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Zheng Xiaoxian Liu Donglan College of Forest Resources Environment Beijing Forestry University Beijing P.R.China 《中国林学(英文版)》1996,(1)
该文探讨了不用编制削度表直接建立高精度立木干曲线的方法.当采用干曲线是3次多项式时,通常根据10分法测定树干各部位直径,用最小二乘法求出该方程式的参数.从数学角度,只要知道树干任意3个部位的直径,就可以用最小二乘法或联立方程式求解干曲线参数.本文以樟子松为例,探讨用树干哪3个部位直径拟合的干曲线最接近实际干曲线,为建立立木干曲线提供有效方法.利用9个部位半径(方法Ⅰ)和利用其中3个部位半径(方法Ⅱ,28种组合)分别拟合干曲线,结果表明方法Ⅱ的6种半径组合的精度良好,其中的3种组合,(r1.3,r0.3,r0.7),(r1.3,r0.4,r0.7)和(r1.3,r0.4,r0.8)是拟合现实干曲线的有效方法. 相似文献
146.
Lack of effect of recombinant bovine interferon alpha I1 in the treatment of experimentally-induced bovine warts. 下载免费PDF全文
Fifteen four-month old calves were inoculated, on five scarified sites on each side of the neck, with a suspension of ground wart tissue from a steer naturally infected with bovine papilloma virus 1. Warts started to appear about one month postinfection and were measurable in ten calves two months postinfection, when the trial started. After stratification on the size of the warts, all fifteen calves were allocated randomly to one of the following treatment groups: twice weekly intramuscular injections of 5 mg recombinant bovine interferon alpha I1 (rBoIFN alpha I1), weekly injection of 5 mg of rBoIFN alpha I1 or placebo, for three weeks. The biggest wart on each calf at the beginning of the trial was measured and photographs of all warts were taken weekly for five weeks. An analysis of covariance on the log of the volumes of warts during the five weeks of the trial showed a significant difference between groups (p = 0.026). Warts in treated groups tended to grow faster than in the placebo group. 相似文献
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Epidemiological study of enzootic pneumonia in dairy calves in Saskatchewan. 总被引:4,自引:0,他引:4 下载免费PDF全文
J Van Donkersgoed C S Ribble L G Boyer H G Townsend 《Canadian journal of veterinary research》1993,57(4):247-254
A field study involving 325 calves from 17 dairy herds in Saskatchewan was conducted to determine the risk of enzootic pneumonia and to assess its association with a number of factors. Two different case definitions of pneumonia were used in the analyses: the first was based on producers' treatment risk (CASE1) and the second was based on semimonthly clinical examinations of calves by the research veterinarian (CASE2). The risk of pneumonia based on CASE1 was 39% and on CASE2 was 29%. The measure of agreement between CASE1 and CASE2 at the calf level of analysis was poor (kappa = 0.24, SE = 0.02) and at the herd level of analysis was moderate (kappa = 0.40, SE = 0.12). The mortality risk from pneumonia was 1.8% and a variety of infectious organisms were isolated from pneumonic lungs. Twenty-seven percent of the calves had inadequate (total IgG < or = 800 mg/dL) levels of passively acquired antibodies as measured by radial immunodiffusion. The proportion of seropositive titers in calves within the first two weeks of age was 94% to parainfluenza 3 virus (PI3V) and bovine respiratory syncytial virus (BRSV), 73% to Pasteurella haemolytica (Ph), 68% to bovine viral diarrhea virus (BVDV), 67% to infectious bovine rhinotracheitis virus (IBRV), 46% to Mycoplasma dispar (Md), 44% to Haemophilus somnus (Hs), and 21% to Mycoplasma bovis (Mb). At the calf level of analysis and after adjusting for clustering, there was a negative association (p = 0.10) between the diagnosis of pneumonia based on CASE2 and total IgG levels and Ph titers (rPh).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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新城疫(ND)—减蛋综合征(EDS76)蜂胶二联灭活疫苗的研制Ⅰ.制苗工艺、疫苗安全性和免疫原性试验 总被引:6,自引:0,他引:6
将新城疫病毒(NDV)Colon-30株和减蛋综合征病毒(EDS76AV)-127株分别接种于非免疫鸡胚和鸭胚,制备抗原液。抗原液经甲醛灭活后,与纯化的天然免疫增强剂蜂胶乳化,制成鸡新城疫(ND)-减蛋综合征(EDS76)蜂胶二联灭活疫苗,对疫苗的安全性和免疫原性进行了测定。对3-6周龄易感雏鸡以2倍使用剂量肌内注射,安全性良好;对1日龄雏鸡接种1个使用剂量进行急性毒性试验。15d生长曲线表明,对雏难 影响。对6周龄雏鸡注射1个使用剂量,每批疫苗免疫10只鸡,免疫后5-32d,鸡血清中EDS76血凝抑制(HI)抗体的几何平均滴度(GMT)为6.5-11.8log2,ND血凝抑制(HI)抗体的几何平均滴度(GMT)为4.8-9.8log2;对ND免疫攻毒试验表明,3批疫苗,每羽份含有的半数保护量(PD50)分别为≥127、≥131和≥127。 相似文献