Erratum to “Changes in the structure and ultrastructure of the intestine of Spadella cephaloptera (Chaetognatha) during feeding and starvation experiments”

2001 ◽  
Vol 256 (2) ◽  
pp. 291-292
Author(s):  
Yvan Perez ◽  
Jean-Paul Casanove ◽  
Jaques Mazza
Keyword(s):  
Spadella Cephaloptera ◽  
Structure And Ultrastructure

Effects of the pseudomonad phytotoxin coronatine on tomato leaf structure and ultrastructure

1995 ◽  
Vol 53 ◽  
pp. 862-863
Author(s):  
D.A. Palmer ◽  
C.L. Bender
Keyword(s):  
Pseudomonas Syringae ◽  
Membrane Integrity ◽  
Leaf Tissue ◽  
Cell Number ◽  
Cell Ultrastructure ◽  
Response To Treatment ◽  
Prominent Symptom ◽  
Chlorophylls A And B ◽  
Cell Dimensions ◽  
Structure And Ultrastructure

Coronatine is a non-host-specific phytotoxin produced by several members of the Pseudomonas syringae group of pathovars. The toxin acts as a virulence factor in P. syringae pv. tomato, allowing the organism to multiply to a higher population density and develop larger lesions than mutant strains unable to produce the toxin. The most prominent symptom observed in leaf tissue treated with coronatine is an intense spreading chlorosis; this has been attributed to a loss of chlorophylls a and b in tobacco. Coronatine's effects on membrane integrity and cell ultrastructure have not been previously investigated. The present study describes changes in tomato leaves in response to treatment with purified coronatine, infection by a coronatine-producing strain of P. syringae pv. tomato, and infection by a cor" mutant.In contrast to H2O-treated tissue, coronatine-treated tissue showed a diffuse chlorosis extending approximately 5 mm from the inoculation site. Leaf thickness, cell number, and cell dimensions were similar for both healthy and coronatine-treated, chlorotic tissue; however, the epidermal cell walls were consistently thicker in coronatine-treated leaves (Figs, la and lb).

The innervation of toad lymph hearts: An ultrastructural study

1992 ◽  
Vol 50 (1) ◽  
pp. 898-899
Author(s):  
A.M. Pucci ◽  
C. Fruschelli ◽  
A. Rebuffat ◽  
M. Guarna ◽  
C. Alessandrini ◽  
...  
Keyword(s):  
Ultrastructural Study ◽  
Neuromuscular Junctions ◽  
Nerve Fibers ◽  
Lack Of Information ◽  
Lymph Heart ◽  
Muscular Pump ◽  
Structure And Ultrastructure ◽  
Heart Wall

Amphibians have paired muscular pump organs, called “lymph heart”, which rhythmically pump back the lymph from the large subcutaneous lymph sacs into the veins. The structure and ultrastructure of these organs is well known but to date there is a lack of information about the innervation of lymph hearts. Therefore has been carried out an ultrastructural study in order to study the distribution of the nerve fibers, and the morphology of the neuromuscular junctions in the lymph heart wall.

scholarly journals Posterior Respiratory Apparatus of Inia geoffrensis and Sotalia fluviatilis: Structure and Ultrastructure

2017 ◽  
Vol 35 (4) ◽  
pp. 1582-1589
Author(s):  
Luzivaldo Castro dos Santos Júnior ◽  
Miriam Marmontel ◽  
Francisco Glauco de Araújo Santos ◽  
Rose Eli Grassi Rici ◽  
Maria Angélica Miglino ◽  
...  
Keyword(s):  
Inia Geoffrensis ◽  
Respiratory Apparatus ◽  
Sotalia Fluviatilis ◽  
Structure And Ultrastructure

Structure and Ultrastructure

2019 ◽  
pp. 17-42
Author(s):  
S. J. Ball ◽  
Robert Michael Pittilo
Keyword(s):  
Structure And Ultrastructure

scholarly journals The differential expression of ribosomal 18S RNA paralog genes from the chaetognath Spadella cephaloptera

2007 ◽  
Vol 12 (4) ◽  
Author(s):  
Roxane-Marie Barthélémy ◽  
Michel Grino ◽  
Pierre Pontarotti ◽  
Jean-Paul Casanova ◽  
Eric Faure
Keyword(s):  
Physiological Role ◽  
Class Ii ◽  
Class I ◽  
Rrna Genes ◽  
Whole Body ◽  
Rrna Gene ◽  
28S Rrna ◽  
Cellular Functions ◽  
Intraindividual Variation ◽  
Spadella Cephaloptera

AbstractChaetognaths constitute a small marine phylum of approximately 120 species. Two classes of both 18S and 28S rRNA gene sequences have been evidenced in this phylum, even though significant intraindividual variation in the sequences of rRNA genes is unusual in animal genomes. These observations led to the hypothesis that this unusual genetic characteristic could play one or more physiological role(s). Using in situ hybridization on the frontal sections of the chaetognath Spadella cephaloptera, we found that the 18S Class I genes are expressed in the whole body, with a strong expression throughout the gut epithelium, whereas the expression of the 18S Class II genes is restricted to the oocytes. Our results could suggest that the paralog products of the 18S Class I genes are probably the “housekeeping” 18S rRNAs, whereas those of class II would only be essential in specific tissues. These results provide support for the idea that each type of 18S paralog is important for specific cellular functions and is under the control of selective factors.

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