@article{ParkKrauseKarnahletal.2018, author = {Park, Misoon and Krause, Cornelia and Karnahl, Matthias and Reichardt, Ilka and El Kasmi, Farid and Mayer, Ulrike and Stierhof, York-Dieter and Hiller, Ulrike and Strompen, Georg and Bayer, Martin and Kientz, Marika and Sato, Masa H. and Nishimura, Marc T. and Dangl, Jeffery L. and Sanderfoot, Anton A. and J{\"u}rgens, Gerd}, title = {Concerted Action of Evolutionarily Ancient and Novel SNARE Complexes in Flowering-Plant Cytokinesis}, series = {Developmental cell}, volume = {44}, journal = {Developmental cell}, number = {4}, publisher = {Cell Press}, address = {Cambridge}, issn = {1534-5807}, doi = {10.1016/j.devcel.2017.12.027}, pages = {500 -- +}, year = {2018}, abstract = {Membrane vesicles delivered to the cell-division plane fuse with one another to form the partitioning membrane during plant cytokinesis, starting in the cell center. In Arabidopsis, this requires SNARE complexes involving the cytokinesis-specific Qa-SNARE KNOLLE. However, cytokinesis still occurs in knolle mutant embryos, suggesting contributions from KNOLLE-independent SNARE complexes. Here we show that Qa-SNARE SYP132, having counterparts in lower plants, functionally overlaps with the flowering plant-specific KNOLLE. SYP132 mutation causes cytokinesis defects, knolle syp132 double mutants consist of only one or a few multi-nucleate cells, and SYP132 has the same SNARE partners as KNOLLE. SYP132 and KNOLLE also have non-overlapping functions in secretion and in cellularization of the embryo-nourishing endosperm resulting from double fertilization unique to flowering plants. Evolutionarily ancient non-specialized SNARE complexes originating in algae were thus amended by the appearance of cytokinesis-specific SNARE complexes, meeting the high demand for membrane-fusion capacity during endosperm cellularization in angiosperms.}, language = {en} } @article{YorkJacksonBrowneetal.2005, author = {York, T. and Jackson, N. and Browne, Ian W. A. and Wucknitz, Olaf and Skelton, J. E.}, title = {The Hubble constant from the gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys}, issn = {0035-8711}, year = {2005}, abstract = {We present deep optical observations of the gravitational lens system CLASS B0218 + 357, from which we derive an estimate for the Hubble constant (H-0). Extensive radio observations using the VLA, MERLIN, the VLBA and VLBI have reduced the degeneracies between H-0 and the mass model parameters in this lens to one involving only the position of the radio-quiet lensing galaxy with respect to the lensed images. B0218 + 357 has an image separation of only 334 mas, so optical observations have, up until now, been unable to resolve the lens galaxy from the bright lensed images. Using the new Advanced Camera for Surveys (ACS), installed on the Hubble Space Telescope in 2002, we have obtained deep optical images of the lens system and surrounding field. These observations have allowed us to determine the separation between the lens galaxy centre and the brightest image, and so estimate H-0. We find an optical galaxy position, and hence an H0 value, that varies depending on our approach to the spiral arms in B0218 + 357. If the most prominent spiral arms are left unmasked, we find H-0 = 70 +/- 5 km s(-1) Mpc(-1) (95 per cent confidence). If the spiral arms are masked out, we find H-0 = 61 +/- 7 km s(-1) Mpc(-1) (95 per cent confidence)}, language = {en} }