Farm, Rural Economy, and Policy Implications of Sustainable Agriculture in South Dakota

South Dakota State University (SDSU) has been conducting research since the mid- 1980s on what has come to be called sustainable agriculture. We have been examining farming systems in which producers adopt management-intensive, holistic system orientations in planning their farms. Such farm managers generally view themselves as allies with nature, rather than as conquerors of nature. In addition to economic survivability, these farmers tend to give high priority to (1) being good stewards of the soil, (2) reducing pollution of ground and surface water, (3) raising chemical residue free, high quality products, and (4) reducing possible harmful effects of farm chemicals on their families\u27 health

A man to his mate /

Frontispiece and plates facing p. 10, 104 and 222.Verso of t.p.: Press of Braunworth & Co., book manufacturers, Brooklyn, N.Y.Copyright date from verso of t.p.Mode of access: Internet

A Compact X-Ray Free Electron Laser

We present a design concept and simulation of the performance of a compact x-ray, free electron laser driven by ultra-high gradient rf-linacs. The accelerator design is based on recent advances in high gradient technology by a LLNL/SLAC/LBL collaboration and on the development of bright, high current electron sources by BNL and LANL. The GeV electron beams generated with such accelerators can be concerted to soft x-rays in the range from 2--10 nm by passage through short period, high fields strength wigglers as are being designed at Rocketdyne. Linear light sources of this type can produce trains of picosecond (or shorter) pulses of extremely high spectral brilliance suitable for flash holography of biological specimens in vivo and for studies of fast chemical reactions. 12 refs., 8 figs., 4 tabs

The Mercury Resistance (Mer) Operon In A Marine Gliding Flavobacterium, Tenacibaculum Discolor 9a5

Genes conferring mercury resistance have been investigated in a variety of bacteria and archaea but not in bacteria of the phylum Bacteroidetes, despite their importance in many environments. We found, however, that a marine gliding Bacteroidetes species, Tenacibaculum discolor, was the predominant mercury-resistant bacterial taxon cultured from a salt marsh fertilized with mercury-contaminated sewage sludge. Here we report characterization of the mercuric reductase and the narrow-spectrum mercury resistance (mer) operon from one of these strains T. discolor 9A5. This mer operon, which confers mercury resistance when cloned into Flavobacterium johnsoniae, encodes a novel mercury-responsive ArsR/SmtB family transcriptional regulator that appears to have evolved independently from other mercury-responsive regulators, a novel putative transport protein consisting of a fusion between the integral membrane Hg(II) transporter MerT and the periplasmic Hg(II)-binding protein MerP, an additional MerP protein, and a mercuric reductase that is phylogenetically distinct from other known mercuric reductases