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Dispersion and optical properties of thermally deposited Se91-xTe9Px (x=0, 10) films

Research Abstract

NULL

Research Authors
H. Mahfoz Kotb, F. M. Abdel-Rahim, M. M. Hafiz
Research Department
Research Journal
Thin Solid Films, 566 (2014) pp. 54-60
Research Pages
NULL
Research Publisher
NULL
Research Rank
1
Research Vol
NULL
Research Website
NULL
Research Year
2014

MHD Convection of an Al2O3–Cu/Water Hybrid Nanofluid in an Inclined Porous Cavity with Internal Heat Generation/Absorption

Research Abstract

Publisher In Present communication, the transference of the hybrid nanofluids due to the natural propulsive like shrinkage and relaxation of the flexible walls and the motion has serious applications in several embryonic technologies. Stimulated by the multi-disciplinary development and study in this trend, a mathematical model is suggested to explore the numerical simulation of the hybrid nanofluid flow inside a slant porous cavity to determine the impact of volume fraction, Rayleigh number, heat generation and heat source length and location on magneto-free convective with entropy analysis. The governing nonlinear problem is converted into non-dimensional partial equations via suitably adjusted transformations. Successive Under-Relaxation (SUR) technique has been incorporated to find the solutions of the non-linear problem. Variation in entropy generation and heat transfer characteristic and thermal performance … Scholar articles

Research Authors
Ali J Chamkha, Taher Armaghani, Mohamed Ahmed Mansour, Ahmed Mohamed Rashad, Hadi Kargarsharifabad
Research Date
Research Department
Research Journal
Iranian Journal of Chemistry and Chemical Engineering (IJCCE) PublisherIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRDescriptionIn Present communication, the transference of the hybrid nanofluids due to
Research Pages
936-956
Research Publisher
NULL
Research Rank
1
Research Vol
41
Research Website
NULL
Research Year
2022

Zn(II) and Cd(II) thiosemicarbazones for stimulation/inhibition of kojic acid biosynthesis from Aspergillus flavus and the fungal defense behavior against the metal complexes’ excesses

Research Abstract

By increasing the undesirable side effects of synthetic food pigments on human health, using safe natural food pigment become an urgent issue. Incorporate corn starch with oils conducted a high impact on red pigment production by Monascus purpureus. Fortification the medium with sesame oil raised the pigment production by 80% and the dry mass by 63% compared with free oil medium. Response surface methodology maximizes the production with 114.6% (12.8 A500) using medium constituents (g/l); Sesame oil 5; Corn starch 30; Yeast extract 1.5; KH2PO4 2.5 and MgSO4.7H2O 0.1. After evaluating red pigment stability in three common food components, citric acid showed a great effect on residual stability percentage compared with ascorbic and salicylic acid which decrease slightly the residual stability percentage at light and dark conditions. The mitotic index of red pigment was lower than the negative control at all tested concentrations. Different types of mitotic chromosomal abnormalities e.g. lagging chromosome, chromosomal bridge, chromosome and chromatin fragments, outside chromosome, chromosomal stickiness and micro nuclei were recorded. Insignificant increase in total mitotic aberrations percentage in all tested root tips treated with all concentrations of red pigment (1.23, 1.58, 1.63, 2.32 and 2.40%) compared with negative control (0.91%). There was a significant increase in total aberrations percentage after treatment with all concentrations (10, 15, 20 and 25%) of positive control (2.93, 3.00, 3.55 and 6.53 respectively) except (5%) which was insignificant (2.71%). From the previous data, this red pigment can be used as an alternative safe pigment in the food industry.

Research Authors
1. Ghada Abd-Elmonsef Mahmoud, Ahmed B.M. Ibrahim, Peter Mayer
Research Journal
JBIC Journal of Biological Inorganic Chemistry
Research Member
Research Pages
797-809
Research Publisher
@ 2020 Springer Berlin Heidelberg
Research Rank
1
Research Vol
25
Research Website
https://link.springer.com/article/10.1007/s00775-020-01802-2
Research Year
2020

Zn(II) and Cd(II) thiosemicarbazones for stimulation/ inhibition of kojic acid biosynthesis from Aspergillus flavus and the fungal defense behavior against the metal complexes’ excesses

Research Abstract

By increasing the undesirable side effects of synthetic food pigments on human health, using safe natural food pigment become an urgent issue. Incorporate corn starch with oils conducted a high impact on red pigment production by Monascus purpureus. Fortification the medium with sesame oil raised the pigment production by 80% and the dry mass by 63% compared with free oil medium. Response surface methodology maximizes the production with 114.6% (12.8 A500) using medium constituents (g/l); Sesame oil 5; Corn starch 30; Yeast extract 1.5; KH2PO4 2.5 and MgSO4.7H2O 0.1. After evaluating red pigment stability in three common food components, citric acid showed a great effect on residual stability percentage compared with ascorbic and salicylic acid which decrease slightly the residual stability percentage at light and dark conditions. The mitotic index of red pigment was lower than the negative control at all tested concentrations. Different types of mitotic chromosomal abnormalities e.g. lagging chromosome, chromosomal bridge, chromosome and chromatin fragments, outside chromosome, chromosomal stickiness and micro nuclei were recorded. Insignificant increase in total mitotic aberrations percentage in all tested root tips treated with all concentrations of red pigment (1.23, 1.58, 1.63, 2.32 and 2.40%) compared with negative control (0.91%). There was a significant increase in total aberrations percentage after treatment with all concentrations (10, 15, 20 and 25%) of positive control (2.93, 3.00, 3.55 and 6.53 respectively) except (5%) which was insignificant (2.71%). From the previous data, this red pigment can be used as an alternative safe pigment in the food industry.

Research Authors
Ghada Abd-Elmonsef Mahmoud, Ahmed B.M. Ibrahim, Peter Mayer
Research Department
Research Journal
JBIC Journal of Biological Inorganic Chemistry
Research Pages
797-809
Research Publisher
@ 2020 Springer Berlin Heidelberg
Research Rank
1
Research Vol
25
Research Website
https://link.springer.com/article/10.1007/s00775-020-01802-2
Research Year
2020

Safe natural bio-pigment production by Monascus purpureus
using mixed carbon sources with cytotoxicity evaluation on root
tips of Allium cepa L.

Research Abstract

By increasing the undesirable side effects of
synthetic food pigments on human health, using safe natural
food pigment become an urgent issue. Incorporate corn
starch with oils conducted a high impact on red pigment
production by Monascus purpureus. Fortification the
medium with sesame oil raised the pigment production by
80% and the dry mass by 63% compared with free oil
medium. Response surface methodology maximizes the
production with 114.6% (12.8 A500) using medium constituents
(g/l); Sesame oil 5; Corn starch 30; Yeast extract
1.5; KH2PO4 2.5 and MgSO4.7H2O 0.1. After evaluating
red pigment stability in three common food components,
citric acid showed a great effect on residual stability percentage
compared with ascorbic and salicylic acid which
decrease slightly the residual stability percentage at light
and dark conditions. The mitotic index of red pigment was
lower than the negative control at all tested concentrations.
Different types of mitotic chromosomal abnormalities e.g.
lagging chromosome, chromosomal bridge, chromosome
and chromatin fragments, outside chromosome,
chromosomal stickiness and micro nuclei were recorded.
Insignificant increase in total mitotic aberrations percentage
in all tested root tips treated with all concentrations of
red pigment (1.23, 1.58, 1.63, 2.32 and 2.40%) compared
with negative control (0.91%). There was a significant
increase in total aberrations percentage after treatment with
all concentrations (10, 15, 20 and 25%) of positive control
(2.93, 3.00, 3.55 and 6.53 respectively) except (5%) which
was insignificant (2.71%). From the previous data, this red
pigment can be used as an alternative safe pigment in the
food industry.

Research Authors
Ghada Abd-Elmonsef Mahmoud - Hassan A. H. Soltan - Walid Mohamed Abdel-Aleem - Sayed A. M. Osman
Research Journal
Journal of Food Science and Technology
Research Member
Research Pages
NULL
Research Publisher
@ 2020 Springer Berlin Heidelberg
Research Rank
1
Research Vol
NULL
Research Website
https://link.springer.com/article/10.1007/s13197-020-04758-y
Research Year
2020

A cerium-based MOFzyme with multi-enzyme-like
activity for the disruption and inhibition of fungal
recolonization

Research Abstract

A cerium-based metal–organic framework (Ce-MOF, denoted as AU-1) was synthesized using a solvothermal
method by employing 4,40,400-nitrilotribenzoic acid (H3NTB) as the linker and cerium clusters as the metal
center. The material was considered as a MOFzyme based on the peroxidase-like activity of Ce-MOF
that could eliminate and kill fungi, such as Aspergillus flavus, Aspergillus niger, Aspergillus terreus,
Candida albicans, and Rhodotorula glutinis. Ce-MOF showed high antifungal activity against airborne
opportunistic human pathogens isolated from the outside of a hospital. The antifungal activity of CeMOF
was evaluated using the colony-forming units, dry mass method, soluble proteins, and microscopic
imaging. It exhibited an inhibition efficiency of 93.3–99.3% based on the colony-forming unit method.
The Ce-MOF caused extensive deformation of the conidiophores, vesicles, and phialides with growth
inhibition between 7.55–77.41% (based on the dry mass method). Ce-MOF showed different efficiencies
in inhibiting the different fungal species. The biological activity of Ce-MOF was due to its enzymatic
activity, such as those of antioxidants, catalase, superoxide dismutase, and peroxidase. Ce-MOF
exhibited excellent enzymatic activity towards the fungal cells. Our results may facilitate the design of a
MOFzyme system and pave the way for more profound applications of nanozymes.

Research Authors
Abdelhamid H. N., Ghada Abd-Elmonsef Mahmoud, Sharmoukc W.
Research Journal
Journal of Materials Chemistry B
Research Member
Research Pages
7548-7556
Research Publisher
The Royal Society of Chemistry
Research Rank
1
Research Vol
8(33)
Research Website
https://pubs.rsc.org/en/content/articlelanding/tb/2020/d0tb00894j#!divAbstract
Research Year
2020

A cerium-based MOFzyme with multi-enzyme-like
activity for the disruption and inhibition of fungal
recolonization

Research Abstract

A cerium-based metal–organic framework (Ce-MOF, denoted as AU-1) was synthesized using a solvothermal
method by employing 4,40,400-nitrilotribenzoic acid (H3NTB) as the linker and cerium clusters as the metal
center. The material was considered as a MOFzyme based on the peroxidase-like activity of Ce-MOF
that could eliminate and kill fungi, such as Aspergillus flavus, Aspergillus niger, Aspergillus terreus,
Candida albicans, and Rhodotorula glutinis. Ce-MOF showed high antifungal activity against airborne
opportunistic human pathogens isolated from the outside of a hospital. The antifungal activity of CeMOF
was evaluated using the colony-forming units, dry mass method, soluble proteins, and microscopic
imaging. It exhibited an inhibition efficiency of 93.3–99.3% based on the colony-forming unit method.
The Ce-MOF caused extensive deformation of the conidiophores, vesicles, and phialides with growth
inhibition between 7.55–77.41% (based on the dry mass method). Ce-MOF showed different efficiencies
in inhibiting the different fungal species. The biological activity of Ce-MOF was due to its enzymatic
activity, such as those of antioxidants, catalase, superoxide dismutase, and peroxidase. Ce-MOF
exhibited excellent enzymatic activity towards the fungal cells. Our results may facilitate the design of a
MOFzyme system and pave the way for more profound applications of nanozymes.

Research Authors
Abdelhamid H. N., Ghada Abd-Elmonsef Mahmoud, Sharmoukc W.
Research Department
Research Journal
Journal of Materials Chemistry B
Research Member
Research Pages
7548-7556
Research Publisher
The Royal Society of Chemistry
Research Rank
1
Research Vol
8(33)
Research Website
https://pubs.rsc.org/en/content/articlelanding/tb/2020/d0tb00894j#!divAbstract
Research Year
2020

Chemical‐vs sonochemical‐assisted synthesis of ZnO nanoparticles from a new zinc complex for improvement of carotene biosynthesis from Rhodotorula toruloides MH023518

Research Abstract

The complex [ZnL2] {HL = 2‐(((3,4‐dimethylphenyl)imino)methyl)phenol} was introduced by two routes (chemical vs. sonochemical) and acted as a source of different size zinc‐oxide (ZnO) nanoparticles (NPs) (nonsonicated ZnO NPs of Brunauer–Emmett–Teller (BET) surface area of 19.208 m2 g−1, total pore volume of 0.03493 cc g−1, and particle diameter of 20.49–114.89 nm vs. sonicated ZnO NPs of BET surface area of 38.383 m2 g−1, total pore volume of 0.08723 cc g−1 and particle diameter of 15.09–55.31 nm). The NPs generate cell stress that leads to the formation of reactive oxygen species (ROS). Consequently, carotene biosynthesis can be enhanced to overcome the ROS. Rhodotorula toruloides MH023518, genetically identified with 18S rRNA, produced carotenoids (124 ± 4.5 mg L−1) and lipids (0.897 ± 0.01 mg L−1) under no NPs' stress, but these values increased to total carotenoids of 264 ± 0.6 and 297.78 ± 0.8 mg L−1 and total lipids of 0.97 ± 0.007 and 1.096 ± 0.015 mg L−1 under stress conditions of 50 ppm of the nonsonicated and sonicated ZnO NPs, respectively. These results may represent potential industrial utilization of the as‐formed ZnO NPs (particularly the sonicated sample) as carotene and lipid stimulator. Additionally in this article, the soluble proteins, total antioxidants, and catalase and superoxide dismutase specific activities of the yeast in the presence of various concentrations of the as‐formed ZnO NPs were determined.

Research Authors
Ahmed BM Ibrahim - Ghada Abd‐Elmonsef Mahmoud
Research Journal
Applied Organometallic Chemistry
Research Member
Research Pages
e6086
Research Publisher
© 2021 John Wiley & Sons, Ltd.,
Research Rank
1
Research Vol
35
Research Website
https://onlinelibrary.wiley.com/doi/10.1002/aoc.6086
Research Year
2021

Chemical‐vs sonochemical‐assisted synthesis of ZnO nanoparticles from a new zinc complex for improvement of carotene biosynthesis from Rhodotorula toruloides MH023518

Research Abstract

The complex [ZnL2] {HL = 2‐(((3,4‐dimethylphenyl)imino)methyl)phenol} was introduced by two routes (chemical vs. sonochemical) and acted as a source of different size zinc‐oxide (ZnO) nanoparticles (NPs) (nonsonicated ZnO NPs of Brunauer–Emmett–Teller (BET) surface area of 19.208 m2 g−1, total pore volume of 0.03493 cc g−1, and particle diameter of 20.49–114.89 nm vs. sonicated ZnO NPs of BET surface area of 38.383 m2 g−1, total pore volume of 0.08723 cc g−1 and particle diameter of 15.09–55.31 nm). The NPs generate cell stress that leads to the formation of reactive oxygen species (ROS). Consequently, carotene biosynthesis can be enhanced to overcome the ROS. Rhodotorula toruloides MH023518, genetically identified with 18S rRNA, produced carotenoids (124 ± 4.5 mg L−1) and lipids (0.897 ± 0.01 mg L−1) under no NPs' stress, but these values increased to total carotenoids of 264 ± 0.6 and 297.78 ± 0.8 mg L−1 and total lipids of 0.97 ± 0.007 and 1.096 ± 0.015 mg L−1 under stress conditions of 50 ppm of the nonsonicated and sonicated ZnO NPs, respectively. These results may represent potential industrial utilization of the as‐formed ZnO NPs (particularly the sonicated sample) as carotene and lipid stimulator. Additionally in this article, the soluble proteins, total antioxidants, and catalase and superoxide dismutase specific activities of the yeast in the presence of various concentrations of the as‐formed ZnO NPs were determined.

Research Authors
Ahmed BM Ibrahim - Ghada Abd‐Elmonsef Mahmoud
Research Department
Research Journal
Applied Organometallic Chemistry
Research Pages
e6086
Research Publisher
© 2021 John Wiley & Sons, Ltd.,
Research Rank
1
Research Vol
35
Research Website
https://onlinelibrary.wiley.com/doi/10.1002/aoc.6086
Research Year
2021

Graphene on single Ag nanoparticles for nanoscale and quantum applications

Research Abstract

NULL

Research Authors
Mohamed Almokhtar, Hesham Fares, Koichi Inoue, Kazuhiko Matsumoto
Research Department
Research Journal
Applied Surface Science
Research Member
Research Pages
NULL
Research Publisher
NULL
Research Rank
1
Research Vol
NULL
Research Website
NULL
Research Year
2020
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