Abstract: A magnetic bead, and a preparation method therefor and the use thereof in nucleic acid extraction. The preparation method for a magnetic bead comprises: preparing a magnetic core by means of a water-soluble salt of Fe2+ and Fe3+; and subjecting the magnetic core and a silanide to a modification reaction to obtain the magnetic bead, wherein the molar ratio of the addition amount of the used silanide to the total amount of Fe2+ and Fe3+ is greater than or equal to 0.5:1, and the particle size range of the magnetic bead is 0.1-50 ?m.

Abstract: A battery-free electronic blood pressure measuring apparatus comprising a cuff (40), an airbag (22) to push air into the cuff (40), a power generation unit which has a generator (42) and an operating handle (28) coupled with the wall of the airbag (22) to generate electrical power, and a display device (44) to receive electrical power from the power generation unit, detect a blood pressure signal from the cuff (40), generate and display a blood pressure measurement. A method for electronically measuring blood pressure with a battery-free sphygmomanometer comprises pressing an airbag and a generator-driving structure attached to the airbag wall, which leads to electrical power generation and cuff inflation by the airbag at the same time, and measuring the blood pressure with the generated electrical power.

Abstract: A battery-free electronic blood pressure measuring apparatus comprising a cuff (40), an airbag (22) to push air into the cuff (40), a power generation unit which has a generator (42) and an operating handle (28) coupled with the wall of the airbag (22) to generate electrical power, and a display device (44) to receive electrical power from the power generation unit, detect a blood pressure signal from the cuff (40), generate and display a blood pressure measurement. A method for electronically measuring blood pressure with a battery-free sphygmomanometer comprises pressing an airbag and a generator-driving structure attached to the airbag wall, which leads to electrical power generation and cuff inflation by the airbag at the same time, and measuring the blood pressure with the generated electrical power.