Dongping Lake area,located in the lower reaches of Yellow River,is an ideal place to study the changes of modern river and lake sedimentary environment.The sediment samples of Dawen River,Yellow River,and Dongping Lak...Dongping Lake area,located in the lower reaches of Yellow River,is an ideal place to study the changes of modern river and lake sedimentary environment.The sediment samples of Dawen River,Yellow River,and Dongping Lake were collected,and the major elements,trace elements and organic matter geochemical composition of the samples were analyzed.Cluster analysis,characteristic element ratio method and graphic method were used to explore the geochemical characteristics of sediments and their environmental implication.The results show that the contents of SiO_(2),Na_(2)O,TiO_(2) and Zr in sediments of Dawen River and Yellow River are relatively high,and the contents of iron and manganese oxides,organic matter,CaO,P2O5 and Sr in lake sediments are relatively high.That reveals the differences of sedimentary environments between the rivers and the lake.The contents of Sr and Zr in Dawen River are affected by the rapid migration of clastic materials in the upstream carbonate source area during the flood season;the δCe,ΣREE and REE’s ratios in the sediments of the Yellow River reflect the influence of the Loess source;and the distribution of elements changes along the flow direction during the flood season.The characteristics of pH,element composition and LREE&HREE fractionation of the lake sediments indicate that the sediment source is complex,and the lake environment is affected by the flood season.The study shows that the geochemical content and its variation characteristics of sediments effectively reveal the sedimentary environment,material composition and characteristics of flood season of rivers and the lake in the study area.展开更多
To the Editor：The t（9;22）（q34;q 11） （Philadelphia chromosome [Ph]） balanced translocation results in fusion of the BCR gene at 22q11 with cytoplasmic tyrosine kinase gene ABL1 and plays an essential role in leu...To the Editor：The t（9;22）（q34;q 11） （Philadelphia chromosome [Ph]） balanced translocation results in fusion of the BCR gene at 22q11 with cytoplasmic tyrosine kinase gene ABL1 and plays an essential role in leukemic transformation.The Ph is an infrequent finding in de novo acute myeloid leukemia （AML）,approximately 0.5-3% of newly diagnosed patients. The World Health Organization （WHO） recently released a revised version of the Classification of Hematopoietic and Lymphoid Malignancies,a new provisional category of AM L with BCR-ABL1 was added to recognize these rare Ph AML cases that could benefit from tyrosine-kinase inhibitor （TKI） therapy. It is required to enlarge the sample size and research the molecular or genomic features to increase the argument in favor ofPh AML as a real entity.展开更多
基金This study was supported by Opening Fund of Provincial Key Lab of Applied Nuclear Techniques in Geosciences(No.201904)Key Scientific and Technological Project(No.KY201957)of Shandong Bureau of Geology and Mineral Resources.
文摘Dongping Lake area,located in the lower reaches of Yellow River,is an ideal place to study the changes of modern river and lake sedimentary environment.The sediment samples of Dawen River,Yellow River,and Dongping Lake were collected,and the major elements,trace elements and organic matter geochemical composition of the samples were analyzed.Cluster analysis,characteristic element ratio method and graphic method were used to explore the geochemical characteristics of sediments and their environmental implication.The results show that the contents of SiO_(2),Na_(2)O,TiO_(2) and Zr in sediments of Dawen River and Yellow River are relatively high,and the contents of iron and manganese oxides,organic matter,CaO,P2O5 and Sr in lake sediments are relatively high.That reveals the differences of sedimentary environments between the rivers and the lake.The contents of Sr and Zr in Dawen River are affected by the rapid migration of clastic materials in the upstream carbonate source area during the flood season;the δCe,ΣREE and REE’s ratios in the sediments of the Yellow River reflect the influence of the Loess source;and the distribution of elements changes along the flow direction during the flood season.The characteristics of pH,element composition and LREE&HREE fractionation of the lake sediments indicate that the sediment source is complex,and the lake environment is affected by the flood season.The study shows that the geochemical content and its variation characteristics of sediments effectively reveal the sedimentary environment,material composition and characteristics of flood season of rivers and the lake in the study area.
基金This work was supported by grants from the National Natural Science funds （No. 81500103）, Natural Science Foundation of Jiangsu Province （BK-20151230）, and the high-level medical talents training project （No. 2016CZLJ027）.
文摘To the Editor：The t（9;22）（q34;q 11） （Philadelphia chromosome [Ph]） balanced translocation results in fusion of the BCR gene at 22q11 with cytoplasmic tyrosine kinase gene ABL1 and plays an essential role in leukemic transformation.The Ph is an infrequent finding in de novo acute myeloid leukemia （AML）,approximately 0.5-3% of newly diagnosed patients. The World Health Organization （WHO） recently released a revised version of the Classification of Hematopoietic and Lymphoid Malignancies,a new provisional category of AM L with BCR-ABL1 was added to recognize these rare Ph AML cases that could benefit from tyrosine-kinase inhibitor （TKI） therapy. It is required to enlarge the sample size and research the molecular or genomic features to increase the argument in favor ofPh AML as a real entity.
