Results 31 to 40 of about 81,175 (239)

Quantum Damped Harmonic Oscillator [PDF]

open access: yes, 2012
In this chapter we treat the quantum damped harmonic oscillator, and study mathematical structure of the model, and construct general solution with any initial condition, and give a quantum counterpart in the case of taking coherent state as an initial ...
Fujii, Kazuyuki
core   +2 more sources

A comparative study of resource allocation in Pteridium in different Brazilian ecosystems and its relationship with European studies

open access: yesBrazilian Journal of Biology
Pteridium is a cosmopolitan genus that acts as an invasive species in many parts of the world. Most research on this genus has occurred in Europe, and there is a lack of data on it from South America, in spite of causing considerable conservation ...
DM Silva Matos   +3 more
doaj   +1 more source

Casimir invariants and characteristic identities for $gl(\infty )$ [PDF]

open access: yes, 1996
A full set of (higher order) Casimir invariants for the Lie algebra $gl(\infty )$ is constructed and shown to be well defined in the category $O_{FS}$ generated by the highest weight (unitarizable) irreducible representations with only a finite number of
M. D. Gould, N. I. Stoilova, Sato M.
core   +2 more sources

The role of Pteridium arachnoideum(Kaulf) on the seed bank of the endangered Brazilian Cerrado

open access: yesBrazilian Journal of Biology
The native bracken (Pteridium arachnoideum) often occurs in mono-specific stands in the Brazilian Cerrado, and this dominance can impact on both the above-ground vegetation and soil seed bank.
R. O. Xavier   +3 more
doaj   +1 more source

Fate of ptaquiloside-A bracken fern toxin-In cattle.

open access: yesPLoS ONE, 2019
Ptaquiloside is a natural toxin present in bracken ferns (Pteridium sp.). Cattle ingesting bracken may develop bladder tumours and excrete genotoxins in meat and milk.
Paulo César Dos Reis Aranha   +5 more
doaj   +1 more source

Bracken Fern Control in Pastures

open access: yesEDIS, 2021
This publication discusses chemical control of bracken fern in pastures. Written by B. Sellers, J. Ferrell, and T. Wilson, and published by the UF/IFAS Agronomy Department, revised August 2021.
Brent A. Sellers   +2 more
doaj   +1 more source

Alterações anátomo-histopatológicas em ratos submetidos à dieta com extrato de broto de samambaia (Pteridium aquilinum var. arachnoideum) de dois municípios do estado do Paraná Macroscopic and microscopic changes in rats fed on a bracken fern diet (Pteridium aquilinum var. arachnoideum) from different regions of Parana State, Brazil

open access: yesArquivo Brasileiro de Medicina Veterinária e Zootecnia, 2005
The carcinogenicity of bracken fern harvest from two regions of Paraná State to induce hematury in rats was studied. In order to do that, 33 Wistar rats were divided in three groups.
G.D. Cruz   +3 more
doaj   +1 more source

Ultrafast and accurate 16S rRNA microbial community analysis using Kraken 2

open access: yesMicrobiome, 2020
Background For decades, 16S ribosomal RNA sequencing has been the primary means for identifying the bacterial species present in a sample with unknown composition.
Jennifer Lu, Steven L. Salzberg
doaj   +1 more source

Exogenous preculture with sucrose and abscisic acid improves post-cryopreservation survival of eastern bracken fern gametophytes

open access: yesScientific Reports, 2023
Cryopreservation is an important technique used in the conservation of various plant tissues. This study proposes a cryopreservation method for the long-term conservation of eastern bracken fern gametophytes (Pteridium aquilinum var.
Bo-Kook Jang   +4 more
doaj   +1 more source

Potential and historical Uses for bracken (Pteridium aquilinum (L.) Kuhn) in organic agriculture [PDF]

open access: yes, 2002
This report was presented at the UK Organic Research 2002 Conference. Bracken is considered a serious weed species, due to its toxic constituents and negative impacts on agriculture and conservation.
Donnelly, Eric   +2 more
core  

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