Ultrasound technology for better beef price

Sluggish growth in per capita consumption and a downward pressure on beef price at the farm level has required producers to raise cattle that precisely target the meat attributes desired by consumers. Coupled with the consumers' preference for beef with lean tissue and less external fat, the beef packing plants have used the dualistic grading system that emphasizes leanness and palatability; both important to carcass prices. Ultrasound technology can help farmers to produce a carcass with an optimal mix of attributes such as marbling and muscling, and external fat. The results of this study show a high level of accuracy of ultrasound technology in predicting carcass attributes. An estimated hedonic regression model shows that the carcass attributes are reflected on the implicit beef price. Ultrasound technology helps producers to produce carcass with the desired attributes and thus obtain a higher price.     

彩色多普勒超声与磁共振成像在原发性肝外胆管癌患者诊断中的价值差异

目的：探讨彩色多普勒超声与磁共振成像（MRI）在原发性肝外胆管癌患者诊断中的应用价值。方法回顾性分析120例原发性肝外胆管癌患者彩色多普勒超声和MRI资料,比较两种检查方法诊断的阳性率、误诊率、漏诊率及梗阻部位准确率。结果两种检查方法对肝外胆管癌诊断的阳性率、误诊率及梗阻部位准确率差异无统计学意义（P＞0.05）;但彩色多普勒超声检查漏诊率明显高于MRI（P＜0.05）。结论彩色多普勒超声可作为肝外胆管癌首选影像学筛查方法,但对于临床高度怀疑肝外胆管癌、而彩色多普勒超声未检出者应加行 MRI,以提高诊断的准确性。     

Low-intensity pulsed ultrasound (LIPUS) can decrease the economic burden of fracture non-union

Abstract

Objectives:

Few studies have evaluated the economic burden of surgical and conservative treatment of fracture non-union. An analysis was undertaken of aggregated payer data to determine economic costs of non-unions treated with surgery only vs non-unions treated conservatively with low-intensity pulsed ultrasound (LIPUS) only.     

HIFU-2001型高强度聚焦超声刀使用经验报告

HIFU-2001型高强度聚焦超声刀是我国自行研发的新的肿瘤治疗系统,本文对在长年实际操作过程中总结的经验进行了交流报告。     

响应面法优化超声波辅助提取冬虫夏草多糖工艺研究

为采用响应面优化法对超声波辅助提取冬虫夏草多糖的工艺参数进行优化,设计单因素实验,确定影响提取率的几个因素的大概范围,即超声波提取功率、提取温度、提取时间、提取料液比。然后设计响应面实验对工艺参数进行优化,通过查阅文献,选定蒽酮-硫酸法测定冬虫夏草多糖含量,在490 nm的波长下测定吸光值,算出多糖含量,以此作为响应面设计的响应值。结果表明,超声波辅助提取冬虫夏草多糖工艺参数为超声波功率为300 W,提取时间为30 min,提取温度为45℃,料液比为1/50。在此参数下冬虫夏草多糖提取率最大。