Results 41 to 50 of about 80,550 (200)

Chemotaxis of Bracken Spermatozoids : The Role of Bimalate Ions [PDF]

, 1958
1. Bracken spermatozoids are chemotactically attracted by malic acid salts and in a pH gradient aggregate between pH 3.5 and 5.6. 2. This response to pH occurs only when the sperm suspension contains malate. 3. At higher pH's, the response to an H+
Brokaw, C. J.
core   +1 more source

Differences in bird and bat traits, seed-dispersal interactions and functions between tropical montane forest and bracken-dominated areas

Frontiers in Ecology and Evolution
Most tropical plant species depend on animals to disperse their seeds. Seed dispersal by animals allows plants to colonize new sites in deforested habitats helping to accelerate forest recovery.
Cesar Mayta, Cesar Mayta, Cesar Mayta, Matthias Schleuning, Cecilia L. López, Cecilia L. López, Cecilia L. López, Mariana Villegas, Mariana Villegas, Isabell Hensen, Isabell Hensen, Silvia C. Gallegos, Silvia C. Gallegos, Silvia C. Gallegos   +13 more
doaj   +1 more source

Potential uses for bracken (Pteridium aquilinum (L.) Kuhn) in organic agrculture [PDF]

, 2006
Bracken is a weed species due to its toxic nature and adverse effects on agriculture and ecology. This poster reviews research into historical uses for fronds and litter harvested as part of organically approved control methods.
Donnelly, E, Robertson, J, Robinson, D
core  

Facilitative and competitive effects of bracken fronds and litter on tree seedling recruitment

Frontiers in Ecology and Evolution
IntroductionTropical montane forests are diverse ecosystems increasingly threatened by land-use change and frequent uncontrolled fires caused by humans.
Cecilia L. López, Cecilia L. López, Cecilia L. López, Cesar Mayta, Cesar Mayta, Cesar Mayta, Andrea Soliz, Isabell Hensen, Isabell Hensen, Silvia C. Gallegos, Silvia C. Gallegos, Silvia C. Gallegos   +11 more
doaj   +1 more source

The quantum Casimir operators of $\Uq$ and their eigenvalues

, 2010
We show that the quantum Casimir operators of the quantum linear group constructed in early work of Bracken, Gould and Zhang together with one extra central element generate the entire center of $\Uq$.
Hopkins M J, Jantzen J C, Junbo Li, Lusztig G, Macdonald I G, Zhang R B   +5 more
core   +1 more source

Impact of the Redheaded Pine Sawfly (Hymenoptera: Diprionidae) on Young Red Pine Plantations [PDF]

, 2017
The ecology of the redheaded pine sawfly was studied relative to its impact on red pine plantations. An ecological model, which formed the basis for socioeconomic analysis, was constructed.
Averill, Robert D, Fowler, Richard F, Wilson, Louis F   +2 more
core   +2 more sources

HAYSTAC: A Bayesian framework for robust and rapid species identification in high-throughput sequencing data.

PLoS Computational Biology, 2022
Identification of specific species in metagenomic samples is critical for several key applications, yet many tools available require large computational power and are often prone to false positive identifications.
Evangelos A Dimopoulos, Alberto Carmagnini, Irina M Velsko, Christina Warinner, Greger Larson, Laurent A F Frantz, Evan K Irving-Pease   +6 more
doaj   +1 more source

Discussing the Importance of Ontology and Epistemology Awareness in Practitioner Research. [PDF]

, 2010
This paper uses the focus of identity and acculturation within schools as the basis for a reflection on the ways in which researchers ground their investigations.
Bracken, Seán
core   +1 more source

New aspects to the diet of the Neolithic Tyrolean Iceman “Ötzi“

Journal of Biological Research, 2021
Three surgical interventions on the Tyrolean Iceman “Ötzi” conducted in 1995, 1997 and 2000 resulted in the collection of five ingesta samples. These samples constitute a sequence from different consecutive locations of the intestinal tract: the ileum ...
Klaus Oeggl, Werner Kofler, Alexandra Schmidl   +2 more
doaj   +1 more source

Complex numbers and symmetries in quantum mechanics, and a nonlinear superposition principle for Wigner functions

, 2005
Complex numbers appear in the Hilbert space formulation of quantum mechanics, but not in the formulation in phase space. Quantum symmetries are described by complex, unitary or antiunitary operators defining ray representations in Hilbert space, whereas ...
A.J. Bracken, Bargmann, Bayen, Bayen, Berry, Bracken, Bracken, Bracken, Cassinelli, Dias, Dirac, Dubin, Fano, Feynman, Fronsdal, Groenewold, Leonhardt, Moore, Moyal, Osborn, Takabayasi, Tatarskii, Wigner, Zachos   +23 more
core   +1 more source