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- 검색키워드
- 저자 : Azeem Ullah (검색결과 4 건)
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Azeem Ullah,Ick Soo Kim 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Essential oil from Ngai camphor plant was successfully incorporated into cellulose acetate nanofibers using a horizontal electrospinning setup. SEM micrographs confirms bead free continuous nanofiber production. The incorporation of essential oil increased the nanofiber diameter. FTIR spectra confirm the encapsulation of the essential oil in the nanofibers. XRD diffractogram suggests a decrease in the peak intensity of the cellulose acetate which can be associated with the shifting of the hydrogen bonds in the polymer chains upon inclusion of the essential oil. The essential oil loaded nanofibers were effective against the Gram negative (E. coli) and gram positive (S. aureus). The essential oil loaded nanofibers showed excellent biocompatibility when incubated with NIH3T3 cell line. The nanofibers showed weak antioxidant activity. The essential oil showed a bi-phasic release profile and followed first-order kinetics.
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Azeem Ullah,Sana Ullah,Tanzeel Areeb,Muhammad Umar,Phan Duy Nam,Rashid Masood,Soonjee Park,김익수 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
Polysaccharides from different sources have found their applications in the wound care for their inherent abilitiesof gelling, biocompatibility, biodegradability, and antibacterial activity. Considering the low cost, ease of processing,abundance in nature and therapeutic benefits of the polysaccharides we developed psyllium, alginate and chitosan (PAC)composite fibers and modelled their physical properties namely; tenacity, linear density and absorption in both distilled waterand saline solution; using Box-Behnken (BB) technique of Response Surface Methodology (RSM). The PAC fibers wereproduced using an in house developed wet spinning module; briefly the dope solutions containing psyllium and alginate wereextruded into a hydrolyzed chitosan and CaCl2. The produced fibers were acetone washed to remove the polar solvent; in thiscase water; and later dried in air. The present work aimed at the development of statistical models for physical properties:linear density, tenacity, antibacterial efficacy and liquid absorption; of the composite PAC fibers. The factors underconsideration were the raw material concentration namely; alginate and psyllium in dope solution and calcium chloride(CaCl2) and hydrolysed chitosan in the coagulation bath. The experimental work was designed and analyzed using Minitab®17 statistical software. Regression models using the under consideration factors were successfully developed.
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Azeem Umair,Younis Hannan,ullah Niamat,Mehboob Khurram,Ajaz Muhammad,Ali Mushtaq,Hidayat Abdullah,Muhammad Wazir 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.1
This study focuses on measuring the levels of naturally occurring radioactivity in the soil of Swabi, Khyber Pakhtunkhwa, Pakistan, as well as the associated health hazard. Thirty (30) soil samples were collected from various locations and analyzed for 226Ra, 232Th, and 40K radioactivity levels using a High Purity Germanium detector (HPGe) gamma-ray spectrometer with a photo-peak efficiency of approximately 52.3%. The average values obtained for these radionuclides are 35.6 ± 5.7 Bqkg 1, 47 ± 12.5 Bqkg 1, and 877 ± 153 Bqkg 1, respectively. The level of 232Th is slightly higher and 40K is 2.2 times higher than the internationally recommended limit of 30 Bqkg 1 and 400 Bqkg 1, respectively. Various parameters were calculated based on the results obtained, including Radium Equivalent (Raeq), External Hazard (Hex), Absorbed Dose Rate (D), Annual Gonadal Equivalent Dose (AGDE), Annual Effective Dose Rate, and Excess Lifetime Cancer Risk (ELCR), which are 170.3 ± 24 Bqkg 1, 0.46 ± 0.06 Bqkg 1, 81.4 ± 2.04 nGy h 1, 582 ± 78.08 μSvy 1, 99.8 ± 13.5 μSv Gy 1, and 0.349 ± 0.04, respectively. These values are below the limits recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) in 2002. This study highlights the potential radiation threats associated with natural radioactivity levels in the soil of Swabi and provides valuable information for public health and safety
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Biocompatibility of cobalt iron oxide magnetic nanoparticles in male rabbits
Furhan Iqbal,Tanveer Ahmad Tabish,Muhammad Naeem Ashiq,Muhammad Azeem Ullah,Shahid Iqbal,Muhammad Latif,Muhammad Ali,Muhammad Fahad Ehsan 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7
Present study was conducted to study the in vivo biocompatibility of cobalt iron oxide magnetic nano-particles (CoFe2O4 MNPs) in rabbits. CoFe2O4 MNPs were synthesized by the conventional micro emulsion technique in crystallite size range of 30 to 50 nm. The lattice constant (a) and cell volume were found to be 8.386 Å and 589.75 Å3, respectively, revealed by XRD. Subject animals were divided in three groups--low dose, high dose and control group without nanoparticles implantation for biocompatibility evaluation. CoFe2O4 was intraperitoneally implanted in rabbits: low dose (1mg CoFe2O4/Kg body weight) and high dose (10mg CoFe2O4/Kg body weight). Blood, serum and histological study of vital organs (liver, heart, kidney and spleen) were carried out in seven days of time protocol after sacrificing of animals. Results indicated that CoFe2O4 had drastically affected the blood chemistry in a dose-dependent manner as RDWa (P=0.01), Platelet (P<0.001) and Plateletcrit (P<0.001) concentrations reduced significantly in low dose and high dose CoFe2O4 treatments as compared to sham treated control group. Histological analysis revealed that CoFe2O4 exposure resulted in disordered and abnormal histology of liver, kidney and that of muscles at surgical site. It is concluded that CoFe2O4 has low biocompatibility and higher toxicity levels in living system at the applied doses.
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