Bean sprouts dextrose agar medium Sterile plate, inoculating ring, etc. Penicillium chrysogenum, Escherichia coli, Staphylococcus aureus, Bacillus subtilis; Defoamer (defoaming Agent)
Feature
l Can inhibit the foam forming
l Excellent defoaming property quickly
l Stable and no separated layer in water based system
l Good compatibility with water based resin and no floating oil phenomenon
Application and dosage:
l Water based wood paint/coating
l Water based industrial paint/coating
l Water based automotive trim adhesive
l Emulsion paint/coating
l Water based coating etc.
Remark: Dilute the WC-DF505 by 3~5 times with water and add it into water based system.
Chemical composition:
l Modified polydimethylsiloxane polymer
Technical data:
l Appearance: Yellowish liquid
l pH (25℃): 6~7
l Active ingredient: ~30%
l Viscosity (25℃): 500-1000 Cp
Package, Storage and Transportation
l Available in 200 kg/ barrel or 25 kg/ barrel
l Storage period: ~12 months in closed containers, shady and dry place
Defoamer Agent,Fatty Alcohol Defoamer,Polyether Defoamer,Organosilicone Defoamer Shandong Tiancheng Chemical Co., Ltd. , https://www.tianchengchemical.com Experimental principle
Experimental reagent
Laboratory equipment
Experimental Materials
Experimental procedure
Effects of biological factors on microorganisms (antibacterial spectrum test)
Many microorganisms produce certain metabolites during their life activities, selectively inhibiting or killing other microorganisms, such as antibiotics. The antibacterial spectrum of different antibiotics is different. Some antibiotics only have antibacterial effects on a few bacteria. For example, penicillin generally only has an antibacterial effect on Gram-positive bacteria, and polymyxin only has an effect on Gram-negative bacteria. Antibiotics are called narrow-spectrum antibiotics; others are useful for a variety of bacteria. For example, tetracycline and oxytetracycline have effects on many Gram-positive and Gram-negative bacteria. These antibiotics are called broad-spectrum antibiotics. .
If a strain producing an antibiotic is linearly inoculated on a bean sprout juice dextrose agar medium plate, after the culture, a strain band will grow and an antibiotic will be released to spread around the band. Inoculation of certain different test bacteria in a straight line perpendicular to the strip will produce different lengths of inhibitory bands, as shown in Figure IX-3. According to the length of the antibacterial zone, the effect of the antibiotic on different microorganisms can be judged. This experiment demonstrates the inhibitory effect of penicillin produced by Penicillium chrysogenum on Escherichia coli, Staphylococcus aureus and Bacillus subtilis.