Note ① associations should block the strict separation member embedded. Be sure to carefully check the first community pathology block number (including sub-number) embedded blocks, and physician-embedded surface coverage requirements, Xining biological samples, accurately pack into the corresponding number of pathological strip. Embedded error occurs, biological specimen plant, must immediately drawn physician and head of the Department of Pathology duty to take risk of contact, timely disposal. ② must guard against all kinds of foreign body contamination, do not extraneous associations (including sutures, paper or other foreign matter (especially hard foreign) embedded in paraffin blocks. ③ embedding process to be operated quickly, manufacturer of biological specimens, in order to avoid associations block has not buried properly before melting wax solidifies. ④ embedded with melting wax should be pure, mp affordable. Ⅰ Baptist wax soft wax (melting point of 45 ~ 50 ℃), Baptist wax Ⅱ, Ⅲ and are embedded with a hard wax wax (melting point 56 ~ 58 ℃). ⑤ embedded with melting wax should be left to settle before use and filtered. ⑥ melting wax does not suffer from the use of a flaming fire, burning to prevent the phenomenon embedded with melting wax The temperature should be <65 ℃; embedded with forceps not heated too high, so as not to burn glycogen community show periodic acid Schiff (PAS) reaction: ⑴ principle: Glycogen is an animal polysaccharide, colorless. abundant in the liver and muscle cells cytoplasm .PAS reaction (Periodic acid schiff Reaction) can generate purple substance at the site where glycogen, which will show .RAS reaction of two steps: first, is a strong oxidant periodic acid (Periodic acid, formula HIO4), the CC bond of glycogen in glucose molecule is opened, the CHOH-CHOH oxidation to produce dialdehyde and Schiff reagent colorless magenta sulfite molecule binding to sugar aldehyde generate new composite .HIO4schiff purple purple reagent polysaccharide aldehyde reaction product (oxidation) (reagent preparation and methods are detailed histological techniques monograph) ⑵ result: purple granular glycogen Xining biological specimens | voyage teaching | biological specimen plant provided by the Xinxiang City voyage Teaching Equipment Co., Ltd. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) (www.yuanhang369.com) is a leader in Xinxiang specimen model, over the years, the company has implemented. scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. On the voyage instructional leadership with the staff warmly welcome all inquiries negotiations to create a better future teaching voyage.