Burping

CAUTION Foaming and fizzing and spitting and all sorts of carrying on.) The weak base turns the strong acid into a salt, and the salt dissolves in the water-bicarbonate solution. Because of all the fizzing, you ll have to be very careful. Pressure can build up and blow the stopper out of the funnel. Invert the funnel. Point the stem A WA Y FROM EVERYONE up and toward the BACK OF THE HOOD—and open the stopcock to vent or burp the funnel. 

Tupperware was the idea of Earl Silas Tupper, a New Hampshire tree surgeon and plastics innovator. He began experimenting with PE during the early part of World War II. In 1947, he designed and patented the famous Tupper seal that sealed in freshness. In order to close the container it had to be burped to remove air. Tupperware was also bug proof, spill proof, did not rot or rust, and did not break when dropped. Even with all of these advantages, few were sold. Enter Brownie Wise, a divorced single mother from Detroit who desperately needed to supplement her income as a secretary, who had the idea of Tupperware Parties. ... 

Note - It is a good idea to have a supply of cyanide antidote ready in case you are affected by the fumes. These are sodium thiosulfate, a common photographic chemical, and amyl nitrite, a heart drug. Butyl nitrite is available in some "sex" shops as a room odorant, and may be substituted for the amyl nitrite. A few hours before beginning production of the actual cyanide, take a capsule containing 500 mg of sodium thiosulfate. It is comparatively non-toxic, but may cause a small bout of "egg burps". 

The last three pulses listed in table 1, namely the two E-BURPs and the are non-universal pulses designed to transfer Zeeman polarization Iz) into detectable transverse magnetization I or ly), but not to achieve the reverse operation. The conversion of or ly into Iz can be achieved by using the time-reversal of the considered pulse shape. An alternative... 

Fig. 1. Computer simulations of four selective excitation pulses. (Top) Pulse shapes. From left to right 90° rectangular pulse, 270° Gaussian truncated at 2.5%, Quaternion cascade Q, and E-BURP-1. The vertical axis shows the relative rf amplitudes, whereas the horizontal axis shows the time. (Middle) Trajectories of Cartesian operators in the rotating frame...

Fig. 5. Experimental calibration of a 15 ms E-BURP-1 around the optimum amplitude value on a DMX300. (Top) Excerpt of the one-dimensional spectrum of BPTI. (Bottom) Same region centered around 7 ppm excited by a 15 ms E-BURP-1 with amplitudes increasing from left to right by 1 dB steps. The optimum is located at the intermediate value (determined by smaller amplitude steps, typically of 0.1 dB).

Better profiles may sometimes be needed, in which case an E-BURP-1 is recommended, particularly for band-selective experiments. The calibration is relatively easy and very narrow transition regions are very useful (fig. 1). If a universal pulse is needed, the E-BURP-1 may either be replaced by a pulse, or if only a conversion of or ly into Iz is required, by a time-reversed E-BURP-1. 

The quality of the profile pertaining to the selected region can be improved by a modulation of the pulse lengths within the pulse train, which mimics the amplitude modulation of a simple soft pulse [8]. Simple modulation schemes can be devised for attenuating or even suppressing the side-lobes in the vicinity of the selected region (as shown in fig. 3). Alternatively, more elaborated modulation schemes as those of the BURP family [9] can be run in the DANTE-Z mode [10]. This mode actually offers a... 

The double-selective TOCSY-ROESY and TOCSY-NOESY techniques are particularly useful. They allow one to measure NOE and ROE correlations in spectra with high degree of overlap as often found in carbohydrates. In addition to the DANTE, DANTE-Z [66], and Gaussian pulses as described earlier for selective excitation, self-refocusing shaped pulses such as BURP (EBURP and UBURP) [67] have also been used for this purpose [64]. 

Gas Air that comes from normal breakdown of food. The gases are passed out of the body through the rectum (flatus) or the mouth (burp), [nih]... 

Burp Gum, A slang term for the sukmacb 17tS gtlTl Ref Glossary of Ord(1959), 51... 

In 814 patients randomly allocated to fish oils for 18 weeks for the reduction of re-stenosis after percutaneous transluminal coronary angioplasty, gastrointestinal adverse effects, most commonly bloating and burping, were reported in 37% of patients taking fish oils, versus 31% of those taking placebo (13). 

The beauty of liquid traps is that once in place they require no further oversight, care, or maintenance. Once you have seen the damages caused by a manometer or a McLeod gauge that has burped, you understand the value of liquid traps. However, the value of liquid traps can be overemphasized, and they should not be used as panaceas for clumsy vacuum work. They will not stop all the mercury (or other fluids) that are being battered around within a system, so do not depend on liquid traps to make up for carelessness. 

The re-stabilizing of the stomach pH can be helped by taking stomach powders Rennies , Alkaseltzer or small amounts of bicarbonate of soda , etc. These materials add a small amount of basic OH ions or bicarbonate, HC03, ions in order to react with the excess acid. Unfortunately the bicarbonate ions produce C02 gas which causes you to burp. 

FIGURE 9.6 Illustration of the E-BURP selective excitation pulse, (a) Depiction of the time excitation function. (b) Frequency domain excitation profiles for absorption (solid line) and dispersion... 

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