Hunan Haili Chemical Industry (China)

IntroductionPrecise matching of nutrient supply with plant demand in tobacco cultivation is crucial for achieving high yield and superior quality. Traditional chemical fertilizer application modes have obvious limitations, and although organic nitrogen substitution has become an important development direction, the determination of optimal substitution ratios and their microbial regulatory mechanisms still require in-depth research.MethodsBased on previous studies, this research established refined organic nitrogen substitution experiments with treatments of 40, 50, and 60% organic nitrogen substitution at two experimental sites, systematically evaluating the effects of different substitution ratios on yield and quality of tobacco, while analyzing differences in soil microbial community composition, function, and network correlations through 16S rRNA sequencing and network analysis.ResultsResults showed that organic nitrogen treatments significantly improved the agronomic traits, yield performance, chemical composition, and sensory quality of tobacco. The underlying microbial community mechanisms revealed that organic nitrogen application significantly enhanced soil microbial community diversity, enriched beneficial bacterial groups (Pseudomonadota, Actinomycetota, Bacteroidota, etc.), strengthened carbon and nitrogen cycling functions, and increased network complexity. Redundancy analysis demonstrated that the microbial communities under organic nitrogen treatments were closely associated with yield and quality traits such as potassium and total sugars. Among all treatments, the 50% organic nitrogen treatment performed optimally, achieving yield increases of 63.4 and 67.8% at two experimental sites respectively, with the best tobacco leaf chemical quality and sensory characteristics. This treatment also exhibited superior performance in microbial community structure and functional coordination, and the study found that 50% is the optimal substitution ratio for microbial response.DiscussionThis study confirmed that 50% organic nitrogen substitution constitutes the optimal fertilization scheme and revealed the underlying microbial response mechanisms by which this ratio optimizes tobacco quality, providing scientific guidance for precision fertilization of tobacco based on microbial theory.

Green and sustainable chemistry principles advocate for the conversion of waste streams (e.g., sugarcane bagasse) into functional materials to mitigate pollution and enable resource circularity.

The rechargeable lithium-sulfur batteries are promising candidate for the energy storage applications due to their low cost and high energy density. However, the lithium-sulfur batteries show poor electrochemical performance, caused by the polysulfide dissolution and low electrical conductivities of the sulfur cathode. Herein, we develop a new strategy to solving these two issues by designing titanium dioxide embed carbon nanofibers/S (CNFs@TO/S) hybrid composites. In this unique hybrid structure, the mesoporous 3D carbon nanofibers could provide fast electron conduction paths and structural stability. The titanium dioxide could act as polysulfide absorber via chemical bond between TiO2 and polysulfide. Owing to these synthetic effect, the as-prepared CNFs@TO/S cathodes exhibit advanced electrochemical performances.

Abstract A series of novel imidazo[4,5-b]pyridine derivatives were synthesized and their structures were characterized by NMR spectroscopy, mass spectrometry and elemental analysis. The results of bioassays showed that some compounds exhibit good fungicidal activity against Puccinia polysora In particular, compound 7b showed an EC50 value of 4.00 mg/L, which was comparable with that of tebuconazole. Besides, preliminary structure-activity relationship was discussed.

A series of novel thiazole acrylonitrile derivatives was designed and synthesized utilizing NC‐510 as a precursor. Their structures were characterized by NMR spectrometry, MS, and elemental analysis. The results of bioassay indicated that some of these title compounds exhibited 100% mortality at 50 mg/L against Aphis fabae. In particular, the compound 11c displayed the best activity: Its LC50 value achieved 1.45 mg/L, and its insecticidal potency is comparable with that of NC‐510.