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Arsenic in streams, stream sediments, and ground water, fairbanks area, alaska (1978)

Wilson, F. H. ; Hawkins, D. B.

Springer

Environmental geology 2 (1978), S. 195-202

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Details

ISSN: 1432-0495

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie

Notizen: Abstract Arsenic concentrations of less than 5 ppb to as large as 1,260 ppb in stream waters and from 5 ppm to 4,000 ppm in stream sediments were found in the Pedro Dome-Cleary Summit area, Alaska. Waters from three of 20 wells sampled had arsenic concentrations exceeding the U.S. Public Health Service recommended limit of 50 ppb. The high arsenic levels are a consequence of arsenic enrichment in the rocks of the area. Placer and lode-gold mining may increase the arsenic content of the waters by exposing arsenic-containing rocks to surface waters and by increasing the load of arsenic-rich sediments in the streams. Finding these disturbingly large concentrations of arsenic in the waters of the Fairbanks area was the major result of this work, inasmuch as a subsequent study (to be published) revealed arsenic concentrations as large as 10 ppm in domestic wells and prompted an extensive study by Federal and State agencies of the health hazard posed by these arsenic-rich waters.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02380485

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Digitale Medien

The segmentation of the abdomen of Lipeurus heterographus Nitzsch (Mallophaga)Contribution from the Department of Entomology, New York State College of Agriculture, Cornell University, Ithaca, New York and the Department of Zoology, Tulane University of Louisana, New Orleans, Louisana. (1936)

Wilson, F. H.

New York, NY : Wiley-Blackwell

Journal of Morphology 60 (1936), S. 211-219

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Eleven segments are recognized in a comparative study of the abdomens in immature and adult instars of Lipeurus heterographus Nitzsch.The abdomen of the first instar appears ten segmented but with the apparent first segment twice as long as any one of the others and with two transverse rows of hairs on the tergum while the other abdominal segments have but one. This indicates that the apparent first segment is the true first and second abdominal segments which have fused. The apparent tenth segment of the abdomen is the true eleventh segment. A fusion of the true ninth and tenth segments occurring in the third molt further reduces the number of segments to nine which is the apparent number of segments found in the adult.

Zusätzliches Material: 5 Ill.