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1
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Content available

Parasites of markhor, urial and Chiltan wild goat in Pakistan

100%
Ahmed S.
Annals of Parasitology
|
2020
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tom 66
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nr 1
2

Performance of single-chamber microbial fuel cells using different carbohydrate-rich wastewaters and different inocula

51%
Ahmed S., Rozaik E., Abdel-Halim H.
Polish Journal of Environmental Studies
|
2016
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tom 25
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nr 2
A microbial fuel cell (MFC) can use wastewater as a substrate; hence, it is essential to understand its performance when seeded with different inocula and during the treatment of carbohydrate-rich wastewaters to simultaneously optimize electricity production and wastewater treatment. This study investigates the performance of single-chamber membraneless MFCs used to treat three different carbohydrate-rich synthetic wastewaters (glucose, sucrose, and soluble starch) while seeding with two different inocula (a microbial solution containing different species of microorganisms, and anaerobic sludge). The results showed that the highest voltages, power densities, and COD removal effi ciencies were obtained using microbial fuel cells fed with glucose-based synthetic wastewater, and were 351 mV, 218 mW/m2, and 98.8%, respectively, for the microbial solution, and 508 mV, 456.8 mW/m2, and 94.3%, respectively, for the anaerobic sludge. The lowest results of voltages, power densities, and COD removal effi ciencies were obtained using microbial fuel cells fed with the soluble starch-based synthetic wastewater, and were 281 mV, 139.8 mW/m2, and 86.4%, respectively, for the microbial solution, and 396 mV, 277.6 mW/m2, and 79.4%, respectively, for the anaerobic sludge. In all experiments, the voltages and power densities obtained for the anaerobic sludge were higher than those obtained for the microbial solution, and the COD removal effi ciencies obtained for the anaerobic sludge were less than those obtained for the microbial solution. This study determined that voltage generation, power densities, and COD removal effi ciencies were inversely proportional to the complexity of the carbohydrate used in single-chamber microbial fuel cells.
3

Decolorization of textile dye Reactive Blue 221 by bacteria isolated from anthropogenic dye-contaminated soil

51%
Mumtaz S., Malik N. H., Naz I., Ahmed S.
Polish Journal of Environmental Studies
|
2015
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tom 24
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nr 4
The present study was conducted to evaluate the degradative potential of indigenous bacterial isolates for Reactive Blue 221. The two strains proficient in decolorization (>80%) were isolated from a waste disposal site by enrichment technique. Under optimized conditions, Pseudomonas sp. BDS 2 displayed efficient decolorization activity of 94.4% in Minimal Salt Medium supplemented with 50 mg/1 of RB 221 after 96 h of incubations, whereas 88.5% of color was removed by Alcaligenes sp. BDS 9 by the end of 112 h. UV-Visible and FTIR spectroscopy confirmed that in the case of Pseudomonas sp. BDS 2 and Alcaligenes sp. BDS 9, decolorization was the ultimate consequence of biodegradation and adsorption, respectively. Toxicological studies revealed the nontoxic nature of degradative metabolites.
4

Design and analysis of a graphene-based Tera-Hertz antenna with lower complexities

51%
Islam M. M., Ahmed S., Mahmud N.
World Scientific News
|
2019
|
tom 125
5

Effects of hydraulic retention time (HRT) on the performance of a pilot-scale trickling filter system treating low-strength domestic wastewater

45%
Rehman A., Ayub N., Naz I., Perveen I., Ahmed S.
Polish Journal of Environmental Studies
|
2020
|
tom 29
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nr 1
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria

45%
Ahmed S., Rahman S., Hasan M., Paul N., Sajib A. A.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2018
|
tom 99
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nr 2
7

Production and characterization of esterase in Lantinus tigrinus for degradation of polystyrene

39%
Tahir L., Ali M. I., Zia M., Atiq N., Hasan F., Ahmed S.
Polish Journal of Microbiology
|
2013
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tom 62
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nr 1
Polystyrene is considered stable to biological degradation. Lantinus tigrinus isolated from wood sample produced esterase in growth medium under normal conditions. However, acidic medium, 37°C temperature, presence of tween 80; and urea and yeast extract in mineral salt medium enhance the production of esterase and specific activity. Purified esterase was active at broad pH range and 45°C. FTIR analysis confirmed that esterase produced by Lantinus tigrinus effectively degraded polystyrene film and broke macromolecules down to non-toxic molecules. This study concludes that the presence of Lantinus tigrinus at dumping sites can be exploited for waste management containing high molecular weight synthetic polymers.
8

Bioremediation of oil-based paint from aqueous media by novel indigenous Brevibacillus parabrevis strain NAP3 and its toxicity assessment

39%
Phulpoto A. H., Qazi M. A., Mangi S., Ahmed S., Ul-Haq I., Phul A. R., Kanhar N. A.
Polish Journal of Environmental Studies
|
2017
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tom 26
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nr 1
The present study sought to explore the bioremediation of oil-based paint from aqueous media using indigenous bacterial isolate Brevibacillus parabrevis strain NAP3 and its toxicity assessment against prokaryotic and eukaryotic biological models. The bacterial isolate was initially screened for bioremediation potential in mineral salts medium containing oil-based paint (conc. 300 ppm, w/v) under shake flask settings. Moreover, the percentage removal of oil-based paint from aqueous media was investigated using a spectrophotometer at 285 nm under two different experimental conditions, i.e., with and without glucose. Evidently, the bacterial isolate displayed maximum oil-based paint removal of 83% in flasks containing glucose as an additional carbon source after 14 days of the treatment, whereas without glucose supplementation it reached up to 78%. The Fourier transform infrared (FTIR) spectra showed noticeable biodegradative changes of the oil-based paint relevant to peaks in the wave number frequency range of 800-600 cm⁻¹, 1,034 to 1,299 cm⁻¹, 1,690 to 1,725 cm⁻¹, 2,857 to 3,000 cm⁻¹, and 3,200 to 3,400 cm⁻¹ (corresponding to C-H, C-O-N, C-O-C, and CH₂ aliphatic stretch and terminal CH₃ bonds, and N-H bonds, respectively, in treated samples as compared to controls; non-inoculated samples). After treatment, the cellfree supernatants containing oil-based paints displayed reduced cytotoxicity against brine shrimp larvae, phytotoxicity against wild reddish seeds, and antimicrobial activity against selected pathogenic bacteria and fungi, which indicated the possible use of B. parabrevis as potential oil-based paint-degrading bacterium in order to restore paint-polluted environments.
9

Estimating anticipated performance index and air pollution tolerance index of some trees and ornamental plant species for the construction of green belts

33%
Leghari S. K., Akbar A., Qasim S., Ullah S., Asrar M., Rohail H., Ahmed S., Mehmood K., Ali I.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
This study combines air pollution tolerance index (APTI) and anticipated performance index (API) in order to determine the potential of trees and ornamental shrubs that are frequently growing on the roads of Quetta, Pakistan, and the campus of the University of Balochistan, in Quetta, for green belt development. Our investigation exposed that not only APTI is suitable for the fitness of trees for building green belts. It is used to categorize vulnerable plant species for only bio-monitoring. The grouping of APTI and API in the present study is a practical technique for decreasing air pollution control. Laboratory analysis for APTI was carry out by the four physico-biological factors such as leaf extract pH, total chlorophyll content, ascorbic acid content, and relative water content. API for different plant species (trees and ornamental shrubs) was determined depending upon the characteristic grading by allotted + or – to the plants. The standard for determining API is given in Table 2. For examining the relationships among these factors statistics were utilized. This study indicated that the APTI is used as an instrument for choosing suitable plants to reduce environmental urban heat. API designated that Morus alba L., Pinus halepensis Miller, Ficus carica L., and Pistacia vera L. with API = 6 are excellent performers for green belt development. Morus nigra L. and Malus pumila Miller had API 5 and are considered very good performers, and Fraxinus angustifolia Vahl., Prunus armeniaca L., and Platycladus orientalis L. showed 4 API values with good performance for green belt formation. All the other remaining investigated trees and ornamental shrubs demonstrated poor values of API and are not recommended for green belts as they act as bio-indicators. Data also exhibited that all the examined trees had higher API values then the ornamental shrubs. This study suggested that the integration of both APTI and API of plants is extremely beneficial for the construction of green belts.
10

Change in total phenolic content and antibacterial activity in regenerants of Vitex negundo L.

33%
Ahmad N., Khan M. I., Ahmed S., Javed S. B., Faisal M., Anis M., Rehman S., Umair S. M.
Acta Physiologiae Plantarum
|
2013
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tom 35
|
nr 03
A valuable medicinal plant, Vitex negundo L. has been investigated for its regeneration potential using shoot tip explants. Out of a range of concentrations of cytokinins [6-benzyl adenine (BA), 6-furfurylaminopurine, 2-isopentenyl adenine] used as supplement to Murashige and Skoog medium (MS), BA at 5.0 μM concentration proved best for multiple shoot induction yielding 3.60 ± 0.50 shoots after 8 weeks of culture. Inclusion of a low concentration of an auxin with optimal cytokinin concentration favoured shoot multiplication and the optimum response was observed on MS medium supplemented with BA (5.0 μM) along with a Naphthalene acetic acid (0.5 μM), where 65.0 ± 1.73 % cultures responded with a mean number of 4.80 ± 0.58 shoots per explants after 8 weeks of culture. Ex vitro rooting of in vitro derived microshoots was achieved upon dipping the cut ends of microshoots in 500 μM indole-3-butyric acid for 10 min followed by transfer to thermocol cups containing sterile soilrite. About 95 % of the plantlets survived the acclimatization procedure and were transferred to greenhouse and finally to field. Screening of the antibacterial activity and estimation of total phenolic content of ethanolic extracts of micropropagated plants were also carried out and compared with that of the mother plant.
11
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Content available

Boron facilitates rice growth, development, and related attributes under saline soil conditions

33%
Uddin R., Nuruzzaman M., Briste P. S., Islam M., Bhuiyan A. K., Joy I. H., Ahmed S., Khatun A.
Acta Agrobotanica
|
2021
|
tom 74
|
nr 1
12
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Content available

Motijheel Lake - victim of cultural eutrophication

27%
Biswas M., Mandal D., Sonar R., Dey B., Ghosh S., Ghosh S., Chattarjee J., Bhattacharyya B., Saha I., Ahmed S., Basu A.
World News of Natural Sciences
|
2018
|
tom 21
Destruction of natural water bodies due to cultural eutrophication is a predominant problem in India. Motijheel Lake of Murshidabad district is an environmentally, economically and historically significant water body. However, Anthropogenic activities including unplanned settlements around this lake and its over exploitation have deteriorated its water quality to a great extent. Motijheel Lake acts as a sink for domestic sewage, human and animal excreta. Surface runoffs are discharged into the lake which further adds to the list of pollutants. High phosphate, nitrate and nitrite-Nitrogen and chlorophyll content of the lake categorizes it as hypereutrophic one. Also, the amount of phosphate, nitrite and iron present in Motijheel Lake exceed the permissible limit in drinking water, as prescribed by US Environmental Protection Agency and Bureau of Indian Standards. When the Below Poverty Line residents of the surrounding area consume such water, they become susceptible to various fatal diseases. The low level of Dissolved Oxygen in the lake water signifies huge amount of organic matter deposited in the lake and indicates the lake water to be poor in quality. The high load of coliform bacteria in the lake water further corroborates the deposition of domestic, human and animal wastes. If water with such high concentration of faecal coliform is consumed, it could lead to fatal gastrointestinal and enteric diseases.
13

Heptoprotective role of Artemisia scoparia Waldst. and kit against CCl4-induced toxicity in rats

27%
Waris T. S., Khan M. R., Shah N. A., Shuaib M., Hussain F., Ishaq M., Kamal Z., Zeb U., Ali S., Ahmed S., Hussain F.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 3
In this study, the methanol extract of Artemisia scoparia was evaluated for its protective potential against carbon tetrachloride (CCl₄)-induced hepatic toxicity. Seven groups of mature albino rats were used in the course of the experiment and each group was treated with specific doses of plant extract and CCl₄. Silymarin was used as a standard protective drug. The results of the experiment revealed that Artemisia scoparia plant extract was successful in fighting CCl₄ toxicity as it clearly reduced the elevated levels of liver serum markers (alkaline phosphatase and alkaline aminotransferase), lipid peroxidation, nitrite content, and H₂O₂ on one side while enhancing the levels of antioxidant enzymes (catalase, peroxidase, superoxide dismutase, glutathione-s-transferase, γ-Glutamyltranspeptidase, and glutathione reductase) and protein content. It also protected DNA from the damaging effects of CCl₄. The findings of this study demonstrate that Artemisia scoparia plant extract plays a significant role in preventing the hepatic damages instigated with CCl₄ and can be used as a protective agent against oxidative stress-associated disorders.
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