It did not induce excitation, inhibition or a rebound effect, whereas substitutions with small halogens strongly excited the BA-cell. The key thing here is keeping the reaction mixture below 5C. A rebound was visible for both cells: the typical rebound after I-benzene of the BA-cell (cf. (a) Recordings from an individual sensillum trichodeum of the female B. mori antenna. Odor generalists are cells that may be found in sensilla basiconica and coeloconica and that respond to different but overlapping spectra of stimulus compounds. María Gabriela de Brito Sanchez, Karl-Ernst Kaissling, Inhibitory and Excitatory Effects of Iodobenzene on the Antennal Benzoic Acid Receptor Cells of the Female Silk Moth Bombyx mori L., Chemical Senses, Volume 30, Issue 5, June 2005, Pages 435–442, Chemical substances were added to pieces of filter paper (7.2 × 14 mm), placed in small glass tubes (inner diameter 7 mm; length 5 cm) and mounted at a distance of 5 cm from the antenna. how do you convert aniline to iodobenzene, aniline Iodobenzene I seems to me it's easier to make iodobenzene starting with benzene, otherwise you would have to find a way to convert and amine to the halogen you seek..... solo. The load of BA per filter paper was 1, 3.3, 10 and 100 μg/f.p. (actually, I tried making it basic, but it was not decolorised. I-benzene was chosen as it produces both excitation and inhibition in the BA-cell (de Brito Sanchez, 1997, 2000). Responses were evaluated using commercially available software (Superscope, GW Instruments). Conversion of aniline into chlorobenzene. The reference electrode was filled with hemolymph ringer solution and the recording electrode with sensillum-lymph ringer solution [technique and solutions described by Kaissling (1995)]. As expected, both the bombykol and the bombykal cells were activated by bombykol and bombykal, respectively (stimulus loads: 0.1 μg/f.p. Odorant deactivation is necessary in flux detectors (Kaissling, 1998), where the stimulant accumulates in the perireceptor compartment during exposure. It is still unknown whether the two pathways are triggered by the same receptor molecule or separate ones. H C l, 9.5 m L of distilled water, 2 m L (0.0215 m o l) of aniline in a 100 m L round flask with ice bath, and wait until the temperature of mixture drops below ℃ 5 ℃. Its peripheral action is supported by the finding that it does not inhibit nerve impulse firing elicited by administering NaF or 1,2-dioctanoyl-sn-glycerol (DOG), agents which act in the transduction cascade downstream of the receptor molecules (Maida et al., 2000; Pophof and Van der Goes van Naters, 2002). Put solution of $\ce{KI}$ to the mixture, then color of the mixture turns to be black, and gas bubbles (may be nitrogen gas) rise from the mixture. at 0–5 degree Celsius temperature forms benzene diazonium chloride ( Diazotisation reaction ) Isolated antennae of B. mori moths were stimulated with the following chemical substances (Figure 1): If you are happy with the answer please accept it. During the post-stimulus phase (Figure 3b), the response to the combined stimulation was higher than the response to the stimulation with BA alone. when u react aniline +HNO2 it gives benzene diazonium chlroide{C6H5N2+Cl-} than it react with CuI/HI it gives C6H5I. second trace), and a brief rebound of the DMH-cell (five of the large spikes). Contact. To this end we extracellularly recorded receptor potentials and spike responses of the BA receptor cell under different regimes of chemical stimulation. For instance, in contrast to DTFP, (±)-linalool inhibits responses to NaF and DOG, suggesting direct effects on ion channels (Pophof and Van der Goes van Naters, 2002). specific heat, c = 0.39 J/g.°C Sodium nitrite and hydrochloric acid is added to Aniline at very low temperatures ( 0–4ºC) to form a benzene diazonium ion (a diazonium salt). Median response time is 34 minutes and may be longer for new subjects. of BA, the rebound was no longer visible. (question 2), and can I ask you about question 1, too? Inhibitory effects of general odorants were observed also in odor specialists, i.e. Iodobenzene produced the strongest effects and was therefore used in further experiments. butane) evaporates rapidly, while the excitatory key compound (e.g. Using very concentrated KI soln may be an issue as the reaction is exothermic, better to have it more dilute and cold. Inhibition with poststimulus excitation was observed when general anesthetics and the key compound of an olfactory receptor cell were applied simultaneously (Stange and Kaissling, 1995). The cell was first stimulated with all substances in their weakest concentration. All three compounds might compete with each other at the same receptor site. On this scale chromatography is a better option than distillation for final purification. For full access to this pdf, sign in to an existing account, or purchase an annual subscription. Preparation. The mechanism of this inhibition, most likely an interaction between adjacent cells, still awaits clarification. Traces 3, 4: iodobenzene partially inhibits the benzoic acid response and produces a marked rebound. We discuss our observations in the light of recent findings in Drosophila showing that the mode of response to various odorants (excitation or inhibition) depends on the receptor molecules (Hallem et al., 2004). It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide, This PDF is available to Subscribers Only. What would you call a person who is willing to give up their life for others? (white circles). The duration of the stimulus was regulated by means of an electric valve. What percent of a cesium-131 sample remains after 64 days? Thus, for inhibitors that do not evaporate quickly, a deactivation process which could determine the kinetics of the inhibition seems necessary. This suggests competition of iodobenzene and BA at least in the site of inhibition. Insect olfactory receptors do not always respond in an excitatory manner to olfactory stimuli. Undiluted halogen-substituted benzene (F-, Cl-, Br- and I-benzene), at a stimulus load of 50 μl/f.p. Put 9.5 m L of conc. Is there a puzzle that is only solvable by assuming there is a unique solution? rev 2020.11.12.37996, The best answers are voted up and rise to the top, Chemistry Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Thank you for your answer. Different kinetics of excitation and inhibition of olfactory receptor cells elicited by various odorants was already described by Boeckh (1962). Aniline is an inhibitor of the BA receptor cell as it blocks the response to BA while aniline alone causes a small receptor potential sometimes eliciting a few nerve impulses of the DMH-cell (Kaissling, 1987). Trace 2: aniline inhibits the benzoic acid response, but without a rebound. L. Shi, M. Wang, C.-A. Adult moths were kept in refrigerators at 12°C until they were used for experiments. ... Q: What are the conjugate acid and conjugate base of HCO3− ? The constant v... Q: What is the heat generated/released when 60 g of copper (specific heat= 0.39 J/C) is cooled from 40 ... A: Given, mass, m = 60 g


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