Bacterial pesticides are a class of biological agents, and the insecticidal effect is closely related to the number and activity of bacteria. When used, there are strict requirements for meteorological conditions. Therefore, the following meteorological conditions must be observed when using bacterial pesticides:
First, the temperature. A suitable temperature for using a bacterial pesticide is 20 ° C or higher. If the temperature is low, the active spores of the bacterial pesticides are slow to propagate in the pests, and the active proteins are not easy to function.
Second, humidity. When using bacterial pesticides, the greater the environmental humidity, the higher the efficacy, especially the application of powdery bacterial pesticides.
Third, the sun. The ultraviolet rays in the sun have a killing effect on spores. If the sunlight directly irradiates the bacterial pesticide for 30 minutes, the spores will die 50%, and the bacterial pesticide will be irradiated for 1 hour, and the mortality rate can be as high as 80%. In addition, ultraviolet radiation also has a deformation-reducing effect on the parasporal crystals. Therefore, bacterial pesticides should be applied after 4 pm or on cloudy days.
Fourth, rain. Heavy rain will reduce the efficacy after application, but drizzle 5 hours after application will not only reduce the efficacy, but also increase the efficacy of bacteria and pesticides.
The commonly used Pipette kits are mainly composed of a pipette and a pipette tip. The pipette tip is a single empty
Cavity reservoir; the pipette uses the principle of air displacement and controls the maximum displacement of the piston by rotating a screw with an ultra-fine thread
displacement, and then control the amount of liquid suction. There are the following problems when using the above kit for suction: 1. The suction volume is controlled by the pipette
After the pipette is sterilized or used for a period of time, it is easy to cause "hidden" failures, which cause the operator to be difficult to detect.
The actual suction volume is inaccurate, and it needs to be adjusted frequently, and the operation is cumbersome and time-consuming; 2. To improve the pipetting accuracy, the operator's
The operation requirements are high, and it is easily affected by factors such as the suction speed, the depth of the tip below the liquid level, and the inclination angle of the pipette.
The actual suction volume will be heard; 3. The actual suction volume will be affected because the suction head cover is not tight and leaking, and it will not be easily detected; 4.
When performing experiments that require high accuracy, such as analysis, in the operation of equal volume aspiration of liquids with different densities, the actual
The actual suction volume will be affected by the density itself; 5. In order to improve the accuracy, this type of pipette needs to carry out high
Cost-optimized design results in extremely high pipette costs.
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