市售散装茶油品质比较及食品安全分析

本文以12批次市售散装茶油为研究材料,分别对其酸价、过氧化值、黄曲霉毒素B1和苯并[a]芘4个指标进行测定,分析其食用安全性.结果显示,12批次样品的酸价范围为0.63～5.40 mg·g-1,过氧化值范围为0.036～0.660 g/100 g,黄曲霉毒素B1含量为未检出～5.19μg·kg-1,苯并[a]芘含量为1...     

芪柏塌渍治疗小儿静脉炎的疗效及对TLR-4/核因子-κB信号通路的影响

目的观察芪柏塌渍对静脉炎的疗效,同时探讨其对TLR-4/核因子-κB信号通路上标志蛋白表达的影响。方法选取2018年1月至2019年6月大连市中心医院收治的40例静脉炎患儿作为研究对象,按随机数字表法分为常规组和试验组,各20例,另取20例健康儿童为对照组。对照组患儿取50%硫酸镁溶液浸湿的无菌纱布敷于发生静脉炎处,面积以超过静脉炎范围1~2 cm为宜,并用保鲜膜包裹于纱布外,每2小时换药1次,3 d为一个治疗周期。试验组用无菌棉签蘸取适量芪柏塌渍膏涂于发生静脉炎处,面积以大于静脉炎范围1~2 cm为宜,厚度0.2~0.5 cm,予以无菌纱布覆盖,最后用胶布固定,每4~6小时换药1次,3 d为一个治疗周期。于治疗前及治疗2个周期时,采用蛋白免疫印迹法检测外周血中TLR-4和核因子-κB水平变化,酶联免疫吸附试验(ELISA)检测患儿血清肿瘤坏死因子-α(TNF-α)、白细胞介素-11(IL-11)、白细胞介素-4(IL-4)、白细胞介素-33(IL-33)蛋白表达。结果治疗后两组患儿数字评分法(NRS)评分、红肿面积有所改善,且试验组改善程度优于常规组,差异有统计学意义(P<0.05);静脉炎患儿血清TLR-4、核因子-κB、TNF-α、IL-11、IL-4、IL-33水平明显高于健康对照组(P<0.05);治疗后,常规组和试验组患儿TLR-4、核因子-κB、TNF-α、IL-11、IL-4、IL-33水平明显下降(P<0.05),且试验组上述指标明显低于常规组(P<0.05)。结论静脉炎患儿存在TLR-4/核因子-κB信号通路表达紊乱,芪柏塌渍可明显调节TLR-4/核因子-κB信号通路上标志性蛋白的表达,该效应可能是芪柏塌渍从机体炎症方面改善静脉炎患儿的作用机制之一。     

黑龙江省产三岛柴胡Bupleurum falcatum的生物学性状

描述了黑龙江省产柴胡属植物Bupleurumfalcatum的生物学性状,并从解剖学和生态学角度对该类群与近缘种进行了比较。     

我国A、B股市场的趋同性分析

目前,我国A、B股市场还存有一定程度的分割,完全整合尚待时日.而从时序演进的角度看,尤其是在反映股票价值的市盈率、价格、风险状况的重要指标上,A、B股市场整体上有进一步趋同的趋势.随着A股市场对内、外资企业一视同仁地开放,B股市场存在的实际意义也将逐渐减弱.合并不会对A股市场造成太大冲击.     

浅析我国B2C市场竞争策略

据易观国际发布的数据显示,2008年中国B2C市场销售规模达81亿.B2C平台已经日益成为一条重要的销售渠道,与传统的渠道相比具有价格低,购物方便等优势.研究如何使用B2C平台,打造立体化销售渠道,对提升企业生存能力和盈利能力具有重要的现实意义.本文首先分析了中国B2C市场的现状和发展趋势,然后提出我国B2C市场竞争策略.     

高职院校办公自动化系统的设计与实现

对目前高职院校的实际情况进行分析,并在用户需求分析的基础上进行了研究,提出高职院校办公自动化建设的需求分析与建议,并阐述系统的结构设计和模块设计,给出结合高职院校实际和技术的办公自动化系统安全机制。     

Nonparametric Estimation of Oligopsony Power in First‐Price Auction

This paper proposes a nonparametric procedure to estimate market power for first‐price auction data and applies the procedure to cattle procurement markets. Most previous studies have used parametric methods, which require specific functional forms for retail demand, input supply and processors’ cost equations. However, researchers often find that market power estimates from parametric methods are sensitive to the choice of functional forms and specifications. An application to data from cattle procurement experiments shows that our nonparametric approach greatly outperforms commonly used parametric methods in estimating the degree of market power. While parametric estimates are sensitive to functional form specification and are at least 90% smaller than ‘true’ market power indices, estimates from our nonparametric procedure deviate from the actual value by no more than 25%.     

EU Policies on Bioenergy and their Potential Clash with the WTO

The paper outlines EU policy on bioenergy, including biofuels, in the context of its policy initiatives to promote renewable energy to combat greenhouse gas emissions and climate change. The EU’s Member States are responsible for implementing EU policy: thus, the UK’s Renewables Obligation on electricity suppliers and its Renewable Transport Fuel Obligation and road‐fuel tax rebates are examined. It is unlikely that EU policy is in conflict with the WTO Agreement on Agriculture or that on Subsidies and Countervailing Measures, but its provisions on environmental sustainability criteria could be problematic.     

Did the Federal Crop Insurance Reform Act Alter Farm Enterprise Diversification?

We estimate how much United States farms changed enterprise diversification in response to a marked increase in crop insurance coverage brought about by the 1994 Federal Crop Insurance Reform Act, which substantially increased insurance subsidies. The analysis exploits farm‐level panel census data to compare farm‐specific changes in enterprise diversification over time. By examining diversification decisions of the same farms over time, we control for time‐invariant unobserved individual heterogeneity. We then use pooled cross‐sectional data from the United States Department of Agriculture (USDA) Agricultural Resource Management Survey to estimate the relationship between farm diversification and average returns. We find that the insurance subsidies caused a modest increase in enterprise specialisation and production efficiency. Estimated efficiency gains are far less than the subsidies.     

But are they Meritorious? Genetic Productivity Gains under Plant Intellectual Property Rights

The objective of this paper is to evaluate the effect of Plant Variety Protection (PVP) on the productive merit/yield increases of US seed varieties. As an example, we use wheat varieties, which are and have been available as both protected and unprotected under PVP from both the public and private sectors. We find evidence that PVP has contributed to the genetic improvement of wheat, using varietal trial data from Washington State. As the private open‐pollinated varieties exist only because of PVP and are higher yielding, these results indicate a clear public benefit from PVP.