Peridium of the acellular slime moldFuligo septica: Structure and composition

Chapman, Charles P.; Nelson, Rodney K.; Orlowski, Michael

doi:10.1016/0147-5975(82)90095-0

Cited by 2 publications

(6 citation statements)

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“…Optical, SEM, and TEM images show that the peridia are dominated by 500- to 1500-nm-sized spheres (Figs. 1 , 2 , S1 d), consistent with previous SEM images 29 . The spheres are isotropic under crossed-polarized transmitted light (Fig.…”

Section: Resultssupporting

confidence: 91%

“…Our TG and elemental data are consistent with the bulk HACC of F. septica containing up to 10 wt% organic matter. This quantity is similar to the 10.6 wt% organic matter determined for F. septica by Chapman et al 29 , which is divided between protein (6.8 wt%) and carbohydrates (3.8 wt%). The internal clumping observed by BFTEM in the spheres (Figs.…”

Section: Resultssupporting

confidence: 82%

“…Organic material is present in the peridium and hypothallus of F. septica 29 , 35 . Nelson and Orlowski 35 show a predominance of protein with significant contributions of galactose and galactosamine polymer.…”

Section: Resultsmentioning

confidence: 99%

“…Most notable are the aethalia produced by the cosmopolitan species Fuligo septica 33 , 34 , which can be up to 75 cm across 34 . The calcium carbonate precipitated by slime molds typically occurs as micron- and submicron-sized spheres or euhedral crystals 28 , 29 , 32 , 33 , 35 – 37 , though rarely is the precipitated material characterized, and is variously referred to as “lime” in the literature. For example, Schoknecht 31 employed a scanning electron microscope with x-ray microanalysis to study the calcareous deposits from a range of acellular slime molds: the presence of crystalline versus amorphous CaCO 3 was based on crystal shapes.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Schoknecht 31 employed a scanning electron microscope with x-ray microanalysis to study the calcareous deposits from a range of acellular slime molds: the presence of crystalline versus amorphous CaCO 3 was based on crystal shapes. There is evidence to suggest that the calcium carbonate precipitated by F. septica in the peridium is in part amorphous 29 .…”

Section: Introductionmentioning

confidence: 99%

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An exceptionally stable and widespread hydrated amorphous calcium carbonate precipitated by the dog vomit slime mold Fuligo septica (Myxogastria)

Garvie

Németh

Trif

2022

Sci Rep

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Biogenic amorphous calcium carbonate (ACC) is typically metastable and can rapidly transform through aging, dehydration, and/or heating to crystalline calcium carbonate. Gaining insight into its structure and properties is typically hampered by its tendency to crystallize over short time periods once isolated from the host organism, and also by the small quantities that are usually available for study. Here we describe an exceptionally stable hydrated ACC (HACC) precipitated by the cosmopolitan slime mold Fuligo septica (L.) F.H. Wigg. (1780). A single slime mold can precipitate up to a gram of HACC over the course of one night. Powder x-ray diffraction (XRD) patterns, transmission electron microscopy images, infrared absorption spectra, together with the lack of optical birefringence are consistent with an amorphous material. XRD simulations, supported by thermogravimetric and evolved gas analysis data, are consistent with an intimate association of organic matter with ~ 1-nm-sized ACC units that have monohydrocalcite- and calcite-like nano-structural properties. It is postulated that this association imparts the extreme stability of the slime mold HACC by inhibiting loss of H2O and subsequent crystallization. The composition, structure, and thermal behavior of the HACC precipitated by F. septica collected over 8000 km apart and in markedly different environments, suggests a common structure, as well as similar biochemical and biomineralization mechanisms.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 82%