Crystallographic structure reveals phosphorylated pilin from Neisseria : phosphoserine sites modify type IV pilus surface chemistry and fibre morphology

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72468/1/j.1365-2958.1999.01184.x.pd

Pigment-Protein Interactions in Phytochromes Probed by Fluorescence Line Narrowing Spectroscopy

Fluorescence line narrowing (FLN) spectroscopy was used to study bacteriophytochromes and variants from various species in their red-absorbing Pr ground state, including phytochromes Agp1 from Agrobacterium tumefaciens, DrBphP from Deinococcus radiodurans, and RpBphP2 and RpBphP3 from Rhodopseudomonas palustris. A species-dependent narrowing of the fluorescence emission bands is observed. The results suggest varied pigment-protein interactions, possibly connected to chromophore mobility or extended water pyrrole networks inside of the differing binding pockets. Solvent water isotope exchange from

Nuclear moments, charge radii and spins of the ground and isomeric states in 175 Yb and 177 Yb

This paper reports static moments and changes in mean-square charge radii of175, 177, 177mYb measured using collinear laser spectroscopy at the IGISOL facility. The moments are compared to predictions made using the Nilsson model to determine the purity of the multi-quasiparticle T1/2 = 11.4 s, Iπ = 8 state of176Yb and the ground state of177Yb. The ground-state spins of175, 177Yb and the T1/2 = 6.41 s, E = 331.5 keV isomeric state in177Yb, have been measured from the hyperfine structure to be 7/2, 9/2 and 1/2 respectively

First results from laser spectroscopy on bunched radioactive beams from the JYFL ion-beam cooler

A new RFQ ion-beam cooler and buncher, installed after the mass-separating magnet of the ion guide isotope separator, IGISOL, JYFL, has dramatically increased the scope of on-line laser spectroscopy at this facility. The device, operated in a bunching mode, has permitted new measurements on short-lived radionuclei in the Ti, Zr and Hf chains at a sensitivity two orders of magnitude greater than that previously achieved. The device has also opened new prospects for laser-based nuclear spectroscopy at the facility, particularly collinear resonance ionisation spectroscopy

Magnetic and quadrupole moments of neutron deficient 58–62Cu^{58–62}Cu isotopes

This paper reports on the ground state nuclear moments measured in (58-62)Cu using collinear laser spectroscopy at the ISOLDE facility. The quadrupole moments for (58-60)Cu have been measured for the first time as Q ((58)Cu) = 15(3) efm(2), Q ((59)Cu) = -19.3(19) efm(2), Q((60)Cu) = +11.6(12) efm(2) and with higher precision for (61.62)Cu as Q ((61)Cu) = -21.1(10) efm(2), Q((62)Cu) = -2.2(4) efm(2). The magnetic moments of (58.59)Cu are measured with a higher precision as(IL)((58)Cu) = +0.570(2)(ILN) and (IL)((59)Cu) = +1.8910(9)(ILN). The experimental nuclear moments are compared to large-scale shell-model calculations with the GXPF1 and GXPF1A effective interactions, allowing the softness of the (56)Ni core to be studied. (C) 2011 Published by Elsevier B.V

Ground-state spins and moments of (72,74,76,78)Ga nuclei

Laser spectroscopy was performed on the (72,74,76,78)Ga isotopes at On-Line Isotope Mass Separator (ISOLDE) facility, CERN. Ground-state nuclear spins and moments were extracted from the measured hyperfine spectra. The results are compared to shell-model calculations, which provide a detailed probe of the nuclear wave function. The spin is established from the shape of the hyperfine structure and the parity inferred from a comparison of shell-model calculations with the measured nuclear moments. The ground states of (76,78)Ga are both assigned a spin and parity of I(pi) = 2(-), while (74)Ga is tentatively assigned as I(pi) = 3(-). For (72)Ga, the results are consistent with the previous I = 3 assignment