Nano fertilizers have become a very important approach in agriculture research nowadays. In this paper we investigate the effect of chitosan nanoparticles loaded with nitrogen on onion plants using foliar application . Chitosan-N nanoparticles were easily applied to leaf surfaces and absorbed to take pathway to plant organs, avoiding direct interaction with soil systems. The levels of chitosan N 15% (0.5, 0.1 and 1.5 gm / L) were investigated. The results revealed that nano particles. Results showed significant differences among some characters comparing with the control The application of recommended dose of chemical nitrogen surpassed all treatments of chitosan or chitosan with nitrogen in growth characters and yield and its components .It is worth to note that application of chitosan with 15% nano nitrogen gradually increased most of the growth , yield and its attributes and chemical compassion of onion plants , where the maximum dose ChN 1 achieved the maximum values of all characters and recorded the second rank after application of recommended dose of nitrogen.

The study was carried out during the two successive seasons of 2013/14 and 2014/15 at the farm of environmental studies and research institute -Sadat City University Menofiya Governorate, Egypt to study the the effect of nano particles of chitosan and chitosan with 15% nano nitrogen on growth , yield, quality of faba bean.Significant differences were found among all treatments and control, where application of recommended dose of normal nitrogen surpassed control and all other treatments and produced the maximum values of plant height, number of leaves and branches , plant fresh weight and plant dry weightThe same trend was found concerning seed yield and its attributes , where application of recommended dose of normal nitrogen produced the maximum values of all characters ie number of pods /plant, number of seeds/pod , seed index , total weight of plant , pod weight of plant , seed yield /plant and per feddan and strow yield per plant and per feddan with significant differences with control and other chitosan 15% nano nitrogen It is worthy to note that application of chitosan with 15% nano nitrogen caused increasing in all these traits reached to be near to the values of normal fertilization .Concerning the chemical composition of faba bean leaves and seeds , control recorded the lowest values of NPK composition . while fertilization with normal nitrogen with recommended dose recorded the greatest vales . Gradually increases were found doe to increasing nano nitrogen up to 1.5 g / L which achieved the second rank of most values of characters .

Background: Magnetite is the most recognized iron oxide candidate used for various biological applications. Objective: This work is a complete study that addresses the synthesis of magnetic nanoparticles and investigates the feasibility of using green tea and ascorbic acid as capping agents. Methods: Synthesis of magnetite by two wet chemical methods namely: coprecipitation and solvothermal methods. The samples were characterized using X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). Results: The results reveal the impact of coating on the size and morphology of the particles. The study also proves that autoclaving the samples prepared by coprecipitation results in smaller particle size and narrower size distribution due to digestive ripening. In addition, a novel and facile methodology for coating magnetite with polyethylene glycol is presented. The potential of the particles to be used for magnetic fluid hyperthermia is assessed by measuring the specific absorption rate (SAR) of the samples. Conclusión: The results show that all the prepared magnetite samples showed a promising capacity to be used as magnetic fluid hyperthermia agents.

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