Marwa Rageh Abdulrahman Obiedallah

Lecturer - Lecturer

Faculty of science

Address: University of Sohag, Faculty of Science, Department of Botany and Microbiology, 825244.


Synthesis of silver nanooparticles using fusarium solani filtrate
There is a growing interest in biosynthesis of nanoparticles using methods that are simple, inexpensive, and non-toxic to the environment. Among the different available methods of synthesis (including physical and chemical methods), the biological methods are considered to be the most convenient in terms of cost and non-hazardous impacts to the environment. Nanoparticles are proven to possess unique chemical and ... Read more

Biosynthesis of silver nanoparticles using Aspergillus oryzae and its extracellular protein profile
The biological generation of silver nanoparticles (AgNP) is a straight forward process. However, the mechanism by which this process takes place is unclear. We demonstrate the synthesis of AgNPs using fungal filtrate of Aspergillus oryzae. A characteristic peak of AgNP formation was detected at 435 nm. Eight most prominent extracellular protein bands were identified using MALDI/TOF Mass spectrometry. Here, we ... Read more

Extracellular generation of silver nanoparticles using Fusarium solani MH005062
The mechanism of biological generation of silver nanoparticles (SNP) is still not fully understood with most studies merely providing detailed information describing the mechanism by which fungi reduce AgNO3 into SNP. In our work, we demonstrate that proteins are mainly involved in the myco-generation of SNP. Fifty-three and 27 fungal isolates were obtained from Padina (brown algae) and Avicennia marina ... Read more

Antibacterial effect of mycological synthesized silver nanoparticles using Aspergillus oryzae and Fusarium solani filtrates
In this study two novel marine fungal isolates (Aspergillus oryzae and Fsarium solani) were used for generating silver nanoparticles (SNPs). The antibacterial effect of mycological synthesized SNPs (12.31±0.26 and 22.6 ±1.2nm for A. oryzae and F. solani, respectively) was tested against Grampositive (Bacillus cereus SBTBC, Enterococcus faecalis 8J, Lesteria monocytogenes 10403S and Staphylococcus aureus 7A) and Gram-negative bacteria (Escherichia coli ... Read more

Mycogenesis of Silver Nanoparticles and their Antibacterial Effect
Mycological synthesized silver nanoparticles (SNPs) is a promising field of study and addressing the optimized conditions for this production is discussed in detail in this study. Here, we screened 80 novel fungal isolates, obtained from _Padina_ sp. (Algicolous fungi) and _Avicennia__marina_ (Forssk.) Vierh. (Foliicolous fungi) samples, for SNPs generation using fungal supernatants to identify new isolates with enhanced activity. A ... Read more

Synthesis and Biological activity of 1,3-Thiazolylidenehydrazinylidene ethylpyridiniumbromide monohydrate, 1,3- Thiazolylidenehydraziniumbromide and 1,3-Thiazolylidenehydrazine derivatives
1,3-Thiazolylidenehydrazinylidene ethylpyridinium bromide monohydrate, 1,3-thiazolylidenehydrazinium bromide and 1,3- thiazolylidenehydrazine derivatives were synthesized by heterocyclization of 2-(1-substituted ethylidene)hydrazinecarbothioamides, characterized and screened for their anti-bacterial activities. 3h showed the highest inhibitory effect against all types of bacterial compared to Moxifloxacin. The structures of synthesized compounds were established by spectroscopic (IR, 1H, 13C-NMR, Mass) and X-ray analyses. Read more

A simple technique for single spore isolation of Fusarium verticillioides and Fusarium subglutinans
An easy single spore isolation technique for Fusarium verticillioides and Fusarium subglutinans is described and illustrated. The technique depends only on, reused basic equipments, time saving and enables poorly funded laboratories to carry it out with no need to a great deal of skills to be performed. Read more

Biological and chemical detection of fumonisins produced on agar medium by Fusarium verticillioides isolates collected from corn in Sohag, Egypt.
Fusarium verticillioides (Sacc.) Nirenberg is among the most common Fusarium species corn pathogens worldwide, and has been recognized as a fumonisin B1 (FB1) and fumonisin B2 (FB2) producer. In the present work, extracts of 58 F. verticillioidesisolates from corn samples collected from Sohag Governorate, Egypt, were tested for their biotoxicity and production of fumonisin toxins. Forty-four Fusarium verticillioides isolates out ... Read more

Incidence of mycobiota and toxigenic fusaria in corn grain samples from Sohag, Egypt
A total of 41 species and one variety related to 11 genera of filamentous fungi were isolated from 80 corn grain samples. The total fungal units emerged from non-surface disinfected (NSD) corn grains were much higher than those emerged from surface disinfected (SD) corn grains. However, the number of isolated species in case of SD corn grains exceeded those in ... Read more