scholarly journals The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish Rhamdia quelen

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Laura Luchini ◽  
Gustavo Wicki ◽  
Luis Alberto Romano
Keyword(s):  
Pancreatic Islets ◽  
Islets Of Langerhans ◽  
Secretory Cells ◽  
South American ◽  
The South ◽  
Electron Densities ◽  
Outer Portion ◽  
Rhamdia Quelen

The present work shows that a detailed description of the ultrastructure of the secretory cells of the South American catfish Rhamdia quelen pancreatic islets is presented. Evidence is offered to support the contention that the α-granules consist of a central and an outer portion of different electron densities and solubilities, that the δ-cells are most probably morphologically altered but viable α-cells, and that the β-granules possibly possess a repeating substructure and may therefore represent an intracellular crystalline storage form of insulin.

Triploidy induction by cold shock in the South American catfish, Rhamdia quelen (Siluriformes) (Quoy & Gaimard, 1824)

Aquaculture ◽  
2007 ◽  
Vol 272 ◽  
pp. S110-S114 ◽  
Author(s):  
Fábio Soller Dias da Silva ◽  
Renata Guimarães Moreira ◽  
Carlos Robinson Orozco-Zapata ◽  
Alexandre Wagner Silva Hilsdorf
Keyword(s):  
Cold Shock ◽  
South American ◽  
The South ◽  
Rhamdia Quelen ◽  
Triploidy Induction

scholarly journals Preference for microhabitat by Monogenea on the gills of the south american catfish Rhamdia quelen at different stocking densities under laboratory conditions

2016 ◽  
Vol 53 (1) ◽  
pp. 55-61 ◽  
Author(s):  
J. A. Debortoli ◽  
A. C. F. Lacerda ◽  
T. R. Lisboa ◽  
M. L. Martins
Keyword(s):  
Parasitic Infection ◽  
Stocking Density ◽  
Abundant Species ◽  
South American ◽  
Dorsal Region ◽  
The South ◽  
Microhabitat Preference ◽  
Laboratory Conditions ◽  
Rhamdia Quelen

SummaryThis study aimed to verify preferences for microhabitat by the monogeneans on the gills of the south american catfish, Rhamdia quelen (Quoy & Gaimard, 1824), at different stocking densities under controlled laboratory conditions. Three stocking densities were used: 14, 28 and 42 fish per tank (50 L) and the fish were sampled initially, at day 5 and 10 of the experiment. Aphanoblastella mastigatus (Suriano, 1986) was noted as the most abundant species at all stocking densities, except for the initial collection day. The gill arches I and II were the most parasitized, showing the highest mean abundance in the dorsal region, at the highest density. The pattern of microhabitat preference of A. mastigatus for outer regions of the gills of the host was independent of the stocking density and collection day. Higher prevalence and abundance of Scleroductus sp. at the initial collection reflected the parasitic infection of the fish at the farm from where the fish were taken. The abundance of Scleroductus sp. decreased along the experiment, and no preference for gill arches was recorded for the species, probably due to the low abundance of this parasite on the gills.

scholarly journals Short Communication Sequence analysis of the growth hormone gene of the South American catfish Rhamdia quelen

2010 ◽  
Vol 9 (4) ◽  
pp. 2184-2190 ◽  
Author(s):  
B.S. Vaz ◽  
G.M. Cerqueira ◽  
J.C. Silva ◽  
V.H.B. Manzke ◽  
C.G.A. Moreira ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Sequence Analysis ◽  
Short Communication ◽  
Growth Hormone Gene ◽  
South American ◽  
The South ◽  
Rhamdia Quelen

Fine structure of the venom gland epithelium of the south american rattlesnake and radioautographic studies of protein formation by the secretory cells

1973 ◽  
Vol 138 (1) ◽  
pp. 79-119 ◽  
Author(s):  
H. Warshawsky ◽  
A. Haddad ◽  
R. P. Gonçalves ◽  
V. Valeri ◽  
F. L. De Lucca
Keyword(s):  
Fine Structure ◽  
Venom Gland ◽  
Secretory Cells ◽  
South American ◽  
The South

Cnidochloa: A New Genus of Grasses from Brazil (Poaceae: Panicoideae: Paniceae)

2020 ◽  
Vol 105 (2) ◽  
pp. 183-194
Author(s):  
Fernando O. Zuloaga ◽  
Sandra S. Aliscioni ◽  
M. Amalia Scataglini
Keyword(s):  
New Genus ◽  
Phylogenetic Position ◽  
South American ◽  
The South ◽  
South American Species ◽  
Molecular Characters

Generic boundaries of the South American species Panicum longipedicellatum Swallen are explored and compared with allied genera of the tribe Paniceae. On the basis of morphological, anatomical, and molecular characters a new genus, Cnidochloa Zuloaga, is proposed. The phylogenetic position of the new genus within the Paniceae is evaluated.

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