Islamic Azad University

About: Islamic Azad University is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Population & Adsorption. The organization has 83635 authors who have published 113437 publications receiving 1275049 citations. The organization is also known as: Azad University.

Carbon quantum dots supported AgI /ZnO/phosphorus doped graphitic carbon nitride as Z-scheme photocatalyst for efficient photodegradation of 2, 4-dinitrophenol

Abstract: The unique attributes of CQDs, such as low cost, facile synthesis, tremendous photochemical, and physicochemical stability, render them as versatile nanocomposites, as compared to conventional semiconductors. Herein, a green synthesis approach was opted using naturally occurring bamboo leaves as precursors for CQDs production via a facile and efficient hydrothermal method. The fabricated CQDs were exploited for construction of Z-scheme P-doped g-C 3 N 4 /AgI/ZnO/CQDs (PGCN) heterojunction by immobilizing AgI/ZnO/CQD on graphitic carbon nitride (g-C 3 N 4 ), that acts as support targeted for 2, 4-dinitrophenol (DNP) eradication from simulated wastewater. TEM image depicts the presence of different fringes on an agglomerated structure which confirms the formation of nanocrystalline heterostructure. XRD, XPS, FT-IR, and EDX were used to provide structural, morphological information of synthesized samples relating the existence of heterostructure between AgI and ZnO/CQDs with the sheet-like structured g-C 3 N 4 which have undergone successful inclusion of P dopant into g-C 3 N 4 framework. Congruously, the optical properties of modified photocatalyst with suppression in photogenerated electron-hole pair recombination g-C 3 N 4 /AgI/ZnO/CQD nanostructure were evidenced by photoluminescence (PL) spectra and UV–Vis diffused reflection spectra (UV–Vis DRS). Synergistic process of adsorption and photocatalysis was effectual for complete mineralization of DNP into CO 2 , H 2 O, and inorganic ions. The integration of g-C 3 N 4 to AgI/ZnO with CQDs accelerated photocatalytic activity attributed to electron sink behavior of CQDs. The fabricated Z-scheme P-doped g-C 3 N 4 /AgI/ZnO/CQDs photocatalyst exhibited remarkable stability and recyclability for ten consecutive catalytic cycles.

Effect of Drought Stress and its Mechanism in Plants

Abstract: Drought is the most important abiotic factor limiting growth, adversely affect growth and crop production. Stresses, resulting in the non-normal physiological processes that influence one or a combination of biological and environmental factors. Stress can damage which has occurred as a result of an abnormal metabolism and may reduce growth, plant death or the death of the plant develops. Production is limited by environmental stresses, according to different scholars estimates, only 10 percent of the world's arable land is free from Stress, in general, a major factor in the difference between yield and potential performance, environmental stresses. Drought and stress is the most common environmental stresses that almost 25 percent of agricultural lands for agricultural farm products in the world is limited. Drought risk to successful production of crops worldwide and occurs when a combination of physical and environmental factors causing stress in plants and thus reduce production. International Journal of Life Sciences 10 (1) : 2016; 1-6

The role of hypoxia in the tumor microenvironment and development of cancer stem cell: a novel approach to developing treatment.

Abstract: Hypoxia is a common feature of solid tumors, and develops because of the rapid growth of the tumor that outstrips the oxygen supply, and impaired blood flow due to the formation of abnormal blood vessels supplying the tumor. It has been reported that tumor hypoxia can: activate angiogenesis, thereby enhancing invasiveness and risk of metastasis; increase survival of tumor, as well as suppress anti-tumor immunity and hamper the therapeutic response. Hypoxia mediates these effects by several potential mechanisms: altering gene expression, the activation of oncogenes, inactivation of suppressor genes, reducing genomic stability and clonal selection. We have reviewed the effects of hypoxia on tumor biology and the possible strategiesto manage the hypoxic tumor microenvironment (TME), highlighting the potential use of cancer stem cells in tumor treatment.