Brněnští archeologové společně s velkým mezinárodním kolektivem analyzují na molekulární úrovni paleogenetický záznam z věstnonických a pavlovských lidských fosilií, jejichž stáří se odhaduje kolem 30 000 let. Zařazují je do kontextu dalších paleolitických nálezů z širšího období mezi 45-14 000 lety, a pokoušejí se tak načrtnout nové dějiny evropského paleolitu. Prakticky současně s články v prestižních časopisech Nature (Fu a kol. 2016) a Current Biology (Posth a kol. 2016) vydalo Nakladatelství Academia knihu Dolní Věstonice-Pavlov. Následující příspěvek je ukázkou z této publikace., Dolní Věstonice and Pavlov represent a complex of large hunters´ settlements of Upper Paleolithic age (about 30 000 years ago) with rich evidence of mammoth hunting, symbolic activities, and burials of early Homo sapiens. Actually, the Academia publishers edited a comprehensive book entitled Dolní Věstonice-Pavlov and published it almost simultaneously with two paleogenetic papers in Nature (Fu et al. 2016) and Current Biology (Posth et al. 2016) journals on paleogenetics of these human fossils., and Jiří Svoboda.
Large-scale excavations of complete Gravettian living-floors at Dolní Věstonice I were primarily realised between 1924-1952 whereas later fieldwork had rather a character of separate trenches. Here we report the results of last excavation organized at this site in 1990 and 1993. A series of trenches along the western and southern boundary brought additional chronostratigraphic and archaeological evidence concerning the overall situation of the site. In the lower part of the site we detected superimposed charcoal deposits dated by C14 to Early Gravettian but without artefactual context. In the uppermost part we identified the previously excavated units K2 and K3 and we show that these were discrete instalations dated to the Evolved Gravettian (Pavlovian). With the newly acquired data, this paper addresses the questions of general stratigraphy and local microstratigraphies, radiometric chronology, center-periphery relationships (on levels of the whole site and of the individual residential units), and structure of relevant faunal and lithic assemblages., Jiří Svoboda, Martin Novák, Sandra Sázelová, Šárka Hladilová, Petr Škrdla., and Obsahuje seznam literatury
The article focuses on changes in availability and use of childcare and pre-school facilities after the Second World War in the Czech society during different periods of communist regime and during the post-1989 era. It studies how they are embedded in context of women's participation on the labour market, gender roles, social policies, fertility rates, public debates on care and fears of population decline. Several discourses influencing the availability and use of childcare and pre-school facilities are identified in the history, e.g. ''the women's issue'' discourse supporting construction of nurseries since 1950s, ''the children's issue'' and ''the population'' discourses contributing to several prolongations of paid childcare leave since 1960s, etc. In history based institutional settings are identified as the main factors leading in a new labour market context to a current drop in availability of nurseries and an increase in care of pre-kindergarten children by mothers at home.
Progenitor cells of the human erythroid and granulocytic cell lineages are characterized by the presence of several nucleoli. One of these nucleoli is larger and possesses more fibrillar centres than others. Such nucleolus is apparently dominant in respect of both size and main nucleolar function such as nucleolar-ribosomal RNA transcription. Such nucleolus is also visible in specimens using conventional visualization procedures, in contrast to smaller nucleoli. In the terminal differentiation nucleated stages of the erythroid and granulocytic development, dominant nucleoli apparently disappeared, since these cells mostly contained very small nucleoli of a similar size with one fibrillar centre. Thus, the easily visible dominant nucleoli appear to be useful markers of the progenitor cell state, such as proliferation, and differentiation potential.
The domatic numbers of a graph $G$ and of its complement $\bar{G}$ were studied by J. E. Dunbar, T. W. Haynes and M. A. Henning. They suggested four open problems. We will solve the following ones: Characterize bipartite graphs $G$ having $d(G) = d(\bar{G})$. Further, we will present a partial solution to the problem: Is it true that if $G$ is a graph satisfying $d(G) = d(\bar{G})$, then $\gamma (G) = \gamma (\bar{G})$? Finally, we prove an existence theorem concerning the total domatic number of a graph and of its complement.
Generalized Petersen graphs are certain graphs consisting of one quadratic factor. For these graphs some numerical invariants concerning the domination are studied, namely the domatic number $d(G)$, the total domatic number $d_t(G)$ and the $k$-ply domatic number $d^k(G)$ for $k=2$ and $k=3$. Some exact values and some inequalities are stated.
For any graph G, let V (G) and E(G) denote the vertex set and the edge set of G respectively. The Boolean function graph B(G, L(G), NINC) of G is a graph with vertex set V (G) ∪ E(G) and two vertices in B(G, L(G), NINC) are adjacent if and only if they correspond to two adjacent vertices of G, two adjacent edges of G or to a vertex and an edge not incident to it in G. For brevity, this graph is denoted by B1(G). In this paper, we determine domination number, independent, connected, total, cycle, point-set, restrained, split and non-split domination numbers of B1(G) and obtain bounds for the above numbers.