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排序方式: 共有96条查询结果,搜索用时 15 毫秒
11.
N. P. Bharathi Nazia Umar Khan Sheikh Shreaz Athar Adil Hashmi 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(4):558-565
Zinc containing oil based polyesteramide resins were synthesized by condensation polymerization reaction between castor/soyabean
oil derived castor/soyabean fatty amide diol (HECA/HESA), Zn (OH)2 and adipic acid. The conventional spectroscopic techniques such as FTIR, 1HNMR, 13CNMR have been used to establish the structure of the polymers. Standard laboratory methods were used to study the physicochemical
characteristics like acid value, hydroxyl value, saponification value, iodine value, specific gravity, and viscosity. The
thermal behaviour of the polymers was analyzed by using thermo gravimetric analysis (TGA) and differential scanning calorimetry
(DSC). In vitro antifungal (anticandidial) activity of the polymers was studied against C. albicans ATCC-10261, C. glabrata ATCC-90030 and C. tropicalis ATCC-750, respectively. Antibacterial activity against Gram positive (S. subtillis) and Gram negative bacteria (E. coli and S. typhi) was also examined. For more accuracy, growth curve studies were carried out with the polymer SZ showing higher biological
activity against E. coli by using conventional spectrophotometer. The result showed that the polymers have potent anticandidial and antibacterial
activities. 相似文献
12.
Athar Hussain 《Desalination》2010,250(1):35-41
Effect of nitrogen on methanogenesis of phenol has been evaluated. Methane generation rate constant (k) has been found to vary from 0.12 to 0.21 d− 1. The process was not impaired due to reduction of COD:N from 300:10 to 300:1. However, a definite decreasing trend in k was noticed at COD:N < 300:1. The µb at 90 days (µb90) was reduced from 0.94 to 0.12. Gas generation completely ceased at COD:N equal to 300:0. The trend of sludge activity was also found to be similar to that of k and µb90. The variation of COD:N from 300:1 to 300:0 in a UASB reactor, did influence the conversion of phenol COD to methane COD i.e. the (i) CH4-COD decreased from 90 to 40%, and (ii) cell yield reduced to 25-50%. The average cell yield was 3.5%. Percent N in cells varied from 10 to 14%. The activity of the sludge assessed as SMA was found in the range from 0.15 to 0.66 g CH4-COD/g VSS/d. The optimum COD:N for phenolic wastewater from both bench-scale batch and continuous reactor study has been estimated to be 300:1. 相似文献
13.
14.
Biofilm-based systems, including integrated fixed-film activated sludge and moving bed bioreactors, are becoming increasingly popular for wastewater treatment, often with the goal of improving nitrification through the enrichment of ammonia and nitrite oxidizing bacteria. We have previously demonstrated the utility of self-assembled monolayers (SAMs) as tools for studying the initial attachment of bacteria to substrata systematically varying in physicochemical properties. In this work, we expanded these studies to bacteria of importance in wastewater treatment systems and we demonstrated attachment rates were better correlated with surface energy than with wettability (water contact angle). Toward the long-term goal of improving wastewater treatment performance through the strategic design of attachment substrata, the attachment rates of two autotrophic ammonia-oxidizing bacteria (Nitrosomonas europaea and Nitrosospira multiformis) and a heterotroph (Escherichia coli) were evaluated using SAMs with a range of wettabilities, surface energies, and functional properties (methyl, hydroxyl, carboxyl, trimethylamine, and amine terminated). Cell attachment rates were somewhat correlated with the water contact angles of the SAMs with polar terminal groups (hydroxyl, carboxyl, trimethylamine, and amine). Including all SAM surfaces, a better correlation was found for all bacteria between attachment rates and surface free energy, as determined using the Lewis Acid-Base approach. The ammonia-oxidizers had higher adhesion rates on the SAMs with higher surface energies than did the heterotroph. This work demonstrated the successful application of SAMs to determine the attachment surface preferences of bacteria important to wastewater treatment, and it provides guidance for a new area of research aimed at improving treatment performance through rational attachment surface design. 相似文献
15.
Oxidative stress in a tissue activates phospholipase A2 which releases free arachidonic acid. In addition, a low grade oxidative tone also stimulates the tissue cyclooxygenase activity. Cyclooxygenase-dependent arachidonic acid metabolites such as PGF 2 alpha are known to play an important role in the development and maintenance of hyperplasia in skin in response to the application of tumor promoters. In this study we show that Fe-NTA, an oxidant renal tumor promoter induces PGF 2 alpha which was maximum at 12 hours after Fe-NTA treatment. However, at all time points studied, the elevated levels of PGF 2 alpha have been observed. As a result of the induction of PGF 2 alpha, the hyperplastic response can also be observed in the histopathology of the tissue. Additionally, an increased incorporation of [3H]thymidine in renal DNA has also been observed. Pretreatment of animals with indomethacin suppresses Fe-NTA-mediated hyperproliferation suggesting a role of cyclooxygenase in Fe-NTA-mediated stimulation of hyperplastic activity. The pretreatment of animals with the chain breaking antioxidants, Vit. E, BHA and BHT were only partially effective in inhibiting Fe-NTA-mediated PGF2 alpha production, further suggesting a role of non-free radical-dependent mechanism in its production. Our data suggest that Fe-NTA-induced PGF2 alpha through the activation of cyclooxygenase is responsible for the development and maintenance of hyperplasia in kidney. 相似文献
16.
A technique utilising the concept of reachability in a Petri net is proposed to enumerate all simple paths between two specified nodes of a graph. It is simple and requires little computation. 相似文献
17.
M. Y. Raie M. Ahmad I. Ahmad S. A. Khan S. A. Athar Jafri 《European Journal of Lipid Science and Technology》1983,85(7):279-280
Eight varieties of cottonseed cultivated in Pakistan have been studied. These contain 11.6-24.0% oil and their fatty acid composition as determined by G.L.C. is C14:0 (0.7-2.0%), C14:1 (0-0.3%), C16:0(28.3-43.1%), C16:1 (0.3-2.7%), C18:0 (0.3-8.5%), C18:1 (16.2-32.0%), C18:2 (31.3-41.2%) and C20:0 (0.2-0.3%). 相似文献
18.
Baig Md Amir Moinuddin Athar A. Khan E. Ghanbari M. 《Multimedia Tools and Applications》2022,81(6):7895-7916
Multimedia Tools and Applications - In this paper, blind image quality assessment (IQA) of Gaussian blurred images based on Discrete Fourier Transform (DFT) is proposed. The proposed work is based... 相似文献
19.
Irshad Ahmad Shazia Shukrullah Muhammad Yasin Naz Muhammad Athar Rasheed Mukhtar Ahmad Ejaz Ahmed Muhammad Shoaib Akhtar N.R. Khalid Abid Hussain Sadia Khalid 《International Journal of Hydrogen Energy》2021,46(53):26711-26724
CNTs were decorated onto Sr doped ZnO nanoparticles to construct an efficient photocatalyst via a facile sol-gel method. The as-fabricated Sr doped ZnO/CNTs with recyclability exhibits Sr and CNTs content dependent hydrogen evolution activit under visible light illumination. The Sr doped ZnO/CNTs photocatalyst shows the highest hydrogen evolution rate of 2732.2 μmolh?1g?1, which is 33.7 and 2.83 times higher than pure ZnO and Sr doped ZnO photocatalysts, respectively. The improved hydrogen evolution activity of Sr doped ZnO/CNTs is primarily assigned to high surface area, Sr doping and construction of heterojunction, which can extend the light absorption, decrease the optical band gap and improve the charge separation. Moreover, the underlying photocatalytic mechanism is proposed on the basis of Mott-Schottky study and explains the interfacial charge transfer process from ZnO to CNTs and Sr. This work open new strategies to synthesize CNTs based nanocomposite for hydrogen evolution. 相似文献
20.
Vaishnavi Krishnamurthi Hareem Khan Taimur Ahmed Ali Zavabeti Sherif Abdulkader Tawfik Shubhendra Kumar Jain Michelle J. S. Spencer Sivacarendran Balendhran Kenneth B Crozier Ziyuan Li Lan Fu Md Mohiuddin Mei Xian Low Babar Shabbir Andreas Boes Arnan Mitchell Christopher F. McConville Yongxiang Li Kourosh Kalantar-Zadeh Nasir Mahmood Sumeet Walia 《Advanced materials (Deerfield Beach, Fla.)》2020,32(45):2004247
Atomically thin materials face an ongoing challenge of scalability, hampering practical deployment despite their fascinating properties. Tin monosulfide (SnS), a low-cost, naturally abundant layered material with a tunable bandgap, displays properties of superior carrier mobility and large absorption coefficient at atomic thicknesses, making it attractive for electronics and optoelectronics. However, the lack of successful synthesis techniques to prepare large-area and stoichiometric atomically thin SnS layers (mainly due to the strong interlayer interactions) has prevented exploration of these properties for versatile applications. Here, SnS layers are printed with thicknesses varying from a single unit cell (0.8 nm) to multiple stacked unit cells (≈1.8 nm) synthesized from metallic liquid tin, with lateral dimensions on the millimeter scale. It is reveal that these large-area SnS layers exhibit a broadband spectral response ranging from deep-ultraviolet (UV) to near-infrared (NIR) wavelengths (i.e., 280–850 nm) with fast photodetection capabilities. For single-unit-cell-thick layered SnS, the photodetectors show upto three orders of magnitude higher responsivity (927 A W−1) than commercial photodetectors at a room-temperature operating wavelength of 660 nm. This study opens a new pathway to synthesize reproduceable nanosheets of large lateral sizes for broadband, high-performance photodetectors. It also provides important technological implications for scalable applications in integrated optoelectronic circuits, sensing, and biomedical imaging. 相似文献