When subjects learn to associate two sample durations with two comparison keys, do they learn to associate the keys with the short and long samples (relational hypothesis), or with the specific sample durations (absolute hypothesis)? We exposed 16 pigeons to an ABA design in which phases A and B corresponded to tasks using samples of 1 s and 4 s, or 4 s and 16 s. Across phases, we varied the ma...

Absolute high-resolution Se+ photoionization cross-section measurements with Rydberg-series analysis" (2011). Absolute single photoionization cross-section measurements for Se + ions were performed at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory using the photo-ion merged-beams technique. Measurements were made at a photon energy resolution of 5.5 meV from 17.75 to 2...

Using a sample of 771.6×10(6) ϒϒ(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition ϒ(4S)→ηh(b)(1P) with the branching fraction B[ϒ(4S)→ηh(b)(1P)]=(2.18±0.11±0.18)×10(-3) and we measure the h(b)(1P) mass M(h(b)(1P))=(9899.3±0.4±1.0)  MeV/c(2), corresponding to the hyperfine (HF) splitting ΔM(HF)(1P)=(0.6±0.4±1.0)  MeV/c(2)....

The 70S RNA of Rous sarcoma virus contains 4S RNAs which serve as primers for the initiation of DNA synthesis in vitro by the RNA-directed DNA polymerase of the virus. We purified these primers in three different ways-by isolation of the covalent complex between primer and nascent DNA, by differential melting of the 70S RNA, and by two-dimensional electrophoresis in polyacrylamide gels. The 4S ...

The dynamic dipole polarizabilities of the low-lying states of Ca for linearly and circularly polarized light are calculated by using relativistic configuration interaction plus core polarization (RCICP) approach. The magic wavelengths, at which the two levels of the transitions have the same ac Stark shifts, for 4s-4pj,m and 4s-3dj,m magnetic sublevels transitions are determined. The present m...

Following our earlier approach to the synthesis of dihydronepetalactones, all eight stereoisomers of trans-fused iridomyrmecins were synthesized starting from the enantiomers of limonene. Combined gas chromatography and mass spectrometry including enantioselective gas chromatography revealed that volatiles released by the endohyperparasitoid wasp Alloxysta victrix contain (4S,4aR,7S,7aR)-iridom...

Green=FM[C], Black=“FM[localAIF]”, Red=FM[oR], Blue=Tmax[oR]. a) FM vs VTF-delay (MTT=4s, dispersion=0s), b) FM vs VTF-dispersion (MTT=4s, delay=0s), c) FM vs tissue MTT (delay=0s, dispersion=0s). Figure 2: In vivo results from a single patient: Top row: local AIF source voxels. a) method1, b) method2. Middle row: MTT maps. c) global AIF, d) method1, e) method2. Bottom row: Tmax maps. f) global...

A ferredoxin was purified from the hyperthermophilic archaeon, Pyrobaculum islandicum. EPR spectra and metal content analyses suggested that the ferredoxin molecule contained one [3Fe-4S] and one [4Fe-4S] cluster. The ferredoxin was rapidly reduced by 2-oxoglutarate: ferredoxin oxidoreductase purified from P. islandicum, indicating that it functions physiologically as an electron sink for the r...

The Cornell Electron Storage Ring (CESR) is a symmetric ee collider operating at the Υ(4S) resonance. The CLEO II and II.V detector configurations are described in detail elsewhere . The integrated luminosity is 9.2 fb at the Υ(4S) resonance, which corresponds to about 9.7 × 10 BB̄ pairs, and 4.6 fb at energies just below the BB̄ threshold. The results reviewed in this paper are based on this ful...

The prototype ferredoxin maquette, FdM, is a 16-amino acid peptide which efficiently incorporates a single [4Fe-4S]2+/+ cluster with spectroscopic and electrochemical properties that are typical of natural bacterial ferredoxins. Using this synthetic protein scaffold, we have investigated the role of the nonliganding amino acids in the assembly of the iron-sulfur cluster. In a stepwise fashion, ...