Fire-mediated effects of shrubs, lichens and herbs on the demography of Hypericum cumulicola in patchy Florida scrub

Oecologia ◽  
1997 ◽  
Vol 112 (2) ◽  
pp. 263-271 ◽  
Author(s):  
Pedro F. Quintana-Ascencio ◽  
Marina Morales-Hernández
Keyword(s):  
Florida Scrub ◽  
Mediated Effects ◽  
Hypericum Cumulicola

Hypericum cumulicola demography in unoccupied and occupied Florida scrub patches with different time-since-fire

1998 ◽  
Vol 86 (4) ◽  
pp. 640-651 ◽  
Author(s):  
Pedro F. Quintana-Ascencio ◽  
Rebecca W. Dolan ◽  
Eric S. Menges
Keyword(s):  
Florida Scrub ◽  
Time Since Fire ◽  
Hypericum Cumulicola

Outcrossing effects on the reproductive performance of Hypericum cumulicola, an endangered Florida scrub endemic1

2005 ◽  
Vol 132 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Matthew D. Trager ◽  
Eric S. Menges ◽  
Pedro F. Quintana-Ascencio ◽  
Carl W. Weekley
Keyword(s):  
Reproductive Performance ◽  
Florida Scrub ◽  
Hypericum Cumulicola

scholarly journals Genetic Variation in Past and Current Landscapes: Conservation Implications Based on Six Endemic Florida Scrub Plants

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Eric S. Menges ◽  
Rebecca W. Dolan ◽  
Roberta Pickert ◽  
Rebecca Yahr ◽  
Doria R. Gordon
Keyword(s):  
Genetic Variation ◽  
Population Size ◽  
Polymorphic Locus ◽  
Florida Scrub ◽  
Conservation Implications ◽  
Genetic Patterns ◽  
Population Sizes ◽  
Two Measures ◽  
Hypericum Cumulicola ◽  
Suitable Habitats

If genetic variation is often positively correlated with population sizes and the presence of nearby populations and suitable habitats, landscape proxies could inform conservation decisions without genetic analyses. For six Florida scrub endemic plants (Dicerandra frutescens, Eryngium cuneifolium, Hypericum cumulicola, Liatris ohlingerae, Nolina brittoniana, and Warea carteri), we relate two measures of genetic variation, expected heterozygosity and alleles per polymorphic locus (APL), to population size and landscape variables. Presettlement areas were estimated based on soil preferences and GIS soils maps. Four species showed no genetic patterns related to population or landscape factors. The other two species showed significant but inconsistent patterns. ForLiatris ohlingerae, APL was negatively related to population density and weakly, positively related to remaining presettlement habitat within 32 km. ForNolina brittoniana, APL increased with population size. The rather weak effects of population area/size and both past and current landscape structures suggest that genetic variation needs to be directly measured and not inferred for conservation planning.

Protective Effect of Vitamin E on Immune Triggered, Granulocyte Mediated Endothelial Injury

1984 ◽  
Vol 51 (01) ◽  
pp. 089-092 ◽  
Author(s):  
M A Boogaerts ◽  
J Van de Broeck ◽  
H Deckmyn ◽  
C Roelant ◽  
J Vermylen ◽  
...  
Keyword(s):  
Vitamin E ◽  
Protective Effect ◽  
Umbilical Vein ◽  
Endothelial Damage ◽  
Endothelial Injury ◽  
Mediated Effects ◽  
Anti Oxidant ◽  
Endothelial Cell Cultures ◽  
Vitro Model

SummaryThe effect of alfa-tocopherol on the cell-cell interactions at the vessel wall were studied, using an in vitro model of human umbilical vein endothelial cell cultures (HUEC). Immune triggered granulocytes (PMN) will adhere to and damage HUEC and platelets enhance this PMN mediated endothelial injury. When HUEC are cultured in the presence of vitamin E, 51Cr-leakage induced by complement stimulated PMN is significantly decreased and the enhanced cytotoxicity by platelets is completely abolished (p <0.001).The inhibition of PMN induced endothelial injury is directly correlated to a diminished adherence of PMN to vitamin E- cultured HUEC (p <0.001), which may be mediated by an increase of both basal and stimulated endogenous prostacyclin (PGI2) from alfa-tocopherol-treated HUEC (p <0.025). The vitamin E-effect is abolished by incubation of HUEC with the irreversible cyclo-oxygenase inhibitor, acetylsalicylic acid, but the addition of exogenous PGI2 could not reproduce the vitamin E-mediated effects.We conclude that vitamin E exerts a protective effect on immune triggered endothelial damage, partly by increasing the endogenous anti-oxidant potential, partly by modulating intrinsic endothelial prostaglandin production. The failure to reproduce vitamin E-protection by exogenously added PGI2 may suggest additional, not yet elucidated vitamin E-effects on endothelial metabolism.

Cannabinoid Cb1 receptor-mediated effects on white and brown adipocytes

2006 ◽  
Vol 114 (S 1) ◽  
Author(s):  
N Perwitz ◽  
B Meier ◽  
M Drenckhan ◽  
M Fasshauer ◽  
J Klein
Keyword(s):  
Cb1 Receptor ◽  
Cannabinoid Cb1 Receptor ◽  
Brown Adipocytes ◽  
Mediated Effects
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