Controlling Cotton Root Rot on Ornamental Plants.

4 p

Controlling Cotton Root Rot on Ornamental Plants.

4 p

A study of the unsuccessful adjustments of fourteen patients from the Boston State Hospital in family care homes between September 1, 1954 and August 31, 1955 /

Thesis (M.S.)--Boston University Includes bibliographical references (leaves 81-82)

Neutrino Oscillation Observables from Mass Matrix Structure

We present a systematic procedure to establish a connection between complex neutrino mass matrix textures and experimental observables, including the Dirac CP phase. In addition, we illustrate how future experimental measurements affect the selection of textures in the (theta_13,delta_CP)-plane. For the mixing angles, we use generic assumptions motivated by quark-lepton complementarity. We allow for any combination between U_l and U_nu, as well as we average over all present complex phases. We find that individual textures lead to very different distributions of the observables, such as to large or small leptonic CP violation. In addition, we find that the extended quark-lepton complementarity approach motivates future precision measurements of delta_CP at the level of theta_C \simeq 11 degrees.Comment: Version to appear in Phys. Lett. B. A complete list of textures can be found at http://theorie.physik.uni-wuerzburg.de/~winter/Resources/CTex/index.html . 7 pages, 1 figure, 1 tabl

Not a Second Time? John Lennon’s Aeolian Cadence Reconsidered

In 1963 William Mann coined the term “aeolian cadence” to describe a harmonic progression in the song “Not a Second Time” by the Beatles. This term has caused confusion ever since. In this article, I discuss why Mann might have used this confusing phrase and how it relates to this song by John Lennon. I will argue that, in the debate that ensued from Mann’s observations, his commentators were primarily preoccupied with terminology and definitions but forgot to listen to Lennon. More specifically, I argue that, if the interplay between the music and lyrics is considered, the famous cadence in “Not a Second Time” can best be interpreted as “deceptive.

Promiscuous Partitioning of a Covalent Intermediate Common in the Pentein Superfamily

SummaryMany enzymes in the pentein superfamily use a transient covalent intermediate in their catalytic mechanisms. Here we trap and determine the structure of a stable covalent adduct that mimics this intermediate using a mutant dimethylarginine dimethylaminohydrolase and an alternative substrate. The interactions observed between the enzyme and trapped adduct suggest an altered angle of attack between the nucleophiles of the first and second half-reactions of normal catalysis. The stable covalent adduct is also capable of further reaction. Addition of imidazole rescues the original hydrolytic activity. Notably, addition of other amines instead yields substituted arginine products, which arise from partitioning of the intermediate into the evolutionarily related amidinotransferase reaction pathway. The enzyme provides both selectivity and catalysis for the amidinotransferase reaction, underscoring commonalities among the reaction pathways in this mechanistically diverse enzyme superfamily. The promiscuous partitioning of this intermediate may also help to illuminate the evolutionary history of these enzymes

Human Centered Decision Support Tools for Arrival Merging and Spacing

A simulation of terminal area merging and spacing with air traffic controllers and commercial flight crews was conducted. The goal of the study was to assess the feasibility and benefits of ground and flight-deck based tools to support arrival merging and spacing operations. During the simulation, flight crews arrived over the northwest and southwest arrival meter fixes and were cleared for the flight management system arrivals to runways 18 and 13 right. The controller could then clear the aircraft to merge behind and space with an aircraft on a converging stream or to space behind an aircraft on the same stream of traffic. The controller remained responsible for aircraft separation. Empirical research was performed to assess air and ground tools and the effects of mixed equipage. During the all tools conditions, 75% of the arrivals were equipped for merging and spacing. All aircraft were ADS-B equipped and flew charted FMS routes which were coordinated based on wake turbulence separation at the arrival runway. The aircraft spacing data indicate that spacing and merging were improved with either air or ground based merging and spacing tools, but performance was best with airborne tools. Both controllers and pilots exhibited low to moderate workload and both reported benefits from the concept

Galactic winds driven by cosmic-ray streaming

Galactic winds are observed in many spiral galaxies with sizes from dwarfs up to the Milky Way, and they sometimes carry a mass in excess of that of newly formed stars by up to a factor of ten. Multiple driving processes of such winds have been proposed, including thermal pressure due to supernova-heating, UV radiation pressure on dust grains, or cosmic ray (CR) pressure. We here study wind formation due to CR physics using a numerical model that accounts for CR acceleration by supernovae, CR thermalization, and advective CR transport. In addition, we introduce a novel implementation of CR streaming relative to the rest frame of the gas. We find that CR streaming drives powerful and sustained winds in galaxies with virial masses M_200 < 10^{11} Msun. In dwarf galaxies (M_200 ~ 10^9 Msun) the winds reach a mass loading factor of ~5, expel ~60 per cent of the initial baryonic mass contained inside the halo's virial radius and suppress the star formation rate by a factor of ~5. In dwarfs, the winds are spherically symmetric while in larger galaxies the outflows transition to bi-conical morphologies that are aligned with the disc's angular momentum axis. We show that damping of Alfven waves excited by streaming CRs provides a means of heating the outflows to temperatures that scale with the square of the escape speed. In larger haloes (M_200 > 10^{11} Msun), CR streaming is able to drive fountain flows that excite turbulence. For halo masses M_200 > 10^{10} Msun, we predict an observable level of H-alpha and X-ray emission from the heated halo gas. We conclude that CR-driven winds should be crucial in suppressing and regulating the first epoch of galaxy formation, expelling a large fraction of baryons, and - by extension - aid in shaping the faint end of the galaxy luminosity function. They should then also be responsible for much of the metal enrichment of the intergalactic medium.Comment: 25 pages, 14 figures, accepted by MNRA