Ion channels play a major role in the regulation of T cell function in health and disease. In a computer-based model, established to simulate T cells’ membrane potential (VM) generation, we discovered a discrepancy between the simulation and patch-clamp recordings. The predicted VM was more hyperpolarized than the measured VM, indicating that a yet unknown, depolarizing ion current might ...

We present radio observations of comet 9P/Tempel 1 associated with the Deep Impact spacecraft collision of 2005 July 4. Weak 18-cm OH emission was detected with the Parkes 64-m telescope, in data averaged over July 4 to 6, at a level of 12± 3 mJy km/s, corresponding to OH production rate 2.8 × 10 molecules/second (Despois et al. inversion model, or 1.0× 10 /s for the Schleicher & A’Hearn model)...

We report deep K-band (18-27GHz) observations with the 100-m Green Bank Telescope of HCN(1 − 0) line emission towards the two submillimeterselected galaxies (SMGs) SMMJ02399−0136 (z = 2.81) and SMMJ16359+6612 (z = 2.52). For both sources we have obtained spectra with channel-to-channel rms noise of σ ≤ 0.5mJy, resulting in velocity-integrated line fluxes better than < ∼ 0.1 Jy km s , although w...

We have imaged the central ∼ 1 kpc of the circumnuclear starburst disk in the galaxy NGC253 in the HCN(1→0), HCO(1→0), and CO(1→0) transitions at 60 pc resolution using the Owens Valley Radio ObservatoryMillimeter-Wavelength Array (OVRO). We have also obtained Atacama Pathfinder Experiment (APEX) observations of the HCN(4→3) and the HCO(4→3) lines of the starburst disk. We find that the emissio...

Plant growth promoting rhizobacteria produce chemical compounds with different benefits for the plant. Among them, HCN is recognized as a biocontrol agent, based on its ascribed toxicity against plant pathogens. Based on several past studies questioning the validity of this hypothesis, we have re-addressed the issue by designing a new set of in vitro experiments, to test if HCN-producing rhizob...

Aims. Following the first detection of hydrogen isocyanide (HNC) in Titan’s atmosphere, we have devised a new neutral chemical scheme for hydrogen cyanide (HCN) and HNC in the upper atmosphere of Titan. Methods. Our updated chemical scheme contains 137 compounds (with C, H, O and N elements) and 788 reactions (including 91 photolysis processes). To improve the chemistry of HNC and HCN, a carefu...

We present results from an observing campaign of the molecular content of the coma of comet C/1999 S4 (LINEAR) carried out jointly with the millimeter arrays of the Berkeley-Illinois-Maryland Association (BIMA) and the Owens Valley Radio Observatory (OVRO). Using the BIMA array in autocorrelation (‘‘single-dish’’) mode, we detected weak HCN J 1⁄4 1 0 emission from comet C/1999 S4 (LINEAR) at 14...

Coal is a major contributor to the global emission of nitrogen oxides (NOx). The NOx formation during coal utilization typically derives from the thermal decomposition of N-containing compounds (e.g., pyrrolic groups). NH₃ and HCN are common precursors of NOx from the decomposition of N-containing compounds. The existence of H₂O has significant influences on the pyrrole decomposition and NOx fo...

We present an imaging survey of the CO(1–0), HCN(1–0), and HCO(1–0) lines in the nearby Seyfert galaxies using the Nobeyama Millimeter Array and RAINBOW Interferometer. Some of the observed Seyfert galaxies including NGC 1068, NGC 1097, NGC 5033, and NGC 5194 exhibit strong HCN(1–0) emission on a few 100 pc scales. The observed HCN(1–0)/CO(1–0) and HCN(1–0)/HCO(1–0) line ratios in the Seyfert n...