Co-application of polyethylene oxide (PEO), biochar, and seaweed fertilizer improves desert soil properties.

Improving water retention, erosion resistance and nutrients in desert areas is essential for ecological sustainability. This study evaluated the effects of biochar, polyethylene oxide (PEO), and seaweed fertilizer on the properties of desert sandy soil, focusing on water retention, erosion resistance, and soil nutrients. The sandy soil used in the study was taken from the Tengger Desert in Gansu, China, and an orthogonal experimental design was used to select three different proportions of biochar, PEO, and seaweed fertilizer.

[Application of heart rate variability in evaluation of mental workload].

Objective: To investigate if heart rate variability (HRV) can be used to evaluate mental workload.

Methods: Forty-six volunteers were selected to simulate mental work by inputting the random number through keyboards. ECG was recorded by Holter 8800 during the performance and transferred into digital signal.

[Estimation of intramuscular load of the upper limb in static postures and repetitive work by surface electromyography].

Objective: To evaluate the intramuscular loads of the upper limb during static postures and repetitive work by surface electromyography.

Methods: Twenty-six male college student volunteers were recruited for the experiment. The surface electromyography (SEMG) singal were recorded from the brachioradialis, biceps brachii, deltoid and trapezius of right arm during static postures including forward elevating, abducting, extending and a repetitive performance at different height of the bench, and root mean square (RMS) values were educed from the singal.

[Analysis of surface electromyography on repetitive lifting task-induced fatigue of back muscles].

Objective: Using surface electromyography (SEMG) technique to evaluate repetitive lifting task-induced fatigue of back muscles.

Methods: Thirteen volunteers lifted and lowered an 8 kg weight from floor to waist level for 100 times. Fatigue in the erector spinae muscles was quantified by comparing the frequency content of the EMG signal during static contractions performed before, and immediately after the 100 lifts.

[Expression of Smads in lung tissue of quartz-induced pulmonary fibrosis in mice].

Objective: To observe Smads protein expression in lung tissue of quartz exposed mice and to explore its association with pulmonary fibrosis in silicosis.

Methods: The experimental mice were divided into control and quartz groups. 0.

[RT-PCR method for detecting the expression of transforming growth factor-beta1 gene in lung tissues of silica-treated mice].

Objective: To investigate the gene expression of transforming growth factor-beta(1) (TGF-beta(1)) in lung tissues of silica-treated mice.

Methods: The experimental mice were divided into control and silica group. 0.

[Immunohistochemical method for the detecting expression of transforming growth factor-beta1 in lung tissues of silica-treated mice].

Objective: To investigate the protein expression of transforming growth factor-beta(1) (TGF-beta(1)) in lung tissues of silica-treated mice.

Methods: The experimental mice were divided into control and silica groups. 0.