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.

Analysis, Usage, Electron microscopy, Colloids, Atomic force microscopy, Polysaccharides, Biomolecules, Sea-water, Seawater

---

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.

Water, Composition, Sulfur, Voltammetry

---

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.

United States, Oceanographic research, Shrimps, Shrimps (Animals)

Similar abstracts:

• Abstracts: Microfibrous quartz varieties: characterization by quantitative X-ray texture analysis and transmission electron microscopy
• Abstracts: Abundance and properties of dissolved organic matter in pore waters of a freshwater wetland. Dissolved inorganic carbon profiles and fluxes determined using pH and PCO2 microelectrodes
• Abstracts: Amino acids and hexosamines as indicators of organic matter degradation state in North Sea sediments. The role of adsorption in sediment-water exchange of phosphate in North Sea continental margin sediments
• Abstracts: Acetogenesis from CO(sub.2) in an anoxic marine sediment. Photochemical transformations of surface and deep marine dissolved organic matter: effects on bacterial growth
• Abstracts: Photochemically produced carboxylic acids as substrates for freshwater bacterioplankton. Relaxation of phosphorus limitation due to typhoon-induced mixing in two morphologically distinct basins of Lake Biwa, Japan

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.