The difference between metallographic and optical microscopes
Microscopes help users observe life, but life contains many samples with different structures, such as birds and animals, as well as soil, sand, and stones. Therefore, when observing different samples, we need to apply different tools. So, what is the difference between a metallographic microscope and an optical microscope?
Microscopes can generally be classified based on their application and structure, and can be divided into biological microscopes, polarizing microscopes, and metallographic microscopes. The metallographic microscope we refer to is actually a branch of the microscope used to observe and study the metallographic structure of certain samples in the industrial field.
In fact, at the end of the day, metallographic microscopes belong to optical microscopes. Metallographic microscopes are essential accessories and functions added to industrial research on the basis of optical microscopes, such as light and dark field observation, polarization observation, and differential interference observation. Metallographic microscopes are generally used as a type of microscope for metallographic testing.
The above is an introduction to the differences between metallographic microscopes and optical microscopes. In fact, there is no difference in the overall structure types of various microscopes, but appropriate modifications are made to the microscopes according to different application needs to meet the corresponding research needs. That's all.
What is the bacterial type III smear observed under a microscope
Three types of bacterial smears observed under a microscope: slicing, smearing, and mounting.
Although various types of microscopes can observe the various forms and structures of bacteria, ordinary optical microscopes are commonly used in laboratories. Due to the small and transparent size of bacteria, which contain a large amount of water in living cells, the absorption and reflection of light are not much different from that of aqueous solutions. When bacteria are suspended in water droplets.
Inspection process
Drip a drop of distilled water onto a clean glass slide, perform aseptic operation with an inoculation ring, take a small amount of the culture, place it in the water droplet of the glass slide, mix it with water to form a suspension and apply it into a thin layer with a diameter of about 1 centimeter. To avoid aggregation of bacteria due to excessive numbers, which is not conducive to observing individual morphology, add another drop of water on one side of the glass slide, dilute another ring from the already coated bacterial solution in this water droplet, and apply it into a thin layer. If the material is a liquid culture or a solid culture, wash the prepared bacterial solution and apply it directly onto the glass slide.
