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Open research questions in Chromium effects and bioremediation

142 gap statements mined from Chromium effects and bioremediation papers in our 4.5M-paper local library, which holds 643 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The incorporation of phosphogypsum can enhance the performance of the modified biochar, but the optimal concentration of Cr(VI) needs to be determined. The paper also identifies the challenge of preserving the metabolic activity of S. saromensis W5 in the presence of high Cr(VI) concentrations.

    Mechanistic Insights Into Efficient Chromium Recovery using a Microcapsule System Based on Waste-Recycled Biochar and Sporosarcina saromensis W5 · 2026 · DOI

  • There is a need for more efficient and sustainable methods for chromium recovery. The conventional treatments for Cr(VI)-contaminated solutions have limitations, and the incorporation of phosphogypsum can enhance the complexation and precipitation ability of the biochar.

    Mechanistic Insights Into Efficient Chromium Recovery using a Microcapsule System Based on Waste-Recycled Biochar and Sporosarcina saromensis W5 · 2026 · DOI

  • Given the lack of evidence for genotoxicity or even homeostatic responses to Cr(VI) in the rat oral cavity and the absence of oral cancer risk in humans, oral toxicity criteria for Cr(VI) should not be based on oral cavity tumors in rats.

    Why rat oral cavity tumors should not be the basis of quantitative cancer risk assessment for oral exposure to hexavalent chromium · 2025 · DOI

  • Employing a combination of glycine betaine (GB) and arbuscular mycorrhizal fungi (AMF) in fenugreek to mitigate Cr toxicity has not been previously investigated in terms of genetics and ultrastructural parameters.

    Modulation of Morpho‐Physio and Genotoxicity Induced by Cr Stress via Application of Glycine Betaine and Arbuscular Mycorrhiza in Fenugreek · 2025 · DOI

  • The economic feasibility of Deinococcus-based bioremediation at commercial scale remains unproven. The 'transformation gap' may be a limitation for some Deinococcus species.

    Evaluating the scientific and regulatory case for the deployment of the radioresistant genus Deinococcus in bioremediation · 2026 · DOI

  • There is a need to investigate the bioremediation potential of native Bacillus isolates and their consortia against heavy metals. There is a lack of studies on the use of Bacillus isolates and their consortia for bioremediation of heavy metal contaminated environments.

    Insights into the bioremediation potential of native Bacillus isolates and their consortia against Iron, Cadmium and Chromium at pH 5.0 · 2026 · DOI

  • The lack of understanding of microbial species' adaptation to heavy metal contamination. The need for effective and environmentally friendly methods for heavy metal remediation.

    Functional characterization of CreA, ZnT, and MTase as key regulators of cadmium resistance in Paecilomyces lilacinus · 2026 · DOI

  • There is a need to explore the potential of indigenous bacteria for bioremediation of heavy metals in tannery effluent. The study addresses the gap by isolating and characterizing bacterial species from tannery effluent and evaluating their potential for bioremediation.

    Isolation and Molecular Characterization of Indigenous Bacteria from Tannery Effluent and Their Potential for Bioremediation of Heavy Metals · 2026 · DOI

  • The lack of understanding of the diversity of photoheterotrophic bacteria in eutrophic environments. The need for a comprehensive classification of the family Paracoccaceae.

    Stagnihabitans lacustris sp. nov., an Anoxygenic Photoheterotrophic Bacterium of the Family Paracoccaceae, Isolated from a Eutrophic Pond in Czechia · 2026 · DOI

  • The effects of Cr(VI) on cardiac development during embryogenesis remain poorly understood. There is a need to investigate the mechanisms of Cr(VI)-induced cardiotoxicity in non-mammalian vertebrate models.

    Hexavalent Chromium Exposure Disrupts Cardiac Development in Chicken Embryos Through Oxidative Stress and Activation of TGFβ1/COL3A1 Pathway in Chick Embryos · 2026 · DOI

  • Despite providing important mechanistic insights into Cr(VI)-induced developmental cardiotoxicity, certain limitations should be acknowledged.

    Hexavalent Chromium Exposure Disrupts Cardiac Development in Chicken Embryos Through Oxidative Stress and Activation of TGFβ1/COL3A1 Pathway in Chick Embryos · 2026 · DOI

  • While cadmium (Cd) is known to influence ARG transfer in pure cultures, the effects of arsenic (As) and As-Cd co-exposure on plasmid-mediated conjugation, especially in soil, remain unclear.

    Exposure to arsenic and cadmium promotes conjugative transfer of plasmid-borne antibiotic resistance genes among soil microbiota · 2026 · DOI

  • The lack of effective recycling methods for chromium-containing products results in significant metal waste entering the ecosystem. The increasing demand for chromium leads to higher chromium consumption and waste generation, posing risks to the ecological environment and life safety. The study had to mitigate the potential impact of stress and health status on the experimental outcomes.

    Effects of Hexavalent Chromium Exposure on Gut Microbiota and Kidney Metabolism · 2026 · DOI

  • There is a lack of research on the impact of Cr(VI) exposure on gut microbiota and kidney health. Prior studies have focused on the effects of metal pollutants on human health, but the effects on gut microbiota and kidney metabolism are not well understood.

    Effects of Hexavalent Chromium Exposure on Gut Microbiota and Kidney Metabolism · 2026 · DOI

  • One of the challenges is the negative impact of heavy metals on plant growth and productivity. Another challenge is the lack of sustainable and eco-friendly approaches to improve metal stress tolerance in crops. The study also highlights the challenge of understanding the underlying mechanisms of PGPR-mediated stress tolerance in rice.

    Plant growth-promoting rhizobacteria enhance metal tolerance in rice (Oryza sativa L.) under chromium and lead stress · 2026 · DOI

  • Further investigations under different crop species and environmental conditions are required, - The study only examined the effects of P. putida, B. amyloliquefaciens, and P.

    Plant growth-promoting rhizobacteria enhance metal tolerance in rice (Oryza sativa L.) under chromium and lead stress · 2026 · DOI

  • The efficiency of pristine biochar for Cr(VI) removal is limited by its relatively low SSA, few reactive functional groups, limited redox activity, and inadequate porosity. There is a need to improve the adsorption capacity and removal efficiency of biochar for Cr(VI) removal. The paper identifies the gap in the development of modified biochar with enhanced adsorption capacity and removal efficiency.

    Non-Noble Metal and Heteroatom Co-Doped Biochar for Cr(VI) Removal: Production, Mechanisms, and Performance Comparison · 2026 · DOI

  • The lack of effective bioremediation strategies for heavy metal contamination. The need to identify microbial isolates that can tolerate and degrade heavy metals.

    COMPARATIVE SCREENING OF HEAVY METAL-TOLERANT MICROORGANISMS FOR SUSTAINABLE ENVIRONMENTAL BIOREMEDIATION · 2026 · DOI

  • Hexavalent chromium [Cr(VI)] is an established human lung carcinogen, but the carcinogenesis mechanism is poorly understood.

    Acute particulate hexavalent chromium exposure induces DNA double-strand breaks and activates homologous recombination repair in rat lung tissue · 2024 · DOI

  • Limited agreement between MALDI-TOF and 16S rRNA gene sequence analysis, - MALDI-TOF library is designed primarily for identifying medically relevant pathogens, - The influence of species was too high to calculate a meaningful statistical…

    Antimicrobial and Metal Resistance Genes in Bacteria Isolated from Mine Water in Austria · 2025 · DOI

  • Further study on the relationship between metal resistance genes and antimicrobial resistance genes, - Investigation of the horizontal gene transfer of AMR and MR genes, - Analysis of the distribution of AMR and MR genes in different environmental…

    Antimicrobial and Metal Resistance Genes in Bacteria Isolated from Mine Water in Austria · 2025 · DOI

  • This study paves the way for further research into the cardioprotective properties of α-asarone and its potential application in clinical settings by specifically exploring the protective efficacy of α-asarone against Cr(VI)-induced cardiotoxicity and delineating the underlying biochemical and molecular mechanisms involved.

    Cardioprotective Effects of α-Asarone Against Hexavalent Chromium-Induced Oxidative Damage in Mice · 2024 · DOI

  • Further development of genetic engineering tools for Deinococcus. Investigation of the economic feasibility of Deinococcus-based bioremediation. Exploration of the potential applications of Deinococcus in bioremediation.

    Evaluating the scientific and regulatory case for the deployment of the radioresistant genus Deinococcus in bioremediation · 2026 · DOI

  • Further investigation of the molecular mechanisms underlying Cd 2+ tolerance in Paecilomyces lilacinus. Exploration of potential applications in environmental bioremediation strategies.

    Functional characterization of CreA, ZnT, and MTase as key regulators of cadmium resistance in Paecilomyces lilacinus · 2026 · DOI

  • Investigation of long-term stability and regeneration of modified BCs, - Exploration of other metal and heteroatom modifications for enhanced Cr(VI) removal, - Study of Cr(VI) removal mechanisms in complex environmental…

    Non-Noble Metal and Heteroatom Co-Doped Biochar for Cr(VI) Removal: Production, Mechanisms, and Performance Comparison · 2026 · DOI

Most-cited papers in Chromium effects and bioremediation

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Open questions raised by papers listed on this page include: (1) There is a need for more efficient and sustainable methods for chromium recovery (“Mechanistic Insights Into Efficient Chromium Recovery using a Microcapsule…”, 2026); (2) There is a need to investigate the bioremediation potential of native Bacillus isolates and their consortia against heavy metals (“Insights into the bioremediation potential of native Bacillus isolates and…”, 2026); (3) The lack of understanding of microbial species' adaptation to heavy metal contamination (“Functional characterization of CreA, ZnT, and MTase as key regulators of…”, 2026); (4) There is a need to explore the potential of indigenous bacteria for bioremediation of heavy metals in tannery effluent (“Isolation and Molecular Characterization of Indigenous Bacteria from Tannery…”, 2026); (5) The lack of understanding of the diversity of photoheterotrophic bacteria in eutrophic environments (“Stagnihabitans lacustris sp. nov., an Anoxygenic Photoheterotrophic Bacterium…”, 2026). 142 gap statements have been mined from Chromium effects and bioremediation papers in our 4.5M-paper local library, which holds 643 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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