Flask cells and flask-shaped glandular cells of amphibian skin specifically produce fucose-rich glycoproteins

1993 ◽  
Vol 99 (5) ◽  
pp. 363-367 ◽  
Author(s):  
J. M. Villalba ◽  
J. M. Roldán ◽  
P. Navas
Keyword(s):  
Amphibian Skin ◽  
Glandular Cells

Occurrence and Development of a Dorsal Gland in the Leaves of Twelve Cultivars of Ficus benjamina L. (Weeping Fig)

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 537b-537
Author(s):  
Svoboda V. Pennisi ◽  
Dennis B. McConnell ◽  
Richard W. Henley
Keyword(s):  
Leaf Size ◽  
Dark Spot ◽  
Ficus Benjamina ◽  
Axis Parallel ◽  
Glandular Cells ◽  
Phenolic Substances ◽  
Dark Color ◽  
Columnar Cells ◽  
Dorsal Gland ◽  
Colorimetric Reaction

Ficus benjamina plants are an integral part of most modern interior landscapes. Reports from growers and interiorscape managers have drawn attention to a specific problem related to large F. benjamina plants, namely the occurrence of a dark oval spot on the abaxial surface of the leaf base. Twelve cultivars of F. benjamina were examined: Christine, Citation, Florida Spire, Kelly, Kiki, Midnight, Monique, Stacey, Wintergreen, Dwarf Nikita, Spearmint, and Starlight. Anatomically, the dorsal gland consisted of one to several layers of densely stained, columnar cells. Positive colorimetric reaction for phenolics was obtained in the glandular cells. Developmentally, the gland cells could not be distinguished from the regular epidermal cells until ≈30% of final leaf size was reached. The cells of the outermost glandular layer changed shape from rectangular with long axis parallel to the leaf surface to elongate with long axis perpendicular to the surface. In a mature leaf, the thickness of the glandular layer was between 20 and 30 μm. Externally, at this stage, no dark spot, indicative of the gland's location, could be observed. In older leaves, however, an accumulation of phenolic substances led to appearance of dorsal dark spot. All cultivars possessed glandular layer. However, this area did not darken in all cultivars; Christine, Citation, Florida Spire, Kelly, Kiki, and Stacey developed small dark spots, while Dwarf Nikita and Starlight had numerous, well-pronounced glandular regions. This study showed that the dark spots in F. benjamina cultivars were a normal morphological feature. Although the gland was present in every cultivar, only a few cultivars developed a dark color.

Bicarbonate and CO2 transport across the skin of the leopard frog, Rana pipiens: effect of PGF2alpha

1997 ◽  
Vol 272 (2) ◽  
pp. R640-R647 ◽  
Author(s):  
O. A. Candia ◽  
T. Yorio
Keyword(s):  
Methodological Approach ◽  
Transport Processes ◽  
Leopard Frog ◽  
Bicarbonate Transport ◽  
Amphibian Skin ◽  
Acid Base ◽  
Reliable Determination ◽  
Net Flux ◽  
Unidirectional Fluxes

The amphibian skin represents an important organ for osmoregulation and, like the mammalian kidney, maintains acid-base balance by secreting protons or base. However, the lack of a reliable and accurate method to measure the contribution of unidirectional fluxes of HCO3- ions to this mechanism has been an obstacle for the determination of the role of bicarbonate in epithelial acid-base homeostasis. Recently, one of us developed a method that allows for the reliable determination of transepithelial fluxes of bicarbonate, and this method was applied to determine unidirectional fluxes of (14)CO2 and H(14)CO3 under a variety of conditions. We report that the combined CO2 and HCO3- mucosal-to-serosal flux under 5% CO2 was 40% larger than the opposing flux, giving a net flux in the mucosal-to-serosal direction. This net flux was inhibited by acetazolamide. In CO2-free conditions, there was no detectable net flux; however, acetazolamide and PGF(2alpha) attenuated the mucosal-to-serosal flux and established an apparent secretion of HCO3-. A model is presented that depicts twelve vectors or components to the CO2 plus HCO3- fluxes in the frog skin. This model can accurately reproduce the experimental values measured from unidirectional fluxes of CO2 and HCO3- under a variety of conditions and can explain the effects of PGF(2alpha) on unidirectional 14C-labeled fluxes as a consequence of inhibition of H+ secretion to the apical bath, similar to what was previously suggested by our laboratory using a different methodological approach. The present method, utilizing radiolabeled HCO3-, may be useful as a means to evaluate the mechanism of action of hormones and drugs that may regulate acid-base homeostasis by altering proton and bicarbonate transport processes.

Incidence of Atypical Glandular Cells of Uncertain Significance in Cervical Cytology Following Introduction of the Bethesda System

1997 ◽  
Vol 67 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Gary L. Eddy ◽  
Serdar H. Ural ◽  
Kenneth B. Strumpf ◽  
Martha A. Wojtowycz ◽  
Pamela S. Piraino ◽  
...  
Keyword(s):  
Cervical Cytology ◽  
Uncertain Significance ◽  
Glandular Cells ◽  
Atypical Glandular Cells ◽  
Bethesda System ◽  
The Bethesda System

scholarly journals PHARMACOLOGICAL DATA ON DERMORPHINS, A NEW CLASS OF POTENT OPIOID PEPTIDES FROM AMPHIBIAN SKIN

1981 ◽  
Vol 73 (3) ◽  
pp. 625-631 ◽  
Author(s):  
M. BROCCARDO ◽  
V. ERSPAMER ◽  
G. FALCONIERI ◽  
G. IMPROTA ◽  
G. LINARI ◽  
...  
Keyword(s):  
Opioid Peptides ◽  
Amphibian Skin ◽  
New Class ◽  
Pharmacological Data

Does Chytridiomycosis Disrupt Amphibian Skin Function?

Copeia ◽  
2010 ◽  
Vol 2010 (3) ◽  
pp. 487-495 ◽  
Author(s):  
Scott Carver ◽  
Ben D. Bell ◽  
Bruce Waldman
Keyword(s):  
Amphibian Skin ◽  
Skin Function

Hormone, opioid and other peptides from amphibian skin

1992 ◽  
Vol 40 (2) ◽  
pp. 188
Author(s):  
Günther Kreil
Keyword(s):  
Amphibian Skin

Ultrastructure of scent glands in larvae of Apateticus bracteatus (Hemiptera: Pentatomidae) and chemical composition of the secretion

1980 ◽  
Vol 58 (11) ◽  
pp. 2105-2115 ◽  
Author(s):  
Jean Percy ◽  
J. A. MacDonald ◽  
J. Weatherston
Keyword(s):  
Chemical Composition ◽  
Interstitial Cells ◽  
Secretory Cells ◽  
Scent Glands ◽  
Volatile Constituents ◽  
Dorsal Wall ◽  
Anterior Dorsal ◽  
Glandular Cells ◽  
Gland Function ◽  
Dorsal Abdominal Glands

The three dorsal abdominal glands in larvae of Apateticus bracteatus (Pentatomidae) secrete a mixture of compounds. Major volatile constituents of the secretion are identified, herein, as tridecane and 2-octenal. There are also trace amounts of 2-hexenal and two other unidentified compounds.Each of the glands has paired orifices that are located between tergites 3/4, 4/5, and 5/6, but only the most anterior gland is paired. In anterior glands of midinstar larvae, glandular cells associated with ducts, and interstitial glandular cells are distributed along the ventral walls of the reservoirs. In posterior glands, columnar glandular cells are located in the anterior dorsal wall of the reservoirs; secretory cells associated with ducts, and nonglandular interstitial cells are distributed throughout the ventral and posterior walls of the reservoirs. The interstitial glandular cells of the anterior gland and the columnar glandular cells of the middle and posterior glands contain cytoplasmic organelles characteristic of lipid-producing cells. In all glands the secretory cells associated with ducts secrete lipids. Evidence indicating the importance of Golgi and ER in secretion synthesis is presented. The reservoirs and ducts have a thin cuticular lining.The bearing of the results on present ideas of gland function in Heteroptera is discussed.

Effects of environmental O2 on blood flow and diffusing capacity in amphibian skin

1989 ◽  
Vol 76 (2) ◽  
pp. 229-241 ◽  
Author(s):  
Gary M. Malvin ◽  
Michael P. Hlastala
Keyword(s):  
Blood Flow ◽  
Diffusing Capacity ◽  
Amphibian Skin

Glandular Cells in Vaginal Smears from Posthysterectomy Patients

1997 ◽  
Vol 41 (6) ◽  
pp. 1701-1704 ◽  
Author(s):  
Brent Ponder ◽  
Kevin O. Easley ◽  
Rosa M. Dávila
Keyword(s):  
Vaginal Smears ◽  
Glandular Cells
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