Meeting Abstract 20.4  Thursday, Jan. 3  Molecular Phylogenetic Evidence Clarifies Hydra�s Closest Relatives NAWROCKI, A.M.; University of Kansas, Lawrence nawrocki@ku.edu Knowledge of the phylogenetic position of model organisms provides a comparative framework for investigating the evolution of development. Hydra has been a key model organism for the study of developmental pathways; however, further insight into the evolution […]

Meeting Abstract 20.1  Thursday, Jan. 3  Genesis and expansion of metazoan transcription factor gene classes: insights from choanoflagellate, sponge, and cnidarian genomes LARROUX, C*; LUKE, GN; KOOPMAN, PK; SHIMELD, SM; DEGNAN, BM; University of Queensland; University of Reading; University of Queensland; University of Oxford; University of Queensland clarroux@sib.uq.edu.au The invention of a basic developmental program may have […]

Meeting Abstract 20.5  Thursday, Jan. 3  Beta-catenin regulates endoderm formation in a nemertean embryo HENRY, J.Q.*; MARTINDALE, M.Q.; PERRY, K.J.; WEVER, J.M.; University of Illinois, Urbana; University of Hawaii, Kewalo; University of Illinois, Urbana; University of Illinois, Urbana j-henry4@uiuc.edu The canonical Wnt signaling pathway regulates nuclear localization of beta-catenin and a diverse array of developmental processes including […]

Meeting Abstract 20.3  Sunday, Jan. 4  Study of Neuromechanical Control of Rhythmic Behaviors by Floquet Analysis REVZEN, S*; GUCKENHEIMER, J.M.; FULL, R.J.; Univ. of California, Berkeley CA; Cornell Univ., Ithaca NY; Univ. of California, Berkeley CA shrevz@berkeley.edu The control of rhythmic behaviors like locomotion is challenging to study when compared with control of fixed-point behaviors such as […]

Meeting Abstract 20.5  Sunday, Jan. 4  Similar motor pattern generators produce flexible walking behavior in juvenile and adult crayfish RINEHART, MD*; BELANGER, JH; West Virginia University; West Virginia University mrinehar@mix.wvu.edu We have shown previously that juvenile and adult crayfish (Procambarus clarkii) use different stepping patterns when freely walking. These differences are primarily due to an increase in […]

Meeting Abstract 20.1  Sunday, Jan. 4  Function of the epaxial muscles during trotting SCHILLING, N.*; CARRIER, D.R.; Friedrich-Schiller-University, Jena; University of Utah, Salt Lake City nadja.schilling@uni-jena.de In mammals, the epaxial muscles are believed to stabilize the trunk during walking and trotting because the timing of their activity is not appropriate to produce bending of the trunk. To […]

Meeting Abstract 20.4  Sunday, Jan. 4  Examining integration of new cells into neural circuits and the evolution of motor control. HALE, M. E. *; FREMONT, R. T.; Univ. Chicago; Albert Einstein College of Medicine mhale@uchicago.edu One of the fundamental questions in neuroscience is: How does the brain evolve? The brain and its neural circuits, populations of nerve […]

Meeting Abstract 20.2  Sunday, Jan. 4  Abdominal motor patterns in mammalian locomotion: hypaxial muscle function with and without epipubic bones REILLY, S.M.*; MCELROY, E.J.; WHITE, T.D.; Ohio University; College of Charleston; Buffalo State College reilly@ohio.edu Recently, we have shown in marsupials that 1) all of the hypaxial layers are involved in during ventilation and that each epipubic […]

Meeting Abstract 20.1  Monday, Jan. 4  Using trypsin digestion to determine the relative contributions of titin and collagen to passive elastic properties of whole muscles. POWERS, KL*; GILMORE, LA; MONROY, JA; UYENO, TA; NISHIKAWA, KC; Northern Arizona University Krysta.Powers@nau.edu Several elastic proteins contribute to spring properties of resting muscle, including the giant titin protein, located within muscle […]

Meeting Abstract 20.5  Monday, Jan. 4  Mechanical energy gradients arise as a consequence of temperature gradients in the flight muscles of Manduca sexta GEORGE, N.T.*; DANIEL, T.L.; Univ of Washington, Seattle; Univ of Washington, Seattle ntgeorge@u.washington.edu The inherent inefficiency of muscle contraction leads to significant heat production. Many insects use this energy byproduct to raise their thoracic […]