电脑图象分析在油菜及其近缘植物染色体研究中的应用   总被引：1，自引：1，他引：0  

蓝泽蘧  游志胜 《作物学报》1994,20(2):129-135

作者使用电脑图象分析仪对油菜及其近缘植物的9个种、50个品种作了染色体图象分析，并将上述植物的核型数据输入贮存在电脑中，初步建立了油菜及芸苔属植物核型分析数据的电脑数据库。在此基础上，作者讨论了油菜及芸苔属植物染色体电脑图象分析和电脑数据库在油菜基础理论研究和育种实际工作中的利用价值。  相似文献   

Type-I hypersensitivity as a component of eosinophilic myositis (muscular sarcocystosis) in cattle     

D E Granstrom  R K Ridley  Y Baoan  L J Gershwin  P M Nesbitt  L A Wempe 《American journal of veterinary research》1989,50(4):571-574

Eight bovine hearts with lesions of eosinophilic myositis (EM) and 2 bovine hearts without EM lesions were collected at slaughter. Blood samples from these 10 hearts, and the heart of a newborn calf also were collected. Histologically, Sarcocystis cruzi was identified in the 8 hearts with EM lesions and the 2 hearts without EM lesions, but not in the heart of the newborn calf. Serum was harvested from the 10 blood samples and was used in homologous, modified, passive cutaneous anaphylaxis tests. Antigen was prepared from S cruzi bradyzoites isolated from the 2 hearts without EM lesions. Serum samples from the 8 cattle with EM lesions reacted positively to S cruzi antigen. When heat-inactivated IgE in serum (56 C for 4 hours) was used, all passive cutaneous anaphylaxis responses were considered negative. Using ELISA, serum IgE concentrations from the 10 cattle with and without EM lesions were 2.2 to 9 U/ml. As determined by radial immunodiffusion, IgM concentrations were 80 to 215 mg/dl. Immunoglobulin G concentrations were 420 to 2,050 mg/dl, but most were less than or equal to 1,700 mg/dl. Immunoglobulin A concentrations were 0 to 62 mg/dl; 1 steer with EM lesions had 0 mg/dl. Double-gel immunodiffusion confirmed the presence of Sarcocystis-specific precipitating antibodies. Sera from the 10 cattle with and without EM lesions formed at least 1 precipitin band.  相似文献   

Effects of abiotic variables on the response of carnation cultivars to Fusarium oxysporum f.sp. dianthi     

Y. BEN-YEPHET  M. REUVEN  A. ZVEIBIL  & D. SHTIENBERG 《Plant pathology》1996,45(1):98-105

The effects of abiotic variables on the response of carnation cultivars to Fusarium oxysporum f.sp. dianthi ( F.o. dianthi  ) were examined in experiments conducted under semi-controlled environments. The abiotic variables examined were solar radiation intensity, temperature and growth substrate. Temperature was not controlled, but differed markedly among experiments, thus, its effect was not determined quantitatively. Disease incidence and disease severity varied significantly among the experiments (due mainly to differences in temperature), among the solar radiation treatments and among the cultivars tested. The three-way interaction term (i.e. cultivar × shade treatment × experiment) was highly significant ( P  < 0.001) when both disease incidence and disease severity were considered, indicating that no single variable was predominant in determining disease intensity. The effects of the growth substrate on disease progress was examined in plants grown in tuff or in tuff mixed with peat (1 : 1 and 1 : 3) substrates. The growth substrate had a potent effect on disease development in the less susceptible cultivars. Severe epidemics developed in all cultivars when they were grown in the tuff/peat mixture, although some were resistant when grown in tuff alone. These results led to the conclusion that the carnation response to F.o. dianthi is substantially influenced by the environmental conditions of the test.  相似文献   

The effects of stubble burning and tillage on soil carbon sequestration and crop productivity in southeastern Australia     

K.Y. Chan  D.P. Heenan 《Soil Use and Management》2005,21(4):427-431

Abstract. In Australia, stubble burning and tillage are two of the major processes responsible for the decline of soil organic carbon concentration in cropped soils, and the resulting soil degradation. However, the relative importance of these two practices in influencing the soil organic carbon concentration and the long-term impact on soil quality and productivity are not clear. The effects of stubble burning as practised by farmers in southeastern Australia were evaluated in two field trials, one of 19 years duration, the other of 5 years. Conventional tillage (three tillage passes) led to greater loss of soil organic carbon than stubble burning. Loss of total soil organic carbon attributed to stubble burning in the 0–10 cm layer was estimated to be 1.75 t C ha⁻¹ over the period of the 19-year trial, equivalent to 29% of that lost due to tillage. In the 5-year trial, no change in soil organic carbon due to stubble burning was detectable. Changes in soil quality associated with stubble burning detected in the longer trial included a reduction in macro-aggregate stability, and increases in pH and exchangeable K⁺. Only the latter two were detected in the shorter trial. A higher mean wheat yield (average 0.15 t ha⁻¹) following stubble burning was observed in the 19-year trial but not in the 5-year trial. Research to monitor the longer term effects of stubble burning is needed, and to identify conditions where loss of soil organic carbon is minimized.  相似文献   

黄刺蛾空间分布型研究及应用   总被引：3，自引：1，他引：2  

彭龙慧  裘有年 《江西农业大学学报》1994,16(1):57-61

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Fine structure of spreading hemocytes of an estuarine gastropod mollusc, Clithon retropictus.     

N H Kumazawa  T Imagawa  T Tanigawa  Y Tanaka 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(3):609-610

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哈达门森林公园的旅游气候资源     

韩铭哲  段广德 《内蒙古林学院学报》1996,18(2):33-38

地处阴山山系中段大青山脉林区的哈园，其气候区划为我国中温带亚干旱气候类型。就整体而言，四季分明，内陆气候特征强烈；但因巨大阴山山地效应，年降雨量超过４５０ｍｍ，植被繁茂，形成多种多样的小气候环境，以高山环境、森林环境及峡谷环境为代表，它们冷暖干湿分异形大。气候的多样性，可满足旅游者的不同要求，产生了非凡吸引力，为哈园开发建设的宝贵自然资源之一。  相似文献   

Mastitis Caused by Haemophilus somnus in a Dairy Cow   总被引：2，自引：1，他引：1  

Higgins R  Martin JR  Larouche Y  Goyette G 《The Canadian veterinary journal. La revue veterinaire canadienne》1987,28(3):117-119

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Effect of ivermectin and oxfendazole on shedding of larvae of the lungworm (Dictyocaulus viviparus) by red deer (Cervus elaphus)     

Bowie JY  Mackintosh CG  Mason PC 《New Zealand veterinary journal》1987,35(1-2):8-10

Thirty eight newly weaned hinds were randomly allocated to one of two equal groups. One group received ivermectin, the other, oxfendazole at dose rates of 0.2 mg/kg and 4.5 mg/kg, respectively. All deer were drenched four times and were grazed on pasture. Both anthelmintics reduced D. viviparus faecal larval counts to low levels 20 days after dosing, but the mean larval output and the proportion of deer shedding D. viviparus larvae at 27 and 33 days after treatment, were significantly lower in the ivermectin treated group. There was no significant difference in weight gain between the two groups throughout the trial. This study suggests that ivermectin prevents reinfection with D. viviparus for approximately 14 days longer than oxfendazole.  相似文献   

Synergistic interactions between phenylamide fungicides and respiration inhibitors in controlling phenylamide-resistant populations ofPhytophthora infestans on potato tuber disks     

Bilha Bashan  Y. Levy  Y. Cohen 《Phytoparasitica》1991,19(1):73-77

The efficacy of mixtures of respiration inhibitors and phenylamide fungicides (oxadixyl and metalaxyl) in controlling late blight was investigated using potato tuber disks. Results showed that uncoupling agents(e.g. DNP), inhibitors of ATP formation(e.g. oligomycin), ionophores(e.g, valinomycin) and inhibitors that block specific carriers in the electron transport chain(e.g. rotenone, antimycin A) increased significantly the control efficacy of both metalaxyl and oxadixyl towards populations ofPhytophthora infestons when applied to tuber slices pretreated with sublethal doses of both fungicides. When applied alone at the same doses, respiration inhibitors did not inhibit the development of the late blight fungus. Increased control efficacy of mixtures was not noted against phenylamide-sensitive populations of the fungus.  相似文献