The structure of the human microsporidium found by Yachnis and colleagues in two AIDS patients (Am. J. Clin. Pathol. 106: 535-43, 1996) (hereafter referred to as HMY) was investigated by light and transmission electron microscopy and compared with Thelohania apodemi Doby, Jeannes et Raoult, 1963, a microsporidian of small rodents. The fine structure of the HMY was found to be similar to that of Trachipleistophora hominis Hollister, Canning, Weidner, Field, Kench et Marriott, 1996. Characteristic is the presence of a thick layer of electron dense material on the outer lace of the meront plasmalemma, which is maintained during the whole life cycle and which later persists as an electron dense coat on the sporophorous vesicle (SPOV). However, HMY is distinguished from T. hominis during sporogony, as two types of SPOV and spores are formed in HMY. One type of SPOV contains thick-wallcd spores (usually 8 or more in number) with anisofilar polar filaments of 7 + 2 pattem, while the other type contains only two thin-walled spores with a smaller number (3-5) of isofilar polar filament coils. The HMY differs from T. apodemi which also forms SPOV with 8 spores inside, but the spores of which are larger in size and have 9 + 2 polar filament pattern.
The treatment of maize {Zea mays L.) seedlings (8-d-old) with 5 and 10 gM Cd^'*’ for 24 and 48 h caused a decrease in ffesh and dry mass, in the contents of chlorophylls and carotenoids, rates of net carbon dioxide uptake (Pyj) and transpiration (E), water use efficiency (Pyj/E = WUE) and stomatal conductance (gg).
Low temperature phosphorescence, fluorescence and transient hole buming spectra of the photosystem 2 particles isolated from the cyanobacterium Synechococcus elongatus were measured. The role of photosynthetic activity was estimated by comparison of these spectroscopic methods. A model explaining chlorophyll fluorescence changes and both phosphorescence quantum efficiency increase and transient hole bimiing efficiency decrease connected with Chemical or heat photosynthetic deactivation is presented.
Vysychání kapek a následné formování "kávových kroužků" představuje velice zajímavou fyziku z běžného života. V článku se však pustíme dále - do oblasti aplikací tohoto jevu - a ukážeme si, jak pomáhá koncentrovat biomolekuly, které jsou pak přístupné studiu Ramanovou spektroskopií. Položíme si otázku, jak se liší konformace biomolekul v "kávových kroužcích" od jiných fází, přidáme však i přehled dosavadních užití až po biomedicínské aplikace., Desiccation of droplets and subsequent formation of "coffee rings" represents very interesting physics in an ordinary life. in this article, we go further into the region of applications of this phenomenon and we show that it helps to concentrate biomolecules, which are then accessible to Raman spectroscopy. We address questions about the difference of conformation of biomolecules in "coffee rings" with respect to other phases, finally we give an overview of the present employment of this method as far as biomedical applications., Vladimír Kopecký Jr., and Obsahuje bibliografii