[Voyage en Italie : 1824-1830]. , Peintures à Pompeia : [un motif d'architecture feinte, avec deux angelots et un personnage masculin] : [dessin] / h. L. [Henri Labrouste]

Référence bibliographique : Weigert, 424

[Voyage en Italie : 1824-1830]. , [Détails de peintures décoratives] : [deux motifs d'architecture feinte et de détail d'une frise] : [dessin] / [Henri Labrouste]

Référence bibliographique : Weigert, 428

[Voyage en Italie : 1824-1830]. , [Détails de peintures décoratives] : [deux motifs d'architecture feinte et de détail d'un soubassement avec oiseau picorant des fruits] : [dessin] / [Henri Labrouste]

Référence bibliographique : Weigert, 429

[Ravenne. Éléments d'architecture]

Référence bibliographique : Weigert, 478

[Voyage en Italie : 1824-1830]. , [Détails ornementaux de la colonne Trajane] : [six motifs d'architecture] : [dessin] / [Henri Labrouste]

Référence bibliographique : Weigert, 505

Plant architecture of Paspalum vaginatum schwartz modified by nitrate and ammonium nutrition

Paspalum vaginatum Schwartz plants were grown under greenhouse conditions in a continuous-flow hydroponic culture, containing NO3- or NH4+or NH4NO3 as nitrogen source. After 30 days, the size of aerial biomass and root system decreased significantly when plants were supplied with NH4+as exclusive nitrogen source. Compared to NO3- treatment, reducing and non-reducing sugars were decreasing together with a significant increase in amino acids content. NH4+-nutrition caused tillers to grow toward an orthogravitropic position (average angle of 68° with respect to the horizontal), and with NO3--nutrition, tillers tended to become diagravitropic (average angle of 23°). With NH4NO3 all the parameters measured had values in between those of the other two sources. Thus, the morphologic differences among plants growing in NO3- or NH4+ nutrition confirm the hypothesis that nitrogen source determines the growth habit of tillers in P. vaginatum by modulating the endogenous levels of reducing-non-reducing sugars.

Social network architecture and the maintenance of deleterious cultural traits.

How have changes in communications technology affected the way that misinformation spreads through a population and persists? To what extent do differences in the architecture of social networks affect the spread of misinformation, relative to the rates and rules by which individuals transmit or eliminate different pieces of information (cultural traits)? Here, we use analytical models and individual-based simulations to study how a 'cultural load' of misinformation can be maintained in a population under a balance between social transmission and selective elimination of cultural traits with low intrinsic value. While considerable research has explored how network architecture affects percolation processes, we find that the relative rates at which individuals transmit or eliminate traits can have much more profound impacts on the cultural load than differences in network architecture. In particular, the cultural load is insensitive to correlations between an individual's network degree and rate of elimination when these quantities vary among individuals. Taken together, these results suggest that changes in communications technology may have influenced cultural evolution more strongly through changes in the amount of information flow, rather than the details of who is connected to whom.

Soils in an agricultural landscape of Jokioinen, south-western Finland

Selostus: Jokioisten seudun maannokset