Medical Knowledge: Ultraviolet rays can kill bacteria and viruses

Ultraviolet light is based on the nucleotides that destroy microbial strains.

And then kill the microbial strains, belong to the spectrometer sterilization, instant sterilization, ultraviolet disinfection is a physical sterilization method, not easy to cause all the attached goods, but the characteristics of ultraviolet light also after all ultraviolet light has no continuous sterilization ability, once the ultraviolet lamp stops working, it lacks the ability to sterilize.

Ultraviolet light kills microbial strains based on the nucleotides that destroy microbial strains, and the penetration is poor, so it only kills the germs on the surface of the object.

Ultraviolet light is reasonable for common viral bacteria, such as cold viruses, worms, and streptococcus charcoal.

Escherichia coli, hepatitis B virus.

Dysentery bacilli and so on are reasonable. In addition, ultraviolet disinfection lamps for home packing.

It is recommended to use Shellright's.

Common problem 1: With the increase of use time, the intensity of solar radiation will slowly fade with the increase of use time. Generally, after 5,000 hours of application of the best ultraviolet disinfection lamp in China, the ultraviolet disinfection lamp needs to be replaced.

2. When applying ultraviolet disinfection lamps, attention should be paid to the irradiance distance between the disinfected objects and the ultraviolet disinfection lamps, that is, the suspension height and width ratio of the ultraviolet disinfection lamps should be lower than meters.

3. Prevent the light source from being recognized, and it cannot be exposed to ultraviolet rays for a long time, which is very easy to cause diseases such as cancer.

Yes, so it is often necessary to put bedding and other bedding in the sun to kill bacteria.

The bacteria that can be used by ultraviolet sterilizers are common: anthrax seedlings, diphtheria bacillus, tetanus bacillus, sarcomobiotus, dysentery bacillus, Escherichia coli, Helicobacter, Legionella pneumophila, Streptococcus, Mycobacterium tuberculosis, Proteus, unicellular bacillus, Salmonella, intestinal fever, Typhimurium bacillus, Shigella spp., Staphylococcus spp., Streptococcus spp., etc.

Ultraviolet rays can kill almost all pathogenic microorganisms: UVC ultraviolet rays are easily absorbed by the proteins and nucleic acids of bacteria and viruses, which can denature and dissociate proteins, destroy the DNA and RNA structures of various viruses and bacteria, and lead to the death of bacteria and viruses. All kinds of viruses, bacteria and fungi that are common to us, whether they are in water, air, or attached to the surface of objects, can be killed in a few seconds to three minutes.

These include Escherichia coli, Salmonella, Mycobacterium tuberculosis, fecal fungi, hepatitis B virus, hepatitis A virus, rotavirus, measles virus, rubella virus, and varicella-zoster virus.

Ultraviolet irradiation for 30min can kill E. coli and Proteus. After 40min of irradiation, Staphylococcus aureus and Staphylococcus albicans died. After 60 minutes of irradiation, Bacillus subtilis died.

Therefore, ultraviolet light kills E. coli and Proteus the fastest.

I think the bacteria that UV rays kill the fastest should be mites, because mites are the most afraid of UV rays, and they kill them the fastest.

For ultraviolet sterilization, then generally speaking, it is the fastest to kill mites, because mites are everywhere, so it is said that ultraviolet radiation can kill mites directly.

For the vegetative cells (propagules) of various bacteria, the killing ability of ultraviolet rays is almost the same, almost the same. Basically, it's within a dozen seconds to dozens of minutes.

It's just that the killing ability of bacterial spores and fungal spores is weak, and even has no lethality in a short time.

Ultraviolet light kills microorganisms by destroying microbial nucleic acids, which belongs to spectral sterilization, instantaneous sterilization, ultraviolet sterilization is a physical sterilization method, and will not produce any by-products.

Ultraviolet light is disinfectable, ultraviolet is an electromagnetic wave, the wavelength is less than visible light, most of the ultraviolet rays on the earth's surface come from the sun, common viruses and bacteria and other ultraviolet rays can be killed in vitro, including pneumococcus.

The bacteria killed by ultraviolet rays should be mites, and experiments have proved that when the quilt is exposed to ultraviolet sunlight, mites will die in large numbers.

Which bacteria can be killed by ultraviolet rays the fastest, and many bacteria in general can be killed, so it is said that allowing people to shine in the sun can kill bacteria by irradiating ultraviolet rays.

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Which type of bacteria is the fastest in ultraviolet light? I think the main thing is that some well, stem cells and other bacteria, such as cells, can be killed.

Bacterial propagules, coronaviruses, fungi, rickettsia, chlamydia, etc., all surfaces, water and air contaminated with these viruses can be disinfected with ultraviolet light.

Ultraviolet light can kill bacteria, mainly relying on damaging DNA, which is a genetic material. Short-wave ultraviolet rays are extremely destructive to microorganisms, when the ultraviolet rays in this band irradiate the bacteria, the nucleoprotein and DNA of the cell strongly absorb the energy of the band of burial, and the chain between them is opened and broken, so that the bacteria die.

Direct action. That is, destroying the DNA and other genetic materials of bacteria and viruses, changing the genetic transcription characteristics of cells, and making organisms lose the ability to synthesize proteins and replicate and reproduce.

Indirect action. A certain wavelength of ultraviolet light irradiates photocatalysts such as nano-TiO2 to produce free hydroxide groups and reactive oxygen species with strong oxidation ability, which has a strong photoredox function, can destroy the cell membrane of bacteria and solidify the protein of the virus, and can kill bacteria and decompose organic pollutants.

The sterilization principle of the ultraviolet sterilizer is to use the irradiation intensity of the ultraviolet lamp, which is inversely proportional to the distance of the irradiated disinfectant. When the irradiation intensity of celery worm is constant, the longer the irradiated disinfectant stays and the closer it is to the sterilization lamp, the better the sterilization effect, and vice versa.

The bacteria and viruses that UV lamps can kill are as follows:

Precautions for the use of ultraviolet lamps.

1. Reasonable cooling of ultraviolet lamp: Usually the temperature of the surface of the ultraviolet lamp will be as high as hundreds of degrees Celsius to achieve the maximum output power, therefore, the cooling air volume must be reasonable when designing, otherwise it will directly affect the normal output of the ultraviolet lamp.

If the air volume is too low, the ultraviolet lamp will not be well cooled, and the lamp body will be overheated for a long time, which may cause the lamp body to expand and the electrodes to blacken, which will eventually shorten its lifespan. Regularly check whether the air path and exhaust are smooth;

2. Reasonable reflection system: according to the different requirements of ultraviolet light intensity that users want to obtain, the reflectors configured by equipment manufacturers will be different, therefore, in order to ensure the light intensity index, in addition to regularly cleaning the lamp body, it is also very necessary to clean the reflector.

3. Purple regular rotating ultraviolet lamp: it can maintain the shape and stable output of the lamp well;

4. The lamp is discharged by high-pressure mercury vapor to produce strong long-wave violet radiation (the main line is 365 nm); Strong ultraviolet rays can burn the eyes and**, direct exposure to lights should be avoided during use;

5. If the ultraviolet sterilization and disinfection lamp is accidentally damaged, resulting in mercury vapor emission, the on-site personnel must leave immediately and let the site continue to ventilate for 20-30 minutes to prevent mercury vapor from being inhaled into the body and causing poisoning; When it is safe, the site should be cleaned up in time, and the mercury raw materials of ** can be retained for experimental use;

6. Each ultraviolet lamp has unique mechanical and electrical parameters, and it is very important to provide a supporting driving power supply. The power supply of transformer, capacitor or electronic circuit must be selected to match the parameters of the lamp;

7. Lighting the lamp too frequently: it will cause both ends of the lamp to turn black prematurely, and gradually affect the main part of the lamp, which will also turn black, and finally lead to the reduction of the output power of the lamp;

8. Avoid too frequent cold start of the lamp, when a lamp is lit at the beginning stage, the internal voltage is very low. The electrodes at both ends will emit tungsten during this time, which will cause many punctate pollutants to be produced inside the lamp, which will become one of the reasons for the premature damage of the lamp, so the lamp should be lit under high voltage conditions and the lighting time should be shortened;

9. The life of the lamp is affected by many factors, such as: the number of lights, the working time after each lighting, the operation data of electricity and heat, and whether the lamp is properly handled, etc., will affect the life of the lamp; Therefore, the average life guaranteed by the manufacturer is usually the average life.

10. Ensure the stability of the input power supply in the use environment, and if the power fluctuation range of the use environment is large, it is recommended to equip a voltage regulator to ensure the stable output of the UV lamp.

Summary. Ultraviolet disinfection includes bacterial propagules, spores, mycobacteria, coronaviruses, fungi, rickettsial and chlamydia, and can be used to disinfect surfaces, water and air contaminated by these viruses.

What bacteria and viruses can UV lamps kill? What should I pay attention to when using it?

Ultraviolet disinfection includes bacterial multiplication and liquid quiet, spores, mycobacteria, coronaviruses, fungi, rickettsial and chlamydia, etc., and all surfaces, water and buried air contaminated by the above-mentioned viruses can be disinfected with ultraviolet light.

Precautions for use: 1. When using ultraviolet lamps to irradiate and kill viruses, it should be forbidden to be present to avoid injuries due to direct ultraviolet rays on people's eyes and **. Second, ultraviolet rays have no penetration, straight line transmission, and there are three major sterilization blind spots:

1. It can only sterilize and disinfect the upper surface of the object (food), but not the lower surface of the object. 2. When multiple objects overlap, the surface of the overlapping part of the object cannot be sterilized and disinfected. 3. Only the celery pin can sterilize and disinfect the outer surface of the object, but cannot sterilize and disinfect the inside of the object.

In other words, places that cannot be irradiated by ultraviolet light (invisible light) cannot play a role in sterilization and disinfection. 4. During use, the surface of the ultraviolet lamp should be kept clean, generally wiped with an alcohol cotton ball every two weeks, and wiped at any time when there is dust and oil on the surface of the lamp. 5. When disinfecting indoor air with ultraviolet lamp, the room should be kept clean and dry, dust and water mist should be reduced, the temperature should be lower than 20 or higher than 40, and the irradiation time should be appropriately extended when the relative humidity is greater than 60%.

6. When disinfecting the surface of articles with ultraviolet rays, the irradiated surface should be directly irradiated by ultraviolet rays, and the irradiation dose should be sufficient.

Hope it helps.