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Data set(s): Mattick
Period: 1536 - 2015
Record number: 29157

  • a 39938: 2018.02.02. - : Lendemer. [RLL List # Asia/China / Rec.# ]
    Keywords: New: Ophioparma pruinosa Li S.Wang & Y.Y.Zhang (from China).
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  • Zheng, Y./ Xiao, C.-J./ Guo, K./ Wang, Y./ Liu, Y./ Luo, S.-H./ Li, X.-N./ Li, S.-H. 2018: Lobarioid A, unusual antibacterial depsidone possessing an eight-membered diether ring from the edible lichen Lobaria sp.. - Tetrahedron Letters 59(8): 743-746. [RLL List # 252 / Rec.# 39988]
    Keywords: chemistry
    Abstract: Lobarioid A (1), an unusual depsidone possessing an eight-membered diether ring, was isolated from the edible lichen Lobaria sp. Its structure was elucidated by extensive NMR, MS, IR and single-crystal X-ray diffraction analyses. Compound 1 exhibited antibacterial activity against three strains of gram-positive bacteria.
    – doi:10.1016/j.tetlet.2018.01.027

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  • Brady, A.L./ Goordial, J./ Sun, H.J./ Whyte, L.G./ Slater, G.F. 2018[2017]: Variability in carbon uptake and (re)cycling in Antarctic cryptoendolithic microbial ecosystems demonstrated through radiocarbon analysis of organic biomarkers. - Geobiology 16(1): 6279. [RLL List # 252 / Rec.# 40035]
    Abstract: Cryptoendolithic lichens and cyanobacteria living in porous sandstone in the high-elevation McMurdo Dry Valleys are purported to be among the slowest growing organisms on Earth with cycles of death and regrowth on the order of 103 -104 years. Here, organic biomarker and radiocarbon analysis were used to better constrain ages and carbon sources of cryptoendoliths in University Valley (UV; 1,800 m.a.s.l) and neighboring Farnell Valley (FV; 1,700 m.a.s.l). Δ14 C was measured for membrane component phospholipid fatty acids (PLFA) and glycolipid fatty acids, as well as for total organic carbon (TOC). PLFA concentrations indicated viable cells comprised a minor (<0.5%) component of TOC. TOC Δ14 C values ranged from -272 to -185 equivalent to calibrated ages of 1,100-2,550 years old. These ages may be the result of fractional preservation of biogenic carbon and/or sudden large-scale community death and extended period(s) of inactivity prior to slow recolonization and incorporation of 14 C-depleted fossil material. PLFA Δ14 C values were generally more modern than the corresponding TOC and varied widely between sites; the FV PLFA Δ14 C value (+40) was consistent with modern atmospheric CO2 , while UV values ranged from -199 to -79 (calibrated ages of 1,665-610 years). The observed variability in PLFA Δ14 C depletions is hypothesized to reflect variations in the extent of fixation of modern atmospheric CO2 and the preservation and recycling of older organic carbon by the community in various stages of sandstone recolonization. PLFA profiles and microbial community compositions as determined by molecular genetic characterizations and microscopy differed between the two valleys (e.g., predominance of biomarker 18:2 [>50%] in FV compared to UV), representing microbial communities that may reflect distinct stages of sandstone recolonization and/or environmental conditions. It is thus proposed that Dry Valley cryptoendolithic microbial communities are faster growing than previously estimated.
    – doi:10.1111/gbi.12263

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  • Toreno, G./ Isola, D./ Meloni, P./ Carcangiu, G./ Selbmann, L./ Onofri, S./ Caneva, G./ Zucconi, L. 2018[2017]: Biological colonization on stone monuments: A new low impact cleaning method. - Journal of Cultural Heritage 30: 100-109. [RLL List # 252 / Rec.# 40029]
    Keywords: Biocides/ Black fungi/ Cyanobacteria/ Dimethyl sulfoxide/ Lichens/ Solvent gels
    Abstract: In restoration and conservation practices, biocide treatments are considered one of the most practical approaches to remove biological colonization on artworks, including stone. Numerous studies have focused on the short- and long-term effects of these treatments and recently many alternative methods to reduce their potential hazards to human health and the environment have been proposed. In this study, a solvent gel containing dimethyl sulfoxide (DMSO), already used to clean paintings, was applied on colonized marble artifacts at the monumental cemetery of Bonaria (Cagliari Italy) to remove biological patinas. The protocol efficiency was evaluated by scanning electronic microscopy, rugosimetric and colorimetric measurements and growth tests. A comparative study also was performed to validate the method using biocides currently used in conservation. The results demonstrate that DMSO solvent gel is efficient at removing patinas on stone, of low impact, easy to use, inexpensive and can be considered a more practical alternative to biocide treatments.
    – doi:10.1016/j.culher.2017.09.004

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  • Xu, H.-B./ Yang, T.-H./ Xie, P./ Liu, S.-J./ Liang, Y.-N./ Zhang, Y./ Song, Z.-X./ Tang, Z.-S. 2018[2017]: Pheophytin analogues from the medicinal lichen Usnea diffracta. - Natural Product Research 32(9): 1088-1094. [RLL List # 252 / Rec.# 40031]
    Keywords: pheophytin/ Usnea diffracta/ xanthine oxidase
    Abstract: A new pheophytin, (132S, 17S, 18S)-132-hydroxy-20-chloro-ethylpheophorbide a (3), along with two known analogues (1-2) were isolated from the lichen Usnea diffracta Vainio (Parmeliaceae). Among them, compound 3 was a rare C-20-chloro type pheophytin obtained from lichens. Their structures were elucidated by extensive spectroscopic analysis, and all the compounds were obtained for the first time from U. diffracta. Compounds (1-3) were evaluated for their xanthine oxidase (XO) inhibitory activities in vitro, and the results showed that 1-3 possessed significant enzyme inhibitory actions with IC50 values of 46.9 3.8, 75.9 7.4 and 42.1 1.7 μg/mL, respectively.
    – doi:10.1080/14786419.2017.1380019

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  • a 39887: 2018.01.28. - : Lendemer. [RLL List #  / Rec.# ]
    Keywords: New: Pertusaria jogyeensis J.S.Park & J.-S.Hur (from South Korea).
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  • Nylander,W 1869: De reactionibus in Cetrarieis. - Flora (Regensburg)\Flora 52: 441-444. [Mattick Rec.# 29157]
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    Number of hits shown/total: 7/7.
    Number of records in database: 9472.
    Current date: 2019.06.20.OK