胚胎移植德系西门塔尔种公牛在山东地区的适应性观察

选择胚胎移植获得的德系西门塔尔公牛11头,对其0~30月龄的体型外貌、生长发育、精液生产能力、抗病性及环境适应能力进行观察,分析其在山东地区的适应性。结果表明:其体型外貌特征符合本品系特征,外貌评分达特级;平均初生重46.32 kg,30月龄平均体重达955.45 kg,整个观察期平均日增重1.06 kg;30月龄体高达152.55 cm,体斜长172.73 cm,胸围、腹围与管围分别达到233.82、262.09和25.64 cm,睾丸围达41.23 cm;平均采精量6.60 mL,精子密度7.35亿个/mL,精子平均活力为56.23%,精液利用率67.99%,平均制冻数量28 642支;观察期无重大疾病发生。综上所述,德系西门塔尔种公牛在山东地区饲养达到了培育目的,适合在该地区推广。     

叶菜种苗移植机器人开发

目前叶菜生产作业环节机械化程度低,国内外针对蔬菜苗由穴盘向栽培槽内移植的自动移植机尚未有研究。本文对叶菜种苗移植机器人进行开发,实现了将叶菜种苗由穴盘向栽培槽自动移植,在保证95%移植作业成功率条件下,移植生产率可达1 500株/h,约为人工移植作业的2倍以上,显著提高了叶菜种苗移栽作业的生产率。     

ULTRASONOGRAPHIC EVALUATION OF RENAL AUTOGRAFTS IN NORMAL CATS

The purpose of this study was to determine changes in resistive index (RI) and renal size that occur in normal feline kidney autografts in the immediate post-transplant period. Qualitative changes in renal parenchymal echogenicity and pelvic dilation were also noted, although this was not a major focus of the study. Fourteen domestic short-haired cats underwent bilateral nephrectomies followed by an autograft of the right kidney to either the aorta or external iliac artery. Due to post-operative complications, only nine of these cats completed the study. Ultrasonographic determination of the RI and renal size was made before transplantation and on days 1, 4, 7, 10, and 13 following transplantation. No significant changes in renal RI were identified during the study. Renal size increased significantly, peaking at 63% above baseline on day 7, and stayed elevated at 50% above baseline on day 13. There was no evidence of rejection or other abnormalities found on histologic evaluation of the transplanted kidneys. It was concluded that the RI of normal feline renal autografts does not significantly change in the immediate post-operative period. However, significant renal enlargement, likely due to a combination of post-operative edema and hypertrophy, does occur. This study provides baseline information for comparison with feline allografts in the immediate post-transplant period.     

福建双季晚稻机械化育插秧中的问题与对策

目前双季晚稻应用机械化育插秧技术过程中常发生的主要问题有：选用的品种（组合）生育期偏长,秧苗超秧龄严重;出苗不齐,成苗率低;秧苗徒长,苗高超标。通过选择生育期适当的品种（组合）,出苗期采用日灌夜排的水分管理方法,适当减少秧田用肥量并施用多效唑控制苗高可以解决这些问题。双季晚稻大面积生产上推广应用机械化育插秧技术有利于增产增收,节本增效。     

不同育苗移栽方式对辣椒经济性状的影响

通过对辣椒不同育苗移栽方式进行比较试验,结果表明:营养钵假植移栽的产量和经济效益显著高于漂浮育苗移栽和露地育苗直接移栽,营养钵假植移栽的增产机理是移栽后辣椒无明显的缓苗期,根系发达,植株生长整齐,长势好,分枝能力强,单株挂果多.漂浮育苗移栽和露地育苗直接移栽产量差异不显著,主要是漂浮育苗现在还没有专用的辣椒育苗营养液,成株后分枝能力弱,挂果枝少,单株挂果少.     

Cucumber fruit quality at harvest affected by soilless system,crop age and preharvest climatic conditions during two consecutive seasons

Cucumber fruits (Cucumis sativus L., cv. Trópico F1) grown on perlite substrate and NFT (Nutrient Film Technique) were harvested during two seasons (winter and spring) to monitor the effects of climatic conditions and hydroponic growth systems on fruit quality at harvest. The best fruit quality at harvest, as measured by lightness and hue angle parameters, was obtained during the 3 weeks following the first winter picking. When values of a parameter of preharvest climate value called G^* were lower than 0.4 MJ m⁻² °C day⁻¹ interval⁻¹, the cucumber achieved its optimum quality at harvest, as measured by the dark green color of the skin. NFT-grown fruits showed darker and greener skin color (higher hue angle and lower lightness) compared with perlite-grown fruit, irrespective of the season considered. During the winter season, the plant transpiration rate was 30% higher in perlite than in NFT culture, which correlates with higher differences in G^* and 40% additional yield in perlite. However, in spring G^* was not sensitive enough to discriminate between the two hydroponic systems. In general, fruit quality at harvest in spring was lower than during the winter, due to flesh whitening, higher longitudinal and equatorial calibers, and slightly higher pH, as well as worse epidermal color coordinates (ranging from the dark and dull green color typical of winter fruit to light and a vivid green-yellow color). During the spring season, NFT-grown fruit were less acid than perlite-grown fruit with no apparent correlation with the climatic conditions or fruit nutrition.     

4PU、NAA、IBA在中华猴猕桃微繁殖技术中的应用研究

研究结果表明:1.使用新型的苯基脲衍生物4pU与生长素配合,可明显提高茎段和离体叶片的分化,其活性约为6苄基氨基嘌呤、6-BA)、玉米素(ZT)的10倍。2.在附加4pU(1毫克/升)的培养基上,分化不定芽和茎段丛生芽,个体发育较弱,须经在低浓度4pU(0.3～0.5毫克╱升)和6-BA(1毫克/升)培养基中再培养,方可获得健壮的试管苗。3.中华猕猴桃试管苗在1/2MS+NAA_(0.5)+IBA_(0.5)的培养基中培养10天后,移栽成活率可达95％左右。     

并联移栽机器人视觉的研究——基于图像的秧苗位置确定

以三平移并联机器人视觉系统为研究对象.采用超绿色(Extra Green)特征分割方法对植物秧苗在钵盘中的彩色图像进行分析,提取出图像中绿色成分,并进行二值化处理;然后,对二值图运用质心法、形态学运算法和中点法3种方法确定图像中心位置,并综合比较3种运算方法,得出确定秧苗根茎位置的最佳方法为形态学运算法.     

Luteotrophic and luteolytic effects of nitric oxide in sheep are dose-dependent in vivo

It has been suggested that nitric oxide (NO) acts in either an anti-luteolytic or in a luteolytic manner, but the mechanism for these opposing roles is unclear. We hypothesized that NO may act in a dose-dependent manner to regulate luteal function, whereby low concentrations of NO might stimulate luteal progesterone production (i.e. luteotrophic) and high concentrations of NO might reduce concentrations of plasma progesterone (i.e. luteolytic). To test this hypothesis we infused increasing concentrations of the fast-acting NO donor, dipropylenetriamine NONOate (DPTA), into the arterial supply of sheep with ovarian transplants bearing a corpus luteum (CL). Infusions were performed on sheep with CL 11 days of age (n=9) or over 30 days of age (n=15). We measured changes in the concentration of progesterone in ovarian venous plasma during the 1-h infusion and for 24h after the infusion, and then compared the mean concentration of progesterone between treatment groups for effects by dose and dose by period interactions. Compared with saline-treated controls (n=6), the highest dose of 1000 microg/min DPTA (n=6) reduced (P0.05) in sheep infused with the lowest dose of 1 microg/min DPTA (n=6) compared with controls. We conclude that NO regulates luteal function in a dose-dependent manner in sheep in vivo.