M Golam Mortuza - Academia.edu (original) (raw)

Papers by M Golam Mortuza

Chemosphere, Mar 1, 2017

Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria canno... more Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se 0) under both aerobic and anaerobic conditions. The biogenic nano-Se 0 converted 45.8-57.1% and 39.1-48.6% of elemental mercury (Hg 0) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg 0 remediation, probably owing to the release of intracellular nano-Se 0 from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se 0 and Hg 0. Biosynthesis of nano-Se 0 both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg 0-contaminated surface and subsurface soils, where the redox potential often changes dramatically.

Geomicrobiology Journal, 2015

ABSTRACT Acidithiobacillus ferrooxidans is a commonly used bacterial species for leaching gold or... more ABSTRACT Acidithiobacillus ferrooxidans is a commonly used bacterial species for leaching gold ores to recover gold. The pH of A. ferrooxidans bioleachates drastically changes from around 2.0 during bioleaching to about pH 8.0 as the cells are discharged together with the mine tailings containing high levels of Hg. It is not known how such a large pH shock would affect the properties of bacterial extracellular polymeric substances (EPS) and the transport of Hg in the mine tailings. In this study, the biochemical composition, molecular distribution, fluorescence properties and Hg(II) complexation by EPS of A. ferrooxidans cultured at pH 2 and 8 were investigated. It was found that pH shock significantly altered the composition of EPS. A. ferrooxidans yielded more EPS under acid conditions than basic conditions. The acidic EPS contained more macromolecular proteins but less polysaccharide in comparison with the basic EPS. Phosphodiester functional groups in phospholipids and polysaccharides were found in the acidic EPS but not in the basic EPS. One tryptophan protein-like peak and one aromatic protein-like peak were identified in fluorescence spectra of the acidic EPS. Two aromatic protein-like peaks were identified from the fluorescence spectra of the basic EPS. The tryptophan protein-like substances in the acidic EPS interacted with Hg(II) and formed relatively stable complexes but with weak binding ability whereas the fluorescent aromatic protein-like substances in the acidic EPS did not bind Hg(II). However the aromatic protein-like substances in the basic EPS had a strong binding ability for Hg(II). The significant differences in composition and Hg complexation ability between EPS from acidic and basic environments indicate that a large pH shock during leaching of gold may exert a considerable impact on the behavior and fate of Hg in the mining areas.

Chemosphere, Jan 8, 2015

Simultaneous removal of antibiotic tetracycline hydrochloride (TC) and As(III) by poorly-crystall... more Simultaneous removal of antibiotic tetracycline hydrochloride (TC) and As(III) by poorly-crystalline Mn dioxide was investigated. TC and As(III) can be effectively oxidized and removed by MnO2. High concentrations of TC and As(III) competed with each other for oxidation or adsorption sites on MnO2 and thus affected their removal efficiency. The intermediates and products of TC after reaction with poorly-crystalline manganese dioxide were identified by LC-ESI-MS (liquid chromatography-electrospray ionization-mass spectrometry), and the decomposition pathways of TC by MnO2 were proposed. This study is helpful for understanding the importance of environmental Mn dioxides in the decontamination of combined pollution by organic pollutants and metal(loid)s.

Journal of Health Science, 2005

The effects of hexavalent chromium on the cell growth of green paramecium, Paramecium bursaria (P... more The effects of hexavalent chromium on the cell growth of green paramecium, Paramecium bursaria (P. bursaria), were investigated in this study. Two strains (MB-1 and F 1 generation) of P. bursaria were incubated in lettuce media supplemented with different concentrations of potassium dichromate under light (L) L (24 hr light), L dark (LD) (12 hr light : 12 hr dark) and DD (24 hr dark) conditions, and the IC 50 values were obtained. The IC 50 7-day value showed that the toxicity of potassium dichromate was light-sensitive in both strains of P. bursaria. The results of the toxic effect of chromium on the cell shape of P. bursaria (BWK-4) showed that the body ratio of P. bursaria increased, even if the cells were incubated for 24 hr with 0.5 µM potassium dichromate solution, indicating that the cell shape of P. bursaria is very sensitive to potassium dichromate. The average amount of chromium accumulated in green paramecium ranged from 1.72 to 15.5 pg Cr/cell in a time-and concentration-dependent manner. This finding indicates the possibility of the use of P. bursaria as a biomonitor and bioaccumulator for chromium contaminants in aquatic environments. The experiment with electrical stimuli into the culture of P. bursaria indicated that cells accumulated at the negative electrode, suggesting that P. bursaria carried a positive charge. Thus, because the positive charge does not cause any significant absorption of chromium into the cells, P. bursaria may develop a variety of mechanisms for chromium accumulation in the cell. Further research studies are required to elucidate the mechanism of chromium uptake in P. bursaria.

Journal of Food Processing and Preservation, 2010

Kalimatar seeds were evaluated for their physical characteristics and cooking qualities. Physical... more Kalimatar seeds were evaluated for their physical characteristics and cooking qualities. Physical characteristics of Kalimatar seeds measured in millimeters per seed were as follows: length 6.65 Ϯ 0.11; breadth 4.76 Ϯ 0.09; and thickness 4.49 Ϯ 0.07. Cooking qualities of the seeds were evaluated as follows: 1,000-seed weight 199.95 Ϯ 0.34 g; 1,000-seed volume 152.0 Ϯ 0.58 mL; seed density 1.27 Ϯ 0.02 g/ mL; hydration capacity 1386.1 Ϯ 2.63 g/kg; and swelling capacity 1493.4 Ϯ 3.82 mL/L. The cooking time of untreated Kalimatar seed was 187 Ϯ 3.15 min; soaking the seeds in different media for 12 h reduced the cooking time considerably. Sodium carbonate solution (2%) was found as the most suitable soaking medium, particularly followed by roasting the seeds. Soaking and/or roasting did not cause pronounced reduction in nutrient content of the sample. PRACTICAL APPLICATIONS Long cooking time severely restricts the utilization of Kalimatar, a protein-rich source. This study aims to evaluate the effect of soaking and/or roasting on the cooking time of Kalimatar seed to find out a feasible way out of the problem. We found that soaking and quick cooking system considerably reduces the cooking time of Kalimatar without pronounced nutrient loss. Both methods can be adopted very successfully on a household scale as well as at industrial level. However, quick cooking method is much better than soaking system. Again, quick cooking seeds are suitable for preservation. Moreover, this method improves the nutritional quality and palatability of the seeds.

University Journal of Zoology, Rajshahi University, 2009

No Key words: Labeo boga, length-weight relationship, condition factor doi:10.3329/ujzru.v27i0.19... more No Key words: Labeo boga, length-weight relationship, condition factor doi:10.3329/ujzru.v27i0.1964 Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 97-98

Journal of Fish Biology, 1976

The length-weight relationship and condition factor of 420 dolphin-fish (Coryphaena hippurus) col... more The length-weight relationship and condition factor of 420 dolphin-fish (Coryphaena hippurus) collected in Malta in 1974 were determined. The length-weight relationship for the size range investigated was similar to that reported for the fish from North America. The main food items were flying fish and other fish and crabs.

Despite their trophodynamic importance in many aquatic ecosystems, few studies have quantified th... more Despite their trophodynamic importance in many aquatic ecosystems, few studies have quantified the feeding-growth relationship of clupeid fishes. In laboratory trials, we quantified the relationship between rates of food consumption (C, % fish energy content (Joules d−1)), somatic growth rate (G, % Joules d−1), and swimming speed (SS, body lengths (bl) s−1) for post-larval (30- to 50-mm standard length) European sprat (Sprattus sprattus L.) collected from the southwestern Baltic Sea. Measurements of G and SS were also made on groups before and after an abrupt shift in prey availability. Maintenance (0-growth) and maximum food consumption rates were 5.5 and 42 % somatic energy content d−1, respectively. Mean ± SE gross growth efficiency (K1 = 100∙G∙C−1) was 26.9 ± 3.0 %. Unfed post-larvae had markedly lower SS compared to continuously-fed fish (0.1 versus 0.5 to 0.7 bl s−1). After 10 days of re-feeding, one group of previously unfed fish was hyperactive (mean SS of 1.2 bl s−1) but no re-fed groups exhibited hyperphagia (based upon prey numbers), increased K1, or compensatory growth. Increased competition (relatively high SS) was evident during feeding in fish maintained at low to moderate but not at ad libitum prey levels. Our findings provide estimates of prey resources required to fuel in situ growth and help characterize metabolic strategies of European sprat within variable feeding environments.

Fisheries and aquatic resources are economically, ecologically, culturally and aesthetically impo... more Fisheries and aquatic resources are economically, ecologically, culturally and aesthetically important to the nation. From the global perspectives, the main issues facing by the international fishing community generally are over fishing, overcapacity, by-catch management as well as environmental degradation. The combined effect of these factors that have made 60-70 % of the major world fisheries resources are in urgent need of management action to restrict the increase in fishing capacity and to rehabilitate damaged resources (FAO, 1991). In Bangladesh, fisheries is one of the major sub-sectors of agriculture, which play a dominant role in nutrition, employment, earning foreign currency and other areas of economy. This sub-sector contributes about 80% to the national animal protein intakes, nearly 6 % to the

Abstract.-This study describes a new approach for assessing toxic response behaviour of Caenorhab... more Abstract.-This study describes a new approach for assessing toxic response behaviour of Caenorhabditis elegans by automatic recognition of line movement through an image-processing system. The movement behaviour of this nematode is different even at low concentrations of formaldehyde. A comparison of the response behaviour of this animal at different concentrations of formaldehyde has shown concentration-dependent toxicity. This study has identified some sequential line-movements on nematodes that confirmed the toxicological effect on nematode behaviour.

Abstract.-The contamination of heavy metals, such as chromium (Cr), iron (Fe), cobalt (Co), nicke... more Abstract.-The contamination of heavy metals, such as chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), cadmium (Cd) and lead (Pb) were evaluated in the water and tissues of African catfish Clarias gariepinus and Sabaki tilapia Oreochromis spilurus from Wadi Hanifah, Riyadh. The samples were collected from three sampling sites (Namar, Al-Masani and Al-Hair) of Wadi Valley of central Saudi Arabia during May-June 2013. The water and fish samples collected from Al-Masani, nearby a vehicle mechanical industrial area, were found to be more contaminated by Cr, Fe, Zn and Pb than those of other sampling sites. The high concentrations of Fe were detected in all the water and fish samples, followed by Zn, Pb, Cr, Co, Ni and Cd. However, none of the detected HM (heavy metals) concentrations were exceeded the permissible limits set by the different authorities. The estimated daily intake was found to be below the provisional tolerable daily intake (PTDI), established by the FAO and...

2 Abstract: The studies on length-weight relationships (LWR), condition factors (K) and sex-ratio... more 2 Abstract: The studies on length-weight relationships (LWR), condition factors (K) and sex-ratio of Nile tilapia, Oreochromis niloticus in Wadi Hanifah, Riyadh, Saudi Arabia was conducted from September 2011 to August 2012. A total of 575 specimens were collected from different sample stations using different types of net and by angling. The fishes were ranged from 76-273 mm, 69-261 mm and 69-273 mm in length for male, female and combined sex respectively, while weight ranged 14.8-430 g for male, 13.1-402 g for female and 13.1-430 g for combined sex. The values of regression coefficient for length-weight relationship are 3.16, 2.98 and 3.01 for male, female and combined sex respectively. This indicated that positive allometric growth for all sexes. The mean values of condition factor were calculated as 1.16, 1.02 and 1.09 for male, female and combined sex respectively that indicated healthy condition of fish. There is no significant different in male and female distribution of O. n...

Bangladesh Journal of Botany, 2010

Seed-cotyledons of Vicia faba L. an unconventional legume from Bangladesh were analyzed for chemi... more Seed-cotyledons of Vicia faba L. an unconventional legume from Bangladesh were analyzed for chemical composition and protein functionality to assess its potential usage as an alternative source of protein. Proximate component in per cent were crude protein 30.57, crude fat 3.22, crude fibre 2.73, ash 3.61 and carbohydrate 59.87. With the exception of methionine plus cystine, the essential amino acids in the seedcotyledons were present at concentrations equal to or greater than those commonly recommended. Least gelation concentration, water and fat absorption capacities were 8.00, 83.86 and 79.43%, respectively. Foaming capacity and foaming stability were 57.19 and 29.78%, respectively. With respect to its nutritive composition and functionality, the pulse appeared to be a potential source of nutrient. Key words: Vicia faba ; Chemical composition; Functional properties; Legumes; Bangladesh DOI: 10.3329/bjb.v38i1.5129 Bangladesh J. Bot. 38 (1): 93-97, 2009 (June)

The study was conducted to assess heavy metals concentrations in water, sediment and white shrimp... more The study was conducted to assess heavy metals concentrations in water, sediment and white shrimp (Liptopenaeus vannamei) of Red Sea, Jizan, Saudi Arabia, using ICP-MS. The concentrations of heavy metals in water were above the recommended drinking water standards setup by the WHO/USEPA (World Health Organization/United States Environmental Protection Agency). However the concentrations of heavy metals in sediment and white leg shrimp were lower than the recommended levels proposed by WHO/USEPA, except Cr level in shrimp muscle. The level of contamination degree (Cd) and modified contamination degree (mCd) indicated ‘low’ and ‘very low’ degree of contamination respectively. Pollution load index (PLI) of the studied area was lower than unity, indicated no pollution. Furthermore, a toxic response factor was applied to determine the potential ecological risk index (RI) of these heavy metals into the water body. The results of this study exhibited a low potential ecological risk of heav...

The infrared spectra of xPbO (1-x-z)SiO 2 zP 2 O 5 glasses with a PbO:SiO 2 molar ratio of 3:2 an... more The infrared spectra of xPbO (1-x-z)SiO 2 zP 2 O 5 glasses with a PbO:SiO 2 molar ratio of 3:2 and z=0,1,2,5,30,40 and 50 mol% have been examined in the region 4000-400 cm - 1 , together with XRD. The structure of PbO-SiO 2 binary glass is significantly different from that of P 2 O 5 substituted glasses. The low amount of P 2 O 5 containing PbO-SiO 2 glasses results in infrared spectra of the same pattern as 3:2 binary lead silica glass but the maximum peak intensities and positions are different. The spectra of high P 2 O 5 (30-50 mol%) containing glasses show an increased number of distinct peaks in the low frequency region with a convolution of several broad Gaussians in the high frequency region. All the spectra are base line corrected and deconvoluted to appropriate number of Gaussians. The peaks and peak positions of the Gaussians are assigned to Si-O-Si, Si-O-Pb, Si-O-P, P-O-P, O-P-O, P=O, P-O - etc. bonds. A variation in the band positions and the relative amounts of bonds w...

Semi-empirical formulae BEBA, BEB and Pattard-Rost models are employed to compute the total cross... more Semi-empirical formulae BEBA, BEB and Pattard-Rost models are employed to compute the total cross-section of single ionization of Si + , Si + + and Cr 7 + ions by electron impact. The parameters of the semi-empirical formulae are obtained by fitting with the experimental data over a wide range of energy. It is found that, the semi-empirical formulae provide excellent fit, while the BEBA and BEB models give qualitative fit to the experimental data. The parameter-free Pattard-Rost model is in fairly good agreement with the data.

Chemosphere, 2017

Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria canno... more Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se(0)) under both aerobic and anaerobic conditions. The biogenic nano-Se(0) converted 45.8-57.1% and 39.1-48.6% of elemental mercury (Hg(0)) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg(0) remediation, probably owing to the release of intracellular nano-Se(0) from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se(0) and Hg(0). Biosynthesis of nano-Se(0) both aerobically and anaerobically therefore provides ...

Fisheries and Aquaculture Journal, 2015

Fasciola hepatica was reported for the first time from the faecal sample of a 60 years old man du... more Fasciola hepatica was reported for the first time from the faecal sample of a 60 years old man during the survey of human intestinal parasitic infections in Swat, Pakistan. The man belonged to shepherd community of Swat.

Journal of the Science of Food and Agriculture, Apr 5, 2009

BACKGROUND: Increasing global protein consumption has led to the demand for new sources of food p... more BACKGROUND: Increasing global protein consumption has led to the demand for new sources of food protein, particularly plant sources. Many inexpensive but protein-rich bean cultivars have not been well evaluated and are thus underutilised. In this study the physicochemical and functional properties of seeds of ten seem cultivars were assessed. RESULTS: In agreement with their sizes, seeds of Airet had the highest 1000-seed weight and volume, while those of Bari had the lowest. In terms of proximate composition (g kg −1), protein content ranged from 240.08 (Ashina) to 292.63 (Puti), fat content from 31.47 (Goalgadda) to 38.40 (Puti), ash content from 32.80 (Puli) to 45.53 (Goalgadda) and fibre content from 21.90 (Tatulia) to 28.90 (Noldog). Hydration (g kg −1) and swelling (mL L −1) capacities ranged from 1688.60 and 1850.43 (Goalgadda) to 1999.40 and 2208.66 (Rupbhan) respectively. Similarly, cooking time (min) varied from 114 (Rupbhan) to 179 (Goalgadda). Lowest gelation concentration was in the range 80-100 g kg −1. Water and fat absorption capacities (g kg −1) ranged from 941.00 and 644.44 (Ashina) to 1043.33 and 749.26 (Puti) respectively. Foaming capacity and stability (mL L −1) ranged from 443 (Puli) to 635 (Puti) and from 314 (Ashina) to 643 (Rupbhan) respectively. CONCLUSION: Seeds of seem cultivars appear to be a promising food in terms of their protein content and functionality.

Chemosphere, Mar 1, 2017

Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria canno... more Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se 0) under both aerobic and anaerobic conditions. The biogenic nano-Se 0 converted 45.8-57.1% and 39.1-48.6% of elemental mercury (Hg 0) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg 0 remediation, probably owing to the release of intracellular nano-Se 0 from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se 0 and Hg 0. Biosynthesis of nano-Se 0 both aerobically and anaerobically therefore provides a versatile and cost-effective remediation approach for Hg 0-contaminated surface and subsurface soils, where the redox potential often changes dramatically.

Geomicrobiology Journal, 2015

ABSTRACT Acidithiobacillus ferrooxidans is a commonly used bacterial species for leaching gold or... more ABSTRACT Acidithiobacillus ferrooxidans is a commonly used bacterial species for leaching gold ores to recover gold. The pH of A. ferrooxidans bioleachates drastically changes from around 2.0 during bioleaching to about pH 8.0 as the cells are discharged together with the mine tailings containing high levels of Hg. It is not known how such a large pH shock would affect the properties of bacterial extracellular polymeric substances (EPS) and the transport of Hg in the mine tailings. In this study, the biochemical composition, molecular distribution, fluorescence properties and Hg(II) complexation by EPS of A. ferrooxidans cultured at pH 2 and 8 were investigated. It was found that pH shock significantly altered the composition of EPS. A. ferrooxidans yielded more EPS under acid conditions than basic conditions. The acidic EPS contained more macromolecular proteins but less polysaccharide in comparison with the basic EPS. Phosphodiester functional groups in phospholipids and polysaccharides were found in the acidic EPS but not in the basic EPS. One tryptophan protein-like peak and one aromatic protein-like peak were identified in fluorescence spectra of the acidic EPS. Two aromatic protein-like peaks were identified from the fluorescence spectra of the basic EPS. The tryptophan protein-like substances in the acidic EPS interacted with Hg(II) and formed relatively stable complexes but with weak binding ability whereas the fluorescent aromatic protein-like substances in the acidic EPS did not bind Hg(II). However the aromatic protein-like substances in the basic EPS had a strong binding ability for Hg(II). The significant differences in composition and Hg complexation ability between EPS from acidic and basic environments indicate that a large pH shock during leaching of gold may exert a considerable impact on the behavior and fate of Hg in the mining areas.

Chemosphere, Jan 8, 2015

Simultaneous removal of antibiotic tetracycline hydrochloride (TC) and As(III) by poorly-crystall... more Simultaneous removal of antibiotic tetracycline hydrochloride (TC) and As(III) by poorly-crystalline Mn dioxide was investigated. TC and As(III) can be effectively oxidized and removed by MnO2. High concentrations of TC and As(III) competed with each other for oxidation or adsorption sites on MnO2 and thus affected their removal efficiency. The intermediates and products of TC after reaction with poorly-crystalline manganese dioxide were identified by LC-ESI-MS (liquid chromatography-electrospray ionization-mass spectrometry), and the decomposition pathways of TC by MnO2 were proposed. This study is helpful for understanding the importance of environmental Mn dioxides in the decontamination of combined pollution by organic pollutants and metal(loid)s.

Journal of Health Science, 2005

The effects of hexavalent chromium on the cell growth of green paramecium, Paramecium bursaria (P... more The effects of hexavalent chromium on the cell growth of green paramecium, Paramecium bursaria (P. bursaria), were investigated in this study. Two strains (MB-1 and F 1 generation) of P. bursaria were incubated in lettuce media supplemented with different concentrations of potassium dichromate under light (L) L (24 hr light), L dark (LD) (12 hr light : 12 hr dark) and DD (24 hr dark) conditions, and the IC 50 values were obtained. The IC 50 7-day value showed that the toxicity of potassium dichromate was light-sensitive in both strains of P. bursaria. The results of the toxic effect of chromium on the cell shape of P. bursaria (BWK-4) showed that the body ratio of P. bursaria increased, even if the cells were incubated for 24 hr with 0.5 µM potassium dichromate solution, indicating that the cell shape of P. bursaria is very sensitive to potassium dichromate. The average amount of chromium accumulated in green paramecium ranged from 1.72 to 15.5 pg Cr/cell in a time-and concentration-dependent manner. This finding indicates the possibility of the use of P. bursaria as a biomonitor and bioaccumulator for chromium contaminants in aquatic environments. The experiment with electrical stimuli into the culture of P. bursaria indicated that cells accumulated at the negative electrode, suggesting that P. bursaria carried a positive charge. Thus, because the positive charge does not cause any significant absorption of chromium into the cells, P. bursaria may develop a variety of mechanisms for chromium accumulation in the cell. Further research studies are required to elucidate the mechanism of chromium uptake in P. bursaria.

Journal of Food Processing and Preservation, 2010

Kalimatar seeds were evaluated for their physical characteristics and cooking qualities. Physical... more Kalimatar seeds were evaluated for their physical characteristics and cooking qualities. Physical characteristics of Kalimatar seeds measured in millimeters per seed were as follows: length 6.65 Ϯ 0.11; breadth 4.76 Ϯ 0.09; and thickness 4.49 Ϯ 0.07. Cooking qualities of the seeds were evaluated as follows: 1,000-seed weight 199.95 Ϯ 0.34 g; 1,000-seed volume 152.0 Ϯ 0.58 mL; seed density 1.27 Ϯ 0.02 g/ mL; hydration capacity 1386.1 Ϯ 2.63 g/kg; and swelling capacity 1493.4 Ϯ 3.82 mL/L. The cooking time of untreated Kalimatar seed was 187 Ϯ 3.15 min; soaking the seeds in different media for 12 h reduced the cooking time considerably. Sodium carbonate solution (2%) was found as the most suitable soaking medium, particularly followed by roasting the seeds. Soaking and/or roasting did not cause pronounced reduction in nutrient content of the sample. PRACTICAL APPLICATIONS Long cooking time severely restricts the utilization of Kalimatar, a protein-rich source. This study aims to evaluate the effect of soaking and/or roasting on the cooking time of Kalimatar seed to find out a feasible way out of the problem. We found that soaking and quick cooking system considerably reduces the cooking time of Kalimatar without pronounced nutrient loss. Both methods can be adopted very successfully on a household scale as well as at industrial level. However, quick cooking method is much better than soaking system. Again, quick cooking seeds are suitable for preservation. Moreover, this method improves the nutritional quality and palatability of the seeds.

University Journal of Zoology, Rajshahi University, 2009

No Key words: Labeo boga, length-weight relationship, condition factor doi:10.3329/ujzru.v27i0.19... more No Key words: Labeo boga, length-weight relationship, condition factor doi:10.3329/ujzru.v27i0.1964 Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 97-98

Journal of Fish Biology, 1976

The length-weight relationship and condition factor of 420 dolphin-fish (Coryphaena hippurus) col... more The length-weight relationship and condition factor of 420 dolphin-fish (Coryphaena hippurus) collected in Malta in 1974 were determined. The length-weight relationship for the size range investigated was similar to that reported for the fish from North America. The main food items were flying fish and other fish and crabs.

Despite their trophodynamic importance in many aquatic ecosystems, few studies have quantified th... more Despite their trophodynamic importance in many aquatic ecosystems, few studies have quantified the feeding-growth relationship of clupeid fishes. In laboratory trials, we quantified the relationship between rates of food consumption (C, % fish energy content (Joules d−1)), somatic growth rate (G, % Joules d−1), and swimming speed (SS, body lengths (bl) s−1) for post-larval (30- to 50-mm standard length) European sprat (Sprattus sprattus L.) collected from the southwestern Baltic Sea. Measurements of G and SS were also made on groups before and after an abrupt shift in prey availability. Maintenance (0-growth) and maximum food consumption rates were 5.5 and 42 % somatic energy content d−1, respectively. Mean ± SE gross growth efficiency (K1 = 100∙G∙C−1) was 26.9 ± 3.0 %. Unfed post-larvae had markedly lower SS compared to continuously-fed fish (0.1 versus 0.5 to 0.7 bl s−1). After 10 days of re-feeding, one group of previously unfed fish was hyperactive (mean SS of 1.2 bl s−1) but no re-fed groups exhibited hyperphagia (based upon prey numbers), increased K1, or compensatory growth. Increased competition (relatively high SS) was evident during feeding in fish maintained at low to moderate but not at ad libitum prey levels. Our findings provide estimates of prey resources required to fuel in situ growth and help characterize metabolic strategies of European sprat within variable feeding environments.

Fisheries and aquatic resources are economically, ecologically, culturally and aesthetically impo... more Fisheries and aquatic resources are economically, ecologically, culturally and aesthetically important to the nation. From the global perspectives, the main issues facing by the international fishing community generally are over fishing, overcapacity, by-catch management as well as environmental degradation. The combined effect of these factors that have made 60-70 % of the major world fisheries resources are in urgent need of management action to restrict the increase in fishing capacity and to rehabilitate damaged resources (FAO, 1991). In Bangladesh, fisheries is one of the major sub-sectors of agriculture, which play a dominant role in nutrition, employment, earning foreign currency and other areas of economy. This sub-sector contributes about 80% to the national animal protein intakes, nearly 6 % to the

Abstract.-This study describes a new approach for assessing toxic response behaviour of Caenorhab... more Abstract.-This study describes a new approach for assessing toxic response behaviour of Caenorhabditis elegans by automatic recognition of line movement through an image-processing system. The movement behaviour of this nematode is different even at low concentrations of formaldehyde. A comparison of the response behaviour of this animal at different concentrations of formaldehyde has shown concentration-dependent toxicity. This study has identified some sequential line-movements on nematodes that confirmed the toxicological effect on nematode behaviour.

Abstract.-The contamination of heavy metals, such as chromium (Cr), iron (Fe), cobalt (Co), nicke... more Abstract.-The contamination of heavy metals, such as chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), cadmium (Cd) and lead (Pb) were evaluated in the water and tissues of African catfish Clarias gariepinus and Sabaki tilapia Oreochromis spilurus from Wadi Hanifah, Riyadh. The samples were collected from three sampling sites (Namar, Al-Masani and Al-Hair) of Wadi Valley of central Saudi Arabia during May-June 2013. The water and fish samples collected from Al-Masani, nearby a vehicle mechanical industrial area, were found to be more contaminated by Cr, Fe, Zn and Pb than those of other sampling sites. The high concentrations of Fe were detected in all the water and fish samples, followed by Zn, Pb, Cr, Co, Ni and Cd. However, none of the detected HM (heavy metals) concentrations were exceeded the permissible limits set by the different authorities. The estimated daily intake was found to be below the provisional tolerable daily intake (PTDI), established by the FAO and...

2 Abstract: The studies on length-weight relationships (LWR), condition factors (K) and sex-ratio... more 2 Abstract: The studies on length-weight relationships (LWR), condition factors (K) and sex-ratio of Nile tilapia, Oreochromis niloticus in Wadi Hanifah, Riyadh, Saudi Arabia was conducted from September 2011 to August 2012. A total of 575 specimens were collected from different sample stations using different types of net and by angling. The fishes were ranged from 76-273 mm, 69-261 mm and 69-273 mm in length for male, female and combined sex respectively, while weight ranged 14.8-430 g for male, 13.1-402 g for female and 13.1-430 g for combined sex. The values of regression coefficient for length-weight relationship are 3.16, 2.98 and 3.01 for male, female and combined sex respectively. This indicated that positive allometric growth for all sexes. The mean values of condition factor were calculated as 1.16, 1.02 and 1.09 for male, female and combined sex respectively that indicated healthy condition of fish. There is no significant different in male and female distribution of O. n...

Bangladesh Journal of Botany, 2010

Seed-cotyledons of Vicia faba L. an unconventional legume from Bangladesh were analyzed for chemi... more Seed-cotyledons of Vicia faba L. an unconventional legume from Bangladesh were analyzed for chemical composition and protein functionality to assess its potential usage as an alternative source of protein. Proximate component in per cent were crude protein 30.57, crude fat 3.22, crude fibre 2.73, ash 3.61 and carbohydrate 59.87. With the exception of methionine plus cystine, the essential amino acids in the seedcotyledons were present at concentrations equal to or greater than those commonly recommended. Least gelation concentration, water and fat absorption capacities were 8.00, 83.86 and 79.43%, respectively. Foaming capacity and foaming stability were 57.19 and 29.78%, respectively. With respect to its nutritive composition and functionality, the pulse appeared to be a potential source of nutrient. Key words: Vicia faba ; Chemical composition; Functional properties; Legumes; Bangladesh DOI: 10.3329/bjb.v38i1.5129 Bangladesh J. Bot. 38 (1): 93-97, 2009 (June)

The study was conducted to assess heavy metals concentrations in water, sediment and white shrimp... more The study was conducted to assess heavy metals concentrations in water, sediment and white shrimp (Liptopenaeus vannamei) of Red Sea, Jizan, Saudi Arabia, using ICP-MS. The concentrations of heavy metals in water were above the recommended drinking water standards setup by the WHO/USEPA (World Health Organization/United States Environmental Protection Agency). However the concentrations of heavy metals in sediment and white leg shrimp were lower than the recommended levels proposed by WHO/USEPA, except Cr level in shrimp muscle. The level of contamination degree (Cd) and modified contamination degree (mCd) indicated ‘low’ and ‘very low’ degree of contamination respectively. Pollution load index (PLI) of the studied area was lower than unity, indicated no pollution. Furthermore, a toxic response factor was applied to determine the potential ecological risk index (RI) of these heavy metals into the water body. The results of this study exhibited a low potential ecological risk of heav...

The infrared spectra of xPbO (1-x-z)SiO 2 zP 2 O 5 glasses with a PbO:SiO 2 molar ratio of 3:2 an... more The infrared spectra of xPbO (1-x-z)SiO 2 zP 2 O 5 glasses with a PbO:SiO 2 molar ratio of 3:2 and z=0,1,2,5,30,40 and 50 mol% have been examined in the region 4000-400 cm - 1 , together with XRD. The structure of PbO-SiO 2 binary glass is significantly different from that of P 2 O 5 substituted glasses. The low amount of P 2 O 5 containing PbO-SiO 2 glasses results in infrared spectra of the same pattern as 3:2 binary lead silica glass but the maximum peak intensities and positions are different. The spectra of high P 2 O 5 (30-50 mol%) containing glasses show an increased number of distinct peaks in the low frequency region with a convolution of several broad Gaussians in the high frequency region. All the spectra are base line corrected and deconvoluted to appropriate number of Gaussians. The peaks and peak positions of the Gaussians are assigned to Si-O-Si, Si-O-Pb, Si-O-P, P-O-P, O-P-O, P=O, P-O - etc. bonds. A variation in the band positions and the relative amounts of bonds w...

Semi-empirical formulae BEBA, BEB and Pattard-Rost models are employed to compute the total cross... more Semi-empirical formulae BEBA, BEB and Pattard-Rost models are employed to compute the total cross-section of single ionization of Si + , Si + + and Cr 7 + ions by electron impact. The parameters of the semi-empirical formulae are obtained by fitting with the experimental data over a wide range of energy. It is found that, the semi-empirical formulae provide excellent fit, while the BEBA and BEB models give qualitative fit to the experimental data. The parameter-free Pattard-Rost model is in fairly good agreement with the data.

Chemosphere, 2017

Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria canno... more Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se(0)) under both aerobic and anaerobic conditions. The biogenic nano-Se(0) converted 45.8-57.1% and 39.1-48.6% of elemental mercury (Hg(0)) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively. Addition of sodium dodecyl sulfonate enhanced Hg(0) remediation, probably owing to the release of intracellular nano-Se(0) from the bacterial cells for Hg fixation. The reaction product after remediation was identified as non-reactive HgSe that was formed by amalgamation of nano-Se(0) and Hg(0). Biosynthesis of nano-Se(0) both aerobically and anaerobically therefore provides ...

Fisheries and Aquaculture Journal, 2015

Fasciola hepatica was reported for the first time from the faecal sample of a 60 years old man du... more Fasciola hepatica was reported for the first time from the faecal sample of a 60 years old man during the survey of human intestinal parasitic infections in Swat, Pakistan. The man belonged to shepherd community of Swat.

Journal of the Science of Food and Agriculture, Apr 5, 2009

BACKGROUND: Increasing global protein consumption has led to the demand for new sources of food p... more BACKGROUND: Increasing global protein consumption has led to the demand for new sources of food protein, particularly plant sources. Many inexpensive but protein-rich bean cultivars have not been well evaluated and are thus underutilised. In this study the physicochemical and functional properties of seeds of ten seem cultivars were assessed. RESULTS: In agreement with their sizes, seeds of Airet had the highest 1000-seed weight and volume, while those of Bari had the lowest. In terms of proximate composition (g kg −1), protein content ranged from 240.08 (Ashina) to 292.63 (Puti), fat content from 31.47 (Goalgadda) to 38.40 (Puti), ash content from 32.80 (Puli) to 45.53 (Goalgadda) and fibre content from 21.90 (Tatulia) to 28.90 (Noldog). Hydration (g kg −1) and swelling (mL L −1) capacities ranged from 1688.60 and 1850.43 (Goalgadda) to 1999.40 and 2208.66 (Rupbhan) respectively. Similarly, cooking time (min) varied from 114 (Rupbhan) to 179 (Goalgadda). Lowest gelation concentration was in the range 80-100 g kg −1. Water and fat absorption capacities (g kg −1) ranged from 941.00 and 644.44 (Ashina) to 1043.33 and 749.26 (Puti) respectively. Foaming capacity and stability (mL L −1) ranged from 443 (Puli) to 635 (Puti) and from 314 (Ashina) to 643 (Rupbhan) respectively. CONCLUSION: Seeds of seem cultivars appear to be a promising food in terms of their protein content and functionality.