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排序方式: 共有810条查询结果,搜索用时 73 毫秒
1.
Amjad Islam Jianguo Li Muhammad Pervaiz Zheng‐Hong Lu Mohini Sain Lihui Chen Xinhua Ouyang 《Liver Transplantation》2019,9(10)
Zwitterions, a class of materials that contain covalently bonded cations and anions, have been extensively studied in the past decades owing to their special features, such as excellent solubility in polar solvents, for solution processing and dipole formation for the transfer of carriers and ions. Recently, zwitterions have been developed as electrode modifiers for organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light‐emitting devices (OLEDs), as well as electrolyte additives for lithium ion batteries (LIBs). With the rapid advances of zwitterionic materials, high‐performance devices have been constructed with enhanced efficiencies by introducing them as interface layers and electrolyte additives. In this review, recent progress in OSCs, PVSCs, OLEDs, and LIBs by using zwitterions is highlighted. The authors also elaborate the role of various zwitterionic materials as interfacial layers and additives for highly efficient OSCs, PVSCs, OLEDs, and LIBs. This article presents an overview of device performance of zwitterionic materials. The structure–property relationship is also discussed. Finally, the prospects of zwitterion materials are also addressed. 相似文献
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Md. Javed Equbal Preeti Srivastava Gopal Prasad Agarwal Jahar Kanti Deb 《Applied microbiology and biotechnology》2013,97(17):7755-7766
The industrially important species of corynebacteria viz. Corynebacterium acetoacidophilum appear to be alternative hosts for recombinant protein production; despite many efforts, a strong promoter-based system in corynebacteria has not been established so far. Described here is a T7 promoter-based expression system which was functional in both gram-positive C. acetoacidophilum and gram-negative Escherichia coli in an external inducer independent manner. This is the very first report of a T7 expression system for Corynebacterium sp. Also, it is a useful addition in the existing T7 expression systems of E. coli. 相似文献
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Mushtaq Hussain Syeda Qamarunnissa Saboohi Raza Javed Qureshi Abdul Wajid Sheikh A. Rasool 《Biologia》2009,64(5):852-858
DNA photolyase is perhaps the most ancient and direct arsenal in curing the UV-induced dimers formed in the microbial genome.
Out of two cofactors of the enzyme, catalytic and light harvesting, differences in the latter have provided basis for categorizing
photolyases of prokaryotes as folate and deazaflavin types. In the present study, the homology modeling of DNA photolyase
of Enterococcus faecalis was undertaken. The predicted models were structurally compared with the crystal structure coordinates of photolyases from
Escherichia coli (folate type) and Anacystis nidulans (deazaflavin type). Discrepancies present in the multiple sequence alignment and tertiary structures, particularly at the
light harvesting cofactor (methenyltetrahydrofolic acid, MTHF; 8-hydroxy-5-deazaflavin, 8-HDF) binding sites indicated the
mechanistic nature of enterococcal photolyase. Concisely, despite the greater holistic homology with folate-type photolyase,
enterococcal photolyase was characterized as deazaflavin-type. The presence of 8-HDF binding sites and groove architecture
of substrate binding sites were also found supportive in this regard. The inter cofactor distance and/or orientation also
implied to the efficient energy transfer in photolyase of Enterococcus in comparison with E. coli. In addition, we observed relatively high protein deformability in the enterococcal genome, which may favors the repair action
of photolyase. The findings are expected to provide molecular insights into the difference in sunlight inactivation rate of
two important fecal contamination indicators, namely Enterococcus and E. coli. 相似文献
8.
Imtiyaz Murtaza G. M. Beigha Tanveer Ahmad Shah Amjad Hussain Athar Ali Khan Charanjit Kaur 《Journal of plant biochemistry and biotechnology.》2005,14(2):215-217
Green leafy vegetable extracts of six genotypes of kale (Brassica oleracea acephala) were evaluated for ascorbic acid, carotenoids, total phenolics and antioxidant activity. Ascorbic acid ranged from 142 mg per 100 g in Wappal Hakh to 164 mg per 100 g fr wt in Knol khol. Wild genotypes Wappal and Pumb, had significantly high phenolic content (285 and 227 mg per 100 g fr wt) and possessed highest antioxidant activities (840 and 780 µmol FRAP per g fr wt) than cultivated genotypes. A positive and strong correlation (R2 = 0.807) between total phenolic content and antioxidant activity suggests that kale has enormous potential to enhance the antioxidant potential of our daily food supply. Wild genotypes, Wappal and Pumb can be incorporated into the breeding programmes in order to increase the antioxidant potential of cultivated varieties. 相似文献
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Two DNA fingerprinting techniques, random amplified polymorphic DNA (RAPD) and inter-retrotransposon amplified polymorphism
(IRAP), were used to characterize somaclonal variants of banana. IRAP primers were designed on the basis of repetitive and
genome-wide dispersed long terminal repeat (LTR) retrotransposon families for assessing the somaclonal variation in 2Musa clones resistant and susceptible toFusarium oxysporum f. sp.cubense race 4. RAPD markers successfully detected genetic variation within and between individuals of the clones. IRAP makers amplified
either by a single primer or a combination of primers based on LTR orientation successfully amplified different retrotransposons
dispersed in theMusa genome and detected new events of insertions. RAPD markers proved more polymorphic than IRAP markers. Somaclonal variation
seems to be the result of numerous indels occurring genome-wide accompanied by the activation of retroelements, as a result
of stress caused by micropropagation. It is concluded that characterization of the somaclonal variants requires more than
one DNA marker system to detect variation in diverse components of the genome. 相似文献
10.
Mahboob Ahmad Malik M. Ahmad Rifat Hamid M. Z. Abdin Saleem Javed 《Mycotoxin Research》2013,29(1):39-45
Aflatoxins are one of the most important secondary metabolites. These extrolites are produced by a number of Aspergillus fungi. In this study, we demonstrate the effect of media components and enhanced aflatoxin yield shown by A. flavus using response surface methodology in response to different nutrients. Different components of a chemically defined media that influence the aflatoxin production were monitored using Plackett–Burman experimental design and further optimized by Box–Behnken factorial design of response surface methodology in liquid culture. Interactions were studied with five variables, namely sorbitol, fructose, ammonium sulfate, KH2PO4, and MgSO4.7H2O. Maximum aflatoxin production was envisaged in medium containing 4.94 g/l sorbitol, 5.56 g/l fructose, 0.62 g/l ammonium sulfate, 1.33 g/l KH2PO4, and 0.65 g/l MgSO4·7H2O using response surface plots and the point prediction tool of the DESIGN EXPERT 8.1.0 (Stat-Ease, USA) software. However, a production of 5.25 μg/ml aflatoxin production was obtained, which was in agreement with the prediction observed in verification experiment. The other component (MgSO4.7H2O) was found to be an insignificant variable. 相似文献