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    Comparison of kinetic biodegradation of potato starch based and corn starch based low density polyethylene compound in aerated sludge

    , Article BioTechnology: An Indian Journal ; Volume 7, Issue 5 , 2013 , Pages 163-168 ; 09747435 (ISSN) Borghei, M ; Khoramnejadian, S ; Hejazi, B ; Sharif University of Technology
    The biodegradability rates of two different kinds of polyethylene bonded with corn and potato starch are studied in this paper. While it is usual to use soil as the environment for biodegradation, an aerated sludge tank was used in this studywhich offers a richermicrobialmediumand increases the rate of biodegradation. The biodegradability is determined by two ways: first, comparing differences in the weight change of two samples, one placed inside distilled water and the other placed in aerated sludge tank. Second test for biodegradation is by examination of FTIR spectroscopy. Through FTIR spectroscopy, the biodegradability rate and reduction in some of the existing bonds in polymer before... 

    Surfactant effects on the particle size, zeta potential, and stability of starch nanoparticles and their use in a pH-responsive manner

    , Article Cellulose ; Volume 24, Issue 10 , 2017 , Pages 4217-4234 ; 09690239 (ISSN) Masoudipour, E ; Kashanian, S ; Hemati Azandaryani, A ; Omidfar, K ; Bazyar, E ; Sharif University of Technology
    Storage conditions seem to be important in the long-term stability of nanoparticles (NPs). This work studies the effects of surfactants and storage container on particle size distribution and zeta potential during long-term storage of acid hydrolyzed potato starch NPs. The NPs were prepared from potato starch using acid hydrolysis and high-intensity ultrasonication. During the ultrasonic treatment, the surfactants were added dropwise to the solutions to reduce the size and stabilize the formed NPs. Particle size distribution, zeta potential, and FE-SEM were used to characterize the ensuing NPs. Additionally, a 5-month stability study was performed to evaluate the maintenance of potato starch... 

    Plant hormones as signals in arbuscular mycorrhizal symbiosis

    , Article Critical Reviews in Biotechnology ; Vol. 34, issue. 2 , 2014 , p. 123-133 Miransari, M ; Abrishamchi, A ; Khoshbakht, K ; Niknam, V ; Sharif University of Technology
    Arbuscular mycorrhizal (AM) fungi are non-specific symbionts developing mutual and beneficial symbiosis with most terrestrial plants. Because of the obligatory nature of the symbiosis, the presence of the host plant during the onset and proceeding of symbiosis is necessary. However, AM fungal spores are able to germinate in the absence of the host plant. The fungi detect the presence of the host plant through some signal communications. Among the signal molecules, which can affect mycorrhizal symbiosis are plant hormones, which may positively or adversely affect the symbiosis. In this review article, some of the most recent findings regarding the signaling effects of plant hormones, on... 

    Effect of slow biodegradable substrate addition on biofilm structure and reactor performance in two MBBRs filled with different support media

    , Article Environmental Technology (United Kingdom) ; Volume 41, Issue 21 , 2020 , Pages 2750-2759 Ashrafi, E ; Allahyari, E ; Torresi, E ; Andersen, H. R ; Sharif University of Technology
    Taylor and Francis Ltd  2020
    In this study, two moving-bed biofilm reactors (MBBR1 and MBBR2) filled with different size of carrier media (Kaldnes K1 and Kaldnes K1 micro, respectively) were subjected to soluble (sugar and sodium acetate (Ac)) substrate and mixture of soluble and particulate (particulate potato starch (PS)) substrate in a very high organic loading rate (12 kgCOD/m3·d) at different temperatures (26 and 15°C, in MBBR1 and MBBR2, respectively). The effects of carrier type and substrate on biofilm structure and reactor performance have been studied. Starch was removed by adsorption at the biofilm surface and hydrolyzed which caused substrate gradient in MBBR1, however, hydrolyzed uniformly within biofilm in...