الفهرس 
INFLUENCE OF EXPOSURE TO WATER TREATMENT RESIDUALS NANOPARTICLES ON CUCUMBER PLANT GROWTH: A PHYSIOLOGICAL PROSPECTOnly 14 pages are availabe for public view
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Abstract
The contamination of soil and water by toxic heavy metals has become a major concern to the
researcher worldwide. The main resource of heavy metals release in the environment is sewage
from different industries such as mining, electroplating, Cadmium -nickel batteries, plastic
manufacturing , melting and casting industries , pesticides, petroleum refining processes,
photography , printed circuit board manufacturing. Heavy metals, at extremely low concentrations,
can cause harmful effects towards public health and aquatic life. In particular, Cadmium (Cd2+) has
drawn great attention due to its highly carcinogenic and common use in many industrial
applications .The interactions of NPs with plants have been poorly studied, remaining unclear the
general consequences of NPs exposure for plant cells. The lack of these data leads as well to a
defective understanding of how NMs are transferred and accumulate in the various food chain
levels. The impact of nonmaterial on plants has scantly been examined in the current literature. The
current study was conducted to characterize the physical and chemical properties of nanoscale water
treatment residuals (nWTRs); to evaluate the impact of the nWTRs on physiological parameters
such as germination, root growth, enzyme content such as catalase and peroxidase, soluble protein,
and chlorophyll content in plant; and to investigate the anatomy change consequences through
plant-nWTRs interaction using electron microscope. To achieve these objectives, series of
experiments were conducted as follows:
Seed germination experiment, Experimental exposure of hydroponic media, and Influence of
nWTRs on the growth of cucumber plants in soil medium. The results revealed that:
1- The root length increased and root radius, root surface area decreased in cucumber roots when
applying of nWTR, and the opposite reactions appeared by Cd applying.
2- Root length increased positively and root surface area, root radius decreased with nWTRs
applying, but root length decreased, root surface area and root radius increased with applying Cd
concentrations.
3-In the hydroponic medium, the results showed that biomass increased by increasing nWTRs
concentration and decreased with Cd concentrations. The enzymes activity (catalase, peroxidase)
and MDA are increased in leaves and roots with increasing the Cd concentrations and were
decreasing with nWTRs concentrations. Chlorophyll content increased positively with applying
nWTRs concentrations. The N% and K% increased in shoots by applying NWTRs concentration
and decreased in roots of experiment, and on the other hand the N% and K% decreased in shoots by
applying Cd concentrations and increased in roots of experiment. The P % decreased in shoots by
applying nWTRs concentration and decreased in roots of experiment, and the P % increased in
shoots by applying Cd concentrations and increased in roots of experiment. Cd content decreased in
shoots and roots of experiment by increasing nWTRs concentrations, and increasing in shoots and
roots by increased Cd concentrations. Soluble protein increased in shoots and decreased in roots by
increasing in nWTRs concentration. The observation analysis in the root of experiment showed that
the concentration of Cd (100ppm) destroyed the cells and form of roots but the same concentration
of Cd (100ppm) with the highest concentration in nWTR (0.3 g/l) showed that the root be like the
root in the treatment of control.
4- In the soil medium, the results indicated that the biomass increased with applying Nano WTRs.