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| No.13634650
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Information Name: | Herbarium show voyage teaching (certified), herbarium |
Published: | 2015-01-17 |
Validity: | 0 |
Specifications: | Limited |
Quantity: | |
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Detailed Product Description: | Prepare specimens commonly used preservative fixed drug, what the advantages and disadvantages? Alcohol: scientific name ethanol plant specimens into the oil, the chemical structural 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 in tissue permeability, mixing alcohol preservative was added, 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 teaching herbarium, 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, specimen shrinkage, up to about 20%, and can dissolve fat and lipids. Thus, lipid rich organs such as the brain herbarium specimens, do not use alcohol fixative. Another drawback is that it's real fast evaporation plant specimens, easily lost. Most plant material can be made to preserve dried specimens. Herbarium specimens of plants is studied in plant taxonomy and plant most commonly used as a teaching dried specimens. "There is no herbarium specimens, there is no plant taxonomy." Plant Herbarium specimens advantage is easy to make, easy to save, easy to use. Herbarium specimens of plants is mainly applied to the seed plants and ferns, also applies to part mosses, lichens, fungi, algae and plants. The basic steps are made: Acquisition - finishing - repression - in other paper - Disinfection - took office paper. Herbarium show voyage teaching (certified), plant specimens provided by Xinxiang City Teaching Equipment Co. voyage. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) 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, and satisfy customer needs. On the voyage instructional leadership with the staff warmly welcome all inquiries negotiations to create a better future teaching voyage. |
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Copyright © GuangDong ICP No. 10089450, Xinxiang City voyage Teaching Equipment Co. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
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You are the 26457 visitor
Copyright © GuangDong ICP No. 10089450, Xinxiang City voyage Teaching Equipment Co. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility