Study objectives: To describe the current status and some factors related to hearing loss among the Armored Army soldiers in 2017; to evaluate the effectiveness of Mg-B6 supplementation in preventing hearing loss among the soldiers of Armored Tank Army in 2018.

Objects of research: The research objective of the thesis is to determine the species composition, distribution and current status of scorpion species in the North Central region, Viet Nam to contribute and create a scientific basis for exploitation, use and development these species in an effective, safe and sustainable way.

The research objective of the thesis is to determine the species composition, distribution and current status of scorpion species in the North Central region, Viet Nam to contribute and create a scientific basis for exploitation, use and development these species in an effective, safe and sustainable way.

The general objectives of the study are to evaluate the status and to find out scientific basis to develop freshwater prawn culture in brackish water, in order to diversify culture systems and species, to stabilize social-economics for inhabitants, and to adapt to the issues of sea level rise and saltwater intrusion in Mekong Delta.