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Microanatomy and cytogenetics of non-marine ostracods-an insight into evolutionary biology of their reproductive modes
Symonová, Radka ; Smrž, Jaroslav (advisor) ; Keyser, Dietmar (referee) ; Weyda, František (referee)
SUMMARYOF THEPh.D.THESIS The main objectivesof this dissertationwere to contributeto generarunderstandingand to fill some major gaps in our knowledgeof ostracodbiology.Ostracodsareotherwisea very well exploredgroup of crusta-cea :f ff:#'1"'';i,:T*"ortneirooosfil;I"TilffJ:,X'H::':;:: reconstructions,tn,..Lll?,1',i#r:T::il ff: "t"" usedinpataeoecorogicar knownabouthepatopancreasandnothins "oor,,Jl1ll,f"filH, ]i:.ffil:Further,there is no properdescriptionof the com ;':il'i:?l,Tll;l':*'*'ornsemnaton*":fflilli::fi:ff H*::: onryavairabledata on ,lxisted concerningthe karyologyof freshwaterostracods.rhe with exceptionssome 'eshwater ostracodkaryologycamefrom the i930s to 1950s *#jli:.:.,:ru$"::lt:_,:ri::1,i:iJ.["::.13[*:Nonetheress,tn"r"n,nn,lTi"""t"t"iffil]ogenetic remaleshadbeen*,*o "*.contextortheirreproduJtivemodesremaine;-;il::*o:nfoTl.."l';n";;u"''",n"For these reasons, ostracod microanatomyand cytogeneticsin rerationto theevotutionarybiologyof theirreproductiu",o0". *"of this thesis.Moreouer,other topicsreratedto ,n",'t" 'nu"tt'n"ted in the framework also taken into account. -r;J;._:::,:: tn"'t reproductionbiorogyhad been manipu,atorsinoucinsparililj:"gnJfl:ffi:nTffi:i1"J:fi#["il:obtainedby microscopicanatysisof the FRO in liduring holotomographic Investigation of cretac tng animals has been utilized...
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Storage cells and their role in tardigrade physiology.
Czerneková, Michaela ; Svoboda, Petr (advisor) ; Delagoutte, Emmanuelle (referee) ; Weyda, František (referee)
STORAGE CELLS AND THEIR ROLE IN TARDIGRADE PHYSIOLOGY Abstract Tardigrades possess remarkable tolerance to numerous stress conditions (e.g. almost complete desiccation, exposure to very low sub-zero temperature, heat stress and even exposure to space in low Earth orbit). Indeed, they are among the most radiation-resistant multi-cellular organisms. The body cavity of tardigrades is filled with the storage cells (SC). Their role in anhydrobiosis has been discussed. The main objectives of this work were to analyse (i) the occurrence of mitosis in SC, (ii) the factors constraining anhydrobiotic survival, and (iii) the general ultrastructure of SC and their ultrastructure concerning the stress conditions. Our model species, R. cf. coronifer is one of the most extensively studied tardigrades concerning anhydrobiosis. Comprehensive histochemical techniques were used in combination with SEM, TEM, and confocal microscopy. First, mitotic divisions of tardigrade SC occur with a higher frequency in juveniles than in adults and correlate with animal growth. Mitosis is more frequent in moulting tardigrades, but the overall mitotic index is low. Furthermore, tardigrades of R. cf. coronifer can survive the maximum of 6 repeated desiccation cycles with significantly declining survival rate with repeated desiccations and...
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Microanatomy and cytogenetics of non-marine ostracods-an insight into evolutionary biology of their reproductive modes
Symonová, Radka ; Smrž, Jaroslav (advisor) ; Keyser, Dietmar (referee) ; Weyda, František (referee)
SUMMARYOF THEPh.D.THESIS The main objectivesof this dissertationwere to contributeto generarunderstandingand to fill some major gaps in our knowledgeof ostracodbiology.Ostracodsareotherwisea very well exploredgroup of crusta-cea :f ff:#'1"'';i,:T*"ortneirooosfil;I"TilffJ:,X'H::':;:: reconstructions,tn,..Lll?,1',i#r:T::il ff: "t"" usedinpataeoecorogicar knownabouthepatopancreasandnothins "oor,,Jl1ll,f"filH, ]i:.ffil:Further,there is no properdescriptionof the com ;':il'i:?l,Tll;l':*'*'ornsemnaton*":fflilli::fi:ff H*::: onryavairabledata on ,lxisted concerningthe karyologyof freshwaterostracods.rhe with exceptionssome 'eshwater ostracodkaryologycamefrom the i930s to 1950s *#jli:.:.,:ru$"::lt:_,:ri::1,i:iJ.["::.13[*:Nonetheress,tn"r"n,nn,lTi"""t"t"iffil]ogenetic remaleshadbeen*,*o "*.contextortheirreproduJtivemodesremaine;-;il::*o:nfoTl.."l';n";;u"''",n"For these reasons, ostracod microanatomyand cytogeneticsin rerationto theevotutionarybiologyof theirreproductiu",o0". *"of this thesis.Moreouer,other topicsreratedto ,n",'t" 'nu"tt'n"ted in the framework also taken into account. -r;J;._:::,:: tn"'t reproductionbiorogyhad been manipu,atorsinoucinsparililj:"gnJfl:ffi:nTffi:i1"J:fi#["il:obtainedby microscopicanatysisof the FRO in liduring holotomographic Investigation of cretac tng animals has been utilized...
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Use of consumer digital camera Casio Exilim Pro EX-F1 in biology
Weyda, František
Digital camera Casio Exilim Pro EX-F1 is interesting tool in hands of biologist. For example biologist working in the field and taking photographs of quick animals to a longer distance. Iz is advantageous also for macrophotography. In fact it is „Scientific digital camera“ This model is able to shot very quick processes. It operates at frequency till 1200 fps. It is proof that due to electronics digital photography overpass limits characteristic for classical photography. The same will be in the near future.
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Infrared digital photography in biology
Weyda, František
Infrared digital photography has new possibilities especially with use of recent digital cameras. Their chip has higher sensitivity to near infrared light (N-IR). Due to this fact digital cameras are more universal than classical camera. Powerful electronics also helps. Digital photography in visible light as well as in UV and N-IR light are more and more applied in biological laboratory or in outdoor investigation.
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