Effect of N2 laser fluence on lactic acid production by Streptococcus thermophilus
Joint Authors
Talfah, Nafi Abd al-Latif
Baqir, Abd al-Wahid
Hammadi, Ziyad Nasif
Source
Issue
Vol. 1, Issue A1 (31 Dec. 2002), pp.55-62, 8 p.
Publisher
University of Baghdad Institute of Laser and Plasma for Postgraduate Studies
Publication Date
2002-12-31
Country of Publication
Iraq
No. of Pages
8
Main Subjects
Topics
Abstract AR
ھدفت الدراسة إلى تحسین أنتاج حامض حامض اللاكتیك بتعریض عزلات بكتریا اللاكتیك إلى أشعة لیزر النتروجین.
و جمع لھذا الغرض 15 نموذج من منتجات الألبان المتخمرة من الأسواق المحلیة و بعض مصانع الألبان في بغداد و ضواحیھا.
أمكن تشخیص 11عزلة تعود لبكتریا اللاكتیك الكرویة عبر إخضاعھا إلى كافة الفحوصات الزراعیة و المجھریة و الكیموحیاتیة.
و لاختبار قابلیة العزلات على أنتاج الحامض فقد نمیت في وسط الشرش.
و تم اختيار عزلة تعود لبكتریا Streptococcus thermophilus لمعاملتها بلیزر النتروجین ذا الطول الموجي1ر337 نانومتر.
ثم قورنت العزلات المعرضة للیزر مع العزلات الأبویة من حیث تركیز حامض اللاكتیك المنتج و الأس الھیدروجیني .
Abstract EN
The aim of this work was to improve the lactic acid production by subjecting lactic acid isolates to N2 laser radiation.
Fifteen samples of fermented dairy products were collected from local markets.
Two others were brought from the dairy product manufacture of Abu Ghraib and other dairy product factories in Baghdad. Eleven isolates were identified as Cocci lactic acid bacteria.
All isolates had been subjected to the biochemical tests (catalase production, gelatin liquefaction, growth in litmus milk, NH3 from arginine, CO2 production, growth at 10 and 45 oC, growth at 4 % NaCl, growth at 0.1 % of methylen blue and fermentation of nine carbon compounds.
For selecting efficient isolates in production of lactic acid, all isolates were propagated in whey medium.
After propagation one isolate S9 of Streptococcus thermophilus produced highst total titrable acid (TA %) when it reached 1.28 % therefore this isolate was selected for subjection to N2 laser with wavelength of 337.1 nm, with different fluences.
After treatment with N2 laser at fluence of 18.95 J/cm2, production of lactic acid by this isolate reached 17 mg / ml.
American Psychological Association (APA)
Talfah, Nafi Abd al-Latif& Baqir, Abd al-Wahid& Hammadi, Ziyad Nasif. 2002. Effect of N2 laser fluence on lactic acid production by Streptococcus thermophilus. Iraqi Journal of Laser،Vol. 1, no. A1, pp.55-62.
https://search.emarefa.net/detail/BIM-370392
Modern Language Association (MLA)
Talfah, Nafi Abd al-Latif…[et al.]. Effect of N2 laser fluence on lactic acid production by Streptococcus thermophilus. Iraqi Journal of Laser Vol. 8, no. A1 (2002), pp.55-62.
https://search.emarefa.net/detail/BIM-370392
American Medical Association (AMA)
Talfah, Nafi Abd al-Latif& Baqir, Abd al-Wahid& Hammadi, Ziyad Nasif. Effect of N2 laser fluence on lactic acid production by Streptococcus thermophilus. Iraqi Journal of Laser. 2002. Vol. 1, no. A1, pp.55-62.
https://search.emarefa.net/detail/BIM-370392
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 61-62
Record ID
BIM-370392