Identification method
Character identification
The whole grass grows to 60cm, yellow-green, old stem slightly square, smooth surface, with a number of longitudinal edges, diameter of about 2mm, section expansion, fibrous roots often at the base section; solid section, the middle of the marrow. Leaves alternate, crumpled into a group, thin and crisp, fragile; full leaves flattened oval lanceolate or lanceolate, 3-9cm long, 1-3cm wide, tip apex, entire edge, base extension Membrane sheath, amplexicaul, veins parallel. Cymes, total ridges heart-shaped ovate, folded, margins are not affiliated; flowers off, bracts membranous, petals blue and black. Gas slightly, sweet and light. It is better to use yellow and green.
Microscopic identification
Leaf surface view: The upper and lower epidermal cells are square or rectangular, scattered with a small number of small needles of calcium oxalate, 7-12 μm long; the stomata is slightly protruding from the epidermis, and the secondary cells are flat out of 4 cells.
Dieffenbachia
Dieffenbachia
Physical and chemical identification
(1) Take 2g coarse powder, add 30ml of water, boil for 30min, and filter. 2ml of the filtrate was taken, 2-3 drops of 0.2% ninhydrin ethanol solution was added, and heated in a boiling water bath for 5 minutes. The solution was blue.
Dieffenbachia
Dieffenbachia
(2) Take 20ml of the above water extract, concentrate in water bath until dry, add 8ml of methanol to dissolve, and filter. Take the filtrate 2ml, add a few drops of concentrated hydrochloric acid, add a small amount of magnesium powder, the solution becomes red. Another 2ml, add a few drops of concentrated hydrochloric acid, add a small amount of magnesium powder, the solution turns red. Another 2ml plus 1% aluminum trichloride methanol solution a few drops, the solution was yellow.
After the collection of pathogenic bacteria specimens, the disposable sampling cotton Swab should be completely inserted into the preservation solution to maximize the retention of pathogenic bacteria.
The collected specimens must be fresh and sent for inspection in time to avoid the death of pathogenic bacteria.
It is forbidden to use products with damaged packaging and expired expiration dates to prevent contamination.
Flexible combination: the number and type of swabs and sampling tubes can be combined arbitrarily.
Wide range of uses: It can be used for the collection, transportation and storage of new coronavirus, respiratory virus, hand, foot and mouth virus and other specimens.
Excellent quality: It has been verified by many medical institutions that the virus can still be detected after being stored in the preservation solution for 7 days at room temperature.
Easy to distinguish: the inactivated and non-inactivated preservation solutions are pink, which can effectively avoid sample addition confusion.
Disposable Virus Sampler,Nasal Virus Sampler Throat Swab,Plastic Transport Tube For Saliva Collection,Viral Transport Tube With Swab
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