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Search Results: 1 - 10 of 487403 matches for " Jasper John A. Obico "
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Molecular Phylogeny of the Philippine Endemic Genus Antherostele Bremek. (Rubiaceae) Inferred from ITS Data (nrDNA) and Its Conservation Status  [PDF]
Jasper John A. Obico, Grecebio Jonathan D. Alejandro
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.310169
Abstract: Antherostele Bremek. is an understudied genus of Rubiaceae endemic to the Philippines formerly comprising four species of shrubs or small trees distributed in Luzon and Visayas. In this first molecular study of the genus, the ITS (nrDNA) was utilized to determine the monophyly of Antherostele, reconstruct its phylogeny, and resolve its placement in Rubiaceae. Furthermore, an update on the assessment of its conservation status of the included species in the genus was done. Antherostele is monophyletic and is nested within the tribe Urophylleae of subfamily Rubioideae which confirms its segregation from Urophyllum and its placement within Urophylleae as proposed by earlier authors based on morphology. However, the relationships of Urophylleae members remain unresolved. Antherostele is united by reflexed corolla, hairs on upper side of the corolla lobes and syngenesious stamens. The montane A. luzoniensis with small leaves is found to be sister to the rest of Antherostele species. Antherostele is hypothesized to originate from montane regions and diversified by forming larger leaves following dispersal to the shaded forest understory. From the five species of Antherostele currently recognized in the study, two are endangered (A. banahaensis, A. grandistipula) and three are critically endangered including a new species (A. callophylla, A. luzoniensis, A. sp. nov.) following the criteria of IUCN.
The Schur-Horn theorem for operators with three point spectrum
John Jasper
Mathematics , 2010,
Abstract: We characterize the set of diagonals of the unitary orbit of a self-adjoint operator with three points in the spectrum. Our result gives a Schur-Horn theorem for operators with three point spectrum analogous to Kadison's result for orthogonal projections.
Tight projections of frames on infinite dimensional Hilbert spaces
John Jasper
Mathematics , 2012,
Abstract: We characterize the frames on an infinite dimensional separable Hilbert space that can be projected to a tight frame for an infinite dimensional subspace. A result of Casazza and Leon states that an arbitrary frame for a 2N- or (2N-1)-dimensional Hilbert space can be projected to a tight frame for an N-dimensional subspace. Surprisingly, we demonstrate a large class of frames for infinite dimensional Hilbert spaces which cannot be projected to a tight frame for any infinite dimensional subspace.
Diagonals of self-adjoint operators with finite spectrum
Marcin Bownik,John Jasper
Mathematics , 2013,
Abstract: Given a finite set $X\subseteq\R$ we characterize the diagonals of self-adjoint operators with spectrum $X$. Our result extends the Schur-Horn theorem from a finite dimensional setting to an infinite dimensional Hilbert space analogous to Kadison's theorem for orthogonal projections and the second author's result for operators with three point spectrum.
The Schur-Horn theorem for operators with finite spectrum
Marcin Bownik,John Jasper
Mathematics , 2013,
Abstract: We characterize the set of diagonals of the unitary orbit of a self-adjoint operator with a finite spectrum. Our result extends the Schur-Horn theorem from a finite dimensional setting to an infinite dimensional Hilbert space analogous to Kadison's theorem for orthogonal projections and the second author's result for operators with three point spectrum.
Constructive proof of the Carpenter's Theorem
Marcin Bownik,John Jasper
Mathematics , 2013,
Abstract: We give a constructive proof of Carpenter's Theorem due to Kadison. Unlike the original proof our approach also yields the real case of this theorem.
Photo-induced electron transfer in the strong coupling regime: Waveguide-plasmon polaritons
Peng Zeng,Jasper Cadusch,Debadi Chakraborty,Trevor A. Smith,Ann Roberts,John E. Sader,Timothy J. Davis,Daniel E. Gomez
Physics , 2015,
Abstract: Reversible exchange of photons between a material and an optical cavity can lead to the formation of hybrid light--matter states where material properties such as the work function\cite{Hutchison_AM2013a}, chemical reactivity\cite{Hutchison_ACIE2012a}, ultra--fast energy relaxation \cite{Salomon_ACIE2009a,Gomez_TJOPCB2012a} and electrical conductivity\cite{Orgiu_NM2015a} of matter differ significantly to those of the same material in the absence of strong interactions with the electromagnetic fields. Here we show that strong light--matter coupling between confined photons on a semiconductor waveguide and localised plasmon resonances on metal nanowires modifies the efficiency of the photo--induced charge--transfer rate of plasmonic derived (hot) electrons into accepting states in the semiconductor material. Ultra--fast spectroscopy measurements reveal a strong correlation between the amplitude of the transient signals, attributed to electrons residing in the semiconductor, and the hybridization of waveguide and plasmon excitations.
Liberal-conservative differences in inclusion-exclusion strategy choice,
John D. Jasper,Daniel Ansted
Judgment and Decision Making , 2008,
Abstract: Inclusion and exclusion strategies for allocation of scarce goods involve different processes. The conditions under which one strategy is chosen in favor of the other, however, have not been fully explicated. In the present study, decision makers chose a single strategy after reading through descriptions of 16 potential organ recipients; they then narrowed the list of transplant candidates. Most liberals chose to use exclusion under conditions of abundance and inclusion under scarcity. In contrast, conservatives preferred an inclusion strategy under abundance and exclusion (though not significantly) under scarcity. Theoretical implications as well as ongoing work in inclusion-exclusion strategy choice, political ideology, and distributive justice are discussed.
Blood, Sweat and Grants - 'Honest Jim' and the European database-right
Jasper A. Bovenberg
Genomics, Society and Policy , 2005,
Abstract: Access to detailed, up-to-date and available bioinformatics databases has been identified by the Commission of the European Union as a pillar for the harvesting of the potential of life-sciences and biotechnology. Unconditional access to research data, however, is squarely at odds with the primary interest of every scientist to be the first to make a discovery. This classical dilemma is specifically pressing in the data-driven field of biomedical research, where data-quantity has become a quality on its own, where speed matters and patients can't wait. The dilemma urges a consideration of the principle, the practice and the law regarding access for academic researchers to unpublished research data. The consideration will include the presentation of the outcome of a global and a national survey among biomedical researchers on the accessibility of 'their' research data. The principled arguments pro unconditional access and the laws and practical considerations contra unconditional access offer conflicting perspectives and the resulting situation is compounded by the uncertainty created by the European database-right as to who holds legal title to the databases. Therefore, it is explored whether the two opposing concerns - unconditional access vs. legitimate restrictions - can be accommodated by the adoption and implementation of a general policy for access to biomedical data that greases the wheels of (European) research.
Inalienably Yours? The new case for an inalienable property right in human biological material: Empowerment of sample donors or a recipe for a tragic Anti-Commons?
Jasper A. Bovenberg
SCRIPT-ed , 2004,
Abstract: Modern biomedical research into the genetic component of common diseases calls for broad access to existing and novel collections of samples of human biological material, aka Biobanks. Groups of donors of these samples, however, increasingly claim a property right in their samples. They perceive the recognition of a personal property right in their biological material as the best means to serve two goals: to secure ongoing control over their samples after donation and to underpin their claim for a share in the proceeds that the research on their samples may yield. Given the objective of ensuring ongoing control, this property right is claimed to be inalienable. Recognition of a personal property right in one s biological material is problematic, especially where the requirement of inalienability seems at odds with the claim for a share of the profits. Yet, property rights in human biological material may be justified in a certain context, e.g. to enable subsets of patients to negotiate the terms and conditions of the research into their specific disorders. Biobanks, however, contain so many samples, which can be used for so many research purposes, that the unrestricted exercise of personal property rights by the sample donors will lead to a proliferation of rights. This proliferation is likely to deter or slow down both the creation of de novo Biobanks and the use of existing sample collections. Thus, recognising inalienable property rights in human biological material may lead to suboptimal use of these resources and create a classic anticommons property scenario. It would also undermine the current trend to simplify existing informed consent requirements which aims to facilitate broad and previously unanticipated research on de novo and existing Biobanks. In addition, the tradition of altruistic participation in research and the notion that large-scale collections of human biological material are global public goods are arguments against recognising inalienable personal property rights in human biological material, at least in the context of Biobanks. To avoid uncertainty over the issue of who owns collected human biological material, the principle that the property rights in such material vest in the entity lawfully collecting and storing the material should be implemented in legislation. This way most individuals and their offspring will benefit more than when they heed the call to stand up for their property rights in their samples.
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