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.     

Behaviour of plant material issued from in vitro tuberization

Summary In vitro bacterization of potato microplants with a pseudomonad bacterium,Pseudomonas spp. strain PsJN, induces developmental modifications which make them more hardy and more vigorous upon transplanting. The paper reviews previous experiments and presents recent data on the post-inoculation microplant generation response of genetically engineered and nonengineered clones, microplant response to CO₂ supplement, as well as the results of field experiments conducted between 1987 and 1993. Production of minitubers under greenhouse conditions and tuberization under heat stress in growth chamber are also presented. The use of the in vitro culture system for the development of microbial associations benefitting crop rotations is postulated.     

橡皮树的快速繁殖及试管苗温室移栽管理

以橡皮树(Ficus elastica)顶芽或带腋芽茎段做为外植体.实验表明橡皮树快速繁殖的适宜培养基为MS+6-BA 1.0～2.0 mg/l+NAA 0.01～1.0mg/l.生根培养基为1/2MS+NAA 0.1mg/l+IBA 0.5 mg/l的沙基培养基.橡皮树最适的培养温度为26～31℃.移栽采用蛭石作为苗床基质.通过合理的环境控制提高成活率.     

大岩桐的试管生根诱导与移栽技术研究

为了给大岩桐产业化开发提供理论依据和技术支撑,以无菌苗大岩桐的分化芽为试材,用IBA浓度分别为0 mg/L、0.2 mg/L0、.4 mg/L0、.6 mg/L的1/2 MS培养基进行生根诱导比较。生根苗经过炼苗处理后,栽植于6种不同的混合基质中,比较生根苗的成活率。结果显示:当IBA浓度为0.4 mg/L时,大岩桐的生根率达100%,且根系健康粗壮;混合基质按腐质土∶椰糠∶珍珠岩=1∶1∶2进行配比,生根苗有98%的成活率,移栽苗的生长状况最好,是大岩桐试管苗移栽的合适基质。     

挠盘式栽植器的运动分析与设计准则

根据挠盘式栽植器的工作原理,分析了挠盘式栽植器挠盘的运动轨迹,提出了挠盘夹持点运动特征参数λi≥1是挠盘式栽植器设计的基本依据和正常工作的必要条件;探讨了苗体在输送带和挠盘之间的传递条件,得出了夹持角p<90°是合适的投苗区间;推算出了拖拉机前进速度、输送带秧槽间距、输送带速度和栽植株距之间的关系表达式.     

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。     

毛白杨愈伤组织培养成苗的研究

采用经过选择的毛白杨优良单株的嫩枝、嫩叶、休眠过的芽和单芽茎段等外植体进行组织培养,诱导出愈伤组织。愈伤组织继代增殖分化出大量无根小苗,再诱导生根成苗,然后炼苗、田间移栽、成活率达87％。     

张掖市财政局前庭绿化中云杉和龙爪槐的移植

云杉和龙爪槐在西北地区园林绿化中运用较为普遍．笔者通过对这2种常用园林绿化树种移植过程的详细介绍,整理和总结了西北地区移植大树的基本过程和方法,旨在达到举一反三的目的。     

提高大树移植成活率的技术措施

提高大树移植成活率,必须了解大树的生长特性,遵循植物生长的规律。针对广州地区大树移植容易出现的问题,作者结合实践,研究出“似‘井’观察法”和“红泥百菌清混和液疗伤法”,可资园林同行参考。     

非适宜季节移植树木的技术探讨

在园林绿化种植中,树木成活率的高低与移植季节具有重要的联系。下面主要针对非适宜季节树木移植的技术进行探讨。