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However, it is essential to note that UV sterilizers use UV-C light to bring about disinfection. The catch here is that this UVC light is as harmful to humans as it is to microorganisms. You’re, however, not at risk of any harm whatsoever provided you don’t expose yourself to the UV bulb by touching or looking at it while it is on.

Fast forward to today, there is full acceptance of UV disinfection as an efficient and effective chemical free treatment for the elimination of microbiological contaminants from water, and point-of-entry UV is becoming a standard mainstream feature in homes. The UV water filter system combines UV treatment with other forms of filtration, such as sediment and carbon block filters and is used as pre and post treatment on reverse osmosis systems.

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Purification using a UV water treatment system is one of the most effective techniques for removing bacteria from water. Not only does it attack harmful bacteria but also other dangerous pathogens in water that can cause diseases such as typhoid, cholera, gastroenteritis, hepatitis, flu, etc. UV systems can destroy 99.99% of harmful microorganisms, including bacterial, viruses, fungi, and protozoans such as Escherichia coli, Giardia, Cryptosporidium, Salmonella etc. UV treatment also quickly eliminates viruses and other microorganisms that are highly resistant to chlorine, e.g., the hepatitis virus.

With the many advantages of a UV water filter it is an excellent decision to install a whole house UV water filter or a High Output UV System for commercial use to ensure that whatever water you use is free of germs, bacteria and viruses.

At an intensity of 254nm, UV light emits enough radiation to damage bacterial DNA and the DNA in other microorganisms. This germicidal wavelength of radiation falls within the UV-C radiation wavelength. A UV water treatment system usually consists of a UV light source (at about 254nm output) mounted in front of a flow chamber where the water will pass. A glass quartz sleeve which allows the UV wavelength to pass through unhindered usually holds the UV lamp. The glass quartz is necessary to protect the UV lamp from water.

However, UV light is not so effective at removing particles from water or eliminating some contaminants in water, such as heavy metals (e.g., lead, mercury, and iron), chlorine, and Volatile Organic Compounds (VOCs). UV disinfection also does not remove bad taste and odor from water.

Objective lens

The longest objective lens is an oil immersion objective lens, which magnifies 100x. The total magnification is 1000x if the eyepiece lens is 10x power. The oil immersion objective lens is used for examining the detail of individual cells, such as red blood cells. This lens requires a special oil to form a link between the edge of the objective and the cover slip. Before you use an oil immersion objective lens, ensure the specimen is in focus under the high-power objective lens. After you remove the high-power objective, put a tiny amount of oil onto the cover slip above the specimen, and then move the oil immersion lens into position.

As the water passes through the flow chamber, it becomes exposed to the germicidal UV light source. At this stage, the harmful microorganisms present in the water become inactivated. The UV water purifier can be used both on a large scale and small scale and water from most sources. For example, you can use a UV light for well water, spring water, lake water, surface water and wafer from a municipal water supply.

Which objective lens should beinposition before you store amicroscope

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Every microscope has an eyepiece lens, which is the lens at the top that you look through. A tube connects the eyepiece lens to objective lenses, which enhance the magnification power of the eyepiece lens. The eyepiece lens is usually 10x or 15x power (i.e., what you look at appears to be 10 times or 15 times closer than it actually is). A rotating nosepiece or turret holds two or more objective lenses, and you can easily switch between them to change power. A microscope's stage is the flat platform that holds the slides. Some microscopes also have a condenser lens, which focuses the light onto the object, and a diaphragm or iris, which is a revolving disk with holes of varying sizes. The iris is used to vary the intensity and size of the light that is streamed upward into the slide.

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Before you use a microscope, it helps to know what all the different parts are for. Many people believe that the objective lenses are the most important components of a microscope. Basically, without them, your microscope experience would be very disappointing.

Although the germicidal property of the sun was known as far back as 1877, the concept was not fully understood. From then on, research into the disinfection principles began. In 1903, Niels Finsen was awarded the Nobel Prize for his use of UV light to combat tuberculosis. However, it was not until the 1950s that significant research into the use of UV light for water disinfection began. By the 1960s, the principle was already widely used in commercial applications and gradually introduced into the residential market.

One cannot be too careful when it comes to the aspect of safety. After all, we are exploring the potentials of UV water purification to ensure we have safe drinking water in the first place. So is UV water purification safe? Yes, UV water treatment is safe! A significant reason why it is safe is that it eliminates the use of harmful chemicals. Besides, UV light water filters do not alter the composition of water, meaning, in essence, that water remains water.

A UV water filter is a purifier that kills harmful microorganisms in water with the use of germicidal ultraviolet (UV) light. UV water treatment is possible because UV light damages the nucleic acids in the DNA of microorganisms, thereby severely hampering their ability to reproduce or multiply.

Microscope

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Gillespie, Claire. "What Are The Functions Of The Objective Lenses?" sciencing.com, https://www.sciencing.com/functions-objective-lenses-6470088/. 27 April 2018.

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Feb 4, 2020 — The objective lens is one of the most important parts of a microscope, since it determines its basic performance and function.

How to usemicroscope

Gillespie, Claire. What Are The Functions Of The Objective Lenses? last modified March 24, 2022. https://www.sciencing.com/functions-objective-lenses-6470088/

Most microscopes come with at least three objective lenses, which provide the majority of image enhancement. The function of objective lenses is to magnify objects enough for you to see them in great detail.

A scanning objective lens that magnifies 4x is the shortest objective and is useful for getting a general overview of a slide. A low-power objective lens magnifies 10x, but remember that it is coupled with an eyepiece lens, so the total magnification is 10x times the power of the eyepiece lens. A high-power objective lens magnifies 40x, with total magnification 400x if the eyepiece lens is 10x power, and it is ideal for observing very fine detail, such as nerve cells in the retina or the striations in skeletal muscle.

Lithium Fluoride (LiF) Windows provide high transmission from 150nm to 6 microns and are ideal for VUV, UV, or infrared applications.

Opticalmicroscope

There are numerous benefits to the use of UV water purification. This is why this disinfecting method is still in existence even after over a century. So what are the advantages of UV water purification?

UV water treatment is much safer than the use of chlorine or chloramine treatment. One of the reasons is because UV light treats water for protozoa, while chlorine and chloramine disinfection is unable to do that. Also, the use of chlorine treatment requires the use of retention tanks and the precise use of injection pumps and solutions. UV water filters are now employed by many wastewater treatment plants to eliminate some harmful chemical by-products generated from chlorine or chloramine treatment.

Gillespie, Claire. (2018, April 27). What Are The Functions Of The Objective Lenses?. sciencing.com. Retrieved from https://www.sciencing.com/functions-objective-lenses-6470088/

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