Metal Biological Enrichment Capacities, Distribution Patterns and Health Risk Implications in a Major Aquacultured Fish Species Worldwide

Seabass (Lateolabrax japonicas) is a major aquacultured fish species worldwide. The bioconcentration, bioaccumulation and biomagnification of metals present in water, sediments and commercial feed were investigated in L. japonicas from an aquaculture pond in the Pearl River Delta (south China). Aluminum (Al), chromium (Cr), manganese (Mn), iron (Fe), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), cadmium (Cd), and lead (Pb) were determined in the dorsal muscle, viscera, backbone, gill and stomach contents of L. japonicas. The gill and stomach contents were found to have higher levels of bioconcentration of most metals than other parts. Based on the bioaccumulation factor, the gill and backbone exhibited the highest accumulation of Zn, while the viscera had the highest capacity to accumulate Cu. The mean biomagnification factor values exceeded for As in dorsal muscle, for Cu in the viscera, for Cr and Pb in the gill, and for Al, Cr, Fe, Cu and Pb in the stomach contents, indicating efficient bioaccumulation from commercial feed and their habitat. Non-metric multidimensional scaling analysis revealed two groups that primarily resulted from the accumulation of metals in various parts of L. japonicas. Moreover, health risk assessment indicated that no notable adverse health effects are likely to occur from the ingestion of L. japonicas as an aquacultured food source.

Clinical Application of High Frequency Ultrasound in Diagnosis and Treatment of Lumbar Muscle Injury After Strenuous Exercise

The purpose of this study was to analyze the clinical application of high-frequency ultrasound in the diagnosis and treatment of lumbar muscle injury after strenuous exercise. In this study, high-frequency ultrasound imaging technology was used to examine the patients' lumbar and dorsal position, and ultrasound examination was performed on the affected side and the healthy side of lumbar dorsal muscle before and after treatment. According to the thickness of abdomen transverse muscle, psoas muscle, lumbar muscle, gluteus medius revealed by ultrasound, as well as the visual analogue scale (VAS) pain score and J0A low back pain score, the rehabilitation of patients was analyzed. Through the observation of ultrasound images, it was found that the thickness of the transverse abdominis, lumbar maximus, quadratus lumborum muscle and gluteus medius on the affected side was significantly improved after treatment, the average VAS pain score was significantly decreased, and the average JOA lower back pain score was significantly increased, indicating that the patient's condition was significantly improved after treatment. The use of high-frequency ultrasound to detect the disease status before and after treatment can accurately understand the course of the disease and the curative effect after treatment. In a word, high-frequency ultrasound has a great clinical effect on patients with lumbar dorsal muscle injury.