1.
Science
; 177(4047): 453-6, 1972 Aug 04.
Article
in English
| MEDLINE
| ID: mdl-5043150
Subject(s)
Environment , Nitrogen , Radioisotopes , Atmosphere , Fertilizers , Nitrogen Isotopes , Soil , Water Pollution, Chemical
2.
Science
; 174(4016): 1331-4, 1971 Dec 24.
Article
in English
| MEDLINE
| ID: mdl-5135719
ABSTRACT
Measurements of nitrate concentration and relative enrichment in nitrogen-15 were made on samples of the surface waters of a typical Illinois corn belt watershed and the effluent of the subterranean tiles that drain the cropped land in the region. From these measurements, we estimate that at the time of peak nitrate concentration in the spring of 1970 a minimum of 55 to 60 percent of the nitrogen found as nitrate in the surface waters of this watershed originated from fertilizer nitrogen
Subject(s)
Fertilizers , Nitrates/analysis , Nitrogen/analysis , Water Pollution/analysis , Illinois , Nitrogen Isotopes/analysis , Seasons , Spectrophotometry , Water Pollution, Chemical/analysis
3.
Virology
; 39(2): 286-95, 1969 Oct.
Article
in English
| MEDLINE
| ID: mdl-5344287
Subject(s)
Dactinomycin/pharmacology , Nicotiana/metabolism , Plants, Toxic , RNA/biosynthesis , Tobacco Mosaic Virus/analysis , Centrifugation, Density Gradient , Dactinomycin/administration & dosage , RNA/isolation & purification , RNA, Viral/biosynthesis , RNA, Viral/isolation & purification , Ribosomes
4.
Proc Natl Acad Sci U S A
; 58(3): 1197-204, 1967 Sep.
Article
in English
| MEDLINE
| ID: mdl-16578663
