Objective：To validate malnutrition screening tool of nutrition risk index （NRI） against patent-generated subjective global assessment （PG-SGA） as a gold standard tool in colorectal cancer patients before radiothe...Objective：To validate malnutrition screening tool of nutrition risk index （NRI） against patent-generated subjective global assessment （PG-SGA） as a gold standard tool in colorectal cancer patients before radiotherapy.Methods：Nutritional status of 52 volunteer colorectal cancer patients with a mean age of 54.1±16.8 years who referred to radiotherapy center were assessed by PG-SGA （gold standard method） and NRI.Serum albumin levels of patients were determined by colorimetric method.A contingency table was used to determine the sensitivity,specificity,and predictive value of the NRI in screening patients at risk of malnutrition,in comparison with the PG-SGA in patients before radiotherapy.Results：The findings of PG-SGA and NRI showed that 52％ and 45％ of patients in our study were moderately or severely malnourished respectively.The NRI had a sensitivity of 66％ and a specificity of 60％ against PG-SGA.The positive predictive value was 64％ and the negative predicative value was 62％.The agreement between NRI and PG-SGA was statistically insignificant （kappa =0.267; P＞0.05）.Conclusions：The findings of present study showed that the prevalence of malnutrition was high in patients with colorectal cancer.Moreover,NRI method had low sensitivity and specificity in assessing nutritional status of patients with cancer.It seems that the combination of anthropometric,laboratory parameters and a subjective scoring system may be helpful tools in screening of malnutrition in cancer patients.展开更多
目的:研究补阳还五汤抗全脑缺血后再灌注损伤的分子机制。方法 :将66只SD大鼠随机分为3组,即正常组、模型组和药物组(补阳还五汤预干预),模型组和药物组再分别设置2、24 h 2个观察时间点。连续给药5 d后,采用改良的Pulsinelli四血管闭...目的:研究补阳还五汤抗全脑缺血后再灌注损伤的分子机制。方法 :将66只SD大鼠随机分为3组,即正常组、模型组和药物组(补阳还五汤预干预),模型组和药物组再分别设置2、24 h 2个观察时间点。连续给药5 d后,采用改良的Pulsinelli四血管闭塞法复制全脑缺血大鼠模型,再灌后2、24 h采用免疫组化法检测各组大鼠皮质神经细胞NMDA受体(N-methyl-D-aspartic acid receptor)亚单位NR1的表达水平。结果 :与正常组比较,模型组2、24 h 2个不同时间点,NR1的表达水平显著升高(P<0.05);与模型组比较,药物组再灌注后2、24 h 2个不同时间点,NR1表达水平显著降低(P<0.01)。结论 :补阳还五汤预干预对全脑缺血再灌注模型大鼠大脑皮层神经元NR1表达水平的增高有调低作用。展开更多
Transmission and negative refractive index （NRI） of metal-dielectric-metal （MDM） sandwiched metamaterial perfo- rated with four kinds of shapes of holes are numerically studied. Results indicate that positions of ...Transmission and negative refractive index （NRI） of metal-dielectric-metal （MDM） sandwiched metamaterial perfo- rated with four kinds of shapes of holes are numerically studied. Results indicate that positions of all transmission peaks of these kinds of holes are sensitive to the shape of the hole. Under the same conditions, the circular hole can obtain the maximum NRI and the rectangular hole can obtain the maximum frequency bandwidth of NRI. Moreover, the figure of merit （FOM） of the circular hole is the maximum too. As a result, we can obtain a higher NRI and FOM metamaterial by drilling circular hole arrays on MDM metamaterial.展开更多
A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave freque...A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave frequency range. The effective media parameters were retrieved from the numerical and experimental results, which clearly show that there exists a very wide frequency band where the permittivity and permeability are negative. The influence of the structure parameters on the magnetic response and the cut-off frequency of the negative permittivity are studied in detail. This metamaterial would have potential application in designing broadband microwave devices.展开更多
基金the financial support of Nutrition Research Center,Tabriz University of Medical Sciences
文摘Objective：To validate malnutrition screening tool of nutrition risk index （NRI） against patent-generated subjective global assessment （PG-SGA） as a gold standard tool in colorectal cancer patients before radiotherapy.Methods：Nutritional status of 52 volunteer colorectal cancer patients with a mean age of 54.1±16.8 years who referred to radiotherapy center were assessed by PG-SGA （gold standard method） and NRI.Serum albumin levels of patients were determined by colorimetric method.A contingency table was used to determine the sensitivity,specificity,and predictive value of the NRI in screening patients at risk of malnutrition,in comparison with the PG-SGA in patients before radiotherapy.Results：The findings of PG-SGA and NRI showed that 52％ and 45％ of patients in our study were moderately or severely malnourished respectively.The NRI had a sensitivity of 66％ and a specificity of 60％ against PG-SGA.The positive predictive value was 64％ and the negative predicative value was 62％.The agreement between NRI and PG-SGA was statistically insignificant （kappa =0.267; P＞0.05）.Conclusions：The findings of present study showed that the prevalence of malnutrition was high in patients with colorectal cancer.Moreover,NRI method had low sensitivity and specificity in assessing nutritional status of patients with cancer.It seems that the combination of anthropometric,laboratory parameters and a subjective scoring system may be helpful tools in screening of malnutrition in cancer patients.
文摘目的:研究补阳还五汤抗全脑缺血后再灌注损伤的分子机制。方法 :将66只SD大鼠随机分为3组,即正常组、模型组和药物组(补阳还五汤预干预),模型组和药物组再分别设置2、24 h 2个观察时间点。连续给药5 d后,采用改良的Pulsinelli四血管闭塞法复制全脑缺血大鼠模型,再灌后2、24 h采用免疫组化法检测各组大鼠皮质神经细胞NMDA受体(N-methyl-D-aspartic acid receptor)亚单位NR1的表达水平。结果 :与正常组比较,模型组2、24 h 2个不同时间点,NR1的表达水平显著升高(P<0.05);与模型组比较,药物组再灌注后2、24 h 2个不同时间点,NR1表达水平显著降低(P<0.01)。结论 :补阳还五汤预干预对全脑缺血再灌注模型大鼠大脑皮层神经元NR1表达水平的增高有调低作用。
基金Project supported partially by the National Natural Science Foundation of China (Grant No.60778041)the Natural Science Foundation of the Jiangsu Higher Education Institutions,China (Grant No.07KJA51001)
文摘Transmission and negative refractive index （NRI） of metal-dielectric-metal （MDM） sandwiched metamaterial perfo- rated with four kinds of shapes of holes are numerically studied. Results indicate that positions of all transmission peaks of these kinds of holes are sensitive to the shape of the hole. Under the same conditions, the circular hole can obtain the maximum NRI and the rectangular hole can obtain the maximum frequency bandwidth of NRI. Moreover, the figure of merit （FOM） of the circular hole is the maximum too. As a result, we can obtain a higher NRI and FOM metamaterial by drilling circular hole arrays on MDM metamaterial.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61172115 and 60872029)the High-Tech Research and Development Program of China (Grant No. 2008AA01Z206)+1 种基金the Aeronautics Foundation of China (Grant No. 20100180003)the Fundamental Research Funds for the Central Universities of China (Grant No. ZYGX 2009J037)
文摘A low absorptivity broadband negative refractive index metamaterial with a multi-gap split-ring and metallic cross （MSMC） structure is proposed and investigated numerically and experimentally in the microwave frequency range. The effective media parameters were retrieved from the numerical and experimental results, which clearly show that there exists a very wide frequency band where the permittivity and permeability are negative. The influence of the structure parameters on the magnetic response and the cut-off frequency of the negative permittivity are studied in detail. This metamaterial would have potential application in designing broadband microwave devices.
