The surfaces of rhabdosomes in dendroid and tuboid graptolites and in Mastigo-graptus were investigated with SEM. In general the surfaces are remarkably smooth and essentially featureless, even around the apertures. The only exception are SUbparallel rollers recognized on one specimen of Dictyonema sp., which pass at places into accumulations producing a reticulated network. The evidence available indicates a foreign nature these structures which cannot be considered units of secretion of graptolite cortex. The opinion is advanced that the recent data are suggestive of collagen fibrillogenesis occuring immediately adjacent to the surface coat of epithelial cells. The lack of bandages in sessile graptolites and the lack of foreign agglutinat...
Direct visualization of the skin barrier formation process by cryotransmission electron microscopy o...
Graduation date: 1963The epidermis of the brook lamprey, Lampetra planers\ud (Bloch), has been exami...
Les structures recouvrant la surface de nombreux organismes présentent des organisations fibrillaire...
The surfaces of rhabdosomes in dendroid and tuboid graptolites and in Mastigograptus were investigat...
Dissepiments or connecting bars between adjacent stipes in rhabdosomes of dendroid graptolites were ...
Abstract.- Scanning electron microscope studies of well preserved, isolated grap-tolites have reveal...
Abstract.- The ultrastructure of the organic coenecium in living Cephalodiscus (Cephalodiscus) inaeq...
The ultrastructure of the dendroid genera Acanthograptus, Dendrograptus, Desmograptus, Ptilograptus ...
The ultrastructure of the dendroid genera Acanthograptus, Dendrograptus, Desmograptus, Ptilograptus ...
The lamina densa of normal human epidermis was exposed by treatment with 1M sodium chloride and was ...
The graptoloid prosicula (conus and cauda) forms the first part of the growing colony, and was proba...
Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved i...
Fragments of rhabdosomes isolated by chemical treatment from an erratic boulder of Baltic origin and...
Abstract.- Investigation of retiolite-type rhabdosomes has so far revealed two contrastin~'type...
Although the graptolites lacked biomineralised tissue, their skeletons are abundantly preserved in d...
Direct visualization of the skin barrier formation process by cryotransmission electron microscopy o...
Graduation date: 1963The epidermis of the brook lamprey, Lampetra planers\ud (Bloch), has been exami...
Les structures recouvrant la surface de nombreux organismes présentent des organisations fibrillaire...
The surfaces of rhabdosomes in dendroid and tuboid graptolites and in Mastigograptus were investigat...
Dissepiments or connecting bars between adjacent stipes in rhabdosomes of dendroid graptolites were ...
Abstract.- Scanning electron microscope studies of well preserved, isolated grap-tolites have reveal...
Abstract.- The ultrastructure of the organic coenecium in living Cephalodiscus (Cephalodiscus) inaeq...
The ultrastructure of the dendroid genera Acanthograptus, Dendrograptus, Desmograptus, Ptilograptus ...
The ultrastructure of the dendroid genera Acanthograptus, Dendrograptus, Desmograptus, Ptilograptus ...
The lamina densa of normal human epidermis was exposed by treatment with 1M sodium chloride and was ...
The graptoloid prosicula (conus and cauda) forms the first part of the growing colony, and was proba...
Desmograptus micronematodes from Thornton quarry, Cook County, Illinois, USA, remarkably preserved i...
Fragments of rhabdosomes isolated by chemical treatment from an erratic boulder of Baltic origin and...
Abstract.- Investigation of retiolite-type rhabdosomes has so far revealed two contrastin~'type...
Although the graptolites lacked biomineralised tissue, their skeletons are abundantly preserved in d...
Direct visualization of the skin barrier formation process by cryotransmission electron microscopy o...
Graduation date: 1963The epidermis of the brook lamprey, Lampetra planers\ud (Bloch), has been exami...
Les structures recouvrant la surface de nombreux organismes présentent des organisations fibrillaire...