Waliaula Mola,P; Sudha,B; Paulose,C S(Department of Biotechnolgy, November , 1996)
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Abstract:
The effect of insulin on cell proliferation in vivo has been studied in hepatectomised
streptozotocin- diabetic rats. The extent of cell proliferation in sham and hepatectomized- control,
diabetic and insulin treated rats were monitored by determining DNA content and [3H]thymidine
incorporation into DNA. The kinetic parameters of thymidine kinase a regulatory enzyme for
DNA synthesis was also studied in these groups. The rate of DNA synthesis in liver of
streptozotocin -diabetic rats was significantly higher 24 hrs post-hepatectomy compared to
control and insulin treated diabetic groups. Kinetic studies of thymidine kinase revealed that there
was no change in the Michaelis -Menten constant (Km) whereas maximum velocity (Vmax) was
elevated in the diabetic hepatectomized groups compared to control and insulin treated
hepatectomized groups. Thus our study elucidates the role of insulin in thymidine kinase activity
and DNA synthesis.
The morphological and biochemical response of calli and seedlings of different
rice cultivars were compared under acid saline conditions. Calli of
both tolerant and sensitive varieties showed severe stress symptoms like
browning and necrosis, but the onset of stress symptoms was delayed in
Pokkali. Seedlings of Pokkali showed minimal stress symptoms in lower
salinities, and curling and senescence of older leaves in higher salinities
although plants revived on amelioration of stress. Seedlings of the other
varieties showed severe stress symptoms even at low salinities and plant
death at higher salinities. Salt stress induced accumulation of the putative
osmoprotectant proline in calli and seedlings of all varieties. Proline accumulation
was higher in sensitive varieties than in Pokkali. These results
indicate that proline accumulation is not directly correlated with salt
tolerance in rice.
Rani, Joseph(OPA (Overseas Publishers Association), July 15, 1994)
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Abstract:
The mechanical properties of filled natural rubber latex vulcanizates were found to be improved by the
addition of polyethylene glycols of different molecular weight and glycerol. There is a slight reduction
in the optimum cure times of the compounds containing PEG/Glycerol. The morphology study shows
that the filler distribution is more uniform in the compounds containing PEG/Glycerol.
Aanandan,C K; K G Nair; Mohanan,P; Jacob,George(Department of Electronics, November , 1998)
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Abstract:
A new compact microstrip antenna element is analyzed.
The analysis can accurately predict the resonant frequency,
input impedance, and radiation patterns. The predicted results
are compared with experimental results and excellent agreement
is observed . These antenna elements are more suitable in applications
where limited antenna real estate is available
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.
Somatic embryos were induced from scutellar callus of immature zygotic embryos of T aestivum cv.
Chinese Spring. Observations on precociously germinating somatic embryos revealed that: (i) In the initial
stages the coleoptile is split, exposes the shoot apex and forms a green trichomatous leafy structure.
In the germinating zygotic embryo, the coleoptile is tubular, (ii) Unlike what has been inferred earlier the
leafy structure is the coleoptile and not the scutellum, (iii) Bipolarity of the embryoid is established later
when root develops at the basal end.
K G Nair; Aanandan,C K; Mohanan,P(Department of Electronics, 1990)
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Abstract:
A microstrip antenna with large bandwidth is developed
using a parasitic technique. Compared to the available wide-band antenaas,
the proposed antenna structure Is very compact and gives a less
distorted radiation pattern with frequency . An impedance bandwidth,
eight times that of a conventional patch antenna of the same size, Is
achieved. The concept of coupled microstrip line model is extended for
theoretical interpretation of the impedance Loci
Aanandan,C K; K G Nair; Mohanan,P(Department of Electronics, October , 1990)
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Abstract:
A microstrip antenna with large bandwidth is developed
using a parasitic technique. Compared to the available wide-band antenaas,
the proposed antenna structure Is very compact and gives a less
distorted radiation pattern with frequency . An impedance bandwidth,
eight times that of a conventional patch antenna of the same size, Is
achieved. The concept of coupled microstrip line model is extended for
theoretical interpretation of the impedance loci
Mohanan,P; Aanandan,C K; K G Nair(Department of Electronics, 1990)
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Abstract:
A microstrip antenna with large bandwidth is developed
using a parasitic technique. Compared to the available wide-band antenaas,
the proposed antenna structure Is very compact and gives a less
distorted radiation pattern with frequency . An impedance bandwidth,
eight times that of a conventional patch antenna of the same size, Is
achieved. The concept of coupled microstrip line model is extended for
theoretical interpretation of the impedance Loci