398 research outputs found
Potentiation of raloxifene cytotoxicity against MCF-7 breast cancer cell lines via transdermal delivery and loading on self-emulsifying nanoemulsions
Purpose: To enhance raloxifene (RLX) delivery and cytotoxicity against breast cancer (MCF-7) cell lines.
Methods: This was a solubility study of RLX in different oils, surfactants, and co-surfactants. Twelve formulae were tested to reach the smallest globular size, and hydroxypropyl methylcellulose, (HPMC), and Carbopol 947 polymers were tested for formation of transdermal films. The formula with the lowest size was compared with raw RLX in diffusion studies using a Franz diffusion cell. Finally, a cytotoxicity study against MCF-7 breast cancer cell lines was conducted.
Results: The maximum solubility of RLX was in Tween 80, peppermint oil, and PEG 200; therefore, these were the main components of the 12 formulations. The release of RLX loaded on the selfnanoemulsion drug delivery system (SNEDDS) was increased 3-fold compared with raw RLX.Cytotoxicity results revealed that RLX SNEDDs decreased MCF-7 cell survival by approximately 40 %, compared with raw RLX (control), which augmented the RLX suppression of breast cancer cell lines.
Conclusion: Improvement in RLX cytotoxicity is a novel strategy to suppress breast cancer.
Keywords: Raloxifene, Osteoporosis, Bioavailability, Nanoemulsion, Nanoparticle
Investigation of sediment accumulation in Nubia Lake, using RS/GIS
The main focus of this paper is to detect the changes in AHDL bed surface (sedimentation and erosion) in the period 2000-2012 in the active sedimentation zone of the Lake which is located in Nubia Lake (Sudanese part of AHDL). To enable this detection, the remote sensing (RS) and (Geographic Information Systems) GIS techniques are used to build the 3-D profile of the Lake portion where most of the sediment accumulate. Also, the accumulated sediment during this period is computed using the developed 3-D profile and using the cross section method as conducted by Aswan High Dam Authority (AHDA). Also, the surface areas of sedimentation and erosion are mapped and computed. Results indicated that sedimentation are dominant in years with high flood while erosion occurs when the incoming flow to the lake is low. Moreover, results indicate that the present approach overestimate the sedimentation amount by about 4% compared to the results of the method used by AHDA
Modelling of a novel Stand-Alone, Solar Driven Agriculture Greenhouse Integrated With Photo Voltaic /Thermal (PV/T) Panels
This is the author accepted manuscriptThis paper presents an analytical study of a new stand-alone agriculture greenhouse (GH) system. This system utilizes the excess solar radiation (more than that required by the plants for photosynthetic process) to generate electricity via a set of Photo Voltaic/Thermal (PV/T) units which are placed on the GH roof and south side. In addition to electricity generation, PV/Ts reduce the cooling load of the GH and help the system to be naturally ventilated. The system recovers the GH air humidity, including the plants transpiration, and uses it as irrigating water. Two coupled mathematical models are developed using MATLAB. The first model calculates the absorbed and transmitted solar radiation by/through each GH surface for a Clear Sky Day. The results of the first model are used as inputs to the second one that predicts the GH performance (GH surfaces and air temperatures, air relative humidity, air velocity, water production, electricity production and power consumption). These models are applied on climate conditions of Zagazig city, Sharqia, Egypt. The results show that the system presents a good solution for water shortage in Egypt as it has the ability to provide suitable climate conditions for plant growth (high quality and quantity) and produce enough water for irrigation purposes.British CouncilScience & Technology Development Fund (STDF), Egyp
A stand-alone Zero-Liquid-Discharge greenhouse model with rainwater harvesting capability
This is the author accepted manuscriptGlobal warming is a prevalent topic throughout the world. The IPCC predicts that the maximum potential global temperature increase will be 4.8 oC by 2100. It has been concluded that a temperature rise of 1.4 oC or higher will have statistically significant impacts on global precipitation levels. Therefore, there is a need to investigate the future trends of precipitation and subsequent irrigation methods. This study will discuss a new multi-functional zero liquid discharge (ZLD) system for a greenhouse, incorporating a humidification dehumidification (HDH) mechanism, solar still desalination and rainwater harvesting. The focus of this paper is on analysing the water production of the system. Although previous literature discusses the inefficiency of solar still (SS) desalination, the fresh water produced during similar experiments has shown otherwise, desalinating 0.95 L/m²/hr of saline water. Using multiple panels could therefore give a substantial output of distilled water for certain usage such as agriculture. Implementing solar stills of large surface area would also allow the collection of rainwater thus increasing the total water productivity of the system. The ZLD system aims to produce no waste product and use the output brine water for aquaculture and salt cultivation.British CouncilScience & Technology Development Fund (STDF), Egyp
Availability and Feasibility of Water Desalination as Non-conventional Resource for Agricultural Irrigation in the MENA Region: A review
This is the final version. Available on open access from MDPI via the DOI in this recordMany countries in the MENA region (Middle East and North Africa) are facing water scarcity, which poses a great challenge to agricultural production. Furthermore, water scarcity is projected to increase due to climate change, particularly in arid and semi-arid regions. The integration of solar power and water desalination systems in greenhouses to overcome water shortages is one of the preferred technologies in crop-growing areas. Crop growth control is done through sufficient management of environmental climatic variables as well as the quantity and quality of water and applied fertilisers with irrigation. Numerous crops such as cucumbers, tomatoes, peppers, lettuces, strawberries, flowers, and herbs can be grown under greenhouse conditions using desalinated water. This paper displays the state of the art in (i) solar-driven saltwater desalination to irrigate crops, (ii) the feasibility of water desalination for agriculture in the MENA region, (iii) the economics and environmental impacts of the desalination process, (iv) the quality of desalinated water compared with other non-conventional water resources and (v) recommendations for the future in the MENA region.Science, Technology, and Innovation Funding Authority (STIFA) of EgyptBritish Counci
Analysing greenhouse ventilation using Computational Fluid Dynamics (CFD)
This is the author accepted manuscript. The final version is available from UKACM via the link in this recordGreenhouses (GH) are used to shield the crops from excessive cold or heat. They are used for growing certain
types of cultivations during the year round. The aim of this study is to design a greenhouse using solar-powered
technology to produce a Zero-Liquid-Discharge (ZLD) by using Solar Stills and adding condensers to dehumidify
the excess vapoured water. This allows to have small-scale plants to reduce the cost of water treatment while
increasing its sustainability. Computational fluid dynamics was used to find the best locations for the dehumidifiers
in the GH and design the necessary ventilation. This can help to plan ahead and evaluate the optimal amount of
produced water for different sizes of greenhouse before they are constructed physically.British Council - EgyptScience & Technology Development Fund (STDF), Egyp
A novel stand-alone solar-powered agriculture greenhouse-desalination system; increasing sustainability and efficiency of greenhouses
This is the author accepted manuscript.The countries in the Middle East and North Africa
(MENA) region are suffering from the scarcity of
freshwater resources. With the economic development and
population growth, planning the additional water supplies
is critical for this region. Desalination of saline water is,
therefore, considered as a strategic alternative water
resources and technology to be adopted in MENA region.
On the other hand, open field agriculture in such
conditions is not economical particularly with high
ambient temperature and solar intensity. Agriculture
Greenhouses (GH) present a suitable alternative for
different plants growth for the region’s desert. In most
cases GHs can reduce about 90% of irrigating water
demand compared open field. With the available high
solar energy, integration of solar – GH – desalination
presents a real challenge and is the field of newly funded
N-M R&D proposal.
This paper presents an integration of solar energy,
agriculture GH and suitable desalination processes
targeting the development and pilot testing of a novel
stand-alone system that grows its energy and irrigation
water demand.British CouncilScience & Technology Development Fund (STDF), Egyp
Decarbonisation using hybrid energy solution: case study of Zagazig, Egypt
This is the final version. Available on open access from the publisher via the DOI in this record.In this study, an analysis is carried out to determine the optimal application of multiple
renewable energy resources, namely wind and solar, to provide electricity requirements for green
smart cities and environments. This was done to determine the potential of renewable energy to
provide clean, economically viable energy for the case study of Zagazig, located at 30â—¦340 N 31â—¦300 E
in the North East of Egypt. The relevant data surrounding the production of energy were collected,
including the meteorological data from NASA, and specifications regarding renewable resources
including solar panels, wind turbines, and storage batteries. Then a hybrid model was constructed
consisting of Photovoltaics (PV) panels, wind turbines, a converter, and storage batteries. Once the
model was constructed, meteorological data were added alongside average daily demand and cost of
electricity per kWh. The optimal solution for Zagazig consisted of 181,000 kW of solar panels feeding
directly into the grid. This system had the lowest Net Present Cost (NPC) of the simulations run of
US$1,361,029,000 and a net reduction of 156,355 tonnes of CO2 per year.British CouncilScience, Technology, and Innovation Funding Authority (STIFA) of Egyp
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