@article{erken_ulker_2007, title={Effect of cyclic loading on monotonic shear strength of fine-grained soils}, volume={89}, ISSN={["0013-7952"]}, DOI={10.1016/j.enggeo.2006.10.008}, abstractNote={In this study the effect of cyclic loads on monotonic shear strength has been studied on torsional apparatus. Tests have been conducted on both reconstituted and undisturbed fine-grained hollow soil specimens. The plasticity index of soils is in the range from 2 to 33 for reconstituted specimens, prepared by dry pluviation, and from 5 to 13 for undisturbed soil specimens. The existence of a critical shear strain level, called yield shear strain, where softening starts, is determined from cyclic tests. The level of cyclic yield strain is ± 0.75% for the reconstituted soil specimens and ± 0.5% for the undisturbed soils. If soil undergoes a cyclic shear strain level below the cyclic yield strain, reduction of monotonic strength of reconstituted and undisturbed specimens is limited, but when cyclic shear strain level is larger than yield strain monotonic strength decreases down to 40% of its initial strength.}, number={3-4}, journal={ENGINEERING GEOLOGY}, author={Erken, Ayfer and Ulker, B. M. Can}, year={2007}, month={Feb}, pages={243–257} }
 @article{ascenzi_ulker_todd_sowinski_schimeneck_allen_weissinger_thompson_2003, title={Analysis of trans-silencing interactions using transcriptional silencers of varying strength and targets with and without flanking nuclear matrix attachment regions}, volume={12}, ISSN={["1573-9368"]}, DOI={10.1023/A:1023310118231}, abstractNote={We investigated the effect of the Rb7 matrix attachment region (MAR) on trans-silencing in tobacco plants, comparing the effects of three transgene silencer loci on ten target loci. Two of the silencer loci, C40 and C190, contain complex and rearranged transgene arrays consisting of 35S:GUS or NOS:NPTII containing plasmids. The third silencer locus, V271, was previously characterized as a complex locus containing rearranged 35S:RiN sequences. Each of these silencers can reduce 35S promoter-driven expression at other loci, albeit with varying efficiencies. The presence of MARs at a target locus does not prevent trans-silencing by the V271 silencer. However, four of seven MAR-containing loci were at least partially resistant to silencing by the C40 and C190 loci. One MAR locus was unaffected by C40, our weakest silencer, and three were silenced only when the silencer locus was maternally inherited. Silencing is progressive in the F1 and F2 generations; two days after germination there is little or no difference between seedlings derived from crosses to silencing or control lines, but seedlings containing silencer loci slowly lose expression during subsequent development. These observations are compatible with the hypothesis that a product of the silencer locus must accumulate before unlinked loci can be affected. However, our silencer loci are themselves silenced for GUS transcription, and coding region homology is not required for their effects on target loci. Our results are consistent with a model in which transcriptional silencing is triggered by transcription of sequences during the early stages of embryo or seedling development.}, number={3}, journal={TRANSGENIC RESEARCH}, author={Ascenzi, R and Ulker, B and Todd, JJ and Sowinski, DA and Schimeneck, CR and Allen, GC and Weissinger, AK and Thompson, WF}, year={2003}, month={Jun}, pages={305–318} }
 @article{ulker_weissinger_spiker_2002, title={E-coli chromosomal DNA in a transgene locus created by microprojectile bombardment in tobacco}, volume={11}, ISSN={["0962-8819"]}, DOI={10.1023/A:1015614220200}, number={3}, journal={TRANSGENIC RESEARCH}, author={Ulker, B and Weissinger, AK and Spiker, S}, year={2002}, month={Jun}, pages={311–313} }