Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Hans Machemer"'
Autor:
Hans Machemer
Publikováno v:
European Journal of Protistology. 37:3-14
The properties of motility and sensory organisation of unicellular organisms suggest that cells were able to utilise the resources of their fluid environment before they had developed senses for its exploration. Two principles of locomotion, helical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e63a0903335d0f04b87102770f0e406
https://doi.org/10.1078/0932-4739-00816
https://doi.org/10.1078/0932-4739-00816
Autor:
Ute Nagel, Hans Machemer
Publikováno v:
European Journal of Protistology. 36:161-168
Summary Low concentrations (4 to 10 μM) of the trivalent cation gadolinium raised the input resistance and altered the membrane potential of Paramecium tetraurelia suggesting an interference with membrane channels. Current-clamp conditions revealed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14bf7de288729439eb25364bea954333
https://doi.org/10.1016/s0932-4739(00)80036-x
https://doi.org/10.1016/s0932-4739(00)80036-x
Autor:
Hans Machemer, Ute Nagel
Publikováno v:
Journal of Experimental Biology. 203:1059-1070
Wild-type and the morphological mutant kin 241 of Paramecium tetraurelia showed improved orientation away from the centre of gravity (negative gravitaxis) when accelerations were increased from 1 to 7 g. Gravitaxis was more pronounced in the mutant.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::567a50c8de8d320077da1dcc1437855e
https://doi.org/10.1242/jeb.203.6.1059
https://doi.org/10.1242/jeb.203.6.1059
Publikováno v:
Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology. 185:517-527
We investigated the autotrophic flagellate Euglena gracilis for gravity-induced modulation of the speed of swimming as previously documented for larger protozoan cells. Methods of video-tracking of swimming and sedimenting cells under 1 g and hypergr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be4693c201c13ff98f21030b942b7453
https://doi.org/10.1007/s003590050412
https://doi.org/10.1007/s003590050412
Autor:
Richard Bräucker, Martin Weskamp, Sigrun Machemer-Röhnisch, Dorothea Charlotte Neugebauer, Hans Machemer, Ute Nagel
Publikováno v:
European Journal of Protistology. 34:254-261
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38a444225e83cfbfb81aeab743d5baf6
https://doi.org/10.1016/s0932-4739(98)80051-5
https://doi.org/10.1016/s0932-4739(98)80051-5
Publikováno v:
Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology. 183:303-311
Effects of the density of the external medium on gravireception in Loxodes striatus were investigated using Percoll solutions. With increasing density, the swimming rates changed from prevailing in the downward direction to prevailing in the upward d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::369f0dbf481bea2d1d9a17a6f1611649
https://doi.org/10.1007/s003590050257
https://doi.org/10.1007/s003590050257
Publikováno v:
The Journal of Eukaryotic Microbiology. 45:411-418
Cells of Loxodes striatus were adjusted to defined culturing, experimental solution O2-supply, temperature, and state of equilibration to be subjected to step type transition of acceleration from normal gravity, (1 g) to the weightless condition (mic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::04e4cb45d5750fed0ce836e3632e8d78
https://doi.org/10.1111/j.1550-7408.1998.tb05092.x
https://doi.org/10.1111/j.1550-7408.1998.tb05092.x
Publikováno v:
European Journal of Protistology. 34:82-92
Summary Paramecium caudatum cells were fed with iron-particles to increase the density of the cytoplasm. The swimming speed and orientation of iron-fed and iron-free control cells were analyzed under terrestrial gravity and raised acceleration up to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec578362676c68a21cbac7560b0adc03
https://doi.org/10.1016/s0932-4739(98)80043-6
https://doi.org/10.1016/s0932-4739(98)80043-6
Publikováno v:
European Journal of Protistology. 33:284-294
Summary The gliding locomotion of Loxodes on solid surfaces is commonly curved in the counterclockwise direction. Experiments using K+-dependent modulation of the membrane potential showed that depolarization induced gliding tracks of clockwise curva
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa88e97b07e59b3c4d562ad738220835
https://doi.org/10.1016/s0932-4739(97)80006-5
https://doi.org/10.1016/s0932-4739(97)80006-5
Publikováno v:
European Journal of Protistology. 32:90-93
Summary Negative gravikinesis is an acceleration-activated modulation of vertical swimming velocity which can neutralize the passive sedimentation of ciliates. This paper investigates effects of swimming velocity levels on gravikinesis. Evaluation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b39d7d9390ab2080d83c9ed2786b922e
https://doi.org/10.1016/s0932-4739(96)80083-6
https://doi.org/10.1016/s0932-4739(96)80083-6