The biosafety cabinet is used to protect the operator, the laboratory environment and the experimental materials from the infectious experimental materials such as primary cultures, bacterial strains and diagnostic specimens, so as to avoid being exposed to the above-mentioned operation process. May be designed for infectious aerosols and spills. When working with liquids or semi-fluids, such as shaking, pouring, stirring, or dropping liquids on a solid surface or another liquid, aerosols are possible. Streak the agar plate, inoculate the cell culture bottle with a pipette, use a multi-channel sampler to transfer the suspension of infectious reagents to the microplate, homogenize and vortex the infectious material, and infect the infection Infectious aerosols may be generated by these laboratory operations when centrifuging sexual fluids and performing animal operations. Because the naked eye cannot see aerosols with a diameter of less than 5 μm and tiny droplets with a diameter of 5 to 100 μm, laboratory staff are usually not aware that particles of this size are forming and may inhale or cross-contaminate other materials on the work surface. . It has been shown that the correct use of biological safety cabinets can effectively reduce laboratory infections and cross-contamination of cultures due to aerosol exposure. Biological safety cabinets can also protect the environment.
Over the years, the basic design of biological safety cabinets has undergone several improvements. The main change is the addition of HEPA filters in the exhaust system. For particles with a diameter of 0.3 μm, the HEPA filter can retain 99.97%, while for larger or smaller particles it can retain 99.99%. This characteristic of the HEPA filter allows it to effectively trap all known infectious agents and ensure that the air discharged from the safety cabinet is completely free of microorganisms. The second improvement in the design of the biological safety cabinet is to transport the HEPA filtered air to the work surface, thereby protecting the items on the work surface from contamination. This feature is often referred to as the protection of subjects. These basic design changes have improved the three levels of biological safety cabinets.
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Most of us go through our lives eating potato chips without ever stopping to think about the bag that they come in. Potato chip bags? Well, I`m not going to explain to you why those bags are only half full but rather why the packaging itself is far more interesting than is apparent at first glance. You see, everybody knows that the packaging does have a significant impact on the taste of the food (amongst other things like the longevity and the marketability of the product)
When you take a moment to consider the many functions that chip packaging must provide, the complexity of the bag and its materials actually makes a lot of sense. The bag must be able to protect the contents from environmental moisture; otherwise, you`d have soggy chips every time you packed a bag in your lunchbox with an icepack or cold drink. On the other hand, you don`t want grease leaking through the bag and getting all over the place. And let`s not forget that fats are very vulnerable to absorbing unwanted odors and tastes.
The reason why those bags are rather complex is because they are supposed to keep contaminants and moisture outside while simultaneously preventing the leaching of it`s own components. So how exactly are they doing it? With multiple layers of polymer materials. The bag itself consists of various layers of polymers and a thin layer of aluminum foil which acts as an oxygen barrier.
Potato Chips Packaging needs to be strong enough to withstand normal handling, but still be easy to open when you`re ready to dig in. All the materials used must be food-safe and approved by the government, so they have to be things that won`t leach chemicals into the chips. To top it all off, the package design has to be attractive and informative so that consumers will choose your brand of potato chips out of the dozens of options available.
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