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Comparison between laser light-scattering method and traditional methods in identifying some Campylobacter and Staphylococcus isolates from foods

مقارنة بين طريقة التشتت الضوئي الليزري والطّرائق التّقليدية في تمييز بعض الأنواع البكتيرية التابعة للجنسين Campylobacter و Staphylococcus المعزولة من الأغذية

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 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




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Species of the genus Campylobacterare recognized as the main cause of foodborne disease in both developing and developed countries. They are main causative of diarrhea and gastroenteritis worldwide. Staphylococcus bacteria especially S. aureus are responsible of food poisoning due to their ability to produce enterotoxins. Traditional methods which are used to identify bacteria are time-consuming and labor intensive and very expensive. Thirteen isolates of Campylobacter and twenty-two isolates of Staphylococcus were isolated from a variety of foods. Traditional methods based on biochemical tests were used for identification in addition to laser light-scattering technique to discriminate isolates. Laser light-scattering technique showed the ability to distinguish all isolate in high accuracy, rapid and low costs manner, thus it may represent a potential alternative to traditional methods to identify these bacteria. So it is a very important issue to find new alternative methods characterized by high accuracy, low costs and rapidity in results achievement, to replace traditional methods, thus laser light-scattering may be a possible alternative


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Research summary
تعد البكتيريا التابعة للجنسين Campylobacter وStaphylococcus من أهم مسببات الأمراض المنقولة عن طريق الغذاء. تتطلب الطرق التقليدية المستخدمة في تمييز أنواع البكتيريا وقتًا طويلاً وجهدًا كبيرًا، بالإضافة إلى تكاليف مرتفعة. لذلك، تم تطوير تقنية تشتت الضوء الليزري كبديل محتمل. في هذه الدراسة، تم عزل 13 عزلة من Campylobacter و22 عزلة من Staphylococcus من مصادر غذائية مختلفة. أظهرت النتائج أن تقنية تشتت الضوء الليزري قادرة على تمييز جميع العزلات بدقة عالية وسرعة وتكلفة منخفضة، مما يجعلها بديلاً محتملاً للطرق التقليدية. تعتمد تقنية تشتت الضوء الليزري على استخدام حزمة ضوئية ليزرية بطول موجة 635 نانومتر تمر من خلال مركز المستعمرة، مما يشكل بصمة فريدة يمكن استخدامها في كشف وتمييز البكتيريا. أظهرت النتائج أن هذه التقنية غير تدميرية، حيث لا تتأثر المستعمرة المدروسة ويمكن استخدامها في الاختبارات اللاحقة. بالإضافة إلى ذلك، فإنها تقنية منخفضة التكلفة لأنها لا تحتاج إلى كواشف أو أوساط خاصة. توصي الدراسة بإجراء دراسات إضافية لتقييم كفاءة هذه التقنية في تمييز أنواع أخرى من البكتيريا الهامة في مجال الأغذية ودراسة تأثير شروط النمو على أطياف التشتت الضوئي للبكتيريا.
Critical review
دراسة نقدية: تعتبر هذه الدراسة خطوة مهمة نحو تحسين طرق الكشف عن البكتيريا الممرضة في الأغذية. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، لم يتم توضيح تفاصيل كافية حول كيفية إعداد العينات واختيارها، مما قد يؤثر على دقة النتائج. ثانياً، لم يتم مقارنة تقنية تشتت الضوء الليزري مع تقنيات حديثة أخرى مثل تقنيات البيولوجيا الجزيئية التي قد تكون أكثر دقة. ثالثاً، الدراسة اقتصرت على عدد محدود من الأنواع البكتيرية، مما يجعل من الصعب تعميم النتائج على نطاق أوسع من البكتيريا. وأخيراً، لم يتم مناقشة تأثير العوامل البيئية مثل درجة الحرارة والرطوبة على دقة تقنية تشتت الضوء الليزري، وهو ما يمكن أن يكون له تأثير كبير على النتائج في البيئات العملية.
Questions related to the research
  1. ما هي البكتيريا التي تم دراستها في هذا البحث؟

    تم دراسة البكتيريا التابعة للجنسين Campylobacter وStaphylococcus.

  2. ما هي التقنية البديلة التي تم اقتراحها في الدراسة؟

    تم اقتراح تقنية تشتت الضوء الليزري كبديل للطرق التقليدية.

  3. ما هي مزايا تقنية تشتت الضوء الليزري مقارنة بالطرق التقليدية؟

    تتميز تقنية تشتت الضوء الليزري بالدقة العالية، السرعة في الحصول على النتائج، وانخفاض التكاليف.

  4. هل تقنية تشتت الضوء الليزري تدميرية للعينة؟

    لا، تقنية تشتت الضوء الليزري غير تدميرية، حيث لا تتأثر المستعمرة المدروسة ويمكن استخدامها في الاختبارات اللاحقة.


References used
ADAMS, M. R.;MOSS, M. O. 2000,Food microbiology. 2nd ed.,Cambridge, UK: The Royal Society of Chemistry, 194–199
BAE, E.; BANADA, P.P.;HUFF, K.;BHUNIA, A.K;ROBINSON, J.P;HIRLEMAN, E.D.2008,Analysis of time-resolved scattering from macroscale bacterial colonies. J. Biomed. Opt. VOL.13,014010. http://dx.doi.org/10.1117/1.2830655
BANADA, P.P.;GUO, S.;BAYRAKTAR, B.;BAE, E.;RAJWA, B.;ROBINSON, J.P.;HIRLEMAN, E.D.;BHUNIA, A.K. 2007. Optical forward-scattering for detection of Listeria monocytogenes and other Listeria species. Biosens. Bioelectron, VOL. 22,1664–1671. http://dx.doi.org/10.1016/j.bios.2006.07.028
BANADA, P.P.;HUFF, K.;BAE, E.;RAJWA, B.;AROONNUAL, A.;BAYRAKTAR, B.;ADIL, A.;ROBINSON, J.P.;HIRLEMAN, E.D.;BHUNIA, A.K. 2009,Label-free detection of multiple bacterial pathogens using light-scattering sensor. Biosens. Bioelectron.Vol. 24, 1685–1692. http://dx.doi.org/10.1016/j.bios.2008.08.053
BAYRAKTAR, B.;BANADA, P.P.;HIRLEMAN, E.D.;BHUNIA, A.K.;ROBINSON, J.P.;RAJWA, B. 2006,Feature extraction from light-scatter patterns of Listeria colonies for identification and classification. J. Biomed. Opt., Vol. 11,34006. http://dx.doi.org/10.1117/1.2203987
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