The performance of a low cost and simple ceramic filter to a membrane bioreactor (MBR) process wa... more The performance of a low cost and simple ceramic filter to a membrane bioreactor (MBR) process was evaluated for greywater treatment. The ceramic filter was submerged in an acrylic cylindrical column bioreactor. Synthetic greywater (prepared by shampoo, dish cleaner and laundry detergent) was fed continuously into the reactor. The filter effluent was obtained by gravitational pressure. The average flux performance was observed to be 11.5 LMH with an average hydraulic retention time of 1.7 days. Complete biodegradation of surfactant (methylene blue active substance removal: 99–100%) as well as high organic removal performance (biochemical oxygen demand: 97–100% and total organic carbon: >88%) was obtained. The consistency of flux (11.5 LMH) indicated that the filter can be operated for a long time without fouling. The application of this simple ceramic filter would make MBR technology cost‐effective in developing countries for greywater reclamation and reuse.
Background: Bambara groundnut is an edible legume which is highly nutritious. This study was carr... more Background: Bambara groundnut is an edible legume which is highly nutritious. This study was carried out to find the effect of inorganic and organic fertilizer on the growth, nodulation, nitrogen yield and nutritional composition of bambara groundnut (Vigna subterranea).Methods: During the period of 2018, a glasshouse experiment was conducted in a randomized complete block design (RCBD) at Ladang 15, Faculty of Agriculture, Universiti Putra Malaysia. Different rates of compost, biofertilizer, gypsum were used along with the combination of different rates of nitrogen (N) and phosphorus (P) fertilizer. The amino acid content of the seed was measured by HPLC.Result: N and P fertilizer were found to play a dominating role in increasing the vegetative growth and yield of the plant. Plant height (21.73 cm), leaf area (2802.9 cm2) and the number of the pods per plant (41.75) increased with the application of N and P. Application of N30P60 kg/ha influenced nodule number (35.50) of the plant...
Highly pathogenic avian influenza (HPAI) causes enormous losses to the poultry industry of Bangla... more Highly pathogenic avian influenza (HPAI) causes enormous losses to the poultry industry of Bangladesh every year since the detection of first outbreak in 2007. In this study biomolecular diagnosis of avian influenza virus in Bangladesh from different species of birds was carried. A total of 1135 samples including 280 from migratory birds, 680 from live bird market (LBM) chickens, 118 from ducks and 57 from pigeons were collected from different locations of Bangladesh during the period from July 2013 to June 2014. Out of 1135 samples, 69 were found positive for influenza A by real time RT-PCR. In addition, 741 Influenza A positive samples collected by different institutes from different species of birds under the FAO-led surveillance program were also received at Bangladesh Livestock Research Institute (BLRI) for further analysis. The real time RT-PCR positive samples were inoculated in 10-day-old embryonated chicken eggs. Out of 810 (741+ 69) influenza A positive samples, 110 were selected on the basis of species and region to cover the whole country and were sent to the OIE reference laboratory for detailed study. The bio-molecular results revealed that in case of migratory bird samples one was H5 (HPAI), two were H9 and eight were of undetermined subtype. Among the LBM chicken samples, seven were H5 (HPAI), 51 were H9, six were mixed infection with H5 & H9 and three were of undermined subtype. In case of duck samples, one was H2, six were H4, six were H5 (HPAI), one with mixed infection with H5 & H2, one with both H5 & H4, two were H9 and one was H7N5, though H7 was genetically distinct from that of the novel H7N9 virus of China. Among quail samples, one was H5 (HPAI) and one was H9. In case of pigeon samples, all three contained H9. From this study it was revealed that HPAI (H5N1) is still circulating in our poultry population. The novel avian influenza virus H7N9 was not found during this study.
The study was conducted in the 20 upazila of 10 selected major potato growing districts of Bangla... more The study was conducted in the 20 upazila of 10 selected major potato growing districts of Bangladesh during the period from December 2014 to February 2015 to find out the present status and diversity of insect pests of potato, their risks and management options. The data were collected through interview of 60 field level officers of DAE including one UAO, one AEO and one SAAO. The data were analyzed using computer program SPSS 20 version. BARI Alu-7 (Diamant) variety and BARI Alu-8 (Cardinal) variety of potato were the most popular potato varieties used by the farmers for cultivation. The major sources of potato seeds used by the farmers for cultivation were the own produced seeds, BADC seeds, seed traders/dealers and neighboring farmers. Major problems faced during potato cultivation were diseases, insect pest attack and weed attack. The BARI Alu-7 (Diamant) and BARI Alu-8 were most susceptible potato varieties to insect pests and diseases, whereas the Lal-pakhri was the least susceptible to pests. Mostly (98.50%) the potato was infested in the field by cutworm, aphid, potato tuber worm, leaf miner, mole cricket, field cricket and leaf hoppers. Among these insect pests, cutworm and aphid were identified as major pests and caused damage with high and moderate infestation intensity, respectively. Others were identified as minor insect pests of potato caused damage with low infestation intensity. Mostly (73.50%) the potato tuber worm attacked potato tubers in storage and designated as a major insect pest of potato in storage and damaged potato with high infestation intensity. Currently cutworm and aphid were more damaging insect pest of potato in field condition than previous infestation, and potato tuber worm was more damaging insect pest in storage. Other important control options were application of flood irrigation and hand picking particularly for controlling cutworm, use of granular insecticides in furrows during planting of seed tubers. Most (95%) of the farmers received assistance and advices for controlling insect pests of potato from pesticide dealers. Other sources of services were DAE officials, neighboring farmers and NGO officials.
The Indonesian archipelago is an ideal setting for the study of speciation and biogeography. This... more The Indonesian archipelago is an ideal setting for the study of speciation and biogeography. This archipelago is divided into three island groups based on zoogeography: Sundaland, Wallaceaand the Australian region. In this paper we used frogs in genus Fejervarya (Bolkay) to study biogeography and examine patterns of gene flow across proposed zoogeographic boundaries. Severalmolecular studies on Fejervarya species from Indonesia have been carried out, but comparative studies among members of the genus Fejervarya have yet to be performed. In order to elucidate genetic divergence and geographic distribution of these frogs, we conducted a molecular analysis of the mitochondrial 16S rRNA gene using 179 frogs from five Fejervarya species. In total we collected from 32 localities in Sumatra, Kalimantan (Indonesian part of Borneo), Java, Bali, Sulawesi and Lesser Sunda Islands in Indonesia. Molecular phylogenetic analysis recovered 35 haplotypes and showed that frogs in the genus Fejervarya...
In this paper we address the problem of image fusion between imagery acquired by trichromatic sen... more In this paper we address the problem of image fusion between imagery acquired by trichromatic sensors and hyperspectral imagers. We do this by presenting a method aimed at registering a high-resolution trichromatic image with lower resolution hyperspectral data. The method presented here maps the hyperspectral image into the grayscale image so as to employ the cross cumulative residual entropy for purposes of multimodal registration. We illustrate the utility of our approach by presenting registration results on a set of surveillance image pairs consisting of a set of high-oblique colour and hyperspectral images.
2014 IEEE International Symposium on Signal Processing and Information Technology (ISSPIT), 2014
Numerous environmental sources of noise and distortion can degrade the quality of the speech sign... more Numerous environmental sources of noise and distortion can degrade the quality of the speech signal in a communication system. This study explores the effects of these intrusive sounds on speech applications and introduces some techniques for reducing the influence of noise and, enhancing the acceptability and intelligibility of the speech signal. In this paper, a noise reduction system uses single -microphone method in time domain to improve signal to noise ratio (SNR) of noise contaminated speech. In the early phase of noise reduction, the amount of noise is estimated from the valley of the spectrum based on the harmonic properties of noisy speech, called minimum value sequences (MVS). Therefore, we use the estimated degree of noise (EDON) [1] to adjust the amplitudes of the MVS. The base of the proposed method is to estimate noise continuously on a frame-by-frame basis without the aid of voice activity detector (VAD)[2]. This research uses single-channel adaptive filter (SAF) to reduce time and cost for maximum noise reduction. For this, we propose a minimum computational iteration number (CIN) and generated an equation from set values of SNR and EDON. By adopting the proposed iteration number, the planned system becomes computationally inexpensive and the signal resurgence difficulty is limited in the silent portion. To derive the proposed iteration number equation, we use the third degree parabola equation and least squares solution for the coefficients of EDON.
The River Buriganga, is a tide-influenced river, passing through the south-western edge of Dhaka ... more The River Buriganga, is a tide-influenced river, passing through the south-western edge of Dhaka city. The river has served as a nucleus to the commercial activities of Dhaka for over centuries. But due to acute human interference and industrial intrusion, both the flow and function of the river has been interrupted. For over last few decades, Buriganga River has been polluted indiscriminately by industrial discharge, domestic garbage, partially treated or untreated sewage, vessel fuel discharge etc. The situation is exacerbated by lack of proper waste management, operational effluent treatment plants. This study focuses on determining the resultant of the continuous pollution in terms of three selected water quality parameters. The parameters include pH, Biochemical Oxygen Demand (BOD5) and Ammonia-Nitrogen (NH3-N). In order to conduct the study, water samples were collected from five different sampling stations along the river Buriganga. All the samples were collected during the m...
American Journal of Biochemistry and Biotechnology, 2015
Snake venom is a mixture of many biological components. Snakes usually use their venomic armory t... more Snake venom is a mixture of many biological components. Snakes usually use their venomic armory to tackle different prey and predators in adverse natural world. Among various components of the snake venom, neurotoxins play an important role in exerting effect by blocking the neuromuscular transmission through selective binding to muscle nicotinic Acetyl-Choline Receptors (nAChR). A set of 30 reference protein sequences representing neurotoxin of snake venom were retrieved from NCBI protein database and characterized for various physic-chemical properties, Multiple Sequence Alignment (MSA), phylogenetic analysis and motifs election. The physic-chemical properties of the selected proteins were analyzed by using ExPASy's Prot Param tool and it was found that the Molecular Weight (M.Wt) of maximum proteins is around 10000 Da. Isoelectric points (pI) of all the organisms were found to be basic in nature. The aliphatic index infers that neurotoxins showed the tendency of having both wide and low range of temperature as 16 proteins showed AI above 70 and others showed AI value below 70. The negative value of GRAVY indicates that there will be better interaction with water. The secondary structure prediction was done by SOPMA which showed that random coils dominated all the other conformations. Multiple sequence analysis and Phylogenetic analysis of neurotoxins were carried out by MEGA 5. Motif election was done by MEME which represents motif 1 (21 sequences), Motif 2 (11 sequences), Motif 3 (3 sequences) and these indicates the region also indicates the DUF3963, Toxin_1 (PF008), CAP (PF0188) protein family respectively which was done by Pfam. Motif 2 gives the insight of functional domain for neurotoxins and also suggests the degenerate primer for neurotoxin protein family.
International Journal of Pharmacy and Biological Sciences
Objective: To investigate the therapeutic effects of ethanol extract and its fractions of Rhaphid... more Objective: To investigate the therapeutic effects of ethanol extract and its fractions of Rhaphidophora glauca leaves in anthelmintic (in vitro) and α-amylase inhibitory activity (in vitro). Methods: Leaves of Rhaphidophora glauca was extracted with pure ethanol and fractioned with chloroform (CHFRG), petroleum ether (PEFRG), n-hexane (NHFRG) and ethyl acetate (EAFRG), which are tested for anthelmintic activity on aquarium worm Tubifex tubifex by using three concentrations viz., 5, 10 and 20 mg/ml of each. α-amylase inhibitory activity estimated by modified starch iodine protocol. Result: Among the EERG and various fractions, PEFRG exhibited strong anthelmintic activity in vitro. Where it paralyzed (4.54±0.39 min) and produced death (8.37±0.86 min) of the Tubifex tubifex at 20 mg/ml dose near the value of the standard, Levamisole (3.3±0.38 min and 6.5±0.76 min) at 1 mg/ml. EERG and its all fractions showed good α-amylase inhibitory activity, but PEFRG [IC50=1.757±0.025mg/ml] showed ...
Exact solution of Einstein's field equations with variable cosmological constant is obtained ... more Exact solution of Einstein's field equations with variable cosmological constant is obtained in presence of bulk viscous barotropic fluid for Bianchi type-I space time. To get a determinate solution of the field equations the average scale factor 3 R , in the model is considered as a linear function of t and also the fluid obeys the barotropic equation of state. The physical aspects of the model with astronomical observations are discussed.
Background: The phytochemical screening of methanolic extract of Dalbergia stipulacea and Hymendi... more Background: The phytochemical screening of methanolic extract of Dalbergia stipulacea and Hymendictyon excelsum has indicated the presence of steroid, flavonoid and glycoside like antioxidative and cardioprotective compounds. Methods: Since these compounds are of pharmacological interest, we got curious to check D. stipulacea and H. excelsum for their possible anti-inflammatory activity by HRBC (Human Red Blood Cell) membrane stabilization method, anti-arthritic activity by the inhibition of protein Original Research Article
Quality assessment as well as hydrogeochemical characterization of 45 representative groundwater ... more Quality assessment as well as hydrogeochemical characterization of 45 representative groundwater samples around Umrer coal mine area was undertaken. The pH of the water lies in the normal range i.e. from 7.5 to 8.5, the electrical conductivity varies from 826 to 1,741, the total hardness varies from 289 to 1,302 and the TDS values range from 528.6 to 1,114.2 mg/l which reflects variation in lithology and thus, the distinction in hydrogeological regime. The cation chemistry is dominated by Ca 2? and Mg 2? while anion chemistry is dominated by Cland HCO 3-. Out of total ten hydrochemical facies, the two dominant facies are Mg-Ca-HCO 3 (37.7 %) and Ca-Mg-SO 4-HCO 3 (17.7 %). The groundwater in the study area, in general, is useful for drinking and domestic use; however, it has marginal utility for irrigation purpose. Standard US Salinity Laboratory classification shows that water of the study area belongs to C2-S1 and C3-S1 classes. The concentration of 9 trace elements analysed from 18 samples did not exceed the desirable limit.
2010 IEEE International Conference on Image Processing, 2010
In this paper we address the problem of image fusion between imagery acquired by trichromatic sen... more In this paper we address the problem of image fusion between imagery acquired by trichromatic sensors and hyperspectral imagers. We do this by presenting a method aimed at registering a high-resolution trichromatic image with lower resolution hyperspectral data. The method presented here maps the hyperspectral image into the grayscale image so as to employ the cross cumulative residual entropy for purposes of multimodal registration. We illustrate the utility of our approach by presenting registration results on a set of surveillance image pairs consisting of a set of high-oblique colour and hyperspectral images.
2014 IEEE Conference on Computer Vision and Pattern Recognition, 2014
Most of the state-of-the-art approaches to human activity recognition in video need an intensive ... more Most of the state-of-the-art approaches to human activity recognition in video need an intensive training stage and assume that all of the training examples are labeled and available beforehand. But these assumptions are unrealistic for many applications where we have to deal with streaming videos. In these videos, as new activities are seen, they can be leveraged upon to improve the current activity recognition models. In this work, we develop an incremental activity learning framework that is able to continuously update the activity models and learn new ones as more videos are seen. Our proposed approach leverages upon state-ofthe-art machine learning tools, most notably active learning systems. It does not require tedious manual labeling of every incoming example of each activity class. We perform rigorous experiments on challenging human activity datasets, which demonstrate that the incremental activity modeling framework can achieve performance very close to the cases when all examples are available a priori.
2010 International Symposium on Voronoi Diagrams in Science and Engineering, 2010
AbstractTremendous research activities took place on the proximity analysis of points and straig... more AbstractTremendous research activities took place on the proximity analysis of points and straight lines in three-dimensions using Voronoi diagrams. However, less attention has been paid to the proximity of curves in three-dimensions due to the complexity involved in ...
2009 Digital Image Computing: Techniques and Applications, 2009
AbstractFrequently the need arises to combine remotely sensed data taken from different sensors ... more AbstractFrequently the need arises to combine remotely sensed data taken from different sensors for improved interpretation of an imaged area. However, before this multi-sensor data fusion can be performed the image data must first be registered geometrically. In this paper we ...
The aim of the present study was to examine the antibacterial activity of methanol extract of pom... more The aim of the present study was to examine the antibacterial activity of methanol extract of pomegranate peels against some Gram positive and negative bacteria. The antibacterial activity was evaluated using both agar-diffusion method and minimum inhibitory concentration (MIC). With the exception of Streptococcus faecalis and Salmonella, all of the bacteria showed sensitivity to methanol extracts of pomegranate peel The Minimum Inhibitory Concentration varied with Streptococcus salivarius and Bacillus subtilis having the lowest MIC (1mg/ml) while Streptococcus faecalis and Salmonella where more resistant, having MICs of 4 and 8 mg/ml respectively.
Mastitis is a serious problem for the dairy cattle in many countries of the world including Bangl... more Mastitis is a serious problem for the dairy cattle in many countries of the world including Bangladesh. Among the microbial etiology bacteria plays a major role in the onset of the clinical form of the disease. Many of these bacteria are resistant to one or more antibiotics thus make the mastitis cases difficult to cure. In the present study Staphylococcus spp., Streptococcus spp., Bacillus spp. and E. coli were identified as the dominant bacterial species causing clinical mastitis in cattle in Mymensingh. Antibiogram study revealed chloramphenicol and erythromycin as the most effective antibiotic for the treatment of mastitis in these animals except those caused by Bacillus spp. and E. coli, respectively. Microbes and Health, June 2013, 2(1): 19-21DOI: http://dx.doi.org/10.3329/mh.v2i1.17258
The performance of a low cost and simple ceramic filter to a membrane bioreactor (MBR) process wa... more The performance of a low cost and simple ceramic filter to a membrane bioreactor (MBR) process was evaluated for greywater treatment. The ceramic filter was submerged in an acrylic cylindrical column bioreactor. Synthetic greywater (prepared by shampoo, dish cleaner and laundry detergent) was fed continuously into the reactor. The filter effluent was obtained by gravitational pressure. The average flux performance was observed to be 11.5 LMH with an average hydraulic retention time of 1.7 days. Complete biodegradation of surfactant (methylene blue active substance removal: 99–100%) as well as high organic removal performance (biochemical oxygen demand: 97–100% and total organic carbon: >88%) was obtained. The consistency of flux (11.5 LMH) indicated that the filter can be operated for a long time without fouling. The application of this simple ceramic filter would make MBR technology cost‐effective in developing countries for greywater reclamation and reuse.
Background: Bambara groundnut is an edible legume which is highly nutritious. This study was carr... more Background: Bambara groundnut is an edible legume which is highly nutritious. This study was carried out to find the effect of inorganic and organic fertilizer on the growth, nodulation, nitrogen yield and nutritional composition of bambara groundnut (Vigna subterranea).Methods: During the period of 2018, a glasshouse experiment was conducted in a randomized complete block design (RCBD) at Ladang 15, Faculty of Agriculture, Universiti Putra Malaysia. Different rates of compost, biofertilizer, gypsum were used along with the combination of different rates of nitrogen (N) and phosphorus (P) fertilizer. The amino acid content of the seed was measured by HPLC.Result: N and P fertilizer were found to play a dominating role in increasing the vegetative growth and yield of the plant. Plant height (21.73 cm), leaf area (2802.9 cm2) and the number of the pods per plant (41.75) increased with the application of N and P. Application of N30P60 kg/ha influenced nodule number (35.50) of the plant...
Highly pathogenic avian influenza (HPAI) causes enormous losses to the poultry industry of Bangla... more Highly pathogenic avian influenza (HPAI) causes enormous losses to the poultry industry of Bangladesh every year since the detection of first outbreak in 2007. In this study biomolecular diagnosis of avian influenza virus in Bangladesh from different species of birds was carried. A total of 1135 samples including 280 from migratory birds, 680 from live bird market (LBM) chickens, 118 from ducks and 57 from pigeons were collected from different locations of Bangladesh during the period from July 2013 to June 2014. Out of 1135 samples, 69 were found positive for influenza A by real time RT-PCR. In addition, 741 Influenza A positive samples collected by different institutes from different species of birds under the FAO-led surveillance program were also received at Bangladesh Livestock Research Institute (BLRI) for further analysis. The real time RT-PCR positive samples were inoculated in 10-day-old embryonated chicken eggs. Out of 810 (741+ 69) influenza A positive samples, 110 were selected on the basis of species and region to cover the whole country and were sent to the OIE reference laboratory for detailed study. The bio-molecular results revealed that in case of migratory bird samples one was H5 (HPAI), two were H9 and eight were of undetermined subtype. Among the LBM chicken samples, seven were H5 (HPAI), 51 were H9, six were mixed infection with H5 & H9 and three were of undermined subtype. In case of duck samples, one was H2, six were H4, six were H5 (HPAI), one with mixed infection with H5 & H2, one with both H5 & H4, two were H9 and one was H7N5, though H7 was genetically distinct from that of the novel H7N9 virus of China. Among quail samples, one was H5 (HPAI) and one was H9. In case of pigeon samples, all three contained H9. From this study it was revealed that HPAI (H5N1) is still circulating in our poultry population. The novel avian influenza virus H7N9 was not found during this study.
The study was conducted in the 20 upazila of 10 selected major potato growing districts of Bangla... more The study was conducted in the 20 upazila of 10 selected major potato growing districts of Bangladesh during the period from December 2014 to February 2015 to find out the present status and diversity of insect pests of potato, their risks and management options. The data were collected through interview of 60 field level officers of DAE including one UAO, one AEO and one SAAO. The data were analyzed using computer program SPSS 20 version. BARI Alu-7 (Diamant) variety and BARI Alu-8 (Cardinal) variety of potato were the most popular potato varieties used by the farmers for cultivation. The major sources of potato seeds used by the farmers for cultivation were the own produced seeds, BADC seeds, seed traders/dealers and neighboring farmers. Major problems faced during potato cultivation were diseases, insect pest attack and weed attack. The BARI Alu-7 (Diamant) and BARI Alu-8 were most susceptible potato varieties to insect pests and diseases, whereas the Lal-pakhri was the least susceptible to pests. Mostly (98.50%) the potato was infested in the field by cutworm, aphid, potato tuber worm, leaf miner, mole cricket, field cricket and leaf hoppers. Among these insect pests, cutworm and aphid were identified as major pests and caused damage with high and moderate infestation intensity, respectively. Others were identified as minor insect pests of potato caused damage with low infestation intensity. Mostly (73.50%) the potato tuber worm attacked potato tubers in storage and designated as a major insect pest of potato in storage and damaged potato with high infestation intensity. Currently cutworm and aphid were more damaging insect pest of potato in field condition than previous infestation, and potato tuber worm was more damaging insect pest in storage. Other important control options were application of flood irrigation and hand picking particularly for controlling cutworm, use of granular insecticides in furrows during planting of seed tubers. Most (95%) of the farmers received assistance and advices for controlling insect pests of potato from pesticide dealers. Other sources of services were DAE officials, neighboring farmers and NGO officials.
The Indonesian archipelago is an ideal setting for the study of speciation and biogeography. This... more The Indonesian archipelago is an ideal setting for the study of speciation and biogeography. This archipelago is divided into three island groups based on zoogeography: Sundaland, Wallaceaand the Australian region. In this paper we used frogs in genus Fejervarya (Bolkay) to study biogeography and examine patterns of gene flow across proposed zoogeographic boundaries. Severalmolecular studies on Fejervarya species from Indonesia have been carried out, but comparative studies among members of the genus Fejervarya have yet to be performed. In order to elucidate genetic divergence and geographic distribution of these frogs, we conducted a molecular analysis of the mitochondrial 16S rRNA gene using 179 frogs from five Fejervarya species. In total we collected from 32 localities in Sumatra, Kalimantan (Indonesian part of Borneo), Java, Bali, Sulawesi and Lesser Sunda Islands in Indonesia. Molecular phylogenetic analysis recovered 35 haplotypes and showed that frogs in the genus Fejervarya...
In this paper we address the problem of image fusion between imagery acquired by trichromatic sen... more In this paper we address the problem of image fusion between imagery acquired by trichromatic sensors and hyperspectral imagers. We do this by presenting a method aimed at registering a high-resolution trichromatic image with lower resolution hyperspectral data. The method presented here maps the hyperspectral image into the grayscale image so as to employ the cross cumulative residual entropy for purposes of multimodal registration. We illustrate the utility of our approach by presenting registration results on a set of surveillance image pairs consisting of a set of high-oblique colour and hyperspectral images.
2014 IEEE International Symposium on Signal Processing and Information Technology (ISSPIT), 2014
Numerous environmental sources of noise and distortion can degrade the quality of the speech sign... more Numerous environmental sources of noise and distortion can degrade the quality of the speech signal in a communication system. This study explores the effects of these intrusive sounds on speech applications and introduces some techniques for reducing the influence of noise and, enhancing the acceptability and intelligibility of the speech signal. In this paper, a noise reduction system uses single -microphone method in time domain to improve signal to noise ratio (SNR) of noise contaminated speech. In the early phase of noise reduction, the amount of noise is estimated from the valley of the spectrum based on the harmonic properties of noisy speech, called minimum value sequences (MVS). Therefore, we use the estimated degree of noise (EDON) [1] to adjust the amplitudes of the MVS. The base of the proposed method is to estimate noise continuously on a frame-by-frame basis without the aid of voice activity detector (VAD)[2]. This research uses single-channel adaptive filter (SAF) to reduce time and cost for maximum noise reduction. For this, we propose a minimum computational iteration number (CIN) and generated an equation from set values of SNR and EDON. By adopting the proposed iteration number, the planned system becomes computationally inexpensive and the signal resurgence difficulty is limited in the silent portion. To derive the proposed iteration number equation, we use the third degree parabola equation and least squares solution for the coefficients of EDON.
The River Buriganga, is a tide-influenced river, passing through the south-western edge of Dhaka ... more The River Buriganga, is a tide-influenced river, passing through the south-western edge of Dhaka city. The river has served as a nucleus to the commercial activities of Dhaka for over centuries. But due to acute human interference and industrial intrusion, both the flow and function of the river has been interrupted. For over last few decades, Buriganga River has been polluted indiscriminately by industrial discharge, domestic garbage, partially treated or untreated sewage, vessel fuel discharge etc. The situation is exacerbated by lack of proper waste management, operational effluent treatment plants. This study focuses on determining the resultant of the continuous pollution in terms of three selected water quality parameters. The parameters include pH, Biochemical Oxygen Demand (BOD5) and Ammonia-Nitrogen (NH3-N). In order to conduct the study, water samples were collected from five different sampling stations along the river Buriganga. All the samples were collected during the m...
American Journal of Biochemistry and Biotechnology, 2015
Snake venom is a mixture of many biological components. Snakes usually use their venomic armory t... more Snake venom is a mixture of many biological components. Snakes usually use their venomic armory to tackle different prey and predators in adverse natural world. Among various components of the snake venom, neurotoxins play an important role in exerting effect by blocking the neuromuscular transmission through selective binding to muscle nicotinic Acetyl-Choline Receptors (nAChR). A set of 30 reference protein sequences representing neurotoxin of snake venom were retrieved from NCBI protein database and characterized for various physic-chemical properties, Multiple Sequence Alignment (MSA), phylogenetic analysis and motifs election. The physic-chemical properties of the selected proteins were analyzed by using ExPASy's Prot Param tool and it was found that the Molecular Weight (M.Wt) of maximum proteins is around 10000 Da. Isoelectric points (pI) of all the organisms were found to be basic in nature. The aliphatic index infers that neurotoxins showed the tendency of having both wide and low range of temperature as 16 proteins showed AI above 70 and others showed AI value below 70. The negative value of GRAVY indicates that there will be better interaction with water. The secondary structure prediction was done by SOPMA which showed that random coils dominated all the other conformations. Multiple sequence analysis and Phylogenetic analysis of neurotoxins were carried out by MEGA 5. Motif election was done by MEME which represents motif 1 (21 sequences), Motif 2 (11 sequences), Motif 3 (3 sequences) and these indicates the region also indicates the DUF3963, Toxin_1 (PF008), CAP (PF0188) protein family respectively which was done by Pfam. Motif 2 gives the insight of functional domain for neurotoxins and also suggests the degenerate primer for neurotoxin protein family.
International Journal of Pharmacy and Biological Sciences
Objective: To investigate the therapeutic effects of ethanol extract and its fractions of Rhaphid... more Objective: To investigate the therapeutic effects of ethanol extract and its fractions of Rhaphidophora glauca leaves in anthelmintic (in vitro) and α-amylase inhibitory activity (in vitro). Methods: Leaves of Rhaphidophora glauca was extracted with pure ethanol and fractioned with chloroform (CHFRG), petroleum ether (PEFRG), n-hexane (NHFRG) and ethyl acetate (EAFRG), which are tested for anthelmintic activity on aquarium worm Tubifex tubifex by using three concentrations viz., 5, 10 and 20 mg/ml of each. α-amylase inhibitory activity estimated by modified starch iodine protocol. Result: Among the EERG and various fractions, PEFRG exhibited strong anthelmintic activity in vitro. Where it paralyzed (4.54±0.39 min) and produced death (8.37±0.86 min) of the Tubifex tubifex at 20 mg/ml dose near the value of the standard, Levamisole (3.3±0.38 min and 6.5±0.76 min) at 1 mg/ml. EERG and its all fractions showed good α-amylase inhibitory activity, but PEFRG [IC50=1.757±0.025mg/ml] showed ...
Exact solution of Einstein's field equations with variable cosmological constant is obtained ... more Exact solution of Einstein's field equations with variable cosmological constant is obtained in presence of bulk viscous barotropic fluid for Bianchi type-I space time. To get a determinate solution of the field equations the average scale factor 3 R , in the model is considered as a linear function of t and also the fluid obeys the barotropic equation of state. The physical aspects of the model with astronomical observations are discussed.
Background: The phytochemical screening of methanolic extract of Dalbergia stipulacea and Hymendi... more Background: The phytochemical screening of methanolic extract of Dalbergia stipulacea and Hymendictyon excelsum has indicated the presence of steroid, flavonoid and glycoside like antioxidative and cardioprotective compounds. Methods: Since these compounds are of pharmacological interest, we got curious to check D. stipulacea and H. excelsum for their possible anti-inflammatory activity by HRBC (Human Red Blood Cell) membrane stabilization method, anti-arthritic activity by the inhibition of protein Original Research Article
Quality assessment as well as hydrogeochemical characterization of 45 representative groundwater ... more Quality assessment as well as hydrogeochemical characterization of 45 representative groundwater samples around Umrer coal mine area was undertaken. The pH of the water lies in the normal range i.e. from 7.5 to 8.5, the electrical conductivity varies from 826 to 1,741, the total hardness varies from 289 to 1,302 and the TDS values range from 528.6 to 1,114.2 mg/l which reflects variation in lithology and thus, the distinction in hydrogeological regime. The cation chemistry is dominated by Ca 2? and Mg 2? while anion chemistry is dominated by Cland HCO 3-. Out of total ten hydrochemical facies, the two dominant facies are Mg-Ca-HCO 3 (37.7 %) and Ca-Mg-SO 4-HCO 3 (17.7 %). The groundwater in the study area, in general, is useful for drinking and domestic use; however, it has marginal utility for irrigation purpose. Standard US Salinity Laboratory classification shows that water of the study area belongs to C2-S1 and C3-S1 classes. The concentration of 9 trace elements analysed from 18 samples did not exceed the desirable limit.
2010 IEEE International Conference on Image Processing, 2010
In this paper we address the problem of image fusion between imagery acquired by trichromatic sen... more In this paper we address the problem of image fusion between imagery acquired by trichromatic sensors and hyperspectral imagers. We do this by presenting a method aimed at registering a high-resolution trichromatic image with lower resolution hyperspectral data. The method presented here maps the hyperspectral image into the grayscale image so as to employ the cross cumulative residual entropy for purposes of multimodal registration. We illustrate the utility of our approach by presenting registration results on a set of surveillance image pairs consisting of a set of high-oblique colour and hyperspectral images.
2014 IEEE Conference on Computer Vision and Pattern Recognition, 2014
Most of the state-of-the-art approaches to human activity recognition in video need an intensive ... more Most of the state-of-the-art approaches to human activity recognition in video need an intensive training stage and assume that all of the training examples are labeled and available beforehand. But these assumptions are unrealistic for many applications where we have to deal with streaming videos. In these videos, as new activities are seen, they can be leveraged upon to improve the current activity recognition models. In this work, we develop an incremental activity learning framework that is able to continuously update the activity models and learn new ones as more videos are seen. Our proposed approach leverages upon state-ofthe-art machine learning tools, most notably active learning systems. It does not require tedious manual labeling of every incoming example of each activity class. We perform rigorous experiments on challenging human activity datasets, which demonstrate that the incremental activity modeling framework can achieve performance very close to the cases when all examples are available a priori.
2010 International Symposium on Voronoi Diagrams in Science and Engineering, 2010
AbstractTremendous research activities took place on the proximity analysis of points and straig... more AbstractTremendous research activities took place on the proximity analysis of points and straight lines in three-dimensions using Voronoi diagrams. However, less attention has been paid to the proximity of curves in three-dimensions due to the complexity involved in ...
2009 Digital Image Computing: Techniques and Applications, 2009
AbstractFrequently the need arises to combine remotely sensed data taken from different sensors ... more AbstractFrequently the need arises to combine remotely sensed data taken from different sensors for improved interpretation of an imaged area. However, before this multi-sensor data fusion can be performed the image data must first be registered geometrically. In this paper we ...
The aim of the present study was to examine the antibacterial activity of methanol extract of pom... more The aim of the present study was to examine the antibacterial activity of methanol extract of pomegranate peels against some Gram positive and negative bacteria. The antibacterial activity was evaluated using both agar-diffusion method and minimum inhibitory concentration (MIC). With the exception of Streptococcus faecalis and Salmonella, all of the bacteria showed sensitivity to methanol extracts of pomegranate peel The Minimum Inhibitory Concentration varied with Streptococcus salivarius and Bacillus subtilis having the lowest MIC (1mg/ml) while Streptococcus faecalis and Salmonella where more resistant, having MICs of 4 and 8 mg/ml respectively.
Mastitis is a serious problem for the dairy cattle in many countries of the world including Bangl... more Mastitis is a serious problem for the dairy cattle in many countries of the world including Bangladesh. Among the microbial etiology bacteria plays a major role in the onset of the clinical form of the disease. Many of these bacteria are resistant to one or more antibiotics thus make the mastitis cases difficult to cure. In the present study Staphylococcus spp., Streptococcus spp., Bacillus spp. and E. coli were identified as the dominant bacterial species causing clinical mastitis in cattle in Mymensingh. Antibiogram study revealed chloramphenicol and erythromycin as the most effective antibiotic for the treatment of mastitis in these animals except those caused by Bacillus spp. and E. coli, respectively. Microbes and Health, June 2013, 2(1): 19-21DOI: http://dx.doi.org/10.3329/mh.v2i1.17258
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Papers by Mahmudul Hasan