High Performance Thin Layer Chromatography (HPTLC) profile of an insecticidal compound of <Emphasis Type="Italic">Trochus radiatus</Emphasis> and assessment of mucus-associated bacterial extracts     

Mary Elizabeth K. Gnanambal  K. C. Ramya Devi  P. Hareesh Chandra  Edward J. K. Patterson 《Phytoparasitica》2011,39(2):121-127

The current study is based on the screening of novel insecticides from new sources that have not being exploited hitherto. The major objectives of this research work were to extract marine molluscs, Lambis lambis, Trochus radiatus and Chicoreus ramosus, from Tuticorin coastal waters using different solvents to test their insecticidal properties and partially purify the active components. The ethyl acetate extracts of L. lambis and T. radiatus showed 100% mortality of Sitophilus oryzae, at a concentration of 200 μg ml⁻¹. The LC₅₀ values for ethyl acetate extracts of L. lambis, T. radiatus and C. ramosus were found to be 67.08, 348.86 and 571.42 μg ml⁻¹, respectively. With regard to bacterial metabolites, at a concentration of 200 μg ml⁻¹ the ethyl acetate extract of A3 was able to elicit an activity of 40% and that of strain A1 – 20%. The LC₅₀ values of the bacterial metabolites were also investigated. Upon chromatographic separation of active ethyl acetate extracts of T. radiatus, the 100% methanol column-purified fraction was found to have an activity of 30% at a concentration of 10 μg against S. oryzae. The purity of the partially pure active compound was observed to be 72.78% on analysis with high pressure thin layer chromatography.  相似文献   

Productivity of Rainfed Sorghum — A Physiological Analysis     

D. Durga  Devi  K. M. Sundaram  N. Natarajaratnam 《Journal of Agronomy and Crop Science》1987,159(5):360-364

A field experiment was conducted to study the varietal variability of productivity in sorghum under rainfed conditions. Six varieties viz., TNS 24, TNS 27, CO 20, CO 19, CO 24 and K3 were utilized in this study. Among these varieties TNS 24, CO 19 and TNS 27 were found to be tolerant to drought situations while K 3, CO 20 and CO 24 were susceptible. The classification was mainly based on the yield data. Highest leaf area was observed in tolerant varieties, The reduction in leaf area at the harvest stage was also minimal (6.8%) in the tolerant varieties. LAD and CGR also showed higher values in the tolerant varieties. The dry matter accumulation was higher in the tolerant varieties. The yield improvement in the tolerant genotypes is mainly due to the increased dry matter accumulation while harvest index is not related to yield in the varieties studied.  相似文献   

Effect of nano-SiO2 on properties of wood/polymer/clay nanocomposites     

Rashmi Rekha Devi  Tarun K. Maji 《Wood Science and Technology》2012,46(6):1151-1168

Wood polymer nanocomposites (WPNC) based on nano-SiO₂ were prepared by impregnation of styrene acrylonitrile copolymer (SAN), SiO₂ nanoparticles modified with γ-trimethoxy silyl propyl methacrylate (MSMA), and nanoclay into wood. The structure of modified SiO₂ nanoparticles and WPNC was characterized by Fourier transform infrared spectroscopy (FTIR). XRD analysis showed the delaminated structure of SAN/SiO₂/clay-treated wood composites. The synergistic effect of nano-SiO₂ and nanoclay was investigated. Thermal stability of SiO₂ nanoparticles decreased after modification, while that of wood treated with SAN, SiO₂, and nanoclay improved. Morphological characteristics were examined by scanning electron microscopy (SEM). Mechanical properties, water uptake (%), dimensional stability, hardness, and flammability were found to improve due to incorporation of SiO₂ and nanoclay into wood polymer composites. Maximum improvement in properties was observed in the wood polymer composites containing SiO₂ and nanoclay at the ratio of 1:1.  相似文献   

Chemical modification of simul wood with styrene–acrylonitrile copolymer and organically modified nanoclay     

R. R. Devi  T. K. Maji 《Wood Science and Technology》2012,46(1-3):299-315

Simul wood (Salmalia malabarica) was chemically modified by treatment with styrene–acrylonitrile copolymer (SAN), glycidyl methacrylate (GMA), and organically modified nanoclay. The physical properties of wood polymer composites (WPC) were improved due to the addition of GMA and nanoclay. XRD analysis indicated a decrease in crystallinity in WPC. FTIR study confirmed the presence of clay in WPC. The presence of clay in cell lumen and cell wall was evidenced by SEM study. WPC containing lower percentage of clay showed better thermal stability compared to WPC loaded with higher percentage of clay.  相似文献   

Effect of nanofillers on flame retardancy, chemical resistance, antibacterial properties and biodegradation of wood/styrene acrylonitrile co-polymer composites     

Rashmi R. Devi  Tarun K. Maji 《Wood Science and Technology》2013,47(6):1135-1152

Wood polymer nanocomposites (WPNCs) based on simul wood (Bombex ceiba, L.) were prepared by impregnation of styrene acrylonitrile copolymer, γ-methacryloyloxy trimethyl silane-modified TiO₂, SiO₂ nanoparticles and nanoclay intercalating mixture through vacuum impregnation. The impact of nanofillers on the physical properties, flame retardancy, water resistance, anti-swelling efficiency and biodegradability of the resultant WPNCs was investigated. Remarkable enhancement in wood properties such as flame retardancy, water resistance and anti-swelling efficiency was achieved with the treatment. The results showed that all the properties were maximum for wood samples treated with SAN/TiO₂ (0.5 %)/SiO₂ (0.5 %)/nanoclay (0.5 %). The presence of TiO₂ nanoparticles in WPNC exhibited antibacterial activity. The resistance to biodegradation was observed by incorporation of nanofillers into wood.  相似文献   

Bioequivalence of a new liquid formulation of benazepril compared with the reference tablet product     

K Kelers  JL Devi  GA Anderson  P Zahra  JH Vine  T Whittem 《Australian veterinary journal》2013,91(8):312-319

  相似文献   

Bioavailability of two L‐thyroxine formulations after oral administration to healthy dogs     

C Simpson  JL Devi  T Whittem 《Australian veterinary journal》2013,91(3):83-88

  相似文献   

不同光强生态型水稻对始穗期氮钾营养的效应     

王永锐 Devi  LS 《江西农业大学学报》1998,20(1):31-38

杂交水稻Ｌｅ／Ｑｉ在施基肥基础上始穗期追施Ｎ,ＮＫ营养比其亲本和仅施基肥（ＮＰＫ）表现剑叶叶绿素（ａ＋ｂ）总量及可溶性蛋白含量多,ＳＰＳ酶活性及ＳＰＳ／Ｆ－１,６－Ｐａｓｅ的酶活性比率高,１４Ｃ－蔗糖同化物从顶３叶及叶鞘的输出率亦高,剑叶含矿质营养Ｋ,Ｃａ,Ｍｎ,Ｍｇ及Ｆｅ也较高。Ｌｅ／Ｑｉ从抽穗期至蜡熟期残留在叶鞘及茎中的可溶性糖及淀粉的量较少,蜡熟期被分配到穗部的量较多,且与谷产量分别呈极显著及显著正相关,谷产量比Ｌｅｍｏｎｔ（母本）高约３２％,比七挂早（父本）高８％,而光合速率则处于亲本之间,偏于母本。  相似文献   

In Silico and Wet Lab Studies Reveal the Cholesterol Lowering Efficacy of Lauric Acid,a Medium Chain Fat of Coconut Oil     

Devi Lekshmi Sheela  Puthiyaveetil Abdulla Nazeem  Arunaksharan Narayanankutty  Jeksy Jos Manalil  Achuthan C. Raghavamenon 《Plant foods for human nutrition (Dordrecht, Netherlands)》2016,71(4):410-415

  相似文献   

Identification and validation of novel alleles of rice blast resistant gene Pi54, and analysis of their nucleotide diversity in landraces and wild Oryza species     

G. Ramkumar  M. S. Madhav  S. J. S. Rama Devi  B. Umakanth  M. K. Pandey  M. S. Prasad  R. M. Sundaram  B. C. Viraktamath  V. Ravindra Babu 《Euphytica》2016,209(3):725-737

  相似文献