Temporal changes in elemental composition in decomposing filamentous algae (Cladophora glomerata and Pilayella littoralis) determined with PIXE and PIGE

2012 ◽  
Vol 414 ◽  
pp. 646-652 ◽  
Author(s):  
J.-O. Lill ◽  
S. Salovius-Laurén ◽  
L. Harju ◽  
J. Rajander ◽  
K.-E. Saarela ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Temporal Changes ◽  
Filamentous Algae ◽  
Cladophora Glomerata ◽  
Pilayella Littoralis

Effect of Simazine on Photosynthesis and Growth of Filamentous Algae

Weed Science ◽  
1983 ◽  
Vol 31 (6) ◽  
pp. 899-903 ◽  
Author(s):  
Steven W. O'Neal ◽  
Carole A. Lembi
Keyword(s):  
Light Intensity ◽  
Algal Species ◽  
Filamentous Algae ◽  
Cladophora Glomerata ◽  
Light Intensities ◽  
The Relationship ◽  
Algicidal Effects

Simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] inhibited photosynthesis 50% at concentrations of 1.1 μM forSpirogyra jurgensii(Kutz), 3.0 μM forPithophora oedogonia(Mont.) Wittr., and 3.8 μM forCladophora glomerata(L.) Kutz. Photosynthesis ofAnkistrodesmus braunii(Brun.), a nonfilamentous species, was inhibited the same amount by 4.7 μM simazine. The filamentous algal species had significant reductions in growth but no other phytotoxic symptoms when exposed to 5 μM simazine at light intensities of 100 μE·m–2·s–1and below. Algicidal effects did occur at a light intensity of 400 μE·m–2·s–1and were most severe inSpirogyra.The relationship between light intensity and simazine toxicity indicates algicidal effectiveness on these filamentous algae will be limited in habitats where light is reduced by turbidity, depth, or self-shading.

Temporal Changes in Lichen Species Richness and Elemental Composition on a Pennsylvania Atmospheric Deposition Gradient

Evansia ◽  
2012 ◽  
Vol 29 (3) ◽  
pp. 67-73 ◽  
Author(s):  
James R. McClenahen ◽  
Ray E. Showman ◽  
Russell J. Hutnik ◽  
Donald D. Davis
Keyword(s):  
Species Richness ◽  
Atmospheric Deposition ◽  
Elemental Composition ◽  
Temporal Changes ◽  
Lichen Species ◽  
Deposition Gradient

Alterations of ultrastructure and elemental composition in cultured human epidermal keratinocytes after treatment with nitrofurazone and silver sulfadiazine

1987 ◽  
Vol 45 ◽  
pp. 676-677
Author(s):  
A. R. Crooker ◽  
M. C. Myers ◽  
T. L. Beard ◽  
E. S. Graham
Keyword(s):  
Electron Microscopy ◽  
Elemental Composition ◽  
Pyrolytic Carbon ◽  
Human Keratinocytes ◽  
Silver Sulfadiazine ◽  
Epidermal Keratinocytes ◽  
Human Epidermal Keratinocytes ◽  
Culture Systems ◽  
Cytotoxicity Endpoints

Cell culture systems have become increasingly popular as a means of screening toxic agents and studying toxic mechanisms of drugs and other chemicals at the cellular and subcellular levels. These in vitro tests can be conducted rapidly in a broad range of relevant mammalian culture systems; a variety of biological and biochemical cytotoxicity endpoints can be examined. The following study utilized human keratinocytes to evaluate the relative cytotoxicities of nitrofurazone (NF) and silver sulfadiazine (SS), the active ingredients of FURACIN(R) Topical Cream and SILVADENE(R) Cream, respectively. These compounds are anti-infectives used in the treatment of burn patients. Cell ultrastructure and elemental composition were utilized as cytotoxicity endpoints.Normal Human Epidermal Keratinocytes (HK) were prepared from the EpiPackTM culture system (Clonetics Corporation, Boulder, CO). For scanning electron microscopy (SEM) and transmission electron microscopy (TEM), cells were seeded on sterile 35 mm Falcon plastic dishes; for elemental microanalysis, cells were plated on polished pyrolytic carbon discs (E. Fullam, Latham, NY) placed in the culture dishes.

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