Successful Goal Attainment: Longitudinal Effects of Goal Commitment and Implicit Motives Among German and Zambian Adolescents.

Goal commitment typically relates to successful goal realization. Yet, individuals differ in how much their goals correspond to their implicit motives. We hypothesized that for those adolescents high in a given implicit motive, goal commitment and goal success in the corresponding motive domain (i.e., achievement, affiliation, power) are more closely related than for those low in the implicit motive. Data were assessed in an individualistic (Germany) and a collectivistic cultural context (Zambia) on two measurement occasions (i.e., T1: Picture Story Exercise for implicit motives; T1 and T2: GOALS questionnaire for goal commitment and success, respectively). Goal success at T2 was reliably predicted by goal importance and goal success at T1, respectively. The hypothesized interaction was found only for the implicit power motive but not for the implicit needs of achievement and affiliation, respectively. Results were equivalent across adolescents' cultural backgrounds. Findings are discussed with respect to motive-specific effects on goal dimensions.

Motive-Driven Interpersonal Identity Development: Moderating Effects of Perceived Parenting Quality and Sense of Self-Determination.

Living and acting in line with one's implicit motives fosters peoples' well-being across a wide array of cultural contexts. Yet, not all individuals commit to goals that reflect their implicit motives. Research points to resources that relate to congruence of implicit and explicit motives. We hypothesized that such resources also relate to motive-congruent identity development. In detail, we assumed that perceived parenting quality (Study 1) and sense of self-determination (Study 2) moderate the relationship between the implicit need for affiliation and dimensions of identity development in the interpersonal domain of friendship. Evidence supporting our assumptions was found in both studies: Among adolescents who reported low levels of parenting quality higher levels of the implicit affiliation motive were associated with lower levels of commitment and higher levels of reconsideration of commitment (Study 1). Moreover, a positive association between the implicit affiliation motive and commitment was verified for adolescents who were high in self-determination (Study 2). Less straightforward findings on in-depth exploration point to the Janus-faced nature of exploration processes. To conclude, the implicit need for affiliation seems to play a crucial role in interpersonal identity development if particular social and personal resources are available. Implications for future research are discussed.

Signalling molecules and growth factors for tissue engineering of cartilage-what can we learn from the growth plate?

Modern tissue engineering concepts integrate cells, scaffolds, signalling molecules and growth factors. For the purposes of regenerative medicine, fetal development is of great interest because it is widely accepted that regeneration recapitulates in part developmental processes. In tissue engineering of cartilage the growth plate of the long bone represents an interesting, well-organized developmental structure with a spatial distribution of chondrocytes in different proliferation and differentiation stages, embedded in a scaffold of extracellular matrix components. The proliferation and differentiation of these chondrocytes is regulated by various hormonal and paracrine factors. Thus, members of the TGFbeta superfamily, the parathyroid hormone-related peptide-Indian hedgehog loop and a number of transcription factors, such as Sox and Runx, are involved in the regulation of chondrocyte proliferation and differentiation. Furthermore, adhesion molecules, homeobox genes, metalloproteinases and prostaglandins play a role in the complex regulation mechanisms. The present paper summarizes the morphological organization of the growth plate and provides a short but not exhaustive overview of the regulation of growth plate development, giving interesting insights for tissue engineering of cartilage.