Salivary gland extracts (SGE) from unfed and 5 days led adult female Ixodes ricinus (Linnaeus, 1758); Haemaphysalis inermis (Birula, 1895) and Dermacentor reticulatus (Fabricius, 1794) ticks were prepared. The protein content after feeding increased by 10.6, 8.7 and 6.8 limes, respectively. Extracts were equilibrated to the same protein content and submitted to SDS-polyacrylamide gel electrophoresis followed by computer analysis of the scanned gels. Relative differences in protein profiles of extracts obtained from unfed and partially fed ticks were found in all species and some of them were similar in all three species used in the study. Results demonstrate that the increase of the protein content in salivary glands during the feeding does not occur proportionally. Some proteins are synthesised preferentially (67.1 kDa, 13.5 kDa) but other bands (in range of 15-16 kDa) present in the SGE derived from unfed ticks arc less discernible in that of fed ticks.
A new nematode species, Guyanema longispiculum sp. n. is described from the abdominal cavity of the freshwater armoured catfish, Loricariichthys hrunneus (Hancock), from two localities in western Venezuela. It differs from all hitherto known members of the genus in having unusually long spicules (0.480-0.609 mm) and from individual species also by other morphological and biometrical features. It is characterized by the presence of eight cephalic papillae arranged in two circlets, localization of deirids anterior to the nerve ring, a conical, undivided tip of the tail in both sexes, four pairs of preanal and six pairs of postanal papillae in the male, and a markedly elevated vulva in the female. A key to species of Guyanema is presented.
Může se umění přátelit s vědou? Anebo věda s uměním? Lze spojit tyto dva odlišné břehy, zbudovat mezi nimi pomyslný most? Na jednom z břehů půvab děl uměleckých, na straně druhé pak elegance základních kamenů hmoty. Zkusme tedy posoudit prolínání vědy s uměním optikou životního příběhu člověka, jenž z oblasti vědy přestoupil do světa "hereckého", aby namísto událostí vědeckých vyprávěl příběhy filmových a divadelních postav. Pozvání k rozhovoru přijal absolvent Matematicko-fyzikální fakulty, herec (a pro nás astronomy také nepřekonatelný prof. František Nušl, jehož ztvárnil v rámci oslav 100. výročí založení ČAS) a rovněž umělecký šéf Dejvického divadla Mgr. Martin Myšička. and Jana Žďárská.
A problem of start detector is very topical in laser radar station working with a train of pulses generating by mode locked Nd:YAG laser. This article deals with new developed start detector used in INTERCOSMOS laser radar station in Helwan, Egypt. A time resolution of the detector is better 150ps.