同工酶技术在鸡球虫研究中的应用

本文就同工酶技术在鸡球虫种株鉴定、流行病学、遗传学研究以及耐药虫株检测等方面的应用作一阐述,并扼要分析了该技术在球虫学研究中的优缺点。     

宏门冲国家级阔叶林采种基地鸟类多样性研究初报

2003年9-10月对湖南省怀化市通道宏门冲国家级阔叶林采种基地森林鸟类多样性进行了初步研究。结果表明：基地森林鸟类共计20种，隶属4目、10科、12属。群落多样性因地型而异，即体现了较高的生物多样性保护价值，又反映了良好的生态保护效应。     

Cytocompatible cellulose nanofibers from invasive plant species Agave americana L. and Ricinus communis L.: a renewable green source of highly crystalline nanocellulose

In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications.     

Comparative studies on phenotypic plasticity of two herbs, Changium smyrnioides and Anthriscus sylvestris

INTRODUCTION Changium smyrnioides Wolff, a monotypicspecies of family Umbellaceae, occurs only in anarrow zone in the middle to eastern part of theChangjiang (Yangtze) River Basin, China. As ahighly valued medicinal herb, the fleshy roots ofthis species are widely picked, and as its habitatsare being disturbed increasingly by land use, it hasbecome an endangered species (Qiu and Fu, 2001).Anthriscus sylvestris (L.) Hoffm belongs to thesame family; has similar morphology and life…     

黑龙江省鸡东国境动植物考察

作者于1989-1999年考察了完达山、鸡东四山林区动植物,对动植物种源和基因库开发提出了看法.     

譬侔援推及其规则

《墨经》中所论譬、侔、援、推是以"类同"为根据的类比推理,运用中遵守"异类不比"的基本规则.系统阐释四种推理的内涵、特征,可见我国先秦类比逻辑的基本架构.     

保护生物多样性和人类社会可持续发展战略

现代生物灭绝的主要原因是人类活动影响的结果。保护生物多样性对人类生存和可持续发展具有十分重要的意义。为了可持续发展,首先要提高人们保护生物多样性的意识,树立适度发展、适当妥协的思想。在完善保护生物多样性的政策、制定相关法律法规、加强国际合作的同时,应当加强对生物多样性持续利用的科学技术研究,确立合理的资源管理计划,防治环境污染。     

凯里市区野生毒菌的调查

通过对凯里市区野生毒茵种类的调查，发现共有野生毒菌29种，分属于10个科12个属的种类，其中红笼头菌（Clathrus ruber）、卵盖鹅膏菌（Amanita ovoidea）为贵州省的新记录．     

井冈山自然保护区栲树群落研究

以栲树群落8个样地调查资料为基础，对该群落的物种组成、区系成分和物种多样性进行了统计和分析，结果表明：栲树并落中有维管植物51科67属98种(含变种)；属的地理成分复杂，以热带成分为主，温带成分只占较少比例；乔木层、灌木层和草本层的各项物种多样性指标在群落各样地间均有一定的差异；在群落垂直结构中，灌木层的多样性指数最大，乔木层次之，草本层最小。     

外来物种入侵与可持续发展

指出了外来物种入侵加快了生物多样性的丧失、破坏了生态系统、造成了巨大的经济损失并危害人类健康，给人类社会的可持续发展造成了严重的负面影响，并提出了减轻外来物种入侵的措施．