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Maria Yousaf Lodhi,Khalid Mahmood,Azhar Mahmood,Huma Malik,Muhammad Farooq Warsi,Imran Shakir,M. Asghar,Muhammad Azhar Khan 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this work cobalt substituted magnesium zinc nanocrystalline spinel ferrites having general formula Mg0.5CoxZn0.5xFe2O4 where x ¼ 0.1, 0.2, 0.3, 0.4, 0.5 were synthesized using micro-emulsion technique. The Co substituted samples annealed at 700 C and characterized by various characterization techniques, such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dielectric measurements and vibrating sample magnetometer (VSM). XRD analysis confirmed single phase spinel structure and the crystalline size calculated by Scherrer’s formula found to be in 21.38e45.5 nm range. The lattice constant decreases as substitution of Co is increased. The decrease in lattice constant is attributed to the smaller ionic radius of cobalt as compared to zinc ion. The FTIR spectra reveled two prominent frequency bands in the wave number range 400e600 cm1 which confirm the cubic spinel structure and completion of chemical reaction. The dielectric parameters were observed to decrease with the increased Co contents. The peaking behavior was observed beyond 1.8 GHz. The frequency dependent dielectric properties of all these nanomaterials have been explained qualitatively in accordance with Koop’s phenomenological theory. Magnetic studies revealed that the coercivity (Hc) attains maximum value of 818 Oe at w21 nm. The increasing trend of magnetic parameters (coercivity and retentivity) is consistent with crystallinity. The crystallite size is small enough to attain considerable signal to noise ratio in high density recording media. The optimized magnetic parameters suggest that the material with composition Mg0.5Co0.5Fe2O4 may have potential applications in high density recording media.
Khan Hafiz Azhar Ali,Maqsood Sumaira,Mahmood Anas 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Management of Musca domestica is desirable globally in order to manage public health issues. However, development of insecticide resistance is one of major hindrances in the management of M. domestica. Here, we explored toxicity of permethrin against larvae of laboratory and field strains of M. domestica, resistance com parison, synergistic effect of enzyme inhibitors on permethrin toxicity, and activities of metabolic enzymes in both strains. In case of the Lab-susceptible strain, LC 50 values of permethrin were 0.14, 0.52 and 0.94 µg g − 1 for first, second and third instars, respectively. In case of the field strain, LC 50 values were 28.09, 66.86 and 112.24 µg g − 1 for first, second and third instars, respectively. First, second and third instars of the field strain exhibited 200.64, 128.58 and 119.40 fold resistance to permethrin when compared with the first, second and third instars of the Lab-susceptible strain, respectively. Toxicity of permethrin in the field strain synergized in the presence of enzyme inhibitors (PBO or DEF). Enzyme analysis revealed significantly higher activities of MFO, CarE and GST in the field strain than those of the Lab-susceptible strain, suggesting metabolic-based mechanism of permethrin resistance. In conclusion, the field strain exhibited resistance to permethrin, which could be managed by adopting alternate measures for the management of M. domestica.
Flavonoid Glycosides from Prunus armeniaca and the Antibacterial Activity of a Crude Extract
Rashid, Fahima,Mahmood, Azhar,Ahmad, Zaheer,Bibi, Nazia,Kazmi, Shahana Urooj,Ahmed, Rehana 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.8
Investigations on the chemical constituents of the fruits of Prunus armeniaca have led to the isolation of two new flavonoid glycosides, 4',5,7-trihydroxy $flavone-7-O-[{\beta}-D-mannopyranosyl(1'{\rightarrow}2')]-{\beta}-D-allopyranoside$ (1) and 3,4',5,7-tetrahydroxy-3',5'-di-methoxy flavone $3-O-[{\alpha}-L-rhamnopyranosyl(1'{\rightarrow}6')]-{\beta}-D-galactopyranoside$ (2), from the butanolic fraction of the fruits. The butanolic extract exhibited antibacterial activity against both Gram positive and Gram negative bacteria. The structures of these compounds were elucidated through spectral studies, including 2D-NMR (COSY, NOESY, J-resolved), HMQC and HMBC experiments.
Purunusides A-C, α-Glucosidase Inhibitory Homoisoflavone Glucosides from Prunus domestica
Shaheen Kosar,Itrat Fatima,Azhar Mahmood,Rehana Ahmed,Abdul Malik,Muhammad Iqbal Chouhdary,Sumaira Talib 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.12
Purunusides A-C (1-3), new homoisoflavone glucosides together with the known compounds β-sitosterol (4) and 6,7-methylenedioxy-8-methoxycoumarin (5) have been isolated from nbutanol and ethyl acetate soluble fractions of Prunus domestica. Their structures were assigned on the basis of spectral studies. The compounds 1-3 showed potent inhibitory activity against the enzyme α-glucosidase.
Flavonoid Glycosides from Prunus armeniaca and the Antibacterial Activity of a Crude Extract
Fahima Rashid,Rehana Ahmed,Azhar Mahmood,Zaheer Ahmad,Nazia Bibi,Shahana Urooj Kazmi 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.8
Investigations on the chemical constituents of the fruits of Prunus armeniaca have led to the isolation of two new flavonoid glycosides, 4',5,7-trihydroxy flavone-7-O-[β-D-mannopyranosyl (1'''→2'')]-β-D-allopyranoside (1) and 3,4',5,7-tetrahydroxy-3',5'-di-methoxy flavone 3-O-[α-Lrhamnopyranosyl (1'''→6'')]-β-D-galactopyranoside (2), from the butanolic fraction of the fruits. The butanolic extract exhibited antibacterial activity against both Gram positive and Gram negative bacteria. The structures of these compounds were elucidated through spectral studies, including 2D-NMR (COSY, NOESY, J-resolved), HMQC and HMBC experiments.
WSN Missing Data Imputing Based on Multiple Time Granularity
Jianfeng Xu,Yu Li,Yuanjian Zhang,Azhar Mahmood 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.6
Missing data is a common phenomenon in the data collection process of wireless sensor network (WSN), and the missing data imputing is an important issue of WSN stream data mining. Currently WSN missing data imputing method has little considered about the dynamic characteristics of internal data time structure during the data collection process, which makes data imputing difficult to reflect the real monitoring change objectively. In order to analyze the internal structure and dynamics of WSN time sequence data systematically, with the equivalence relation of the monitored object the time domain can be regarded as a series of integral time granule (ie atomic time point set), a wireless sensor network timing information system (WTIS) is established. The system can reason logically at different time granularity, and a multiple optimal time granularity strategy of WTIS based on hierarchical successive approximation approach is proposed. Finally, based on the research, a multiple optimal time granularity WSN missing data clustering imputing algorithm is proposed. Compared with traditional fixed time granularity missing data imputing algorithm, experiments show that the algorithm can lower error rate when imputing WSN missing data.
Iqra Ghulam Rasool,Muhammad Yasir Zahoor,Muhammad Iqbal,Aftab Ahmad Anjum,Fatima Ashraf,Hafiz Qamar Abbas,Hafiz Muhammad Azhar Baig,Tariq Mahmood,Wasim Shehzad 한국유전학회 2021 Genes & Genomics Vol.43 No.5
Background Intellectual disability (ID) is a heterogeneous disorder afecting 1–3% of the population. Elucidation of monogenic variants for ID is a current challenge. These variants can be better demonstrated in consanguineous afected families. Objective The study was designed to fnd the genetic variants of ID in consanguineous families. Methods We analyzed fve unrelated consanguineous Pakistani families afected with ID using whole exome sequencing (WES). Data was analyzed using diferent bioinformatics tools and software. Results We mapped four variants including three novels in four diferent ID known genes. Each variant is found in a different family, co-segregating with a recessive pattern of inheritance. The novel variants found are; c. 2_4del (p.?) mapped in ROS1 and c. 718G>A (p.Gly240Arg) in GRM1. Another novel causative variant, c.2673del (p.Gly892Aspfs*17) identifed in COL18A1 in a recessive form, a gene reported for Knobloch syndrome that manifests ID along with typical retinal abnormalities, and this phenotype was confrmed on reverse phenotyping. A mutation c.2134C>T (p.Arg712*) in TRAPPC9 has been found frst time in the homozygous recessive form in our enrolled three afected siblings while it was previously reported in compound heterozygous form in a Caucasian descent. While ffth family remained unsolved. Conclusion These mutations in four diferent genes with a recessive inheritance would be a contribution to the disease variant database of this devastating disorder.