Microbial‐Enhanced Phytoremediation of Lead Contaminated Calcareous Soil by Centaurea cyanus L          下载免费PDF全文

Akbar Karimi  Habib Khodaverdiloo  Mir Hassan Rasouli‐Sadaghiani 《洁净——土壤、空气、水》2018,46(2)

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海洋丝状真菌降解原油研究Ⅱ.砂砾中油污去除室内模拟试验     

林凤翱  冯志权  李洪  于占国  张映  贺杰 《海洋学报》1999,21(6):116-123

１引言现有的大量实验研究结果表明［１－４］,从海洋环境中分离出的降解石油烃细菌和酵母不仅对不同油种降解差异较大、降解率较低,而且它们大都在小油滴中生长,那里的营养盐和氧含量往往限制其生长繁殖和降解石油烃能力,所以,要应用海洋细菌和酵母清除海上油污,就...  相似文献   

New evidence of microbe origin for ferromanganese nodules from the East Pacific deep sea floor   总被引：3，自引：0，他引：3  

HU Wenxuan  ZHOU Huaiyang  GU Lianxing  ZHANG Wenlan  LU Xiancai  FU Qi  PAN Jianming  ZHANG Haisheng 《中国科学D辑(英文版)》2000,43(2):187-192

Using a fluorescence microscope and EPMA, abundant microbe ”bodies“ and clear microbic fluorescent microstructure are determined in the ferromanganese nodules recently collected from the East Pacific deep sea floor. The microbic fluorescent structure shows a close relation to the formation of the ferromanganese nodules. According to their morphological features, the microbes are classified into two types: one is named clumpy microbe, which takes a bar-shaped manganese mineral as a pillar and grows like fasciculate coral, resulting in irregular cauliflorate nodules with rough surfaces; the other is called filamentous microbe, which grows in very thin arcuate and/or concentric circular laminae composed of a microbe layer and a metal (manganese and iron)-rich layer, leading to potato-shaped nodules with relatively smooth surfaces. It also can be seen that the two types of microbes are intergrown together, resulting in nodules complicated in compositions and shapes.  相似文献   

南极生境真菌Gliocladium catenulatum T31菌株杀虫活性的研究   总被引：2，自引：0，他引：2       下载免费PDF全文

牛德庆  田黎  周俊英  郑立  陈靠山 《极地研究》2007,19(2):131-138

本文对影响南极生境真菌Gliocladium catenulatum T31生长和杀虫活性的初始pH值、发酵时间、培养温度等影响因子进行了研究。并以小菜蛾为试虫,以校正死亡率为评价指标,利用微型平板法对真菌T31的杀虫活性进行测试,发酵液杀虫活性最高为60.42%。发酵物乙酸乙酯提取后,丙酮溶解0.33mg/mL浓度下,发酵液提取物杀虫活性最高为82.05%,菌体提取物杀虫活性为76.92%。盆栽试验证明该菌株发酵液对小菜蛾第7d的虫口减退率为54.2%。  相似文献   

抚仙湖近60年来沉水植物群落变化趋势分析     

高弋明  殷春雨  刘霞  赵钰  陈非洲  陈新芳  关保华 《湖泊科学》2021,33(4):1209-1219

自1960s以来,抚仙湖沿岸带沉水植物群落发展迅速,而监测频率相对不足.为了解抚仙湖沉水植物群落现状及过去60年内的变化趋势,于2016年7月,对抚仙湖全湖沉水植物进行调查,并结合以往多次调查数据进行趋势分析.本次调查设置了36条样带共41个样点.在实测数据验证后,使用卫星多光谱相机数据基于归一化植被指数(NDVI)计...  相似文献   

Impacts of riparian afforestation on stream biofilms: An exotic forest‐native grassland comparison     

Ross M. Thompson  Colin R. Townsend 《新西兰海洋与淡水研究杂志》2013,47(5):895-902

The nature of benthic biofilm was assessed in four streams in New Zealand, two flowing through native tussock grassland and two through exotic Pinus radiata forest. Components of the biofilm were described using epi‐fluorescent staining (DAPI) and scanning electron microscopy (SEM) of rock and wood substrata. DAPI and SEM analyses showed significantly more bacteria and fungi on rock and wood in tussock as opposed to pine streams. This emphasises the importance of the heterotrophic community even in systems which have abundant light available for primary production. The lack of a significant heterotrophic biofilm in pine streams was unexpected, and we speculate that chemical characteristics of the water may be responsible.  相似文献   

Benefits of mycorrhizal inoculation in reintroduction of endangered plant species under drought conditions     

《Journal of Arid Environments》2013

Numerous human activities constitute threats to biodiversity. The effects of climate change, including increasing drought in already arid lands, pose an additional layer of uncertainty in the fate of rare species. In the case of plants, reintroduction is becoming an important active management practice in species conservation. We hypothesized that even under extreme drought inoculation with mycorrhizal fungi would increase growth rates of an endangered plant in experimental reintroduction. We selected a plant species, Abronia macrocarpa, and conducted the experiment in Texas while the area was experiencing mild and extreme drought intensities. Treatment plots were planted with seed inoculated with arbuscular mycorrhizal fungi and control plots were planted with seed coated with autoclaved inoculant. We analyzed measurements of growth and development of germinated plants. Mean number of leaves was greater in treatment plants (P = 0.005) and mean aerial diameter was larger in treatment plants (P = 0.02) than in control plants. Significantly improved growth suggests that inoculation is a viable technique to increase reintroduction success in plant species especially during periods of drought.  相似文献   

真菌孢子烷烃生物标志物特征及其热演化试验的初步研究   总被引：1，自引：1，他引：1  

张惠之  王开发 《地球化学》1997,26(3):37-44

以一种类似地层中无孔多胞孢的现代真菌链格孢属孢子为样品，研究真菌孢子的原生烃烷烃馏分生物标志物及其热解生烃特征。实验结果表明，真菌孢子样品原生烃类的烷烃馏分，主要由正烷烃、异构烷烃和链烯烃相成。正烷烃约占抽提物总量的０．１８％、ｎＣ１９，烷占正烷烃总量的２４．１％。  相似文献   

Phenolics and Proteins Affecting Palatability of Spartina Leaves to the Gastropod Littoraria irrorata     

Felix  Bärlocher Steven Y.  Newell 《Marine Ecology》1994,15(1):65-75

Along the southeastern coast of the United States, the saltmarsh periwinkle Littoraria irrorata is a major consumer of Spartina alterniflora . It prefers to feed on dead rather than living plants. During senescence and early decay, S. alterniflora leaves become colonized by fungi, their phenolic content declines, and their lipid content increases. In this study, the food preferences of L. irrorata were assessed by offering intact leaves or leaf powder suspended in agar. Relative palatabilities were determined by measuring the weight loss of intact leaves, or by estimating the area of feeding marks left on the surface of leaf powder suspensions. Both techniques demonstrated a clear preference for standing dead rather than yellow-green (senescent) leaves. Yellow-green leaves contained methanol-soluble feeding deterrents. A comparable deterrent effect could be achieved by adding ferulic acid, a phenolic compound common in yellow-green S. alterniflora , to leaf powder. The deterrent effects of methanol extracts or ferulic acid could be neutralized by simultaneously adding fungal mycelium or BSA. Littoraria irrorata preferred leaves colonized by fungi or bacteria over sterile leaves. When offered a choice of sterile leaves colonized by different fungi, the results were variable. In one experiment, L. irrorata clearly preferred one of three leaffungus combinations. The same preference was shown after the food items were treated with methanol/chloroform to remove lipids. In a second experiment with four other fungal strains, there was only a clear preference for one leaf-fungus combination after removal of lipids. The results suggest that the saltmarsh periwinkle prefers S. alterniflora leaves with low concentrations of phenolic deterrents, most likely ferulic acid, and with sufficient fungal biomass. The food choice may be influenced to a smaller degree by fungal components, which, depending on the species or strain, may be lipids or other compounds.  相似文献   

内蒙古大青山高等真菌垂直分布规律及资源评价     

刘培贵 《山地学报》1992,(1)

内蒙大青山高等真菌垂直分布分为三个垂直带谱:1.浅山带以蘑菇属Agaricus、口蘑属Tricholoma和腹菌类Gasteromycetes为主;2.中山带以卷边桩菇Paxillus involutus、乳菇属Lactarius、蘑菇属和乳牛肝属Suillus等常见;3.深山带以瘤柄牛肝属Leocinum和毒伞属Amanita居多。食、药用及菌根菌150余种,其中蒙古口蘑Tricholoma mangolicum为著名食、药用菌,对牛、羊的分娩有催产作用。  相似文献