Le ghiandole calcifere (ghiandole di Morren) di Eisenia foetida. Studio istoe citochimico

Guardabassi, A.

doi:10.1007/bf00339369

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Many mitochondria, of varying types, are found in the cells of the glands (Myot, 1957;Guardabassi, 1957) and electron microscope studies have confirmed the identity of these structures (van Gansen, van der Meersche and Castiaux, 1959).…”

Section: Calciferous Glandsmentioning

confidence: 95%

The physiology of earthworms

Laverack¹

1963

119

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1956; Watson, 1958), but there is at least one important diflference compared with vertebrate collagen : there is no periodicity of the fibrils at 640 A intervals in either L. terrestrts (Watson and Silvester, 1959), or A. longa (Reed and Rudall, 1948) (Fig. 5). The cuticle is highly proteinaceous in character, some 80% of the total being composed of protein whilst the remaining 20% is made up of polysaccharides, galactose, pentoses and hexosamines (Watson, 1958). Nitrogen accounts for 14-6% of the cuticle weight and at least 16 amino-acids are represented in the protein. The amino-acids of the cuticle of two species, L. terrestrts and A. longa are Hsted in Table 3 where they are compared with a typical vertebrate collagen, that of ox-hide (Watson and Smith, 1956; Watson, 1958; and Singleton, 1957). Amines with non-polar side chains e.g. glycine, are present in quantities similar to those in vertebrate collagen, but arginine, histidine, and lysine with basic side chains are less abundant than in vertebrate material, whilst aspartic acid, glutamic acid and serine (D-serine?) with acidic side chains are present in greater quantities than in the vertebrate counterpart. There is no trace of hydroxylysine in earthworm cuticle. The gizzard of L. terrestrts is lined with a cuticle. This can be removed and Rudall (1955) subjected this material to X-ray analysis, obtaining patterns similar to those of chaetae (see p. 15). Cuticle from this situation is not stable in hot dilute alkali, does not crystallize, and though chitin-like is not in the a-chitin form. The presence of a chitin would be shown by a fibrillar structure, but van Gansen (1959b, 1960) using similar material finds no evidence for the belief that the gizzard lining is fibrillar. Chemical tests with orcein, resorcin, van Gieson stain, benzidine and Gomori stain

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Section: Calciferous Glandsmentioning

confidence: 95%

The physiology of earthworms

Laverack¹

1963

119

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“…The alkaline phosphomonoesterasic ac-substances, and calcified inclusions. tivity is strong and uniform (Guardabassi, 1957).…”

Section: Wormsmentioning

confidence: 99%

Comparative Histoenzymology of the Salivary Glands

Arvy¹

1963

Annals of the New York Academy of Sciences

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“…These authors described a correlation between the activity of the gland cells and the production of calcium carbonate. Guardabassi (1957), in a study of the glands of Eisenia, mentioned the presence of mineralized bodies in the cells, but failed to identify a Golgi complex. He noted the increase in prominence and distribution of mitochondria in the active cell and indicated that this condition was associated with the formation of spheroliths.…”

Section: Introductionmentioning

confidence: 99%

An electron microscope and autoradiographic study of the calciferous glands of the earthworm,Lumbricus terrestris

Nakahara¹,

Bevelander²

1969

Calc. Tis Res.

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The actively-secreting cells of the cMeiferous glands of Lumbricus terrestris are roughly dome shaped. The basal part of the cell consists of numerous interdigitating cell processes. These processes contain numerous mitochondria and membranous infoldings, forming vesicles which migrate to various regions of the cell. The nucleus is irregular and centrally located. The supranuclear region is occupied to a great extent by the rough endoplasmic reticulum, several Golgi complexes and numerous granules derived from the Golgi complexes. These granules enlarge and are extruded into the gland sinus, where they eventually become reorganized and mineralized to give rise to spheroliths.Radioautographs of glands removed 30 rain following injection of 45Ca showed uptake of the isotope located almost exclusively in the cells; 4--24 h later the isotope was located in the spheroliths in the gland cavity.These cells apparently perform two functions necessary for the production of mineralized spheroliths, l, absorption and transport of calcium from the basal region to the cell surface and 2, the elaboration of a protein matrix in which mineralization occurs.

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Le ghiandole calcifere (ghiandole di Morren) di Eisenia foetida. Studio istoe citochimico

Cited by 6 publications

References 15 publications

The physiology of earthworms

The physiology of earthworms

Comparative Histoenzymology of the Salivary Glands

An electron microscope and autoradiographic study of the calciferous glands of the earthworm,Lumbricus terrestris

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