A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Noor Alam, Md.
- Stratigraphic and Structural Features of the Surma Basin and the Upliftment of the Madhupur Tract of Northeastern Bengal Basin
Authors
1 Bangladesh Petroleum Institute (BPI), Sector # 8, Plot # 5A, Uttara Model Town, Dhaka-1230, BD
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1319-1327Abstract
The structural features developed under the influence of regional tectonics that in turn controls the seismo-stratigraphy in the northeastern part of Bangladesh have been illustrated in this paper. Almost all prominent seismo-stratigraphic horizons represented by continuous, high amplitude reflections that extend over a fairly large distance were identified, traced, and mapped. Interpreted sections reveal the structures and arrangement of the Tertiary-Quaternary succession in the Bengal Basin area while the areal extent maps of the youngest eight prominent seismo-stratigraphic horizons revealed a fair picture on the relative distribution of the near-surface stratigraphic horizons developed under the influence of associated tectonics in the northeastern part of Bengal Basin.
Two interpreted composite seismic sections across the Barind Tract and the Madhupur Tract reveal that, they belong to different seismo-stratigraphic horizons where the Barind Tract seems to correlate with the older seismic horizons than the Madhupur Tract. Structurally the exposure of the Madhupur Tract coincides with the crestal part of a low amplitude, broad anticlinal fold with it's NW-SE trending axis stretching along Sariakandi in Bogra District to Bhuapur in Tangail District and further southeast towards Lalmai. A similar pattern is observable on the LANDSAT imagery of Bangladesh. This broad anticlinal feature separates spatial distribution of some of the Pleistocene and younger sedimentary horizons of the Surma Basin from that of the Faridpur Trough as well as south of the Barind Tract.The composite areal extent map mostly comprising seven youngest seismo-stratigraphic horizons of the Quaternary sequence in the Surma Basin is representative of their inter-relationship. The areal extent of these horizons gradually decrease with time and dip towards their common depocenter near Tangua-Raular Bils (Marsh) north of Madhyanagar Thana in Sunamganj District. The Tangua-Raular Bils (Marsh) coincides with the axis of a broad synclinal fold between the Madhupur Tract and the Chhatak anticline where the Pleistocene formation has undergone a continuous subsidence of about 2 km during post-Pleistocene time. These sediments were probably deposited in a fluvio-lacustrine environment. The Quaternary sediments have excellent developments in this area and therefore can be considered as type locality for the Quaternary deposits in the Bengal Delta. On the other hand the Quaternary sediments on the west and southwest of the Madhupur Tract and that south of the Barind Tract were deposited in a rather active deltaic environment and were severely affected by river erosion. These sediments most probably have been brought in by the river Ganges and its tributaries and distributaries and the delta prograded rapidly towards the Bay of Bengal to the south.
Keywords
Seismogeology, Madhupur Tract, Surma Basin, Bengal Basin, Bangladesh.- Toxic Effects of Some Pesticides on Fingerlings of a Carp, Labeo rohita
Authors
1 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 9, No 3 (2010), Pagination: 633-637Abstract
The present paper deals with evaluation of acute toxicity of some popular and widely used insecticides like Endosulfan (O.C.), Malathion, Nuvacron, Nuvan, Dimecron (all O.P.) and Fenvalerate (pyrethroid) to the fingerlings of a carp, Labeo rohita. Among these insecticides Fenvalerate was found to be most toxic followed by Endosulfan, Malathion, Nuvacron, Dimecron and Nuvan, with their LC50/96 hr values in the order: 0.20ppm < 0.4ppm < 0.75ppm < 1.00ppm < 1.25ppm < 5.0ppm respectively. Accordingly, the acute toxicity of these insecticides was found in order: Nuvan < Dimecron < Nuvacron < Malathion < Endosulfan < Fenvalerate. Suggestive measures include use of insecticide around fishery resources with precaution so that access of sprayed chemicals into the adjoining water bodies may be checked.Keywords
Pesticides, Toxic Effects, Fingerlings, Labeo rohita.- Pollutional Effect of a Pesticide Bayrusil on Bimodal Oxygen Consumption in an Air Breathing Fish, Heteropneustes fossilis (Bloch.)
Authors
1 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 8, No 3 (2009), Pagination: 529-532Abstract
In the present investigation an attempt has been made to assess bimodal oxygen consumption in an air-breathing fish, Heteropneustes fossilis (Bloch.) under bayrusil (Quinalphos) exposure. The treatment of the fish with bayrusil brought significant decrease in total oxygen uptake as compared to the control but oxygen consumption through aerial route increased significantly in bayrusil treated fish. The increased dependency on aerial respiration might be due to avoidance of fish with the aquatic medium containing the toxicant.Keywords
Pollutional Effect, Pesticide, Bayrusil, Oxygen Consumption, Heteropneustes fossilis.- Toxicity of Parathion to a Freshwater Fish, Channa gachua (Ham.)
Authors
1 Department of Zoology, St. Columba’s College, Hazaribag, Jharkhand, IN
2 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 8, No 1 (2009), Pagination: 77-80Abstract
The present research work is oriented to find out toxic effects of an organophosphate insecticide, parathion on a freshwater fish, Channa gachua. By following standard procedures for toxicity determination, it was found that 34.0, 33.0, 32.0 and 31.0 ppm of the parathion formed 24 h, 48 h, 72 h and 96 hours LC50 doses, whereas LC0 and LC100 doses were 21.0 and 35.0 ppm respectively showing toxic nature of the insecticide.Keywords
Parathion, Toxicity, Channa gachua, LC50.- Studies on Toxicity of some Agricultural Chemicals to Tadpoles of Frog, Rana tigrina
Authors
1 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 8, No 1 (2009), Pagination: 151-156Abstract
The present investigation is aimed to study the toxic effects of three agro-chemicals, endosulfan, indofil and dhanusan-50 on the tadpoles of Indian bullfrog, Rana tigrina. By following standard procedure for toxicity determination, it has been found that 96 hr/ LC50 value of endosulfan was 1.5ppm, whereas for that of indofil and dhanusan-50, it was respectively 6.5 ppm and 8.0 ppm showing that endosulfan was most toxic and dhanusan-50 was least toxic. Some remarkable changes in the behaviour of the tadpoles in the toxic media of all the three agro-chemicals were observed such as agitated movement, hyperexcitability, bending and looping of body, surfacing movement, muscular weakness and finally death. The loss of these fish-food organisms have consequent effects on the ecosystem because of interrelationship of the organisms in the sense of food chain, and this adverse situation is destined to have an impact on the prospects of fish yields from the contaminated water areas.Keywords
Agricultural Chemicals, Rana tigrina, Tadpoles, Endosulfan, Indofil, Dhanusan-50.- Studies on Physicochemical Status of Two Ponds at Patna in Relation to Growth of Fishes
Authors
1 Department of Zoology, College of Commerce, Patna-800 020, Bihar, IN
2 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 7, No 4 (2008), Pagination: 729-732Abstract
Physicochemical characteristics of two ponds at Patna were studied for a period of one year in 2004-05. The investigation was focused on the determination of water quality parameters such as temperature, pH, DO, alkalinity, nitrite, nitrate and other factors showing that the water quality of these ponds comply with suitability of growth of some fishes.Keywords
Fish Ponds, Physicochemical Status, Fish Growth, Correlation Analysis.- Pollutional Potency of the Insecticide, Bayrusil with Respect to Mortality and Behaviour of Heteropneustes fossilis (Bloch)
Authors
1 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 7, No 3 (2008), Pagination: 513-516Abstract
The paper deals with the effect of an agro-chemical, Bayrusil on the mortality and behaviour of a catfish Heteropneustes fossilis. It was inferred from the experiment that 38.0 and 41.0 ppm of the insecticide represented LC50 and LC100 doses respectively showing acutely toxic nature of the pesticide. Some remarkable changes were also observed in the fish in pesticidal media, such as thrilling and bending of body, jerky movement, surfacing and gulping air, dashing against the wall of container, frequent jumping, loss of balance, muscular weakness and finally death.Keywords
Agro-Chemicals, Bayrusil, Heteropneustes fossilis, Bioassay Test, Behavioural Responses, LC50.- Studies on the Effects of Some Air Pollutants on Blood Characteristics of Human Population of Katras-Dhanbad Coal-Field Area
Authors
1 Department of Zoology, Vinoba Bhave University, Hazaribagh-825 301, Jharkhand, IN
2 Department of Zoology, Giridih College, Giridih-815 301, Jharkhand, IN
Source
Nature Environment and Pollution Technology, Vol 6, No 4 (2007), Pagination: 719-723Abstract
Effects of certain air pollutants on the peripheral blood of human population of Katras-Dhanbad area of Jharkhand state have been studied in this paper. People living in this area have suffered a lot due to pollutional effects in respect to changes in R.B.C. count, haemoglobin percentage and E.S.R.- Effects of Dust and Suspended Particulate Matter on Some Haematological Characters of the Human Population of Katras-Dhanbad Coal Field Area
Authors
1 P.G. Dept. of Zoology, Vinoba Bhave University, Hazaribag, Jharkhand, IN
2 Dept. of Zoology, Giridih College, Giridih-815301, Jharkhand, IN
3 Dept. of Zoology, St. Columba’s College, Hazaribag, Jharkhand, IN