Results 31 to 40 of about 2,727 (259)

Ancient plant remains with special reference to buckthorn, Frangula alnus Mill., pyrenes from Dascyleum, Balıkesir, NW Turkey

open access: yesActa Societatis Botanicorum Poloniae, 2016
Carbonized plant remains recovered from the ancient city Dascyleum (Daskyleion) in the province of Balıkesir in northwestern Turkey provide an outline of several phases of plant use in archaic, Hellenistic, and medieval times.
Emel Oybak Dönmez   +4 more
doaj   +1 more source

Synthesis of Regioselectively Functionalized Pyrenes via Transition-Metal-Catalyzed Electrocyclization

open access: yes, 2010
Transition-metal-catalyzed electrocyclic rearrangement of 2,6-diethynyl-1,1'-biphenyl precursors to form polysubstituted pyrenes is described. This method is useful for the preparation of pyrenes with uncommon substitution patterns, and selective ...
Joshua Howgego   +7 more
core   +1 more source

PHYSICAL AND CHEMICAL TREATMENTS FOR OVERCOMING DORMANCY IN Butia capitata (MARTIUS) BECCARI SEEDS TRATAMENTOS FÍSICOS E QUÍMICOS PARA SUPERAÇÃO DE DORMÊNCIA EM SEMENTES DE Butia capitata (MARTIUS) BECCARI

open access: yesPesquisa Agropecuária Tropical, 2011
The aim of this study was to assess the effect of pre-germination treatments for overcoming dormancy in Butia capitata seeds. The experiment was conducted in a randomized blocks design, in a 3x3 factorial scheme (mechanical treatments x immersion ...
Delacyr da Silva Brandão Júnior   +3 more
doaj   +1 more source

Intense excimer CPL of pyrenes linked to a quaternaphthyl

open access: yes, 2018
(R,R,R)-Quaternaphthyl possessing multiple pyrenes emits CPL with high ΦFL and glum values both in solution and in the solid state.
Tadashi Ema   +2 more
core   +1 more source

PHYSIOLOGICAL POTENTIAL AND CONSERVATION OF MURUCI (Byrsonima crassifolia) SEEDS

open access: yesRevista Brasileira de Fruticultura, 2017
The goal of the present study is to assess the physiological potential of Byrsonima crassifoliaseeds and analyze the procedures of the germination and tetrazolium tests, as well as the conservation of such seeds by testing different combinations of ...
CAMILA RIBEIRO DE SOUZA GRZYBOWSKI   +4 more
doaj   +1 more source

Checklist and a new species of Lippia (Verbenaceae) from the Diamantina Plateau, Minas Gerais, Brazil

open access: yesEuropean Journal of Taxonomy, 2021
The Diamantina Plateau is located in the central region of the Espinhaço Range, in the State of Minas Gerais, which is dominated by campo rupestre formations.
Pedro Henrique Cardoso   +3 more
doaj   +1 more source

1-(Hydroxymethyl)pyrene [PDF]

open access: yesActa Crystallographica Section E Structure Reports Online, 2010
The asymmetric unit of the title compound, C(17)H(12)O, contains two molecules, in which the fused aromatic ring systems are almost planar [maximum deviations = 0.0529 (9) and 0.0256 (9) Å]. In the crystal, aromatic π-π stacking inter-actions (perpendicular distance of centroids of about 3.4 Å) and strong O-H⋯O hydrogen bonds result in a helical ...
Tobias Gruber   +2 more
openaire   +4 more sources

Effects of Oxidized Pyrenes on the Biological Responses in the Human Bronchial Epithelial Cells

open access: yesApplied Sciences, 2022
Although polycyclic aromatic hydrocarbons (PAHs) are toxic, the effects of oxidized PAHs on health and biological responses remain unclear. In this study, we examined the in vitro effects of varying concentrations of pyrene, a type of PAH, and its ...
Akiko Honda   +5 more
doaj   +1 more source

Designed Lewis Acid–Base Passivation for High Performance Perovskite Solar Cells

open access: yesAdvanced Functional Materials, EarlyView.
ABSTRACT Silicon's high cost and long energy payback time remain major barriers to the global expansion of solar power. In contrast, metal–halide perovskites offer abundant, solution‐processable absorbers, and have achieved efficiencies of 25%–30%, positioning them as strong competitors to silicon.
Afna Manaf   +4 more
wiley   +1 more source

Polyimide‐Linked Hexaazatriphenylene‐Based Porous Organic Polymer with Multiple Redox‐Active Sites as a High‐Capacity Organic Cathode for Lithium‐Ion Batteries

open access: yesAdvanced Materials, EarlyView.
A high‐capacity polyimide‐linked porous organic polymer (HAT‐PTO) incorporating numerous redox‐active centers is synthesized via a hydrothermal reaction, delivering a high theoretical capacity of 484 mAh g−1. In situ hybridization with carboxyl‐functionalized multiwalled carbon nanotubes enhances conductivity and stability, achieving 397 mAh g−1 at C ...
Arindam Mal   +7 more
wiley   +1 more source

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