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Article
INFLUNCE OF WATER CURING TEMPERATURE ON SOME MECHANICAL PROPERTIES OF SCC PRODUCED FROM RECYCLED AGGREGATES.
تأثير حرارة ماء الإنضاج على بعض الخواص الميكانيكية لخرسانة ذاتية الرص المنتجة من الركام المعاد

Author: Nadia. M. Al - Abdalay نادية منعم العبدلي
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2014 Volume: 5 Issue: 2 Pages: 117-138
Publisher: University of Kufa جامعة الكوفة

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Abstract

The utilization of recycled aggregates can minimize environmental impact and slow the huge consumption of natural resources used for concrete applications. However, recycled aggregates are not suitable for use in the production of High Performance Concrete (HPC) due to their relatively high absorption capacity, unstable properties and recycled aggregates' weaker strength. Such inadequacies can be overcome through carefully examining the characteristics of recycled aggregates and then adopting proper mixture proportions. The mechanical properties of self compacting concrete (SCC) are well understood. But there are no scientific investigations available on the influence of a heat water treatment on the properties of SCC produced from recycle aggregate. To evaluated the influence on the mechanical properties five mixture were designed, SCC without recycled concrete aggregate and four ( SCC with 25% recycled concrete aggregate SCC with 50% recycled concrete aggregate, SCC with 75% recycled concrete aggregate and SCC with 100% recycled concrete aggregate) and exposed to heat of treatment water with different temperatures ( 40-100 )Cₒ. It has been found that there is possible to produce SCC with various percentage of recycled concrete by using a suitable dosage of SP which was a major component in producing good quality RCA( recycled concrete aggregate ). Also found an influence of the composition of the concrete, especially the quantity of recycle aggregate and heat of curing water on mechanical properties of concrete (compressive strength, splitting tensile strength and flexural strength).

أن استخدام الركام المعاد يمكن من تقليل الأثر البيئي ويقلل كذلك من الاستخدام الضخم للموارد الطبيعية في تطبيقات الخرسانة. ومع ذلك يعتبر الركام المعاد غير ملائم للاستخدام في أنتاج خرسانة عالية الأداء بسبب خاصية الامتصاص العالية نسبيا , عدم استقرار خواص الخرسانة وضعف مقاومة الركام المعاد ويمكن التغلب على هذه النواقص من خلال دراسة خصائص الركام المعاد بعناية ومن ثم اعتماد نسب الخلط المناسبة . أن الخواص الميكانيكية للخرسانة ذاتية الرص مدروسة ومفهومة بشكل جيد ولكن لاتوجد دراسات علميه كثيرة حول تأثير ارتفاع درجة حرارة ماء الإنضاج على خواص خرسانة ذاتية الرص ألمنتجه من الركام المعاد استخدامه . ولدراسة هذا التأثير تم تصميم خمس خلطات خرسا نية ، خرسانة ذاتية الرص لا تحتوي على ركام خرسانة معاد وأربع خلطات تحوي على ركام معاد بنسبة ( 25-100) % وتم إنضاجها بدرجات حرارة مختلفة لماء الإنضاج (40-100) درجة مئوية. وجد انه من الممكن أنتاج خرسانة ذاتية الرص وبنسب مختلفة من الركام المعاد استخدامه باستخدام جرعة مناسبة من الملدن المتفوق والذي يعتبر عنصر أساسي في أنتاج خرسانة ركام معاد. وجد هناك تأثير لمكونات الخرسانة وخاصة كمية الركام المعاد استخدامه وحرارة ماء الإنضاج على الخواص الميكانيكية للخرسانة (مقاومة الانضغاط, مقاومة الشد, مقاومة الانثناء).


Article
Effect of Fire Flame (High Temperature) on the Self Compacted Concrete (SCC) One Way Slabs

Authors: Ammar A. Hammadi --- Amer F. Izzat --- Jamal A. Farhan
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2012 Volume: 18 Issue: 10 Pages: 1083-1099
Publisher: Baghdad University جامعة بغداد

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Abstract

Experimental work was carried out to investigate the effect of fire flame (high temperature) on specimens of one way slabs using Self Compacted Concrete (SCC).By using furnace manufactured for this purpose, twenty one reinforced concrete slab specimens were exposed to direct fire flame. All of specimens have the same dimensions. The slab specimens were cooled in two types, gradually by left them in the air and suddenly by using water. After that the specimens were tested under two point loads, to study, the effect of different: temperature levels (300ºC, 500ºC and 700ºC), and cooling rate (gradually and sudden cooling conditions) on the concrete compressive strength, modulus of rupture, flexural strength and the behavior of reinforced concrete slab specimens and comparing the results with specimens without burning (reference specimens). The results showed that, the concrete compressive strength, concrete modulus of rupture and the flexural strength decreases while the maximum (central) deflection increases with increasing the fire flame temperature. For suddenly cooled specimens the residual flexural strength is less than that of gradually cooled specimens while the deflection is greater. For slabs with 20 MPa concrete strength and gradually cooled, the residual bending strength percent is 81.5%, 75% and 62.3% ,while the increase in central deflection is 5%, 33%, and 105% at burning temperature 300ºC, 500ºC and 700ºC respectively. For suddenly cooled specimens of the same strength and exposed to the same temperatures above the residual flexural strength is 77.9%, 68.3% and 58.3% while the increase in central deflection is 25%, 52%, and 118% respectively. When the strength of concrete specimens increase, the residual flexural strength experiences small increase and the increase is of lower rate in the central deflection for 300 ºC and 500 ºC burn temperatures while the decrease is significant for 700 ºC burning temperature.

تم اجراء بحث عملي لبحث تأثير درجات الحرارة العالية (الحريق) على نماذج من البلاطات المسلحة باتجاه واحد والمصنعة من الخرسانة ذاتية الرص. باستخدام فرن تم تصنيعه لهذا الغرض,تم تعريض واحد وعشرون نموذج بلاطة خرسانية الى حرارة اللهب المباشر , وجميع النماذج لها نفس الابعاد . ثم تبرد النماذج بطريقتين, تبريد بطئ بتركها في الهواء, وتبريد فجائي باستخدام الماء وتحميلها بنقطتي تحميل لدراسة تاثيرمختلف: درجات الحرارة المختلفة (300ºC, 00ºC5 و( 700ºC , و معدل التبريد (تدريجي , فجائي) على مقاومة الخرسانة, معامل الكسر, مقاومة الانحناء وتصرف البلاطات الخرسانية ومقارنة النتائج مع النماذج غير المحروقة (نماذج السيطرة). أظهرت النتائج أن مقاومة الخرسانة, معامل الكسر, ومقاومة الانحناء تقل بينما يزيد الانحراف الأقصى بزيادة درجة حرارة الحريق . كما أظهرت النتائج أنه لحالة التبريد الفجائي فان مقاومة الانحناء المتبقية تقل بينما يزيد الانحراف الأقصى مقارنة مع حالة التبريد التدريجي حيث تبين أن نسبة مقاومة الانحناء المتبقية للبلاطات ذات مقاومة (20MPa) والمبردة تدريجيا هي 81.5% , 75% و 62.3% بينما كانت نسبة الزيادة في الانحراف الأقصى 5% , 33% و 105% للنماذج المعرضة الى 500ºC, 300ºC و700ºC على التوالي . أما لحالة التبريد الفجائي ولنفس المقاومة ودرجات الحريق أعلاه فان مقاومة الانحناء المتبقية هي 77.9% , 68.3% و 58.3% بينما كانت الزيادة في الانحراف الأقصى 25%, 52% و118% على التوالي. كما أظهرت النتائج أن الزيادة في مقاومة الانضغاط تؤدي الى زيادة في نسبة مقاومة الانحناء المتبقية بمقدار قليل بينما تزيد نسبة الانحراف الأقصى بمقدار ضئيل عند الحرق بدرجات حرارة (ºC 300 و ºC 500) وتقل بمقدار مهم عند الحرق بدرجة حرارة ºC 700 .


Article
Experimental Behavior of Circular Steel Tubular Columns Filled with Self-Compacting Concrete under Concentric Load
السلوك العملي للاعمدة الفولاذیة الانبوبیة الدائریة و المملؤة بالخرسانة ذاتیة الرص تحت تأثیر حمل محوري

Authors: Saad N. Sadik --- Wael S. Abdul-Sahib --- Ammar A. Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 14 Part (A) Engineering Pages: 2760-2772
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents an experimental study on the behavior of circular, concretefilled,steel tube (CFT) columns concentrically loaded in compression to failure. Selfcompactingconcrete (SCC) is used here as a filler in order to increase homogeneity ofthe core and reduce segregation problems. Total six column specimens with differentlengths (0.4 m – 1.5 m) of constant diameter of 160 mm and wall thickness of 2.8 mmwere tested. The purpose here is to investigate the ultimate capacity and thedeformation behavior of different slenderness ratio columns. The behavior of thesecolumns in confinement was discussed.Experimental results indicate that the compression force capacity is affected byslenderness ratio of the column. For slender column the overall buckling was observedwhile for the short columns the crushing and the local buckling is the dominant failureshape.

Keywords

circular --- column --- steel --- SCC --- slenderness


Article
Angiogenesis and MMP-2expression in Oral Squamous Cell Carcinoma&Verrucous Carcinoma and its Correlation with Clinicopathological Parameters

Authors: Bashar H. Abdullah --- Seta A. Sarkis --- Ban F. AL Drobie
Journal: Diyala Journal of Medicine مجلة ديالى الطبية ISSN: 97642219 Year: 2014 Volume: 6 Issue: 1 Pages: 15-26
Publisher: Diyala University جامعة ديالى

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Abstract

Background: An important step of tumor progression in which Matrix metalloproteinase have been implicated is angiogenesis, because these enzymes degrade the extracellular matrix and provide a permissive microenvironment for the growth of new blood vessels.The present study conducted to evaluate the immunohistochemical expression ofMatrixmetalloproteinase -2(MMP-2) andangiogenic marker (CD34) in Oralsquamous cell carcinoma(SCC)versus verrucous carcinoma(VC) and to correlate their expressions with the clinicopathological parameters.Material & Methods: MMP-2 and CD34 expression was examined immunohistochemically in twenty four paraffin tissue blocks of squamous cell carcinoma and verrucous carcinoma (twelve cases of each). Results: All cases of Oral SCC exhibited positive immunostaining for MMP-2, while only one case of VC showed –ve expression. Interestingly all cases of VC showed –ve MMP-2 immunostaining of the basal cell layer. Generally lymphatic vessels were more than blood vessels in both VC&SCC cases. The mean MMP-2 immunoexpression was (59.00%) for both stage I &stage II, while the higher CD34 immuno expression was in stage I. The mean expression of MMP-2 was higher in well differentiated OSCCs, while for CD34 it was higher in poorly differentiated OSCCs followed by moderately differentiated, then well differentiated, however no statistically significant difference was found. Non- significant correlation was found concerning the expression of both markers for both lesions.Conclusion: No statistical correlation was found between MMP-2 expression and angiogenesis in OSCC and OVC.

Keywords

SCC --- VC --- MMP-2 --- CD34


Article
Experimental Behavior of Self Compacting Concrete Corbels Strengthened with External CFRP

Authors: Sarmad Sh. Abdulqader --- Basil S. Al-Shathr --- Ali Kh. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (A) Engineering Pages: 154-162
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This research aims to study the influence of using Carbon Fiber Reinforced Polymer (CFRP) strips as an external strengthened and repairing material on the behavior of self-compacting concrete (SCC) Corbels. The experimental work involved testing twenty self-compacting concrete corbels specimens. The experimental work is divided into two parts; the first part consists of three groups to investigate the most effective direction, position, bonding type and amount of CFRP strips on the behavior of corbels and utilized it in practice, also to strengthen new variables that are investigated in the second part. Two groups in part one are strengthened with different numbers of inclined and horizontal direction of CFRP strips, while in the third group the specimens were strengthened with strips of CFRP having different directions and bond types to improve the strength capacity and behavior of corbels. This improvement is represented by increase cracking load by about (94)% and increase in their ultimate load capacity of strengthening corbels which varies from about (19 to 88)%. While the second part of experimental work included the following variables: shear span to effective depth ratio (a/d), amount of horizontal steel reinforcement stirrups and repaired damaged corbels. The reinforced concrete corbels in this part were strengthened and repaired by CFRP strips depending on optimum result that is produced from part one wherefrom position, direction and amount are considered. It was found for un-strengthened and strengthened corbels having same horizontal secondary reinforcement stirrups that when (a/d) ratio decreases from 0.65 to 0.4 causes increase in cracking and ultimate loads reach (55)% and (35.41)% respectively. For un-strengthened and strengthened corbels having same (a/d) ratio, it was found an increase in cracking load which varies from (6.66 to 34.78)% and from (18.18 to 52.63) % in ultimate load when horizontal secondary reinforcement stirrups are increased. It was also found repairing SCC corbels with CFRP strips causes an increase in ultimate load reaching up to (50)% with respect to un-strengthened specimens. From results it is concluded that strengthened or repaired corbels present stiffer load deflection response than corresponding un-strengthened corbel (control corbel).

Keywords

Corbel --- Strengthen --- SCC --- Carbon Fiber.


Article
Bladder Mucosal Pathological Changes Accompany High Grade and Squamous Cell Bladder Tumors

Author: Jassim Mohammad Alkhazraji
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2011 Volume: 10 Issue: 4 Pages: 536-541
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT:BACKGROUND:Carcinoma of the bladder is the second most common cancer in Iraq. The status of the bladderurothelium other than the principal lesions can provide distinct diagnostic information with regard totreatment response and outcome. Positive mucosal biopsy results are a significant indicator ofintravesical recurrence. Currently, in our urological practice, the importance of performing this step incystoscopy is relatively underestimated.OBJECTIVE:The objective of this study is to carry out a histological assessment of 'extra-tumor' bladder mucosa fordysplasia, and correlate the resulting findings of dysplasia with the grade, the type, and the macroscopicappearance of the tumor.MATERIALS AND METHODS:A total of 350 biopsies were taken by cystoscopy from 68 patients admitted with bladder tumors, eitherby cold-cupped biopsy forceps or resectoscope as part of TUR of the tumor. Normal-looking mucosa ofthe bladder was included in each patient's biopsy in a four quadrant way. All biopsies were examinedby the same histopathologist. All patients were managed according to their presentation, cystoscopicand histopathological findings.RESULTS:Statistical analysis showed that the highest significant difference was obtained in patients with tumorgrade, low against high grade (p<0.005). However, a noticeable difference was found in the other twocomparison groups, namely, the type, transitional against squamous and the macroscopic appearance,papillary against solid (p<0.05).CONCLUSION:The high grade, solid tumors and squamous cell carcinoma are associated with general bladder mucosaldysplastic changes which may exclude the bladder preserving procedures as an option of surgicaltreatment. In Iraq, more extensive studies are necessary to come out with appropriate guidelines for abetter treatment and outcome of bladder carcinoma which is a major health problem


Article
Bladder Mucosal Pathological Changes Accompany High Grade and Squamous Cell Bladder Tumors

Author: Jassim Mohammad Alkhazraji
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2010 Volume: 9 Issue: 4 Pages: 536-541
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT:BACKGROUND:Carcinoma of the bladder is the second most common cancer in Iraq. The status of the bladderurothelium other than the principal lesions can provide distinct diagnostic information with regard totreatment response and outcome. Positive mucosal biopsy results are a significant indicator ofintravesical recurrence. Currently, in our urological practice, the importance of performing this step incystoscopy is relatively underestimated.OBJECTIVE:The objective of this study is to carry out a histological assessment of 'extra-tumor' bladder mucosa fordysplasia, and correlate the resulting findings of dysplasia with the grade, the type, and the macroscopicappearance of the tumor.MATERIALS AND METHODS:A total of 350 biopsies were taken by cystoscopy from 68 patients admitted with bladder tumors, eitherby cold-cupped biopsy forceps or resectoscope as part of TUR of the tumor. Normal-looking mucosa ofthe bladder was included in each patient's biopsy in a four quadrant way. All biopsies were examinedby the same histopathologist. All patients were managed according to their presentation, cystoscopicand histopathological findings.RESULTS:Statistical analysis showed that the highest significant difference was obtained in patients with tumorgrade, low against high grade (p<0.005). However, a noticeable difference was found in the other twocomparison groups, namely, the type, transitional against squamous and the macroscopic appearance,papillary against solid (p<0.05).CONCLUSION:The high grade, solid tumors and squamous cell carcinoma are associated with general bladder mucosaldysplastic changes which may exclude the bladder preserving procedures as an option of surgicaltreatment. In Iraq, more extensive studies are necessary to come out with appropriate guidelines for abetter treatment and outcome of bladder carcinoma which is a major health problem.


Article
•Immunohistochemical Cytokeratine 20 over expression in urinary bladder carcinoma

Authors: Shoroq Mohammad Abbas Al-Temimi --- Maather Baqer Hussein Al-Harmoosh
Journal: Karbala Journal of Medicine مجلة كربلاء الطبية ISSN: 19905483 Year: 2011 Volume: 4 no 2 Issue: 10 Pages: 1077-1083
Publisher: Kerbala University جامعة كربلاء

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Abstract

this study was conducted to estimate the over expression of CK 20 protein in human bladder carcinoma (transitional cell carcinoma in comparison to squamous cell carcinoma) and to show its possible correlation to the pathological parameters (gradeand stage) of TCC cases . We evaluated the available tissue blocks of 50 patients with bladder carcinoma lesions (40 with TCC & 10 cases with SCC) who had referred to Al-diwaniya Hospital between January 2007 and December 2010.The mean age of the patients was 55 years (range, 33 to 77 years). The TCC were classified according to grades into grade I, II and III in 20 (50%), 10 (25%), and 10 (25%) cases, respectively and according to stages into Ta in 10 (25%), T1 in 10(25%), T2 in 10(25%) and T3 in 10(25%). From 40 cases of TCC, A total of 28 (70%) patients were positive for over expression of CK20 and no expression were found in cases SCC. High histological grades of the TCC were associated with decrease expression of CK 2 .There were 20 (100%) in GI , 5 (50%) in GII , 3 (30%) in GII (P = .0000) while CK20 expression decreased as the tumor stages increased , it was 10 (100%) in Ta , 8 (80%) in T1 , 6 (60%) in T2 , 4 (40%) in T3 , and there is a statistically significant correlation with the stages of TCC of bladder (p=0.0229 ) .Aim of the Study: This study was conducted to estimate the over expression of CK-20 protein in human bladder TCC in comparison to bladder SCC lesions and to show its possible correlation to the pathological parameters of TCC like (grade and stage) .Key ward: - Bladder TCC, Bladder SCC, Cytokeratin 20, IHC

Keywords

Bladder TCC --- Bladder SCC --- Cytokeratin 20 --- IHC


Article
FIRE FLAME EFFECT ON THE STRENGTH OF SELF – COMPACTING CONCERETE
تأثير لهب النار على مقاومة الخرسانة ذاتية الرص

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Abstract

This study aims to investigate the effect of fire flame on some mechanical properties of self-compacting concrete specimens. To determine the workability, different test methods are adopted in this research such as slump-flow, T50 slump-flow, L-box, U-box and V-funnel. The concrete specimens were subjected to fire flame at the lower surface only to reach temperatures around 400,500 and 600 °C for one hour, then they were cooled gradually to room temperature. After that, they were tested for weight loss, compression, splitting and flexural and compared with specimens not subjected to fire flame (reference mix). Based on the results of this work, it may found that the compressive strength of self- compacting concrete decreases with fire temperature exposure. The residual values of compressive strength were (71-88) % of the strength for the reference specimens. The flexural strength is more sensitive to fire flame temperatures. The residual flexural strengths were in the range of (58- 81) % of the flexural strength for the reference specimens. The splitting tensile strength was extra sensitive than the compressive strength. The residual splitting tensile strength were in the ranges of (58- 90) % of the splitting strength for the reference specimens. The weight loss of concrete specimens increases with increasing fire temperature. The reduction in weight loss ranged between (3.47-6.17) % relative to reference specimens.

تهدف هذه الدراسة للتحقق من تأثير لهب النار على بعض الخواص الميكانيكية للخرسانة ذاتية الرص. لقياس قابلية التشغيل, استخدمت عدة طرق منها فحص الانسياب, زمن الانسياب, الصندوق على شكل حرف L, الصندوق على شكل حرف U, القمع على شكل حرف V. تم تسليط لهب النار على السطح السفلي للنماذج الخرسانية للوصول الى حرارة 400 ,500 و 600 م0 لمدة ساعة واحدة, بعدها تم تبريد النماذج تدريجيا الى درجة حرارة الغرفة. تم قياس فقدان الوزن, الانضغاط, الانشطار والانثناء للخرسانة ذاتية الرص ومقارنتها مع نماذج غير معرضة الى النار (خلطة مرجعية).بناءا على النتائج, تناقصت مقاومة الانضغاط بزيادة التعرض الى درجة الحرارة. القيم المتبقية لمقاومة الانضغاط كانت تتراوح بين (71 – 88) % قياسا الى الخلطة المرجعية, كما وجد ان مقاومة الانثناء حساسة اكثر الى حرارة لهب النار. وان القيم المتبقية لمقاومة الانثناء تراوحت بين (58 – 81) % قياسا الى الخلطة المرجعية. مقاومة الانشطار وجدت بانها حساسة اكثرمن مقاومة الانضغاط الى حرارة لهب النار. حيث كانت القيم المتبقية لمقاومة الانشطار تتراوح بين (58 – 90) % قياسا الى الخلطة المرجعية. كما لوحظ ان النقصان بالوزن يزداد بزيادة درجة حرارة الحرق. وتراوحت قيم النقصان بالوزن بين (3,47 -6,17) % قياسا الى الخلطة المرجعية.


Article
9.EVALUATION OF PHOSPHO-AKT IMMUNOHISTOCHEMICAL EXPRESSION IN PATIENTS WITH LARYNGEAL SQUAMOUS CELL CARCINOMA

Authors: Nisreen S. Wanas نسرين شريف وناس --- , Luma Y. Mehdi --- Liqa K.A. Alzubaidi
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2018 Volume: 16 Issue: 2 Pages: 177-181
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Background: Akt, is a serine/threonine protein kinase which act as an important regulator of cell proliferation and survival. The Akt complex is upregulated by phosphorylation producing phospho-Akt, which trigger a continued cell proliferation and survival and inhibit apoptosis, thereby promote cell survival.Objective: To evaluate the immunohistochemical expression of phosphorylated Akt (Phospho-Akt) in laryngeal squamous cell carcinoma (SCC) and to be correlated with different clinicopathological parameters.Methods: Phospho-Akt expression was investigated Immunohistochemically in 49 formalin-fixed paraffin embedded laryngeal SCC tissue sections collected from Teaching laboratories - Baghdad Medical City.Results: Phospho-Akt positive immunostaining appears in 57% of samples. Akt activation present in advanced stages of tumors with p value 0.02.Conclusion: The current findings may provide evidence that aberrant expression of Akt contributes to the pathogenesis (mechanism of disease development) of laryngeal SCC.Keywords: Akt, phospho-Akt, immunohistochemistry, laryngeal SCC, larynxCitation: Wanas NS, Mehdi LY, Alzubaidi LKA. Evaluation of phospho-AKt immunohistochemical expression in patients with laryngeal squamous cell carcinoma. Iraqi JMS. 2018; 16(2): 177-181. doi: 10.22578/IJMS.16.2.9

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