சுற்றுச்சூழல் பகுப்பாய்வு வேதியியல் இதழ்

This study evaluated the bioremediation potential of klebsiella species. Different strains were isolated from selected polluted soil using pour plate method and were subjected to various morphological and biochemical tests. The bioaccumulation experiment was done using selected metal salt solution. Heavy metals polluted soil samples were subjected to acid extraction (HCl:HNO₃, 3:1 v/v) before the addition and after the removal of each specie to evaluate the residual metal concentrations after remediation using atomic absorption spectrometer. Chemical functional groups present in each species were identified using Fourier Transform Infrared (FT -IR) analysis. The percentage removal efficiency by each strain of metal ion from their salt solution show Klebsiella pneumoniae with 67.19% of Cd, Klebsiella edwardsii with 27.56, 58.30% of Cr and Ni, Klebsiella ozoenae with 67.71, 62.09% of Pb and Cu ions removal. Remediation of polluted soil samples by each Klebsiella species shows effective percentage reduction of metal concentrations in each sample. The Fourier Transform Infrared (FT-IR) analysis of these species affirmed the occurrence of (-OH stretch), (Sp³ –CH stretch), (Sp² –CH stretch), (C-O stretch), (N-O stretch), (C-Br/Cl/F stretch) which were responsible for both absorption and adsorption mechanisms. The study concluded that Klebsiella species were effective in reducing heavy metals concentration in polluted soil and would be a good alternative to conventional methods.

Biological systems face both nearby risks, like over-abuse, and worldwide perils, for example, environmental change. Since the effect of neighborhood perils lessens with distance from people, nearby elimination chance ought to diminish with distance, making distant regions places of refuge for biodiversity. Nonetheless, disengagement and diminished anthropogenic aggravation might increment environmental specialization in far off networks, and thus their weakness to optional impacts of variety misfortune proliferating through organizations of connecting species. We demonstrate this to be valid for reef fish networks across the globe. An expansion in fish-coral reliance with the distance of coral reefs from human settlements, matched with the broad effects of worldwide dangers, builds the gamble of fish species misfortune, neutralizing the advantages of distance. Focal points of fish risk from fish-coral reliance are unmistakable from those brought about by direct human effects, expanding the quantity of chance areas of interest by ~30% all around the world. These discoveries could apply to different biological systems on the planet and portray a reality where no spot, regardless of how remote, is ok for biodiversity, requiring a reexamination of worldwide protection needs.