Prepare specimens commonly used preservative plant specimens fixed drug education, 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 plant specimens, but also save fat and lipids, highly permeable natural botanical specimens, little shrinkage, low prices, specimen shape and maintain the position to maintain 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, eye conjunctiva, respiratory tract and frequent contact with the skin have some damage. Should pay attention to what the problem of seed plant specimens were collected? For some families and genera have underground stems (such as bulbs, tubers, rhizomes, etc.), such as Liliaceae, Amaryllidaceae, Araceae, etc., in the absence of mining to underground stem of plant specimens difficult to identify preschool, special attention should be collecting underground parts of these plants. Phytoestrogens, dioecious male and female plants and male plants should be collected separately in order to study at identification. Gathering herbs should be taken with all the grass roots. Found basal leaves and stem leaves are not at the same time, pay attention to mining basal leaves. Tall grasses, postharvest be folded under the "V" or "N" shape, and then pressed into samples within a folder, also optional on a representative form part of its cut, middle, and lower sections, respectively pressure in the sample folder, but pay attention to compile the same number of acquisition, to prepare for the identification check. Herbarium real voyage of teaching (certified), Fuzhou plant specimens provided by Xinxiang City Teaching Equipment Co. voyage. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) (www.yuanhang369.com) is an industry leader in Henan Xinxiang, specimen model years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. On the voyage instructional leadership with the staff warmly welcome all inquiries negotiations to create a better future teaching voyage. You can also access (www.yuanhang369.com/supply_details_38125480.html), for more information about the company.