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Hydraulic parameters and morphometric variables interactions in bedrock channel

100%

Biswas B., Das B. C.

Quaestiones Geographicae

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2016

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tom 35

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nr 3

Present study is on the interdependent nature of hydraulic parameters and morphometric variables of a bedrock river. In this study, using dumpy level, GPS, satellite images and some mathematical equations a data set on hydraulics and morphometric variables of a bedrock channel, named Bhatajhor, of eastern India was generated. That data set was used to (1) find out impulse-response relations between hydraulic variables (2) find out relations between morphometric variables and (3) find out relations between hydraulic and morphometric variables. Seven equations (5–11) were formulated based on this empirical study to the end. The seven empirical relations, most of which include only two variables, involve channel cross-section dimensions (area, width, mean depth, maximum depth, width/depth ratio, hydraulic radius), slope and hydraulic variables (velocity, kinetic energy, stream power, Manning’s n factor, Chezy’s C factor and shear stress). Observation shows relatively higher coefficient of determination (R2) between variables like velocity and Manning’s n factor (0.67), velocity and Chezy’s C factor (0.67), slope and τ (0.89), w/d ratio and hydraulic radius (0.53), slope and w/d ratio (0.50).

2

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Trend analysis of climate change in Chittagong Station in Bangladesh

81%

Roy M., Biswas B., Ghosh S.

International Letters of Natural Sciences

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2015

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tom 47

The amount of rainfall received over an area is an important factor in assessing availability of water to meet various demands for agriculture, industry, irrigation, generation of hydroelectricity and other human activities. Over the study period of recent 30 years, trend values of monsoon average rainfall in Chittagong have increased. This paper has measured the correlation coefficients between rainfall and time for Chittagong, where correlation coefficient for Chittagong is positive. In order to check the strength of linear relationship between rainfall and time, P-value has been measured. Due to various factors of Chittagong region of Bangladesh, there is a growing need to study the rainfall, temperature and humidity pattern. This study was checked annual average rainfall of 30 years, temperature of 60 years and humidity of 28 years for this region. It is hoped that this research may be of help to the concerned organizations and experts working on increasing climate variation in Chittagong.

3

Properties of mitochondrial DNA polymerase in mitochondrial DNA synthesis in yeast

61%

Biswas T. K., Sengupta P., Green R., Hakim P., Biswas B., Sen S.

Acta Biochimica Polonica

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1995

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tom 42

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nr 3

Mitochondrial DNA polymerase from Saccharomyces cerevisiae, purified 3500 fold, was separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis into three polypeptides. The major 150 kDa polypeptide was probably the catalytic subunit of the mitochondrial (mt) DNA polymerase and the other two polypeptides could be either proteolytic cleavage products of the polymerase, other subunits of the enzyme or protein contaminants. The mtDNA polymerase preferred an A+T-rich DNA template and did not require any RNA primer for DNA synthesis, at least under in vitro reaction conditions. It showed higher processivity on a double-stranded linear DNA template than on a single-stranded circular DNA template, and was capable of synthesizing at least about 1200 nucleotide primer-extended products without any major pause on a double-stranded DNA template.

Ograniczanie wyników

1 Acta Biochimica Polonica

1 International Letters of Natural Sciences

1 Quaestiones Geographicae

3 Biswas B.

1 Biswas T. K.

1 Das B. C.

1 Ghosh S.

1 Green R.

1 Hakim P.

1 Roy M.

1 Sen S.

1 Sengupta P.

1 2016

1 2015

1 1995

Hydraulic parameters and morphometric variables interactions in bedrock channel

Trend analysis of climate change in Chittagong Station in Bangladesh

Properties of mitochondrial DNA polymerase in mitochondrial DNA synthesis in yeast