Page 3548 of 3639 Results 35471 - 35480 of 36381
Id/Author/Year/TitleOrder by:  Year  Id  Author  Title
30058
Kathirgamanathar S., Williams D.E., Andersen R.J., Bombuwela K., De Silva D. & Karunaratne V. (2005): β-Orcinol depsidones from the lichen Usnea sp. from Sri Lanka - Natural Product Research, 19(7): 695–701

Two β-orcinol depsidone lactones, the methyl ethers of menegazziaic acid and stictic acid were isolated along with glyceryl trilinolate and usnic acid from an Usnea sp. new to Sri Lanka growing on rotting trees of Acacia decurrans. Usnic acid exhibited potent antitermite activity against a common pest of tea, Glyptotermes dilatatus, at low elevations. Keywords: Lichen, Usnea sp., Methyl ether of menegazziaic acid, Methyl ether of stictic acid, Glyceryl trilinolate, Usnic acid, Antitermite activity. EndNote Read more... 

15952
Culberson C.F. & Culberson W.L. (1978): β-Orcinol Derivatives in Lichens: Biogenetic Evidence from Oropogon Ioxensis - Experimental Mycology, 2: 245-257

Oropogon loxensis produces atranorin, protocetraric acid, salazinic acid, and three new depsides: 2'-O-methylatranorin, methyl 3-a-hydroxy-4-O-demethylbarbatate, and methyl 4-O-demethylbarbatate. The joint occurrence of these compounds and an analysis of structural patterns among the 41 known β-orcinol derivatives support a biogenetic hypothesis involving C-methylation and/or C-formylation at the polyketide stage and a metabolic grid of redox reactions of aromatic precursors leading to the para-depsides, … EndNote Read more... 

25360
Papadopoulou P., Tzakou O., Vagias C., Kefalas P. & Roussis V. (2007): β-orcinol metabolites from the lichen Hypotrachyna revoluta - Molecules, 12(5): 997-1005

Four new β-orcinol metabolites, hypotrachynic acid (1), deoxystictic acid (2), cryptostictinolide (3) and 8 ́-methylconstictic acid (4) along with the metabolites 8 ́-methylstictic acid (5), 8 ́-methylmenegazziaic acid (6), stictic acid (7), 8 ́-ethylstictic acid (8) and atranorin (9), that have been previously described, were isolated for the first time from the tissue extracts of the lichen Hypotrachyna revoluta (Flörke) Hale. The structures of the new metabolites were elucidated on the basis … EndNote Read more... 

23926
Xiang W.-J., Wang Q.-Q., Ma L. & Hu L.-H. (2013): β-orcinol-type depsides from the lichen Thamnolia vermicularis - Natural Product Research, 27(9): 804-808

A phytochemical investigation of a herb tea made from Thamnolia vermicularis led to the isolation of three new β-orcinol-type depsides (1, 2 and 3), along with seven known compounds hypothamnolic acid (4), 30 -methylevenic acid (5), baeomycesic acid (6), squamatic acid (7), methyl 30 -methyllecanorate (8), barbatinic acid (9) and atranorin (10). The structures of the new compounds were determined on the basis of spectroscopic evidence, including 1-D and 2-D NMR and ESI–MS techniques. Keywords: … EndNote Read more... 

25589
Myllys L., Lohtander K. & Tehler A. (2001): β-tubulin, ITS and group I intron sequences challenge the species pair concept in Physcia aipolia and P. caesia - Mycologia, 93(2): 335-343

ITS, group I intron and partial β-tubulin sequences were used to infer phylogenies of a putative lichen species pair: Physcia aipolia (sexual) and P. caesia (asexual). A jackknife tree obtained from the β-tubulin sequences produced a well-resolved tree, whereas the resolution in the group I intron and in the ITS tree was lower due to homoplasy. The results obtained from the combined group I intron, ITS and β-tubulin data indicate that neither P. caesia nor P. aipolia are monophyletic … EndNote Read more... 

9653
Edagawa Y., Yamaguchia C., Saito H., Takeda T., Shimizu N., Narui T., Shibata S. & Ito Y. (2005): β1-Adrenergic receptor mediation in the lichen glucan PB-2-induced enhancement of long-term potentiation in the rat dentate gyrus in vivo - Neuroscience Research, 53: 363-368

Keywords: Long-term potentiation (LTP); Dentate gyrus; Lichen; Glucan; Adrenaline b-receptor; In vivo recording EndNote Read more... 

29950
Munzi S., Branquinho C., Cruz C., Máguas C., Leith I.D., Sheppard L.J. & Sutton M.A. (2019): δ15N of lichens reflects the isotopic signature of ammonia source - Science of The Total Environment, 653: 698–704

Although it is generally accepted that δ15N in lichen reflects predominating N isotope sources in the environment, confirmation of the direct correlation between lichen δ15N and atmospheric δ15N is still missing, especially under field conditions with most confounding factors controlled. To fill this gap and investigate the response of lichens with different tolerance to atmospheric N deposition, thalli of the sensitive Evernia prunastri and the tolerant Xanthoria parietina were exposed for ten … EndNote Read more... 

16645
Hartard B., Máguas C. & Lakatos M. (2008): δ18O characteristics of lichens and their effects on evaporative processes of the subjacent soil - Isotopes in Environmental and Health Studies, 44(1): 111-128

The study presents first data on the δ18O performance of poikilohydrous lichen ground cover, and its potential impact on the isotopic composition of water fluxes arising from subjacent soil layers. As a model organism, the globally distributed lichen Cladina arbuscula was studied under laboratory conditions as well as in the field. During a desiccation experiment, δ18O of the lichen’s thallus water and of its respired CO2 became enriched by ∼7‰ and followed a similar enrichment pattern … EndNote Read more... 

14391
Sachse D., Radke J. & Gleixner G. (2006): δD values of individual n-alkanes from terrestrial plants along a climatic gradient – Implications for the sedimentary biomarker record - Organic Geochemistry , 37(4): 469-483

The compound-specific hydrogen isotope composition (δD) of sedimentary n-alkanes is increasingly used as a palaeoclimate proxy. To explore the origin of the hydrogen isotope signal of n-alkanes from higher terrestrial plant biomass in sedimentary organic matter of small lakes we have analysed the n-alkane composition and δD values of 31 plant biomass samples (Birch (Betula), Beech (Fagus), Oak (Quercus), Alder (Alnus), Hornbeam (Carpinus) and Myrtle (Myrtus) as well as non-stomata containing Sphagnum, … EndNote Read more... 

36254
Давыдов Д.А. [Davydov D.A.] (2023): Александр Александрович Еленкин — ключевая фигура российской ботаники начала XX века [Alexander Alexandrovich Elenkin as a key person in Russian botany at the beginning of XX century] - Новости систематики низших растений [Novosti sistematiki nizshikh rastenii] / Novitates systematicae plantarum non vascularium, 57(2): D17–D46

[in Russian with English abstract: ] This year marks 150th anniversary of the birth of the outstanding Russian cryptogamist, Alexander Alexandrovich Elenkin. He is renowned as the pioneer of the Russian cyanobacterial science school and one of the founding figures in Russian lichenology. A. A. Elenkin has made a titanic work on describing the flora of blue-green algae of the USSR, and created the first domestic identification book of this group. In addition to fundamental scientific research, which … URL EndNote PDF Read more... 

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