Long-chain bacterial polysaccharides have important roles in pathogenicity. In Escherichia coli O9a, a model for ABC transporter–dependent polysaccharide assembly, a large extracellular carbohydrate with a narrow size distribution is polymerized from monosaccharides by a complex of two proteins, WbdA (polymerase) and WbdD (terminating protein). Combining crystallography and small-angle X-ray scattering, we found that the C-terminal domain of WbdD contains an extended coiled-coil that physically separates WbdA from the catalytic domain of WbdD. The effects of insertions and deletions in the coiled-coil region were analyzed in vivo, revealing that polymer size is controlled by varying the length of the coiled-coil domain. Thus, the coiled-coil domain of WbdD functions as a molecular ruler that, along with WbdA:WbdD stoichiometry, controls the chain length of a model bacterial polysaccharide.

Mar 18, 2015. In the Budget parameters form, you must select a budget journal name for the budget appropriation before you can select this check box. For more information, see Budget parameters (form). Budget appropriations represent budget amounts on the balance sheet. They are used to record the estimated.

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OSA Publishing's Digital Archive products provide you and your patrons with perpetual access to a wide variety of ground breaking optics and photonics research published over the last 100 years. The OSA Centennial Archive package includes more than 256,000 journal and magazines articles as well as the conference proceedings from more than 670 meetings. In short, it includes the content published by OSA since the inception of its publishing program in 1917. Mto Laboratory Testing Manuals. The OSA Digital Archive 1 package includes access to content published between 1917 to 2005 and includes roughly 135,000 articles from OSA's core journals, magazine, and conference proceedings. The OSA Digital Archive 2 supplements the original OSA Digital Archive, by providing perpetual access to an additional 121,000 journal, magazine and conference proceeding articles published between 2006 and 2015. OSA now offers Individual Journal Archives for some of its journals. You can now purchase perpetual access to the archives of Applied Optics, Optics Letters, the Journal of the Optical Society of America A (JOSA A) or the Journal of the Optical Society of America B (JOSA B).

Purchasing one or more of these Individual Digital Archives ensures access to all the content in each journal from the first issue all the way to 2006. This chart provides a detailed view into the contents for the Digital Archive packages and Individual Journal Archives described above.