Evaluation of a new handheld point-of-care blood gas analyser using 100 equine blood samples

Objectives

To determine whether the Enterprise point-of-care blood analysis system (EPOC) produces results in agreement with two other blood gas analysers in regular clinical use (i-STAT and Radiometer ABL77) and to investigate the precision of the new machine when used with equine whole blood.

北方杂草稻种子抗冻性的初步研究

以辽宁杂草稻WR04-23和WR04-33为试验材料,以栽培稻秋光为对照,研究了低温对种子萌发、萌发时a-淀粉酶活性和相对电解质渗出率的影响。在25℃条件下浸种12 h后冷冻处理,参试的两个杂草稻的发芽率和成苗率均在50.0%以上,而对照品种秋光的发芽率为0%。在相同处理条件下,杂草稻种子的a-淀粉酶活性远远高于秋光,而相对电解质渗出率则低于秋光。结果表明,杂草稻种子比对照品种对冻害有更强的耐受能力,这可能是其在北方稻区顺利越冬并繁衍的重要因素之一。     

4种针叶树抗汽车尾气污染能力之比较

【研究目的】为了研究园林绿化树种对汽车污染的适应能力,试验以油松、北美乔松、华山松、白皮松4种针叶树的盆栽2年生实生苗为试材;【方法】采用静态熏气法,将苗木用不同浓度（0．0、0．6、1．0、1．6、2．5、3．1、4．1mg／m^3）的标准汽车尾气处理72h,研究了汽车尾气对4种苗木叶片的相对电导率、MDA含量、叶绿素含量、SOD和POD酶活性的影响。【结果】结果表明,随着处理浓度的增加,4种苗木的叶绿素含量和a／b值均呈下降趋势;MDA和相对电导率整体呈上升趋势;SOD和POD活性呈现先上升后下降的趋势。但4树种各指标的变化幅度不同。【结论】利用模糊数学隶属函数值法对4种苗木的抗性进行综合评定．其抗性大小依次为华山松〉北美乔松〉白皮松〉油松。     

Improvement of mechanical and electrical properties of poly(ethylene glycol) and cyanoresin based polymer electrolytes

Ionic conductivity and mechanical properties of a mixed polymer matrix consisting of poly(ethylene glycol) (PEG) and cyanoresin type M (CRM) with various lithium salts and plasticizer were examined. The CRM used was a copolymer of cyanoethyl pullulan and cyanoethyl poly(vinyl alcohol) with a molar ratio of 1:1, mixed plasticizer was ethylene carbonate (EC) and propylene carbonate (PC) at a volume ratio of 1:1. The conductive behavior of polymer electrolytes in the temperature range of 298∼338 K was investigated. The PEG/LiClO₄ complexes exhibited the highest ionic conductivity of ∼10⁻⁵ S/cm at 25°C with the salt concentration of 1.5 M. In addition, the plasticized PEG/LiClO₄ complexes exhibited improvement of ionic conductivity. However, their complexes showed decreased mechanical properties. The improvement of ionic conductivity and mechanical properties could be obtained from the polymer electrolytes by using CRM. The highest ionic conductivity of PEG/CRM/LiClO₄/(EC-PC) was 5.33×10⁻⁴ S/cm at 25°C.     

Blood chemistry and acid-base balance in rainbow trout Oncorhynchus mykiss with experimentally-induced acute bacterial gill disease

Rainbow trout were experimentally infected with the causative agent of bacterial gill disease (BGD) (Flavobacterium branchiophilum) via bath challenge. All fish were cannulated with dorsal aortic catheters, had nasogastric tubes sutured in place for feeding, and were maintained individually, in plexiglass boxes with a flow-through water system. Fish were either fed, or unfed during the trial. Acute changes in blood gas, serum biochemistry and clinical parameters were monitored. By 24h post-challenge, BGD-infected trout that had been fed had significant hypoxemia, hypercapnia, increased blood ammonia, hypoosmolality, hyponatremia, hypochloremia, and increased cough and respiratory rates when compared to control levels. Unfed BGD-infected trout had similar, but less severe blood gas and clinical changes, and no electrolyte disturbances. The BGD-induced hypoxemia is likely exacerbated by increased oxygen demands brought on by feeding. It is not known what association feeding has with the development of low serum ion levels in BGD-infected trout. This is the first study to report the use of fed fish, as opposed to unfed or starved trout, in obtaining blood chemistry values from indisturbed and cannulated animals.     

Effect of inorganic electrolytes on the stability of allophane in aqueous solutions of anionic xanthan polysaccharide

The polymeric (a) weak-stabilization (PWST), (b) floccelation (PFL), and (c) stabilization (PST) of ailophane with the anionic xanthan (GX) polysaccharide (He and Horikawa 1996a, b: Soil Sci. Plant Nutr., 42, 603-612, 637-644) were investigated further with respect to the effect of 1-1, 2-1, and 1-2 electrolytes (MA). At pH 4.5, the PST was (i) high in 0.1 mM NaCl, MgCl₂, ZnCl₂, and PbCl₂ solutions, whereas (ii) considerably low in 100 mM NaCl, 0.1 mM Na₂SO₄ and NaH₂PO₄ solutions, respectively. At pH 6.5 (i.e.p.), the flocculated ailophane showed (i) a very low PWST in 0.01 mM NaCl, MgCl₂, and Na₂SO₄ solutions, and also (ii) a low PST in 0.01 mM MA except for NaH₂PO₄. In 0.01 mM PbCl₂ and NaH₂PO₄ solutions, ailophane was well dispersed, respectively, and marked PFL and PST were observed with further addition of xanthan. The changes and decrease of PWST and PST were discussed in relation to the iocculation of ailophane due to the (a) effect of MA on the diffuse double layer of the particles, (b) specific adsorption of phosphate and lead ions on the surface, and (c) weakening of the repulsive force between anionic GX chains by MA.