Community structure of filamentous, sheath-building sulfur bacteria, Thioploca spp., off the coast of Chile

Article Abstract:

Three different size classes of sheath-building sulfur bacteria Thioploca spp. are present off the coast of Chile. Thioploca sheaths occur over the whole shelf area where oxygen levels are low, and many Thioploca filaments lack a visible sheath. The highest wet weight of the sheaths is at a depth of 90 m, with the bacterial filaments making up approximately 10% of the weight. The upper 1 cm of the bacterial mat contains the maximum density of filaments. The three-dimensional sheath structure indicates that Thioploca filaments are able to move from the top to the bottom of the sediments.

Chile, Environmental aspects, Bacteria, Marine bacteria, Bacterial motility

---

Nitrogen, carbon, and sulfur mechanism in natural Thioploca samples

Article Abstract:

Filamentous sulfur bacteria of the genus Thioploca are found as dense mats on the continental shelf off the coast of Chile and Peru. It has been suggested that these large vacuolated bacteria can oxidize sulfide by reducing their internally stored nitrate. This nitrate reduction was studied by incubation experiments of washed Thioploca sheaths with trichomes in combination with 15N compounds and mass spectrometry. Findings showed that the Thioploca species are facultative chemolithoautotrophs capable of mixotrophic growth.

Microbial metabolism, Carbon, Nitrogen (Chemical element), Sulfur, Nitrogen

---

Ecology of Thioploca spp.: nitrate and sulfur storage in relation to chemical microgradients and influence of Thioploca spp. on the sedimentary nitrogen cycle

Article Abstract:

Researchers document that the sulfide-oxidizing bacterium Thioploca shuttles vertically in marine sediments between NO(sub 3)-rich bottom water and H(sub2)S-containing sediment. Bacteria containing intracellular NO(sub 3)- were found at a depth of 13 cm in sediment cores incubated in the laboratory.

Marine sediments, Bacteriology, Nitrogen cycle

Similar abstracts:

• Abstracts: Antagonistic interactions among marine bacteria impede the proliferation of Vibrio cholerae. Dynamics of bacterial community composition and activity during a mesocosm diatom bloom
• Abstracts: An autoregulatory cascade of EGF receptor signaling patterns the Drosophila egg. A family of rhomboid-like genes: Drosophila rhomboid-1 and roughoid/rhomboid-2 cooperate to activate EGF receptor signaling
• Abstracts: Crystal structure of the delta subunit of the clamp-loader complex of E. colin DNA polymerase III. Mechanism of processivity clamp opening by the delta subunit wrench of the clamp loader complex of E. coli DNA polymerase III
• Abstracts: Control of intrinsic transcription termination by N and NusA: the basic mechanisms. Bacillus subtilis glutamine synthetase controls gene expression through a protein-protein interaction with transcription factor TnrA
• Abstracts: Inducers of plant systematic acquired resistance regulate NPR1 function through redox changes. The C. elegans zyg-1 gene encodes a regulator of centrosome duplication with distinct maternal and paternal roles in the embryo

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