A method for extracting biological cells on a physical evidence object
A technology of biological cells and extraction methods, which is applied in the field of extraction of biological cells on physical evidence objects, can solve the problems of difficult extraction, low degree of exposure, and high concealment, and achieve the effect of improving the detection rate
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Embodiment 1
[0036] Embodiment 1: the extraction method of biological cell on stone, comprises the steps:
[0037] (1) Use the bioluminescent agent of Suzhou Xiaosong Technology Development Co., Ltd. to visualize the biological traces on the stone. The range of biological traces is less than or equal to 0.5 square centimeters.
[0038] (2) Use the head of the swab soaked in distilled water with a head width of 0.2 mm to 2 mm to rotate and wipe the biological trace position on the stone; the pressure is rotated and the pressure is controlled from heavy to light. The swab is wiped, and the rotation direction of the previous swab is opposite to that of the subsequent swab.
[0039] (3) Wait for step (2) for 5 minutes after the extraction, use fiber diameters of 0.01 mm to 0.05 mm, elastic recovery rate ≥ 80% when elongated 3%, dry fibers with a dielectric constant ≤ 4 at 106 Hz The swab is rotated and wiped again at the biological trace position; the pressure is rotated and the pressure is c...
Embodiment 2
[0042] Embodiment 2: the extraction method of biological cell on the stone, comprises the steps:
[0043] (1) Use the bioluminescent agent of Suzhou Xiaosong Technology Development Co., Ltd. to visualize the biological traces on the stone. The range of biological traces is less than or equal to 0.5 square centimeters.
[0044] (2) Rotate and wipe the biological trace position on the stone with the head of a swab soaked in distilled water with a head width of 0.2-2mm; rotate the pressure and control the pressure from heavy to light. The swab is wiped, and the rotation direction of the previous swab is opposite to that of the subsequent swab.
[0045] (3) Wait for 5 minutes after the extraction in step (2), and wipe with a dry fiber with a fiber diameter of 0.01 mm to 0.05 mm, an elastic recovery rate of ≥80% when elongated at 3%, and a dielectric constant of ≤4 at 106 Hz The swab is rotated and wiped again at the biological trace position; the pressure is rotated and the press...
Embodiment 3
[0060] Embodiment 3: the extraction method of biological cell on brick, comprises the steps:
[0061] (1) The bioluminescent agent of Suzhou Xiaosong Technology Development Co., Ltd. is used to visualize the biological traces on the bricks, and the range of biological traces is greater than 0.5 square centimeters.
[0062] (2) Rotate and wipe the body of the swab soaked in distilled water with a body length of 2-20 mm at the biological trace position on the brick; each swab only rotates once, and three swabs are used for the biological trace position Swabs are made with the previous swab rotating in the opposite direction to the latter swab.
[0063] (3) Wait for 5 minutes after the extraction in step (2), and use a dry fiber wipe with a fiber diameter of 0.01mm-0.05mm, an elastic recovery rate of ≥80% when elongated at 3%, and a dielectric constant of ≤4 at 106 Hz The swab is rotated and wiped again at the biological trace position; each swab only rotates once, and the biolo...
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