Qinghe, Mao; John, Lit W Y(Microwave and Optical Technology Letters, November 20, 2002)
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Abstract:
The transient characteristics of an erbium-doped fiber
(F.DF) laser, which can switch between wavelengths. are investigated.
77te laser has a set of coupled linear cavities. The slow gain dynamics
of EDFs and the cross-gain saturation in the coupled cavities give rise
to delayed switching responses and relocation oscillations, which are
respertively measured to be l ins and 3.5 ms for the worst rase, and
which mar be decreased by increasing the pump power. Thus, the
switching speed of the laser may be higher than 100 Hz
Transparent diode heterojunction on ITO coated glass substrates was fabricated using p-type AgCoO2 and n-type ZnO films by pulsed laser
deposition (PLD). The PLD of AgCoO2 thin films was carried out using the pelletized sintered target of AgCoO2 powder, which was synthesized
in-house by the hydrothermal process. The band gap of these thin films was found to be ~3.89 eV and they had transmission of~55% in the
visible spectral region. Although Hall measurements could only indicate mixed carrier type conduction but thermoelectric power measurements of
Seebeck coefficient confirmed the p-type conductivity of the grown AgCoO2 films. The PLD grown ZnO films showed a band gap of ~3.28 eV,
an average optical transmission of ~85% and n-type carrier density of~4.6×1019 cm− 3. The junction between p-AgCoO2 and n-ZnO was found
to be rectifying. The ratio of forward current to the reverse current was about 7 at 1.5 V. The diode ideality factor was much greater than 2.
Rani, Joseph(Huthig & Wepf Verlag, Basel, April 29, 1986)
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Abstract:
Tribasic lead sulphate is tried as a practical curing agent for polychloroprene. The
cure characteristics of the compounds as well as the technical properties of the
vulcanizates show that it can act as a potential curative.
Mythili, P; Jose, B R; Mathew, J; Pradhan, D K(IEEE, September 26, 2007)
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Abstract:
This paper presents a cascaded 2-2-2
reconfigurable sigma-delta modulator that can handle
GSM, WCDMA and WLAN standards. The modulator
makes use of a low-distortion swing suppression topology
which is highly suitable for wide band applications. In
GSM mode, only the first stage (2nd order Σ-Δ ADC) is
turned on to achieve 88dB dynamic range with oversampling
ratio of 160 for a bandwidth of 200KHz; in
WCDMA mode a 2-2 cascaded structure (4th order) is
turned on with 1-bit in the first stage and 2-bit in the
second stage to achieve 74 dB dynamic range with oversampling
ratio of 16 for a bandwidth of 2MHz and a 2-2-2
cascaded MASH architecture with a 4-bit in the last stage
to achieve a dynamic range of 58dB for a bandwidth of
20MHz. The novelty lies in the fact that unused blocks of
second and third stages can be switched off taking into
considerations like power consumption. The modulator is
designed in TSMC 0.18um CMOS technology and operates
at 1.8 supply voltage.
Mythili, P; Jawar, Singh; Babita, Jose R; Jimson, Mathew(IEEE, December 17, 2007)
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Abstract:
This work presents a triple-mode sigma-delta modulator
for three wireless standards namely GSM/WCDMA and
Bluetooth. A reconfigurable ADC has been used to meet
the wide bandwidth and high dynamic range requirements
of the multi-standard receivers with less power
consumption. A highly linear sigma-delta ADC which has
reduced sensitivity to circuit imperfections has been
chosen in our design. This is particularly suitable for wide
band applications where the oversampling ratio is low.
Simulation results indicate that the modulator achieves a
peak SNDR of 84/68/68 dB over a bandwidth of
0.2/3.84/1.5 MHz with an oversampling ratio 128/8/8 in
GSM/WCDMA/Bluetooth modes respectively
Description:
10th International Conference on Information Technology
This paper deals with brief overview of the developments of international provisions on IPR related to public health. It
discusses flexibilities before and after TRIPS Agreement and difficulties faced by developing countries in implementing
TRIPS obligations and protecting public health. Also discussed are the reasons for the Doha Declaration and issues relating
to implementation of Para 6 of the Declaration. Discusses the inadequacy in the compulsory licence based approach to solve
public health crisis and argues for a more comprehensive approach to find a long term solution to the public health issues
Description:
Journal of Intellectual Property Rights
Vol 13, September 2008, pp 395-400
Bright Singh, I S; Kulkarni, A; Rombout, J H W M; Sudheer, N S; Vlak, J M; Caipang, C M A; Kiron, V; Brinchmann, M F(Elsevier, October 26, 2012)
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Abstract:
Several oral vaccination studies have been undertaken to evoke a better protection against white spot
syndrome virus (WSSV), amajor shrimp pathogen. Formalin-inactivated virus andWSSV envelope protein
VP28 were suggested as candidate vaccine components, but their uptake mechanism upon oral delivery
was not elucidated. In this study the fate of these components and of live WSSV, orally intubated to black
tiger shrimp (Penaeus monodon) was investigated by immunohistochemistry, employing antibodies
specific for VP28 and haemocytes. The midgut has been identified as the most prominent site of WSSV
uptake and processing. The truncated recombinant VP28 (rec-VP28), formalin-inactivated virus (IVP) and
live WSSV follow an identical uptake route suggested as receptor-mediated endocytosis that starts with
adherence of luminal antigens at the apical layers of gut epithelium. Processing of internalized antigens is
performed in endo-lysosomal compartments leading to formation of supra-nuclear vacuoles. However, the
majority of WSSV-antigens escape these compartments and are transported to the inter-cellular space via
transcytosis. Accumulation of the transcytosed antigens in the connective tissue initiates aggregation and
degranulation of haemocytes. Finally the antigens exiting the midgut seem to reach the haemolymph. The
nearly identical uptake pattern of the different WSSV-antigens suggests that receptors on the apical
membrane of shrimp enterocytes recognize rec-VP28 efficiently. Hence the truncated VP28 can be
considered suitable for oral vaccination, when the digestion in the foregut can be bypassed
Chandrasekaran, M; Manzur Ali, P P; Rekha Mol, K R; Sapna, K; Sarita,G Bhat(Springer, March 11, 2014)
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Abstract:
Protease inhibitors can be versatile tools mainly in the fields of medicine, agriculture and
food preservative applications. Fungi have been recognized as sources of protease inhibitors,
although there are only few such reports on mushrooms. This work reports the purification and
characterization of a trypsin inhibitor from the fruiting body of edible mushroom Pleurotus
floridanus (PfTI) and its effect on the activity of microbial proteases. The protease inhibitor was
purified up to 35-fold by DEAE-Sepharose ion exchange column, trypsin-Sepharose column and
Sephadex G100 column. The isoelectric point of the inhibitor was 4.4, and its molecular mass was
calculated as 37 kDa by SDS-PAGE and 38.3 kDa by MALDI-TOF. Inhibitory activity confirmation
was by dot-blot analysis and zymographic activity staining. The specificity of the inhibitor
toward trypsin was with Ki of 1.043×10−10 M. The inhibitor was thermostable up to 90 °C with
maximal stability at 30 °C, active over a pH range of 4–10 against proteases from Aspergillus
oryzae, Bacillus licheniformis, Bacillus sp. and Bacillus amyloliquefaciens. Results indicate the
possibility of utilization of protease inhibitor from P. floridanus against serine proteases
Description:
Appl Biochem Biotechnol (2014) 173:167–178
DOI 10.1007/s12010-014-0826-1
Bijumon, P V; Sreedevi, Menon K; Suma,M N(Microwave and Optical Technology Letters, November 5, 2005)
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Abstract:
rectangular low-density, high-permittivity dielectric
resona or antenna (DRA) excited by T-shaped microstrip feed offering a
2:1 VSWR bandwidth of -22% at 2.975 GHz is reported. The design
methoaology and experimental results of the antenna are discussed. The
excellent gain and radiation performance of the proposed antenna
project: it as a potential candidate for telecommunication applications
The present work describes the immobilization of α-amylase over well ordered mesoporous molecular sieve SBA-15 with different pore diameters synthesized by post synthesis treatment (PST) hydrothermally after reaction at 40°C. The materials were characterized by N 2 adsorption–desorption studies, small angle X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy. Since α-amylase obtained from Bacillus subtilis has dimensions of 35 × 40 × 70 Å it is expected that the protein have access to the pore of SBA-15 (PST-120°C) with diameter 74 Å. The pore dimension is appropriate to prevent considerable leaching. The rate of adsorption of the enzyme on silica of various pore sizes revealed the influence of morphology, pore diameter, pore volume and pH.
Shyam S,Pattnaik; Dhruba C,Panda; Devi,S(Microwave and Optical Technology Letters, September 20, 2002)
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Abstract:
The mathematical formulation of empirically developed formulas Jirr the calculation of the resonant frequency of a thick-substrate
(h s 0.08151 A,,) microstrip antenna has been analyzed. With the
use qt' tunnel-based artificial neural networks (ANNs), the resonant frequency
of antennas with h satisfying the thick-substrate condition are
calculated and compared with the existing experimental results and also
with the simulation results obtained with the use of an IE3D software
package. The artificial neural network results are in very good agreement
with the experimental results
Riju, C Issac; Pramod, Gopinath; Geetha K, Varier; Nampoori, V P N; Vallabhan, C P G(American Institute of Physics, July 13, 1998)
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Abstract:
Laser-induced plasma generated from a silver target under partial vacuum conditions using the
fundamental output of nanosecond duration from a pulsed Nd:yttrium aluminum garnet laser is
studied using a Langmuir probe. The time of flight measurements show a clear twin peak
distribution in the temporal profile of electron emission. The first peak has almost the same duration
as the laser pulse while the second lasts for several microseconds. The prompt electrons are
energetic enough ('60 eV) to ionize the ambient gas molecules or atoms. The use of prompt
electron pulses as sources for electron impact excitation is demonstrated by taking nitrogen, carbon
dioxide, and argon as ambient gases.
Bindhu, C V; Harilal, S S; Achamma, Kurian; Nampoori, V P N; Vallabhan, C P G(World Scientific Publishing Company, 1998)
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Abstract:
Dual beam transient thermal lens studies were carried out in rhodamine 6G methanol solutions using 532 nm pulses from a frequency doubled Nd:YAG laser. Analysis of thermal lens signal shows the existence of different nonlinear processes like two photon absorption and three photon absorption phenomena along with one photon absorption. Concentration of the dye in the solution has been found to influence the occurrence of the different processes in a significant way.
Sreekumar, J; Nandakumaran, V M(World Scientific Publishing Company, 1990)
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Abstract:
Large amplitude local density fluctuations in a thin superfluid He film is considered. It is shown that these large amplitude fluctuations travel and behave like "quasi-solitons" under collision, even when the full nonlinearity arising from the Van der Waals potential is taken into account.
Bindu, G; Santhosh John, Abraham; Anil, Lonappan; Vinu, Thomas; Aanandan,C K; Mathew, K T(International Journal of Cancer Research, 2006)
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Abstract:
Despite its recognized value in detecting and characterizing breast disease, X-ray
mammography has important limitations that motivate the quest for alternatives to augment
the diagnostic tools that are currently available to the radiologist. The rationale for pursuing
electromagnetic methods are based on the significant dielectric contrast between normal
and cancerous breast tissues, when exposed to microwaves. The present study analyzes
two-dimensional microwave tomographic imaging on normal and malignant breast tissue
samples extracted by mastectomy, to assess the suitability of the technique for early
detection ofbreast cancer. The tissue samples are immersed in matching coupling medium
and are illuminated by 3 GHz signal. 2-D tomographic images ofthe breast tissue samples
are reconstructed from the collected scattered data using distorted Born iterative method.
Variations of dielectric permittivity in breast samples are distinguishable from the obtained
permittivity profiles, which is a clear indication of the presence of malignancy. Hence
microwave tomographic imaging is proposed as an alternate imaging modality for early
detection ofbreast cancer.
Bright Singh, I S; Rosamma, Philip; Chaithanya, E R; Swapna, Antony P; Afsal, V V(Elsevier, June 27, 2012)
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Abstract:
Anti-lipopolysaccharide factors (ALFs), a type of cationic antimicrobial peptides (AMPs), and their derivatives
are becoming predominant candidates for potential drugs in viral and bacterial diseases. This study
reports the first ALF from the mud crab Scylla tranquebarica (StALF, JQ899453) and the second ALF isoform
from the blue swimmer crab Portunus pelagicus (PpALF2, JQ899452). Both sequences encoded for precursor
molecules, starting with a signal peptide containing 26 amino acid residues, followed by a highly
cationic mature peptide, containing two conserved cysteine residues flanking a putative lipopolysaccharide
(LPS)-binding domain. BLAST analysis revealed that both PpALF2 and StALF exhibited significant
similarity with crustacean ALF sequences. The predicted molecular mass of the mature ALFs was 11.2 kDa
with an estimated pI of 10.0. PpALF2 and StALF also showed the typical pattern of alternating hydrophobic
and hydrophilic residues in their putative disulphide loop, suggesting that they comprise the same
functional domain. Phylogenetic analysis showed that PpALF2 and StALF have similar evolutionary status
and they were phylogenetically ancient immune effector molecules which may play an essential role in
the host defense mechanism. The spatial structures of PpALF2 and StALF possessed four beta-strands and
two alpha-helices. The results indicated that there were more than one ALF involved in crab immunity
against various pathogens. ALFs would provide candidate promising therapeutic or prophylactic agents
in health management and diseases control in crustacean aquaculture
Bijoy, Nandan S; Subhash Babu, K K(Magnolia Press, December 6, 2010)
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Abstract:
Two new clam shrimp species belonging to the genera Eulimnadia Packard, 1874 and Leptestheria Sars 1898 from Kerala, India are described. Spinicaudatan clam shrimp are among the least studied groups in India, with only 30 species reported. Eulimnadia azisi sp. nov. was collected from rain fed, temporary, rocky depressions at Vettilapara, in Western Ghats, Kerala. No males were observed and the population may be hermaphroditic. Leptestheria dumonti sp. nov. was collected from the paddy fields at Parapukara, Kerala. Altogether two species of Leptestheria and nine species of Eulimnadia have been reported from India, and this is the first report of the genus Leptestheria from Kerala.
Mohammed Yusuff, K K; Varsha, Gopalakrishnan; Arun, Vasudevan; Robinson, P P; Manju, Sebastian; Digna, Varghese; Leeju, P; Jayachandran, V P(Elesvier,Tetrahedron Letters (2010), February 15, 2010)
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Abstract:
An efficient one-pot synthesis of two new heterocyclic perimidines 4-(2,3-dihydro-1H-perimidin-2-yl)-2-methoxyphenol and
2-(quinoxalin-2-yl)-2,3-dihydro-1H-perimidine in good yields is presented. This methodology provides a simple, straightforward synthetic
route to these interesting classes of heterocycles. Crystal structure, solvatochromism and antibacterial activity of these organic compounds
are discussed.
Mohammed Yusuff, K K; Digna, Varghese; Arun, Vasudevan; Robinson, P P; Manju, Sebastian; Leeju, P; Varsha, Gopalakrishnan(International Union of Crystallography, Acta Crystallographica Section C ,Crystal Structure Communications, November 11, 2009)
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Abstract:
The Schiff base compounds N,N0-bis[(E)-quinoxalin-2-ylmethylidene]
propane-1,3-diamine, C21H18N6, (I), and N,N0-bis[(E)-
quinoxalin-2-ylmethylidene]butane-1,4-diamine, C22H20N6,
(II), crystallize in the monoclinic crystal system. These
molecules have crystallographically imposed symmetry.
Compound (I) is located on a crystallographic twofold axis
and (II) is located on an inversion centre. The molecular
conformations of these crystal structures are stabilized by
aromatic pye stacking interactions.