Heavy‐metals contamination in lakes has a negative impact on lake ecosystems. This review provides an insight into possible heavy‐metals remediation techniques for lake environments using different techniques, for example, physical, chemical, and biological methods. As a result of the non‐uniform and complex nature of lakes, the selection of the most suitable the heavy‐metals removal technique is a difficult task. Among these processes, biological processes are efficient to remove heavy metals and convert them into simpler forms. Biological remediation techniques are the most suitable for lakes with low levels of contamination and include processing by bioadsorbents such as plants, algae, fungi, and micro‐organisms. Physical and chemical remediation of heavy metals are expensive but show fast results. The combination of all remediation techniques increases the efficiency of the removal of heavy metals and improves overall lake performance. The development of remediation techniques is necessary for lakes in future.

IntroductionIdol immersion activity is one of the sources of heavy metal pollution in the lakes of India. Futala, Gandhisagar and Ambazari lakes of Nagpur city are highly involved with idol immersion activity.Case descriptionIn this study, water and Tilapia fish (Oreochromis mossambicus) of Futala, Gandhisagar and Ambazari lakes were analyzed for heavy metals by using inductively coupled plasma optical emission spectrometry (ICP-OES).Discussion and evaluationThe results were high compared with the Bureau of Indian Standards (BIS) for water quality and Food and Agriculture Organization (FAO)/World Health Organization (WHO) for fish. The results showed appreciable high levels of heavy metal as lead, cadmium, copper, iron and manganese in water and fish in study lakes. It was observed that Gandhi Sagar lake was more contaminated after the idol immersion activity. Concentrations of Pb and Cd in fish of Gandhisagar lake were found high levels, ranged 0.83 and 0.47 μg/g respectively.ConclusionThe results of the present investigation indicate the unsafe condition for human consumption and environmental health.

Consumption of energy is a determinant of the socioeconomic status of many citizens across the globe. The majority of rural households in India are dependent on biomass fuels. Existing data on the factors affecting fuel switching in rural India are insufficient to analyze a behavioral change among families. This paper evaluates the influence of four variables income, education, cost of fuel, and clean fuel supply on fuel adoption decisions. To understand the study population's behavioral change, a Household Survey is conducted in 20 villages (in India's rural district). Along with field observation, data are also collected on energy usage at the household level using a formal questionnaire. Binary logistic regression is applied to establish a link between the variables. Both biomass fuels and Liquefied Petroleum Gas are used mostly for cooking. The prevalence of energy stacking behavior is observed even among middle and upper‐income families. Modest evidence for the “energy ladder” hypothesis is seen, however, a “switch over” to cleaner fuels is not.

Gills and muscles of Tilapia fish from Naik lake of Nagpur city were estimated for heavy metals (Zinc, Lead, Nickel, Copper and Cadmium) using inductively coupled plasma optical emission spectrometry (ICP-OES). Results showed higher concentrations of heavy metals in gills than in muscles of tilapia fish. Trends of heavy metal concentrations in gills and muscles of tilapia fish were found Zn > Pb> Ni> Cu >Cd. Highest lead and cadmium levels in muscles of the fish were 83±0.07 µg/g dw and 13±0.21 µg/g dw respectively. These levels were above the maximum permissible limits of Food and Agriculture Organization (FAO)/World Health Organisation (WHO). The results confirmed that tilapia fish from Naik lake are not safe for human consumption. Further, the health risks related to Zn, Pb, Ni, Cu and Cd were assessed based on target hazard quotients (THQ). The health risks from lead and cadmium were found to be the highest among all heavy metals in the study. THQ values of lead and cadmium were 4.0108, and 2.450, 0.818 and 2.57, 1.53 and 0.513 for person who eat tilapia fish from Naik lake five times, three times and once a week respectively. Maximum allowable daily consumption rate (CR lim ) for lead and cadmium in tilapia fish from Naik Lake was 0.0015 kg/day and 0.0024 kg/day respectively. Highest allowable weekly (CR wm ) and monthly (CR mm ) consumption rates for lead and cadmium in tilapia fish from Naik Lake were 0.0105 kg/week , 0.0168 kg/week and 0.198 kg/month, 0.318 kg/month respectively. Above these values of highest allowable daily, weekly and monthly consumption rates for lead and cadmium are unsafe for inhabitant who eats tilapia fish from Naik lake. Health risk assessment of lead and cadmium in tilapia fish from Naik lake suggests that consumption of fish from Naik lake might be unsafe for humans. Regular assessment of heavy metals in fish in Naik lake must be conducted to assure food safety.

Chlamydomonas reinhardtii is a unicellular green alga, which has been used as a reference organism for identifying proteins. Five hundred hypothetical proteins in Chlamydomonas reinhardtii have been sequenced for knowing functions of the proteins in their families. Functions of Five hundred hypothetical proteins in Chlamydomonas reinhardtii were predicted using bioinformatics web tools. The web tools like CDD-BLAST, INTERPROSCAN and PFAM were used for the prediction of functions in the proteins by searching protein databases for the presence of conserved domains. The current study was useful in better knowing the functions of hypothetical proteins in Chlamydomonas reinhardtii and the various regulatory mechanisms, which interact to yield a final output from the system.