175 research outputs found
The Counsellor
JOHN UPDIKE of Georgetown, Massachusetts is one of the most widely translated of contemporary American writers. His recent books are The Coup and Problems, and he is currently completing a New England novel
In the Cemetery High Above Shillington
John Updike\u27s Collected Poems 1953-1993 was published by Knopf last spring. His most recent novel is Brazil. A frequent OR contributor, he lives in Beverly Farms, Massachusetts
Dealing With Wild Pig Depredation In California: The Strategic Plan
The Wild Pig Management Plan is required by Fish and Game Code Section 4651. It is intended to be a strategic plan for dealing with wild pigs for the five-year period 1995-2000. The plan is a dynamic document that will be reviewed and updated at least every five years.
As prescribed by law, the plan contains information related to the status and trend of wild pig populations, and describes management units established by the Department to address regional needs and opportunities. Those needs include alleviating damage to property, protecting sensitive natural resources, and providing recreational hunting where feasible. Opportunities include using the demand for recreational hunting of wild pigs as a practical and cost-effective means of controlling wild pigs and their impact on property and natural resources. In addition, there are opportunities for cooperation between public agencies, conservation organizations, and private landowners that use incentives to manage wild pigs in conjunction with primary land use objectives.
The plan invites participation from the public and incorporates the results of surveys and applied research to achieve stated objectives. The plan has seven objectives as follows:
1) Study the distribution and density of wild pigs in California. 2) Reduce wild pig depredation on private land. 3) Increase hunting opportunities. 4) Determine the impact of wild pigs on native communities and agricultural areas. 5) Provide public information. 6) Monitor disease, both endemic and exotic, in the wild pig population. 7) Investigate the economic impact of wild pigs.
This paper will only concentrate on that aspect of the plan that deals with reducing wild pig depredation on private land
The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125
We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and C IV, implying a likely redshift of z = 1.547. The well-sampled light curves, in particular from 0.5 to 4 days after the burst, suggest a jet break at 3.7 days, corresponding to a jet opening angle of ~7.0°, and implying an intrinsic GRB energy in the 1-10,000 keV band of around Eγ = (6.3–6.9) × 1051 ergs (based on the fluences measured by the gamma-ray detectors of the IPN). GRB 070125 is among the brightest afterglows observed to date. The SED implies a host extinction of AV \u3c 0.9 mag . Two rebrightening episodes are observed, one with excellent time coverage, showing an increase in flux of 56% in ~8000 s. The evolution of the afterglow light curve is achromatic at all times. Late-time observations of the afterglow do not show evidence for emission from an underlying host galaxy or supernova. Any host galaxy would be subluminous, consistent with current GRB host galaxy samples. Evidence for strong Mg II absorption features is not found, which is perhaps surprising in view of the relatively high redshift of this burst and the high likelihood for such features along GRB-selected lines of sight
Divergent evolution of extreme production of variant plant monounsaturated fatty acids
Metabolic extremes provide opportunities to understand enzymatic and metabolic plasticity and biotechnological tools for novel biomaterial production. We discovered that seed oils of many Thunbergia species contain up to 92% of the unusual monounsaturated petroselinic acid (18:1Δ6), one of the highest reported levels for a single fatty acid in plants. Supporting the biosynthetic origin of petroselinic acid, we identified a Δ6-stearoyl-acyl carrier protein (18:0-ACP) desaturase from Thunbergia laurifolia, closely related to a previously identified Δ6-palmitoyl-ACP desaturase that produces sapienic acid (16:1Δ6)- rich oils in Thunbergia alata seeds. Guided by a T. laurifolia desaturase crystal structure obtained in this study, enzyme mutagenesis identified key amino acids for functional divergence of Δ6 desaturases from the archetypal Δ9-18:0-ACP desaturase and mutations that result in nonnative enzyme regiospecificity. Furthermore, we demonstrate the utility of the T. laurifolia desaturase for the production of unusual monounsaturated fatty acids in engineered plant and bacterial hosts. Through stepwise metabolic engineering, we provide evidence that divergent evolution of extreme petroselinic acid and sapienic acid production arises from biosynthetic and metabolic functional specialization and enhanced expression of specific enzymes to accommodate metabolism of atypical substrates
The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125
We report on multi-wavelength observations, ranging from the X-ray to radio
wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic
observations reveal the presence of absorption lines due to O I, Si II, and C
IV, implying a likely redshift of z = 1.547. The well-sampled light curves, in
particular from 0.5 to 4 days after the burst, suggest a jet break at 3.7 days,
corresponding to a jet opening angle of ~7.0 degrees, and implying an intrinsic
GRB energy in the 1 - 10,000 keV band of around E = (6.3 - 6.9)x 10^(51) erg
(based on the fluences measured by the gamma-ray detectors of the IPN network).
GRB 070125 is among the brightest afterglows observed to date. The spectral
energy distribution implies a host extinction of Av < 0.9 mag. Two
rebrightening episodes are observed, one with excellent time coverage, showing
an increase in flux of 56% in ~8000 seconds. The evolution of the afterglow
light curve is achromatic at all times. Late-time observations of the afterglow
do not show evidence for emission from an underlying host galaxy or supernova.
Any host galaxy would be subluminous, consistent with current GRB host-galaxy
samples. Evidence for strong Mg II absorption features is not found, which is
perhaps surprising in view of the relatively high redshift of this burst and
the high likelihood for such features along GRB-selected lines of sight.Comment: 50 pages, 9 figures, 5 tables Accepted to the Astrophysical Journa
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