Direct frequency measurements of transitions at 520 THz (576 nm) in iodine and 260 THz (1.15 microm) in neon.

The o hyperfine component of the (127)I(2) 17-1 P(62) transition at 520 THz (576 nm) in iodine was measured with respect to the CH(4)-stabilized 88-THz He-Ne laser. A 26-THz CO(2) laser, a color-center laser at 130 THz, and a He-Ne laser at 260 THz were used as transfer oscillators. The measured I(2) frequency was 520 206 808.

Short-term regulation of hydroxymethylglutaryl coenzyme A reductase by reversible phosphorylation: modulation of reductase phosphatase in rat hepatocytes.

Hydroxymethylglutaryl CoA reductase catalyzes the limiting step in cholesterol synthesis in liver and other tissues. Beginning in 1973 studies with subcellular systems established that microsomal reductase is inactivated with ATP(Mg) and reductase kinase, and restored to full activity with phospho-protein phosphatase. By contrast reductase kinase is inactivated with phosphatase and reactivated with a second protein kinase (reductase kinase kinase).

Additional cw FIR laser lines from optically pumped CH(2)F(2).

Twenty-five new, cw, FIR lines from CH(2)F(2), optically pumped by a CO(2) laser, have been found, using a variablecoupling, open-structure resonator. Accurate wavelength measurements have been made on the 47 known CH(2)F(2) lines. The new lines are fairly uniformly distributed over a wide range, from 105 to 1448 microm.

Extension of absolute-frequency measurements to the visible: frequencies of ten hyperfine components of iodine.

Direct-frequency measurements have been extended into the visible region of the electromagnetic spectrum. The visible frequencies were synthesized by generating the second harmonic of the recently measured 260-THz (20)Ne, 1.15-microm laser with a LiNbO(3) crystal.

Frequency measurement of the 260-THz (1.15-microm) He-Ne laser.

Absolute infrared frequency measurement has been extended to 260 THz with the measurement of the strong 1.15-microm laser line in (20)Ne. The frequency was synthesized in nonlinear crystals of CdGeAs(2) and Ag(3)AsS(3) from stabilized CO(2) lasers and the 1.