14,190 research outputs found
Survey and Annotated Checklist of the Later Summer Flora of the Moist Soil Units at Holla Bend National Wildlife Refuge
We conducted a floristic survey of 22 moist soil units at Holla Bend National Wildlife Refuge during September and October of 1990. The moist soil units range in size from 0.4 to 9.7 ha and are depressions manipulated to provide food and shelter for waterfowl. In total, 60 taxa representing 24 families and 42 genera were identified and are compiled into an annotated checklist. The flora was dominated by the following families and genera in decreasing order of importance: Asteraceae (Xanthium), Polygonaceae (Polygonum), and Amaranthaceae (Amaranthus). The Poaceae and the Cyperaceae were well represented, but were of lesser importance. Twenty-three of the collections represent new records for Pope County and voucher specimens have been placed in the Arkansas Tech University Herbarium (APCR). The checklist and abundance data will benefit Refuge personnel in management of the units
When You and I Were Young, Maggie
VERSE 1I wandered today to the hill, Maggie,To watch the scene below;The creek and the creaking old mill, Maggie,As we used to long ago,The green grove is gone from the hill, Maggie,Where first the daisies sprung;The creaking old mill is still, Maggie,Since you and I were young.
CHORUSAnd now we are aged and gray, Maggie,And the trials of life nearly done;Let us sing of the days that are gone, Maggie,When you and I were young.Let us sing,
VERSE 2A city so silent and lone, Maggie,Where the young and the gay and the best,In polished white mansions of stone, Maggie,Have each found a place of rest,Is built were the birds used to play, Maggie,And join in the songs that were sung:For we sang as gay as they. Maggie,When you and I were young.
CHORUS
VERSE 3They say I am feeble with age, MaggieMy steps are less sprightly than then,My face is a well-written page, Maggie,But time alone was the pen.They say we are aged and gray, Maggie,As sprays by the white breakers flung;But to me you’re as fair as you were, MaggieWhen you and I were young.
CHORU
Endogenous Nutritive Support after Traumatic Brain Injury: Peripheral Lactate Production for Glucose Supply via Gluconeogenesis.
We evaluated the hypothesis that nutritive needs of injured brains are supported by large and coordinated increases in lactate shuttling throughout the body. To that end, we used dual isotope tracer ([6,6-(2)H2]glucose, i.e., D2-glucose, and [3-(13)C]lactate) techniques involving central venous tracer infusion along with cerebral (arterial [art] and jugular bulb [JB]) blood sampling. Patients with traumatic brain injury (TBI) who had nonpenetrating head injuries (n=12, all male) were entered into the study after consent of patients' legal representatives. Written and informed consent was obtained from healthy controls (n=6, including one female). As in previous investigations, the cerebral metabolic rate (CMR) for glucose was suppressed after TBI. Near normal arterial glucose and lactate levels in patients studied 5.7±2.2 days (range of days 2-10) post-injury, however, belied a 71% increase in systemic lactate production, compared with control, that was largely cleared by greater (hepatic+renal) glucose production. After TBI, gluconeogenesis from lactate clearance accounted for 67.1% of glucose rate of appearance (Ra), which was compared with 15.2% in healthy controls. We conclude that elevations in blood glucose concentration after TBI result from a massive mobilization of lactate from corporeal glycogen reserves. This previously unrecognized mobilization of lactate subserves hepatic and renal gluconeogenesis. As such, a lactate shuttle mechanism indirectly makes substrate available for the body and its essential organs, including the brain, after trauma. In addition, when elevations in arterial lactate concentration occur after TBI, lactate shuttling may provide substrate directly to vital organs of the body, including the injured brain
The average X-ray/gamma-ray spectrum of radio-quiet Seyfert 1s
We have obtained the average 1--500 keV spectrum of radio-quiet Seyfert 1s
using data from EXOSAT, Ginga, HEAO, and GRO/OSSE. The spectral fit to the
combined average EXOSAT and OSSE data is fully consistent with that for Ginga
and OSSE, confirming results from an earlier Ginga/OSSE sample. The average
spectrum is well-fitted by a power-law X-ray continuum with an energy spectral
index of moderately absorbed by an ionized medium and with
a Compton reflection component. A high-energy cutoff (or a break) in the the
power-law component at a few hundred keV or more is required by the data. We
also show that the corresponding average spectrum from HEAO A1 and A4 is fully
compatible with that obtained from EXOSAT, Ginga and OSSE. These results
confirm that the apparent discrepancy between the results of Ginga (with
) and the previous results of EXOSAT and HEAO (with ) is indeed due to ionized absorption and Compton reflection first
taken into account for Ginga but not for the previous missions. Also, our
results confirm that the Seyfert-1 spectra are on average cut off in gamma-rays
at energies of at least a few hundred keV, not at keV (as suggested
earlier by OSSE data alone). The average spectrum is compatible with emission
from either an optically-thin relativistic thermal plasma in a disk corona, or
with a nonthermal plasma with a power-law injection of relativistic electrons.Comment: 7 pages, 3 Postscript figures, MNRAS accepte
P04.03. Primary care providers’ attitudes and beliefs about, and personal use of, complementary and alternative medicine (CAM)
New Development in Hydrogen Perm Selective Membranes
The objectives of the original project was to
develop silica hydrogen permselective membranes
and evaluate the economic feasibility of these
membranes in hydrogen production from coal gas.
The objectives of the work reported here were to
increase the membrane permeance by developing
new precursors or deposition conditions, and to
carry out fundamental permeability measurements
of the membrane at different stages of pore
narrowing
A simple all-microwave entangling gate for fixed-frequency superconducting qubits
We demonstrate an all-microwave two-qubit gate on superconducting qubits
which are fixed in frequency at optimal bias points. The gate requires no
additional subcircuitry and is tunable via the amplitude of microwave
irradiation on one qubit at the transition frequency of the other. We use the
gate to generate entangled states with a maximal extracted concurrence of 0.88
and quantum process tomography reveals a gate fidelity of 81%
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