Mares' Non-Pregnancy .Urine.-The butanol extract of 300 gallons of mares' non-pregnancy urine (previously hydrolyzed with hydrochloric acid) was hydrolyzed with an excess of aqueous potassium hydroxide solution. The neutral fraction was extracted with ether, which on evaporation yielded 209 g. of tarry residue. This residue was dissolved in a minimum amount of ethyl alcohol and treated with a 2% digitonin ethyl alcohol solution. On decomposition of the digitonide and sublimation of the residue under high vacuum at 130-140°, 0.34 g. of cholesterol was obtained, m. p. 144-146°. There was no depression in melting point when mixed with an authentic sample of cholesterol.

Single-wall carbon nanotube (SWCNT) quantum dots have been fabricated on a GaAs∕AlGaAs two-dimensional electron gas (2DEG) substrate, and the single electron transport measurements have been carried out at 2.8 K and 22 mK with the 2DEG used as a gate. It was demonstrated that the gating by the 2DEG could be switched on and off by controlling a quantum point contact fabricated between the dot and the Ohmic contact to the 2DEG gate. The unique combination of the SWCNT dot and the 2DEG may open a door to realize flexible hybrid devices.

The 3ν1+ν3 band of methane has been investigated using a titanium sapphire laser (TSL) spectrometer. This band has recently been studied by others, and 31 transitions were assigned [Boraas et al., J. Chem. Phys. 100, 7916 (1994)]. In this work, the tone-burst modulation spectrum at liquid nitrogen (77 K) and room temperature (295 K) has been recorded to determine the rotational quantum number J″ of the lower level of each transition. Stark modulation spectra were also recorded at room temperature by applying a 40 kV/cm electric field to identify the E symmetry and other species. Among the 269 transitions observed in the 77 K tone-burst modulation spectrum, we have assigned 215 transitions with respect to J″, of which 49 are identified up to their tetrahedral components. We found a congested band structure that results from the large fraction of dark vibrational states that derive their intensity from a single bright state as a result of Coriolis interactions.

No abstract

No abstract

No abstract

No abstract

No abstract