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Article
Modeling of Mixing Time for Bioreactors withSelf-Inducing Impellers
النمذجة الرياضية لزمن الخلط للمفاعلات الحيوية ذات الخلاطات الساحبة للهواء

Author: Alaa K. M علاء كريم محمد
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2008 Volume: 5 Issue: 4 Pages: 569-576
Publisher: Baghdad University جامعة بغداد

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Abstract

The mixing time is one of the most useful criterions for characterization of the broths mixing intensity and for scaling up of biosynthesis processes. This parameter value depends mainly on the presence of biomass in the broths, mixing system characteristics and operating conditions. For quantifying the influence of these factors on mixing efficiency, this study was carried out for simulated fermentation aerated broths consisted of carboxymethyl cellulose sodium salt (CMCNa) taking into account the broth's viscosity, rotation speed (rpm) and the stirrer geometry. The experimental results were used in obtaining a correlation to calculate the mixing time for Re <5000, domain of flow regime for which only few data are available from literature. This model offer a good concordance with the experimental results, the average deviation being of 6.6% for CMCNa solutions and can be used for fermentation scaling up.

يعد زمن الخلط احد اهم العوامل المهمة في تحديد كفاءة الخلط للاوساط الغذائية في المفاعلات الحيوية وكذلك في عمليات توسيع الانتاج. يعتمد هذا الزمن على طبيعة الوسط الغذائي والظروف التشغيليةللعملية التحضيرية وكذلك على الشكل الهندسي للخلاط المستخدم في عملية المزج. استخدم في هذا البحث ملح صوديوم كاربوكسي مثيل سليلوز كمادة مشابهة للوسط الغذائي ذات التخمر الهوائي وتمت دراسة تاثير كل من لزوجة الوسط الغذائي ، سرعة تدوير الخلاط والشكل الهندسي للخلاط على زمن الخلط . استخدم لهذا الغرض مخمر ذات الخلاط الساحب للهواء. تم تحليل النتائج العملية للبحث رياضيا باستخدام برنامج MATLAB بهدف الحصول على موديل رياضي يربط زمن الخلط مع العوامل المذكورة اعلاه في مدى من رقم رينولد اصغر من 5000(Re<5000) وهو المدى الشائع لتشغيل المفاعلات الحيوية للاغراض الصناعية. اعطت هذه المعادلة تطابق جيد مع النتائج العملية المستحصلة من البحث وبمعدل حيود .6.6%


Article
Stability Evaluation of Micro-Screw Im-plant in Cases Given a Bone Inducing Substances "An Experimental in Vivo Study

Author: Mustafa M Al-Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 136-146
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The present study aimed to investigate the desirable loading time of micro-screw implant by stability evaluation and detecting the possibility of using alendronate sodium to increase the stability. Materials and methods: Forty eight micro-screw implant, twelve adult rabbits and fourteen alendro-nate sodium ampoules were used in this study, the rabbits were divided into two main groups, treated and control group, which further subdivided into three subgroups. Eight micro-screw implant instilled in tibiaes of each subgroup just six of them used for test the remaining cancelled, the stability test down using the periotest. These subgroups were nominated according to the loading times which are immedi-ate loading, loading after two weeks and loading after four weeks with stability measured after instilla-tion, before and after loading and two weeks after loading. Results: No significant differences between subgroups before loading and after two weeks of loading but significant after loading. For immediately loaded treated subgroup no significant differences between immediate loading and two weeks after loading. For two and four weeks treated subgroup a significant difference in stability between immedi-ate instillation and after loading. Conclusions: Micro-screw implant even smaller diameter could be used as a fixed anchorage in orthodontics and possibly could be loaded safely from time of immediate instillation, further the use of alendronate sodium add no benefit to increase stability according to the criteria used in this study.


Article
Histological Evaluation of Tissues Using a Bone Inducing Substance in Cases of Micro-Screw Implant "An Experimental In Vivo Study"

Authors: Tahani A Alsandook --- Mustafa M Al-Sultan --- Sabah A Ismail
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 24 Pages: 1-8
Publisher: Mosul University جامعة الموصل

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Abstract

To evaluate the effects of systemically administered Alendronate sodium on osteoclastic activity and osteoblast accumulation. Materials and Methods: Fourty eight micro-screw implant, twelve adult rabbits were used in this study, the rabbits divided into two main groups, treated and control group, which further subdivided into three subgroups according to the healing periods after 2 weeks, 4 weeks and 6 weeks. All animal were treated with alendronate sodium. Eight micro-screw implants instilled in tibiaes of each tested subgroup and six instilled in tibiaes of control subgroups, the tissue facing the micro-screw implant subjected to histological evaluation for the tested subgroups and control sub-groups including the number of active osteoblast and osteoclast. Results: A significant differences be-tween subgroups 0WT, 2WT and 4WT, were more prominent for 2WT and 4WT subgroups from 0WT subgroups which showed score (+++), further no significant difference for control subgroups were all showed score (+++) for osteoblastic activity. For the active osteoclast a significant differences detected between subgroups of experimental and control sample, were score (+) noticed in the 0WT subgroups, score (+) in 2 readings and (++) in 6 readings of4WT subgroups and score (+++) for 4WT subgroups with no significant difference between experimental and control samples in 2 weeks, 4 weeks and 6 weeks healing periods .Conclusions: According to the result of histological evaluation, no estimated differences in the bone remodeling process had been detected between treated and the control group, which may need longer period of drug administration to probably induce effect on bone.


Article
DIAGNOSES OF APRICOT DECLINE PATHOGEN IN NINEVEH GOVERNERAT AND ITS EFFECT ON FOR SALICYLIC ACID INDUCION
تشخيص مسبب تدهور أشجار المشمش في محافظة نينوى وتأثيره في استحثاث حامض السالسليك

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Abstract

This study aimed was to diagnose the causal agent of decline Apricot trees in Nineveh governorate, Pathogenicity , and effects on site infection contents of Salicylic acid for tested cultivars tissue.Phaeoacremonium aleophilum W.Gams, Crous was identify as a major pathogen of decline apricot tree and this is considered the first record of this fungus on apricot in Iraq, and was accompanied with Monilia sp. Percent 15 %.Result of Pathogenicity trial of P.aleophilum and Monilia sp. on apricot local cultivars (LC)Abo-zyngeel showed that P.aleophilum was most aggressive when caused twig decline and stem cankers.(Quzany ,Affly ,Turkey , Abo-zyngeel and Qussay). The highly disease severity was recorded on Qussay and Affly LCs. with 0.63 and 0.65 respectively along with the canker length of about 1.33 and 1.2 cm respectively after one month from inculcation .P.aleophilum showed ability to induce Salicylic acid production in some LC's. particularly on Qussay LC after 2 hours of inculcation (0.758 %), in Turkey LC significant increasing was recorded after one months (0.592%).

توخت الدراسة تشخيص مسبب تدهور أشجار المشمش في محافظة نينوى مع اختبار تأثيراته الامراضية والسمية في محتوى مواقع الإصابة من حامض السالسليك للاصناف المختبرة إذ تم تشخيص الفطر Phaeoacremonium aleophilum W. Gams, Crous, M.J. Wingf. & L. Mugnai, كمسبب لتدهور أشجار المشمش وذلك بعد عزله من سيقان وأفرع أشجار مشمش متدهورة في محافظة نينوى ويعد ذلك أول تسجيل للفطر على المشمش في العراق . رافقه الفطر Monilia sp بنسبة عزل بلغت 15%.إذ أثبتت نتائج القدرة الامراضية للفطرين P.aleophilum و Monilia sp على شتلات مشمش صنف أبو الزنجيل إن الفطر الأول كان اشد أمراضية من الثاني من خلال أحداثة موتا للأفرع وتقرحا للافرع. أظهرت نتائج حساسية أصناف المشمش ( قزاني ، وأفلي ، وتركي ، وابو الزنجيل ، وقيسي) للإصابة بالفطر P. aleophilum إن جميع الأصناف كانت حساسة للإصابة لهذا الفطر و كان أشدها إصابة الصنفين قيسي وافلي بشدة بلغت 0.631 و 0.652 على التوالي وبمتوسط طول تقرح على الأفرع الملقحة بلغا 1.33 سم و 1.2سم على التوالي بعد شهر من التلقيح.كما اظهر الفطر P. aleophilum قدرة في استحثاث حامض السالسليك في بعض الاصناف إذ أن أعلى نسبة حامض سالسليك تم تقديرها في الصنف قيسي بعد ساعتين من التلقيح بلغت 0.758% أما في الصنف تركي فقد ظهرت زيادة معنوية في نسبة حامض السالسليك ولكن بعد شهر من التلقيح بلغ مقدارها 0.592% في حين لم تظهر زيادات معنوية في نسب حامض السالسليك لبقية الأصناف في مواقع التلقيح قياسا بمعاملة المقارنة الا ان الصنف أبو الزنجيل كان أعلاها محتوى من حامض السالسليك.

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