Database : MEDLINE
Search on : B01.650.940.800.575.912.063.199 [DeCS Category]
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  1 / 7 MEDLINE  
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PMID:23926220
Author:Shi CS; Schopf JW; Kudryavtsev AB
Address:Department of Earth and Space Sciences, University of California, Geology Building, Los Angeles, California 90095-1567, USA. cshi7x@ucla.edu
Title:Characterization of the stem anatomy of the Eocene fern Dennstaedtiopsis aerenchymata (Dennstaedtiaceae) by use of confocal laser scanning microscopy.
Source:Am J Bot; 100(8):1626-40, 2013 Aug.
ISSN:1537-2197
Country of publication:United States
Language:eng
Abstract:PREMISE OF THE STUDY: Permineralization provides the most faithful known mode of three-dimensional preservation of the morphology and cellular anatomy of fossil plants. Standard optical microscopic documentation of such structures can provide only an approximation of their true three-dimensional form and is incapable of revealing fine-structural (<300 nm) details, deficiencies that can be addressed by the use of confocal laser scanning microscopy (CLSM). METHODS: To demonstrate the usefulness of CLSM in such studies, we compare confocal laser scanning micrographs and optical photomicrographs of the permineralized tissues of rhizomes and petioles of the Eocene fern Dennstaedtiopsis aerenchymata preserved in cherts of the Clarno Formation of Oregon, USA, and the Allenby Formation (Princeton chert) of British Columbia, Canada. KEY RESULTS: The laser-induced fluorescence detected by CLSM produces crisp high-resolution images of the three-dimensionally permineralized tissues of Dennstaedtiopsis aerenchymata. Tissues analyzed include the epidermis and epidermal hairs, cortex, aerenchyma, endodermis, vascular tissue, and pith-for each of which, CLSM yields results superior to those of standard optical microscopy. CLSM and previous Raman spectroscopic analyses of the same specimens provide evidence consistent with original biochemistry. CONCLUSIONS: Use of CLSM to characterize the morphology and cellular anatomy of permineralized fossil plants can provide accurate data in two and three dimensions at high spatial resolution, information that can be critically important to taxonomic, taphonomic, and developmental interpretations. Results presented here from this first detailed CLSM-based study of permineralized plant axes indicate that this nonintrusive, nondestructive technique should be widely applicable in paleobotany.
Publication type:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T


  2 / 7 MEDLINE  
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PMID:23263806
Author:Hu J; Shi X; Chen J
Address:College of Biological Resources and Environment Science, Qujing Normal University, Qujing 655011, Yunnan, China. hujiang@ustc.edu
Title:Four new antioxidant phenylpropanoid glycosides from Microlepia pilosissima.
Source:Arch Pharm Res; 35(12):2127-33, 2012 Dec.
ISSN:0253-6269
Country of publication:Korea (South)
Language:eng
Abstract:Four new phenylpropanoid glycosides, 9-O-[ß-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-3,4-dimethoxy-cinnamic acid (1), 9-O-[ß-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-4-methoxycinnamic acid (2), 9-O-α-L-rhamnopyranosyl-3,4-dimethoxy-cinnamic acid (3), and 9-O-[6-Oacetyl-ß-D-glucopyranosyl]-4-methoxy-cinnamic acid (4), together with three known compounds 9-O-α-L-rhamnopyranosyl-4-hydroxy-cinnamic acid (5), 9-O-ß-D-glucopyranosyl-4-methoxycinnamic acid (6), and 9-O-ß-D-glucopyranosyl-3,4-dimethoxy-cinnamic acid (7) were isolated from the 70% EtOH extract of the dry fronds of Microlepia pilosissima. Their chemical structures were elucidated by spectroscopic analysis. Moreover, 1 and 2 exhibited comparable scavenging activities with (±)-α-tocopherol against DPPH radicals, while compounds 3-7 displayed moderate antioxidant activities.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Antioxidants); 0 (Drugs, Chinese Herbal); 0 (Glycosides); 0 (Propanols)


  3 / 7 MEDLINE  
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PMID:23163828
Author:Hu J; Shi XD; Chen JG; Mao X; Yu L; Zhu L
Address:College of Biological Resources and Environment Science, Qujing Normal University, Qujing 655011, China. hujiang@ustc.edu
Title:Three new amides from Microlepia pilosissima.
Source:J Asian Nat Prod Res; 14(11):1027-31, 2012.
ISSN:1477-2213
Country of publication:England
Language:eng
Abstract:Phytochemical investigation of 70% EtOH extract of the dry fronds of Microlepia pilosissima has resulted in isolation of three new amides, (7E)-N-(3'-hydroxyl-4'-methoxy)-phenylethyl-4-hydroxyl-cinnamamide (1), (7E)-N-(3',4',5'-trihydroxyl)-phenylethyl-4-hydroxyl-cinnamamide (2), and (7E)-N-(3',4',5'-trihydroxyl)-phenylethyl-4-methoxy-cinnamamide (3). Their structures were characterized by spectroscopic analysis and chemical method, including 1D NMR, 2D NMR, and HR-ESI-MS.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Amides); 0 (Cinnamates); 0 (N-(3',4',5'-trihydroxyl)-phenylethyl-4-hydroxyl-cinnamamide); 0 (N-(3',4',5'-trihydroxyl)-phenylethyl-4-methoxy-cinnamamide); 0 (N-(3'-hydroxyl-4'-methoxy)-phenylethyl-4-hydroxyl-cinnamamide); Y0JET56H7N (cinnamamide)


  4 / 7 MEDLINE  
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PMID:22312276
Author:Tsumbu CN; Deby-Dupont G; Tits M; Angenot L; Frederich M; Kohnen S; Mouithys-Mickalad A; Serteyn D; Franck T
Address:Interfacultary Centre of Drug Research (CIRM), Laboratory of Pharmacognosy, Department of Pharmacy, Faculty of Medicine, Hospital Avenue 1, B36, University of Liège, Sart Tilman, 4000 Liège 1, Belgium; E-Mails: M.Tits@ulg.ac.be (M.T.); L.Angenot@ulg.ac.be (L.A.); M.Frederich@ulg.ac.be (M.F.).
Title:Polyphenol content and modulatory activities of some tropical dietary plant extracts on the oxidant activities of neutrophils and myeloperoxidase.
Source:Int J Mol Sci; 13(1):628-50, 2012.
ISSN:1422-0067
Country of publication:Switzerland
Language:eng
Abstract:Young leaves of Manihot esculenta Crantz (Euphorbiaceae), Abelmoschus esculentus (Malvaceae), Hibiscus acetosella (Malvaceae) and Pteridium aquilinum (Dennstaedtiaceae) are currently consumed as green vegetables by peoples in sub-Saharan Africa, Latin America, Asia and their migrants living in Western Europe. Sub-Saharan peoples use Manihot, Abelmoschus and Hibiscus also in the folk medicine to alleviate fever and pain, in the treatment of conjunctivitis, rheumatism, hemorrhoid, abscesses, ... The present study investigates the effects of aqueous extracts of those plants on the production of reactive oxygen species (ROS) and the release of myeloperoxidase (MPO) by equine neutrophils activated with phorbol 12-myristate 13-acetate (PMA). The ROS production was measured by lucigenin-enhanced chemiluminescence (CL), and the release of total MPO by an ELISA method. The study also investigates the effect of the extracts on the activity of MPO by studying its nitration activity on tyrosine and by using a new technique called SIEFED (Specific Immunological Extraction Followed by Enzymatic Detection) that allows studying the direct interaction of compounds with the enzyme. In all experiments, the aqueous extracts of the plants developed concentration-dependent inhibitory effects. A moderate heat treatment did not significantly modify the inhibitory capacity of the extracts in comparison to not heated ones. Total polyphenol and flavonoid contents were determined with an HPLC-UV/DAD analysis and a spectroscopic method using Folin-Ciocalteu reagent. Some polyphenols with well-known antioxidant activities (caffeic acid, chlorogenic acid, hyperoside, rosmarinic acid and rutin) were found in the extracts and may partly explain the inhibitory activities observed. The role of those dietary and medicinal plants in the treatment of ROS-dependent inflammatory diseases could have new considerations for health.
Publication type:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Name of substance:0 (Flavonoids); 0 (Plant Extracts); 0 (Polyphenols); 0 (Reactive Oxygen Species); EC 1.11.1.7 (Peroxidase); NI40JAQ945 (Tetradecanoylphorbol Acetate)


  5 / 7 MEDLINE  
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PMID:19801871
Author:Li MM; Wang K; Pan ZH; Chen XQ; Peng LY; Li Y; Cheng X; Zhao QS
Address:State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
Title:Two new sesquiterpene glucosides from Dennstaedtia scabra (Wall.) Moore.
Source:Chem Pharm Bull (Tokyo); 57(10):1123-5, 2009 Oct.
ISSN:1347-5223
Country of publication:Japan
Language:eng
Abstract:Two new sesquiterpene glucosides onitioside A (1) and dennstoside B (2), were isolated from the 95% EtOH extract of Dennstaedtia scabra (Wall.) Moore, together with seven known compounds, onitisin (3), pterosin A (4), pinocembrin (5), pinocembrin 7-rutinoside (6), kaempferol (7), nicotiflorin (8), and galangin (9). Their structures were determined by extensive spectroscopic analysis.
Publication type:JOURNAL ARTICLE
Name of substance:0 (Glucosides); 0 (Sesquiterpenes); 0 (dennstoside B); 0 (onitioside A)


  6 / 7 MEDLINE  
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PMID:15162773
Author:Granados B; Pérez-García B; Mendoza A
Address:Depto. de Biología, Area de Botánica Estructural y Sistemática Vegetal, Universidad Autónoma Metropolitana, Iztapalapa, A. P. 55-535, 09340, México, D. F.
Title:Fase sexual de los helechos Odontosoria schlechtendalii y Odontosoria scandens (Dennstaedtiaceae). [Sexual phase of the ferns Odontosoria schlechtendalii and Odontosoria scandens (Dennstaedtiaceae)].
Source:Rev Biol Trop; 51(3-4):675-81, 2003 Sep-Dec.
ISSN:0034-7744
Country of publication:Costa Rica
Language:spa
Abstract:The results of morphogenesis studies of the sexual phase of Odontosoria schlechtendalii and O. scandens are presented in this paper. In O. schlechtendalii and O. scandens the spores are triletes, non-chlorophyllous, and germinación is of the Vittaria-type, devoid of perine, the exine is smooth and sometimes coarsely ridged to reticulate. The development pattern is of the Adiantum-type. The adult gametophyte is cordate-spathulate, with probable presence of anteridiogen in O. schlechtendalii, both species are glabrous. Sex organs are of the common type of the leptosporangiate ferns. The first leaves appeared after 56-92 days of culture, with petiole and plate divide narrow, trichomes bifurcate and stomate anomocytic.
Publication type:ENGLISH ABSTRACT; JOURNAL ARTICLE


  7 / 7 MEDLINE  
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PMID:12947584
Author:Rojas-Alvarado AF; Tejero-Díez JD
Address:Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud, Coordinación de docencia y atención a alumnos, Av. Michoacán y La Purísima s.n., Col. Vicentina, 09340, México, D.F. arojas@xanum.uam.mx
Title:Una especie nueva de Dennstaedtia (Filicales: Dennstaedtiaceae) para México. [New species of Dennstaedtia (Filicales: Dennstaedtiaceae) to Mexico].
Source:Rev Biol Trop; 50(3-4):1007-12, 2002 Sep-Dec.
ISSN:0034-7744
Country of publication:Costa Rica
Language:spa
Abstract:Dennstaedtia gracilis A. Rojas et Tejero (Dennstaedtiaceae) is herein described and illustrated as a new species endemic to Mexico. Its belongs to the group of winged adaxial secondary costae species but it differs by the combination of characters as smaller fronds, deltate pinnules and lobed segment apex.
Publication type:ENGLISH ABSTRACT; JOURNAL ARTICLE



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