The fact that the growth of the chick's comb is accelerated by the administration of androgenic material has been demonstrated by Ruzicka,3 by Burrows, Byerly, and Evans,' and by Frank and Klempner.' Ruzicka painted the chick's comb with a 0.5 per cent solution of androsterone in oil each day for a period of several weeks and obtained large increases in comb area. He did not, however, study thi...

We investigate experimentally and theoretically the role of group-velocity dispersion and higher-order dispersion on the bandwidth of microresonator-based parametric frequency combs. We show that the comb bandwidth and the power contained in the comb can be tailored for a particular application. Additionally, our results demonstrate that fourth-order dispersion plays a critical role in determin...

Optical frequency comb technology is investigated for the synthesis of optical pulses. The optical signals from multiple cavities are phase-locked by the injection of a common single frequency input, where the comb signals of the individual cavities are amplified and resonated by Raman gains pumped at different wavelength bands by using multiple tones of pumps centred at different wavelengths. ...

We demonstrate control of the carrier-envelope phase of ultrashort periodic waveforms that are synthesized from a Raman-generated optical frequency comb. We generated the comb by adiabatically driving a molecular vibrational coherence with a beam at a fundamental frequency plus its second harmonic. Heterodyne measurements show that full interpulse phase locking of the comb components is realize...

We investigate the tuning behavior of a novel type of single-frequency optical synthesizers by phase comparison of the output signals of two identical devices. We achieve phase-stable and cycle-slip free frequency tuning over 28.1 GHz with a maximum zero-to-peak phase deviation of 62 mrad. In contrast to previous implementations of single-frequency optical synthesizers, no comb line order switc...

Extreme UV (XUV) frequency comb generation in the wavelength range of 51 to 85 nm is reported based on high-order harmonic generation of two consecutive IR frequency comb pulses that were amplified in an optical parametric chirped pulse amplifier. The versatility of the system is demonstrated by recording direct XUV frequency comb excitation signals in He, Ne, and Ar with visibilities of up to ...

Several methods have been employed to comb/stretch single DNA molecules such as magnetic [1] and laser tweezers [2], movement of an air-water interface [3] and air jet guided fluid flow [4]. However, the scientific community still lacks a feasible technique to directly deposit and comb large DNA molecules on surfaces. A novel method to comb large DNA molecules at the micron and ultramicro scale...

New synonymies and new combinations are proposed, based mainly on the study of type materials. They are as follows: Helina sarmentosa Fang & Fan, 1993 = Helina dianica Qian & Feng, 2005, syn. n.; Helina dianxiia Xue and Li, 2002 = Helina aureolicolorata Feng & Xue, 2002, syn. n.; Myospila lenticeps (Thomson, 1869) = Helina magnimaculata Feng, 1995, syn. n.; Spilogona angulisurstyla (Xue & Xiang...

We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz). The comb parameters (mode spacing and offset frequency) are controlled via the power and the frequency of the pump laser, which constitutes one of the comb modes. Furthermore, generation of a microwave beat note ...