Voyage teaching equipment which has accumulated rich experience in production, sales and other areas of biological slice laboratory supplies and equipment, with strong technical strength and strong product development capability. Widely used in agriculture, forestry, animal husbandry, medicine, teacher, research institutions, universities and primary and secondary schools abroad teaching, business involving various types of education. Products: microscopic biopsy specimens, specimens of plants and animals in general, animal and plant specimens soaked organic material embedded specimens (crystal specimens), teaching experimental model (medical model, primary and secondary teaching model), human pathology, embryology, parasitology, medicine signed, microbiology, plant pathology, plant and animal science class microscopic slides, anatomical specimens on display, anatomical specimens plastics, ministries fault specimens, anatomical models Histology and Embryology, vascular cast specimens and other products. Prepare specimens commonly used preservative fixed drug, what the advantages and disadvantages? Alcohol: Ethanol scientific name, the chemical structure of formula CH3CH2OH. Is a colorless liquid, boiling point 78.3 ℃, volatile, accounting for 0.80, can be mixed with carbolic acid, glycerol, any water is a good solvent. Advantages: alcohol with a strong dehydration, can the cell surface and internal moisture removal. So that the molecular structure of the protein release, and protein denaturation and coagulation. This is the alcohol sterilization, conservation organizations, the basic principles of preventing corruption. Alcohol permeability of plant specimens, mixed preservative was added in the organization of alcohol can enhance penetration, shorten corrosion fixed time. Specimens fixed with alcohol, color preserved, not strong irritant, no bad smell. Disadvantages: a high concentration of alcohol, enabling the rapid degeneration of the cell surface protein coagulation, forming a protective film manufacturers of plant specimens, but to stop the drug into the deep play. Therefore, the alcohol concentration of fixed specimens, generally should not exceed 75% (volume percent) 2. Dehydration too herbarium quotes, specimen shrinkage, up to about 20%, and can dissolve fat and lipids. Thus, lipid rich organs such as the brain specimens, do not use alcohol fixative. Another drawback is that it's volatile fast, easy loss. How to make a herbarium, 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!