- - محمد البخيت يوسف عطا المنان
- published on 6/11/2017
- التقنيات الحديثة والمهنة المكتبية بمكتبات جامعة الجزيرة.
هدفت الدراسة لمعرفة واقع مكتبات جامعة الجزيرة بالتركيز علي التقنيات المستخدمة ونوعية العاملين بالمكتبات من ناحية والتطلعات المهنية ومواكبة التطورات الحديثة في التخصص والمهنة من ناحية أخري. واتبعت الدراسة المنهج الوصفي بشقيه المسحي ودراسة الحالة. توصلت الدراسة لنتائج أهمها: إدارة جامعة الجزيرة لها خطط مستقبلية في تطوير مهنة المكتبات من ناحية المباني والأطر المهنية وحوسبة الإجراءات الفنية. لعمادة المكتبات في ظل التنظيم الإداري الجديد دور كبير في خلق بيئة مناسبة لتدريب الأطر المهنية علي الجوانب التقنية والأنظمة الآلية. ومن أهم توصيات الدراسة تشجيع المكتبي دون وضع قيود تقليدية تحد من آفاقه وتطلعاته المهنية ، السعي لتوفير الأجهزة والمعدات والمعينات لتطوير المهنة. وفيما يتعلق بالتدريب المهني والتبادل الوظيفي يجب التعامل مع الأطر المهنية بأسلوب لا مركزي يتم فيه تنقلهم من مكتبة كلية إلي أخرى لتطوير الأداء التقني.
published in مجلة جامعة البطانة للعلوم الإنسانية والاجتماعية
- - عيسى عثمان محمد علي
- published on 6/26/2017
- Antifungal activity of nano emulsions of neem and citronella oils against phytopathogenic fungi, Rhizoctonia solani and Sclerotium rolfsii
Biopesticides are considered to be safe, target specific, biodegradable and eco-friendly. These, especially AzadirachtaindicaA. Juss. (neem) based biopesticides, are mainly used as emulsified concentrate (EC). There is growing interest in nanoemulsions based on phytochemical mixtures, due to their better efficacy, compared to conventional biopesticides. A. indica seed oil and Cymbopogonnardus (L.) Rendle(Citronella) oil are known to have pest control properties. However, their utilization is often restricted, due to relatively low water- solubility. This drawback can be overcome by encapsulating oils in oil-in-water (O/W) emulsions or nanoemulsions, using low- or high- energy methods. In this study, various nanoemulsions of crudeneem and citronella oils with surfactants were developed andcharacterised by Dynamic Light Scattering (DLS) and Transmission Electron Microscope (TEM).Composition of various ingredients of nanoemulsions was standardised. TEM study showed the spherical shape of neem and citronella oil nanoemulsions.The average size of droplets of neemnanoemulsion (NNE) with different percentage of citronella oil ranged from 11.23 ± 3.86 nm to 17.80 ± 4.52nm, while that of citronellananoemulsion (CNE) with different percentage of neem oil ranged from 8.12 ± 2.80 nm to 12.04 ± 3.74 nm. It was found that increase in surfactant ratio to neem oil or citronella oil decreases the size of droplets in nanoemulsions.Further, in vitro antifungal study against Rhizoctonia solani and Sclerotium rolfsii was carried outby poisoned food technique. Results showed that neem nanoemulsion 10 (NNE10) and citronella nanoemulsion 10 (CNE10) were most active against R. solani (ED50 19.94 mg L-1and 27.89 mg L-1) and S. rolfsii (ED50 15.09 mg L-1 and 22.26 mg L-1). The standardization of the composition and development of citronella essential oil- and neem oil- based nanoemulsions and their antifungal activity against thesetwo fungi has been reported for the first time.
Keyword: Nanoemulsions, Neem oil, Citronella oil, surfactant, DLS, TEM, Rhizoctonia solani, Sclerotium rolfsii
published in Industrial Crops & Products
- Fadl Elmoula Abd alla Idris Hassan ب - فضل المولي عبدالله إدريس
- published on 10/28/2018
- Developing Software Program to Simulate Blended Materials Properties
Textiles are much more than means of keeping the human body warm. and portect it from weather changes. They are also means of decorating our homes and improving our working environment. For industrial application, they compete with glass, wires, plastics, ceramics and all forms of sheet materials. As for clothing they compete with plastics and leather and as for carpets they compete with stone, wood and other flooring materials.In this study the properties of materials commonly used for textile, were graded into four grades (excellent, good, fair and unsatisfactory). Each grade was given special weight, in order to convert a qualitative properties into quantitative. Fabrics were also classified into classes according to their end uses (eg:dressing fabric, army dressing, curtains, furniture, etc). Specific criteria was set for each class and ten properties were tested for each class of fabric..
C-language was used to build Software package capable to select the desired material that meet the specific purpose to estimate properties of fabric produced from blended materials and to choose an optimum combination satisfy the consumers in terms of quality as well as price. . It is found that by using this software the user can predetermine the properties of any fabrics produced for any season. The user of this software also can estimate the properties of any fabric produced by a blend of any fibres. Choices are available when the price of the product is a crucial factor. By using this software the test which require more than 24 hours can be carried out within a few minutes and number of instruments will no longer be used.
- Azhari Siddeeg Abdelwahab Ahmed - ازهري صديق عبد الوهاب احمد
- published on 10/1/2018
- Extraction and Characterization of Peppermint (Mentha piperita) Essential Oil and its Assessment as Antioxidant and Antibacterial
The aim of this study is to extract and characterize peppermint essential oil and assess it as antioxidant and antibacterial activity. The extraction processes, chemical composition, total phenolic contents (TPC), total flavonoid contents (TFC), antioxidant and antibacterial activity were studied. The oil was extracted by three methods: steam distillation, solvent and soxhelet. The results indicated that the highest oil extraction was obtained by soxhelet method 1.5±0.12 and 1.2±0.12 ml/100 gm and the lowest result recorded by steam distillation 1.1±0.09 and 0.9±0.14 ml/100gm from fresh and dry samples, respectively. The chemical composition of fresh and dry sample were determined by using gas chromatography and the results showed that there were 26 components of volatile compounds were identified in the essential oil isolated from peppermint. The antibacterial potential of mint essential oils was evaluated by Muller Hinton agar well diffusion method against selected bacteria. The essential oils showed higher activity against Staphylococcus aureus and Salmonella 19±1.41 and 16.5±2.12 mm, respectively, for fresh sample and showed lower activity against Escherichia coli and Klebsilla pneumonia 8.5±0.70 mm and nil, respectively, for dry sample. The TPC of fresh and dry samples were 14.00±0.12 and 8.80±0.09 mg /kg, respectively. TFC of the mint essential oil was determined in comparison with rutin were 8.1±0.09 and 5.0±0.07mg/kg, for fresh and dry sample, respectively. The results showed decrease in peroxide value at 30, 60, 90, 120 and 150 min compared with blank sample without essential oil for wet and dry mint. DPPH inhibition percentages were recorded and inhibition concentrations at 50% activity (IC50) were 0.651±0.09, 0.683±0.6 and 0.161±0.07 mg/mL for wet, dry samples and standard respectively. It can be recommended that further study on sensory analysis of food products containing mint essential oil to evaluate its acceptability and shelf life.
published in Gezira Journal of Engineering and Applied Sciences