ARAGONITE CRYSTALS IN <i>SPIROGYRA</i> SP. (CHLOROPHYTA)

Mann, H.; Mann, Stephen; Fyfe, W. S.

doi:10.1111/j.1529-8817.1987.tb02539.x

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…The chemical composition of cruciate inclusions in Spirogyra was characterized as calcium oxalate by Klein (1877), Kamiya (1961), and Knobloch and Kalina (1968), but more recently Mann et al (1987) reported them to be aragonite. Considerable significance was attached to the purported finding of aragonite, being the first report of intracellular aragonite in a freshwater alga (Mann et al 1987).…”

Section: Discussionmentioning

confidence: 97%

“…Numerous authors (Klein 1877;Fischer 1884;Kamiya 1961;Knobloch and Kalina 1968;Mann et al 1987) have reported the presence of cruciate cellular inclusions in Spirogyra, but some of the specimens lacked the reproductive features necessary for definitive species identification. Those that could be identified were Spirogyra setiformis (Roth) Kü tzing (Fischer 1884) and Spirogyra ellipsospora Transeau (Transeau Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Cruciate mineral inclusions have been reported in several species of Spirogyra for more than a century (Klein 1877;Fischer 1884). Most authors believed the inclusions to be composed of calcium oxalate (Klein 1877;Fischer 1884;Kamiya 1961;Knobloch and Kalina 1968), but most recently, Mann et al (1987) to be aragonite, a mineral form of calcium carbonate. Intracellular deposits of aragonite are far less common than calcium oxalate crystals.…”

Section: Introductionmentioning

confidence: 97%

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Calcium Oxalate Crystals in the Green AlgaSpirogyra hatillensis(Zygnematales, Chlorophyta)

Pueschel

2001

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences.Vegetative cells of the freshwater green alga Spirogyra hatillensis Transeau contain numerous cruciate inclusions that are up to 34 mm long. A crystalline nature was shown by birefringence in polarized light. Rather than occurring free in the large central vacuole, these inclusions were associated with cytoplasmic strands that suspended the nucleus in a cytoplasmic embayment of the central vacuole and with the parietal cytoplasm, which contains the spiral chloroplasts. Some crystals moved directionally along the cytoplasmic strands, and their movement was arrested by cytochalasin B, indicating that actin microfilaments had a role in crystal movement. Solubility tests showed that the inclusions were composed of calcium oxalate; they were not soluble in concentrated acetic acid or sodium hypochlorite, but they dissolved rapidly without effervescence in weak hydrochloric acid. The Yasue cytochemical test for calcium oxalate stained the crystals intensely. The crystals were associated with a water-soluble organic matrix that retained the shape of the crystal after demineralization. Scanning electron microscopy showed crystals to have arms with tapered tips and rhombohedral cross sections or with truncated ends and rectangular sections. Crystal growth in the Z-axis occurred at the intersection of the axes as well as at other sites along the arms. Transmission electron microscopy showed the presence of bounding membranes around the mineral inclusions. A colorimetric enzymatic test for oxalate was used to quantify this compound in S. hatillensis, and it was also used in conjunction with microscopic examination. Neutral red was found to accumulate in numerous small vacuoles, up to 2 mm in diameter, that were present in the parietal cytoplasm and in the cytoplasmic strands supporting the nucleus. In filaments undergoing conjugation as part of sexual reproduction, unfused cells contained crystals, but zygotes did not.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Calcium Oxalate Crystals in the Green AlgaSpirogyra hatillensis(Zygnematales, Chlorophyta)

Pueschel

2001

International Journal of Plant Sciences

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“…7). Here, it starts again at the 300 MHz level (r 0 ≈ 1.13 R ) and reaches the 50 MHz level at a height of 0.6 R above the photosphere after approximately 4 s. This motion would cause a type III radio burst with a drift rate of −63 MHz s −1 , which is a reasonable type III drift rate (Mann & Klassen 2002). Because of the decreasing global magnetic field, the Larmor energy is dramatically converted into drift energy (Fig.…”

Section: Numerical Treatment and Discussionmentioning

confidence: 87%

Propagation of energetic electrons through the solar corona and the interplanetary medium

Önel

Mann

Sedlmayr

2006

A&A

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Aims. The electron transport is investigated numerically after an electron transport model is deduced. Methods. This model for electron propagation considers global electric and magnetic fields, as well as local Coulomb collisions. A new way to handle the electron's pitch angle evolution by using a binary dice within the treatment of the Coulomb scattering is introduced. The conditions in the solar plasma are represented by average and commonly used models, such that numerical simulations can be performed easily. Results. The model for electron propagation finally obtained makes it possible to investigate how the Coulomb collisions act on the pitch angle, while electrons are transported through the solar plasma. Some chosen numerical results for different initial conditions are presented in the paper.

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“…Частоту встречаемости видов оценивали по шестибальной шкале (Корде, 1956). Видовую идентификацию проводили с помощью определителей Mann, 1989Mann, , 1999Mann, Stickle, 1991Lange-Bertalot, 1995;LangeBertalot, Metzeltin, 1996;Krammer, 1997Krammer, , 2000Round, Basson, 1997;Zimmermann et al, 2010;Pavlov et al, 2013, и др. ).…”

Section: материалы и методыunclassified

Taxocenosis structure and diversity of diatoms in the littoral zone of Lake Baikal at the confluence of the rivers (Russia)

Pomazkina¹,

Rodionova²

2016

Algologia

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ARAGONITE CRYSTALS IN SPIROGYRA SP. (CHLOROPHYTA)

Cited by 9 publications

References 8 publications

Calcium Oxalate Crystals in the Green AlgaSpirogyra hatillensis(Zygnematales, Chlorophyta)

Calcium Oxalate Crystals in the Green AlgaSpirogyra hatillensis(Zygnematales, Chlorophyta)

Propagation of energetic electrons through the solar corona and the interplanetary medium

Taxocenosis structure and diversity of diatoms in the littoral zone of Lake Baikal at the confluence of the rivers (Russia)

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