No-till planting sytsems

"In no-tillage planting systems, a planting is made directly into an essentially unprepared seedbed. Evaluate the economical and practical feasibility if you consider a no-till planting system. You won't always completely eliminate tillage, and your management ability and experience often determine the economic reward."--First page.Zane R. Helsel, Daryl D. Buchholz, Gary Hoette, and L.E. Anderson (Department of Agronomy), Einar Palm (Department of Plant Pathology), George Thomas (Department of Entomology), Don Pfost (Department of Agricultural Engineering, College of Agriculture)New 7/83/10

No-till checklist (1984)

Zane R. Helsel, Daryl D. Buchholz, Gary Hoette, and L.E. Anderson (Department of Agronomy), Einar Palm (Department of Plant Pathology), George Thomas (Department of Entomology), Don Pfost (Department of Agricultural Engineering, College of Agriculture)New 1/84/10

No-till checklist (1987)

Zane R. Helsel, Daryl D. Buchholz, Gary Hoette, and L.E. Anderson (Department of Agronomy), Einar Palm (Department of Plant Pathology), George Thomas (Department of Entomology), Don Pfost (Department of Agricultural Engineering, College of Agriculture)Revised 10/87/10

Characterization of Escherichia coli MG1655 grown in a low-shear modeled microgravity environment

BACKGROUND: Extra-cellular shear force is an important environmental parameter that is significant both medically and in the space environment. Escherichia coli cells grown in a low-shear modeled microgravity (LSMMG) environment produced in a high aspect rotating vessel (HARV) were subjected to transcriptional and physiological analysis. RESULTS: Aerobic LSMMG cultures were grown in rich (LB) and minimal (MOPS + glucose) medium with a normal gravity vector HARV control. Reproducible changes in transcription were seen, but no specific LSMMG responsive genes were identified. Instead, absence of shear and a randomized gravity vector appears to cause local extra-cellular environmental changes, which elicit reproducible cellular responses. In minimal media, the majority of the significantly up- or down-regulated genes of known function were associated with the cell envelope. In rich medium, most LSMMG down-regulated genes were involved in translation. No observable changes in post-culture stress responses and antibiotic sensitivity were seen in cells immediately after exposure to LSMMG. Comparison with earlier studies of Salmonella enterica serovar Typhimurium conducted under similar growth conditions, revealed essentially no similarity in the genes that were significantly up- or down-regulated. CONCLUSION: Comparison of these results to previous studies suggests that different organisms may dramatically differ in their responses to medically significant low-shear and space environments. Depending on their specific response, some organisms, such as Salmonella, may become preadapted in a manner that predisposes them to increased virulence

Pennsylvania Folklife Vol. 16, No. 1

• Indian Readers and Healers by Prayer • Bayard Taylor\u27s Portrait of Pennsylvania Quakerism • Gypsy Stories from the Swatara Valley • Stump-Pulling • Occult Tales from Union County • Beekeeping and Bee Lore in Pennsylvania • New Materials on the 18th Century Emigration from the Speyer State Archives • The Snake-Bitten Dutchman • Notes and Documents: A Letter to Germany (1806) ; Midwestern Diary of Joel Vale Garretson (1863-1864) • Questionnaire on Hominyhttps://digitalcommons.ursinus.edu/pafolklifemag/1025/thumbnail.jp