Fibrillar polysaccharides in marine macromolecular organic matter as imaged by atomic force microscopy and transmission electron microscopy
Article Abstract:
Colloids were collected from rivers, estuaries, and waters of the continental shelf and slope of the Gulf of Mexico and Middle Atlantic Bight and imaged with atomic force microscopy and transmission electron microscopy. The two imaging techniques are highly complementary for the study of aquatic macromolecules and colloids. Fibrillar material rich in polysaccharides makes up a significant portion of the colloidal organic matter. Deeper waters have more variety in colloid and macromolecule sizes and shapes.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Voltammetric determination of elemental sulfur in pore waters
Article Abstract:
Square-wave cathodic stripping voltammetry has been used to measure dissolved elemental sulfur (S(0)) in pore waters. Peak current and peak potential change with pH. Interference from thiosulfate, sulfite, and thiols is not significant over a wide pH range, from 2.5 to 11.5. Sulfide interference can be eliminated easily. Natural organic matter should produce minimal fouling effects. An anoxic site of a Shield lake had greater than expected concentrations of S(0) in pore waters.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Comparative bioaccumulation studies of colloidally complexed and free-ionic heavy metals in juvenile brown shrimp Penaeus aztecus (Crustacea: Decapoda: Penaeidae)
Article Abstract:
Much of the trace metal pool in coastal and estuarine waters is complexed with colloidal-sized macromolecular organic matter. Free-ionic dissolved metal ions have generally been utilized by bioaccumulation and bioavailability studies of trace metals. Radiotracers were used in a recent study to observe bioaccumulation. Heavy metals appear to accumulate most often in the hapatopancreas of the juvenile brown shrimp.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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