507 research outputs found
Application Of Genetics
Animal breeding is an old art, which long ago developed far beyond the scientific knowledge of the subject. By actual experience men built up certain rules as to what practices were or were not good procedure for a given set of conditions. Man naturally devised philosophical. explanations which more or less satisfied his intellect as he went along. But it would be a far stretch of the imagination to call these explanations scientific
Crossbreeding hogs for pork production
Some 11 or 12 million slaughter hogs are produced on Iowa farms each year. The sale of these hogs produces the largest single item (about 40 percent) of the annual farm income of the state. Any procedure that will produce these hogs more efficiently will increase the net income o f the farmer who uses it, as well as that of the state as a whole
Spin-orbit coupling and the conservation of angular momentum
In nonrelativistic quantum mechanics, the total (i.e. orbital plus spin)
angular momentum of a charged particle with spin that moves in a Coulomb plus
spin-orbit-coupling potential is conserved. In a classical nonrelativistic
treatment of this problem, in which the Lagrange equations determine the
orbital motion and the Thomas equation yields the rate of change of the spin,
the particle's total angular momentum in which the orbital angular momentum is
defined in terms of the kinetic momentum is generally not conserved. However, a
generalized total angular momentum, in which the orbital part is defined in
terms of the canonical momentum, is conserved. This illustrates the fact that
the quantum-mechanical operator of momentum corresponds to the canonical
momentum of classical mechanics.Comment: 10 pages, as published by Eur. J. Phy
Building the field of health policy and systems research: framing the questions.
In the first of a series of articles addressing the current challenges and opportunities for the development of Health Policy & Systems Research (HPSR), Kabir Sheikh and colleagues lay out the main questions vexing the field
The CRESST Dark Matter Search
The current status of CRESST (Cryogenic Rare Event Search using
Superconducting Thermometers) and new results concerning the detector
development are presented. The basic technique of CRESST is to search for
particle Dark Matter (WIMPS, Weakly Interacting Massive particles) by the
measurement of non-thermal phonons as created by WIMP-induced nuclear recoils.
Combined with the newly developed method of simultaneous measurement of
scintillation light, strong background discrimination is possible, resulting in
a substantial increase in WIMP detection sensitivity. The short and long term
perspectives of CRESST are discussed.Comment: 12 pages, 6 figure
genenames.org: the HGNC resources in 2011
The HUGO Gene Nomenclature Committee (HGNC) aims to assign a unique gene symbol and name to every human gene. The HGNC database currently contains almost 30â000 approved gene symbols, over 19â000 of which represent protein-coding genes. The public website, www.genenames.org, displays all approved nomenclature within Symbol Reports that contain data curated by HGNC editors and links to related genomic, phenotypic and proteomic information. Here we describe improvements to our resources, including a new Quick Gene Search, a new List Search, an integrated HGNC BioMart and a new Statistics and Downloads facility
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