Cadmium(Cd)and arsenic(As)co-contamination has threatened rice production and food safety.It is challenging to mitigate Cd and As contamination in rice simultaneously due to their opposite geochemical behaviors.Mg-loa...Cadmium(Cd)and arsenic(As)co-contamination has threatened rice production and food safety.It is challenging to mitigate Cd and As contamination in rice simultaneously due to their opposite geochemical behaviors.Mg-loaded biochar with outstanding adsorption capacity for As and Cd was used for the first time to remediate Cd/As contaminated paddy soils.In addition,the effect of zero-valent iron(ZVI)on grain As speciation accumulation in alkaline paddy soils was first investigated.The effect of rice straw biochar(SC),magnesiumloaded rice straw biochar(Mg/SC),and ZVI on concentrations of Cd and As speciation in soil porewater and their accumulation in rice tissueswas investigated in a pot experiment.Addition of SC,Mg/SC and ZVI to soil reduced Cd concentrations in rice grain by 46.1%,90.3%and 100%,and inorganic As(iAs)by 35.4%,33.1%and 29.1%,respectively,and reduced Cd concentrations in porewater by 74.3%,96.5%and 96.2%,respectively.Reductions of 51.6%and 87.7%in porewater iAs concentrationswere observed with Mg/SC and ZVI amendments,but notwith SC.Dimethylarsinic acid(DMA)concentrations in porewater and grain increased by a factor of 4.9 and 3.3,respectively,with ZVI amendment.The three amendments affected grain concentrations of iAs,DMA and Cd mainly by modulating their translocation within plant and the levels of As(Ⅲ),silicon,dissolved organic carbon,iron or Cd in porewater.All three amendments(SC,Mg/SC and ZVI)have the potential to simultaneously mitigate Cd and iAs accumulation in rice grain,although the pathways are different.展开更多
Bones can fulfill functions in movement,attachment,and protection of internal organs.Bone diseases caused by ageing,trauma,infection,and other reasons may seriously affect the daily life of patients.Magnesium ions are...Bones can fulfill functions in movement,attachment,and protection of internal organs.Bone diseases caused by ageing,trauma,infection,and other reasons may seriously affect the daily life of patients.Magnesium ions are closely associated with the maintenance of bone health.Integrating magnesium ions into delivery systems and hydrogels can improve their application,thus directly acting on the osteoblast cell lineage and influencing the proliferation and differentiation of relevant cells.The slow release of magnesium ions allows for their effects on the target site for a long time,reducing the clearance of magnesium ions in the body,which significantly contributes to bone repair.Magnesium-based bioalloy scaffolds have received widespread attention for their favourable biocompatibility,degradability,and boneforming properties and play an important role in bone regeneration and repair.This article presents a review on the role and mechanism of magnesium-containing materials in bone repair and regeneration.By discussing the current challenges and future directions for magnesium-containing biomaterials,new insights are provided into the development of these materials in the field of orthopaedics.In conclusion,magnesium-containing biomaterials have great application value in orthopaedics.展开更多
基金supported by the National Key Research and Development Program of China(No.2021YFC1809205)the Beijing Natural Science Foundation(No.8232029)the National Natural Science Foundation of China(No.41501336).
文摘Cadmium(Cd)and arsenic(As)co-contamination has threatened rice production and food safety.It is challenging to mitigate Cd and As contamination in rice simultaneously due to their opposite geochemical behaviors.Mg-loaded biochar with outstanding adsorption capacity for As and Cd was used for the first time to remediate Cd/As contaminated paddy soils.In addition,the effect of zero-valent iron(ZVI)on grain As speciation accumulation in alkaline paddy soils was first investigated.The effect of rice straw biochar(SC),magnesiumloaded rice straw biochar(Mg/SC),and ZVI on concentrations of Cd and As speciation in soil porewater and their accumulation in rice tissueswas investigated in a pot experiment.Addition of SC,Mg/SC and ZVI to soil reduced Cd concentrations in rice grain by 46.1%,90.3%and 100%,and inorganic As(iAs)by 35.4%,33.1%and 29.1%,respectively,and reduced Cd concentrations in porewater by 74.3%,96.5%and 96.2%,respectively.Reductions of 51.6%and 87.7%in porewater iAs concentrationswere observed with Mg/SC and ZVI amendments,but notwith SC.Dimethylarsinic acid(DMA)concentrations in porewater and grain increased by a factor of 4.9 and 3.3,respectively,with ZVI amendment.The three amendments affected grain concentrations of iAs,DMA and Cd mainly by modulating their translocation within plant and the levels of As(Ⅲ),silicon,dissolved organic carbon,iron or Cd in porewater.All three amendments(SC,Mg/SC and ZVI)have the potential to simultaneously mitigate Cd and iAs accumulation in rice grain,although the pathways are different.
基金National Natural Science Foundation of China(Nos.82102568,82172432)Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515220111,2022B1515120046,2021A1515220037,2022A1515220165)+4 种基金Shenzhen Key Medical Discipline Construction Fund(No.SZXK023)Shenzhen“San-Ming”Project of Medicine(No.SZSM202211038)Shenzhen Science and Technology Program(No.JCYJ20220818102815033,No.KCXFZ20201221173411031,No.JCYJ20210324110214040,No.JCYJ20210324105806016)The Scientific Research Foundation of PEKING UNIVERSITY SHENZHEN HOSPITAL(No.KYQD2021099)Shenzhen High-level Hospital Construction Fund.
文摘Bones can fulfill functions in movement,attachment,and protection of internal organs.Bone diseases caused by ageing,trauma,infection,and other reasons may seriously affect the daily life of patients.Magnesium ions are closely associated with the maintenance of bone health.Integrating magnesium ions into delivery systems and hydrogels can improve their application,thus directly acting on the osteoblast cell lineage and influencing the proliferation and differentiation of relevant cells.The slow release of magnesium ions allows for their effects on the target site for a long time,reducing the clearance of magnesium ions in the body,which significantly contributes to bone repair.Magnesium-based bioalloy scaffolds have received widespread attention for their favourable biocompatibility,degradability,and boneforming properties and play an important role in bone regeneration and repair.This article presents a review on the role and mechanism of magnesium-containing materials in bone repair and regeneration.By discussing the current challenges and future directions for magnesium-containing biomaterials,new insights are provided into the development of these materials in the field of orthopaedics.In conclusion,magnesium-containing biomaterials have great application value in orthopaedics.
