Is the writing on the wall for tabletops?

We describe an ethnographic study that explores how low tech and new tech surfaces support participation and collaboration during a workshop breakout session. The low tech surfaces were post-it notes and large sheets of paper. The new tech surfaces were writeable walls and a multi-touch tabletop. Four groups used the different surfaces during three phases: i) brief presentation of position papers and discussion of themes, ii) the creation of a group presentation and iii) a report back session. Participation and collaboration varied depending on the physical, technological and social factors at play when using the different surfaces. We discuss why this is the case, noting how new shareable surfaces may need to be constrained to invite participation in ways that are simply taken for granted because of their familiarity when using low tech materials

ENRAIZAMENTO DE CRAVO (Dianthus caryophyllus L.) IN VITRO E EX VITRO

Plântulas de cravo (Dianthus caryophyllus) micropropagadas durante várias gerações pelo período de um ano, foram enraizadas in vitro com AIA, ANA e AIB nas concentrações de 0,0; 0,25; 0,5 e 1,0 mg/l, em fatorial do tipo 3 x 4, com todos os tratamentos promovendo a formação de raízes, mas não diferindo do controle. Foi confrontado em condição autotrófica, o desempenho entre plântulas enraizadas in vitro na presença e ausência do regulador AIA 0,5 mg/l e plântulas enraizadas ex vitro, sem nenhuma diferença quanto ao comprimento da parte aérea. Para a variável produção de massa de matéria seca os melhores resultados foram proporcionados pelas plantas que passaram pela fase de enraizamento in vitro, tendo o sistema radicular efeito sinergístico no crescimento da parte aérea.<br>Plantlets of carnation (Dianthus caryophyllus L.) micropropagated through several generations during one year, were observed with respect to rooting in vitro, in the presence of IAA , NAA and IBA, at the following concentrations: 0,0; 0,25; 0,5 and 1,0 mg/l. All treatments promoted root formation, however no differences were detected in comparison to control. As far as the lenght of the aerial part is concerned no difference was observed between in vitro rooting. in the presence or absence of IAA 0,5 mg/l, and ex vitro rooting. Plantlets which were rooted in vitro conditions showed higher production of fresh matter then those rooted ex vitro. The root system had a synergistic effect on the growth of the aerial part