In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We ex...In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We extracted morphological features through image enhancement techniques and calculated the dust activity parameter,Afρ,along with dust mass loss rates and coma color indices using broadband photometric data.Our morphological analysis uncovered a spectrum of dust characteristics among the observed comets,ranging from a significant twisted structure in comet 38P/Stephan-Oterma’s coma to the regular coma envelope surrounding comet 64P/Swift-Gehrels.The Afρvalues varied between 148.8±0.3 cm for 64P/Swift-Gehrels and1118.5±6.2 cm for C/2017 M4(ATLAS)(measured within a reference aperture radius ofρ=6″),indicating a range from moderate to high activity levels.Dust mass loss rates were estimated from 328.1 kg s^(-1)for comet 64P/Swift-Gehrels to 1395.5 kg s^(-1)for comet C/2017 M4(ATLAS).The color indices of comets 38P/Stephan-Oterma and C/2017 M4(ATLAS)closely resemble the average colors of active short-period comets and active longperiod comets,respectively.In contrast,64P/Swift-Gehrels exhibits a significantly bluer hue than typical Jupiter family comets.展开更多
AIM： To construct two kinds of anti-gastrin immunogen based on P64K protein from Neisseria rneningitids and to compare their immunogenic effect. METHODS： G17P64K gene was cloned and ligated into pET28a plasmid, then...AIM： To construct two kinds of anti-gastrin immunogen based on P64K protein from Neisseria rneningitids and to compare their immunogenic effect. METHODS： G17P64K gene was cloned and ligated into pET28a plasmid, then transformed into BL21（DE3）. After inoculation of LB medium and IPTG induction, the recombinant protein was solubly expressed at a high level. The purification of G17P64K fusion protein was similar to that of P64K. An initial step of purification consisting of 30% saturated ammonium sulfate precipitation was done, Additional fine optimizations included phenyl-sepharose, G200 Sephadex gel filtration and Q-sepharose anion exchanger chromatography. Highly purified protein was obtained and sequenced at the N-terminal amino acid residues. Polypeptide was synthesized by Fmoc solid phase chemical method and cross-linked to carrier protein P64K and DT mutant by MBS method and then the rabbit anti-gastrin 17 antibody was prepared by immunizing rabbit with cross-linked and fused protein. The titer and the activity in vitro of antibody were assessed. RESULTS： G17P64K gene and the recombinant bacteria were obtained. After four steps purification, protein sample that has the purity above 90% was achieved. At the 84^th day after the first immunization, the titer of antibody against cross-linked protein reached 51 200. Evaluation of the antibody in vitro manifested that it had a high inhibitory activity on the growth of tumor cell SW480. CONCLUSION： The P64K-polypeptide cross-linked immunogen immunized rabbit and achieved a higher titer antibody against gastrin 17 than the G17P64K fusion protein immunogen, which could inhibit the growth of the tumor cell SW480.展开更多
Objective:To investigate the correlation of serum P2X7 receptor, CD64 and CD54 expression with infection process in children with bacterial pneumonia.Methods: A total of 164 children with bacterial pneumonia hospitali...Objective:To investigate the correlation of serum P2X7 receptor, CD64 and CD54 expression with infection process in children with bacterial pneumonia.Methods: A total of 164 children with bacterial pneumonia hospitalized in this hospital between June 2016 and February 2018 were selected as bacterial pneumonia group, and 100 healthy children who received vaccination in this hospital during the same period were selected as normal control group. The expression levels of P2X7 receptor, CD64 and CD54 as well as the contents of inflammatory factors, acute phase proteins and immunoglobulins in serum of the two groups were detected. Results: Immediately after admission, serum P2X7 receptor, CD64 and CD54 expression of bacterial pneumonia group were higher than those of normal control group, inflammatory cytokines TNF-α, sTREM-1, IL-2 and IL-6 contents were higher than those of normal control group, acute phase proteins 1-AGP, CRP, CP and HP contents were higher than those of normal control group, and immunoglobulins IgA, IgM and IgG contents were higher than those of normal control group;serum P2X7 receptor, CD64 and CD54 expression in children with bacterial pneumonia were positively correlated with TNF-α, sTREM-1, IL-2, IL-6, 1-AGP, CRP, CP, HP, IgA, IgM and IgG contents.Conclusion:The serum P2X7 receptor, CD64 and CD54 expression increase in children with bacterial pneumonia, and they are positively correlated with the degree of infection.展开更多
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China(grant No.2021D01B112)Tianshan Talent Training Program through the grant 2023TSYCCX0101。
文摘In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We extracted morphological features through image enhancement techniques and calculated the dust activity parameter,Afρ,along with dust mass loss rates and coma color indices using broadband photometric data.Our morphological analysis uncovered a spectrum of dust characteristics among the observed comets,ranging from a significant twisted structure in comet 38P/Stephan-Oterma’s coma to the regular coma envelope surrounding comet 64P/Swift-Gehrels.The Afρvalues varied between 148.8±0.3 cm for 64P/Swift-Gehrels and1118.5±6.2 cm for C/2017 M4(ATLAS)(measured within a reference aperture radius ofρ=6″),indicating a range from moderate to high activity levels.Dust mass loss rates were estimated from 328.1 kg s^(-1)for comet 64P/Swift-Gehrels to 1395.5 kg s^(-1)for comet C/2017 M4(ATLAS).The color indices of comets 38P/Stephan-Oterma and C/2017 M4(ATLAS)closely resemble the average colors of active short-period comets and active longperiod comets,respectively.In contrast,64P/Swift-Gehrels exhibits a significantly bluer hue than typical Jupiter family comets.
基金Supported by Grants from National High Technology Research and Development Program, No.2002AA2Z345B and No.2004AA2Z3803 of the Ministry of Science and Technology of China
文摘AIM： To construct two kinds of anti-gastrin immunogen based on P64K protein from Neisseria rneningitids and to compare their immunogenic effect. METHODS： G17P64K gene was cloned and ligated into pET28a plasmid, then transformed into BL21（DE3）. After inoculation of LB medium and IPTG induction, the recombinant protein was solubly expressed at a high level. The purification of G17P64K fusion protein was similar to that of P64K. An initial step of purification consisting of 30% saturated ammonium sulfate precipitation was done, Additional fine optimizations included phenyl-sepharose, G200 Sephadex gel filtration and Q-sepharose anion exchanger chromatography. Highly purified protein was obtained and sequenced at the N-terminal amino acid residues. Polypeptide was synthesized by Fmoc solid phase chemical method and cross-linked to carrier protein P64K and DT mutant by MBS method and then the rabbit anti-gastrin 17 antibody was prepared by immunizing rabbit with cross-linked and fused protein. The titer and the activity in vitro of antibody were assessed. RESULTS： G17P64K gene and the recombinant bacteria were obtained. After four steps purification, protein sample that has the purity above 90% was achieved. At the 84^th day after the first immunization, the titer of antibody against cross-linked protein reached 51 200. Evaluation of the antibody in vitro manifested that it had a high inhibitory activity on the growth of tumor cell SW480. CONCLUSION： The P64K-polypeptide cross-linked immunogen immunized rabbit and achieved a higher titer antibody against gastrin 17 than the G17P64K fusion protein immunogen, which could inhibit the growth of the tumor cell SW480.
文摘Objective:To investigate the correlation of serum P2X7 receptor, CD64 and CD54 expression with infection process in children with bacterial pneumonia.Methods: A total of 164 children with bacterial pneumonia hospitalized in this hospital between June 2016 and February 2018 were selected as bacterial pneumonia group, and 100 healthy children who received vaccination in this hospital during the same period were selected as normal control group. The expression levels of P2X7 receptor, CD64 and CD54 as well as the contents of inflammatory factors, acute phase proteins and immunoglobulins in serum of the two groups were detected. Results: Immediately after admission, serum P2X7 receptor, CD64 and CD54 expression of bacterial pneumonia group were higher than those of normal control group, inflammatory cytokines TNF-α, sTREM-1, IL-2 and IL-6 contents were higher than those of normal control group, acute phase proteins 1-AGP, CRP, CP and HP contents were higher than those of normal control group, and immunoglobulins IgA, IgM and IgG contents were higher than those of normal control group;serum P2X7 receptor, CD64 and CD54 expression in children with bacterial pneumonia were positively correlated with TNF-α, sTREM-1, IL-2, IL-6, 1-AGP, CRP, CP, HP, IgA, IgM and IgG contents.Conclusion:The serum P2X7 receptor, CD64 and CD54 expression increase in children with bacterial pneumonia, and they are positively correlated with the degree of infection.
