A reinvestigation of the origin of the peribacteroid membrane in root nodules of Vicia faba

1981 ◽  
Vol 59 (9) ◽  
pp. 1547-1552 ◽  
Author(s):  
William Newcomb ◽  
Susan Creighton ◽  
Lenore Latta
Keyword(s):  
Plasma Membrane ◽  
Vicia Faba ◽  
De Novo ◽  
Root Nodules ◽  
Electron Microscopic ◽  
Peribacteroid Membrane ◽  
Transmission Electron Microscopic Study ◽  
Transmission Electron ◽  
Infection Threads ◽  
Transmission Electron Microscopic

A transmission electron microscopic study of nodules of Vicia faba has demonstrated that rhizobia are released from the infection threads by an endocytotic process. The rhizobia escape from unwalled regions of the infection thread or unwalled droplets of thread matrix and upon escape are surrounded by a peribacteroid membrane which is derived from the plasma membrane bounding the unwalled regions of thread matrix. Thus, the release of bacteria in V. faba nodules is essentially identical to that reported in other leguminous nodules and the peribacteroid membrane does not arise de novo as previously reported by other workers.

The blister of porphyria cutanea tarda: A Scanning and Transmission Electron Microscopic study

1986 ◽  
Vol 44 ◽  
pp. 334-335
Author(s):  
Veronika Burmeister ◽  
R. Swaminathan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Basement Membrane ◽  
Middle Age ◽  
Porphyria Cutanea Tarda ◽  
Minor Trauma ◽  
Electron Microscopic ◽  
Transmission Electron Microscopic Study ◽  
Transmission Electron ◽  
Transmission Electron Microscopic

Porphyria cutanea tarda (PCT) is a disorder of porphyrin metabolism which occurs most often during middle age. The disease is characterized by excessive production of uroporphyrin which causes photosensitivity and skin eruptions on hands and arms, due to minor trauma and exposure to sunlight. The pathology of the blister is well known, being subepidermal with epidermodermal separation, it is not always absolutely clear, whether the basal lamina is attached to the epidermis or the dermis. The purpose of our investigation was to study the attachment of the basement membrane in the blister by comparing scanning with transmission electron microscopy.

scholarly journals Correlative scanning and transmission electron microscopic study on the ependymal surface of Cebus apella

1986 ◽  
Vol 44 (4) ◽  
pp. 334-340 ◽  
Author(s):  
Cáudio A. Ferraz de Carvalho ◽  
II-Sei Watanabe ◽  
Romeu Rodrigues de Souza
Keyword(s):  
Electron Microscope ◽  
Cebus Apella ◽  
Gold Coating ◽  
Electron Microscopic ◽  
Transmission Electron Microscopic Study ◽  
Morphological Findings ◽  
Transmission Electron ◽  
Critical Point Drying ◽  
Transmission Electron Microscopic ◽  
Brain Ventricular System

Topographical variations of the ependymal surface of the whole brain ventricular system of Cebus apella, a wild Brazilian species, were studied at the scanning electron microscope after C02 critical point drying and carbon-gold coating. Certain selected areas were also studied at the transmission electron microscope, following standard technical procedures. We observed distinct patterns in the distribution of cilia, microvilli, other cell projections, and the so called supraependymal structures. Based on the morphological findings, functional considerations are made.

Transmission electron microscopic study of antennal sensilla of the female black fly, Simulium arcticum (IIL-3; IIS-10.11) (Diptera: Simuliidae)

1990 ◽  
Vol 68 (7) ◽  
pp. 1443-1453 ◽  
Author(s):  
J. F. Sutcliffe ◽  
E. G. Kokko ◽  
J. L. Shipp
Keyword(s):  
Electron Micrographs ◽  
Host Location ◽  
Scanning Electron Micrographs ◽  
Antennal Sensilla ◽  
Electron Microscopic ◽  
Olfactory Sensilla ◽  
Transmission Electron Microscopic Study ◽  
Sensilla Trichodea ◽  
Transmission Electron ◽  
Transmission Electron Microscopic

The innervation and internal ultrastructure of the antennal flagellar sensilla of female Simulium arcticum (cytotypes IIL-3 and IIS-10.11) are described from transmission electron micrographs. Two types of contact chemosensilla and at least four types of olfactory sensilla (sensilla trichodea, two or more types of sensilla basiconica, grooved pegs) were found. These correspond to sensillar types previously described from scanning electron micrographs of the antennae of these species. In addition, possible thermo- and hygro-receptive sensilla coeloconica are described from the antennal tip. The sensory complement of the simuliid antenna is compared with those of certain other dipterans, and possible roles of these sensilla in host location and other behaviours are discussed.

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