40,427 research outputs found
High temperature compositions Patent
Method for producing refractory molybdenum disilicide
Control of Arabidopsis apical-basal embryo polarity by antagonistic transcription factors.
Plants, similarly to animals, form polarized axes during embryogenesis on which cell differentiation and organ patterning programs are orchestrated. During Arabidopsis embryogenesis, establishment of the shoot and root stem cell populations occurs at opposite ends of an apical-basal axis. Recent work has identified the PLETHORA (PLT) genes as master regulators of basal/root fate, whereas the master regulators of apical/shoot fate have remained elusive. Here we show that the PLT1 and PLT2 genes are direct targets of the transcriptional co-repressor TOPLESS (TPL) and that PLT1/2 are necessary for the homeotic conversion of shoots to roots in tpl-1 mutants. Using tpl-1 as a genetic tool, we identify the CLASS III HOMEODOMAIN-LEUCINE ZIPPER (HD-ZIP III) transcription factors as master regulators of embryonic apical fate, and show they are sufficient to drive the conversion of the embryonic root pole into a second shoot pole. Furthermore, genetic and misexpression studies show an antagonistic relationship between the PLT and HD-ZIP III genes in specifying the root and shoot poles
A simplified holographic-interferometry technique for real-time flow visualization and analysis
A holographic-interferometry technique for flow visualization and analysis that produces real-time moire fringes is described from both experimental and application considerations. It has three chief advantages: real-time data for continuous observation and photography, ease of optical adjustment, and capability of using ordinary-glass test-section windows without affecting the results. A theoretical discussion is presented describing the formation of the fringes in holographic terms and then comparing this result to that which is obtained from a conventional moire approach. A discussion on obtaining density information from the fringe pattern is also included
Dual frequency receiver system for Mariner 1967 to Venus Final engineering report
Dual frequency receiver system for inclusion in Mariner 1967 spacecraft payload for use in measuring Venusian ionosphere and atmosphere by radio occultatio
Post-operative cranial pressure monitoring system
System for monitoring of fluidic pressures in cranial cavity uses a miniaturized pressure sensing transducer, combined with suitable amplification means, a meter with scale calibrated in terms of pressures between minus 100 and plus 900 millimeters of water, and a miniaturized chart recorder covering similar range of pressures
The magnetic structure of Gd_2Ti_2O_7
We attempt to solve the magnetic structure of the gadolinium analogue of
`spin-ice', using a mixture of experimental and theoretical assumptions. The
eventual predictions are essentially consistent with both the Mossbauer and
neutron measurements but are unrelated to previous proposals. We find two
possible distinct states, one of which is coplanar and the other is fully
three-dimensional. We predict that close to the initial transition the
preferred state is coplanar but that at the lowest temperature the ground-state
becomes fully three-dimensional. Unfortunately the energetics are consequently
complicated. There is a dominant nearest-neighbour Heisenberg interaction but
then a compromise solution for lifting the final degeneracy resulting from a
competition between longer-range Heisenberg interactions and direct dipolar
interactions on similar energy scales.Comment: 12 pages, 15 figure
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Inhibition of histone deacetylase as a treatment for cardiac hypertrophy
The present invention provides for methods of treating and preventing cardiac hypertrophy. Class II HDACs, which are known to participate in regulation of chromatin structure and gene expression, have been shown to have beneficial effects on cardiac hypertrophy. Surprisingly, the present invention demonstrates that HDAC inhibitors inhibit cardiac hypertrophy by inhibiting fetal cardiac gene expression and interfering with sarcomeric organization.Board of Regents, University of Texas Syste
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