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Currently, there is a lack of data related to the growth and development regulations of male Eriocheir sinensis (E.sinensis) in rice field in northern China, which prevents timely adjustment of the nutritional structure of the feed. This has led to the poor quality of male E.sinensis , which has seriously constrained the cultivation of rice crab. Therefore, the purpose of this experiment was to study the growth, development and nutritional composition of male E.sinensis in rice field. Tissue samples from male E.sinensis were randomly collected on the 0, 15, 31, 46 and 62 days of culture for detection. The results showed that the growth performance of male E.sinensis was faster from 31 to 46 days. The levels of crude protein, crude lipid and EAA in hepatopancreas decreased from 46 to 62 days, whereas gonadal changes were not significant. The PUFA levels of muscle, hepatopancreas and gonad decreased in varying degrees from 46 to 62 days. To sum up, nutrients in hepatopancreas and gonads of male E.sinensis accumulated rapidly from July 15 to August 30. From August 30 to September 15, the nutritional quality of hepatopancreas and gonad of male E.sinensis decreased. • The nutritional components of male crabs from rice fields in northern China were analyzed. • PUFA content in hepatopancreas and gonads was higher from August 15th to August 30th. • EAA content in hepatopancreas was the highest on August 15th. [ABSTRACT FROM AUTHOR]

• The structure combines the advantages of cantilever beam and circular diaphragm. • The structure adopts single sensing element and single inertial mass block. • The sensitivity and lateral anti-interference ability are improved. To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer based on diaphragm-type cantilever is proposed. The theory analysis of the structure was carried out and the finite element model was constructed to simulate and analyze the acceleration sensing characteristic of the sensor. Simultaneously, the tested results of sensing characteristic from the shaking table indicate that the system has excellent response to low-frequency acceleration excitation signal when the natural frequency of the system is 90 Hz. The frequency response range of the system is 5.0–60.0 Hz, in which the acceleration sensitivity is 485.75 pm/g. The acceleration sensor is designed with strong lateral immunity since the sensitivity in the transverse sensitivity is only 3.6% of the sensitivity in the working direction. [ABSTRACT FROM AUTHOR]

Phthalates (PEs), such as di(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP) and butyl benzyl phthalate (BBP) could cause reproductive and developmental toxicities, while human beings are increasingly exposed to them at low-doses. Phytochemical quercetin (Que) is a flavonoid that has estrogenic effect, anti-inflammatory and anti-oxidant effects. This study was conducted to assess the alleviative effect of Que. on male reproductive toxicity induced by the mixture of three commonly used PEs (MPEs) at low-dose in rats, and explore the underlying mechanism. Male rats were treated with MPEs (16 mg/kg/day) and/or Que. (50 mg/kg/d) for 91 days. The results showed that MPEs exposure caused male reproductive injuries, such as decreased serum sex hormones levels, abnormal testicular pathological structure, increased abnormal sperm rate and changed expressions of PIWIL1 and PIWIL2. Furthermore, MPEs also changed the expression of steroidogenic proteins in steroid hormone metabolism, including StAR, CYP11A1, CYP17A1, 17β-HSD, CYP19A1. However, the alterations of these parameters were reversed by Que. MPEs caused male reproductive injuries in rats; Que. inhibited MPEs' male reproductive toxicity, which might relate to the improvement of testosterone biosynthesis. • The study imitated human exposure to the mixture of phthalates (MPEs) at low dose. • MPEs disturbed steroid hormone metabolism and caused male reproductive toxicity. • Phytochemical quercetin inhibited MPEs' male reproductive toxicity in rats. • Quercetin improved the regulation of steroid hormone metabolism. [ABSTRACT FROM AUTHOR]