Different Locations Of Bangladesh Research Articles

Wind Power: A Renewable Alternative Source of Green Energy

Mean wind speed Wind power Green energy Weibull’s distribution Available power In the study, the statistical analysis of wind speed data has been carried out for different locations of Bangladesh over the period of ten years from 1998 to 2007. The hourly measured wind speed data above 30 m height has been collected from Bangladesh meteorological department and sorted in sequence of appropriate frequency like hourly, daily, monthly and annually. The data has been fitted for Weibull’s distribution and determined two important parameters like Weibull’s shape factor and Weibull’s scale factor by three methods and compared to each other. The theoretical available power in Watt/m2 has been determined for the prospective wind sites. It also determined the practically extractable Power by wind turbine in Watt/m2. Finally, it has been found that the available power in the wind can be used for lifting water for irrigation purpose in the dry season.

Rapd Analysis of Trichoderma Isolates for Superior Selection for Biopesticide Preparation

Thirty five isolates of Trichoderma species collected from seven different locations of Bangladesh were studied for morphological characters and molecular variation. Mycelial diameters of the isolates varied from 8.28 cm to 9.00 cm. Based on colony colour, isolates were grouped into five such as dark green, green, light green, yellowish green and whitish green. Maximum isolates were green and light green. On the basis of growth habit and colony consistency, the isolates were categorized into three groups, in which most species had fast growth and were compact in appearance. PCR-based Random Amplified Polymorphic DNA (RAPD) technique employing 3 decamer primers produced 36 scorable bands of which all (100%) were polymorphic. The co-efficient of gene differentiation (Gst) was 1.0000 reflecting the existence of high level of genetic diversity among the isolates. The Unweighted Pair Group Method of Arithmetic Means (UPGMA) dendrogram constructed from Nei's (1972) genetic distance produced 2 main clusters (13 isolates in cluster 1 and 22 isolates in cluster 2). The result indicating their genetic diversity has opened new possibility of using the most efficient and more isolates of Trichoderma in the preparation of biopesticide and decomposition of municipality waste.

Prevalence of seed-borne fungi in sorghum of different locations of Bangladesh

Fungi associated with sorghum (Sorghum vulgare) seeds collected from eight different locations viz. Jamalpur, Kushtia, Mymensingh, Pabna, Rajbari, Rajshahi, Savar and Sherpur of Bangladesh were detected by Blotter method. About 36% of the sorghum seeds were infected by different species of fungi obtained from the selected locations and nine different fungi identified in order of prevalence, were- Curvularia lunata, Fusarium moniliforme, Alternaria tenuis, Bipolaris sorghicola, Colletotrichum graminicola, Botrytis cinerea, Aspergillus niger, Penicillium oxalicum and A. flavus. Of all these fungi, the most predominant fungus was C. lunata (17.4%). The other predominant fungi were F. moniliforme (16.2%), A. tenuis (15.7%), B. sorghicola (11.4%), C. graminicola (11.3%) and B. cinerea (10.0%). The fungi varied in prevalence with respect to location of seed collection. No definite relationship between germination and seed-borne fungal infection was observed.

Radioactivity in Drinking Water of Bangladesh

The activity concentration levels of 232Th, 238U, 40K and 137Cs in drinking water of different locations of Bangladesh were measured by using a high purity germanium (HPGe) detector. The average activity levels with one standard deviation (1σ) of 232Th, 238U and 40K were found to be 250±52mBq/L-1, 157±30mBq/L-1 and 9±3Bq/L-1, respectively. The 137Cs was detected only in 32% samples with an average 4±0.8Bq/L-1. A good correlation between the activities of 232Th and 238U was found. The radium equivalent activity (Raeq) and the representative level index (Iγr) due to natural radionuclides were also calculated. The average Raeq was found to be 1, 212±303mBq/L-1 and the average Iγr was found to be 10±3mBq/L-1. The annual individual committed effective dose (HE) due to intake of radionuclides in water was also evaluated and the average value was found to be 74±21μSv. The distribution of radionuclides was found to be normal except 137Cs. The radioactivity levels of these radionuclides were comparable to the corresponding reported values of drinking water of different countries. The results presented in this study may helpful in establishing a regulatory limit on radioactivity in drinking water in Bangladesh.

Effect of different factors on pre-weaning survivability of Black Bengal kids

Survivability of Black Bengal kids produced in four different locations of Bangladesh was studied. Records on 892 kids born over a period from 1987 to 1991 were included. Data were analysed considering the fixed effects as region, parity, birth type, sex, season and year. Overall survival rates during birth -1, 1–2, 2–3 and birth -3 months of age were 84.4 ± 1.9, 91.3 ± 1.6, 95.9 ± 1.1 and 71.7 ± 2.4%, respectively. Regional effect on birth weight was significant ( P < 0.05) for the period from birth to 3 months having highest survival rate in Region 1 (76.9 ± 1.4) and lowest for Region 4 (61.1 ± 5.5). Effect of parity was insignificant but survivability increased gradually with the increase in parity number having the highest survival rate in the 5th parity. Birth weight of kids and milk yield of dams had a relationship with survivability during the pre-weaning period. It was evident that survivability of kids increased with the increase of birth weight of kids and milk yield of dams. Season had a significant effect ( P < 0.01) on survival rates of kids, with the highest survivability in the rainy season and the lowest in summer. Type of birth had no significant effect on survival rates but single kids always had a higher survival rate than twins and triplets. Effect of sex was significant ( P < 0.01) for birth -1 and birth -3 months of age, male kids having a higher survival rate than females. Year had a significant effect ( P < 0.01) on survival and increased gradually with advancing months. Lower birth weights, dams with insufficient milk and lack of husbandry knowledge were considered the main factors responsible for higher kid mortality.

Serological Detection of Four Plant Viruses in Cucurbitaceous Crops from Bangladesh.

In all 21 samples of various cucurbitaceous crops showing virus disease-like symptoms were collected in 1986-87 from different locations of Bangladesh and preserved at 4°C after lyophilization or with calcium chloride. These dried samples were used for serological detection of different cucurbit-viruses, viz., cucumber mosaic virus (CMV), papaya ringspot virus (PRSV/WMV 1), watermelon mosaic virus 2 (WMV 2), zucchini yellow mosaic virus (ZYMV), cucumber green mottle mosaic virus (CGMMV) and squash mosaic virus (SqMV) by double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) and dot-immunobinding assay (DIBA) in 1989. Out of the 21 samples tested, two, nine, one and three were found to be positive against the antisera of CMV, PRSV, WWV 2 and SqMV, respectively. None of the samples reacted positively against the antisera of ZYMV and CGMMV. Some samples of bottlegourd, bittergourd, cucumber and pumpkin did not react with any of the antisera used.

Determination of genetic variations among different &lt;i&gt;Trichoderma&lt;/i&gt; isolates using RAPD marker in Bangladesh

Some Trichoderma isolates were collected from different locations of Bangladesh for evaluating their bioefficiency by determining their genetic variations. PCR-based Random Amplified Polymorphic DNA (RAPD) Marker employing 3 decamer primers produced 29 scorable bands of which all (100%) were polymorphic. The co-efficient of gene differentiation (Gst) was 1.0000 reflecting the existence of high level of genetic diversity among the isolates. The Unweighted Pair Group Method of Arithmetic Means (UPGMA) dendrogram constructed from Nei’s (1972) genetic distance produced 2 main clusters (16 isolates in cluster 1 and 19 isolates in cluster 2). The result indicating their genetic diversity has opened new possibility of using the most efficient and more isolates of Trichoderma in the preparation of effective biopesticide. Keywords: Genetic diversity; Trichoderma; RAPD DOI: http://dx.doi.org/10.3329/jbau.v9i1.8738 JBAU 2011; 9(1): 9-20