297 research outputs found
Recommended from our members
Experimental evidence of a dynamic Jahn-Teller effect in C+60.
Detailed analysis of the highest occupied molecular orbital band shape in the photoelectron spectrum of gaseous C60 reveals a dynamic Jahn-Teller effect in the ground state of C+60. The direct observation of three tunneling states asserts a D3d geometry for the isolated cation, originating from a strong vibronic coupling. These results show that the ionic motion plays an important role in the electron-phonon interaction
The indigenous arbuscular mycorrhizal fungal colonisation potential in potato roots is affected by agricultural treatments
ArticlesThere is an urgent need to develop novel approaches to enhance sustainable agriculture
while not reducing cr
op yields. Arbuscular mycorrhizal (AM) fungi establish symbiotic
associations with most crop plants improving plant performance and soil health. This study
investigated the extent of
colonisation
of potato roots by indigenous AM
fungi
in the arable soil
under
conventional
and organic farming systems. Potato roots had greater AM fungal colonisation
levels under
organic
than
conventional
farming, though in general, root colonisation levels were
extremely low
in both farming
systems
. Pota
to root AM
fungal
colonisation
was
lower
with
higher soil P content
and
higher with higher annual C
input.
Trap plant root AM fungal
colonisation was
considerably higher than in field potato roots and showed that soil mycorrhizal
inoculum potential was hig
her in organic than in conventional farming.
Thus, the positive impact
of manure application in organic fields to the potato AM fungal colonisation can be explained by
previous higher total annual C fresh organic matter input and lower soil P content under
treatment.
Furthermore, the natural AM fungal abundance in the soil was sufficient to colonise trap plant
roots, suggesting a low mycorrhizal dependence of the studied potato cultivar
Morphological and elemental evaluation of SDF on dentine in saliva
Poster Presentation: Scientific Groups - 24. Mineralized Tissue: no. 172OBJECTIVES: Silver diammine fluoride (SDF) is an effective agent for caries management. Its interaction with saliva is unknown. The aim was to investigate the effect of SDF on dentine with natural and artificial saliva and evaluate different potential saliva solutions. METHODS: 20 dentine samples were randomly assigned into 4 storage groups: deionized water (DIW, negative control), artificial saliva (AS), basal medium mucin (BMM), and unstimulated whole saliva (UWS, clinical reference). After which they were submitted to the demineralization process (50 mM acetate buffer, pH 4.5) for 3 days. 38 wt% SDF (SaforideTM) was then applied ...postprin
Angle-resolved two-dimensional mapping of electron emission from the inner-shell 2p excitations in Cl<sub>2</sub>
Angle-resolved Auger and valence photoelectron spectra were measured over a 14-eV photon energy range across the Cl2 2p ionization thresholds. The measurements were carried out using highly efficient time-of-flight spectrometers coupled with photons from the Atomic and Molecular undulator beamline of the Advanced Light Source and an advanced data-acquisition system. Auger-electron spectra of 2âpÏ* and 2âpnl resonances were analyzed and the evolution of the resonant Auger to the normal Auger decay distorted by postcollision interaction was examined. We find that valence photoionization channels do not resonate strongly at the photon energies of the core-to-Rydberg excitation, in contrast to the strongly resonating ones observed in the HCl molecule. Auger decay spectra of the 2pâ1Ï* resonances showed no evidence of atomic transitions in Cl*, also in contrast to HCl. In addition, angular distribution of the photoelectron and Auger-electron lines was derived
- âŠ