RJABS May-August 2019

Developments in Polymer Nanocomposites for Modern Biomedical and Industrial Applications: A Review

Ahmed Hashim and Zinah Sattar Hamad

Abstract The modern types of nanocomposites are promising materials in the different applications such as: thermal energy storage and release, antibacterial, piezoelectric, sensors, radiation shielding, solar cells, diodes ...etc. The using of nanocomposites in different applications related to the important properties of nanocomposites which are included good optical, thermal, electrical properties with low cost and low weigh. This review discusses the uses of polymer- ceramic nanocomposites for modern applications for radiation shielding, thermal energy storage and release and humidity sensors. The studies inducted to the polymer- ceramic nanocomposites have good performance for radiation shielding, thermal energy storage and release and humidity sensors applications.

[ FULL TEXT PDF 1-9 ] DOI:10.22587/rjabs.2019.14.2.1


Response of Lettuce Plants to Foliar Application of Amino Acids Under Different Rates of Vermicompost

Abd El-Rheem Kh. M.Heba S. El-Batran and M. H. Mohammed

Abstract Two field experiments were conducted during the winter seasons of 2017-2018 and 2018-2019 at the Agricultural Production and Research Station, National Research Centre (NRC), Nubaria Province, Egypt. The experiments aimed to study the effect of vermicompost and foliar application of amino acid on growth, quantity and quality yield and nutritional status of lettuce plants(lactuca sativa L.) cv. Batavia green. Four rates of vermicompost (0, 1, 2 and 3 ton fed-1)were added before seedlings were planted and the soil preparation. The results indicated thatincreasing the addition of vermicompost levels from 0 to 3 ton fed-1 led to a greater increase in lettuce growth and yield with high concentration of amino acids (500 ppm). As well as increasing in amino acid spraying rates from 250 to 500 ppm leads to an increase in lettuce yield quality (chlorophyll a, b, carotenoids, vitamin C and carbohydrate), if no vermicompost is added or under conditions when different levels of vermicompost are added.The results clearly showed that increasing the concentration of amino acid spray from 250 to 500 ppm increased the content of N, P, K, Fe, Mn, and Zn inside the roots and leaves of lettuce under any rate of vermicompost addition. Therefore, it is evident the importance of adding vermicompost in improving the growth and yield of lettuce as well as nutritional status and the effect is more distinct and significant when spraying plants with amino acids.

[ FULL TEXT PDF 10-16 ] DOI:10.22587/rjabs.2019.14.2.2