Hyakutake

Taniwaki K, Hyakutake A, Aoki T, Yoshikawa M, Guiver MD, Robertson GP (2003) Anal Chim Acta 489 191... 

Hayano, H., Shinozuka, N., and Hyakutake, M. (1982). Surface active properties of marine humic acids. Yukagaku 31, 357-362. 

Suzuki, Y., Esumi, Y., Hyakutake, H., Kono, Y., Sakurai, A. Isolation of 5-(8.Z-heptadecenyl)-resorcinol from etiolated rice seedlings as an antifungal agent. Phytochemistry 1996 41 1485-1489. 

The recent ai roach of large comets such as IP/Halley, C71996 B2 Hyakutake, and C/1995 Ol Hale-Bopp to the Earth provided a good opportunity to investigate the detailed composition of cometary ices by various methods such as mass spectrometry, infrared spectroscopy, and radio emission. The composition of interstellar ices is compared with that of the cometary ices in Table 9.3. It is striking that cometary and interstellar ices have quite comparable relative molecular abundances. 

To account for these compositional features of comets, Bar-Nun et al. [23] experimentally showed a relation of the relative abundances of CO, Ar, N2, and CHj trapped in ice, versus temperatures, and inferred tliat the abundances of N2 and CO in comets were inherent from the gases trapped during ice forming in die Uranus-Neptune regions [24]. Notesco et al. [25] have performed a similar analysis for CH and C2H, successfully accounting for the proportions of these two gases observed in comet Hyakutake by Mumma et al. [22]. 

Fig. 4. Isotopic variations of hydrogen in the Solar System (adapted from Robert et al. 2000). The deuterium/ hydrogen ratio of different components is normalized to the D/H ratio of the Sun (as it was before deuterium burning), which is thought to represent H2 in the protosolar nebula. Numbers along the y-axis represent the numbers of cases. Terrestrial hydrogen is enriched in deuterium by a factor of about six relative to solar. Among Solar System objects analysed so far, carbonaceous chondrites, Antarctic micrometeorites (Engrand Maurette 1998) and chondruies from LL3 chondrites present a distribution of D/H values that centre around the terrestrial D/H ratio. Notably, comets analysed so far (Halley, Hale Bopp and Hyakutake, references given by Dauphas et al. (2000)) present D/H values about two times higher than the terrestrial value.

Hyakutake, H. Nishitani, H. Condition for determining the static yield and fracture of a polycarbonate plate specimen with notches. Eng. Fract. Mech. 1985, 22 (3), 359-368. 

Acetylene has been observed in the atmospheres of Jupiter and Titan [33, 34] and more recently has been identified in significant abundance in comet Hyakutake [35]. Following the discovery of acetylene in Hyakutake, photochemical experiments have demonstrated [36] that this molecule is a likely precursor of C2, a widely observed component of comets. Acetylene itself may therefore be a ubiquitous constituent of comets. It has been proposed [37] that polymerization of acetylene in cometary impact on planetary atmospheres may be responsible for the formation of polycyclic aromatic hydrocarbons (PAHs) which may in turn be responsible for the colors of the atmospheres of Jupiter and Titan. Shock-induced polymerization of acetylene has been observed in the gas phase [38], and static high-pressure experiments have demonstrated polymerization of orthorhombic solid acetylene above 3 to... 

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