Showing 3531 - 3540 of 5708 Items
The cell wall-associated kinases, WAKs, as pectin receptors
Date: 2012-05-08
Creator: Bruce D. Kohorn, Susan L. Kohorn
Access: Open access
- The wall-associated kinases, WAKs, are encoded by five highly similar genes clustered in a 30-kb locus in Arabidopsis. These receptor-like proteins contain a cytoplasmic serine threonine kinase, a transmembrane domain, and a less conserved region that is bound to the cell wall and contains a series of epidermal growth factor repeats. Evidence is emerging that WAKs serve as pectin receptors, for both short oligogalacturonic acid fragments generated during pathogen exposure or wounding, and for longer pectins resident in native cell walls. This ability to bind and respond to several types of pectins correlates with a demonstrated role for WAKs in both the pathogen response and cell expansion during plant development. © 2012 Kohorn and Kohorn.
A cascading N = 1 Sp(2N + 2M) × Sp(2N) gauge theory
Date: 2002-08-26
Creator: Stephen G. Naculich, Howard J. Schnitzer, Niclas Wyllard
Access: Open access
- We study the N=1 Sp(2N + 2M) × Sp(2N) cascading gauge theory on a stack of N physical and M fractional (half) D3-branes at the singularity of an orientifolded conifold. In addition to the D3-branes and an O7-plane, the background contains eight D7-branes, which give rise to matter in the fundamental representation of the gauge group. The moduli space of the gauge theory is analyzed and its structure is related to the brane configurations in the dual type IIB theory and in type IIA/M-theory. © 2002 Elsevier Science B.V. All rights reserved.
Torture under the Regime of Bashar al-Assad: Two Decades of Failed Human Rights Campaigns and Foreign Interference in Syria
Date: 2020-01-01
Creator: Olivia Giles
Access: Open access
- This honors thesis analyzes human rights campaigns to end the practice of state-sponsored torture in Syria during the presidency of Bashar al-Assad. It compares the 2000 Damascus Spring and the 2011 Arab Spring using the concept of the “contentious spiral model.” The model is based on the elements of the original “spiral model” introduced in The Power of Human Rights (1999) and the factors of contentious politics discussed in Dynamics of Contention (2001). It suggests that human rights movements that emerge from uprisings need effective mobilization by domestic and international actors. Sustained pressure from both sources should gradually force the state to make concessions until there is an absence of human rights violations. The study uses research on social movements and international politics in Syria, in addition to data on the practice of torture, to suggest that human rights campaigns to end state-sponsored torture in Syria have been unsuccessful because of the interference of Assad’s foreign alliances. These countries have helped the regime backlash against the opposition during uprisings, which has led to the fracturing of the movement. During the Damascus Spring, this interference took the form of shifting the world’s focus to other regional issues, and during the Arab Spring, Syria’s allies directly supported the Assad regime militarily, financially, and legally.
The large-scale geometry of some metabelian groups
Date: 2003-01-01
Creator: Jennifer Taback, Kevin Whyte
Access: Open access
One-instanton predictions of Seiberg-Witten curves for product groups
Date: 1999-01-01
Creator: Isabel P. Ennes, Stephen G. Naculich, Henric Rhedin, Howard J. Schnitzer
Access: Open access
- One-instanton predictions for the prepotential are obtained from the Seiberg-Witten curve for the Coulomb branch of script N sign = 2 supersymmetric gauge theory for the product group IIn=1m SU(Nn) with a massless matter hypermultiplet in the bifundamental representation (Nn,N̄n+1) of SU(Nn) × SU(Nn+1) for n = 1 to m - 1, together with N0 and Nm+1 matter hypermultiplets in the fundamental representations of SU(N1) and SU(Nm) respectively. The derivation uses a generalization of the systematic perturbation expansion about a hyperelliptic curve developed by us in earlier work. © 1999 Published by Elsevier Science B.V. All rights reserved.
Nonprophets: a novel This record is embargoed.
- Embargo End Date: 2025-05-14
Date: 2020-01-01
Creator: Nathan Osiason Blum
Access: Embargoed
Tame combing and almost convexity conditions
Date: 2011-12-01
Creator: Sean Cleary, Susan Hermiller, Melanie Stein, Jennifer Taback
Access: Open access
- We give the first examples of groups which admit a tame combing with linear radial tameness function with respect to any choice of finite presentation, but which are not minimally almost convex on a standard generating set. Namely, we explicitly construct such combings for Thompson's group F and the Baumslag-Solitar groups BS(1, p) with p ≥ 3. In order to make this construction for Thompson's group F, we significantly expand the understanding of the Cayley complex of this group with respect to the standard finite presentation. In particular we describe a quasigeodesic set of normal forms and combinatorially classify the arrangements of 2-cells adjacent to edges that do not lie on normal form paths. © 2010 Springer-Verlag.