Control of micro organisms by radiation and how radiations are lethal to microbes
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The document discusses the control of microorganisms through radiation, highlighting its importance in preventing disease transmission and contamination. It explains various types of radiation, including gamma rays and ultraviolet light, and their effects on microbial growth, particularly through damaging genetic material. The significance of radiation sterilization in various industries such as healthcare and food is emphasized.
Control of micro organisms by radiation and how radiations are lethal to microbes
- 1. Presentation of microbiology Name:Ayesha tahir Roll No.871 Uni roll no:023822 Presented to:sir fazal elahi
- 2. Control of micro organisms by radition
- 3. Control of micro organisms Control of microbial growth means to inhibit or prevent growth of microorganisms. OR The term control refers to the reduction in number or activity of total microbial flora
- 4. Importance of micro-organisms Microbes are important. • Play key role in nutrition cyle • Biodegradion • Climate change • Control the diseases
- 5. Reasons for controlling micro organisms • Control of microorganisms is essential in order to prevent the transmission of diseases and infection • stop decomposition and spoilage • prevent unwanted microbial contamination.
- 6. Radiation Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.
- 10. Gamma rays • High energy Radiation • Emit from certain radio isotopes such as Co. • The are capable of great penetration into matter. • The are lethal to all life including micro organisms
- 11. Physical STERLiZSTION/Radition STERLiZSTION STERLiZSTION by radition is known as cold STERLiZSTION. Beacuse no heat is use in this method . Radition STERLiZSTION relies on ionizing radition.Gamma rays play important role in cold STERLiZSTION.
- 12. X Rays • Lethal to micro organisms • Unlike ultra violet radition they have considerable energy and penetration ability. • They are impractical for purpose of controlling microbial population bcz they are expensive.
- 13. How ionizing radiation control the growth of microbes radiation causes damage to the genetic material - the DNA or the RNA - of the organism's cell. If the DNA or RNA of a microorganism is damaged, the cell will die.
- 15. Non-ionizing radiation Non-ionizing radiation is any kind of radiation in the electromagnetic spectrum that does not have enough energy to remove an electron from an atom and turn it into an ion. Non-ionizing radiation includes the spectrum of ultraviolet (UV), visible light, infrared (IR), microwave (MW).
- 16. Ultra violet radiation • The ultra violet portion of spectrum include all radiation from 150-3900 Å. Lamps • All availablewhich emit high concentration of UV light in the most effective region, 2600-2700Å. Example • Germicidal lamps which emit UV radiation are widely used to reduce microbial population. e.g. Hospital operating rooms, pharmaceutical industries, food and dairy industriesfor treatmentof contaminating surfaces.
- 17. Mode of action Ultraviolet light is absorbed by many cellular material but most significantly by nucleic acid where it does the most demage. Demage DNA by producing thyamine dimers which cause mutation.