PÄIVI H. TORKKELI - PUBLICATIONS

Papers Submitted Book chapters Abstracts PDF

Refereed papers published or in press (click numbers for abstracts where available):

67. Frolov, R.V., Severina, I., Novikova, E., Ignatova, I.I., Liu, H., Zhukovskaya, M., Torkkeli, P.H. and French, A.S. (2022) Opsin knockdown specifically slows phototransduction in broadband and UV-sensitive photoreceptors in Periplaneta americana. Journal of Comparative Physiology A. doi:10.1007/s00359-022-01580-z
66. Johnson, J.A.G., Liu, H., Höger, U., Rogers, S.M., Sivapalan, K., French, A.S. and Torkkeli, P.H. (2021) Mechanotransduction channel Piezo is widely expressed in the spider, Cupiennius Salei, mechanosensory neurons and central nervous system. Scientific Reports 11:7994. doi: 10.1038/s41598-021-87202-1
65. Hennenfent, A., Liu, H., Torkkeli, P.H. and French, A.S. (2020) RNA interference supports a role for Nanchung-Inactive in mechanotransduction by the cockroach, Periplaneta americana, tactile spine. Invertebrate Neuroscience 20: 1-12.doi: 10.1007/s10158-019-0234-x
64. Ignatova, I.I., French, A.S., Torkkeli, P.H., Liu, H. and Frolov, R.V. (2020) Suppression of Gq and PLC gene expression in Periplaneta americana has a small effect on responses to light. Journal of Comparative Physiology A. doi: 10.1007/s00359-020-01417-7
63. Saari, P., Immonen, E.V., Kemppainen, J., Heimonen, K., Zhukovskaya, M., Novikova, E., French, A.S., Torkkeli, P.H., Liu, H. and Frolov, R. (2018) Changes in electrophysiological properties of photoreceptors in Periplaneta americana associated with the loss of screening pigment. Journal of Comparative Physiology A 204: 915-928.doi: 10.1007/s00359-018-1290-0
62. Saari, P., Immonen, E.V., French, A.S., Torkkeli, P.H., Liu, H., Heimonen, K. and Frolov, R.V. (2018) Electrical interactions between photoreceptors in the compound eye of Periplaneta americana. Journal of Experimental Biology 221: 189340. doi:10.1242/jeb.189340.
61. Frolov, R., Immonen, E.V., Saari, P., Torkkeli, P.H., Liu, H. and French, A.S. (2018) Phenotypic plasticity in Periplaneta americana photoreceptors. Journal of General Physiology 150: 1386-1396. doi: 10.1085/jgp.201611737
60. Sukumar, V., Liu, H., Meisner, S., French, A.S. and Torkkeli, P.H. (2018) Multiple biogenic amine receptor types modulate spider, Cupiennius salei, mechanosensory neurons. Frontiers in Physiology 9: 857. doi: 10.3389/fphys.2018.00857.
59. Fabian-Fine, R., Anderson, C., Roush, M., Johnson, J.A.G., Liu, H., French, A.S. and Torkkeli, P.H. (2017) The distribution of cholinergic neurons, and their co-localization with FMRFamide in central and peripheral neurons of the spider Cupiennius salei. Cell and Tissue Research 370: 71-88. doi: 10.1007/s00441-017-2652-6.
58. Saari, P., French, A.S., Torkkeli, P.H., Liu, H., Immonen, E.V. and Frolov, R. (2017) Distinct roles of light-activated channels TRP and TRPL in photoreceptors of Periplaneta americana. Journal of General Physiology 149: 455-464.
57. Immonen, E.V., French, A.S., Torkkeli, P.H. Liu, H., Vähäsöyrinki, M. and Frolov, R.V. (2017) EAG channels expressed in microvillar photoreceptors are unsuited to diurnal vision. Journal of Physiology 595: 5465-5479. doi: 10.1113/JP273612.
56. Liu, H., French, A.S. and Torkkeli, P.H. (2017) Expression of Cys-loop receptor subunits and acetylcholine binding protein in the mechanosensory neurons, glial cells and muscle of the spider Cupiennius salei. Journal of Comparative Neurology 525: 1139-1154. doi: 10.1002/cne.24122.
55. Torkkeli, P.H., Liu, H. and French, A.S. (2015) Transcriptome analysis of the central and peripheral nervous systems of the spider Cupiennius salei reveals multiple putative Cys-loop ligand gated ion channel subunits and an acetylcholine binding protein. PLoS ONE. doi: 10.1371/journal.pone.0138068.
54. French, A.S., Meisner, S., Liu, H., Weckström, M. and Torkkeli, P.H. (2015) Transcriptome analysis and RNA interference of cockroach phototransduction indicate three opsins and suggest a major role for TRPL channels. Frontiers in Physiology 6: 207. doi: 10.3389/fphys.2015.00207.
53. Fabian-Fine R., Meisner S., Torkkeli P.H. and Meinertzhagen I.A. (2015) Co-localization of gamma-aminobutyric acid and glutamate in neurons of the spider central nervous system. Cell and Tissue Research 362: 461-479.
52. French, A.S. and Torkkeli, P.H. (2015) Some recent advances in spider sensory physiology. Physiology News 99 34-37.
51. French, A.S., Li, A.W., Meisner, S. and Torkkeli, P.H. (2014) Upstream open reading frames and Kozak regions of assembled transcriptome sequences from the spider Cupiennius salei. Selection or chance? Gene 539: 203-208.
50. French, A.S., Meisner, S., Su, C-Y and Torkkeli, P.H. (2014) CO2 and fruit odor transduction in Drosophila olfactory neurons. What controls their dynamic properties? PLoS ONE 9: e86347.doi: 10.1371/journal.pone.008634.
49. Torkkeli, P.H., Meisner, S., Pfeiffer, K. and French, A.S. (2012) GABA and glutamate receptors have different effects on excitability and are differentially regulated by calcium in spider mechanosensory neurons. European Journal of Neuroscience 36: 3602-3614.
48. Schmitz, J., Höger, U., Torkkeli, P.H. and French, A.S. (2012) Calcium buffering and clearance in spider mechanosensory neurons. Journal of Comparative Physiology A 198: 477-483.
47. Pfeiffer, K., Torkkeli P.H. and French A.S. (2012) Activation of GABAA receptors modulates all stages of mechanoreception in spider mechanosensory neurons. Journal of Neurophysiology 107: 196-204.
46. Torkkeli P.H., Panek I. & Meisner S. (2011) Ca2+/calmodulin dependent protein kinase II mediates octopamine-induced increase in sensitivity in spider VS-3 mechanosensory neurons. European Journal of Neuroscience 33: 1186-1196.
45. French, A.S., Torkkeli, P.H. and Schuckel, J. (2011) Dynamic characterization of Drosophila antennal olfactory neurons indicates multiple opponent signaling pathways in odor discrimination. Journal of Neuroscience 31: 861-869.
44. Höger, U., Torkkeli, P.H. and French, A.S. (2010) Feedback modulation of transduction by calcium in a spider mechanoreceptor. European Journal of Neuroscience 32: 1473-1479.
43. Schuckel, J., Torkkeli, P.H. and French, A.S. (2009) Two interacting olfactory transduction mechanisms have linked polarities and dynamics in Drosophila melanogaster antennal basiconic sensilla neurons. Journal of Neurophysiology 102: 214-223.
42. Pfeiffer, K., Panek, I., Höger, U., French, A.S. and Torkkeli, P.H. (2009) Random stimulation of spider mechanosensory neurons reveals long-lasting excitation by GABA and muscimol. Journal of Neurophysiology 101: 54-66.
41. Höger, U., Meisner, S., Torkkeli, P.H. and French, A.S. (2008) Regional distribution of calcium elevation during sensory transduction in spider mechanoreceptor neurons. Neuroscience Research 62: 278-285.
40. Schuckel, J., Meisner, S., Torkkeli, P.H. and French, A.S. (2008) Dynamic properties of Drosophila olfactory electroantennograms. Journal of Comparative Physiology A 194: 483-489.
39. Panek, I., Höger, U., French, A.S. and Torkkeli, P.H.(2008) Contributions of voltage- and Ca2+-activated conductances to GABA induced depolarization in spider mechanosensory neurons. Journal of Neurophysiology 99: 1596-1606.
38. French, A.S. and Torkkeli, P.H. (2008) The power law of sensory adaptation: simulation by a simple model of excitability in spider mechanoreceptor neurons. Annals of Biomedical Engineering 36: 153-161.
37. Höger, U., Torkkeli, P.H. and French, A.S. (2007) Ratiometric calcium concentration estimation by LED excitation during mechanotransduction in single sensory neurons. Journal of Neuroscience Methods 164: 255-260.
36. French, A.S., Panek, I. and Torkkeli, P.H. (2006) Shunting versus inactivation: simulation of GABAergic inhibition in spider mechanoreceptors suggests that either is sufficient. Neuroscience Research 55: 189-196.
35. Widmer A., Panek I. Höger U., Meisner S., French A.S. and Torkkeli P.H. (2006) Acetylcholine receptors in spider peripheral mechanosensilla. Journal of Comparative Physiology A 192: 85-95.
34. Höger U., Torkkeli P.H. and French A.S. (2005) Calcium concentration changes during sensory transduction in spider mechanoreceptor neurons. European Journal of Neuroscience 22: 3171-3178.
33. Panek I., and Torkkeli P.H. (2005) Inhibitory glutamate receptors in spider peripheral mechanosensory neurons. European Journal of Neuroscience 22: 636-646.
32. Widmer A., Höger U., Meisner S., French A.S. and Torkkeli P.H. (2005) Spider peripheral mechanosensory neurons are directly innervated and modulated by octopaminergic efferents. Journal of Neuroscience 25: 1588-1598.
31. Clark J., Meisner S. and Torkkeli P.H. (2005) Immunocytochemical localization of choline acetyltransferase and muscarinic ACh receptors in the antenna during development of the sphinx moth Manduca sexta. Cell and Tissue Research 320: 163-173.
30. Torkkeli P.H., Widmer A. and Meisner S. (2005) Expression of muscarinic acetylcholine receptors and choline acetyltransferase enzyme in cultured antennal sensory neurons and non-neural cells of the developing moth Manduca sexta. Journal of Neurobiology 62: 316-329.
29. Gingl, E., French, A.S., Panek, I., Meisner, S. and Torkkeli, P.H. (2004) Dendritic excitability and localization of GABA mediated inhibition in spider mechanoreceptor neurons. European Journal of Neuroscience 20: 59-65.
28. French, A.S. and Torkkeli, P.H. (2004) Mechanotransduction in spider slit sensilla. Canadian Journal of Physiology and Pharmacology 82: 541-548.
27. Panek I., Meisner S. and Torkkeli P.H. (2003) Distribution and function of GABAB receptors in spider peripheral mechanosensilla. Journal of Neurophysiology 90: 2571-2580.
26. French, A.S., Höger, U., Sekizawa, S.-i. and Torkkeli, P.H. (2003) A context-free data compression approach to measuring information transmission by action potentials. BioSystems 69: 55-61.
25. French, A.S., Torkkeli, P.H. and Seyfarth, E.-A. (2002) From stress and strain to spikes: mechanotransduction in spider slit sensilla. Journal of Comparative Physiology A 188: 739-752.
24. Panek, I., French A.S., Seyfarth, E.-A., Sekizawa, S.-i. and Torkkeli, P.H. (2002) Peripheral GABAergic inhibition of spider mechanosensory afferents. European Journal of Neuroscience 16: 96-104.
23. Torkkeli, P.H. and French, A.S. (2002) Simulation of different firing patterns in paired spider mechanoreceptor neurons: The role of Na+ channel inactivation. Journal of Neurophysiology 87: 1363-1368.
22. Torkkeli P.H. and Panek I. (2002) Neuromodulation of arthropod mechanosensory neurons. Micros. Res. Tech. 58:299-311. (Invited contribution).
21. French, A.S., Höger, U., Sekizawa, S.-i. and Torkkeli, P.H. (2001) Frequency response functions and information capacities of paired spider mechanoreceptor neurons. Biological Cybernetics 85: 293-300.
20. Torkkeli, P.H., Sekizawa, S.-i. and French, A.S. (2001) Inactivation of voltage-activated Na+ currents contributes to different adaptation properties of paired mechanosensory neurons. Journal of Neurophysiology 85: 1595-1602.
19. French, A.S., Sekizawa, S.-i., Höger, U. and Torkkeli, P.H. (2001) Predicting the responses of mechanoreceptor neurons to physiological inputs by nonlinear system identification. Annals of Biomedical Engineering 29: 187-194.
18. Sekizawa, S.-i., French, A.S. and Torkkeli, P.H. (2000) Low-voltage activated calcium current does not regulate the firing behavior in paired mechanosensory neurons with different adaptation properties. Journal of Neurophysiology 83: 746-753.
17. Torkkeli, P.H., and French, A.S. (1999) Primary culture of antennal mechanoreceptor neurons of Manduca sexta. Cell and Tissue Research 297: 301-309.
16. Sekizawa, S.-i., French, A.S., Höger, U. and Torkkeli, P.H. (1999) Voltage-activated potassium outward currents in two types of spider mechanoreceptor neurons. Journal of Neurophysiology 81: 2937-2944.
15. French, A.S. and Torkkeli, P.H. (1998) Information transmission at 500 bits/s by action potentials in a mechanosensoty neuron of the cockroach. Neuroscience Letters 243: 113-116.
14. Höger, U., Torkkeli, P.H., Seyfarth, E.-A. and French, A.S. (1997) Ionic selectivity of mechanically activated channels in spider mechanoreceptor neurons. Journal of Neurophysiology 78: 2079-2085.
13. Sanders, E.J., Torkkeli, P.H. and French, A.S. (1997) Patterns of cell death during gastrulation in the chick and mouse embryos. Anatomy and Embryology 195: 147-154.
12. Torkkeli, P.H. and French, A.S. (1995) Slowly inactivating outward currents in a cuticular mechanoreceptor neuron of the cockroach (Periplaneta americana). Journal of Neurophysiology 74: 1200-1211.
11. McKay, R.R., Miller, K., Weckström, M., Torkkeli, P.H., Jörvilehto, M. and Shortridge, R.D. (1994) The rpa (receptor potential absent) visual mutant of the blowfly (Calliphora erythrocephala) is deficient in phospholipase C in the eye. J. Neurogenetics 9: 177-187.
10. Torkkeli, P.H. and French, A.S. (1994) Characterization of a transient outward current in a rapidly adapting insect mechanosensory neuron. Pflügers Archiv 429: 72-78.
9. French, A.S. and Torkkeli, P.H. (1994) The time course of sensory adaptation in the cockroach tactile spine. Neuroscience Letters 178: 147-150.
8. French, A.S. and Torkkeli, P.H. (1994) The basis of rapid adaptation in mechanoreceptors. News in Physiological Sciences 9: 158-161.
7. French, A.S., Sanders, E.J., Duszyk, E., Prasad, S., Torkkeli, P.H., Haskins, J. and Murphy, R.A. (1993) Immunocytochemical localization of sodium channels in an insect central nervous system using a site-directed antibody. Journal of Neurobiology 24: 939-948.
6. Torkkeli, P.H. and French, A.S. (1993) Mapping extracellular excitability in an insect mechanoreceptor neuron. Brain Research 632: 317-320.
5. Zhang, B.G., Torkkeli, P.H. and French, A.S. (1992) Octopamine selectively modifies the slow component of sensory adaptation in an insect mechanoreceptor. Brain Research 591: 351-355.
4. Torkkeli, P.H., Weckström, M. and Jörvilehto, M. (1991) Membrane maintenance and electrical properties of photoreceptors of wildtype and rpa-mutant (receptor potential absent) blowflies (Calliphora erythrocephala). Cell Tissue Res. 266: 97-106.
3. Stockbridge, L.L., Torkkeli, P.H. and French, A.S. (1991) Intracellular nonlinear frequency response measurements in the cockroach tactile spine neuron. Biological Cybernetics 65: 181-187.
2. Torkkeli, P.H. and Jörvilehto, M. (1989) Fotoreseptorien elinehto: Kalvoston uusiutuminen. Solubiologi 3: 11-16.
1. Torkkeli, P.H., Weckström, M., Kouvalainen, E. and Jörvilehto, M. (1989) Morphological and functional characteristics of rpa (receptor potential absent) visual mutant of the blowfly (Calliphora erythrocephala). J. Comp. Physiol. A. 165: 333-341.

Papers submitted or in preparation:

Book chapters published or in press :

7. French A.S. and Torkkeli P.H. (2012) Sensory receptors and mechanotransduction. In: Sperelakis N., (Ed.) Cell Physiology Source Book. Academic Press, San Diego, London, Boston, New York, Sydney, Tokyo, Toronto. 4th edition). 633-647.
6. French, A.S. and Torkkeli, P.H. (2009) Mechanoreception (Touch, Sensillar Structure). In: Encyclopedia of Insects. Ed: V.H. Resh and R.T. Cardé. Academic Press, San Diego. pp. 610-611.
5. French, A.S. and Torkkeli, P.H. (2009) Mechanoreceptors. In: Encyclopedia of Neuroscience. Ed: L.R. Squire. Academic Press, Oxford. 5: 689-695.
4. French, A.S. and Torkkeli, P.H. (2007) Mechanosensitive ion channels of spiders: Mechanical coupling, electrophysiology and synaptic modulation. In: Current Topics in Membranes 59: Mechanosensitive Ion Channels, Part B. Ed: O.P. Hamill. Elsevier. pp. 1-20.
3. French, A.S. and Torkkeli, P.H. (2003) Mechanotransduction (Touch, Sensillar Structure). In: Encyclopedia of Insects. Ed: V.H. Resh and R.T. Cardé. Academic Press, San Diego pp. 689-690.
2. Panek I. and Torkkeli P.H. (2002) A strategy for survival: Modulation of spider mechanosensation. In: Arthropods: Chemical, Physiological and Environmental Aspects. Ed: D. Konopinska. Wydawnictwo Uniwersytetu Wroclawskiego. pp. 223-227.
1. French, A.S. and Torkkeli, P.H. (2001) Sensory Receptors and Mechanotransduction. In: Cell Physiology Source Book, 3rd Edition. Ed: N. Sperelakis. Academic Press, San Diego. pp. 761-773.

Abstracts:

76. Torkkeli, P.H., Johnson J.A.G., Liu H., Höger U. and French A.S. (2019). Piezo protein is required for mechanotransduction in the spider, Cupiennius salei, slit sensilla. Invertebrate Sound and Vibration XVII, Iowa City, USA.
75. French, A.S., Hennenfent, A., Liu, H. and Torkkeli, P.H. (2019) Evidence for a nanchung-inactive model of mechanotransduction in the cockroach tactile spine. Invertebrate Sound and Vibration XVII, Iowa City, USA.
74. Torkkeli, P.H., Johnson, J.A., Liu H., Sivapalan, K. and French A.S. (2018) Is Piezo protein the mechanotransduction channel in spider Cupiennius salei mechanosensilla? 13th Congress of the International Society for Neuroethology. Brisbane, Australia P-163.
73. Johnson, J.A., Liu, H., Fabian-Fine, R., French, A.S. and Torkkeli, P.H. (2017) Localization of cholinergic markers in the central nervous system of the spider, Cupiennius salei. 10th Department of Physiology and Biophysics Graduate Student Research Day.
72. Torkkeli, P.H., Sukumar, V., Meisner, S., Panek, I. and French, A.S. (2015) Spider, Cupiennius salei, mechanosensory neurons have multiple biogenic amine receptor types, including constitutively active receptors. Program No. 205.11. 2015 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2015. Online.
71. French, A.S., Torkkeli, P.H., Meisner, S., Liu, H., Immonen, E.-V., Frolov, R. and Weckström, M. (2015) Molecular and functional characterization of opsins and TRP channels in compound eyes of the cockroach, Periplaneta americana. Program No. 58.21. 2015 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2015. Online.
70. Torkkeli, P.H. and French, A.S. (2014) The cys-loop ligand-gated ion channel gene family of the spider Cupiennius salei nervous system. 11th International Congress of Neuroethology.
69. French, A.S., Li, W.A., Meisner, S. and Torkkeli, P.H. (2014) The transcriptome of the spider Cupiennius salei peripheral nervous system ö identifying genes involved in mechanosensation. 11th International Congress of Neuroethology.
68. Torkkeli, P.H., Wu Li, A., Meisner, S. and French, A.S. (2013) Several octopamine receptor subtypes are involved in modulation of spider mechanosensory neurons. Invertebrate Sound and Vibration 14: 58.
67. French, A.S., Höger, U., Schmitz, J. and Torkkeli, P.H. (2013) Calcium ions modulate transduction, and are strongly buffered in spider mechanosensory neurons. Invertebrate Sound and Vibration 14: 22.
66. French, A.S., Li, A., Meisner, S. and Torkkeli, P.H. (2013) Transcriptome assembly of neurotransmitter receptors in spider mechanoreceptors. Journal of Physiological Sciences (submitted).
65. Torkkeli, P.H., Meisner, S. and French, A.S. (2012) Ionotropic GABA and glutamate receptors have different effects on excitability and are differentially regulated by calcium in spider mechanosensory neurons. Society for Neuroscience Abstracts 136.21.
64. French, A.S., Meisner, S., Lowe, J. and Torkkeli, P.H. (2012) Dynamic characterization of carbon dioxide transduction in Drosophila melanogaster antennal olfactory sensilla. Society for Neuroscience Abstracts 174.04.
63. Torkkeli P.H., Panek I. & Meisner S. (2011) Octopamine-induced increase in sensitivity in spider VS-3 mechanosensory neurons is mediated by Ca2+/calmodulin dependent protein kinase II. Eighth IBRO World Congress of Neuroscience. Florence, Italy, July 14-18, 2011, C270.
62. French, A.S., Torkkeli, P.H. and Schuckel, J. (2011) Dynamic properties of multiple olfactory neurons in Drosophila antennal basiconic sensilla. Eighth IBRO World Congress of Neuroscience. Florence, Italy, July 14-18, 2011, C222.
61. Pfeiffer, K., Torkkeli, P.H. and French, A.S. (2011) Information transmission is limited by entropy in spider mechanoreceptors. Ninth Göttingen Meeting of the German Neuroscience Society. T20-1B.
60. French, A.S., Schuckel, J. and Torkkeli, P.H. (2009) Excitatory and inhibitory pathways with differing dynamics in Drosophila olfactory receptors. Canadian Physiological Society Winter Meeting, Beaupré, Québec. 24.
59. Torkkeli, P.H., Pfeiffer, K., Meisner, S. and French, A.S. (2009) Long and short term effects of glutamate on spider mechanosensory neurons during random stimulation. Journal of Physiological Sciences 59: Supp. 1, 203.
58. French, A.S., Höger, U., Meisner, S. and Torkkeli, P.H. (2009) Calcium-based negative feedback on sensory transduction in spider mechanoreceptors. Journal of Physiological Sciences 59: Supp. 1, 203.
57. Pfeiffer, K., Höger, U., French, A.S. and Torkkeli, P.H. (2009) Differing effects of GABA and glutamate on spider (Cupiennius salei) mechanoreceptors. Eighth Göttingen Meeting of the German Neuroscience Society T20-6C.
56. Höger, U., Meisner, S., Torkkeli, P.H. and French, A.S. (2009) Mechanically induced regional changes in free intracellular Ca2+, and the effect of intracellular Ca2+ on mechanotransduction in spider sensory neurons. Eighth Göttingen Meeting of the German Neuroscience Society T20-6A.
55. Schuckel, J., Torkkeli, P.H. and French, A.S. (2009) Different fruit odors produce widely divergent dynamic responses in Drosophila antennal olfactory receptor neurons. Eighth Göttingen Meeting of the German Neuroscience Society T19-1A.
54. Höger, U., Meisner, S., Torkkeli, P.H. and French, A.S. (2008) Regional calcium changes in spider mechanoreceptors during sensory transduction. Society for Neuroscience Abstracts 271.2.
53. Pfeiffer K., Höger U., French A.S. and Torkkeli P.H. (2008) Mechanisms of GABAA receptor mediated excitation of spider mechanosensory neurons. Society for Neuroscience Abstracts 271.1.
52. Schuckel, J., Stengl, M., Torkkeli, P.H. and French, A.S. (2008) Dynamic characterization of Drosophila olfactory sensilla by random binary sequence stimulation. Society for Neuroscience Abstracts 65.5.
51. Pfeiffer K, Höger U, French A.S. and Torkkeli P.H. (2008) Membrane depolarization and the excitatory action of GABA and muscimol in spider mechanosensory neurons. Canadian Physiological Society Winter Meeting 2008, Lake Louise, Alberta, 22-23.
50. Schuckel, J., Meisner, S., Torkkeli, P.H. and French, A.S. (2008) Controlled dynamic stimulation of Drosophila olfactory receptors. Canadian Physiological Society Winter Meeting 2008, Lake Louise, Alberta, 23-24.
49. Pfeiffer K, Höger U, French A.S. and Torkkeli P.H. (2007) Excitatory effects of GABAA receptor activation in spider mechanosensory neurons. 8th Congress of the International Society for Neuroethology 236.
48. Schuckel, J., Meisner, S., Torkkeli, P.H. and French, A.S. (2007) Controlled dynamic stimulation of Drosophila olfactory receptors. 8th Congress of the International Society for Neuroethology 80.
47. Panek I., Höger U., French A.S. and Torkkeli P.H. (2007) Effects of voltage-gated conductances and intracellulr calcium on the GABA response of spider mechanosensory neurons. 7th IBRO World Congress of Neuroscience 383.
46. Höger, U., Torkkeli, P.H. and French, A.S. (2007) Ratiometric measurements of calcium concentration during sensory transduction in spider mechanoreceptors. 7th IBRO World Congress of Neuroscience 147.
45. Widmer A., Höger U., Meisner S., French A.S. and Torkkeli P.H. (2005) Spider peripheral mechanosensory neurons are directly innervated and modulated by octopaminergic efferents. 9th European Symposium of Insect Taste and Olfaction. P. 59.
44. Höger U., Torkkeli P.H. and French A.S. (2005) Calcium concentration changes in spider mechanoreceptors during sensory transduction. Society for Neuroscience Abstracts 31: 296.8.
43. Panek I., Meisner S. and Torkkeli P.H. (2005) Glutamate acts on inhibitory receptors on spider peripheral mechanoreceptors. Society for Neuroscience Abstracts 31: 296.7.
42. Panek, I., Meisner, S. and Torkkeli, P.H. (2005) Inhibitory glutamate receptors in spider peripheral mechanosensory neurons. Canadian Physiological Society Winter Meeting, Beaupré, Québec. 25.
41. Widmer, A., Höger, U, Meisner, S., French, A.S. and Torkkeli, P.H. (2004) Immunocytological and electrophysiological characterization of octopamine receptors in spider mechanosensilla. Society for Neuroscience Abstracts 30: 870.7.
40. Widmer, A., Höger, U., Meisner, S., French, A.S. and Torkkeli, P.H. (2003) Muscarinic ACh receptors on spider mechanosensilla. Society for Neuroscience Abstracts 29: 269.3.
39. Gingl, E., Panek, I., Torkkeli, P.H. and French, A.S. (2003) Localization of GABA mediated peripheral inhibition in spider mechanoreceptor neurons. Society for Neuroscience Abstracts 29: 269.2.
38. Panek I., Meisner S. and Torkkeli P.H. (2003) The distribution and function of metabotropic GABAB receptors in spider peripheral mechanosensilla. Göttingen Neurobiology Conference. Georg Thieme Verlag. 774-775.
37. Panek, I. and Torkkeli, P.H. (2001) GABA induced presynaptic inhibition of peripherally located parts of spider cuticular mechanosensory neurons. Proceedings of the International Union of Physiological Sciences XXXIV: A374.
36. Panek, I. and Torkkeli, P.H. (2001) GABA induced presynaptic inhibition of peripherally located parts of spider cuticular mechanosensory neurons. Central European Conference of Neurobiology. Krakow, Poland 11-15th of August. p.153.
35. Widmer, A., French, A.S. and Torkkeli, P.H. (2001) Acetylcholine receptors on cultured antennal cells of the moth Manduca sexta. Society for Neuroscience Abstracts 27: 392.11.
34. Panek, I., French, A.S., Seyfarth, E.-A., Sekizawa, S.-i. and Torkkeli, P.H. (2001) GABAergic modulation of spider mechanosensory afferents. Society for Neuroscience Abstracts 27: 156.8.
33. Torkkeli, P.H. and French, A.S. (2001) A model of excitability in spider mechanoreceptor neurons confirms that sodium inactivation controls their rapid adaptation. Society for Neuroscience Abstracts 27: 820.10.
32. Panek I. and Torkkeli P.H. (2001) GABA induced presynaptic inhibition of peripherally located parts of spider cuticular mechanosensory neurons. Proceedings of the International Union of Physiological Sciences XXXIV: A374.
31. French, A.S. and Torkkeli, P.H. (2001) The ionic basis of rapid sensory adaptation in paired spider mechanoreceptor neurons with different adaptation properties. Proceedings of the International Union of Physiological Sciences XXXIV: A373.
30. French, A.S., Sekizawa, S.-i., Höger, U. and Torkkeli, P.H. (2000) Nonlinear models of action potential firing in paired mechanoreceptor neurons. Annals of Biomedical Engineering 28: S33.
29. French, A.S., Höger, U.,Sekizawa, S.-i. and Torkkeli, P.H. (2000) Frequency response functions for mechanical and electrical stimulation of a spider slit sense organ. Society for Neuroscience Abstracts 26: 66.7.
28. Torkkeli, P.H., Sekizawa, S.-i and French, A.S. (2000) Inactivation of Na+ currents contributes to the adaptation of paired spider mechanosensory neurons. Society for Neuroscience Abstracts 26: 66.8.
27. Torkkeli, P.H. and French, A.S. (1999) Stretch-activated ion channels in cultured mechanosensory neurons of Manduca sexta. Biophysical Journal 76: A203.
26. Sekizawa, S.-i., French, A.S., Höger, U. and Torkkeli, P.H. (1999) Voltage-activated outward currents in two types of spider mechanoreceptor neurons. Biophysical Journal 76: A77.
25. Sekizawa, S.-i., French, A.S. and Torkkeli, P.H. (1999) Calcium currents in spider mechanosensory neurons. Society for Neuroscience Abstracts 25: 726.
24. Sekizawa, S.-i., French, A.S., Höger, U. and Torkkeli, P.H. (1998) Contributions of voltage-activated outward currents to adaptation properties in two types of spider mechanoreceptor neurons. Physiology Canada 29: 184.
23. Torkkeli, P.H. and French, A.S. (1998) A new preparation of in vitro mechanoreceptor neurons from the moth, Manduca sexta. Physiology Canada 29: 187.
22. Höger, U., Torkkeli, P.H. Seyfarth, E.-A. and French A.S. (1997) The ionic basis of the transduction current in spider slit-sense organ mechanoreceptor neurons. Proceedings of the 25th Göttingen Neurobiology Conference. p 253.
21. Torkkeli, P.H., Höger, U. Seyfarth E.-A. and French A.S. (1997) Ionic selectivity of mechanically-activated ion channels in a spider mechanoreceptor. Society for Neuroscience Abstracts 23: 1572.
20. Torkkeli, P.H. and French, A.S. (1996) Dissociated cockroach mechanoreceptor neurons in culture. Progress in Biophysics and Molecular Biology 65 (Supplement 1): 181.
19. Torkkeli, P.H. and French, A.S. (1995) Delayed potassium currents in an insect cuticular mechanoreceptor neuron. Biophysical Journal 68: A38.
18. Torkkeli, P.H. and French, A.S. (1994) Adaptation in an insect mechanoreceptor neuron involves both outward and inward currents. Biophysical Journal 66: A167.
17. Torkkeli, P.H. and French, A.S. (1993) The role of outward currents in the adaptation of an insect mechanoreceptor neuron. Physiology Canada 24: 141.
16. French, A.S. and Torkkeli, P.H. (1993) The ionic mechanisms of rapid adaptation in a mechanosensory neuron. Proceedings of the International Union of Physiological Sciences XXXII: 278.5.
15. French, A.S. and Torkkeli, P.H. (1993) Potassium currents in a rapidly adapting insect mechanosensory neuron. Society for Neuroscience Abstracts 19: 338.
14. Torkkeli, P.H. and French, A.S. (1992) Ionic currents in a rapidly adapting mechanosensory neuron. Physiology Canada 23: 115.
13. Torkkeli, P.H. and French, A.S. (1992) Ionic currents underlying rapid sensory adaptation in the cockroach tactile spine. Society for Neuroscience Abstracts 18: 301.
12. Torkkeli, P.H. and French, A.S. (1991) Mapping the action potential initiation region of an insect sensory neuron. Physiology Canada 22: 191.
11. French, A.S., Stockbridge, L.L. and Torkkeli, P.H. (1991) A nonlinear model of action potential encoding in a rapidly adapting sensory neuron. Proceedings of the 13th. International Conference of the IEEE/EMBS 13: 2260-2261.
10. Torkkeli, P.H., Weckström, M. and Jörvilehto, M. (1990) The receptor potential absent (rpa) mutant of the blowfly, Calliphora erythrocephala. In: Uusitalo, H., Palkama, A. and Mahlberg, K. (Eds.) Proceedings of the International Society for Eye Research (Helsinki) VI: 1007.
9. Torkkeli, P.H., Weckström, M. and Jörvilehto, M. (1990) Maintenance of photoreceptor membrane in normal and rpa (receptor potential absent) mutant blowfly. In: Uusitalo, H., Palkama, A. and Mahlberg, K. (Eds.) Proceedings of the International Society for Eye Research (Helsinki) VI: 200.
8. Torkkeli, P.H., Weckström, M. and Jörvilehto, M. (1990) Influence of rpa-mutation to the turnover of photoreceptor cells of the blowfly. In: Elsner N. & Roth G. (Eds.) Proc. 18. Göttingen Neurobiology Conference, Georg Thieme Verlag, Stuttgart, New York, p. 202.
7. Jörvilehto, M., Harjula, R., Torkkeli, P.H., Syrjökallio, M. and Weckström, M. (1990) Tuning of dipteran rhabdomeral optics studied by interventions in deep pseudopupil (DPP). In: Uusitalo, H., Palkama, A. and Mahlberg, K. (Eds.) Proceedings of the International Society for Eye Research (Helsinki) VI: 201.
6. Jörvilehto, M., Harjula, R., Torkkeli, P.H. and Weckström, M. (1990) Are optics in neural superposition eyes tuned by an interstitial matrix. In: Elsner N. & Roth G. (Eds.) Proc. 18 Göttingen Neurobiology Conference, Georg Thieme Verlag, Stuttgart, New York, 201.
5. Torkkeli, P.H., Jörvilehto, M. and Weckström, M. (1989) Age dependent maintenance of photoreceptor membranes in blowfly. Proceedings of the International Union of Physiological Sciences XXXI: 3421.
4. Jörvilehto, M., Torkkeli, P.H. and Harjula, R. (1989) The putative role of actin in the inner space of the open type ommatidia in the compound eye. Soc. Neurosc. Abst. 15: 1292.
3. Weckström, M., Korkalainen, J., Kouvalainen, E., Heimonen, K., Torkkeli, P.H. and Jörvilehto, M. (1988) A model for information transmission across the first synapse in the fly visual system. In: Malmivuo J., Nousiainen J. (eds.) Proc. VI Natl. Meet. Biophys. & Med. Eng., Helsinki, 185-188.
2. Heimonen, K., Weckström, M., Kouvalainen, E., Korkalainen, J., Torkkeli, P.H. and Jörvilehto, M. (1988) Spectral and shot noise analysis of voltage noise in blowfly photoreceptors. In: Malmivuo, J., Nousiainen, J. (eds.) Proc. VI Natl. Meet. Biophys. & Med. Eng., Helsinki, 181-184.
1. Torkkeli, P.H., Weckström, M., Kouvalainen, E. and Jörvilehto, M. (1987) Retinal degeneration mutation in blowfly: Functional and ultrastructural analysis. Neurosci. 22 (Suppl.): 1240.

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