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Start Over Coverage 236-238

3. Alexandru Proca (16.10.1897 - 13.12.1955)

Creator:
Kraus, Ivo
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
Proca, Alexandre, 1897-1955, fyzika, dějiny, physics, 6, and 53
Language:
Czech and English
Description:
Několik příspěvků v tomto čísle cituje dílo A. Procy v souvislosti s problémem možné nenulové hmotnosti fotonu. Ukážeme zde, že dílo tohoto francouzského teoretického fyzika rumunského původu je mnohem rozsáhlejší. Byl skutečně významným a všestranným fyzikem., In this year we commemorate 60 years since the death of Alexandru Proca, one of the greatest physicists of the 20th century. He was a French scientist of Romanian origin. He developed the vector meson theory of nuclear forces and the relativistic quantum field equations which bear his name (Proca‘s equations) for the massive, vector spin-1 mesons., Ivo Kraus., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. First experimental observations on the development of Rhabdochona denudata (Nematoda: Rhabdochonidae) in the intermediate host

Creator:
Moravec, František
Format:
bez média and svazek
Type:
model:article and TEXT
Language:
English
Description:
Two species of mayfly nymphs, Habroleptoides modesta (Hagen) and Habrophlebia lauta (Eaton) (Ephemeroptera: Leptophlebiidae), were found as suitable experimental intermediate hosts of the fish nematode Rhabdochona denudata (Dujardin, 1845) (Rhabdochonidae), an intestinal parasite of Palaearctic cyprinids. The parasite's eggs were obtained from nematode gravid females parasitizing the European chub, Leuciscus cephalus (L.), of the Rokytná River, Czech Republic. At the water temperature of 9°C, the eggs of R. denudata were ingested by the intermediate host and the hatched, toothed (with a minute cephalic boring tooth) first-stage larvae about 200 µm long penetrated into the body cavity of the mayfly. There the larvae grew and moulted twice (on 16-18 and 30-35 days p.i.) before attaining the third stage, which is already infective for the fish definitive host. Infective larvae of this stage were about 1.5 mm long and their morphology resembled that of adults except for the vestibule structure; they became encapsulated as in those of other congeneric species.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Povlakovací PVD zařízení Pi111

Creator:
Vogl, Petr and Holubář, Pavel
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Pi111, coating equipment, PVD coatings, povlakovací zařízení, and PVD povlaky
Language:
Czech
Description:
Companies Pivot and Platit offer on the market PVD coating equipments using the principle of evaporation by the means of low voltage arc. Equipment type Pi80 has already been produced for 8 years and type Pi300 for more than 5 years. That is why a development of new generation of coating equipments, which use and will use similar principales of evaporation from rotating cathodes has started. The new equipments will however also bring new possibilities in technology, operation and equipment flexibility and of course also new possibilities in preparation of PVD coatings. The first equipment of the new generation was introduced at EMO´09 world exhibition in Milano at the beginning of October 2009. It was coating equipment Pi111, which is a dignified successor of the older Pi80 line. The specification and all advantages of the new equipment make the main content of this article. and Společnosti Pivot a Platit nabízí na trhu PVD povlakovací zařízení využívající princip odpařování pomocí nízkonapěťového oblouku. Zařízení typu Pi80 je vyráběno již 8 let a zařízení Pi300 více jak 5 let. Proto byl zahájen vývoj nových generací povlakovacích zařízení, která využívají a budou využívat podobné principy odpařování z rotačních katod. Nová zařízení ale také přinesou nové možnosti v technologii, obsluze a flexibilitě zařízení a samozřejmě i nové možnosti v přípravě PVD povlaků. První zařízení z této nové generace bylo představeno na světovém veletrhu EMO 2009 v Milánu počátkem října 2009. Jednalo se o zařízení Pi111, které je důstojným nástupcem starší řady Pi80. Specifikace a veškeré výhody tohoto nového zařízení jsou hlavní náplní článku.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

7. Reduction in virulence of Naegleriafowleri following growth with cholesterol

Creator:
John, D. T. and McCutchem, C. V.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Naegleria fowleri, virulence, and cholesterol
Language:
English
Description:
It has been reported that the virulence of axenically cultivated Entamoeba histolytica increases following growth with cholesterol. The purpose of this study was to determine whether cholesterol would enhance the virulence of axenically cultivated Naegleria fowleri. Amoebae were cultivated in axenic medium with (100 pg/ml) or without cholesterol for 6 months and tested in mice for changes in virulence. After 6 months of continuous cultivation, N. fowleri grown with cholesterol was less virulent for mice than the same strain grown without cholesterol.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

8. Za všechno mohou elektrony a reciproká mříž

Creator:
Valvoda, Václav
Format:
print
Type:
model:article and TEXT
Subject:
fyzika, physics, 6, and 53
Language:
Czech and English
Description:
Krátké zamyšlení nad souvislostí struktury krystalů a jejich vlastnostmi a nad fyzikálními a geometrickými principy difrakce rentgenového záření., The article contains a brief contemplation on the relationship between the structure and properties of crystals and on physical and geometrical principles of X-ray diffraction., Václav Valvoda., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public