The price of samarium, crucial to high-temperature military applications like missile guidance motors, has more than tripled since July, to $32 a pound, Mr. Green said.
Motor neurons represent an attractive system in which to study axonal growth and guidance because motor axons generally grow over great distances along highly stereotyped pathways.
We used the developing mouse diaphragm as a model for assessing axonal guidance, where motor axons first reach the diaphragm between E11 12, but continue to branch and respond to guidance cues up to E15, when the mature innervation pattern is reached [40], [41].
Alcam is a member of the immunoglobulin superfamily which has a specific role in the guidance of motor axons and formation of neuromuscular junctions (NMJs) [ 50].
In the Drosophila embryo gyc76C is required for semaphorin-1a-plexin A-mediated repulsive guidance of motor axons (Ayoob et al., 2004).
Interestingly, vertebrate Ret has been shown to cooperate with Ephrins to ensure high fidelity axon guidance in motor neurons by mediating attractive EphrinA reverse signaling (Kramer et al., 2006; Bonanomi et al., 2012).
In contrast, gene knockout of DGN-1 in C. elegans results not in a muscle phenotype, but in severe disorganization of the somatic gonad epithelium, defects in vulval and excretory cell epithelia, and impaired axon guidance of motor neurons (Johnson et al., 2006; Johnson and Kramer, 2012).
Finally, it is unclear whether AChRs can themselves signal for purposes of synapse formation and/or guidance of growing motor nerves.
Chemically conjugated catalase triggers the decomposition of H2O2 to produce driving force by bubble propulsion, while a metallic (Ni) coating layer allows for magnetic guidance of the motor.
We analyze this for two cases: First, we turn off top-down motor guidance and focus on the bottom-up perception process.
