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Articles by S.K. Dwivedi
Total Records ( 4 ) for S.K. Dwivedi
  Enespa and S.K. Dwivedi
  In the present study, the pathogenic fusaria viz., Fusarium solani f. sp. melongena and F. oxysporum f. sp. lycopersici causing brinjal and tomato wilt were isolated from soil as well as from the infected plant parts. In vitro efficacy of three medicinal plants viz., Azadirachta indica (leaf extract), Psidium guajava (leaf extract), Eucalyptus camaldulensis (bark extract) and three fungal antagonists viz., Trichoderma harzianum, T. atroviride and T. longibrachiatum were tested at 25, 50 and 75% (v/v) by poisoned food technique against both the pathogens. The assessment of fungitoxicity was carried out in terms of percent mycelial growth inhibition against the test fungi. Among different medicinal plant extracts, Azadirachta indica (leaf) was found significantly superior to the rest in suppressing the growth of F. oxysporum f. sp. lycopersici as 100% inhibition was recorded at 50 and 75% concentration followed by Psidium guajava and Eucalyptus camaldulensis on 7th day of inoculation. On the other hand, among different microbial antagonists, T. longibrachiatum against both the test fungi was highly effective and there was 100% inhibition of mycelial growth at 50 and 75% concentration, while T. harzianum was effective against F. oxysporum f. sp. lycopersici followed by T. atroviride as it completely inhibited the mycelial growth at 75% concentration.
  S.K. Dwivedi , Upma Yadav and Enespa
  Aim of this study was to evaluate the efficacy of medicinal plants as well as fungal antagonists against pathogenic fusaria. Pathogenic fusaria viz., Fusarium solani f. sp. melongena and F. oxysporum f. sp. moniliforme causing brinjal and guava wilt are also responsible for significant reduction in yield and quality. Fusarium strains isolated from different sites and identified by Phase Contrast Microscope (PCM) and Scanning Electron Microscope (SEM). The oil and extracts of plant were extracted by hydro distillation in Clevenger apparatus and Soxhlet apparatus. Mycelial growth inhibition was determined by food poison method. In vitro efficacy of five medicinal plants viz., Azadirachta indica (oil and leaf extract), Psidium guajava (leaf extract), Eucalyptus camaldulensis (bark extract), Trachyspermum ammi (seed extract) and Ocimum sanctum (leaf extract) and three microbial antagonists viz., Trichoderma harzianum, T. atroviride and T. longibrachiatum were tested using 4, 8 and 12 μL against both the test fungi on 3rd, 5th and 7th day of inoculation. Among all the medicinal plants, O. sanctum (leaf extract), T. ammi (seed extract) and A. indica (leaf extract) showed 100% inhibition of mycelial growth of F. solani and F. moniliforme at 12 μL concentration on 7th day followed by A. indica (oil), P. guajava and E. camaldulensis. Among different bioagents, T. longibrachiatum against F. solani and F. oxysporum f. sp. moniliforme was found significantly superior to the rest in infecting the growth and showed 100% inhibition at 8 and 12 μL concentrations on 3rd, 5th and 7th day while T. harzianum against both the test fungus was most effective and completely inhibited the mycelial growth at 12 μL concentration on all three days followed by T. atroviride.
  S.K. Dwivedi and Parul Rastogi
  Problem statement: WSD is core problem of many Natural Language Processing (NLP) tasks; information retrieval is one of them. Information Retrieval in Hindi language also faces the similar problem of WSD. Hindi language is spoken by the major population in India. Natives from the rural area come across the setback of Hindi language information retrieval. WSD is one of them. End users do not understand that how the information retrieval system will remove the ambiguity in the queries. An automatic disambiguation system is required to rectify this problem. Various researchers have worked on it and given solutions. But none of them tried to detect the ambiguity in the query before its disambiguation. Approach: We followed entropy based selective query disambiguation approach for Hindi language information retrieval. The approach will identify the ambiguity in the query which will be further disambiguated. The approach is also stimulated by the feature of Google "Did you mean…" for English queries. This study summarizes the ambiguity detection approach as the prior ambiguity detection leads to conserve computation power. Results: We applied the selective query approach on the set of fifty queries. In our query set 35% queries were unambiguous. The survey of results concludes that several times even if the query consists of polysemous word, it is detected as unambiguous. Conclusions/recommendation: The study concludes that the detection of ambiguity is quiet important as it leads to saving computational time. Followed by ambiguity detection, final disambiguation can be done through human intervention based on google feature.
  R.K. Dubey , P. Baranwal , S.K. Dwivedi and U.N. Tripathi
  A series of binuclear Schiff-base complexes of zinc(II) and mercury(II) containing bidentate ligands (HL) [HL = salicylidene-2-methyl-1-aminobenzene (HL1), salicylidene-2-aminopyridine (HL2), and salicylidene-3-nitro-1-aminobenzene (HL3)] with “N” and “O” donors have been synthesized by simple metathetic reactions of anhydrous metal chlorides with sodium salts of Schiff bases (in tetrahydrofuran (THF)/MeOH) in equimolar ratio to produce [(μ-Cl)2M2(L)2 · xTHF] [where M = Zn(II) and Hg(II); L = HL1, HL2, and HL3; x = 0 for (1), (4), (6) and x = 2 for (2), (3), (5)]. The main emphasis on the complexes [(μ-Cl)2M2(L)2 · 2THF] (2), (3), and (5) is given due to their five-coordinate environment around metal ions. The complexes have been characterized by elemental analyses (M, Cl, C, H, N), melting point, and spectral (FT-IR, 1H-NMR, and 13C-NMR) studies. The structural composition of the complexes has been determined by FAB-MS spectral studies. FAB-MS showed the isotopic molecular ion peak [M+] and fragments supporting the formulation. Powder X-ray diffraction study of 6 is also reported showing the crystallite size (404.5 Å) of the complex.
 
 
 
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