Ponnachan, P T C; Paulose, C S; Panikkar, K R(Department of Biotechnology, April , 1993)
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Abstract:
Alloxan induced animal model was used to evaluate the potential antidiabetic effect of A . marmelose leaf
extract. The diabetic animals were given insulin injection and another group A . marmelose leaf extract orally.
It maintained the weight of the animals near to the control rats but a significant decrease in weight was noted it
diabetic animals without any treatment . The blood elucose level in 'treated animals were near to that of control
ones. Also a significantly increased glucose tolerance was observed in animals orally given the leaf extract
prior to the experiment . A significant decrease in liver glycogen ( 1.24 -.07 s!/ 100 g of wet tissue) was observed
in diabetic rats which was brought to almost the normal level (I.84- . 14 g; 100 g) with Icaf extract treatment.
Blood urea and serum cholesterol increased ( 62.66 - 3.50 and 192.67± 13.64 mg' dl) significantly in alloxxan
diabetic rats . The leaf extract treatment decreased the blood urea and serum . cholesterol (37.83 - 3.97 and
99?0±8.43 mg/dl ) to that of control ones . A similar effect was seen with insulin treatment . The results
indicate that the active principle in .4. marmelose leaf extract has similar hypoglycaemic activity to insulin
treatment.
Stephen,D S; Mathew,T; Jose,K A; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, February , 1993)
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Abstract:
Simultaneous elimination of specular reflection and backscattered
power from a plane metallic surface by simulated
corrugated surfaces of constant period and variable strip
width for TM polarisation is reported. This new configuration
offers almost a ten-fold frequency bandwidth compared
with a regularly spaced strip grating of the same size.
Rani, Joseph(Huthig & Wepf Verlag,Basel, April 16, 1993)
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Abstract:
Scrap latex products contain rubber hydrocarbon of very high quality, that is only
slightly crosslinked. A novel economic technique for converting such latex waste into
a processible material is developed. This paper reports the effect of adding this latex
reclaim to natural rubber. It is shown that latex reclaim can replace raw natural rubber
up to about 50 wt.% without affecting mechanical properties.
Ethylene-propylene-diene rubber (EPDM) and isobutylene-isoprene rubber (IIR) were
compounded, precured to a low degree, and then were blended with natural rubber (NR).
The compounding ingredients for NR were then added and the final curing was done. NR/
EPDM and NR/IIR blends, prepared using this method, were found to possess much
improved mechanical properties as compared to their conventional counterparts. The optimum
precuring crosslink density that has to be given to the EPDM and IIR phases has
been determined.
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; Sherly, K B; Devika Rani, G(React. Kinet.Catal.Lett., 1993)
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Abstract:
The limit of electron transfer in electron affinity from
the oxide surface to the electron acceptor (EA) are reported
from the adsorption of EA on DY203, mixed oxides
of DY203 with alumina and mixed oxides of Y203 with y-alumina.
The extent of electron transfer is understood
from magnetic measurements.
Rajasree, K; Vidyalal, V; Radhakrishnan, P; Nampoori, V P N; Vallabhan, C P G(IOP, 1993)
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Abstract:
The phenomenon of mirage effect suffered by a He-Ne laser beam has been utilized to detect phase transitions in solids. It has been observed that anomalous fluctuations of large amplitude occur in the signal level near the transition temperature. The mean square value of the fluctuation is found to exhibit a well-defined peak at this point. Results of measurements made in the case of crystals of TGS ((NH2CH2COOH)3.H2SO4) and a ceramic sample (BaTiO3) are given to illustrate this technique.
Rajasree, K; Vidyalal, V; Radhakrishnan, P; Nampoori, V P N; Vallabhan, C P G(American Institute of Physics, August 1, 1993)
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Abstract:
Laser‐induced damage and ablation thresholds of bulk superconducting samples of Bi2(SrCa)xCu3Oy(x=2, 2.2, 2.6, 2.8, 3) and Bi1.6 (Pb)xSr2Ca2Cu3 Oy (x=0, 0.1, 0.2, 0.3, 0.4) for irradiation with a 1.06 μm beam from a Nd‐YAG laser have been determined as a function of x by the pulsed photothermal deflection technique. The threshold values of power density for ablation as well as damage are found to increase with increasing values of x in both systems while in the Pb‐doped system the threshold values decrease above a specific value of x, coinciding with the point at which the Tc also begins to fall.
Ponnachan,P T C; Paulose,C S; Panikkar,K R(Department of Biotechnolgy, 1993)
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Abstract:
Alloxan induced diabetic animal model was
used to evaluate the antidiabetic effect of alkaloids
extracted from the leaves of Aegis marine/ose. The
alkaloid extract maintained the weight of animals
near to that of control ones - whereas there was a
decrease in the body weight of diabetic animals. A
significant increase in blood glucose (342. 14 -+-
14.89 mg/dl) was seen in diabetic animals but in
alkaloid treated group the blood glucose was lowered
(90: 12 +_5.81 mg/dl). There was no decrease in
blood urea arid sreum cholesterol in the alkaloid
treated group of diabetic animals. The liver
glycogen decreased in diabetic animals (1.27+.12
g/100g of wet tissue) and the treatment brought the
glycogen level to that of control ones (2.51 +.75
g/100 g of wet tissue). The result show that the
alkaloid extract has hypoglycaemic activity.
Sugunan, S; Sherly, K B(Indian Journal of Chemistry, August , 1993)
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Abstract:
The electron donating properties of La2O3 activated at 300, 500 and 800·C and its mixed oxides with
alumina are reported from the studies on adsorption of electron acceptors of varying electron affinity on
La203. The electron acceptors with their electron affinity values given in parenthesis are:
7,7,8,8-tetracyanoquinodimethane (2.84 eV), 2,3,5,6-tetrachloro-I,4-benzoquinone (2.40 eV) and
p-dinitrobenzene(l.77eV). The basicity of the oxide has been determined by titration with n-butylamine and
Ho.max values are reported. The limit of electron transfer from the oxide to the electron acceptor is between
2.40 and 1.77 eV. It is observed that La203 promotes the surface electron properties of alumina without
changing its limit of electron transfer.