影响聚丙烯酰胺在土壤和水分管理应用的因素

水溶性阴离子聚丙烯酰胺(PAMs)。因其影响土壤的分散、结絮和团聚作用，稳定土壤的结构争提高土壤的渗流，使得土壤地表水的径流、土壤侵蚀和板结程度降低到最小。已被应用于不同的农业目标来有效地控制土壤侵蚀、保护地下水水质和显著地降低动物废弃水中的细菌和养分含量。对影响PAM在土壤和水分管理应用的因素，从土壤和水特性包括土壤质地、溶解盐的浓度、有机质含量对PAM吸附的影响，PAM分子量及其电荷在土壤渗透作用中的作用等两方面进行了评述，介绍了PAM在土壤和水中降解与环境安全问题和今后研究的某些方向。参36。     

Quantitative morphological investigations on smooth muscle cells in vascular surgical specimens and their clinical importance.

A distinct distribution of activated SMC could be demonstrated in atherosclerotic plaques and the neighbouring media of human beings. An increased proliferation was found in the younger age group and generally in the marginal regions of the plaques. The occurrence of activated SMC is thought to be a sequel of metabolic hypoxic damages. A high frequency of activated SMC is a bad prognostic sign in surgical specimens indicating a tendency for proliferation and occlusion.     

Night shift paralysis

12% of night nurses surveyed claimed to have suffered from a totally incapacitating paralysis that may be related to sleep paralysis, and contribute to impaired levels of safety on the night shift. The incidence of this paralysis is shown to be age-related, largely confined to the early hours of the morning, and to increase over consecutive night shifts.