MARC details
| 000 -LEADER |
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| fixed length control field |
02609nam a2200265Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20250625140628.0 |
| 040 ## - CATALOGING SOURCE |
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| Transcribing agency |
CICY |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
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| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
B-10268 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT |
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| Title |
Properties of the K § Inward Rectifier in the Plasma Membrane of Xylem Parenchyma Cells from Barley Roots: Effects of TEA § Ca 2§ Ba 2§ and La 3§ |
| 490 0# - SERIES STATEMENT |
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| Volume/sequential designation |
Journal of Membrane Biology, 142(3), p.363-379, 1994 |
| 520 3# - SUMMARY, ETC. |
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| Summary, etc. |
Xylem parenchyma cells are situated around the (apoplastic)xylem vessels and are involved in the control of the composition of the xylem sap by exporting and resorbing solutes. We investigated properties of the K § inward rectifier in the plasma membrane of these cells by performing patch clamp experiments on protoplasts in the whole-cell configuration. Inward currents were sensitive to the K § channel blocker TEA § at a high concentration (20 mu). Barium, another "classical" K + channel blocker, inhibited K § currents with a K i of about 1.3 lnU. In contrast to guard cells, the cytosolic Ca 2+ level proved to be ineffective in regulating the K + conductance at hyperpolarization. External Ca 2+ blocked currents weakly in a voltage-dependent manner. From instantaneous current-voltage curves, we identified a binding site in the channel pore with an electrical distance of about 0.2 to 0.5. Lanthanum ions reduced the inward current in a voltage-dependent manner and simultaneously displaced the voltage at which half of the channels are in the open state to more positive values. This finding was interpreted as resulting from a sum of two molecular effects, an interaction with the mouth of the channel that causes a reduction of current, and a binding to the voltage sensor, leading to a shielding of surface charges and, subsequently, a modulation of channel gating. A comparison between the K § inward rectifier in xylem parenchyma cells, guard cells and KAT1 from Arabidopsis leads to the conclusion that these rectifiers form subtypes within one class of ion channels. The ineffectiveness of Ca 2§ to control K § influx in xylem parenchyma cells is interpreted in physiological terms. |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
ROOT |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
XYLEM PARENCHYMA CELL |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
K § INWARD RECTIFIER |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
CA 2§ |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
LA 3+ |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
BA 2+ |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Wegner, L.H. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
De Boer, A.H. |
| 700 12 - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Raschke, K. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS |
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| Uniform Resource Identifier |
<a href="https://drive.google.com/file/d/1YbdZLlUNVTZGH93NYfpmhx91s35euEY8/view?usp=drivesdk">https://drive.google.com/file/d/1YbdZLlUNVTZGH93NYfpmhx91s35euEY8/view?usp=drivesdk</a> |
| Public note |
Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Source of classification or shelving scheme |
Clasificación local |
| Koha item type |
Documentos solicitados |
