Letteratura scientifica selezionata sul tema "Dicranopteris linearis"

Endophytic fungi isolated from medicinal ferns serve as significant natural resources for drug precursors or bioactive metabolites. During our survey on the diversity of endophytic fungi from Dicranopteris species (a genus of medicinal ferns) in Guizhou, Apoiospora was observed as a dominant fungal group. In this study, seven Apiospora strains, representing four new species, were obtained from the healthy plant tissues of three Dicranopteris species—D. ampla, D. linearis, and D. pedata. The four new species, namely Apiospora aseptata, A. dematiacea, A. dicranopteridis, and A. globosa, were described in detail with color photographs and subjected to phylogenetic analyses using combined LSU, ITS, TEF1-α, and TUB2 sequence data. This study also documented three new hosts for Apiospora species.

Several investigations have demonstrated Dicranopteris linearis(Burm.f.) Underw. (Gleicheniaceae) plant extracts possess numerous health-promoting properties. This review is aimed to summarize and highlight the potential possess by D. linearisto be developed into future pharmacological entity especially as anticancer agent. This study used several electronic search engines to compile and integrate a number of scientific publications related with D. linearis. Scientifically, D. linearishas been reported to have antinociceptive, anti-inflammatory, antipyretic, chemopreventive and antioxidant properties which can be linked to its potential to treat various kinds of ailments including inflammatory-relateddiseases and cancer. A number of scientific evidences related with anticancer studies suggested the ability of D. linearis-based phytochemicals to act as potent anticancer lead compounds. In conclusion, D. linearishas the potential to be developed into potent anticancer agent as depicted by a number of isolated phytochemicals which can work synergistically to contribute to its anticancer properties.

ABSTRACTAs a consequence of its relatively high productivity in primary successional sites on Mauna Loa, Hawai'i, the mat-forming fern Dicranopteris linearis can influence attributes of soil detrital pools. Decomposition, nutrient release and rates of asymbiotic N fixation in Dicranopteris litter were determined over an elevational range of oligotrophic sites. ‘Hot spots’ of nitrogen fixation occurred in Dicranopteris litter, as evidenced by acetylene reduction rates as high as 22 nmol g−1 h−1. However, potential N fixation rates for the entire litter mass were 0–0.1 g m−2 y−1, less than other N inputs such as rainfall. Dicranopteris' decomposition rates were low compared to other tropical species, even under high temperature and rainfall conditions, with ≥50% of the original leaf and >77%of the stem mass remaining after 2 y of decomposition. Slow decomposition was related to high ligninrnitrogen ratios (56–129) in litter and above-ground positioning of unabscised, decomposing litter. As a result of its slow decomposition rates, Dicranopteris is an major contributor to soil detrital pools. Aggradation of the detrital pool is an important process whereby nutrients are accrued within these ecosystems. Consequently, Dicranopteris exerts an important influence on soil genesis and ecosystem development during primary succession on pahoehoe lava.

Forest and land fires become serious problems in Indonesia that could not be well managed until today. This is then the reasons why there is so many activties being conducted in order to find the best solution including fire suppression method. Until today the suppresion methods mostly using water rather than other sources, which actually is not so effective and efficient. The research is proposed to make sure that Gel Pack Extinguishing Agent (GPEA) could be used for fire suppression. Three different fuels used were Pinus merkusii, Shorea leprosula, and Dicranopteris linearis at different of 55g, 65g, 75g, dan 85g. The results of research shown that GPEA with 5 small box per litter of water was the best dosage. The fastes suppression time based on the three fuels was Dicranopteris linearis, and the lowest was Pinus merkusii.Keywords: fuels, forest and land fires, Gel, suppresion methode, dosage

Little is known about the chemical and biological profiles of Dicranopteris linearis and Psychotria adenophylla. No previous studies have investigated alpha-glucosidase inhibition using extracts from D. linearis and P. adenophylla. In this paper, bioactive-guided isolation procedures were applied to the plants D. linearis and P. adenophylla based on alpha-glucosidase inhibition. From the most active fractions, 20 compounds (DL1–DL13 and PA1–PA7) were isolated. The chemical structures were elucidated using spectroscopic data and compared with those available in the literature. These compounds were evaluated for alpha-glucosidase inhibition, while a molecular docking study was performed to elucidate the mechanisms involved. Consequently, D. linearis and P. adenophylla might serve as a good potential for developing new antidiabetic preparations.

Pour faire face au défi du changement climatique, de nouvelles technologies ont récemment émergé, permettant l’exploitation ou le stockage d’énergies renouvelables. Des éoliennes aux voitures électriques, des solutions prometteuses apparaissent pour adapter nos modes de vie. Ces technologies ajoutent cependant une pression sur d’autres ressources non renouvelables, parmi lesquelles les terres rares (TR). Ces 16 éléments, constitués des 14 lanthanides, de l’yttrium (Y) et du scandium (Sc), sont au cœur des technologies actuelles. Les technologies de la communication (écrans des smartphones, fibres optiques) et de l’armement (superalliages), aujourd’hui estimées essentielles, accroissent encore la demande pour ce groupe d’éléments, faisant partie de la liste des « matières premières critiques » proposée par l’Union Européenne.Leur extraction lors des dernières décennies a laissé derrière elle un paysage morcelé, notamment dans le Sud de la Chine. Aujourd’hui interdites, les pratiques de décapage puis excavation, suivies d’une lixiviation en tas, ont légué des centaines d’hectares de stériles miniers. Ces milieux dégradés, qui étaient autrefois des forêts tropicales, sont sujets à une érosion intense, et contiennent encore des TR à faible concentration. Dans un contexte où les services écosystémiques des milieux naturels sont plus que jamais indispensables, est apparue la volonté de refonctionnaliser ces sols délaissés. Des aides gouvernementales chinoises ont été déployées pour leur revégétalisation à grande échelle. Des programmes de recherche ont aussi été lancés pour mieux comprendre le fonctionnement de ces écosystèmes dégradés et envisager leur restauration. Dans ce cadre, une des clés de la réussite pourrait être le recours à des plantes adaptées localement, et présentant un intérêt économique, pour la production d’énergie, de fibres, ou la récupération des terres rares présentes dans les stériles. La filière « agromine » est une solution fondée sur la nature, qui combine la culture de plantes hyperaccumulatrices et de la récupération des métaux à partir de ces plantes. Cette filière pourrait être très intéressantes dans ce contexte, puisque les espèces D. linearis L. et P. americana, hyperaccumulateurs de TR sont présentes sur ces anciens sites miniers. Ces plantes concentrent les TR dans leurs partie aériennes, jusqu’à des valeurs supérieures aux minerais exploités.La récupération des TR, via des procédés hydrométallurgiques, permettrait alors de concrétiser la valeur économique de ces plantes, et contribuerait à l’approvisionnement en TR, nécessaire au déploiement des technologies modernes. L’objectif de cette thèse, qui fait suite à celle de Z . Chour (2018, Univ. Lorraine) est de développer et optimiser des procédés de récupération de TR à partir des cendres de D. linearis et de la plante P. americana, qui a des caractéristiques botaniques, et physico-chimiques différentes. Il s’agit aussi d’étudier l’impact environnemental et le coût des différents procédés identifiés. Elle a été menée en co-direction entre l’Université de Lorraine (Nancy, France) et l’Université Sun Yat-sen (Canton, Chine). Ce travail a permis de répondre à des questions scientifiques sur la séparation de TR à faible concentrations dans des matrices riches en silice et contenant aussi de l’aluminium. Il a abouti à la conception et l’optimisation d’un procédé original à partir de D. linearis, accompagné d’une comparaison de différents procédés, au plan des consommation de matière et d’énergie et de la production des déchets, et d’une évaluation économique. Il constitue ainsi une étape essentielle à la fois pour le développement scientifique de la filière agromine et pour sa mise en œuvre
To meet the challenge of climate change, new technologies have recently emerged that allow the use or storage of renewable energy. From wind turbines to electric cars, promising solutions are emerging to adapt our lifestyles. However, these technologies are adding pressure on other non-renewable resources, including rare earth elements (REEs). These 16 elements, made up of the 14 lanthanides, yttrium (Y) and scandium (Sc), are at the heart of current technologies. Communication technologies (smartphone screens, optical fibers) and weapons technologies (superalloys), which are now considered essential, are further increasing the demand for this group of elements, which are on the list of "critical raw materials" proposed by the European Union.Their extraction over the last decades has left behind a fragmented landscape, especially in Southern China. Now banned, the practices of stripping and excavation, followed by heap leaching, have resulted in hundreds of hectares of tailings. These degraded environments, which were once tropical forests, are subject to intense erosion and still contain low concentrations of REEs. In a context where the ecosystem services of natural environments are more essential than ever, the desire to refunctionalize these derelict soils has emerged. Chinese governmental aid has been deployed for their large-scale revegetation. Research programs have also been launched to better understand the functioning of these degraded ecosystems and to consider their restoration.In this context, one of the keys to success could be the use of locally adapted plants that are of economic interest for the production of energy, fibers, or the recovery of rare earths present in the tailings. The "agromining" chain of processes is a nature-based solution, which combines the cultivation of hyperaccumulator plants and the recovery of metals from these plants. This chain could be very interesting in this context, since the species D. linearis L. and P. americana, hyperaccumulators of REEs, are present on these former mining sites. These plants concentrate the REEs in their aerial parts, up to values higher than the exploited ores. The recovery of the REEs, via hydrometallurgical processes, would then make it possible to concretize the economic value of these plants, and would contribute to the supply of REEs, necessary for the deployment of modern technologies.The objective of this thesis, which follows that of Z . Chour (2018, Univ. Lorraine) is to develop and optimize REE recovery processes from the ash of D. linearis and from the plant P. americana, which has different botanical, and physicochemical characteristics. The environmental impact and cost of the different processes identified were also studied. This research was conducted in co-supervision between the University of Lorraine (Nancy, France) and Sun Yat-sen University (Canton, China).This work allowed to answer scientific questions on the separation of REEs at low concentrations in silica-rich matrices also containing aluminium. It led to the design and optimization of an original process using D. linearis, accompanied by a comparison of different processes, in terms of material and energy consumption and waste production, and an economic evaluation. It is thus an essential step both for the scientific development of the agromining process and for its implementation