Response of callus culture and seedlings of a salt tolerant
rice variety, pokkali, was compared to that of a salt
sensitive variety, hrswa, under conditions of salinity stress
induced by incorporating different quantities of sea water
in the culture media. Seedlings of pokkali showed minimal
symptoms of salt stress under conditions of low salinity and
more severe symptoms including dry of older leaves under
high salinity Conditions. However, seedlings of hrswa
showed severe stress symptoms even under low salinity and
plant death under high salinity conditions. This superior
character of salt tolerance of pokkali over hrswa was,
however, not observed in callus cultures. In both the
cultivars, the severity of symptoms depended on the
intensity of stress. Accumulation of free proline in callus
cultures and seedlings under stress conditions was
monitored. Both pokkali and hrswa accumulated proline
in response to stress to the same level. The response was
same in callus cultures and in seedlings of both cultivars and
the rate of proline accumulation was dependent on the
intensity of stress. This, study, thus, indicates that
accumulation of proline is not indicative of salt tolerance
character in rice.
Shreedevi,T T; Padayatti,P S; Kala,M S; Philip,J; Paulose,C S(Department of Biotechnology, May 25, 1994)
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Abstract:
Optical absorption characteristics of rat blood
affected by diabetes has been studied using photoacoustic
(PA) technique. PA spectrum of blood
depends on the molecular structure of haemoglobin.
The peak value ratio ylQ increases with increase in
the diabetic state. Externally added glucose to
normal blood does not show any increase in y//3 ratio
as seen in the diabetic condition . The increase in yl,8
ratio may be due to the decrease in DPG level and
the resultant shift from R -> T conformation of
majority of diabetic haemoglobin.
Sasi Kumar, P R; Nampoori, V P N; Vallabhan, C P G(Springer, May , 1994)
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Abstract:
The changes in emission characteristics of a neon hollow cathode discharge by resonant laser excitation of 1s 5→2p 2 and 1s 5→2p 4 transition have been studied by simultaneously monitoring the optogalvanic effect and the laser induced fluorescence. It has been observed that resonant excitation causes substantial variation in the relative intensities of lines in the emission spectrum of neon discharge.
Aanandan,C K; Mohanan,P; K G Nair; Supriyo,Dey(Department of Electronics, February 3, 1994)
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Abstract:
The closed form expression for the radiated power of a half-wave
microstrip patch is modified to calculate the impedance
bandwidth of a printed dipole. Analyses of cavity backed flared
and end-loaded printed dipoles are presented
Mohanan,P; K G Nair; Aanandan,C K; Supriyo,Dey(Department of Electronics, February 3, 1994)
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Abstract:
The closed form expression for the radiated power of a half-wave
microstrip patch is modified to calculate the impedance
bandwidth of a printed dipole. Analyses of cavity backed flared
and end-loaded printed dipoles are presented
Supriyo,Dey; Aanandan,C K; Mohanan,P; K G Nair(Microwave and Optical Technology Letters, September , 1994)
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Abstract:
A simple technique to improve the impedance bandwidth of a circular
microstrip patch antenna using two sectorial slots is proposed. Using this
design more than 5% impedance bandwidth is obtained. The added
advantage of this new antenna is that it can be fed by a 50- microstrip line
K G Nair; Aanandan,C K; Mohanan,P; Supriyo,Dey(Department of Electronics, February 3, 1994)
[+]
[-]
Abstract:
The closed form expression for the radiated power of a half-wave
microstrip patch is modified to calculate the impedance
bandwidth of a printed dipole. Analyses of cavity backed flared
and end-loaded printed dipoles are presented
Sugunan, S; Sherly, K B(Indian Journal of Chemistry, October , 1994)
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Abstract:
Lanthanum oxide, La2O3 has been found to be an effective
catalyst for the liquid phase reduction of cyclohexanone.
The catalytic activities of La2O3 activated
at 300, 500 and 800·C and its mixed oxides with
alumina for the reduction of cyclohexanone with
2-propanol have been determined and the data parallel
that of the electron donating properties of the catalysts.
The electron donating properties of the catalysts have
been determined from the adsorption of electron acceptors
of different electron affinities on the surface of
these oxides.
Tennant,A; Dawoud,M M; Anderson,A P(Department of Electronics, April 27, 1994)
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Abstract:
A genetic algorithm has been used for null steering in phased and
adaptive arrays . It has been shown that it is possible to steer the
array null s precisely to the required interference directions and to
achieve any prescribed null depths . A comparison with the results
obtained from the analytic solution shows the advantages of using
the genetic algorithm for null steering in linear array patterns