We report a sensitive search for the HCN(J=2→1) emission line towards SDSS J114816.64+525150.3 (hereafter: J1148+5251) at z=6.42 with the Very Large Array (VLA). HCN emission is a star formation indicator, tracing dense molecular hydrogen gas (n(H2) ≥ 10 4 cm) within star-forming molecular clouds. No emission was detected in the deep interferometer maps of J1148+5251. We derive a limit for the ...

It is suggested that the incorporation of HCN in Titan’s atmospheric haze may be an important process affecting the HCN profile and the C/N ratio in Titan’s haze. By introducing a loss to the haze term for HCN (i.e. a production term of “poly-HCN”) in the photochemical model of Lara et al. (1996), we have improved the model’s ability to simultaneously reproduce the observed HCN and C2 hydrocarb...

Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are activated by membrane hyperpolarization that creates time-dependent, inward rectifying currents, gated by the movement of the intrinsic voltage sensor S4. However, inward rectification of the HCN currents is not only observed in the time-dependent HCN currents, but also in the instantaneous HCN tail currents. Inward rectific...

[1] The U.S. Historical Climatology Network (HCN) database contains statistical adjustments that address historical changes in observation time at each observing station in the network. A paper in 2002 suggested that these adjustments cause HCN temperature trends to be ''spuriously'' warm relative to other datasets for the United States. To test this hypothesis, this paper evaluates the reliabi...

Ghose and Desai [1] introduced a new interconnection for large-scale distributed memory multiprocessors called the Hierarchical Cubic Network (HCN). The HCN is topologically superior to a comparable hypercube. They also proposed optimal routing algorithms for the HCN and obtained its diameter, which is about three-fourths the diameter of a comparable hypercube. However, their routing algorithm ...

Results of the J = 1 − 0 HCN observations toward 34 bright far-infrared sources selected from the IRAS Point Source Catalog are reported. Together with 17 sources observed in this line earlier (Pirogov et al., 1996) they form a complete sample of the sources with flux densities S(100μm) > 500 Jy and δ > 0◦ in the outer Galaxy. The HCN data are compared with the HCO+, NH3, CS and CO data taken f...

We present high spatial resolution (5.1 × 2.7) Owens Valley Radio Observatory (OVRO) millimeter array observations of HCN (J=1-0) and HCO (J=10) emission in the inner 3 pc of the Galaxy (0.04 pc ∼ 1). The HCN and HCO emission of the Circumnuclear Disk (CND) is distributed in a well-defined ring with a peak at a radius of 1.6 pc. The observed radial velocities are generally consistent with rotat...

Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels comprise a small subfamily of proteins within the superfamily of pore-loop cation channels. In mammals, the HCN channel family comprises four members (HCN1-4) that are expressed in heart and nervous system. The current produced by HCN channels has been known as I(h) (or I(f) or I(q)). I(h) has also been designated as pacemaker c...

HCN channels play a unique role in bilaterian physiology as the only hyperpolarization-gated cation channels. Their voltage-gating is regulated by cyclic nucleotides and phosphatidylinositol 4,5-bisphosphate (PIP2). Activation of HCN channels provides the depolarizing current in response to hyperpolarization that is critical for intrinsic rhythmicity in neurons and the sinoatrial node. Addition...

Hydrogen cyanide (HCN) has been identified in the gas phase of the interstellar medium as well as in the comae of several comets. Terrestrially, HCN is a key component in the synthesis of biologically important molecules such as amino acids. In this paper, we report the results of low-temperature (18 K) ice energetic processing experiments involving pure HCN and mixtures of HCN with H2O and NH3...