Search

In this study, the "milky disease" model of Eriocheir sinhensis was constructed via intramuscular injection with the pathogenic yeast Metschnikowia bicuspidata. The dynamic pathological changes of E. sinensis after injection were elucidated with two staining methods (haemotoxylin‐eosin and alcian blue periodic acid‐Schiff) and fluorescence in situ hybridization technology. Anatomical observation revealed three stages of the "milky disease": no clinical signs (1–4 days after infection), the appearance of signs of disease (5–7 days), and significant liquefaction (10 days). Histological observation also revealed three stages of the disease: yeast diffusion (1–2 days after infection), yeast slow development (3–4 days), and yeast rapid proliferation (5 days). And FISH technique was suitable for the early detection of infection with M. bicuspidata in E. sinensis. We found that M. bicuspidata spread to the whole body of the crab through the haemolymph and developed into fungal septicaemia. These results elucidate the systemic pathological characteristics of "milky disease" in E. sinensis and suggest the pathogenic mechanism of M. bicuspidata. [ABSTRACT FROM AUTHOR]

Water resources are scarce, and secondary soil salinization is severe in the Hetao Irrigation District. Farmland shelterbelt systems (FSS) play a critical role in regulating soil water and salt dynamics within the irrigation district. However, the understanding of soil water and salt migration within FSS during the freeze–thaw period remains unclear due to the complex and multifaceted interactions between water and salt. This study focused on a typical FSS and conducted comprehensive monitoring of soil moisture, salinity, temperature, and meteorological parameters during the freeze–thaw period. The results revealed consistent trends in air temperature and soil temperature overall. Soil freezing durations exceeded thawing durations, and both decreased with an increasing soil depth. At the three critical freeze–thaw nodes, the soil moisture content at a 0–20 cm depth was significantly lower than at a 40–100 cm depth (p < 0.05). The soil water content increased with time and depth at varying distances from the shelterbelt, with an average increase of 7.63% after freezing and thawing. The surface water content at the forest edge (0.3H, 4H) was lower than inside the farmland (1H, 2H, 3H). Soil salt accumulation occurred during both freezing stable periods and melting–thawing periods in the 0–100 cm soil layer near the forest edge (0.3H, 4H), with the highest soil salinity reaching 0.62 g·kg−1. After the freeze–thaw period, the soil salt content in each layer increased by 11.41–47.26% compared to before the freeze–thaw period. Salt accumulation in farmland soil near the shelterbelt was stronger than in the far shelterbelt. The multivariate statistical model demonstrated goodness of fit for soil water and salt as 0.94 and 0.72, respectively, while the BP neural network model showed goodness of fit for soil water and salt as 0.82 and 0.85, respectively. Our results provide an efficient theoretical basis for FSS construction and agricultural water management practices. [ABSTRACT FROM AUTHOR]

In order to prepare fluorescent cellulose acetate fiber with higher fluorescence intensity and stability. N, N-dimethylformamide was used as the solvent, cellulose acetate was used as the raw material, europium-and dysprosium-doped strontium alkaline-earth aluminate were used as the fluorescent molecules, and deionized water were used as the solidification bath, fluorescent cellulose acetate fibers were prepared by wet spinning. The surface morphology, mechanical property, fluorescent particle distribution, and fluorescence property of the fiber prepared at different spinning solution concentrations, fluorescent particle contents and solidification bath temperatures were characterized by using trans reflectance metallurgical microscope, electronic single-fiber compactor, a scanning electron microscope and fluorescence spectrometer. The results showed that the fluorescent fibers produced by wet spinning had breaking strength of 4.2 cN/dtex, breaking elongation of 380% and fluorescence intensity of 4.8x105 when the concentration of spinning solution was 20%, the fluorescent particle mass fraction was 3%, and the solidification bath temperature was 25 °C. [ABSTRACT FROM AUTHOR]