Carbohydrates in the hypothallus and areolae of the crustose lichen Rhizocarpon geographicum (L.) DC.

Symbiosis ◽  
2009 ◽  
Vol 49 (2) ◽  
pp. 95-100 ◽  
Author(s):  
R.A. Armstrong ◽  
S.N. Smith
Keyword(s):  
Crustose Lichen ◽  
Rhizocarpon Geographicum

Accurate lifespan estimates cannot be obtained from 14C profiles in the crustose lichen Rhizocarpon geographicum (L.) DC.

2001 ◽  
Vol 33 (6) ◽  
pp. 539-542 ◽  
Author(s):  
G. Bench ◽  
B.M. Clark ◽  
N.F. Mangelson ◽  
L. L. St. Clair ◽  
L. B. Rees ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Cycling ◽  
Accelerator Mass Spectrometry ◽  
Isotope Ratio ◽  
Growth Patterns ◽  
Molecular Replacement ◽  
Crustose Lichen ◽  
Rhizocarpon Geographicum ◽  
The Relationship ◽  
Isotope Ratio Measurements

AbstractRadial 14C/C profiles across three individuals of the crustose lichen Rhizocarpon geographicum (L.) DC. have been determined using accelerator mass spectrometry. These data were used to assess whether lifespan estimates can be determined in this species using 14C/C isotope ratio measurements. 14C/C profiles are relatively flat with Δ14C values (deviations from the modern radiocarbon standard) for the radial samples displaying a small spread ranging from 130 to 200 per mil. The data are consistent with carbon cycling based on growth patterns involving replacement and fusion of areoles within the thallus as well as or instead of cellular or molecular replacement. Consequently, lifespan estimates cannot be obtained from 14C/C measurements of this species and the Δ14C profiles provide no insights into whether the relationship between size and age is linear or curvilinear in this species.

The biology of the crustose lichen Rhizocarpon geographicum

Symbiosis ◽  
2011 ◽  
Vol 55 (2) ◽  
pp. 53-67 ◽  
Author(s):  
Richard A. Armstrong
Keyword(s):  
Crustose Lichen ◽  
Rhizocarpon Geographicum

scholarly journals tert-Butylphenolic Derivatives from Paenibacillus odorifer—A Case of Bioconversion

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1951 ◽  
Author(s):  
Thi-Bach-Le Nguyen ◽  
Olivier Delalande ◽  
Isabelle Rouaud ◽  
Solenn Ferron ◽  
Laura Chaillot ◽  
...  
Keyword(s):  
Bacterial Strain ◽  
2D Nmr ◽  
One Dimensional ◽  
Spectroscopic Analyses ◽  
Human Keratinocyte ◽  
Rhizocarpon Geographicum ◽  
Ionisation Mass Spectrometry ◽  
Keratinocyte Cell ◽  
Ic50 Values ◽  
First Time

Two compounds (1) and (2) containing tert-butylphenol groups were, for the first time, produced during the culture of Paenibacillus odorifer, a bacterial strain associated with the crustose lichen, Rhizocarpon geographicum. Their entire structures were identified by one-dimensional (1D) and two-dimensional (2D) NMR and high-resolution electrospray ionisation mass spectrometry (HRESIMS) spectroscopic analyses. Among them, Compound 1 exhibited significant cytotoxicity against B16 murine melanoma and HaCaT human keratinocyte cell lines with micromolar half maximal inhibitory concentration (IC50) values. Furthermore, after supplementation studies, a putative biosynthesis pathway was proposed for Compound 1 throughout a bioconversion by this bacterial strain of butylated hydroxyanisole (BHA), an antioxidant polymer additive.

A New Crustose Stereocaulon From the Mountains of Scotland and Wales

1996 ◽  
Vol 28 (6) ◽  
pp. 513-519 ◽  
Author(s):  
Alan M. Fryday ◽  
Brian J. Coppins
Keyword(s):  
Systematic Position ◽  
New Combination ◽  
Crustose Lichen

AbstractThe new combination Stereocaulon plicatile (Leight.) Fryday & Coppins is made for a previously enigmatic crustose lichen with submuriform ascospores; the basionym, Lecidea plicatilis Leight., was previously misapplied to a norsticticacid containing species of Rhizocarpon. The systematic position of the crustose Stereocaulon leucophaeopsis group is discussed.

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