commonly used to increase its yield. However, there is a need for a more efficient and safer method. To achieve this, we designed a high-throughput screening system utilizing a unique fluorescent protein specific to pullulan. Ultraviolet (UV) mutagenesis was applied to create a pool of mutant strains, and flow cytometry allowed for single-cell screening. Our approach yielded strain M1-B3, which exhibited a substantial increase in pullulan production from 26.5 g/L to 76.88 g/L. Additionally, the molecular weight of the produced pullulan significantly increased, expanding its potential commercial application. This study demonstrates an efficient and safe method to enhance pullulan production in A. pullulans. The UV mutagenesis and flow cytometry based on screening not only increased yield but also improved pullulan's molecular weight. The adaptability of this method to other polysaccharides and its potential for genomic analysis and broader applications make it a valuable tool in bioproduction. [ABSTRACT FROM AUTHOR]

Metal organic framework (MOF) materials have attracted extensive attention due to their adjustable pore structure, high specific surface area, easy modification and strong catalytic activity. Organosilicon materials are widely used in sealing, bonding, lubrication, coating, surface modification and other fields due to their advantages of high-low temperature resistance, hydrophobicity, and flame retardance. MOF/ organosilicon composites have become a research hotspot due to their excellent characteristics. This paper reviewed the progress of MOF/ organosilicon composites, introduced MOF materials in catalytic hydrosilylation and properties improvement of silicone rubber, as well as the application of silicone in the synthesis and modification of MOF. The future trend of MOF materials in the application of silicone rubber was also predicted. [ABSTRACT FROM AUTHOR]

DTQ silicone resin was prepared by hydrolysis polycondensation of dimethyl dimethoxy siliane, methyl trimethoxysilane, tetraethyl orthosilicate, and then it was added to two-component room temperature vulcanized (RTV-2) silicone rubber. The effects of DTQ silicone resin dosage, T chain segment content, Q chain segment content, and alkoxy hydrolysis degree on the performance of RTV-2 silicone rubber were studied. The results show that DTQ silicone resin exhibited a large amount of active hydroxyl groups. After adding RTV-2 silicone rubber, it could react with 107 silicone rubber under the catalyst, increase the molecular weight of polydimethylsiloxane and increase the branched chain structure, thereby improving the elongation at break of RTV-2 silicone rubber. The condition for preparing DTQ silicone resin was when the ratio of dimethyl dimethoxy silane, methyl trimethoxysilane and tetraethyl orthosilicate was at 1:0. 2:0. 2, and the water added was at 50% of the alkoxy substance in the system; The optimal DTQ silicone resin amount was 6%, and the elongation at break of RTV-2 silicone rubber was 338%, thus the RTV-2 silicone rubber possessed a tensile strength of 0. 97 MPa, and a breaking time of more than 30 minutes. [ABSTRACT FROM AUTHOR]

Aminopropyl silicate was made from 3-aminopropyl triethoxysilane and used for powder surface treatment to produce modified zinc borate. The silicone sealant was made with α,ω-dihydroxy polydimethylsiloxane as the base polymer, active nano-calcium carbonate as the reinforcing filler, along with the flame retardant, crosslinker, adhesive additive, catalyst, etc. The effects of aminopropyl octyl silicone on the surface properties of zinc borate and the flame retardant system on the flame retardant and mechanical properties of silicone sealant were studied. The results showed that the modified aminopropyl silicate showed an elevated activation grade of zinc borate, lowered oil absorption and better dispersion in the organic polymer system. When the flame retardant system adopted 20 phr of aluminum hydroxide and 20 phr of modified zinc borate, the silicone sealant displayed good comprehensive performance, with vertical combustion grade of FV-0, tensile strength of 1.18 MPa, pull elongation at 478%, extruding rate at 14.8 g/min, and bonding strength at 1.52 MPa. [ABSTRACT FROM AUTHOR]

After the end of the Second World War, Yugoslavia, as one of the victorious countries, received various assistances for its post-war reconstruction from United States, Britain, France and Soviet Union. The Soviets expulsion of Yugoslavs out of Cominform in 1948 signalized the unfolding of the first Soviet-Yugoslav conflict, which led to the subsequent economic blockade of Yugoslavia from Soviet bloc countries. Faced with potential Soviets military invasion and political subversion, as well as worsening domestic economic situation resulted from collectivization and drought, Yugoslavia changed its strategic orientation to the West and turned to United States for help. American thought the tension between Yugoslavia and Soviet bloc would be used to further widen the split within the Soviet bloc, so they actively developed several programs to "keep Tito afloat". This paper examines the evolution of the American efforts to aid Yugoslavia in the early Cold War period. [ABSTRACT FROM AUTHOR]

To investigate the association of DNA polymorphisms in CYP11B2 and CYP11Bl loci with the risk of aldosterone-producing adenoma (APA). Methods We used the real-time PCR TaqMan-MGB probe to detect the single nucleotide polymorphism ( SNP) of CYP11B2 gene rs5301, rs6471570 and CYP11B2 gene rs3802228, rs3802230, rs4545, rs4546, and rs6433 loci in the peripheral blood of 80 patients with APA (APA group) and 101 healthy controls (control group). SNPassoc 1. 9-2 and Haplo stats 2. 17. 0 software were performed to analyse the correlation of the CYP11B2 and CYP11B1 haplotype and genotype with the risk of APA. Results The frequencies of the A allele of rs5301, A allele of rs3802228, and Gallele of rs6433 were higher in the APA group than in the control group (all P < 0. 05). After we adjusted the sex, age and BMI, the frequency of the AG genotype of rs4545 in the APA group was less than that of the control group (P < 0. 05). The haplotype analysis showed that frequencies of GAACAAC and GCGAAGT were lower than those of the control group (OR= 0. 73, 95% CI= 0. 57-0. 93; OR= 0. 81, 95% CI 0. 69-0. 95). Conclusions CYP11B2 and CYP1B1 gene polymorphisms are associated with the risk of APA. The polymorphism rs4545 locus of the CYP11B2 gene is associated with APA population, and APA is negatively correlated with haplotype GAACAAC and GCGAAGT. [ABSTRACT FROM AUTHOR]

This paper examines the geopolitical contradictions between Soviet Union and Yugoslavia during 1946 and 1948. Their strategic orientations split significantly toward the Greek Civil War, the construction of Yugoslav-Bulgarian Federation and Balkan Federation, the Yugoslav-Albanian relation and integration, and the final settlement of Trieste. These irreconcilable geostrategic contradictions and separate divergences of national interests finally led to the first crack within the Socialist Bloc. [ABSTRACT FROM AUTHOR]