黄皮尖椒品种比较试验

对引进 9个黄皮尖椒品种的植物学性状、商品性状、抗病性及丰产性进行了比较试验 .结果表明 :苗丰 2 2号植株长势旺 ,产量高 (2 0 6 5 1kg·hm- 2 ) ,抗病性强 ,果实商品性好 ;9919较耐高温 ,商品外观好 ,果较长 ,产量较高 (2 0 0 87kg·hm- 2 ) ;优美 5号产量中等 ,但果色黄绿 ,果形美观 ,易为市场接受 ;茂椒 4号果色黄绿 ,果形美观 ,单果重达 4 5 .0 0g ,极具市场竞争力 .认为这 4个品种可作为海南冬季主栽辣椒品种并加以推广 .     

滨海平原农田土壤含盐量空间变异分析

以江苏省射阳县为例，对该县节水灌溉条件下农田土壤含盐量，地下水含盐量进行取样检测，应用地质统计学方法对所取得的数据进行理论分析，结果表明：该地区土壤含盐量服从正态分布，半变差函数符合五次球状函数，地下水含一服从对数正态分布，半变差函数符合三次球状函数，利用GSLIB软件，绘制了该县土壤含盐量和地下水含盐量等值线图，为该地区水土管理，防止土壤盐渍化提供了决策依据。     

砖混结构中砌体女儿墙的安全性设计

通过对砖混结构中砌体女儿墙非结构构件的分析，以及砌体女儿墙悬臂高度、女儿墙构造柱间距的的计算，得出了不同高度砌体女儿墙应采取的几种构造加强措施，以保证砖混结构中砌体女儿墙安全及其在工程设计中更广泛应用。     

Nitrification by plants that also fix nitrogen

Nitrification is a key stage in the nitrogen cycle; it enables the transformation of nitrogen into an oxidized, inorganic state. The availability of nitrates produced by this process often limits primary productivity and is an important determinant in plant community ecology and biodiversity. Chemoautotrophic prokaryotes are recognized as the main facilitators of this process, although heterotrophic nitrification by fungi may be significant under certain conditions. However, there has been neither biochemical nor ecological evidence to support nitrification by photoautotrophic plants. Here we show how certain legumes that accumulate the toxin, 3-nitropropionic acid, generate oxidized inorganic nitrogen in their shoots, which is returned to the soil in their litter. In nitrogen-fixing populations this 'new' nitrate and nitrite can be derived from the assimilation of nitrogen gas. Normally, the transformation of elemental nitrogen from the atmosphere into a fixed oxidized form (as nitrate) is represented in the nitrogen cycle as a multiphasic process involving several different organisms. We show how this can occur in a single photoautotrophic organism, representing a previously undescribed feature of this biogeochemical cycle.     

Immunogenicity of a highly attenuated MVA smallpox vaccine and protection against monkeypox

The potential use of smallpox as a biological weapon has led to the production and stockpiling of smallpox vaccine and the immunization of some healthcare workers. Another public health goal is the licensing of a safer vaccine that could benefit the millions of people advised not to take the current one because they or their contacts have increased susceptibility to severe vaccine side effects. As vaccines can no longer be tested for their ability to prevent smallpox, licensing will necessarily include comparative immunogenicity and protection studies in non-human primates. Here we compare the highly attenuated modified vaccinia virus Ankara (MVA) with the licensed Dryvax vaccine in a monkey model. After two doses of MVA or one dose of MVA followed by Dryvax, antibody binding and neutralizing titres and T-cell responses were equivalent or higher than those induced by Dryvax alone. After challenge with monkeypox virus, unimmunized animals developed more than 500 pustular skin lesions and became gravely ill or died, whereas vaccinated animals were healthy and asymptomatic, except for a small number of transient skin lesions in animals immunized only with MVA.     

陈鹤琴关于幼儿心理特点和幼儿智力开发思想述略

陈鹤琴认为,科学育儿首先要了解幼儿、研究幼儿;针对幼儿好动的心理特点,游戏、音乐等活动是“发展幼儿智力的钥匙”,感觉训练是幼儿认识环境的基础,是幼儿智力开发的重要环节;在教育活动中开发幼儿智力,应注意掌握刺激的原则、联念的原则、动作的原则及开发幼儿智力的具体作法。陈鹤琴先生关于幼儿心理特点和幼儿智力开发的思想,充分体现了他的“活教育”的主张。