A crystal base for the genetic code

The quantum enveloping algebra U_q(sl(2) \oplus sl(2)) in the limit q \to 0 is proposed as a symmetry algebra for the genetic code. In this approach the triplets of nucleotids or codons in the DNA chain are classified in crystal bases, tensor product of U_{q \to 0}(sl(2) \oplus sl(2)) representations. Such a construction might be compared to the baryon classification from quark building blocks in elementary particles physics, one of the main differences standing in the property of a crystal base to provide a natural order in the state constituents, this order being crucial in the codon. Then an operator ensuring the correspondence codon/amino-acid can be constructed out of the above algebra. It will be called the reading operator, and be such that two codons relative to the same (resp. different) amino-acid(s) acquire the same (resp. different) eigenvalue(s).Comment: LaTeX-2e document, package amsfonts, 11 page

CC278 Farm Energy Tips - Use Energy Wisely - Tractor Ballasting

Campaign Circular 278: This is about tractor ballasting and how and when to do so

CC270 Fuel Storage

Campaign Circular 270: This circular is about fuel storage, fuel caps, filler caps, tank colors, tank locations, fuel quality, fuel loss examples, and recommendations. At the head of the title it has Farm Energy Tips...Use Energy Wisel

CC278 Farm Energy Tips - Use Energy Wisely - Tractor Ballasting

Campaign Circular 278: This is about tractor ballasting and how and when to do so

Analysis of Breath-Holding Index as an Assessment of Cerebrovascular Reactivity

Cerebrovascular reactivity (CVR) is a key factor in regulating blood flow into the brain, and a marker for vascular disease. If the brain\u27s regulatory system is not working, a patient may be in serious trouble. Testing of CVR is one method of assessing the brain\u27s regulatory capabilities. Transcranial Doppler ultrasound (TCD) is one tool to measure CVR. In this method, carbon dioxide in the blood is transiently increased (such as with the holding of breath), and the resulting blood flow in the brain is measured. In this study, we are going to measure the variability of the breathholding index. Within the four subjects, the standard deviations of the CVR measurements are 0.27, 0.20, 0.15, and 0.61 respectively, with an overall standard deviation of 0.31 across the population. The standard deviation between the average CVR measurements of each subject is 0.09. The CVR measurement is usually higher after the first breathholding for each subject, with the following two CVR measurements being lower and less variable. There is no significant increase or decrease in the mean arterial blood pressure (MAP) before or after breath-holding. In conclusion, the breath-holding maneuver is a convenient and well-tolerated screening method for CVR. However, this experiment showed a high variability in this measurement. To obtain an accurate result, three breath-holding indices need to be taken and averaged for each subject