George,J; Deepukumar,M; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, March , 1996)
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Abstract:
A new microstrip antenna geometry with considerable reduction
in size, with similar radiation characteristics to those of an
equivalent rectangular patch antenna is proposed. A relationship
has been suggested for fmding out the resonant frequency of the
new geometry, and its validity has been established by the
experimental results. Without increasing the aperture area, this
geometry also offers a facility for considerably reducing the
resonant frequency compared to conventional patches.
Jacob,George; Aanandan,C K; Mohanan,P; K G Nair; Sreemoolanathan,H; Sebastian,M T(Microwave and Optical Technology Letters, February 20, 1998)
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Abstract:
A new method for enhancing the 2.1 VSWR impedance
bandwidth of microstrip antennas is presented. Bandwidth enhancement
is achieved by loading the microstrip antenna by a ceramic microwave
dielectric resonator (DR). The validity of this technique has been established
using rectangular and circular radiating geometries. This method
improves the bandwidth of a rectangular microstrip antenna to more
than 10% (= 5 times that of a conventional rectangular microstrip
antenna) with an enhanced gain of I dB
Biju,M P; Paulose,C S(Department of Biotechnology, September 27, 1997)
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Abstract:
Kinetic parameters of brain glutamate dehydrogenase (GDH) were compared in the brain
stem, cerebellum and cerebral cortex of three weeks and one year old streptozotocin (STZ)
induced four day diabetic rats with respective controls. A single intrafemoral dose of STZ
(60mg/Kg body weight) was administered to induce diabetes in both age groups. After four days
the blood glucose levels showed a significant increase in the diabetic animals of both age groups
compared with the respective controls. The increase in blood glucose was significant in one year
old compared to the three weeks old diabetic rats. The Vmm of the enzyme was decreased in all
the brain regions studied, of the three weeks old diabetic rats without any significant change in
the Km. In the adult the Vmax of GDH was increased in cerebellum and brain stem but was
unchanged in the cerebral cortex. The K. was unchanged in cerebellum and cerebral cortex but
was increased in the brain stem. These results suggest there may be an important regulatory role
of the glutamate pathway in brain neural network disturbances and neuronal degeneration in
diabetes as a function of age.
Supriya Dey; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, June , 1993)
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Abstract:
A circular miqrostrip antenna with a modified structure is
presented. By adjusting the feed location along the circumference
of the patch it is possible to match the antenna with a C
microstrip line of any impedance. The impedance bandwidth
and radiation characteristics are unaffected by this structural
V modification.
Sugunan, S; Bindhu, Jacob(Indian Journal of Chemistry, October , 1999)
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Abstract:
The acidity of the various rare-earth exchanged zeolite-Y
catalysts has been examined by titration method using Hammett
indicators and is correlated with the catalytic activity of the
samples in the benzylation of 0-xylene.
Seema,P V; Sudha,B; Pius S,Padayatti; Asha,Abraham; Raghu,K G; Paulose,C S(Department of Biotecnology, June , 1996)
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Abstract:
The functional basis of diabetes-mellitus to a certain extent,
can be elucidated by studying diabetes-induced changes
in metabolic enzymes. Malate dehydrogenase (MDH),
is an enzyme directly involved in glucose metabolism. The
kinetic parameters of MDH and its purified cytosolic isozyme,
S-MDH, have been studied in the liver of streptozotocin-
diabetic rats; also the potential of the leaf extract of A.
marmelose as an was investigated. The
Km of the liver enzyme increased significantly, in both
crude and purified preparations in the diabetic state when
compared to Lhe respective controls. Insulin as well as leaf-
•extract treatment of the diabetic rats brought about a reversal
of K. values to near normal. Vmax of purified S-MDH
was significantly higher in the diabetic state when compared
to the control. Insulin and leaf extract treatment did not
reverse this change. Since MDH is an important enzyme in
glucose metabolism, the variation in its quantitative and
qualitative nature may contribute to the pathological status
of diabetes. The fact that leaf extract of A. marmelose
was found to be as effective as insulin in restoration of blood
glucose and body weight to normal levels, the use of A.
marmelose as potential hypoglycemic agent is suggested.
Rani, Joseph(John Wiley & Sons. Inc, August 20, 1998)
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Abstract:
ABSTRACT: Rubber seed oil was used as a multipurpose ingredient in natural rubber
(NR) and styrene butadiene rubber (SBR) compounds. The study shows that the oil,
when substituted for conventional plasticiser, imparts excellent mechanical properties
to NR and SBR vulcanizates. Further, it also improves aging resistance, reduces cure
time, increases abrasion resistance and flex resistance, and reduces blooming.
Supriyo,Dey; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, 1994)
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Abstract:
A new modFed circularpatch antenna resonating at much lower
frequency compared to ordinary circular patch antenna having the same
radius is presented in this paper. me antenna also exhibits wide variation
in input impedance along the circumference of and hence can be matched
with microstrip feedline of any line impedance.
Cashew kernels have high
nutritive value. Upon exposure
to air kernels turn rancid and
their nutritive value decreases.
From this study it is concluded
that chemical treatment using
antioxidants reduced oxidative
rancidity but failed to prevent
deterioration in organoleptic
characteristics and decrease in
protein and carbohydrate
content of stored kernels.
The use of laser excitations at two wavelengths, 488 rim and 514 nm, produced by Argon ion laser in
two plants species, Vicia faba (faba bean) and Allium cepa L., is described to compare the mutagenicity and
the spectrum of chromosomal aberrations induced by laser at mitosis. The laser irradiation has been done
at two power levels 200 and 400 mW with power densities 2.25 mW cm 2 and 4.49 mW cm 2 and different
exposure times (10, 20, 30 and 40 min). The effect produced by laser is compared to those of UV rays and
y- radiations. Laser as in the case of other physical and chenucal mutagens causes a dose-dependent decrease
in mitotic chromosomal aberrations at these wavelengths. It is postulated that laser could be used as a new
radiation system for the induction of mutations.