of lumbar spine showing LI, L2, L4, and L5 vertebrae with vestiges of posterior elements ofL3 (arrowed). Note codfish appearance ofL2, L4, and LS. Right: lateral view oflumbar spine showing narrowing ofdisc spaces ofT12 andL I and kyphos between L2 and L4, pseudo-Schmorl's nodes at upper and lower surfaces of T12, and bridging anterio-lateral osteophytes between L2 and L4. Only vestiges ofposte...

We describe two open problems related to first order regret bounds for contextual bandits. The first asks for an algorithm with a regret bound of Õ( √ L?K lnN) where there areK actions,N policies, andL? is the cumulative loss of the best policy. The second asks for an optimization-oracle-efficient algorithm with regret Õ(L ? poly(K, ln(N/δ))). We describe some positive results, such as an ineff...

M14late is a key intermiie(liate in converting acetyl units to sucrose in germinating castor beans (8). In an earlier paper evidence wsas presente(d to show that a mechanism exists for the pro(luction of phosphoenol-pyruvate from nmalate in this material andl that phosphoenol-I)yruvate is an interme(liate in the production of sucrose fromii malate (6). In this paper indivi(lual reactions which ...

I am full} aware of the very great honour done me by my electioni as President of the Northerni Ireland(13ranlich of the British Medical Associationi, but, at the same time, I am acutelyN conscious of mn inability to fill that positioni in thle manniier to whlich you have been accustomed. For the past twelve months I have been attending meetings of Branch Cotuncil, etc., endeavouring to learn m...

INTRODUCTION. IN a recent review of worlcl tuberculosis mortality, MIcDougall (1950) demiioinstrated that niortalitv has declined in most of the countries which publish reasonablv reliable statistics. Of twentv-nine countries considered, only in Portugal andl Scotland were the crude death rates less in 1937-:39 than in 1947-49. '1'he average aninual rates quoted for Northern Ireland, 91.2 and 6...

Our purpose was to determine the specificity of l-arginine (l-Arg)-induced conducted signals for intra- vs. extracellular actions ofl-Arg. Diameter and red blood cell velocities were measured for arterioles [18 ± 1.6 (SE) μm] in the cremaster muscle of pentobarbital sodium-anesthetized (Nembutal, 70 mg/kg) hamsters ( n = 53). Remote (conducted) responses were viewed ∼1,000 μm upstream from the ...