木聚糖酶对鲫鱼生长性能和小肠绒毛的影响

采用单因子浓度梯度法,在以小麦为主的基础饲料中分别添加0.05%、0.10%和0.15%的木聚糖酶,以基础饲料为对照组,每组设4个重复,饲喂鲫鱼74d,测定鲫鱼的生长性能,观察肠道形态。结果表明:(1)0.05%组鲫鱼的增重率比对照组提高24.2%(P<0.01),0.10%组和0.15%组的增重率比对照组提高17.0%和15.7%(P<0.05);投饲系数分别较对照组降低19.2%、14.4%、13.6%(P<0.05)(。2)0.05%、0.10%和0.15%组的干物质表观消化率分别比对照组提高13.19%、9.33%和8.93%(P<0.01);蛋白质表观消化率分别比对照组提高9.98%、9.19%和8.82%(P<0.01);总糖表观消化率分别比对照组提高29.88%、26.67%和24.94%(P<0.01);(3)饲料添加木聚糖酶能促进小肠绒毛的发育。其中0.05%、0.10%和0.15%组前肠绒毛的高度分别较对照组提高了54.07%、34.96%和18.07(%P<0.01);0.05%组前肠绒毛的宽度较对照组提高了23.46%(P<0.01)。0.05%和0.10%组中肠绒毛的高度分别较对照组提高了6.60%(P<0.01)和3.96%(P<0.05)。0.05%和0.10%组中肠绒毛的宽度分别较对照组提高了10.95%和9.49%(P<0.01)。扫描电镜观察鲫鱼肠绒毛的超微结构,0.05%组前肠绒毛发育最好,绒毛排列整齐,微绒毛簇状结构致密,且很少黏附食糜颗粒。     

A MODEL FOR THE“MAXIMUM CAPACITY” OF ROOMS OR OF SPACE

A discrete optimum mathematical model to derive the "maximum capacity" of people in a roomor in a space used for public gatherings is developed. There are two outcomes in the model. One isfocused on whether the person farthest from exits can escape from the room. The other concentrateson the evacuation time of all the people in the room. According to the results of the two outcomes, amore reasonable "maximum capacity" can be worked out in a simple way.     

葡萄糖在吡虫啉水溶液中的表观摩尔体积

通过测定２９８．１５Ｋ和３０８．１５Ｋ时葡萄糖＋吡虫啉水溶液的密度,求取了葡萄糖的无限稀释表观摩尔体积（ΦＡ０）和分子对相互作用的体积参数（ＶＡＡ）,讨论了葡萄糖一吡虫啉的相互作用对ΦＡ０和ＶＡＡ的影响．     

区间[0,+∞)上有界函数的最大值与最小值定理

在本文,我们给出了区问[O,+∞)上有界函数f(x)的最大值与最小值定理,其中:inf{f(=)1=∈[O,+∞)}相似文献   

滇中昆阳群古地磁研究

对昆阳群中采集的２８３块样品用热退磁法做了磁清洗处理,经精度检验,进行了统计分析．根据获得的古地磁结果,探讨了昆阳群地层所代表的古地磁极性和古纬度,建立了该地区中、晚元古界古地磁视极移路径,并与华北地块及扬子地块该时期的视极移路径进行了对比,讨论了其构造运动及相互之间的关系,认为下昆阳亚群与长城系古纬度相近,古地磁极性及视极移路径可比,时代相当．     

Latent class DEDICOM

A probabilistic DEDICOM model was proposed for mobility tables. The model attempts to explain observed transition probabilities by a latent mobility table and a set of transition probabilities from latent classes to observed classes. The model captures asymmetry in observed mobility tables by asymmetric latent mobility tables. It may be viewed as a special case of both the latent class model and DEDICOM with special constraints. A maximum penalized likelihood (MPL) method was developed for parameter estimation. The EM algorithm was adapted for the MPL estimation. Two examples were given to illustrate the proposed method. The work reported in this paper has been supported by grant A6394 to the first author from the Natural Sciences and Engineering Research Council of Canada and by a fellowship of the Royal Netherlands Academy of Arts and Sciences to the second author. We would like to thank anonymous reviewers for their insightful comments.     

某新型药茶对冠心病血液流变学参数影响的实验研究

探讨了一种新型药茶对冠心病患者血液流变学参数的影响。通过冠心病患者服用药茶前后的各项血液流变学参数，血浆纤维蛋白原浓度和其它临床指标的对比，说明该药茶在一定程度上有促进红细胞聚集体的解体，降低微循环阻力和血浆纤维蛋白原浓度以及加强血液循环的作用，实验中未发现任何毒副作用。     

鳍片管表面视在发射率的理论与试验研究

本文主要以腔体辐射理论为基础，计算鳍片管表面的视在发射率，并用电功率加热法测定后加以验证，而后计算出不同尺寸的鳍片管相邻两鳍片间的视在发射率εｅ，并给出线算图，得出结论，εｅ与无因次鳍片高ｈ／γ１成正比，而与无因次片隙ａ／γ１成反比．     

低松比雾化铜粉的研制

研究了氧化／还原工艺对雾化铜粉特性的影响，实验结果表明，雾化铜粉经适当的氧化／还原处理后，其表面层变成海绵状多孔组织，这种粉末具有较低的松装比重，其压制性能得到了显著的改善，与电解铜粉相比，这种粉末保持了较好的流动性和分散性。     

对血液粘度测定的温度和时间效应的研究

报道利用ＨＴ－２型血液流变仪测定正常人与心血管病患者的全血表现粘度，研究血液粘度的温度、时间效应，以进一步探讨血液流变学的特点，寻求测定全血表观粘度的最佳和有效时间。