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RISS 인기검색어
- 검색키워드
- 저자 : Gupta Nomita (검색결과 2 건)
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Sharma, H.B.,Nomita Devi, K.,Gupta, V.,Lee, J.H.,Bobby Singh, S. Elsevier 2014 Journal of alloys and compounds Vol.599 No.-
<P><B>Abstract</B></P> <P>In this paper we report the synthesis of multiferroic BiFeO<SUB>3</SUB> (BFO)–CoFe<SUB>2</SUB>O<SUB>4</SUB> (CFO) nanocomposites. The XRD and SEM data confirm the formation of both the parent compounds and the composite. All the composite samples show typical frequency dispersion at low frequency. The composite samples possess low dielectric loss. The frequency dependence of ac electrical conductivity curves of the composite samples were fitted using the relation σ ( f ) = <SUB> σ dc </SUB> + A ( T ) <SUP> f n ( T ) </SUP> . It is observed that at lower frequency range the curve is not well fitted suggesting the contribution of small ac conductivity due to electrode polarization effect along with dc conductivity; however at higher frequency the curves are well fitted confirming the frequency dependence of ac conductivity at higher frequency. Frequency dependent of ac conductivity indicates that conduction occurs due to hopping of small polarons among the localized states. BFO shows weak ferromagnetism with coercivity, <I>H<SUB>c</SUB> </I> =374Oe and magnetization, <I>M<SUB>s</SUB> </I> =0.06emu/g at 21kOe. All the composite samples show ferrimagnetic nature and found that there is a decrease in both saturation and remanence magnetization with increase in BFO content. However, there is a variation in coercivity with increase in BFO content and the sample 0.8(BFO)–0.2(CFO) (BF8–CF2) shows maximum <I>H<SUB>c</SUB> </I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of multiferroic BiFeO<SUB>3</SUB> (BFO)–CoFe<SUB>2</SUB>O<SUB>4</SUB> (CFO) nanocomposites. </LI> <LI> The structural parameters were found to depend upon compositions. </LI> <LI> The composite samples have smaller BFO grain sizes. </LI> <LI> BiFeO<SUB>3</SUB> shows higher ac conductivity than other composite samples. </LI> <LI> Enhanced in magnetic properties of BFO in composite form. </LI> </UL> </P>
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New face in the row of bioactive compounds and toxin-antitoxin modules: Xenorhabdus nematophila
Shobhi Chaudhary,Singh Garima,Gupta Nomita,Ghosh Chaitali,Rathore Jitendra Singh 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
Mutualistic symbiosis exists in the natural world between the Enterobacteriaceae genus Xenorhabdus and the entomopathogenic nematode genus Steinernema. Despite the fact that the bulk of the relationships are speciesspecific, a single Xenorhabdus sp. may infect more than one Steinernema sp. During the complex and stressful life cycle inside the gut of insect as well as in soil, Xenorhabdus nematophila produces various bioactive com pounds. These bioactive compounds are responsible for killing of infected insect larvae. It also ensures the reproduction and proliferation of the bacteria and nematodes. In this review, we have discussed various bioactive compounds produced by Xenorhabdus nematophila, proving it extremely critical for novel antibiotic discovery in the era of current antibiotic resistance crisis. The wide range of bioactive compounds produced by X. nematophila have antibacterial as well as antifungal properties. However, some of the bioactive compounds are effective against insects, nematodes, protozoa, and has anti-cancer potential too. Further, we have also discussed the increased production and gene regulation of several antimicrobial compounds. In the end, we have also discussed the presence of Toxin-Antitoxin (TA) systems and their involvement in adaptation to multiple adverse envi ronments for the bacteria.
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