The ozonolysis of cyclohexene is an important model system for understanding the more complex reaction of O_3 with monoterpenes; however, many previous studies have come to qualitatively different conclusions about th...The ozonolysis of cyclohexene is an important model system for understanding the more complex reaction of O_3 with monoterpenes; however, many previous studies have come to qualitatively different conclusions about the composition of the secondary organic aerosol(SOA)formed in this system. In the present study, the composition of the SOA produced by cyclohexene ozonolysis in the absence of seed aerosols has been investigated online and off-line using synchrotron-based thermal desorption/tunable vacuum ultraviolet photoionization time-of-flight aerosol mass spectrometry(TD-VUV-TOF-PIAMS) in conjunction with a custom-built smog chamber. On the basis of the molecular ions observed by mass spectrometry at 11.5 e V, it was found that dicarboxylic acids, dialdehydes, and cyclic anhydrides are the predominant low molecular weight components in the particle phase. The results also indicated that TD-VUV-TOF-PIAMS coupled with filter sampling is a potentially useful tool for the investigation of SOA composition both in the field and in the laboratory.展开更多
Objective:To explore the effects of alanine glutamine on inflammatory, immune, antioxidant and nutritional indicators in colon cancer patients.Methods: A total of 126 cases of colon cancer with intestinal obstruction ...Objective:To explore the effects of alanine glutamine on inflammatory, immune, antioxidant and nutritional indicators in colon cancer patients.Methods: A total of 126 cases of colon cancer with intestinal obstruction were divided into control group (n=63) and observation group (n=63) from May 2015 to May 2017 in Zhongnan Hospital of Wuhan University and Gezhouba Dam group central hospital, the control group only received parenteral nutrition, while the observation group was treated with parenteral nutrition plus alanine glutamine treatment. The expression levels of nutritional indicators, inflammatory factors, immunity and antioxidant were compared between the two groups.Results:Before and 1 d after treatment, there was no significant difference between the two groups of prealbumin (PA), albumin (ALB), tumor necrosis factor-α (TNF-α), C reactive protein (CRP), interferon-γ (IFN-γ) and immunoglobulin (IgA, IgG, IgM), superoxide dismutase (SOD) and malondialdehyde (MDA). 1 d after treatment, the levels of PA, ALB, IFN-γ, IgA, IgG, IgM and SOD in two groups were significantly lower than before the treatment, and TNF- , CRP and MDA were significantly higher than before the treatment. On the 7 d after treatment, the levels of PA, ALB, IFN-γ, IgA, IgG, IgM and SOD in two groups were significantly increased compared with the 1 d after treatment, while TNF-α, CRP and MDA were significantly lower than the 1 d after the treatment, the PA, ALB, IFN-γ, IgA, IgG, IgM and SOD levels in the observation group were significantly higher than those in the control group, while TNF-α, CRP and MDA were significantly lower than those of the control group, there was no significant difference in IgA, IgG and IgM levels between the observation group and that before treatment. There was no significant difference in MDA and SOD levels between the control group and that before tre atment.Conclusions: Parenteral nutrition support in patients with colon cancer with intestinal obstruction, alamyl glutamine, can significantly improve the nutritional level, reduce the inflammatory response, enhance the immune and antioxidant functions.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11575178,91544105,U1532137,91544228,and U1232130)
文摘The ozonolysis of cyclohexene is an important model system for understanding the more complex reaction of O_3 with monoterpenes; however, many previous studies have come to qualitatively different conclusions about the composition of the secondary organic aerosol(SOA)formed in this system. In the present study, the composition of the SOA produced by cyclohexene ozonolysis in the absence of seed aerosols has been investigated online and off-line using synchrotron-based thermal desorption/tunable vacuum ultraviolet photoionization time-of-flight aerosol mass spectrometry(TD-VUV-TOF-PIAMS) in conjunction with a custom-built smog chamber. On the basis of the molecular ions observed by mass spectrometry at 11.5 e V, it was found that dicarboxylic acids, dialdehydes, and cyclic anhydrides are the predominant low molecular weight components in the particle phase. The results also indicated that TD-VUV-TOF-PIAMS coupled with filter sampling is a potentially useful tool for the investigation of SOA composition both in the field and in the laboratory.
文摘Objective:To explore the effects of alanine glutamine on inflammatory, immune, antioxidant and nutritional indicators in colon cancer patients.Methods: A total of 126 cases of colon cancer with intestinal obstruction were divided into control group (n=63) and observation group (n=63) from May 2015 to May 2017 in Zhongnan Hospital of Wuhan University and Gezhouba Dam group central hospital, the control group only received parenteral nutrition, while the observation group was treated with parenteral nutrition plus alanine glutamine treatment. The expression levels of nutritional indicators, inflammatory factors, immunity and antioxidant were compared between the two groups.Results:Before and 1 d after treatment, there was no significant difference between the two groups of prealbumin (PA), albumin (ALB), tumor necrosis factor-α (TNF-α), C reactive protein (CRP), interferon-γ (IFN-γ) and immunoglobulin (IgA, IgG, IgM), superoxide dismutase (SOD) and malondialdehyde (MDA). 1 d after treatment, the levels of PA, ALB, IFN-γ, IgA, IgG, IgM and SOD in two groups were significantly lower than before the treatment, and TNF- , CRP and MDA were significantly higher than before the treatment. On the 7 d after treatment, the levels of PA, ALB, IFN-γ, IgA, IgG, IgM and SOD in two groups were significantly increased compared with the 1 d after treatment, while TNF-α, CRP and MDA were significantly lower than the 1 d after the treatment, the PA, ALB, IFN-γ, IgA, IgG, IgM and SOD levels in the observation group were significantly higher than those in the control group, while TNF-α, CRP and MDA were significantly lower than those of the control group, there was no significant difference in IgA, IgG and IgM levels between the observation group and that before treatment. There was no significant difference in MDA and SOD levels between the control group and that before tre atment.Conclusions: Parenteral nutrition support in patients with colon cancer with intestinal obstruction, alamyl glutamine, can significantly improve the nutritional level, reduce the inflammatory response, enhance the immune and antioxidant functions.
