Gro?forschung mit anderen Namen

Naturwissenschaften Aktuell

Großforschung mit anderen Namen     

The ladybird<Emphasis Type="Italic"> Thalassa saginata</Emphasis>, an obligatory myrmecophile of<Emphasis Type="Italic"> Dolichoderus bidens</Emphasis> ant colonies

The larvae and pupae of the ladybird Thalassa saginata develop inside colonies of the dolichoderine ant Dolichoderus bidens. This association is the first specific and obligatory relationship recorded between ants and ladybirds. The ants provide shelter and protection to the larvae but the diet of the latter remains unclear. The integration of T. saginata larvae into the ant colonies is achieved by mimicking the cuticular patterns of the ants brood. Moreover, the larvae secrete substances from their hairs and anal gland that are likely to enhance their attractiveness.     

Biomineralization in plants as a long-term carbon sink

Carbon sequestration in the global carbon cycle is almost always attributed to organic carbon storage alone, while soil mineral carbon is generally neglected. However, due to the longer residence time of mineral carbon in soils (10²–10⁶ years), if stored in large quantities it represents a potentially more efficient sink. The aim of this study is to estimate the mineral carbon accumulation due to the tropical iroko tree (Milicia excelsa) in Ivory Coast. The iroko tree has the ability to accumulate mineral carbon as calcium carbonate (CaCO₃) in ferralitic soils, where CaCO₃ is not expected to precipitate. An estimate of this accumulation was made by titrating carbonate from two characteristic soil profiles in the iroko environment and by identifying calcium (Ca) sources. The system is considered as a net carbon sink because carbonate accumulation involves only atmospheric CO₂ and Ca from Ca-carbonate-free sources. Around one ton of mineral carbon was found in and around an 80-year-old iroko stump, proving the existence of a mineral carbon sink related to the iroko ecosystem. Conservation of iroko trees and the many other biomineralizing plant species is crucial to the maintenance of this mineral carbon sink.     

建设农村小康社会与发展生态农业

论述生态农业在建设农村小康社会中的重要作用，分析生态农业面临的形势和问题，并提出政策建议。     

魔芋葡甘聚糖在污水处理中的应用

该文就魔芋葡甘聚糖的发展研究状况作了概述，并探讨其与蛋白质共混胶应用于水处理的可能性。     

武夷山国家级风景名胜区的游憩价值评估

采用收益资本化的方法，对武夷山国家级风景名胜区进行游憩价值的经济评估，从定量的角度确定该景区的开发潜力，从而更清楚地认识到良好的生态环境具有较高的环境价值，为该地区的旅游规划与管理提供科学的参考。     

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全国环境区划技术方法探讨

本文对全国环境区划的原则、指标、分区方法,等级单位划分等问题进行了探讨     

BOD测定的仪器法与化学法关系初探

本文介绍了在实验室中运用压差式仪器法测定BOD值的优越性,并着重与相应的化学稀释法所测BOD值进行对照.通过计算机找出二者的相关关系,以便得到准确的BOD值进而推广利用BOD测定的新技术.