Dakshinamurti,K; Paulose,C S(Department of Biotechnology, May , 1983)
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Abstract:
The concentrations of serotonin in various brain areas were significantly decreased in
the pyridoxine-deficient young rat.
2. There was no change in the concentration of dopamine.
3. Both Bmax and Kid of [3H]serotonin binding to membrane preparations from cerebral cortex
were increased in deficiency and were restored to normal upon pyridoxine supplementation.
4. There was no change in [3H]spiroperidol binding to corpus striatal membrane preparations
in pyridoxine-deficient rats.
Anantharaman, M R; Seshan, K; Keer, H V; Shringi, S N(Springer, December 28, 1983)
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Abstract:
Optimum conditions and experimental details for the formation of v-Fe203 from
goethite have been worked out. In another method, a cheap complexing medium of starch was
employed for precipitating acicular ferrous oxalate, which on decomposition in nitrogen and
subsequent oxidation yielded acicular y-Fe203. On the basis of thermal decomposition in dry
and moist nitrogen, DTA, XRD, GC and thermodynamic arguments, the mechanism of
decomposition was elucidated. New materials obtained by doping ~'-Fe203 with 1-16 atomic
percent magnesium, cobalt, nickel and copper, were synthesised and characterized
Description:
Bull. Mater. Sci., Vol. 6, No. 1, February 1984, pp. 59--64.
Zachariah,E J; Vasudevan, K; Pravinkumar,P A; Mohanan, P; K G Nair(Indian Journal of Radio & Space Physics, February , 1984)
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Abstract:
The design, erection and evalution procedures for it microwave anechuic chamber competed at Cochin University for
antenna studies are presented the chamber has an average reflectivity level of - 32 dB on at X-band frequencies, and it i,
comparable to international standards.
Mohanan, P; Aanandan,C K; K G Nair(Indian Journal of Radio & Space Physics, February , 1984)
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Abstract:
A modified H-plane sectoral horn antenna with identical E- and'H- plane.patterns over the X-band frequency is discussed.
This system has significantly reduced side lobes and hack lobes. Half=power beam width and gain of the antenna are also
improved with enhanced matching , Experimental results for a number of horns with various flanges are presented . These find
practical application for illuminating symmetric antennas like paraboloids and polarization measurements in radio
astronomy, etc. Compared to the fixed pyramidal horns. the present system offers great convenience in trimming the antenna
characteristics
Mohanan, P; Girijavallabhan, C P; Aanandan,C K; K G Nair(Indian Journal of Radio & Space Physics, February , 1984)
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Abstract:
A forward - biased point contact germanium signal diode placed inside a waveguide section along the E -vector is found to
introduce significant phase shift of microwave signals . The usefulness of the arrangement as a phase modulator for microwave
carriers is demonstrated. While there is a less significant amplitude modulation accompanying phase modulation , the insertion
losses are found to be negligible. The observations can be explained on the basis of the capacitance variation of the barrier layer
with forward current in the diode
Paulose,C S; Dakshinamurti,K(Department of Biotechnology, April 24, 1984)
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Abstract:
The high-affinity of [3H]y-aminobutyric acid (GABA) to GABAA receptors and [3H]baclofen to
GABAB receptors were studied in the cerebellum of pyridoxine-deficient rats and compared to
pyridoxine-supplemented controls. There was a significant increase in the maximal binding ( Bmax) of both
GABAA and GABAB receptors with no significant difference in their binding affinities (Kd). The changes
observed suggest a supersensitivity of GABAA and GABAB receptors which seems to correlate negatively
with the concentration of GABA in the cerebellum of pyridoxine-deficient rats.
Aanandan,C K; Mohanan, P; K G Nair(Department of Electronics, August 13, 1984)
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Abstract:
Design and development of a circularly polarized and matched H-plane sectorial horn antenna have been reported By
proper trimming of the flange parameters any desired polarization can be obtained from the horn
Dakshinamurti,K; Paulose,C S; Thliveris,J A; Vriend,J(Department of Biotechnology, August 15, 1984)
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Abstract:
In pyridopaminedoxine-deficient young rats hypothalamic serum TSH concentration was detected. Highly signifiserotonin
was decreased with no changes in the cant decreases in the content of pituitary TSH and in
and noradrenaline content. Serum the number of pituitary thyrotroph secretory granules
and tri-iodothyronine concentrations were were found. These results suo
mmuuchch lower in the deficient rats as compared to thyroidism of suggest that the hypocontrols.
No significant of hypothalamicp yorirdigoxinin.e -deficient young rats might bbee
difference between deficient and control groups in the
Sugunan, S(Indian Journal of Chemistry, September , 1984)
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Abstract:
The Setschenow parameters of solubility in salt solutions and the
thermodynamic parameters (25·C) of transfer from aqueous
solution to aqueous salt solutions for 2-nitrobenzoic acid and 3-nitrobenzoic
acid have been reported. The data have been
rationalized on the basis of the localized hydrolysis model and the
structure breaking action of ions of the electrolytes.
Paulose,C S; Dakshinamurti,K(Department of Biotechnology, December 19, 1984)
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Abstract:
The high-affinity bindings of [3H]-5-hydroxytryptamine to serotonin S-1 receptors,
[3H]-ketanserin to serotonin S-2 receptors in the cerebral cortex, [3H]-
fluphenazine to dopamine D-1 receptors, and [3H]-spiroperidol to dopamine D-2
receptors in the corpus striatum were studied in pyridoxine-deficient rats and
compared to pyridoxine-supplemented controls. There was a significant increase
in the maximal binding (Bmax) of serotonin S-1 and S-2 receptors with a significant
decrease in their binding affinities (Kd). However, there were no significant
changes either in the maximal binding or binding affinity of striatal dopamine D-
1 and D-2 receptors. Receptor sensitivity seems to correlate negatively with the
corresponding neurotransmitter concentrations in the pyridoxine-deficient rats.
Chandrasekaran, M; Lakshmanaperumalsamy, P; Chandramohan, D(1985)
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Abstract:
The spoilage characteristics of bacterial strains were studied by growing them
at 28 _+ 2 °C in agar and broth media prepared with sterile fish and prawn flesh
homogenates. The percentage of spoilers found among the bacterial isolates
tested, as shown by odour production and halo zone formation, was independent
of the source of flesh used. Indole and fluorescent pigment production were
also observed in the broth. Pseudomonas, Vibrio and Acinetobacter exhibited
faster growth in flesh media than in the usual artificial media. Decrease of protein
and lipid concentration in the clear zone of agar media suggests the utilization
of the available substrate by spoilage bacteria.
For the discrete-time quadratic map xt+1=4xt(1-xt) the evolution equation for a class of non-uniform initial densities is obtained. It is shown that in the t to infinity limit all of them approach the invariant density for the map.
Dakshinamurti,K; Paulose,C S; Siow,Y L(Department of Biotechnology, 1985)
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Abstract:
Pyridoxal 5'-phosphate (PLP) is the major coenzymatic
form of pyridoxine. There are over one hundred known pyridoxal
5'-phosphate-dependent reactions, most of which are
involved in the metabolism of various amino acids . Pyridoxamine
5'-phosphate can function in aminotransf erase reactions
by the cyclic regeneration of the two active phosphate
forms. Pyridoxal 5'-phosphate-dependent reactions studied
in the nervous system are involved in the catabolism of various
amino acids. The putative neurotransmitters , dopamine,
norepinephrine , serotonin , histamine , aminobutyric acid
and taurine , as well as the sphingoiipids and poly amines are
synthesized by PLP-dependent enzymes. Of these enzymes,
three ( glutamic acid decarboxylase , 5-hydroxytryptophan decarboxylase
and crnithine decarboxylase) seem to have crucial
roles (Fig. '). The clinical effects of pyridoxine deficiency
can be explained on the basis of the known decreases
in the activities of these enzymes
Rani, Joseph(Gordon and Breach Science Publishers, Inc., May 20, 1985)
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Abstract:
Polychloroprene (neoprene) has been blended with polyvinylchloride (PVC) in different
proportions using a new stabiliser system (magnesium oxide and zinc oxide with
stearic acid) for PVC. The physical properties of the blends show that they can
advantageously replace neoprene in many applications.
Rani, Joseph(Gordon and Breach Science Publishers, Inc., August 30, 1985)
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Abstract:
Blends of natural rubber (NR) with styrene-butadiene rubber (SBR), polybutadiene
rubber (BR), ethylene-propylene terpolymer (EPDM) and acrylonitrile-butadiene
rubber (NBR) were vulcanised using an efficient vulcanisation (EV) system and a
semi-EV system. Compatible blends show a definite pattern of curing whereas the
incompatible blends show no such pattern.
Dakshinamurti,K; Paulose,C S; Vriend,J(Department of Biotechnology, September 5, 1985)
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Abstract:
Pyridoxine-deficient young rats (3 weeks old) had
significantly reduced levels of pituitary TSH, serum
thyroxine (T4) and tri iodothyn nine (T,,) Compared
with pyridoxine-supplemented rats. The status of the
pituitary-thyroid axis of normal, pyridoxine-supplemented
and pyridoxine-deficient rats was evaluated
by studying the binding parameters of [3H](3-nicthylhistidine2)
TRH in the pituitary of these rats. The
effects of TRH and 1'4 injections on pituitary TSH
and serum TSH, T4 and T3 of these two groups were
also compared. The maximal binding of TRH receptors
in the pituitary of pyridoxine-deficient rats was
significantly higher than that of pyridoxine-supplemented
control and normal rats, but there was no change in the binding affinity. Treatment with TRH
stimulated TSH synthesis and release. It also
increased serum T4 and T3 in both pyridoxine-supplemented
and pyridoxine-deficient rats. Treatment with
T4 decreased serum and pituitary TSH in both
pyridoxine-supplemented and pyridoxine-deficient
rats, compared with saline-treated rats. The increased
pituitary TRH receptor content, response to TRH
administration and the fact that regulation at the level
of the pituitary is not affected in the pyridoxinedeficient
rat indicates a hypothalamic origin for the
hypothyroidism of the pyridoxine-deficient rat.
Sreekumar, J; Nandakumaran, V M(Physics Letters, October 21, 1985)
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Abstract:
The phenomenon of two-soliton resonances of the Kadomtsev-Petviashvilli equation for the superfluid surface density fluctuation in He films is studied. The velocity of the resonant soliton is obtained.
Sudha Kartha, C; Ramachandran, T; Nampoori, V P N; Sathianandan, K(Solid State Communications, 1986)
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Abstract:
Variations in the decay times of the characteristic green emissions at 522.7, 551.3, 549.6, 547.6, 542.2, 540.2, 535.9 and 533.5nm from
CaF2 :H03+ with concentration are studied at RT and LNT. A pulsed N2
laser beam of power density 1.5 MW cm-2 is used for the excitation.
Temperature dependent concentration quenching of the decay times are
observed for all the emission bands. But an increase in the decay time due
to the reabsorption process is also observed for a few of the above bands.
Abdul Rasheed, T M; Nampoori, V P N; Sathianandan, K(Chemical Physics, 1986)
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Abstract:
The vibrational overtone spectra 0f the liquid phase 1,2-dichloroethane and 1,2-dibromoethane in the spectral regions of
CH stretching local mode overtones corresponding to delta v CH= = 2 to delta v CH=5 are reported. The observed spectral features are
assigned using the local mode model. LocaI mode frequencies WCH and diagonal local mode anharmonicities XCH are
obtained from an analysis of the spectra. The local-local combinations observed are interpreted on the basis of a coupled CH
oscillator model hamiltonian. Local-normal combinations show complex structures and their possible assignments are given.