Zobrazeno 1 - 10
of 12
pro vyhledávání: '"J. W. McMahon"'
Autor:
M. C. Nolan, E. S. Howell, D. J. Scheeres, J. W. McMahon, O. Golubov, C. W. Hergenrother, J. P. Emery, K. S. Noll, S. R. Chesley, D. S. Lauretta
Publikováno v:
Geophysical Research Letters, Vol 46, Iss 4, Pp 1956-1962 (2019)
Abstract We observed the near‐Earth asteroid (101955) Bennu from the ground in 1999 and 2005, and with the Hubble Space Telescope (HST) in 2012, to constrain its rotation rate. The data reveal an acceleration of 2.64 ± 1.05 × 10−6 deg/day2, whi
Externí odkaz:
https://doaj.org/article/8f48d82704a3437e943a1f57c8487299
Autor:
O. S. Barnouin, M. G. Daly, J. A. Seabrook, Y. Zhang, F. Thuillet, P. Michel, J. H. Roberts, R. T. Daly, M. E. Perry, H. C. M. Susorney, E. R. Jawin, R.‐L. Ballouz, K. J. Walsh, M. M. Sevalia, M. M. Al Asad, C. L. Johnson, E. B. Bierhaus, R. W. Gaskell, E. E. Palmer, J. Weirich, B. Rizk, C. Y. Drouet D’Aubigny, M. C. Nolan, D. N. DellaGiustina, D. J. Scheeres, J. W. McMahon, H. C. Connolly, D. C. Richardson, C. W. V. Wolner, D. S. Lauretta
Publikováno v:
Journal of Geophysical Research: Planets. 127
Publikováno v:
Hydrobiologia. 126:103-107
Publikováno v:
International Journal of Environmental Analytical Chemistry. 24:297-303
A method is described for determining stable cobalt concentrations in fish flesh and bone using polarized Zeeman effect graphite furnace atomic absorption spectrometry (ZAAS). Cobalt analysis on freshwater fish flesh samples (10 g dry weight) require
Autor:
J. W. Mcmahon
Publikováno v:
Limnology and Oceanography. 14:357-367
Changes in the vertical distribution of acid-soluble ferrous and total iron in filtered lake water were measured weekly for 12 months using the organic reagent bathophenanthroline. Acid-soluble ferrous iron was present throughout all strata, the conc
Autor:
J. W. Mcmahon
Publikováno v:
Canadian Journal of Zoology. 48:873-878
Radioactive tracer studies of the ingestion and cycling of iron by Daphnia magna showed that about 60% of the iron was present as gut contents. Daphnia assimilated iron at the rate of 3.8 × 10−3 μg per milligram dry weight per hour. After feeding
Autor:
J. W. McMahon, F. H. Rigler
Publikováno v:
Canadian Journal of Zoology. 41:321-332
Feeding regulation by the plank tonic crustacean Daphnii magna was studied in increasing concentrations of two foods: Chlorella vulgaris and Saccharomyces cerevisiae. Direct observation studies show that feeding rate is proportional to concentration
Autor:
J. W. McMahon, F. H. Rigler
Publikováno v:
Limnology and Oceanography. 10:105-113
The feeding rate of Daphnia magna was studied by measuring the radioactivity of animals fed on pure cultures of Escherichia coli, Saccharomyces cerevisiae, Chlorella vulgaris, and Tetrahymena pyriformis labeled with radioactive phosphorus. Below a ce
Autor:
J. W. McMahon
Publikováno v:
Canadian Journal of Zoology. 46:759-762
Feeding behavior of Daphnia magna on the food organism Saccharomyces cerevisiae, determined by electronic measurement of frequency of thoracic appendage movements (FTA), differs between groups cultured in lake, river, and dechlorinated tap water. FTA
Autor:
J. W. McMahon
Publikováno v:
Limnology and Oceanography. 12:437-442
Measurement of ferrous iron in lake water by solvent extraction of the ferrous bathophenanthroline (BPA) complex (Let and Stumm 1960; amended by Shapiro 1966) has yielded rather erratic and nonreproducible results. The variability is attributed to th