scholarly journals ЭЛЕМЕНТНЫЙ СОСТАВ ЛИШАЙНИКА Rhizocarpon НА КАМНЕ КАК ИНДИКАТОР ПЕРЕНОСА ЗАГРЯЗНЯЮЩИХ ВЕЩЕСТВ НА ТЕРРИТОРИЮ АЛТАЯ

2020 ◽  
Vol 331 (3) ◽  
pp. 72-79
Author(s):  
Юрий Владимирович Робертус ◽  
Леонид Петрович Рихванов ◽  
Дмитрий Валерьевич Юсупов ◽  
Роман Владимирович Любимов ◽  
Анна Васильевна Кивацкая ◽  
...  
Keyword(s):  
Rhizocarpon Geographicum

Актуальность работы обусловлена необходимостью изучения экологических последствий многолетнего трансграничного переноса загрязняющих веществ из индустриальных центров Восточного Казахстана на территорию Алтайского края и Республики Алтай. Цель: определить элементный состав и особенности распределения химических элементов в эпилитном лишайнике Rhizocarpon geographicum (L.) DC. на камне как биогеохимическом индикаторе специфики и интенсивности трансграничного переноса загрязняющих веществ на территорию Алтая. Методы: отбор образцов лишайника Rhizocarpon geographicum (L.) DC. на скальных обнажениях нижнепалеозойских терригенных пород для определения содержания в них ртути методом атомной абсорбции и 28 химических элементов методом инструментального нейтронно-активационного анализа, обработка полученных данных методами прикладной статистики. Результаты. Впервые получены данные об уровнях содержания и особенностях распределения комплекса химических элементов в лишайнике Rhizocarpon geographicum (L.) DC. на камне на территории Алтая. Проведено сравнение данных с региональным фоном и кларком в биосфере. Установлено наличие двух групп элементов в лишайнике – микроэлементов неорганической пыли и ассоциации химических элементов полиметаллических руд (Zn, As, Sb, Br, Hg, Au). Приведена аргументация в пользу преобладающего поступления элементов второй ассоциации в лишайник Rhizocarpon из атмосферных выпадений, переносимых с территории Восточного Казахстана. Выявлена обширная площадь повышенных концентраций изученных элементов в лишайнике Rhizocarpon, пространственно совпадающая с ранее установленной областью загрязнения снежного и растительного покрова на территории региона. Сделан вывод о пригодности элементного состава эпилитного лишайника Rhizocarpon на камне в качестве биогеохимического индикатора специфики и интенсивности трансграничного переноса загрязняющих веществ на территорию Алтая.

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.

Colonization by Lichens and the Development of Lichen-Dominated Communities in the Maritime Antarctic

1995 ◽  
Vol 27 (6) ◽  
pp. 473-483 ◽  
Author(s):  
R.I. Lewis Smith
Keyword(s):  
Growth Rates ◽  
High Growth ◽  
Percentage Increase ◽  
Maritime Antarctic ◽  
Small Individual ◽  
Nitrogenous Compounds ◽  
Orkney Islands ◽  
Signy Island ◽  
Rhizocarpon Geographicum

AbstractThree long-term studies of lichen growth and colonization have been undertaken at Signy Island, South Orkney Islands, in the maritime Antarctic. Small individual thalli of several crustose species and uncolonized plots on 12 fresh rock surfaces were photographically monitored at intervals of 3–4 years over a period of up to 20 years. The development of Ochrolechia frigida colonies on a regenerating moss bank, recently uncovered by a receding glacier, was similarly monitored. The results indicate that many lichens growing in sites enriched by nitrogenous compounds derived from populations of sea birds, have relatively rapid colonization and growth rates. Mean percentage increase in thallus area can be as high as 15–32% per annum in some nitrophilous saxicolous species (e.g. Acarospora macrocyclos, Xanthoria elegans and species of Buellia and Caloplaca), but as low as, 0·4–4% in nitrophobous species (Lecanora physciella, Lecidea sp., Rhizocarpon geographicum). Umbilicaria antarctica and Usnea Antarctica also yielded data indicating high growth rates, with colonist plants reaching several centimetres after 20 years. Colonization by mixed assemblages of lichens of new rock surfaces can attain 40->90% cover after 20 years in nutrient-enriched sites, and even 20–25% in non-biotically influenced sites. Colonization by or increase in extant O. frigida on the regenerating moribund moss bank was also quite rapid. It is suggested that the exceptionally large thalli of several lichen species and the locally extensive dense lichen fellfield communities in the maritime Antarctic may be much younger than previously supposed.

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.

scholarly journals Further Investigations on Rhizocarpon of North-Eastern Iran: R. geographicum

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Mahroo Haji Moniri
Keyword(s):  
Secondary Chemistry ◽  
Eastern Iran ◽  
Rhizocarpon Geographicum ◽  
North Eastern

Morphology, anatomy, secondary chemistry, ecology, and distribution of Rhizocarpon geographicum (Rhizocarpaceae, lichenized Ascomycota) in north-eastern Iran are investigated and discussed.

scholarly journals Recent Glacial History of an Alpine Area in the Colorado Front Range, U.S.A.: I. Establishing a Lichen-Growth Curve

1967 ◽  
Vol 6 (48) ◽  
pp. 817-832 ◽  
Author(s):  
James B. Benedict
Keyword(s):  
Growth Curve ◽  
Average Rate ◽  
Colorado Front Range ◽  
Ground Moraine ◽  
Front Range ◽  
Exposure Age ◽  
Rhizocarpon Geographicum ◽  
Valley Glacier ◽  
History Of ◽  
Lichen Growth

A lichen-growth curve has been developed for dating Recent glacial and periglacial deposits in the Indian Peaks area of the Colorado Front Range.Rhizocarpon geographicumwas selected for the study because of its long life span and consistent size-age relationship. The species grows at different rates in different micro-environments, with moisture, stability of substrate and length of snow-free growing season having the greatest effect. Growth rates were determined indirectly, by measuring the maximum diameters of circular or nearly circular thalli growing on surfaces of known exposure age. Measurements were made on 24 historically dated surfaces, ranging in age from 25 to 69 yr., and on three radiocarbon-dated surfaces, including (1) mudflow levees younger than 180 yr., (2) a rock wall built by prehistoric Indians about 970 yr. ago, and (3) ground moraine deposited by a retreating valley glacier about 2,460 radiocarbon years ago.R. geographicurrzgrows very rapidly (14. mm./100 yr.) during the First 100 yr. of its life. Growth then slows to an average rate of 3.3 mm./100 yr. The completed growth curve is believed to be suitable for dating deposits at least as old as 3,000 yr.

scholarly journals Lichen Growth on an Active Medial Moraine, Jotunheimen, Norway

1973 ◽  
Vol 12 (65) ◽  
pp. 305-313 ◽  
Author(s):  
J. A. Matthews
Keyword(s):  
Population Dynamics ◽  
Rhizocarpon Geographicum ◽  
Southern Norway ◽  
Lichen Growth

AbstractAbundant specimens of lichens, includingRhizocarpon geographicum, are reported from an active medial moraine on Storbreen, southern Norway. The size and distribution of two crustose and two foliose species are described. Inferences are made regarding the age, origin and population dynamics of the lichens. Some implications of the observations for lichenometric dating and use of lichens as indicators of moraine stability are discussed.

Sign in / Sign up

Export Citation Format

Share Document