Bibliographies thématiques / Tube lichens

Littérature scientifique sur le sujet « Tube lichens »

Auteur : Grafiati
Publié le 27 juillet 2024
Mis à jour le 29 juillet 2024

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Articles de revues sur le sujet "Tube lichens"

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Batty, K., J. W. Bates et J. NB Bell. « A transplant experiment on the factors preventing lichen colonization of oak bark in southeast England under declining SO2 pollution ». Canadian Journal of Botany 81, no 5 (1 mai 2003) : 439–51. http://dx.doi.org/10.1139/b03-039.

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To investigate the factors responsible for limited lichen recolonization on oak with declining SO2 concentrations, Parmelia caperata (L.) Ach. and Parmelia saxatilis (L.) Ach. were transplanted to five stations along a transect running from central London (U.K.) into the surrounding countryside. Healthy thalli were transplanted onto young and mature Quercus robur L. (pedunculate oak) and Betula pendula Roth (silver birch), and some were moved with their original bark attached to investigate the importance of bark acidification. Relative growth rates and visible injury were monitored over 2 years, along with concentrations of atmospheric SO2 and NO2, measured using diffusion tube samplers and bark chemistry. SO2 concentrations were low in central London in comparison with the situation in previous decades, but they remain sufficiently high to harm the most sensitive lichens. NO2 concentrations increased sharply on approaching London, and levels were higher in winter than in summer. Bark pH was lower in mature oak than in birch or young oak at the two innermost stations, and levels of bark Mg also declined in London. Transplants of P. caperata survived on birch and young oak at all transect stations except Hyde Park, whereas P. saxatilis failed to grow over a wider range of the transect stations. We conclude that modest SO2 levels, interacting with low bark pH, still inhibit recolonization of oaks by P. caperata in central London. Parmelia saxatilis, in addition, appears to be limited by another factor such as the high NO2 concentrations that now characterize urban and suburban London, rather than through an inherently poor dispersal potential.Key words: atmospheric pollution, bark acidification, epiphytic lichens, NO2, recolonization, SO2.
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FRYDAY, Alan M., Arve ELVEBAKK, Frances L. ANDERSON et Jean Y. GAGNON. « Psoroma nivale (Pannariaceae, lichenized Ascomycota) a new species with dark, elongate squamules and bacilliform ascospores from arctic Québec, Canada ». Lichenologist 51, no 5 (septembre 2019) : 419–29. http://dx.doi.org/10.1017/s0024282919000288.

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AbstractThe new species Psoroma nivale is described from an area of late snow-lie in the Keglo Bay area on the eastern side of Ungava Bay, northern Québec, Canada. It is superficially similar to P. hypnorum but has a dark, brownish black thallus colour without reddish hues, much-branched, proliferating squamules, thick paraphyses, distinct but inconspicuous IKI+ ascus tube structures, and characteristic elongate, bacilliform, often asymmetrical ascospores. The new species is compared with possible related taxa and its systematic position discussed. A key to the species of pannarioid lichens reported from arctic areas of North America is also provided.
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Peluffo, J. R., A. M. Rocha et M. C. Moly de Peluffo. « Species diversity and morphometrics of tardigrades from a medium-size city in the Neotropical Region : Santa Rosa (La Pampa, Argentina) ». Animal Biodiversity and Conservation 30, no 1 (1 juin 2007) : 43–51. http://dx.doi.org/10.32800/abc.2007.30.0043.

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Tardigrade diversity was studied in a medium-sized city in the Neotropical Region: Santa Rosa (La Pampa, Argentina). Samples were collected between February 1999 and January 2000 from lichens and mosses growing on sidewalk trees of the urban and periurban area. Five species of tardigrades were found, i.e., Echiniscus rufoviridis du Bois-Reymond Marcus, 1944, Macrobiotus areolatus Murray, 1907, Ramazzottius oberhaeuseri (Doyère, 1840), Milnesium cf. tardigradum and a non-described species of Macrobiotus. Only one species, M. cf. tardigradum, was found in areas with high levels of vehicle traffic. Results are compared with those from cities in the Nearctic and Palearctic regions. Measurements and pt index values (percentage ratios between the length of the structure considered and the buccal tube length) are provided for M. areolatus, R. oberhaeuseri and M. cf. tardigradum. Amongst the characters considered, the pt index for the stylet support insertion shows the least intraspecific variation. This character is also independent from body length and buccal-tube length.
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Currah, R. S., E. A. Smreciu, T. Lehesvirta, M. Niemi et K. W. Larsen. « Fungi in the winter diets of northern flying squirrels and red squirrels in the boreal mixedwood forest of northeastern Alberta ». Canadian Journal of Botany 78, no 12 (1 décembre 2000) : 1514–20. http://dx.doi.org/10.1139/b00-123.

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Gut contents of 138 northern flying squirrels (Glaucomys sabrinus) and 75 red squirrels (Tamiasciurus hudsonicus), which had been trapped from November to February in the boreal forest of northeastern Alberta, were examined to determine which fungi were consumed as food during the winter months in this habitat. Spores of epigeous Boletales, Russulaceae, and Cortinariaceae were most frequent and numerous. Hypogeous ascomycetes (unidentified species of Elaphomyces and Tuber) and basidiomycetes (unidentified species of Gautieria, Hymenogaster, Hysterangium, and Rhizopogon) were sometimes present in substantial amounts but were not as frequent as the remains of epigeous fungi. Guts sometimes contained remains of the tough or carbonaceous sporocarps of unidentified species of the Hymenochaetales, Diatrypaceae, Xylariaceae, and Bankeraceae. The spores of some rust fungi (e.g., Phragmidium fusiforme) along with the conidia (e.g., Helicoma sp.) and ascospores of microfungi (e.g., Sordariaceae) were also detected. Lichen tissues were absent, and this contrasts with previous suggestions that lichens are a winter food of sciurids in regions with substantial snowfall. A parallel analysis of 110 faecal pellets from northern flying squirrels collected in the same area from June to August confirms that fungi are important in its summer diet.Key words: Glaucomys sabrinus, Tamiasciurus hudsonicus, fungi, mycophagy, Sciuridae.
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Koparal, Ayşe Tansu. « Anti-angiogenic and antiproliferative properties of the lichen substances (-)-usnic acid and vulpinic acid ». Zeitschrift für Naturforschung C 70, no 5-6 (1 mai 2015) : 159–64. http://dx.doi.org/10.1515/znc-2014-4178.

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Abstract The anti-proliferative activities of the lichen substances (-)-usnic acid and vulpinic acid on the viability of HepG2 hepatocarcinoma cells, NS20Y neuroblastoma cells and HUVEC endothelial cells were studied by the MTT assay. The anti-angiogenic potential of the substances was determined by the endothelial tube formation assay. Both lichen substances exhibited strong anti-angiogenic activity and were more cytotoxic to the cancer cell lines than to the normal cell line, but vulpinic acid has more potential as an anti-angiogenic substance because of its low cytotoxicity and stronger anti-angiogenic activity on the HUVEC cell line.
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Trüe, A., N. Panichev, J. Okonkwo et P. B. C. Forbes. « Determination Of The Mercury Content Of Lichens and Comparison To Atmospheric Mercury Levels In The South African Highveld Region ». Clean Air Journal 21, no 1 (3 juin 2012) : 19–25. http://dx.doi.org/10.17159/caj/2012/21/1.7075.

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The concentration of mercury vapour in ambient air is routinely determined using specialised instruments.As an economical alternative, actively pumped Hopcalite sorbent tubes can be used to trap atmosphericmercury, which is subsequently analysed by cold vapour atomic absorption spectroscopy. Plant materialsare also readily available in most regions and can be analysed to obtain information on time averagedatmospheric mercury levels.Lichen and tree bark samples were collected in the cities of Pretoria and Witbank, dried and acid digestedwith subsequent cold vapour atomic absorption spectroscopy. Average mercury concentrations rangingfrom 74 to 193 μg.kg-1 were found in lichens from three Pretoria suburbs, whilst average Hg levels of 228μg.kg-1 were determined in lichens collected in Witbank. The average mercury concentration in tree barkwas consistently lower than in lichens, with concentrations between 28 and 72 μg.kg-1 determined insamples from three Pretoria suburbs and 75 μg.kg-1 determined in samples taken in Witbank. This study isthe first in South Africa to determine mercury levels in lichens and tree bark.Average total gaseous mercury concentrations in ambient air at the three Pretoria suburban sites, asdetermined by a semi-continuous spectroscopic method using Hopcalite sampling, ranged between 1.6and 2.5 ng.m-3, while an average of 1.7 ng.m-3 was measured in Witbank over the sampling interval.
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Rai, Himanshu, Rajan Kumar Gupta, Devvret Verma, Shreesh Gupta, Debasis Mitra, Pradeep Kumar Das Mohapatra, Areej Suliman Al-Meshal, Rokayya Sami, Amal Adnan Ashour et Alaa Shafie. « Assessment of Antimicrobial Activity of Lichenic Compounds Isolated from Menegazzia terebrata (Hoffm.) A. Massal ». Journal of Biobased Materials and Bioenergy 16, no 3 (1 juin 2022) : 418–23. http://dx.doi.org/10.1166/jbmb.2022.2201.

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The antibiotic activity of lichenic compounds atranorin, physodic, and stictic acid isolated from Menegazzia terebrata were analyzed. The antibiotic bioactivity was assessed against eight bacterial inoculums i.e., 3 g positive and 5 g negative by analyzing the minimal inhibitory concentrations (MICs) using the broth tube dilution method. All lichenic compounds showed antibiotic activities. The maximum bacterial growth inhibition activity was observed by atranorin (MIC, 0.030–0.5 mg/mL) and the minimum in physodic acid (MIC, 1 mg/mL). Stictic acid (MIC, 0.25–0.5 mg/mL) exhibited moderate antibiotic activity. Among the tested bacterial inoculums, all lichenic compounds reported antibacterial activity against a streptomycin-resistant strain of Pseudomonas aeruginosa. As a result, the study referred to the antibiotic potential of lichenic compounds, which could be developed further for pharmaceutical purposes.
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JØRGENSEN, Per M. « More, new Asian species in the lichen genus Fuscopannaria ». Lichenologist 36, no 3-4 (mai 2004) : 207–12. http://dx.doi.org/10.1017/s002428290401429x.

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In newly collected material from high altitudes in China and India three new species in the genus Fuscopannaria have been discovered: F. albomaculata, F. granulifera and F. hirsuta, all with unusual characters for the genus. The first one has remarkable tube-like structures exposing the white medulla above, the thallus thus appearing to be white-dotted. The second contains green algae, and the last one is the first regularly hairy species to be discovered in the genus.
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MICHALCZYK, ŁUKASZ, ŁUKASZ KACZMAREK et SANDRA K. CLAXTON. « Minibiotus weglarskae, a new species of Tardigrada (Eutardigrada : Macrobiotidae) from Mongolia ». Zootaxa 1008, no 1 (14 juin 2005) : 47. http://dx.doi.org/10.11646/zootaxa.1008.1.6.

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A new eutardigrade, Minibiotus weglarskae sp. nov. is described from a lichen sample collected in Mongolia. This species is similar to Minibiotus bisoctus (Horning et al.) in having ten transverse bands of irregularly shaped pores around the body but differs from it by having a narrower buccal tube, much shorter macroplacoid row length and much shorter claws. The microplacoid of the new species is round and solid whilst that of M. bisoctus is lens-shaped and not solid.
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Richard, C., J. G. Martin et S. Pouleur. « Ice nucleation activity identified in some phytopathogenic Fusarium species ». Phytoprotection 77, no 2 (12 avril 2005) : 83–92. http://dx.doi.org/10.7202/706104ar.

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In order to know which species of Fusarium are ice nucleating and to determine the factors affecting their pathogenicity, ice nucleation activity (INA) was examined in Fusarium oxysporum, F. sporotrichioides, and F. tricinctum. Positive controls (lna+) used were F. acuminatum and F. avenaceum. The test for fungal INA was done with a simple and rapid tube nucleation assay. Twelve out of the 42 F. oxysporum isolates, and 8 out of 14 F. tricinctum isolates were lna+. No INA was detected in F sporotrichioides. In this test the threshold freezing temperature tended to increase with culture age, reaching a peak of -1°C in a few samples, which is as high as the warmest INA reported for bacteria, and higher than the INA detected in pure cultures of free-living fungi, lichen fungi, lichen algae and cyanobacteria. This is the first report of INA for F oxysporum.
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Livres sur le sujet "Tube lichens"

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Three new species of Hypogymnia (Ascomycota : Parmeliaceae) from the Bering Sea region, Alaska and Russia. Seattle, WA] : Pacific Northwest Fungi Project, 2008.

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Joseph, Rhawn. Proof of Life on Mars in 500 Photos : Tube Worms, Martian Mushrooms, Metazoans, Lichens, Algae, Stromatolites, Growth, Movement, Behavior. Science Publishers, 2021.

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Ren min jiao tong chu ban she. Zhongguo gong lu jiao tong li cheng tu ce = : Zhongguo gonglu jiaotong licheng tuce. Ren min jiao tong chu ban she, 1993.

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Chapitres de livres sur le sujet "Tube lichens"

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GÖZCELİOĞLU, Bülent. « TÜRKİYE’DE BİYOÇEŞİTLİLİK VE ANADOLU’DAN YANSIMALAR ». Dans BİYOÇEŞİTLİLİK VE EKOSİSTEMLER. TÜRKİYE BİLİMLER AKADEMİSİ, 2023. http://dx.doi.org/10.53478/tuba.978-625-8352-58-0.ch03.

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"Türkiye has a large number of habitats that can be used as a living space for various species due to its geographical location (it is located at the intersection of three continents; Europe, Asia, and Africa), climatic features, and unique topographic structure. This situation, which continued throughout the geological ages, paved the way for Türkiye to have a rich biodiversity and to host many living things. Today, approximately 12,000 land plants, over 500 marine plants, roughly 2,000 fungi, almost 1,200 lichens, over 80,000 terrestrial invertebrates (insects, scorpions, spiders, etc.), over 3,000 marine invertebrates (sponges, corals, molluscs, ringworms, arthropods, echinoderms, etc.), approximately 520 marine fish, roughly 270 freshwater fish, 40 amphibians, 130 reptiles, 480 bird, and 165 mammal species live in Türkiye. Every day, new species continue to be discovered and the numbers of the living groups keep increasing. On the other hand, certain species and their habitats are under threat of extinction due to various reasons, primarily because of human influence. To protect these species and their habitats, it is extremely important for them to be recognized first and then be introduced and promoted to the public."
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« altae. Rhizoma crassum abbreviatum, fuscum, tenuiter fibrillosum. Caules 5-8 (10), foliis emortuis haud involucrati, ascendentes vel recti, simplices, vegetatione abeunte superne subramosi, pilis simplicibus semiappressis longis tecti. Folia radicalia numerosa, haud congesta, spathulata vel oblongo-elliptica obtusa, 2-5 cm longa, 0.4-1.2 cm lata, longe petiolata, petiolo lamina duplo-triplo longiore, pilis longis patentibus et semiappressis utrinque tecta, caulina sessilia ovata vel anguste ovata, breviter acuminata, basi lata, cauli semiappressa, pilis rectis semiappressis et patentibus utrinque, margine praecipue, tecta. Inflorescentia e cincinnis 2-3 formata, anthesi ineunte compacta, abeunte vero plus minusue laxa, brevis, caule 4-5-plo brevior. Flores pallide vel atro-cyanei. Calyx minus, quam ad 2/3 in lacinias acute triangulares fissus , florifer 2-3 mm longus, fructifer 3-4 mm longus, pilis rectis appressis et semiappressis densis (falciformibus et hamatis basi nullis) vestitus. Coroll a coerulea, limbo 6-7 mm diam., tubo ca. 2 mm longo, lobis late orbicularibus. Stylus calice brevior. Pedicelli fructiferi 4.5-5 mm longi, patentes, pilis rectis brevibus dense vestiti. Eremi 1.7-1.8 mm longi, elliptici, atro-fusci, margine angustissime alati, ventre subcarinati, areola late elliptica, canaliculis lateralibus exarata. Typus : Orientalis Sajan, jugum Udinskij fontem fluminus Issug-Sug, regio alpis 2050 ms.m., tundra lichenosa, 15/VI1961, L. Malyschev (NSK). Affinitas. Species M. asiática (Vestergren) Schischkin et Serg. arcticae incolae valde affinis et olim cum ea saepe conjuncta sed, eremis late ellipticis (nee anguste ellipticis), margine anguste alatis (nee late, apice praecipue alatis), foliis utrinque pilosis (nee subtus glabris), calycis dentibus triangulari-lanceolatis divergentibus (nee lineari-lanceolatis conniventibus), calyce pilis tenuibus rectis tantum (nee rectis et falciformibus) tecto differt. Perennial green loose-caespitose multicaulis (10) 15-20 cm tall plant. Rhizome stout, contracted, brown, with slender cinnamonic fibrils. Stems 5-8 (10), without involucre of dead leaves, ascending or erect, simple, weakly branched i n upper part toward end of vegetation, pubescent with long semiappressed simple hairs. Radical leaves many, not aggregated, spatulate or oblong-elliptical, obtuse, 2-5 cm long, 0.4-1.2 cm broad, long-petiolate, 2-3 times surpassing, leaf blade, pubescent on both surfaces with long patent and semiappressed hairs. Cauline leaves sessile, ovate or narrow-ovate, short-cuspidate, with broad base, semiappressed to stem, pubescent on both surfaces and specially along margin with erect semiappressed and patent hairs. Inflorescence consisting of 2 or 3 whorls, compact at commencement of anthesis, mor e or less lax toward end of anthesis, short, reaching 1/5-1/4 of stem length. Corolla blue, limb 6-7 mm in diam., tube about 2 mm long, lobes broad-orbicular. Style shorter than calyx. Calyx incised for less than 2/3 into sharp deltoid lobes, 2-3 mm long in flower, 3-4 mm long in fruit, compactly pubescent with only erect and semiappressed hairs ; falcate and uncinate hairs absent at base of calyx. Fruit stems 4.5-5 mm long, declinate from stem, compactly pubescent with short erect hairs. Erema 1.7-1.8 mm long, elliptical »,. Dans Flora of Siberia, Vol. 11, 137–39. CRC Press, 2006. http://dx.doi.org/10.1201/9781482279696-24.

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Actes de conférences sur le sujet "Tube lichens"

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Saemi, Farid, Nathan Beals et Moble Benedict. « Lichten Runner-up Paper : Semi-Empirical Modeling of Group 1 UAS Electric Powertrains ». Dans Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14676.

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This paper describes the development of performance prediction models for the electric powertrains of group 1 unmanned aerial systems (G1UAS) that use sensorless brushless DC (BLDC) motor architecture consisting of a BLDC motor, electronic speed controller, and a battery. Per US Army definitions, G1UAS are platforms that weigh less than 20 lb. (9 kg). The resulting semi-empirical models for the motor, power electronics, and battery use high-level component specifications to enable pre-conceptual design space exploration and mission-based design optimization of G1UAS without a library of test data. The models also enable tradeoffs analysis between existing and/or conceptual designs without a series of flight tests. To develop, tune, and validate the models, a custom dynamometer test setup was designed and built to measure torque, speed, and electrical power data of small-scale motor drive systems. The validated models reveal that popular claims of high efficiency for electric powertrains are only valid in a narrow band of high speed/low torque operation. This is a critical finding for vehicle designers in the VTOL industry who are increasingly transitioning to electric powertrains in low speed/high torque applications which may decrease the overall system efficiency. A traditional rotor hover test stand was also developed to generate data with a traditional rotor load. The integrated motor and electronic speed controller model was able to predict the total efficiency of the hover stand tests within 5 percent of experimental values. The electrical models presented in this work can be immediately applied to design G1UAS given the torque and speed requirements of the rotors/propellers, the operating voltage of the vehicle system, and certain high-level component specifications for the motor, electronic speed controller, and battery. The models can also be used to BLDC powertrains for small terrestrial or aquatic electric vehicles.
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