Zobrazeno 1 - 10
of 17
pro vyhledávání: '"J I, Parker"'
Publikováno v:
Fertility and sterility. 64(1)
To determine causes of "idiopathic" infertility, the IVF-ET experience of three cohorts of couples with this diagnosis was examined.Three cohorts of idiopathic infertility couples undergoing IVF-ET: a "failed IUI" group, three previous controlled ova
Autor:
J. I. Parker, J. G. Ferrante
Publikováno v:
SIL Proceedings, 1922-2010. 20:324-328
Publikováno v:
Journal of the Fisheries Research Board of Canada. 34:545-551
We measured the concentration of diatom frustules and amorphous silicon per gram of dry sediment at 5-m intervals in the upper water column (0–40 m), in sediment traps placed at 37 and 60 m below the surface, and in a sediment core. The average con
Publikováno v:
Journal of Great Lakes Research. 7:215-223
Two 3-week experiments with small enclosures were conducted in situ in northeastern Green Bay, Lake Michigan, to compare the effects of separate and combined additions of cadmium and zinc on the zooplankton community. The radioisotopes 109Cd and 65Zn
Publikováno v:
Journal of the Fisheries Research Board of Canada. 34:537-544
Depth profiles of dissolved reactive silicon and amorphous particulate silicon were made at monthly intervals (April–November 1975) at stations along a southwest transect from Grand Haven, Michigan, to a point approximately in the center of the sou
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 38:1209-1214
Four in situ experiments with small-volume (28-L) enclosures were conducted in Experimental Lakes Area Lake 382 to assess the effects of inorganic mercury and cadmium on the plankton community. Additions of 0.9 × 10−8 mol Cd/L caused significant r
Publikováno v:
Journal of Great Lakes Research. 8:520-531
Recent estimates suggest that inputs of Zn and Cd to southern Lake Michigan exceed losses. We investigated the sorption and sedimentation of Zn and Cd by southern Lake Michigan seston particles using 65Zn and 109Cd in 21 radiotracer experiments. The
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 40:1469-1479
We conducted four in situ experiments in the southern basin of Lake Michigan to determine the responses of the plankton community to additions of cadmium (3 μg/L) and zinc (15, 30, 60, and 90 μg/L) as well as the bioaccumulation of zinc by differen
Autor:
J. I. Parker, David N. Edgington
Publikováno v:
Limnology and Oceanography. 21:887-893
The concentration of diatom frustules was determined in 14 sediment cores that were dated by /sup 210/Pb and /sup 137/Cs techniques. The concentration in the 0--0.5-cm sediment layer varied from 6.31 x 10/sup 5/ to 3.71 x 10/sup 7/ frustules g dry wt
Autor:
J. I. Parker, J. G. Ferrante
Publikováno v:
Limnology and Oceanography. 22:92-98
Zooplankton fecal pellets cxpellcd near the surface of lakes provide a mechanism for removal of diatoms to deeper water. Scanning electron micrographs show that copepod fecal pellets, collected from Lake Michigan, contained fractured specimens of 21