Ong, Chun Keat (2005) A preliminary study of effects of audible sound energy to microorganisms. Universiti Malaysia Sabah. (Unpublished)
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Abstract
This preliminary study is to determine the effect and the effectiveness of an alternative energy such as audible sound energy in affecting the level of contamination in industry products that dealing with microorganism by looking at the growth of microbes in pasteurized milk. The audible sounds that were used in this preliminary study are frequency of 20 Hz, 200 Hz, 2000 Hz, 20000 Hz, white noise and pink noise. Three pasteurized milk samples which are then taken to sound treatment for 2 hours are prepared with one of them under controlled. After count the colonies of microbes from milk samples that growth in the culture media prepared before, data analysis had been done by using SPSS 11.5 for Windows software. Based on the result from data analyzed, it can be conclude that, there is an effect of audible sound on microorganisms in the pasteurized milk. Frequency of 20 Hz and 200 Hz would increase the growth of microbes in milk, meaning that it would increase the level of contamination in pasteurized milk. While white noise, pink noise, frequency of 2000Hz and 20000 Hz would decrease the growth of milk microbes. The most effective audible sound in reducing the growth rate of microbes in milk is frequency of 20000 Hz, while the most effective audible sound in increasing the growth of microbes in milk is frequency of 200 Hz.
| Item Type: | Academic Exercise |
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| Keyword: | effectiveness, alternative energy, audible sound, level of contamination, microorganism, pasteurized milk |
| Subjects: | T Technology > TX Home economics > TX1-1110 Home economics > TX341-641 Nutrition. Foods and food supply Q Science > QR Microbiology |
| Department: | SCHOOL > School of Food Science and Nutrition |
| Depositing User: | SITI AZIZAH BINTI IDRIS - |
| Date Deposited: | 25 Sep 2013 10:27 |
| Last Modified: | 17 Oct 2017 11:11 |
| URI: | https://eprints.ums.edu.my/id/eprint/7062 |
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