无极 白天写作夜读书

无极,曾用名秋风,原为内蒙古青少年杂志社《这一代》主编,现在内蒙古社会科学院从事文化学和哲学研究。1995年被评为呼和浩特首届'青城藏书家'。和所有藏书人一样,无极亦自幼最喜读书,一心向学,年复一年,矢志不渝。其藏书的鲜明特点是买书为藏,藏书为读,读书为用。     

运用分子标记技术鉴定亚麻花药培养中小孢子起源的植株

采用内部简单序列重复(ISSR)和随机扩增多态性DNA标记(RAPD)方法鉴定亚麻花药培养中得到的植株是否起源于小孢子。F1供试植株双亲间的多态性片段已被鉴别出来，它们在花药苗中的分离模式被用来分析这些植物的起源和确定由同一愈伤组织分化出的花药苗的同源性。运用一种ISSR引物(UBC889)和两种RAPD引物(UBC556和561)进行鉴定，16个植株中，有12个明显来自于小孢子。来自于相同愈伤组织的植株在5个多态性位点有着相同的PCR模式，因此认为这些植株极有可能来自于相同的小孢子。因此，建议用形成根的愈伤组织的数量来描述亚麻花药培养的效率。     

小花棘豆粉剂抗球虫效果初探

选用30只1日龄健康从肉鸡为动物模型，随机分为5组，每组6只，对日粮中不同剂量小花棘豆粉剂对肉鸡球虫病防治效果及生产性能的影响进行了研究。结果表明，饲料中添加1％-6％的小花棘豆粉热，具有中等程度抗球虫效果；小花棘豆作为添加剂对肉鸡的生长有一定的抑制作用。     

犊牛腹泻的综合防治方法浅谈

犊牛腹泻是在犊牛身上极为常见的一种疾病,如果得不到及时医治,会让犊牛的死亡率增加.犊牛正处于哺乳期,免疫力比较低,对于一些细菌和病毒的入侵都没有什么抵抗力,而且犊牛的肠胃极其容易受到细菌和病毒的感染,所以牛初乳对于犊牛的饲养是非常重要的,为了提高犊牛的成活率,让犊牛健康成长,就需要寻找综合防治犊牛腹泻的方法,加强犊牛的饲养管理,从而让犊牛能够健康成长.     

锡林郭勒草原旅游资源开发与可持续发展

本文对锡林郭勒草原旅游资源现状进行评价分析,并就其开发与可持续发展问题 进行了探讨。     

浅谈风水与园林植物造景

自古以来，中国人就很重视园林植物造景，特别是园林中用于绿化的植物的选择，直到今天，风水学说依然可以作为选择绿化植物的标准之一。许多植物在风水学说中有自己的特殊的含义，同时风水学说也有其独特的植物配置理论。虽说古代风水书中所提到的风水理论有一定的迷信成分，但也有科学的内容。这些风水学说中的植物配置原理不仅符合植物的生态特性、改善居住环境，同时满足人们的观赏的要求。     

牧区安全供水问题及解决办法探讨

我国牧区总面积426.62km2，约占国土总面积的44.4%。牧区主要分布在西部和北部，大部分是自然条件比较恶劣的地区。水对人的生命和健康至关重要。科学研究表明,人体的59%～66%是由水组成的。要维持人的健康基本需求,每人每天至少要得到20L安全饮用水。加上其他日常生活用水,每人每天大约需要50L水。目前,全球每6人中有1人不能持续获得安全饮用水。发展中国家80%的发病及死亡与水有关。在中国,通过饮水发生和传播的疾病就有50多种。要减少疾病,提高健康水平,最行之有效的措施就是使所有人得到安全的饮用水和合格的卫生条件。牧区安全供水有其自身固有的特点，同农村安全饮水还存在着一定的差别。列举了牧区安全供水的特点及存在的问题，探讨解决这些问题的一些途径方法。     

牟柿逡滴穹桨干杓粕蚱嫱本┯实绱笱С炭

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Growth and nutrient accumulation of Brazil nut trees (Bertholletia excelsa) in agroforestry at different fertilizer levels

The Brazil nut tree(Bertholletia excelsa) is a frequent component of agroforestry systems in the Amazon because of its adaptation to nutrient-poor upland soils and multiple uses.We investigated the aboveground biomass production(kg dry weight),nutrient uptake and requirements(N,P,Ca,Mg,K) of Brazil nut trees of different sizes grown under agroforestry conditions and fertilized at different levels.Eight of 70 experimental trees with different size were harvested and stem,branches and leaves were separated.Nutrient contents were determined for three trees of varying size.Average tree growth was fast,but variability was high,suggesting considerable potential for the improvement of this economically important species.The trees responded to increased levels of fertilizer and lime with significantly increased foliar nutrient contents and growth,probably because of the improved availability of Mg and Ca for which the species seems to have a relatively high demand.In contrast to Brazil nut trees grown in forest or dense plantations,the agroforestry trees invested a substantial part of their biomass and nutrients in large branches and developed spreading crowns.To improve stem form,reduce competition with associated crops for light and recycle nutrients,regular pruning of lower branches or planting arrangements that favor self-pruning are recommended.These measures would also increase the recycling of Ca and Mg,large quantities of which are contained in the branches.     

Why cuckoos should parasitize parrotbills by laying eggs randomly rather than laying eggs matching the egg appearance of parrotbill hosts?

The coevolutionary interaction between cuckoos and their hosts has been studied for a long time, but to date some puzzles still remain unsolved. Whether cuckoos parasitize their hosts by laying eggs randomly or matching the egg morphs of their hosts is one of the mysteries of the cuckoo problem. Scientists tend to believe that cuckoos lay eggs matching the appearance of host eggs due to selection caused by the ability of the hosts to recognize their own eggs.In this paper, we first review previous empirical studies to test this mystery and found no studies have provided direct evidence of cuckoos choosing to parasitize host nests where egg color and pattern match. We then present examples of unmatched cuckoo eggs in host nests and key life history traits of cuckoos, e.g. secretive behavior and rapid egg-laying and link them to cuckoo egg laying behavior. Finally we develop a conceptual model to demonstrate the egg laying behaviour of cuckoos and propose an empirical test that can provide direct evidence of the egg-laying properties of female cuckoos. We speculate that the degree of egg matching between cuckoo eggs and those of the host as detected by humans is caused by the ability of the hosts to recognize their own eggs, rather than the selection of matching host eggs by cuckoos. The case of Common Cuckoos(Cuculus canorus) and their parrotbill hosts(Paradoxornis alphonsianus), where it has been shown that both have evolved polymorphic eggs(mainly blue and white), was used to develop a conceptual model to demonstrate why cuckoos should utilize parrotbill hosts by laying eggs randomly rather than laying eggs matching the appearance of host eggs.In conclusion, we found no evidence for the hypothesis that cuckoos lay eggs based on own egg color matching that of the parrotbill-cuckoo system. We argue theoretically that laying eggs matching those of the hosts in this system violates a key trait of the life history of cuckoos and therefore should be maladaptive.