2,619 research outputs found
A study of some Peat deposists of the sunbiggin Tarn area, near Orton, Westmorland
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The use of large undisturbed cores to assess soil quality-yield relationships in the greenhouse
Non-Peer ReviewedLarge undisturbed cores were taken from different landscape positions (divergent shoulders, DSH, and convergent footslopes, CFS) at two sites in the Black soil zone. The soils are classified as belonging to the Oxbow association and have been cultivated for 15 and 82 years. The cores were used in a greenhouse experiment to study the effect of soil quality on yield of spring wheat (var. Katepwa) at three levels of simulated growing season precipitation: low (123 mm season-1), mid (189 mm season-1), and high (332 mm season-1). Grain yields in the DSH cores increased with increasing precipitation for both the 15- and 82-year soils. Moreover, the 15-year DSH cores out-yielded their 82-year counterparts by 50, 76, and 85% at the low, mid, and high water levels, respectively. Cores from the CFS positions were watered only at the mid-water level. Grain yields in the 15- and 82-year CFS cores and the 15-year DSH cores were not significantly different (P < 0.05). The results of this study indicate that soil quality is a relatively minor factor when water is limiting but assumes a much greater role in years of normal or above normal growing season precipitation. These initial results also suggest that large cores are a feasible and cost-effective means of studying soil-plant relationships in the greenhouse or growth chamber
The (p,d) Reaction at E_p=121 MeV
This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit
A Model for the Schottky Anomaly in Metallic
We present a simple model for the doped compound , in
order to explain some recent experimental results on the latter. Within a
Hartree-Fock context, we start from an impurity Anderson-like model and
consider the magnetic splitting of the - ground state Kramers doublet
due to exchange interactions with the ordered moments. Our results are in
very good agreement with the experimental data, yielding a Schottky anomaly
peak for the specific heat that reduces its amplitude, broadens and shifts to
lower temperatures, upon doping. For overdoped compounds at low
temperatures, the specific heat behaves linearly and the magnetic
susceptibility is constant. A smooth transition from this Fermi liquid like
behavior ocurrs as temperature is increased and at high temperatures the
susceptibility exhibits a Curie-like behavior. Finally, we discuss some
improvements our model is amenable to incorporate.Comment: 7 pages, 5 figures, and 13 reference
State-selective imaging of cold atoms
Atomic coherence phenomena are usually investigated using single beam techniques without spatial resolution. Here we demonstrate state-selective imaging of cold 85Rb atoms in a three-level ladder system, where the atomic refractive index is sensitive to the quantum coherence state of the atoms. We use a phase-sensitive diffraction contrast imaging (DCI) technique which depends on the complex refractive index of the atom cloud. A semiclassical model allows us to analytically calculate the detuning-dependent refractive index of the system. The predicted Autler-Townes splitting and our experimental measurements are in excellent agreement. DCI provided a quantitative image of the distribution of the excited-state fraction, and compared with on-resonance absorption and blue cascade fluorescence techniques, was found to be experimentally simple and robust
The (p,t) Reaction at Higher Energy
This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit
Goserelin, as an ovarian protector during (neo)adjuvant breast cancer chemotherapy, prevents long term altered bone turnover
Background: The Ovarian Protection Trial In Premenopausal Breast Cancer Patients “OPTION” trial
(NCT00427245) was a prospective, multicenter, randomised, open label study evaluating the frequency of
primary ovarian insufficiency (POI) at 12 months in women randomised to 6–8 cycles of (neo)adjuvant
chemotherapy (CT) þ/ goserelin (G). Here we report the results of a secondary endpoint analysis of the
effects of CTþ/-G on markers of bone turnover.
Methods: Serum for bone alkaline phosphatase (BALP) and urine for N-terminal telopeptide (NTX) were
collected at baseline, 6, 12, 18, 24 and 36 months. Changes in median levels of bone turnover markers
were evaluated for the overall population, according to age stratification at randomisation (r40 vs 440
years) and with exploratory analysis according to POI rates at 12 months.
Results: In the overall population, there was a significant increase in NTX at 6 months compared to
baseline in patients treated with CTþG (40.81 vs 57.82 p¼0.0074) with normalisation of levels thereafter.
BALP was significantly increased compared to baseline at 6 months and 12 months in those receiving
CTþG, but normalised thereafter. BALP remained significantly higher compared to baseline at 12, 24 and
36 months in patients receiving CT, resulting in a significant difference between treatment groups at 36
months (CTþG 5.845 vs CT 8.5 p¼0.0006). These changes were predominantly seen in women 440
years. Women with POI at 12 months showed altered bone formation compared to baseline levels for a
longer duration than women who maintained menses.
Conclusion: Addition of G to CT increases bone turnover during treatment with normalisation after
cessation of treatment suggesting G may offer sufficient ovarian protection against CT induced POI to
negate longstanding altered bone turnover associated with POI
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