Prepare specimens commonly used preservative fixed drug, what the advantages and disadvantages? Formaldehyde: aka ants aldehyde, is a colorless gas with a strong odor stimulation, soluble in water, its 35 to 40% aqueous solution of a trade name is usually called formalin. Advantages: Formaldehyde easily with protein amino combine to make the protein coagulation, gelatin coagulation, tissue fixation, but also save fat and lipids, permeability strong, shrinkage small, inexpensive to maintain the position of the specimen form and maintain a good skin color, is an excellent, the most widely used preservative fixative. Cons: The fixed tissue stiff brittle, easily pulled off the muscle fibers, inconvenience anatomy operate; there is a strong irritant Hunan plant specimens, eye conjunctiva, respiratory tract and frequent contact with the skin have some damage. Dried plant specimens law transparent adhesive tape method, first select the plant: should choose water containing fewer branches, leaves, flowers, Changsha plant specimens, such as water containing more cactus stems, flowers, which are not easy to dehydration, easy rotten away, so do not choose plants more moisture, and the second is the process shaping, finishing slightly after selecting plants can wipe away the dust on the surface, remove unnecessary offshoot side lobe, if fairly thick branches can The vertical stems cut away part, if it is relatively large flowers, the lower half of the flower can be divided with a scalpel to cut a thin flat herbarium, leaving only a complete front, or you can cut all the flowers, just paste the petals, stamens and other parts of the structure, the last is backing paste Hubei plant specimens, in order to better bring mosaic of colors, can be prepared in accordance with good color mosaic of the corresponding color electro-optical paper, such as safflower do optic backing paper with red, green leaves on the green, were placed in the mosaic of different electro-optical paper, transparent tape with the appropriate width from top to bottom to suppress plant specimens, and electro-optical paper tape must be firmly glued together, and then to have a good pressure scissors flowers, leaves close to the edge of the cut for cut specimens, can be coated with glue on the back of the liner, stick in Taiwan paper label. Hunan plant specimens, plant specimens, teaching voyage by voyage Teaching Equipment Co., Ltd. Xinxiang City. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) strong, credible, in Xinxiang specimen model industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the voyage into the brilliant teaching and you work for a better future!