Mutaman Ali A. Kehail, رغدة علاء الدين صلاح الدين محمد, ياسر محمد عبدالرحيم

كلية الهندسة والتكنولوجيا-جامعة الجزيرة · السودان

Centrifuge machine extraction has been introduced as a rapid method for extraction of oil from plant parts in addition to conserve time, solvent and energy. The aim of this study is to put regression models for extraction percentage of oils extracted from some oil-seeds (Groundnuts, Sesame and Castor) by using three speeds (low, medium and high) of the Centrifuge machine (model: 80-1, Made in China) using hexane solvent. About 50 g of each of the selected oil-seeds were brought from the Agricultural Research Corporation, Wad Medani, Gezira State, Sudan. The seeds were crushed and kept in plastic bags in order not to lose the oil. The extraction process was run in a Laboratory of Faculty of Engineering and Technology, University of Gezira. The samples were prepared in 2 g for each and were rolled carefully within filter papers and fine tissues. The low (1000 rpm), medium (2000 rpm) and the high speed of the device (4000 rpm) were used during this study. The total extraction period was 18 minutes for Groundnut and Sesame seeds, while it was 24 minutes for Castor seeds. The solvent volume was 1.0 ml/g seed/2 minutes. The estimation of the extraction percentage was depended on the weight of the sample before and after the extraction at any time for each speed. The regression tools was used to analyzed the obtained data and to draw the % extraction-time line. The standards of oil content of USDA of Groundnut, Sesame and Castor seeds was concerned for comparison. The results showed that, the extract reached mean of 45% from Groundnut seeds (100% extraction) within 18 minutes at a rate of 2.31% extract/minute from a hypothetical starting point of 6.7, using only 8 ml of hexane. Using the same regression model, the extract reached mean of 45% from Sesame seeds (100% extraction) within 18 minutes at a rate of 1.91% extract/minute from a hypothetical starting point of 7.4 using 18 ml of hexane, while it reached mean of 46% from Castor seeds (100% extraction) within 22 minutes at a rate of 1.91% extract/minute from a hypothetical starting point of 3.1 using 22 ml of hexane. It was clear that, in all cases, the high the speed used in the Centrifuge, the high was the percentage oil extract. The study recommends continuing researches on centrifugation principle to improve oil extraction methods.

بوكربوط عز الدين, خولة شيبوط, هاجر داودي

كلية العلوم الاجتماعية والإنسانية-جامعة زيان عاشور - الجلفة · الجزائر

تلعب وسائل التواصل الاجتماعي دورًا حيويًا في تعزيز إقبال المرأة على المشاريع الصغيرة. توفر هذه المنصات فرصًا غير مسبوقة للتواصل مع جمهور واسع وترويج المنتجات والخدمات بسهولة وبتكلفة منخفضة،ومن خلال وسائل التواصل الاجتماعي، يمكن للنساء عرض مهاراتهن وإبداعاتهن، وبناء علاقات مع العملاء والمستثمرين، والحصول على ملاحظات فورية لتحسين الأداء، بالإضافة إلى ذلك تسهم هذه الوسائل في تعزيز الثقة بالنفس والإحساس بالقدرة على تحقيق النجاح المهني،حيث يمكن القول بأن وسائل التواصل الاجتماعي أصبحت أداة قوية لدعم وتمكين النساء في تحقيق طموحاتهن في عالم ريادة الأعمال. .

Souhila Kerbab , Ghoul M

كلية علوم الطبيعة والحياة-جامعة فرحات عباس - سطيف1 · الجزائر

إيمان علاق, خيرة شريفي

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة الدكتور يحيى فارس بالمدية · الجزائر

هدفت هذه الدراسة إلى محاولة معرفة دور نظم المعلومات في تقييم أداء الموارد البشرية كما توجد علاقة طردية بين نظم المعلومات و الموارد البشرية

رائد الكوني, صالح سليم فهمي فارس, نضال جرادات

كلية الدراسات العليا-جامعة النجاح الوطنية · فلسطين

Background:Phenolic compounds are a group of secondary metabolites which are found in many medicinal plants and have a critical role in defense against pathogens and inhibiting different oxidative stress related diseases like cancer.This study screened Verbascum fruticulosum phytoconstituents and evaluated the total phenol, tannin, and flavonoid content. In addition, it evaluated the antioxidant and antimicrobial activities of these compounds.Methodology: Antioxidant activity was analysed using the 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) method, while phyto-constituents, total phenols, tannins, and flavonoids were screened and evaluated using standard analytical methods for phytochemicals. Antimicrobrial activity was evaluated using a broth micro-dilution method against American Type Culture Collection (ATCC) reference strains including Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecium, Shigella sonnei, Candida albicans, and a clinical isolate of multidrug resistant Staphylococcus aureus (MRSA)., except Epidermophyton floccosum strain where was used agar dilution method.Results: The phytochemical screening showed that all extracts except n-hexane contained phenol and tannins. Only aqueous and acetone extracts contained flavonoids, so they had the highest antioxidant activity. Total phenol and flavonoid content was highest in acetone extracts, while methanolic extract showed the highest total tannin content. Antibacterial tests showed that the best inhibition activity of the methanol and acetone extracts were against P. arginosa with minimum inhibitory concentrations (MICs) of 1.56 mg/ml in both cases. Furthermore, the acetone extract also showed the highest inhibiting activity against S. aureus and E. coli with MICs of 6.25 mg/ml. Aqueous extract showed the highest inhibition activity against S. aureus (MRSA) with a MIC value of 3.125 mg/ml. The highest antibacterial activity of the methanol andn-hexane extracts were against E. faecium and S. sonnei with MICs of 3.125 mg/ml, in each respective assay. For antifungal inhibition the best activity was shown by the n-hexane extract against E. flacosum with a MIC value of 1.56 mg/ml.Conclusion: Aqueous extracts showed the highest level of antioxidant activity, methanol and acetone extracts showed the highest antibacterial activity. While, n-hexane was considered the best antifungal extract. High level of phenolic compounds found in Verbascum fruticulosum that could be included in new antibiotic and anti-cancer drugs designs.

قاسم ربيعة, ناجي نورة

جامعة زيان عاشور - الجلفة · الجزائر

لقد حاولنا مف خلاؿ دراستنا ىذه التعرؼ عمى الأثر الذي تحدثو خصوصية العمؿ بعقدمحدد المدة، ولقد تبيف لنا مف خلاؿ النتائج توصمنا إلييا أف مثؿ ىاتو العقود رغـ إيجابياتياإلا أنيا تتميز بسمبيات عديدة، قد ذكرناىا في النتائج، لكف الشيء الذي يمكف التركيز عميوىو أنو رغـ أف ىذه العقود تسعى إلى تحقيؽ أىـ الأىداؼ المسطرة ليا، ألا وىي تخفيؼمف حدة البطالة، إلا أف ومف ىلاؿ ما رأيناه واستنتجتناه في الدراسة الميدانية أف تبقى ىاتوالمناصب في إطار حموؿ ترقيعية في إطار ما يعرؼ بسياسة شراء السمـ الاجتماعي، ولأفىذه المناصب تعتبر مناصب فائضة ىف الحاجات الفعمية لممؤسسة يمكف إدراجيا في إطارما يعرؼ بالبطالة المقنعة، ويبقى السؤاؿ مطروح إلى متى تعالج مشكمة البطالة بيذهالأساليب غير المدروسة.

زوبير زرزايحي, عبدالله بوجلال

كلية أصول الدين-جامعة الأمير عبد القادر للعلوم الإسلامية · الجزائر

تحدث الجانب النظري عن نشأة الأقمار الصناعية والبث التلفزيوني الفضائي المباشر، ثم ظهور الفضائيات العربية عموما والدينية خصوصا، بعدها كان الحديث عن نوعية البرامج المقدمة من طرف هذه الفضائيات من حيث طرق تحضيرها وإعدادها والقائم بالاتصال فيها، والرسائل التي ت

Abdelraheem Eljilani Ahmed, بابكر عبدالوهاب

كلية الدراسات العليا-جامعة السودان للعلوم والتكنولوجيا · السودان

Infertility is a global health issue affecting approximately 8-10% of couples. It is a multidimensional problem with social, economic and cultural implications. Lately an increasing examined by transvaginal probe,. Number of couples with infertility problems chooses the artificial insemination.This is the Descriptive cross sectional study population consisted of 125 infertile women who sought medical help in Kordofan State, Sudan. From August 2018 to December 2018. Collection of data was performed by means of a specifically data sheet; It included questions concerning the causes of infertility.The main results regarding type of infertility 68.8% primary infertility and 31.2% secondary infertility. Regarding age, 3.2 % were 15-20 years old, 54.4% were 21-30 years old, 42.2% were 31-40 years old. As to occupation status, 28% were employee and 72% were house wives.Regarding socioeconomic status 39.2% were high, 50.4% were moderate and 10.4% were low. Concerning the causes of infertility, 76% were due to PCOD, 16.8% were due to fundal fibroid, 4% were due to hydrosalpenx, 1.6% were due to endometrioma and 1.6% were due to others ( dermoid cyst, cervical polyp), 51.2% had menstrual disorders. Concerning the risk factors 80.8% had a positive risk factors (obesity 77.6%, psychological factor 28.8% ).The objective of this study to study the female infertility using ultrasound , to find the relationship between frequency of incidence and different risk factors.Conclusion: The main causes of female infertility are problems in the ovaries, uterus and fallopian tubes.

Haddadi Khelifa , L. Louail

جامعة فرحات عباس - سطيف1 · الجزائر

حسين عليوي ناصر الزيادي , حسين عواد حسوني حبيب البركات

كلية الآداب -جامعة ذي قار-جامعة ذي قار · العراق