云南西双版纳勐腊并殖吸虫成虫扫描电镜观察

目的 是通过扫描电镜(SEM)观察勐腊并殖吸虫成虫体棘、口、腹吸盘．为鉴别其虫种提供资料。方法为直接从人工感染的猫体内解剖取出勐腊并殖吸虫成虫，用2．5％戊二醛和1％锇酸固定后，乙醇脱水，离子溅射仪镀金，JSM-820扫描电镜观察。结果表明云南西双版纳瑶瓦区阿括拿青(阿括拿青)虫体的体棘均为丛生型皮棘。新回宽寨老熊青(老熊青)虫体体棘在腹吸盘上方以单棘为主，偶见双棘。腹吸盘下方，为单双棘混合存在。结论认为从SEM形态观察发现勐腊两个不同点采集的勐腊并殖吸虫形态上不完全相同，存在一定的差异。     

Boundary-fitted grid in landscape modeling

Landscape modeling requires the delineation of system boundaries and interior features. Quite often, these components are complex and difficult to accurately represent. A rectangular grid is used to represent the study and adjacent non-study areas in most cases. When the non-study area occupies a large portion of the grid, computer memory is wasted, and computational time increases. An elliptical grid generator for non-orthogonal curvilinear coordinates is used to generate a boundary-fitted grid for a landscape model. In a boundary-fitted grid coordinate system, one coordinate axis follows the landscape domain boundary and is non-orthogonal to the second axis. The boundary-fitted grid uses elliptic partial differential equations to distribute grid points inside the landscape domain. Although the boundary-fitted grid follows the domain boundary, the grid pattern and point allocation remain structured. Thus, a landscape model can use a boundary-fitted grid without changing the model’s data structure or the computational scheme. In this study, a boundary-fitted grid and a raster-based grid were applied to the Everglades Landscape Fire Model. Use of the boundary-fitted grid decreased model simulation time by about one fifth and computer storage by 58% relative to the raster-based grid. Also, the linear characteristics of interior geographical features such as rivers and airboat trails were preserved by the boundary-fitted grid, but not by the raster-based grid. This preservation provided a more reasonable base map for simulating ecological processes, such as fire across heterogenous landscapes.     

论电路中的干扰形成及干扰抑制技术

本文对电路中的噪声的形成进行分析,并对噪声干扰的抑制技术进行探讨。     

三阶时滞泛函微分方程解的渐近性

本文讨论一类三阶时滞泛函微分方程解的渐近性质,给出了若干解的有界性及解趋于零的判定准则.     

角形区域的Teichmuler极值映照

采用二次微分的方法，得到了角形区域Ω１的Ａｆｆｉｎｅ变换关于其边界值不是极值映照．并明确给出在边界同伦下唯一极值的Ｔｅｉｃｈｍｕｌｅｒ映照．     

加工现场微机控制系统抗干扰的研究

针对制造业加工现场的环境特点，分析了微机控制系统的干扰来源和途径，介绍了实用的抗干扰措施。实践证明：这些软硬件抗干扰措施的综合运用，使自动化加工中微机控制系统的稳定性得到了较大的提高。     

The RNA interference

The phenomenon of RNA interference (RNAi) is highly conserved mechanism in the organism evolution. As a immune system, RNAi is a ubiquitous mechanism against invading microorganism in plant and animal cells. Recently, it has been found that RNAi is the process by which double-strand RNA(dsRNA) directs sequence-specific degradation of messenger RNA and the mediations of sequence specific messenger RNA degradation are 21-and 23-nucleotide small interfering RNAs that generate by ribonuclease from endogenous longer dsRNA or by transfectious technics from heterologous dsRNA. Over the past few years, the way in which cells respond to dsRNA by silencing homologous genes has revealed a new regulating paradigm in biology.     

Influence of death struggle on the structural changes in chub mackerel muscle during chilled storage

ABSTRACT: Chub mackerel (34–35 cm, approximately 500 g), which were caught by fishing with a rod and line at the Bungo Channel, Oita prefecture, were rested overnight in a fish preserve and either killed by decapitation (control group) or allowed to struggle in air for 30 min (struggled group). Muscle samples were excised every 4 h, and measurements on breaking strength and histological observations were done for both groups. The breaking strength of muscle in the control group was significantly higher than that in the struggled group, whereby a decrease in breaking strength was delayed for 12 h compared to the struggled group. Light microscopy showed space extension among muscle cells in association with a decrease in breaking strength. Especially in the struggled group, the extended area was larger and the difference in area was significant at the time when breaking strength showed a significant difference. Using electron microscopy, the extended area showed cut and/or disappeared collagen fibrils. From these results, it was demonstrated that struggling to death promoted the degradation of collagen fibrils and the weakening of connective tissue and, resultantly, led to the faster softening of muscle of chub mackerel.     

黄艾美球虫侵犯宿主组织的超微研究

利用透射电镜和扫描电镜相结合的技术对黄艾美球虫（E.flavescens）人工感染后的子孢子移动过程及被虫体寄生的宿主细胞形态学变化和粘膜形态学变化进行了观察。子孢子在进入小肠腺上皮过程中需白细胞介导，在白细胞内可发育成球形的滋养体，观察到有两个子孢子侵入同一白细胞的现象，但分别存在于各自的带虫空泡中，黄艾美球虫引起的肠粘膜损伤主要发生于感染177小时之后，其损伤主要表现在绒毛大片脱落，结缔组织裸露，表面可见到大量破损的孔洞及大量肠杆菌，被虫体寄生的腺上皮细胞基部膨胀，微绒毛脱落，细胞核膨大并部分包被虫体，有些细胞核裂解为二。