具有偏利关系的Lotka-Volterra模型

给出了在偏利共生作用下的Lotka-Volterra模型.对模型进行了定性研究,并分析了在污染中偏利共生的2种群持续生存与绝灭的阈值.     

Multimodal Spectroscopic Imaging of Pea Root Nodules to Assess the Nitrogen Fixation in the Presence of Biofertilizer Based on Nod-Factors

Multimodal spectroscopic imaging methods such as Matrix Assisted Laser Desorption/Ionization Mass Spectrometry Imaging (MALDI MSI), Fourier Transform Infrared spectroscopy (FT-IR) and Raman spectroscopy were used to monitor the changes in distribution and to determine semi quantitatively selected metabolites involved in nitrogen fixation in pea root nodules. These approaches were used to evaluate the effectiveness of nitrogen fixation by pea plants treated with biofertilizer preparations containing Nod factors. To assess the effectiveness of biofertilizer, the fresh and dry masses of plants were determined. The biofertilizer was shown to be effective in enhancing the growth of the pea plants. In case of metabolic changes, the biofertilizer caused a change in the apparent distribution of the leghaemoglobin from the edges of the nodule to its centre (the active zone of nodule). Moreover, the enhanced nitrogen fixation and presumably the accelerated maturation form of the nodules were observed with the use of a biofertilizer.     

高产Nisin和高产LAB EPS乳酸菌共生株筛查

通过对10株产Nisin乳酸菌株和10株产LAB EPS乳酸菌株进行培养、筛选和测定,筛选出3株高产Nisin的乳酸菌株和3株高产LABEPS的乳酸菌株,进而对3株高产LAB EPS乳酸菌株和3株高产Nisin乳酸菌株进行复合发酵试验,最终筛选出可共生的高产Nisin乳酸菌株和高产LAB EPS乳酸菌株各1株。     

共生发酵制备魔芋飞粉发酵乳的研究

运用微生态原理,将有益微生物黑曲霉、酿酒酵母、乳酸菌等五菌接种到魔芋飞粉基质上,进行液态共生发酵。通过菌体生长曲线的测定,确定五菌各自在飞粉中生长的规律。同时,进行单菌、三菌和五菌共生发酵;通过正交设计试验,检测发酵乳的酸度和蛋白酶活,并以飞粉中淀粉和粗蛋白转化率为优化指标。最终筛选得到五菌共生发酵的最佳发酵工艺为:在34℃下,黑曲霉、保加利亚乳杆菌、嗜热链球菌、葡萄酒酵母、啤酒酵母以1∶1∶2∶2∶2的菌种比例,按10%(5mL)的接种量接种至pH值为6.8的飞粉基质中,以120r/min摇床发酵48h。     

双歧杆菌混合培养初步研究

本文研究了长双歧、青春双歧及两歧杆菌单独培养的生长和代谢规律，并对三种菌株混合发酵培养进行了研究。结果表明，这三种菌株在特定培养基中具有共生关系，通过分开接种、添加低聚糖和流加碱能大大促进混合菌株的生长。     

Production of the Quorum-Sensing Molecules N-Acylhomoserine Lactones by Endobacteria Associated with Mortierella alpina A-178

Gram‐negative bacteria communicate with one another using N‐acylhomoserine lactones (AHLs) as signaling molecules. This mechanism, known as quorum sensing (QS), is needed to develop pathogenicity, as well as symbiotic interactions with eukaryotic hosts, such as animals and plants. Increasing evidence indicates that certain bacteria, namely endobacteria, also inhabit fungal cells and establish symbiotic relationships with their hosts. However, it has not been clear whether bacterial QS acts in developing the relationships. Here we describe the isolation and identification of N‐heptanoylhomoserine lactone and N‐octanoylhomoserine lactone from the culture broth of the zygomycete fungus Mortierella alpina A‐178. This suggested the presence of endobacteria in the fungus, as was confirmed by PCR, fluorescence in situ hybridization, and transmission electron microscopy. Two major bands obtained by PCR‐denaturing gradient gel electrophoresis showed sequence identity to genes in the β‐proteobacterium Castellaniella defragrans (100 %) and the Gram‐positive bacterium Cryobacterium sp. (99.8 %). The production of AHLs depended on the presence of endobacteria and was induced in response to the increase in the concentration of AHLs, suggesting that the bacterium conducts AHL‐mediated QS in the fungus. This paper is the first to report the production of AHLs by endofungal bacteria and raises the possibility that QS plays roles in the development of fungus–endobacterium symbiosis.     

基于共生理论的鄱阳湖城市圈可持续发展研究

我国正处于城市化加速发展阶段,而城市圈是我国城市化发展的必经阶段,也是更高级的阶段。作为中部地区较有代表性的新兴城市圈--鄱阳湖城市圈的发展具有较强的研究意义。共生理论的本质是合作与协调,这与城市圈的发展理念是相吻合的。文章从共生理论的视角出发,首先对鄱阳湖城市圈共生现状进行了特征分析。然后,结合当前理论基础与鄱阳湖城市圈的实际情况构建了包含经济、社会、资源和环境4个子系统,21项指标的综合测度评价体系,并运用因子分析法计算出鄱阳湖城市圈所含的8个城市在各主成分上的得分以及综合得分。研究发现鄱阳湖城市圈存在发展不平衡、辐射范围小、规划整体性低、可持续发展意识地区差异大等问题。最后针对这些问题,从6个方面提出建议以推动鄱阳湖城市圈的可持续发展。      

浅谈建筑与艺术的共生关系

阐述了建筑是人们生活的家园，它作为人类栖居的场所，是永远和人类发展联系在一起的，建筑的历史和人类的历史一样漫长，且从建筑上的风格、流派、观念等，对艺术进行了探索与思考。     

乡村“人地共生”景观单元认知框架

针对当前中国浙北乡村经济发达地区半城市化乡村的乡村景观营建同质化、偏重外观审美、忽略内生动力等问题,基于乡村“人地关系”的概念与“单元系统”理论,建立乡村“人地共生”景观单元的认知框架,提出以村域为景观生成与演变的单元。通过“单元系统—单元自成”程序的调控,明确村域景观特征在人地互动作用下的空间生成与演变机制,并建构了乡村景观营建在村域尺度上的基本模式。首次从较小的村域尺度和人地互动的内生动力视角研究乡村景观的生成与演变机制。     

Industrial symbiosis of very large-scale photovoltaic manufacturing

In order to stabilize the global climate, the world's governments must make significant commitments to drastically reduce global greenhouse gas (GHG) emissions. One of the most promising methods of curbing GHG emissions is a world transition from fossil fuels to renewable sources of energy. Solar photovoltaic (PV) cells offer a technically sustainable solution to the projected enormous future energy demands. This article explores utilizing industrial symbiosis to obtain economies of scale and increased manufacturing efficiencies for solar PV cells in order for solar electricity to compete economically with fossil fuel-fired electricity. The state of PV manufacturing, the market and the effects of scale on both are reviewed. Government policies necessary to construct a multi-gigaWatt PV factory and complementary policies to protect existing solar companies are outlined and the technical requirements for a symbiotic industrial system are explored to increase the manufacturing efficiency while improving the environmental impact of PV. The results of the analysis show that an eight-factory industrial symbiotic system can be viewed as a medium-term investment by any government, which will not only obtain direct financial return, but also an improved global environment. The technical concepts and policy limitations to this approach were analyzed and it was found that symbiotic growth will help to mitigate many of the limitations of PV and is likely to catalyze mass manufacturing of PV by transparently demonstrating that large-scale PV manufacturing is technically feasible and reaches an enormous untapped market for PV with low costs.