氢化物原子荧光光度法测定食品中砷的不确定度评定

目的探讨氢化物原子荧光光度法测定食品中砷的不确定度评定方式。方法依据JJF1059-1999建立数学模型,合成不确定度。结果当食品中砷含量为0.22mg/kg时,合成不确定度为0.008mg/kg,扩展不确定度为0.02mg/kg。结论本评定过程清晰合理,主要影响因素不遗漏、不重复,适用于原子荧光光度法的不确定度评定。     

Some notes on uncertainty; Federal policy and innovation

The legislative background and current responsibilities of the new National Center for Health Care Technology (NCHCT) are discussed. The NCHCT's charge is to consider the stage of development, the actual or potential risks, costs and rate of use of health care technology. The role of Government in supporting new technologies, stimulating innovation and encouraging application of research products is considered. These issues are discussed in the context of the uncertainty inherent in planning and the formulation of public policy.     

Human variability in susceptibility How big, how often, for what responses to what agents?

This paper first reviews in plain language some basic concepts and methods for estimating inter-individual variability in susceptibility from human data. A scale is offered to allow different variability findings to be understood and compared. Then the accumulated results of different variability analyses, information on how much variability has been observed and how often, is summarized in the form of a series of box plots. Data are presented on pharmacodynamic variability for various non-cancer effects, variability in susceptibility to infectious organisms, and variability in susceptibility to carcinogenesis by genetically-acting agents.     

栀子药材中三种有效成分HPLC定量分析结果不确定度的评定

采用HPLC方法同时测定栀子药材中栀子苷、绿原酸和藏红花素Ⅰ的含量,通过对测试方法流程进行分析,确定不确定度来源,结合含量测定方法验证数据,计算了不确定度分量、合成不确定度及扩展不确定度;结果表明,用HPLC方法定量分析栀子药材中栀子苷、绿原酸和藏红花素1的方法满足现代药物分析方法学的要求,且三者的扩展不确定度分别为0.1024,0.2254,0.1265.     

质控金黄色葡萄球菌计数结果不确定度评定

目的:评定质控金黄色葡萄球菌计数检测的不确定度,减少检测结果误差。方法:依据GB4789.10-2010,分析质控金黄色葡萄球菌计数结果的不确定度来源,并对检验结果取对数后评定其不确定度。结果:质控金黄色葡萄球菌含量为1.6×104～2.8×104 CFU/ml。本次实验的重复性限为1.27,复现性限为1.34。结论:不确定度的分析能有效掌握检测结果的可信程度和准确性。本次实验不确定度评定方法,也适合检测样品金黄色葡萄球菌计数结果的不确定度评定。     

Diagnostic uncertainty and recall bias in chronic low back pain

Patients’ beliefs about the origin of their pain and their cognitive processing of pain-related information have both been shown to be associated with poorer prognosis in low back pain (LBP), but the relationship between specific beliefs and specific cognitive processes is not known. The aim of this study was to examine the relationship between diagnostic uncertainty and recall bias in 2 groups of chronic LBP patients, those who were certain about their diagnosis and those who believed that their pain was due to an undiagnosed problem. Patients (N = 68) endorsed and subsequently recalled pain, illness, depression, and neutral stimuli. They also provided measures of pain, diagnostic status, mood, and disability. Both groups exhibited a recall bias for pain stimuli, but only the group with diagnostic uncertainty also displayed a recall bias for illness-related stimuli. This bias remained after controlling for depression and disability. Sensitivity analyses using grouping by diagnosis/explanation received supported these findings. Higher levels of depression and disability were found in the group with diagnostic uncertainty, but levels of pain intensity did not differ between the groups. Although the methodology does not provide information on causality, the results provide evidence for a relationship between diagnostic uncertainty and recall bias for negative health-related stimuli in chronic LBP patients.     

Study of the migration phenomena of specific metals in canned tomato paste before and after opening. Validation of a new quality indicator for opened cans

A method for the simultaneous determination of Cd–Pb, As–Cu, Cr–Ni and Fe–Mn in canned tomato paste samples by Electrothermal Atomic Absorption Spectrometry was developed and validated. The validation procedure was conducted according to the terms of the European regulation for the official control of contaminants in foods. The validated method was applied for the determination of these metals and metalloids in 13 different tomato paste samples and the results showed that Cd content was higher than the maximum permissible value of 0.050 mg kg⁻¹ as proposed in European Regulation (EC) No 1881/2006 concerning fresh fruits and vegetables. Furthermore, a new quality indicator was evaluated in order to provide information about tomato paste quality and the appropriate storage time of an opened canned tomato paste. Finally, a migration test was accomplished based on the calculation of mass balance and the comparison of the elemental content in canned tomato paste samples and in aseptic paper pack and it was proved that Fe and Pb were the main metals migrating in tomato paste samples.     

采用压差传感器测量医用气体流量的不确定度评定

目的：对采用压差法测量医用气体流量的测量原理、结构和工艺等因素引入的不确定度进行分析.方法：利用液体流经节流装置时所产生的压差测量气体流量.结果：合成不确定度μc=1.364％,满足产品设计要求.结论：压差传感器测量方法准确可靠,能够满足对医用气体流量测量的要求.     

Associations of Uncertainty With Psychological Health and Quality of Life in Older Adults With Advanced Cancer

ContextOlder adults with advanced cancer face uncertainty related to their disease and treatment.ObjectivesTo evaluate the associations of uncertainty with psychological health and quality of life (QoL) in older adults with advanced cancer.MethodsSecondary cross-sectional analysis of baseline data from a national clustered geriatric assessment trial. Patients 70 years and older with advanced cancer considering a new line of chemotherapy were recruited. We measured uncertainty using the modified nine-item Mishel Uncertainty in Illness Scale. Dependent variables included anxiety (Generalized Anxiety Disorder-7), depression (Generalized Depression Scale-15), distress (distress thermometer), QoL (Functional Assessment of Cancer Therapy—General), and emotional well-being (Functional Assessment of Cancer Therapy—General subscale). We used multivariate linear regression analyses to evaluate the association of uncertainty with each dependent variable. We conducted a partial least squares analysis with a variable importance in projection (VIP) plot to assess the contribution of individual variables to the model. Variables with a VIP <0.8 were considered less influential.ResultsWe included 527 patients (median age 76 years; range 70–96). In multivariate analyses, higher levels of uncertainty were significantly associated with greater anxiety (β = 0.11; SE = 0.04), depression (β = 0.09; SE = 0.02), distress (β = 0.12; SE = 0.02), as well as lower QoL (β = ?1.08; SE = 0.11) and emotional well-being (β = ?0.29; SE = 0.03); the effect sizes were considered small. Uncertainty items related to disease and treatment were most strongly associated with psychological health and QoL scores (all VIP >0.8).ConclusionUncertainty among older patients with advanced cancer is associated with worse psychological health and QoL. Tailored uncertainty management strategies are warranted.