|
|
Respiration of zooplankton in eutrophic ponds
LENDLEROVÁ, Lucie
Respiration in ponds recycles organic carbon arising from photosynthesis back to inorganic carbon. Zooplankton is most important in the process of respiration in the pond. Prior to this transformation, the organic carbon is potentially available to support secondary production. The efficiency of primary and secondary production relative to respiration is an important feature of ponds and other aquatic ecosystems. Intensive respiration in sediments often leads to oxygen depletion and even anoxia. Thus, the rates and controls of respiration are of central importance in pond ecosys-tems. The results show that zooplankton respiration make 60% or more of system respiration in the spring stage of clean water. There may be situations when it is pos-sible increase of benthic filamentous algae thanks to high transparency. Their photo-synthetic assimilation effectively balances oxygen deficit caused by zooplankton respiration and not occur dangerous deficit situations for fish which are usual in this period.
|
|
| |
|
|
Relation between plants and atmosphere in the current education of Science on the second stage of basic schools
ČEKAL, Tomáš
This bachelor thesis focuses on the relation between plants and atmosphere in the current education of Science on the second stage of basic schools. The thesis is divided into two main parts, a theoretical and a practical one. The theoretical part analyses an issue of three spheres which are furthermore observed in this bachelor thesis, namely: 1 Plants in relation to carbon cycle, 2 Influence of the atmosphere on plants, 3 Significance of plants for the atmosphere. The practical part consists of monitoring of the presence of separate spheres in the basic school textbooks (with the help of charts) and analysis of the 9th grade basic school pupils' knowledge in these spheres carried into effect based on the didactic test. The monitoring is worked up in the form of diagrams.
|
|
| |
|
| |
|
| |
|
| |
|
|
Imaging of fluorescence emission signals from healthy and infected leaf tissues
BENEDIKTYOVÁ, Zuzana
Auto-fluorescence emission of plant tissues can be a powerful reporter on plant biochemistry and physiology since it originates in substances inherent to primary or secondary metabolism. Plant bodies contain a plethora of intrinsic fluorescent compounds emitting practically all wavelengths of visible light. Moreover, the spectrum of fluorescent reporter signals was recently extended by a variety of fluorescent proteins that provide a new tool to mark whole cells or sub-cellular structures, study protein localization and monitor gene expression and molecule interactions. The imaging of such fluorescence signals reveals a possibility to acquire the information from as many as millions of points simultaneously, in vivo and in a non-invasive way thereby preserving integrity of cells and whole organisms. Imaging is particularly suited to visualize heterogeneity such as a localized immune response to invading pathogens. It can be applied both at macro- as well as micro-scales in two and three dimensions. The recent advancement in microscopy, the multi-photon microscopy, has made possible to monitor fluorescence signals, such as NAD(P)H fluorescence from intact leaf interior, that have been hidden to single-photon techniques.
|
|
| |
|
|
Effect of mineral fertilization on photosynthetic characteristics of Carex acuta
LESKOVCOVÁ, Martina
The MSc. thesis "Effect of mineral fertilization on photosynthetic characteristics of Carex acuta" deals with photosynthetic characteristics of plants subjected to different nutrient regimes. Stands dominated with Carex acuta were studied din two localities: Záblatské louky with organic soil and Hamr with mineral soil. The experimental treament was subjected to high fertilization, while the control treatment received no nutrient addition. The net assimilation was measured using Licor 6400. The aim was to find out whether the net assimilation was higher in fertilized plants as compared with non-fertilized plants. In spring the fertilized plants did not have higher photosynthetic rates at either locality, probably because of water limitation. The positive effect of fertilization was proved only at Hamerské louky after the second cut.
|
guest ::
