354 research outputs found
Risk Assessment of Low Level Radioactive Waste In Near Surface Disposal Facilities
No full textIn this paper, a radiological model for the risk assessment is developed for the near surface disposal facilities of Cesium, Strontium and Cobalt. In addition to the time-dependent annual release rate and dose rate of the radionuclides, the risk to the critical individual is also estimated. The results show that the highest value of annual dose rate is less than the dose limit to the critical individual. The highest value of dose rate appears at about 200years, and at this time, dominant radionuclides are Cs-137 and Sr-90. The risk obtained is much lower than the specified tolerable risk
Methodologies for studying finfish and shellfish biology
No full textGlobal warming and consequent increase in seawater
temperature are likely to play key roles in the distribution,
abundance, phenology and recruitment success of marine
will alter species composition; structure and function of
in India has shown steady increase over the years, it is now
facing several sustainability issues such as the production approaching potentia
Allometric relationships of short neck clam Paphia malabarica from Dharmadom estuary, Kerala
No full textLength weight relationship and other allometric relationships
were studied for shortneck clam Paphia malabarica. Lengthweight
and total weight-flesh weight relationship in males and
females were significantly different (p <0.01). The rate of
growth in all other relationship studied were not significantly
different between sexes. In length- weight relationship it
showed isometric growth and in length-width and length-depth
it showed negative allometric growth. The determination
coefficient (r2) was higher in length-depth than in length-width
relationship indicating that the shell growth in depth is less
variable than shell growth in width and negative allometry
indicates that width and depth increase are inferior to length
increase
Combined impact of exercise and temperature in learning and memory performance of fluoride toxicated rats
No full textIn previous studies, we investigated a link between high fluoride exposure and functional IQ deficits in rats. This study is an extension conducted to explore the combined influence of physical exercise and temperature stress on the learning ability and memory in rats and to assess whether any positive modulation could be attenuated due to exercise regimen subjected to F-toxicated animals at different temperatures. Accumulation of ingested fluoride resulted significant inhibition in acetylcholinesterase activity (P < 0.05), plasma cortisol levels (P < 0.05), and impaired the acquisition, performance, latency time, and retention in fluoride-exposed animals. Fluoride-toxicated rats took more number of sessions during the learning phase F 5, 35 = 19.065; P < 0.05 and post hoc analysis on the number of correct choices revealed that there was a significant effect of treatments F 5, 30 = 15.763; P < 0.05; sessions F 8, 240 = 58.698; P < 0.05; and also significant difference in the interactions F 40, 240 = 1.583; P < 0.05. The latency data also revealed a significant difference between groups F 5, 30 = 28.085; P < 0.05; time = F 8, 240 = 136.314; P < 0.05; and there was a significant difference in the interactions F 40, 240 = 2.090; P < 0.05. In order to ascertain if interdependence between fluoride concentrations and the foregoing free radical parameters, respective correlation coefficients were calculated and results clearly emphasize the positive role of exercise in the promotion of cognitive functions by decreasing fluoride levels in rat hippocampus. A significant recovery in cognitive function was noticed in all the exercised animals due to reduced burden of brain oxidative stress. In comparison to exercise regimens performed at different temperatures, high (35 °C) and low temperatures (20 °C) led to a slower acquisition and poor retention of the task when compared to thermo neutral temperatures (25 and 30 °C). Thus exercise up-regulate antioxidant defenses and promote learning abilities in fluorotic population. © 2012 Springer Science+Business Media, LLC
Impaired Cognition – A Menace to Aging
No full textCognition is defined as mental process of acquiring knowledge and understanding through thought, experience and senses. It is an age-related degenerative condition, as the age advances, individuals experience deteriorative changes in their cognitive abilities. It is estimated that nearly four fifth of the elderly above 60 years of age will be living in developing countries like Africa, Asia by 2050, thereby placing the developing countries to face threat of cognitive impairment among elderly when compared to developed countries. The result of striking increase in ag-ing population of India, it is expected to have a substantial increase in elderly suffering from cognitive impair-ment. This review involves discussing the various causes, pathophysiology, modifiable and non-modifiable risk factors associated with this increasing cognitive deterioration in elderly people, diagnostic criteria, and preven-tive methods. This review will help in better understanding of the cognitive impairment in elderly people. Better understanding of the disease helps in better treatment modalities
Not Available
No full textNot AvailableLength weight relationship and other allometric relationships
were studied for shortneck clam Paphia malabarica. Lengthweight
and total weight-flesh weight relationship in males and
females were significantly different (p <0.01). The rate of
growth in all other relationship studied were not significantly
different between sexes. In length- weight relationship it
showed isometric growth and in length-width and length-depth
it showed negative allometric growth. The determination
coefficient (r2) was higher in length-depth than in length-width
relationship indicating that the shell growth in depth is less
variable than shell growth in width and negative allometry
indicates that width and depth increase are inferior to length
increase.Not Availabl
Reproductive studies on the short neck clam Paphia malabarica (Chemnitz) from Dharmadom Estuary, Kerala, India
No full textMaturation and spawning of the short neck clam Paphia malabarica was studied from Dharmadom Estuary, in northern Kerala, India. The breeding season was from October to February, with peak spawning in November and December. Sexual activity commenced from March onwards and lasted till September. The peak somatic period was from February to April when more numbers of indeterminates appeared in the population. There was not much difference in the size at maturity (Lm) for females and males; Lm was estimated to be 20 mm for females and 22 mm for males. Chi-square test indicated that the sex ratio differed significantly (p<0.01) from the theoretical 1:1 ratio, only in the month of May. The abundance of mature clams showed positive correlation with salinity and negative correlation with temperature
Not Available
No full textNot AvailableMaturation and spawning of the short neck clam Paphia malabarica was studied from Dharmadom Estuary, in northern Kerala, India. The breeding season was from October to February, with peak spawning in November and December. Sexual activity commenced from March onwards and lasted till September. The peak somatic period was from February to April when more numbers of indeterminates appeared in the population. There was not much difference in the size at maturity (Lm) for females and males; Lm was estimated to be 20 mm for females and 22 mm for males. Chi-square test indicated that the sex ratio differed significantly (p<0.01) from the theoretical 1:1 ratio, only in the month of May. The abundance of mature clams showed positive correlation with salinity and negative correlation with temperature.Not Availabl
Not Available
No full textNot AvailableMaturation and spawning of the short neck clam Paphia malabarica was studied from Dharmadom Estuary, in northern Kerala, India. The breeding season was from October to February, with peak spawning in November and December. Sexual activity commenced from March onwards and lasted till September. The peak somatic period was from February to April when more numbers of indeterminates appeared in the population. There was not much difference in the size at maturity (Lm) for females and males; Lm was estimated to be 20 mm for females and 22 mm for males. Chi-square test indicated that the sex ratio differed significantly (p<0.01) from the theoretical 1:1 ratio, only in the month of May. The abundance of mature clams showed positive correlation with salinity and negative correlation with temperature.Not Availabl
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