The study on the early warning period of varicella outbreaks based on logistic differential equation model.

Chickenpox is a common acute and highly contagious disease in childhood; moreover, there is currently no targeted treatment. Carrying out an early warning on chickenpox plays an important role in taking targeted measures in advance as well as preventing the outbreak of the disease. In recent years, the infectious disease dynamic model has been widely used in the research of various infectious diseases.

[Characteristics of main layer and regeneration layer of Haloxylon ammodendron plantations at different ages on the southern edge of the Gurbantunggut Desert, Northwest China].

The population structure characteristics, natural regeneration, and the influential factors of Haloxylon ammodendron plantations at six different stand ages on the southern edge of the Gurbantunggut Desert were studied. The results showed that H. ammodendron plantation at the stand age of 7 could naturally regenerate.

[Effects of high temperature stress on photosynthetic parameters and chlorophyll fluorescence characteristics of Xinjiang hybrid hazels].

With five temperature gradient treatments, this paper studied the effects of high temperature stress on the photosynthetic parameters and chlorophyll fluorescence characteristics of four Xinjiang hybrid hazels. When the temperature gradually raised from 25 degrees C to 45 degrees C, the net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, water use efficiency and light use efficiency of the hybrid hazels decreased gradually, and the decrement was the largest at 35 degrees C - 45 degrees C. The actual photochemical efficiency of photosystem II, electron transport rate, and photochemical quenching coefficient increased slowly with increasing temperature, but decreased sharply when the temperature was raised to >35 degrees C.