天然生物活性陶瓷珍珠层在骨组织修复中的应用

珍珠层是一种天然的纳米生物陶瓷材料，一直是生物矿物材料学者研究的焦点。本文根据国外文献有关利用珍珠层作为骨植入材料的研究报道，就珍珠层的生物相容性和可降解性，及其所具有的骨诱导和骨传导作用的动物临床实验结果，进行了综合分析和论述。认为珍珠层是一种很有前途的骨植入材料，提出了今后研究的方向。     

骨巨细胞瘤影像学特征及误诊分析

目的:研究骨巨细胞瘤(GCT)的X线平片、CT、MRI影像学表现,分析误诊的原因,提高诊断准确性。方法:搜集30例手术病理证实的GCT病例,回顾性分析其术前X线平片、CT平扫、MRI影像学表现。结果:GCT发生于股骨远端13例,胫骨近端6例,股骨近段4例,肱骨近端3例,桡骨远端2例,腰椎1例,髂骨1例。术前误诊5例,约占16.7%。结论:X线平片、CT和MRI从不同角度反映GCT的病理特征,合理结合三种检查方法,能更全面显示GCT的影像学特征,有利于诊断及鉴别诊断。      

D290树脂从石煤酸浸液中吸附钒的工艺

本文主要研究Ｄ２９０树脂从石煤酸浸液中回收钡的工程过程,并在树脂选型、树脂上柱条件,洗脱液的组成等方面进行了详细实验,采用酸浸－离子交换新工艺后,可在减化流程,降低消耗的同时使回收率提高１５％以上。     

A study on the meat and bone meal and poultry by-product meal as protein substitutes of fish meal in practical diets for Litopenaeus vannamei juveniles

A study was conducted to evaluate the effects of meat and bone meal (MBM) and poultry by-product meal (PBM) as the replacement of fish meal in the diets on the growth performance, survival and apparent digestibility coefficients (ADC) of Litopenaeus vannamei. The basal diets were formulated with 22% fish meal and other ingredients which provided about 40% protein and 9% lipid in the diet. The experimental diets included MBM or PBM to replace 0, 20%, 40%, 60% and 80% of total fish meal respectively. All diets were iso-nitrogenous and isocaloric in gross terms. The results showed that there were no significant differences (Pτ;0.05) in growth performance and ADC among the treatments fed with the diets in which 0–60% fish meal had been replaced with MBM, while the percent weight gain (WG, %), body length gain (BLG, %) and ADC significantly decreased when the MBM was up to 80% of the fish meal. There were no significant differences (Pτ;0.05) in growth performance and ADC among all the treatments fed with the diets in which 0–80% fish meal had been replaced with PBM.     

Electron spin resonance dating of Quaternary bone material from Tasmanian caves—A comparison with ages determined by aspartic acid racemization and C14

Abstract

Fourteen bone samples are analysed to test the usefulness of equivalent dose (ED) determinations by electron spin resonance (ESR) as a rapid method of determining relative age and making an estimate of absolute age. ED values are compared with eight aspartic acid dates and two C¹⁴ dates. The latter are dates on charcoal found in close association with bone at archaeological sites. For samples less than 25 000 years old an excellent correlation is obtained when ED values are compared with dates obtained by the other two methods. The relationship suggests that ED values can be converted to estimates of bone age by assuming a mean annual dose rate of 0.1 rad/yr. Age determinations provide little evidence to support earlier suggestions that elements of the Late Pleistocene megafauna survived until the end of the Pleistocene. Bone material at some sites in the‐Florentine Valley and near Montagu appears to be much older than had previously been believed. Only one site (Main Cave, Montagu) containing megafaunal elements appears to be terminal Pleistocene in age but the possibility of reworking of megafauna material from nearby older sites cannot be excluded. ESR dating has considerable potential as an exploratory dating tool but can only be applied to dense, unaltered bone samples. Attempts to analyse five samples from Kutikina Cave in Western Tasmania were unsuccessful because of post‐depositional contamination of the bone.     

骨巨细胞瘤的CT、MRI诊断

目的文中分析了X线平片、CT及MRI征象并与手术病理对照,总结骨巨细胞瘤的CT、MRI表现及其特点.材料与方法收集经病理或活检证实的16例骨巨细胞瘤.结果显示CT、MRI可以提供比X线平片更全面的影像学信息.结论综合运用以上检查方法将大大提高骨巨细胞瘤诊断的准确性,并且能够为临床提供更全面的影像学信息.     

原发于骨上皮样血管内皮瘤的影像对比分析

目的:提高对骨上皮样血管内皮瘤(EHE)的认识和影像诊断水平。方法:回顾性分析经手术病理证实的6例骨上皮样血管内皮瘤的X线平片、CT、MR和临床病理,结合文献对比分析各检查方法的影像特征。结果:3个病例表现为多发病灶,分别位于股骨下段、胫腓骨及足部;2个病例病灶位于胫骨下段;1例病灶位于股骨近端。X线平片及CT平扫示多灶性溶骨性骨破坏、硬化边,部分病灶内见“栅栏样”骨嵴,MR上病灶呈稍长T1、长T2信号,增强后呈明显强化。免疫组化提示肿瘤细胞表达血管内皮细胞标记如CD3l、CD34、Vimentin、CK呈阳性。结论:骨上皮样血管内皮瘤有一定的影像学特征,X线平片、CT和MR检查能为临床诊断及鉴别诊断提供有价值的信息。      

中国的伤齿龙类恐龙化石

伤齿龙类是手盗龙类中较为独特的一支, 时代从中侏罗世到晚白垩世, 主要分布于亚洲(东部和中部)以及北美地区。本文基于前人的研究成果, 结合新标本, 对中国伤齿龙类的系统分类、骨骼形态、骨组织、系统发育关系和古生物地理等方面进行了全面深入的评估与探讨。     

大黄鱼养殖群体和野生群体骨骼micro CT扫描显微结构比较

为了了解大黄鱼(Larimichthys crocea)野生群体和养殖群体脊椎骨骨骼显微结构的差异,本研究运用了Micro CT技术对大黄鱼全鱼骨骼系统进行了扫描与三维重建,选取野生群体和养殖群体背部和尾部脊椎骨进行了显微结构参数差异分析。结果显示,大黄鱼脊椎骨与头骨、尾骨相连,脊椎骨26个,肋骨附着在第1~11腹椎,无肌间刺,胸鳍位于头骨后,背鳍、腹鳍、臀鳍和尾鳍与脊椎骨并不相连。大黄鱼野生群体背部和尾部脊椎骨的组织矿物质密度和骨矿物质密度均显著高于养殖群体(P0.01),骨体积分数较养殖群体大(P0.05),骨小梁间隔较养殖群体小(P0.05),骨小梁数量、骨小梁厚度和结构模型指数上没有差别。推测是由于野生群体和养殖群体食物组成、生活环境以及活动情况等差异造成的。