Showing 4861 - 4870 of 5713 Items
Examination of tooth-specific cis-regulation of the dlx2b gene during zebrafish development This record is embargoed.
- Embargo End Date: 2025-05-14
Date: 2020-01-01
Creator: Yujin Moon
Access: Embargoed
Dead end words in lamplighter groups and other wreath products
Date: 2005-09-22
Creator: Sean Cleary, Jennifer Taback
Access: Open access
- We explore the geometry of the Cayley graphs of the lamplighter groups and a wide range of wreath products. We show that these groups have dead end elements of arbitrary depth with respect to their natural generating sets. An element w in a group G with finite generating set X is a dead end element if no geodesic ray from the identity to w in the Cayley graph Γ(G, X) can be extended past w. Additionally, we describe some non-convex behaviour of paths between elements in these Cayley graphs and seesaw words, which are potential obstructions to these graphs satisfying the k-fellow traveller property. © The Author 2005. Published by Oxford University Press. All rights reserved.
Pectin activation of MAP kinase and gene expression is WAK2 dependent
Date: 2009-12-01
Creator: Bruce D. Kohorn, Susan Johansen, Akira Shishido, Tanya Todorova, Rhysly, Martinez, Elita Defeo, Pablo Obregon
Access: Open access
- The angiosperm extracellular matrix, or cell wall, is composed of a complex array of cellulose, hemicelluose, pectins and proteins, the modification and regulated synthesis of which are essential for cell growth and division. The wall associated kinases (WAKs) are receptor-like proteins that have an extracellular domain that bind pectins, the more flexible portion of the extracellular matrix, and are required for cell expansion as they have a role in regulating cellular solute concentrations. We show here that both recombinant WAK1 and WAK2 bind pectin in vitro. In protoplasts pectins activate, in a WAK2-dependent fashion, the transcription of vacuolar invertase, and a wak2 mutant alters the normal pectin regulation of mitogen-activated protein kinases. Microarray analysis shows that WAK2 is required for the pectin activation of numerous genes in protoplasts, many of which are involved in cell wall biogenesis. Thus, WAK2 plays a major role in signaling a diverse array of cellular events in response to pectin in the extracellular matrix. © 2009 Blackwell Publishing Ltd.
Photographs: John McKee
Date: 1973-01-01
Access: Open access
- "Catalogue published in conjunction with an exhibition held at the Bowdoin College Museum of Art, April 6-May 27, 1984"--T.p. verso
Winslows: Pilgrims, Patrons, and Portraits
Date: 1974-01-01
Access: Open access
- Catalogue from a joint exhibition at Bowdoin College Museum of Art and the Museum of Fine Arts, Boston. Includes biographical references.
pp-wave limits and orientifolds
Date: 2003-02-03
Creator: Stephen G. Naculich, Howard J. Schnitzer, Niclas Wyllard
Access: Open access
- We study the pp-wave limits of various elliptic models with orientifold planes and D7-branes, as well as the pp-wave limit of an orientifold of AdS5 × T11. Many of the limits contain both open and closed strings. We also present pp-wave limits of theories which give rise to a compact null direction and contain open strings. Maps between the string theory states and gauge theory operators are proposed. © 2002 Elsevier Science B.V. All rights reserved.
All Maine Biennial '79
Date: 1979-01-01
Access: Open access
- "Exhibition dates: July 27-September 16, 1979." "Supported by the Maine State Commission on the Arts and the Humanities."
Replacement of histidines of light harvesting chlorophyll a/b binding protein II disrupts chlorophyll-Protein complex assembly
Date: 1990-01-01
Creator: Bruce D. Kohorn
Access: Open access
- Eukaryotic light harvesting proteins (LHCPs) bind pigments and assemble into complexes (LHCs) that channel light energy into photosynthetic reaction centers. The structures of several prokaryotic LHCPs are known and histidines are important for the binding of the associated pigments. It has been difficult to predict how the eukaryotic LHCPs associate with pigments as the structure of the major LHCP of photosystem II is not yet known. While each LHCPII binds approximately 13 chlorophylls the protein contains only three histidines, one in each putative transmembrane helix. Experiments that use isolated pea (Pisum sativum L.) chloroplasts and mutant LHCPII synthesized in vitro show that the substitution of either an alanine or an arginine for each histidine residue inhibits some aspect of LHCII assembly. The histidine of the first membrane helix, but not the second or third, may be involved in the transport across the chloroplast envelope. No histidine alone is essential for the insertion of LHCP into thylakoid membranes, yet arginine substitutions are more inhibitory than those of alanine. The histidine replacements have their most pronounced effect on the assembly of LHCP into LHCII.
Calculating the Local Biotic Exchange Ratio of O2 and CO2 at Harvard Forest: Using Flux Measurements to Improve Past Estimates Access to this record is restricted to members of the Bowdoin community. Log in here to view.
- Restriction End Date: 2025-06-01
Date: 2020-01-01
Creator: Diana Katalina Grandas
Access: Access restricted to the Bowdoin Community