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Singh, Ravindra P,Kang, Da-Yeon,Choi, Jeong-Woo American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.1
<P>Cyclic voltammetry (CV) has been used to investigate the electrochemical behavior of a glutathione (GSH) self assembled monolayer on modified gold electrodes (Bio-SAM). The GSH monolayer exhibits an influence on electrode surface activity. Electrochemically immobilized dsDNA onto a Cyt c/GSH-SAM/Au electrode, which is useful for the fabrication of a nanobiosensing device. The immobilized Cyt c followed by dsDNA immobilized films maintained its surface activity and finally dsDNA/Cyt c/GSH-SAM/Au electrode, targeted for the detection of toxicants. The films were characterized by CV, DPV, and AFM. The differential pulse voltammetry (DPV) technique was applied to detect three kinds of common toxins, 2-aminoanthracene (2-AA), 3-bromobenzanthrone (3-BBA) and bisphenol A (BPhA). The electrochemical signals showed good inverse relationship with the increase of concentrations of toxicants. Our proposed system based on electrochemical method with nanoscale film technology can be applied at highly sensitive biosensor for detecting various toxic chemicals.</P>
Biosensor Arrays for Environmental Pollutants Detection
Ravindra P. Singh,오병근,구기갑,정지영,정시영,최정우 한국바이오칩학회 2008 BioChip Journal Vol.2 No.4
Sensors are an extremely broad field which impacts on many major industrial sectors. This review paper highlights the research carried out during the last 8 years based on recent advances in the development of enzyme and NA (nucleic acid) based biosensors for environmental detection including pollutants and toxic compounds in a wide range of samples. NAbased biosensors are also finding increasing use for the detection of environmental pollutants and their toxicity. Biosensors are now used in a wide variety of disciplines, so that the different types of biosensors are used with their advantages and limitations with different transducers forming the sensing devices, for the different environmental contaminants analysis. The general applications of the enzyme biosensors are highlighted related with an environmental monitoring application. Recent advances in the development and applications of biosensor arrays for environmental detection are highlighted in this review article with special emphasis on functional nucleic acid elements (aptamers, DNAzymes, aptazymes), widely useful in nanobiotechnology and also in lab-on-a-chip technology.
Polyaniline Based Catalase Biosensor for the Detection of Hydrogen Peroxide and Azide
Ravindra P. Singh,Da-Yeon Kang,오병근,최정우 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.4
The CAT/PANi/ITO bioelectrode has been prepared as a catalase biosensor and shows response for monitoring not only of H2O2 but also azide. The sensor exhibited an excellent response to the H2O2 and azide. The linear range of H2O2 was 0.064~1 mM and for azide 0.125~4 mM, respectively. Catalase biosensor was based on the principle of the measurements as the decrease in the differentiation of oxygen level, which has been caused by the inhibition of catalase in the bioactive layer of the biosensor by azide. The repeatability experiments were done in triplicate. The logarithm response of the biosensor to H2O2 (r² = 0.99), as well as, for azide (r² = 0.90) were reported, respectively. The bioelectrode was characterized by CV and AFM. The proposed biosensor would be applied for the determination of H2O2 and azide in various biological samples.
Singh, Ravindra,Rao, D.Raghavendra,Premalatha, V.,Mondal, Sipra,Kariappa, B.K.,Jayaswal, K.P.,Datta, R.K. Korean Society of Sericultural Science 2001 International Journal of Industrial Entomology Vol.2 No.2
Data from an experiment involving six polyvoltine and three bivoltine silkworm breeds have been analysed to know the level of hybrid rigour and cocoon shape variation in Fl hybrids among silkworm breeds with lows medium and high cocoon weight. Results indicated significantly positive heterosis for several quantitative characters with maximum total heterosis over mid parent value in hybrids between low and medium followed by low and low, medium and medium, low and high and high and low cocoon-weighed breeds, respectively. Study on cocoon shape measurement revelled that among Fl hybrids, cocoons of the three combinations such as GNP ${\times}$ CSR2, GNP ${\times}$ J2 and PM ${\times}$ NB4 D2 were comparatively uniform in their cocoon shape. Importance of this study to know the level of heterosis and cocoon shape variability in different silkworm crosses hale been discussed.
Singh, Ravindra,Jayaswal, K.P.,Rao, D.Raghavedra,Kariappa, B.K.,Premalatha, V. Korean Society of Sericultural Science 2002 International Journal of Industrial Entomology Vol.4 No.2
Induction of non-diapause eggs and manifestation of quantitative characters were studied in different seasons by low temperature incubation of eggs of a low yielding diapause with coloured cocoons silkworm breed, RDI of Bombyx mori. Hundred percent of nandiapause eggs were induced when the egg incubation was carried out at 15$^{\circ}C$ followed by incubation initially at $25^{\circ}C$ and then at $15^{\circ}C$. The diapause-nondia-pause relation was found to be reversible. Analysis of variance study demonstrated significant variation in all the quantitative characters whereas significant variation due to different incubation treatments was observed for larval span, fifth instar larval span, cocoon yield/10,000 larvae by weight, cocoon weight, cocoon shell weight, and cocoon shell ratio. study on hybrid vigour skewed significant heterosis over mid parent value for four economic characters viz., cocoon weight, cocoon shell weight, cocoon shell ratio and filament length in a Fl hybrid between RD1 with diapause eggs and Japanese type bivoltine $NB_{4} D_{2}$.
Androgenesis in Mulberry Silkworm Bombyx mori L. : A Review
Singh, Ravindra,Rao, D.Raghavendra,Kariappa, B.K.,Jayaswal, K.P. Korean Society of Sericultural Science 2001 International Journal of Industrial Entomology Vol.3 No.2
Androgenesis in silkworm acquires a special significance as along with combined applications of other breeding strategies like parthenogenesis and cloning, it may serve as n valuable tool for sex control in sericulture as well as selection and production of bisexual homozygous androgenetic lines. Production of hybrid silkworm yielding high proportion of male larvae is of immense use to silk industry (Strunnikov, 1975, 1983). In this review, an attempt has been made to assimilate the works carried out on androgenesis, different techniques of induction towards androgenetic development and its role in silkworm breeding.
Review : Androgenesis in Mulberry Silkworm Bombyx mori L.: A Review
( Ravindra Singh ),( Raghavendra Rao ),( B. K. Kariappa ),( K. P. Jayaswal ) 한국잠사학회 2001 International Journal of Industrial Entomology Vol.3 No.2
Androgenesis in silkworm acquires a special significance as along with combined applications of other breeding strategies like parthenogenesis and cloning, it may serve as a valuable tool for sex control in sericulture as well as selection and production of bisexual homozygous androgenetic lines. Production of hybrid silkworm yielding high proportion of male larvae is of immense use to silk industry (Strunnikov, 1975, 1983). In this review, an attempt has been made to assimilate the works carried out on androgenesis, different techniques of induction towards androgenetic development and its role in silkworm breeding.