Heavy metal pollutant induced changes in some biochemical parameters in the freshwater fish Clarias batrachus L

The data on the effects of Hg(II), As(V) and Pb(II) on the biochemical parameters of the freshwater fish. Clarias batrachus L., showed an increased protein content in the liver, kidney, stomach, intestine, testis and ovary, and a decreased content of it in the muscle as compared to control values. A decrease in dry weight and an increase in free amino acid and tissue permeability were recorded in all the organs after treatment with Hg(II), As(V) and Pb(II). In general, the organs were affected by the treatments in the order: Pb(II) greater than As(V) greater than Hg(II) and their effects were pronounced in the liver and kidney, followed by intestine, stomach, muscle, testis and ovary of the species.     

Concrete Crack Restoration Using Bacterially Induced Calcium Metabolism

Concrete structures are prone to develop cracks and cause devastation. Repair and renovation are not enough to ensure complete eradication of crack development. The entire process is costly and laborious. The microbiologically induced calcium carbonated precipitation can be effective in restoring the cracks. The calcium-based nutrients along with specific bacterial strain have been used in the present investigation. The pellets of calcium as per Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy are deposited in the cracks of the concrete over a period of 7 days of incubation. The presence of bacteria in the calcium precipitates as demonstrated by scanning electron microscope provides adequate strength and adhering quality to the pellets. The effective filling of cracks is confirmed with the help ultrasonic pulse velocity test also. Since, elephantine heritage and high sky buildings have high maintenance costs, the use of present technique will cut down the cost and duration of restoration.Supplementary InformationThe online version of this article (10.1007/s12088-020-00916-0) contains supplementary material, which is available to authorized users.