National Repository of Grey Literature 155 records found  beginprevious143 - 152next  jump to record: Search took 0.01 seconds. 
The archeobotanical research of the Early Modern waterlogged cesspit in Prague-Celetná street and possibilities of photography documentation
IRMIŠOVÁ, Jitka
Based on the macroremains analysis from Early Modern waste filling of the well in Prague Celetná street, dietary habits of Prague dwellers and the character of the city environment from the second quarter of the 18th century to the early 20th century were constructed. In total 44 015 macroremains were found, of which only 2 707 diasporas were wild-growing species. Strong predominance of crop confirmed hypothesis of well-into-cesspit transformation at the end of the 18th century. The species such as Nicotiana rustica, Piper nigrum and Ocimum basilicum, not commonly occurring in the archeological objects were recorded. The changes of the diaspora external structure influenced by their long-term deposition under anaerobic conditions were examined by electron microscopy method. A difference in subtle damage to the distinct diaspora structure along with the rate of diaspora organic pollution was noted.
Potential uses of the low voltage transmission electron microscope LVEM 5 for the identification of viruses.
BIELNIKOVÁ, Hana
The aim of this study was to define and examin the capabilities of the low voltage transmission electron microscope LVEM 5 in the detection and identification of viruses, taking into consideration various contrasting agents, and a comparison to data from HV TEM.
Electron microscopic studies of photosynthetic membranes and their pigment-protein complexes
GARDIAN, Zdenko
The overall structure of photosynthetic pigment-protein complexes and thylakoid membranes of various photosynthetic organisms was studied using electron microscopy.
Physical principles of transmission and scanning electron microscopy
BÍLÝ, Tomáš
This bachelor thesis focuses on the description of transmission and scanning electron microscopy. It describes physical principles and defects arising during image formation in electron microscopes as well as the methodology of adjustment. The basic parts of electron microscopes are looked into more closely herein with consideration to the lectures. Practical implementation is demonstrated on following microscopes JEOL: JEM-1010, JSM-7401F, JDM-6300.
Collection solid angle of backscattered electrons in environmental scanning electron microscopy
Wandrol, Petr
This paper deals with an influence of the collection solid angle on a magnitude of detected signal. The presented results of measurement were gained by an observation of the specimen of carbon covered with a thin layer of gold. The collection solid angle was changed by application of aluminium masks mounted on the scintillator. As a working environment in the specimen chamber air and saturated water steam were used.
Observation of biological material in low voltage transmission electron microscope
Vancová, Marie ; Nebesářová, Jana
Different methods of specimen preparation for low voltage transmission electron microscopy (LVEM) were evaluated. The contrast of the image in LVEM, contrary to high voltage TEM, is strongly influenced by the thickness of the specimen. The resin embedding media used and the process of sectioning employed contributed to image quality and resolution.
Comparison of the cell structure of tissues prepared by different methods for transmission electron microscopy
Vancová, Marie ; Nebesářová, Jana
The aim of this work is to show how methods which are able to retain antigenicity of tissues can influence the structural appearance of the specimen. We compared the ultrastructure of tissues conventionally embedded in hydrophobic epoxides, with tissues embedded in hydrophilic acrylic resins (polymerized by heat or UV light) and cryo-sections.
The first experience with the specimen preparation for low-voltage transmission electron microscope
Nebesářová, Jana ; Vancová, Marie
The low-voltage transmission electron microscope, working in the TEM mode, requires ultrathin sections with a thickness 20-30nm. This demand brings problems with a section cohesion caused by insufficient resin infiltration and with a chatter caused by unequal thickness of the section. The contrast of unstained biological specimens in LV TEM is comparable with the contrast obtained in HV TEM of stained specimens.
Electron microscopical study of embryonic envelopes in the tapeworm Proteocephalus torulosus (Cestoda: Proteocephalidea)
Bruňanská, Magdaléna ; Nebesářová, Jana ; Scholz, Tomáš
The ultrastructure of the embryonic envelopes of the cestode Proteocephalus torulosus (Batsch, 1786), a parasite of cyprinid fish, was examined by transmission electron microscopy.
The importance of fixation procedures for transmission electron microscopy of haemocytes of Pyrrhocoris apterus
Slavíčková, K. ; Berger, Josef ; Nebesářová, Jana ; Němec, Václav
The importance of fixation procedures for transmission electron microscopy of haemocytes of Pyrrhocoris apterus.

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