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1

Uptake and leaching of Cu, Cd, and Cr after EDTA application in sand columns using sorghum and pearl millet

100%
Bareen F., Rafiq K., Shafiq M., Nazir A.
Polish Journal of Environmental Studies
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2019
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tom 28
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nr 4
In a greenhouse experiment using sand columns, sorghum and pearl millet were grown and spiked with metal solutions of Cu, Cd, and Cr in two concentrations. The chelating agent EDTA was applied to one-month-old plants and metal mobilization was observed through uptake by the plants or leaching through the columns during a period of one month. Growth was much better in pearl millet than sorghum under metal stress. Metal uptake was significantly higher in sorghum and was in the order root>shoot>leaves in both the plants. Metals were differentially mobilized in the order of Cu>Cr>Cd as shown by plant uptake and leaching through the columns. The root to shoot translocation of Cd was significantly improved after EDTA application, and to some extent for Cu but not for Cr. The leaching of metals was the maximum in the second week of application and was almost negligible by the fourth week conforming to the amount of EDTA detected in the leachate. Leaching of Cr differed in the maximum amount at the time of chelant application, while Cu and Cd showed maximum leaching after 7 days. As compared to sorghum, pearl millet was better at controlling leaching because of its extensive root system.
2

Effect of traffic exhaust on roadside trees during different seasons

100%
Iqbal M. Z., Shafiq M., Wajahat Ali Rizvi S.
Polish Journal of Environmental Studies
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1997
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tom 06
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nr 5
The effect of automobile pollutants on plants growing in Karachi during different seasons were studied. In response to the polluted environment, the phenology of Guiacum officinale and Peltophofum plerocarpum was highly affected at M. A. Jinnah road, the most polluted area of the city. Automobile emissions also significantly reduced the productivity of fruits and flowers in. G. officinale, whereas Azadirachta indica was found comparatively resistant to automobile emissions. The trees growing on the busy roads produced a significant effect on seed germination. The seeds of Albizia lebbeck showed significant reduction in germination as compared to Peltophorum plerocarpum. Effective identification of air pollutant sources and their accumulation in plants would be helpful for environmental protection. The findings would also be helpful for understading the ecological value of vegetation which maintains water, climatic conditions and protection from the hazardous effect of air pollutants.
3

Applying time series and a non-parametric approach to predict pattern, variability, and number of rainy days per month

76%
Khalil A., Ullah S., Khan S. A., Manzoor S., Gul A., Shafiq M.
Polish Journal of Environmental Studies
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2017
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tom 26
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nr 2
In the past 100 years, the annual global temperature has increased by almost 0.5ºC and is expected to increase further with time. This increase in temperature negatively affects the management of water resources globally as well as locally. Rain is an important phenomenon for agriculture, particularly in hilly areas where there is no feasible irrigation system. The present study is concerned with the analysis and modeling of the rain pattern, its variability, and prediction of monthly number of rainy days for the Abbottabad District, which is considered to be one of the greenest and most beautiful areas of Khyber Pakhtunkhwa, Pakistan, by incorporating both parametric and nonparametric techniques. Non-parametric statistical techniques are used for movement detection and significance testing; in this context, statistical tests were incorporated for inspection of homogeneity of rainy days among successive periods. A time series data for the period 1971-2013 was analyzed. Box Jenkins methodology and time series decomposition were applied for fitting the selected model, which was assessed for forecasting the monthly number of rainy days for 2015-2020. In this study several time series parametric and non-parametric approaches were applied to model rainfall data. The results showed that SARIMA (1, 0, 1) (0, 1, 1) was a better choice in predicting the monthly number of rainy days. Further analysis of the data suggests that January, March, May, July, and December have a considerable declining tendency in the number of rainy days.
4

The oxidative stress response of Mirabilis jalapa to exhausted engine oil (EEO) during phytoremediation

76%
Tabassum S., Shahid N., Wang J., Shafiq M., Mumtaz M., Arslan M.
Polish Journal of Environmental Studies
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2016
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tom 25
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nr 6
The current study elucidates the responses of a typical ornamental plant Mirabilis jalapa to exhausted engine oil (EEO) during phytoremediation. Greenhouse experiments were established to assess the plant’s response in terms of germination, biomass, chlorophyll content, superoxide dismutase (SOD) activity, catalase activity, soluble protein content, and hydrocarbon degradation at different concentrations of EEO (0.5 to 15 mL). Results illustrate that the increasing concentration of EEO reduced plant growth, whose responses were further confirmed by decreased chlorophyll content (chlorophyll a and b), high superoxide dismutase activity, lowered catalase activity, and reduced soluble protein content. Although the germination rate was successful in all the treatments, we observed a significant reduction in biomass – especially the elongation inhibition rate (>48.4%) – at EEO concentrations higher than 2%. Conclusively, the high toxicity index (40.4% to 93.3%) and lesser hydrocarbons degradation (36% to 10.8%) render the plant species unsuitable for future EEO phytoremediation experiments.
5

Heat exposure affected the reproductive performance of pregnant mice: enhancement of autophagy and alteration of subcellular structure in the corpus luteum

64%
Ullah S., Zhang M., Yu H., Mustafa S., Shafiq M., Wei Q., Wang W., Jan M., Mao D.
Reproductive Biology
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2019
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tom 19
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nr 3
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