Baselius College

Kottayam, India

Baselius College

Kottayam, India
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De Souza E.R.,State University of Feira de Santana | De Souza E.R.,Bahia State University | Krishnaraj M.V.,Jawaharlal Nehru Tropical Botanic Garden and Research Institute | Krishnaraj M.V.,Baselius College | De Queiroz L.P.,State University of Feira de Santana
Rheedea | Year: 2016

Sanjappa E.R. Souza & Krishnaraj (Mimosoideae: Ingeae), a new genus is described here to accommodate a species excluded from Calliandra Benth. Morphological data were obtained from literature, herbarium specimens (ASSAM, CAL, DD, K, P, TBGT and W) and fresh collections made from Western Ghats of Kerala. India. Nuclear (ETS and ITS) and plastid (trnL, trnL-trnF and trnD-trnT) sequences were obtained from the genera belonging to Viguieranthus clade of tribe Ingeae including Calliandra cynometroides Bedd., to establish the phylogenetic relationships. Cladistic analyses based on morphological and molecular data show that C. cynometroides does not nest with the currently recognised species of Calliandra. However, C. cynometroides forms a well-supported distinct monophyletic lineage with Faidherbia A. Chev. and Thailentadopsis Kosterm. that share the same polyad type. Therefore, C. cynometroides is excluded from Calliandra and is established as a new genus.

John J.,Catholicate College | Thomas L.,Catholicate College | George N.A.,Baselius College | Kurian A.,Catholicate College | George S.D.,Manipal University India
Physical Chemistry Chemical Physics | Year: 2015

Dye-nanoparticle mixtures hold great promise in biological as well as photonics applications due to their capability to tailor the emission behavior of dye by tuning the nanoparticles parameters. However, as compared to the well-defined dye-nanoparticle distance, studies lack the understanding of homogenous mixtures of dye and nanoparticles. In this work, we investigate the influence of shape and concentration of gold nanoparticles prepared via green synthesis on the optical properties of fluorescein dye in a dye-nanoparticle mixture. We have investigated the radiative path of deexcitation using steady state fluorescence and the non-radiative path is probed using a laser based dual-beam thermal lens technique. The energy transfer efficiency as well as dye-nanoparticle distance is studied using both techniques. Furthermore, we have explored the influence of nanoparticles parameters on the fluorescence quantum yield of fluorescein using the thermal lens technique. The studies indicate that spherical nanoparticles are efficient quenchers while star shaped nanoparticles can probe larger dye-NP distances. The tailoring of dye properties by tuning nanoparticle parameters can be utilized in diverse areas including bioimaging, solar cells, and sensors. © the Owner Societies 2015.

Thomas L.,Catholicate College | John J.,Catholicate College | Kumar B.R.,Catholicate College | George N.A.,Baselius College | Kurian A.,Catholicate College
Materials Today: Proceedings | Year: 2015

Dual beam Thermal lens technique is employed the thermal diffusivity of gold nanoparticle is synthesized using polyvinyl alcohol as reducing agent. The photoluminescence spectra of all the samples are carried out. The weight ratio of gold chloride increases the fluorescence peak shift towards lower wavelength and its fluorescence intensity decreases. Also the thermal diffusivity of gold nanofluid increases as the weight ratio of gold chloride increases. © 2015 Elsevier Ltd.

Krishnaraj M.V.,Baselius College
Phytotaxa | Year: 2014

Bauhinia hekouensis is transferred to Phanera. © 2014 Magnolia Press.

Krishnaraj M.V.,Baselius College | Mohanan N.,Jawaharlal Nehru Tropical Botanic Garden and Research Institute
Webbia | Year: 2014

Vigna hainiana (=Phaseolus wightianus Grah. ex Wight & Arn.) is lectotypified using Wallichian collections at CAL and an earlier typification of Vigna wightii Benth. ex Bedd. is discussed. © 2014 Dipartimento di Biologia, Università di Firenze.

George N.A.,Baselius College | Peethan A.,Baselius College | Vijayan M.,Baselius College
Nondestructive Testing and Evaluation | Year: 2013

In this article, we report a new method to measure dry rubber content (DRC) in natural latex using a light scattering principle. Latex collected from the field, without diluting or any other chemical processing, can be directly used in this technique to measure its DRC. A laser beam transmitted through a thin column of latex is imaged using a digital camera and the image is processed to calculate the strength of scattering. We have observed a linear relationship between the DRC of the latex and the full width at half of the maximum of the laser beam intensity profile. The method requires only a very small quantity (about 0.5 g) of latex and the measurement is very fast, taking only a few minutes. Although we have demonstrated the described method for latex characterisation, this method can be extended for turbidity/particle concentration measurement of any heavily scattering liquids. © 2013 © 2013 Taylor & Francis.

Latha M.,National Bureau of Plant Genetic Resources Regional Station | Scariah S.,National Bureau of Plant Genetic Resources Regional Station | Krishnaraj M.V.,Jawaharlal Nehru Tropical Botanic Garden and Research Institute | Krishnaraj M.V.,Baselius College | And 4 more authors.
Webbia | Year: 2014

A new species of the genus Vigna Savi of the Section Ceratotropis namely, Vigna konkanensis Latha, K.V. Bhat, I.S. Bisht, Scariah, Joseph John et Krishnaraj, is described and illustrated from the west coast of India. This species is closely allied to Vigna sublobata and Vigna hainiana but differs from both in having glabrous stem, stipule, leaflets and inflorescence, acute leaflets, immature pods without a pinkish spot at the apex, mature pods with sparsely short setose hairs and seeds rough with appressed concentric reticulations on testa. © 2014 Dipartimento di Biologia, Università di Firenze.

George N.A.,Baselius College | Paul A.M.,Baselius College | Saranya M.S.,Baselius College
Optik | Year: 2014

In this paper we report a simple microbend fiber optic sensor using a plastic fiber, LED and photodetector assembly for sensing minute variation of refractive index of chlorinated water. Chlorinated water has slightly higher refractive index and gradual release of chlorine from bleaching powder treated water causes a temporal decrease in refractive index of the solution. The evaporation of chlorine from water and the change in refractive index is found to follow a first order exponential decay function of time. Introducing microbends in an optical fiber is easier and less complex than etching of fiber cladding for traditional optical fiber sensors. © 2013 Elsevier GmbH.

George N.A.,Baselius College | Thomas N.B.,Baselius College | Moidu H.H.,Baselius College | Piyush K.,Baselius College
Optik | Year: 2015

Optical choppers are widely used in combination with continuous wave lasers in many spectroscopic and other materials characterization techniques. However, utmost care has to be taken in the use of an optical chopper in very low frequency applications. In this paper, we have used simple calculations to demonstrate the importance of the relative position of an optical chopper with respect to the laser beam path for minimal impact of the chopper speed on the measurements. We have also demonstrated an alternative simple, low-cost and easy to fabricate electromechanical shutter instead of a chopper for single pulse generation from a continuous wave laser. Focusing of the laser beam on the chopper blade can also minimize the adverse impact of slowly moving chopper wheel. © 2015 Elsevier GmbH. All rights reserved.

Thomas L.,Catholicate College | John J.,Catholicate College | George N.A.,Baselius College | Kurian A.,Catholicate College
Measurement Science and Technology | Year: 2014

Nanotechnology plays a vital role in the development of biosensors by enhancing their sensitivity and performance. In this paper, we report a novel urine sugar sensing method that makes use of the unique properties of silver-nanofluids in combination with the laser induced photothermal lens technique. The thermal lens signal decreases with increase in sugar levels in urine samples, which may be attributed to the enhanced interaction of glucose and conduction electrons of silver-nanoparticles, thereby changing the surface plasmon energy. © 2014 IOP Publishing Ltd.

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