TY  - JOUR
A1  - Bykov, Andrei
A1  - Gehrels, Neil
A1  - Krawczynski, Henric
A1  - Lemoine, Martin
A1  - Pelletier, Guy
A1  - Pohl, Martin
T1  - Particle acceleration in relativistic outflows
JF  - Space science reviews
N2  - In this review we confront the current theoretical understanding of particle acceleration at relativistic outflows with recent observational results on various source classes thought to involve such outflows, e.g. gamma-ray bursts, active galactic nuclei, and pulsar wind nebulae. We highlight the possible contributions of these sources to ultra-high-energy cosmic rays.
KW  - Cosmic rays
KW  - Particle acceleration
KW  - Shocks
Y1  - 2012
U6  - https://doi.org/10.1007/s11214-012-9896-y
SN  - 0038-6308
VL  - 173
IS  - 1-4
SP  - 309
EP  - 339
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Powell, Anahid E.
A1  - Lenhard, Michael
T1  - Control of organ size in plants
JF  - Current biology
N2  - The size of plant organs, such as leaves and flowers, is determined by an interaction of genotype and environmental influences. Organ growth occurs through the two successive processes of cell proliferation followed by cell expansion. A number of genes influencing either or both of these processes and thus contributing to the control of final organ size have been identified in the last decade. Although the overall picture of the genetic regulation of organ size remains fragmentary, two transcription factor/microRNA-based genetic pathways are emerging in the control of cell proliferation. However, despite this progress, fundamental questions remain unanswered, such as the problem of how the size of a growing organ could be monitored to determine the appropriate time for terminating growth. While genetic analysis will undoubtedly continue to advance our knowledge about size control in plants, a deeper understanding of this and other basic questions will require including advanced live-imaging and mathematical modeling, as impressively demonstrated by some recent examples. This should ultimately allow the comparison of the mechanisms underlying size control in plants and in animals to extract common principles and lineage-specific solutions.
Y1  - 2012
U6  - https://doi.org/10.1016/j.cub.2012.02.010
SN  - 0960-9822
VL  - 22
IS  - 9
SP  - R360
EP  - R367
PB  - Cell Press
CY  - Cambridge
ER  -