Regarding biosafety issues of genetically modified organisms, China and the international community should strictly abide by the Cartagena Protocol on Biosafety [i] and use the precautionary principle to deal with risks to the environment and human health caused by genetically modified organisms. This principle is also adopted in other countries, regions and international laws as an important means to protect the environment and human health, and has become the legal basis for the international supervision of genetically modified organisms. The precautionary principle states that the lack of scientific knowledge or scientific consensus should not necessarily be interpreted as indicating that there is a degree of risk, no risk, or an acceptable risk. Regarding the use of antibiotic resistance genes in GM foods, the international community, including scientific institutions, will use the following regulations as a precautionary principle. In 2003, Article 58 of the Guidelines for the Risk Assessment of Genetically Modified Plant Foods jointly issued by the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO) stated: "Antibiotic resistance genes that are resistant to clinically applied antibiotics should not be "[ii] appears in food. The EU decided to ban the use of antibiotic-resistant markers from 2004 [iii]. In 2007, the World Health Organization (WHO) classified kanamycin, neomycin, and tetracycline as the second class according to the importance of drugs. It is an important class of antibiotics [iv], which means kanamycin resistance gene, tetracycline Antibiotic resistance genes such as resistance genes should not appear in foods. The European Medicines Agency (EMEA) agreed with the World Health Organization (WHO) that kanamycin should be classified as a medically important drug [v]. Therefore, Greenpeace also recommended that relevant government departments strictly abide by the Cartagena Protocol on Biosafety and deal with the risks of genetically modified organisms to the environment and human health with the precautionary principle; immediately evaluate the genetically modified papaya containing antibiotic resistance genes for consumption. Health hazards; further improvement of the safety assessment system for genetically modified organisms; the use of antibiotic resistance genes as marker genes in transgenic studies is strictly prohibited.
The retaining ring, also known as the clip spring, is divided into the hole with the retaining ring and the shaft with the retaining ring, from the role of axial limit, can prevent other parts from axial movement. The forming technology mostly uses the sheet metal punching, the function section presents the taper, after the assembly is mostly [The linear contact"part big size model uses the wire material winding forming, punching cuts the surplus material the craft to make, the section presents the regular rectangle, after the assembly is [The surface contact".
Circlip for Shaft/hole circlip for holes circlip for Shaft/hole circlip for Holes Applied Science Mechanical Engineering Machinery Parts Definition of ring-shaped machine parts which are fixed on shaft/hole
A separable substantially flat washer with an inner or outer portion used as an outer ring or inner ring rib for radial cylindrical roller bearings. BEVELLED RING: A separable ring with an [L"shaped section, the outer part of which acts as an inner rib of a radial roller ball bearing. Middle Ring: A separable ring in two-or more-row roller bearings, used to separate and guide the rollers in each row. The RIB is a narrow shoulder that is parallel to the rolling direction and protrudes from the raceway surface to support and guide the roller and keep it in the bearing. The types of retaining rings are: Taper Pin Locking Ring, screw locking ring, screw locking ring with locking ring, wire retaining ring, hole elastic retaining ring-a type, hole elastic retaining ring-b type, shaft elastic retaining ring-a type, shaft elastic retaining ring-b type, screw tightening shaft end retaining ring, Bolt tightening shaft end retaining ring, hole with Steel Wire retaining ring, shaft with steel wire retaining ring, etc. . Application Discipline Mechanical Engineering (First-level Discipline) ; Mechanical Parts (second-level discipline) ; fasteners (third-level discipline) use the fixed shaft parts are divided into axial fixed and circumferential fixed. Axial fixation methods are: Shaft Shoulder or shaft ring fixed, with the shaft end ring or cone surface fixed, fixed with the shaft sleeve, fixed with a round nut, fixed with elastic retaining ring. The retaining ring mainly plays the role of axial fixation, in which the cone plus retaining ring fixation has a higher degree of centering. The retaining ring of the rolling bearing is equivalent to a movable retaining edge, which is used to block the rollers for easy installation. The structure of the retaining ring comprises a flat retaining ring, an oblique retaining ring and a middle retaining ring.
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