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排序方式: 共有156条查询结果,搜索用时 15 毫秒
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Manas Dev Maji Sandip Kumar Dutta Chandana Maji 《Archives Of Phytopathology And Plant Protection》2013,46(5):534-538
Brown leaf rust (BLR) caused by Peridiopsora mori is one of the major foliar diseases of mulberry (Morus sp.) in the subtropical hills of eastern India. The disease appeared in first week of August and continued up to September with maximum severity in second and third week of September. The disease symptoms appeared at atmospheric temperature (27.00–20.07°C), relative humidity (92.14–82.43%), rainfall (11.20 cm) and rainy days (7) of the preceding week. Disease severity (>50 PDI) was observed at temperature (26.29–19.29°C), relative humidity (94.14–80.14%), rainfall (4.12 cm) and number of rainy days (2–3 days). Apparent rate of infection was found high at temperature (27.00–19.83°C), relative humidity (94.67–85.00%), rainfall (4.6 cm) and rainy days (2) of the preceding week. The correlation coefficient between disease severity and average meteorological factors of the preceding 7 days revealed that BLR disease severity showed significant negative correlation with minimum temperature. It was also revealed that contribution of maximum and minimum temperature 42.23% and 35.21%, maximum and minimum relative humidity (RH) 11.23% and 10.69% and rainfall and number of rainy days 0.11% and 0.50%, respectively towards development of BLR disease severity. Multiple regression analysis revealed that average of maximum and minimum temperatures and minimum RH of preceding 7 days were found to maximally influence BLR disease severity. 相似文献
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Deepti Barnawal Deepamala Maji Nidhi Bharti Chandan Singh Chanotiya Alok Kalra 《Journal of Plant Growth Regulation》2013,32(4):809-822
This study was aimed at protecting Trigonella plants by reducing stress ethylene levels through ACC (1-aminocyclopropane-1-carboxylic acid) deaminase-containing Bacillus subtilis (LDR2) and promoting plant growth through improved colonization of beneficial microbes like Ensifer meliloti (Em) and Rhizophagus irregularis (Ri) under drought stress. A plant growth-promoting rhizobacterium strain possessing high levels of ACC deaminase characterized as B. subtilis was selected. Application of this strain considerably protected Trigonella plants under severe drought stress conditions; this protection was correlated with reduced levels of ACC (responsible for generation of stress ethylene). The experiment consisted of eight inoculation treatments with different combinations of ACC deaminase-containing rhizobacteria LDR2, Ri, and Em under three water regimes. The tripartite combination of LDR2 + Ri + Em acted synergistically to induce protective mechanisms against decreased soil water availability in Trigonella plants and improved plant weight by 56 % with lower ACC concentration (39 % less than stressed noninoculated plants) under severe drought conditions. Drought-induced changes in biochemical markers like reduced chlorophyll concentration, increased proline content, and higher lipid peroxidation were monitored and clearly indicated the protective effects of LDR2 under drought stress. Under drought conditions, apart from alleviating ethylene-induced damage, LDR2 enhanced nodulation and arbuscular mycorrhizal fungi colonization in the plants resulting in improved nutrient uptake and plant growth. 相似文献
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Anukul Maji Maidul Beg Somnath Das Nandan Kumar Sahoo Pradeep K. Jha Md. Maidul Islam Maidul Hossain 《Luminescence》2019,34(6):563-575
This study describes the eco‐friendly, low‐cost and room‐temperature synthesis of gold nanoparticles from Musa balbisiana leaf extract, which acts as both reducing and stabilizing agent, and characterized by ultraviolet?visible (UV–vis) light spectroscopy, fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE‐SEM), analytical transmission electron microscopy (TEM), energy‐dispersive X‐ray spectroscopy (EDAX) and dynamic light scattering (DLS) instruments. These nanoparticles showed an average diameter of 33.83 ± 3.39 nm, which was confirmed from the size distribution histogram. The bactericidal activity of these nanoparticles was confirmed using bacteria Escherichia coli and Staphylococcus aureus at 1 and 2 nM minimum inhibitory concentrations, respectively. The interaction between nanoparticles and human serum albumin (HSA) was investigated, as this plays significant roles in biological systems. The nature of interaction, binding parameters and structural variation of HSA in the presence of these nanoparticles have been evaluated using several useful spectroscopic approaches such as UV–vis, FTIR, time‐resolved and steady‐state fluorescence, and circular dichroism in addition to the measurement of zeta potential. This interaction study revealed that static quenching occurs in this process with minimal alteration in the secondary structure, but the native structure of HSA remained unaltered. The binding constant and thermodynamic parameters of this interaction process were also evaluated. 相似文献
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Samir Kumar Maji D. Velmurugan A. Razak H. K. Fun Arindam Banerjee 《Letters in Peptide Science》2000,7(6):353-358
Crystallographic and spectroscopic studies of a model dipeptidecontaining unusual amino acid residues establish the presence ofan intramolecular, 5-membered NH...N hydrogen bond involvingan amide NH (from 3-amino phenyl acetic acid residue) and anamide N atom from an adjacent amino acid residue in solid stateand in solution. The dipeptide also forms an infinite -sheet ribbon structure in crystals. 相似文献
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Taking into account that semen quality depends on animal age and climate conditions and that oxidative stress has been reported to be a common cause of infertility, the objective of this study was to monitor indicators of oxidative stress and antioxidant protection during four seasonal periods in service bulls of various age to get better insight into the significance of these factors upon evaluating service bull semen. The research was conducted over a year on 19 Simmental service bulls. Animals were divided into two groups according to age; Group I consisted of younger bulls aged two to four yrs (n = 9), and Group II was comprised of older bulls aged five to ten yrs (n = 10). Semen samples were obtained once in the middle of every seasonal period and blood samples for biochemical analysis were collected by jugular venipuncture immediately after ejaculate collection. The activity of total glutathione peroxidase (T-GSH-Px), selenium-dependent glutathione peroxidase (Se-GSH-Px) and selenium-independent glutathione peroxidase (non-Se-GSH-Px), together with the intensity of lipid peroxidation (thiobarbituric acid reactive substances; TBARS) and oxidative protein damage (protein carbonyl content (PCC)) were measured in seminal plasma. In samples of spermatozoa and blood serum, the activity of Se-GSH-Px and TBARS and PCC concentrations were determined. Older service bulls had significantly higher ejaculate volume in summer in comparison with younger bulls, whereas the number of spermatozoa and progressive motility percentage did not significantly vary with age. Younger animals had lower progressive motility percentage during summer than in spring, with more intensive oxidative processes observed in seminal plasma (TBARS) and spermatozoa (TBARS and PCC). Based on the results presented here, it can be concluded that younger bulls are more sensitive to elevated ambient temperatures during the summer, when intensified prooxidative processes in semen plasma and spermatozoa eventually led to decreased sperm progressive motility with consequential semen quality deterioration. 相似文献
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Protein aggregation and amyloid formation are associated with both pathological conditions in humans such as Alzheimer's disease and native functions such as peptide hormone storage in the pituitary secretory granules in mammals. Here, we studied amyloid fibrils formation by three neuropeptides namely physalaemin, kassinin and substance P of tachykinin family using biophysical techniques including circular dichroism, thioflavin T, congo red binding and microscopy. All these neuropeptides under study have significant sequence similarity with Aβ(25-35) that is known to form neurotoxic amyloids. We found that all these peptides formed amyloid-like fibrils in vitro in the presence of heparin, and these amyloids were found to be nontoxic in neuronal cells. However, the extent of amyloid formation, structural transition, and morphology were different depending on the primary sequences of peptide. When Aβ(25-35) and Aβ40 were incubated with each of these neuropeptides in 1:1 ratio, a drastic increase in amyloid growths were observed compared to that of individual peptides suggesting that co-aggregation of Aβ and these neuropeptides. The electron micrographs of these co-aggregates were dissimilar when compared with individual peptide fibrils further supporting the possible incorporation of these neuropeptides in Aβ amyloid fibrils. Further, the fibrils of these neuropeptides can seed the fibrils formation of Aβ40 and reduced the toxicity of preformed Aβ fibrils. The present study of amyloid formation by tachykinin neuropeptides is not only providing an understanding of the mechanism of amyloid fibril formation in general, but also offering plausible explanation that why these neuropeptide might reduce the cytotoxicity associated with Alzheimer's disease related amyloids. 相似文献
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Peptide/protein hormones could be stored as non-toxic amyloid-like structures in pituitary secretory granules. ACTH and β-endorphin are two of the important peptide hormones that get co-stored in the pituitary secretory granules. Here, we study molecular interactions between ACTH and β-endorphin and their colocalization in the form of amyloid aggregates. Although ACTH is known to be a part of ACTH-β-endorphin aggregate, ACTH alone cannot aggregate into amyloid under various plausible conditions. Using all atom molecular dynamics simulation we investigate the early molecular interaction events in the ACTH-β-endorphin system, β-endorphin-only system and ACTH-only system. We find that β-endorphin and ACTH formed an interacting unit, whereas negligible interactions were observed between ACTH molecules in ACTH-only system. Our data suggest that ACTH is not only involved in interaction with β-endorphin but also enhances the stability of mixed oligomers of the entire system. 相似文献
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针蓟马亚科是蓟马科中已经报道的4个亚科之一,该亚科在伊朗已知5属6种。本文首次报道了伊朗发现的单种属——滑胸针蓟马属Selenothrips Karny及其模式种——红带滑胸针蓟马Selenothrips rubrocinctus(Giard),并编制了针蓟马亚科6个属的检索表,对每个属进行了描述,并对7个种在伊朗的地理分布进行了报道。 相似文献