The influence of female mating status on ovarian development of the ladybird, Propylea dissecta (Mulsant) (Coleoptera: Coccinellidae), was investigated under laboratory conditions. We assessed the extent to which ovariole development was affected by mating and for that we initially created a base line by observing age specific ovariole development. Results show that the number of follicles in each ovariole increased with the age of both virgin and mated females up to the age of 3 days, thereafter, no increase in number of follicles was recorded. Ovariole width also increased with age in both virgin and mated females up to 4 days, thereafter, no increase in ovariole width was recorded. The ovariole width of mated females was significantly greater than that of virgin females. Egg maturation and the egg load started to increase at the age of 8 days in virgin females. Thereafter, it increased with increase in female age. While in mated females, immature eggs were recorded in their ovarioles from the age of 1 to 2 days. In mated females, however, the increase in the number of mature eggs per ovariole and egg load started when they were 3 days old. Egg load continuously increased with increasing female age., Mhd Shahid, Arshi Siddiqui, Omkar, Geetanjali Mishra., and Obsahuje bibliografii
In vivo reflectance and fluorescence spectra from berry skins of a white (Riesling) and red (Cabernet Sauvignon) grapevine variety were measured during a ripening season with a new CMOS radiometer instrument. Classical reference measurements were also carried out for a sugar content of the berry juice [°Brix] and pigment contents (chlorophyll a and b, carotenoids, anthocyanins) from methanol extracts of the berry skin. We showed that the colours and the spectra analysed from them could be taken as an unambiguous indicator of grapevine ripening. Reflectance spectra, which were affected by the content of pigments (chlorophylls and anthocyanins), effects of surface (wax layers), and tissue structure (cell size) of the berries well correlated (R2 = 0.89) with the °Brix measurements of the berries. The fast data acquisition of both reflectance and fluorescence spectra in one sample with our radiometer instrument made it superior over the time-consuming, traditional, and mostly destructive chemical analysis used in
vine-growing management., M. Navrátil, C. Buschmann., and Obsahuje seznam literatury
Hypertenze závislá na soli patří mezi nejčastější rizikové faktory kardiovaskulárních onemocnění. U většiny případů je příčina tohoto onemocnění neznámá, avšak významný podíl hypertenzních jedinců citlivých k soli má zvýšené hladiny mineralokortikoidů. V tomto přehledném článku popisujeme hemodynamické abnormality a mechanismy odpovědné za vývin této formy hypertenze., Salt-dependent hypertension is a leading cause of cardiovascular diseases. In most cases, the etiology is unknown, but it has been estimated that a significant percentage of salt-sensitive hypertensive individuals have mineralocorticoid excess. In this review, we describe hemodynamic abnormalities and mechanisms responsible for initiation of this form of hypertension., and Michal Pravenec.
Bryophytes, with their more than 860 species, represent more than a quarter of higher plants native to the CR. They can reveal much more about the ecosystems they live in than we would expect, as their physiological contact with the surroundings is much closer than that of the vascular plants. and Jan Kučera.
Medúzka sladkovodní (Craspedacusta sowerbii) je jediným zástupcem rosolovitého zooplanktonu v našich vodách. Článek popisuje historii zkoumání, životní cyklus a ekologii tohoto u nás nepůvodního druhu, který byl do celého světa zavlečen z Číny., The Freshwater Jellyfish (Craspedacusta sowerbii) is the only representative of gelatinous zooplankton in Czech waters. This article describes the body of research on the invasive species, which has spread from China all over the world. The article also includes a description of the species´ life cycle and ecology., and Adam Petrusek.
Detailed knowledge of the circumstances behind the extermination of particular animal species is a key premise for their eventual return, reintroduction and ongoing preservation. Data on the presence of the Brown Bear (Ursus arctos) in the Czech landscape are usually limited to simple entries about the day and place where the last specimens in particular (usually mountainous) regions were slain. Demand for more precise data, especially regarding the last documented presence of bear cubs, has emerged in respect of the recently discovered ability of bears to migrate over long distances. The newly collected data allowed the author to present amuch more complete historical view of the process of extermination of the Brown Bear in the Czech territory. and Jan Andreska.
The prolonged survival of the Brown Bear (Ursus arctos) population in the Bohemian Forest was largely possible due to the protec tion of this animal, which was considered a rare and desirable trophy. Consequently the bear was able to survive in the Bohemian Forest for a hundred years longer than in the Ore Mountains. Isolated populations in the Sudetes survived in Moravia, and the last specimens were hunted down in the 1740s. Bears hunted down during the 19th century in the Beskydy Mts. can almost certainly be considered casual migrants from the Slovak part of this mountain range. The return of bears to the territory of Moravia and Silesia corresponds with the consolidation of the Slovak population due to the protection introduced in 1932. and Jan Andreska.
Large amounts of abandoned limestone quarries in the Bohemian Karst provide a great opportunity to study different stages of spontaneous succession simulta - neously. Molluscs are a suitable model group for this study –many land snail species including the rare ones occur in these quarries. Because of the large variability of habitats, quarries abandoned for around 60 years have higher species diversity. and Alena Kocurková, Lucie Juřičková.