Free calcium ion concentration in the sieve-tube sap of Ricinus communis L. seedlings

Planta ◽  
1998 ◽  
Vol 206 (1) ◽  
pp. 103-107 ◽  
Author(s):  
Moni Brauer ◽  
Wen-Jun Zhong ◽  
Till Jelitto ◽  
Christian Schobert ◽  
Dale Sanders ◽  
...  
Keyword(s):  
Calcium Ion ◽  
Ricinus Communis ◽  
Sieve Tube ◽  
Ion Concentration ◽  
Free Calcium ◽  
Ricinus Communis L ◽  
Calcium Ion Concentration

Bile canalicular contraction in the isolated hepatocyte doublet is related to an increase in cytosolic free calcium ion concentration

2008 ◽  
Vol 8 (3) ◽  
pp. 178-183 ◽  
Author(s):  
Sumio Watanabe ◽  
Masahiro Tomono ◽  
Makoto Takeuchi ◽  
Tsuneo Kitamura ◽  
Miyoko Hirose ◽  
...  
Keyword(s):  
Calcium Ion ◽  
Ion Concentration ◽  
Free Calcium ◽  
Cytosolic Free Calcium ◽  
Bile Canalicular Contraction ◽  
Calcium Ion Concentration

scholarly journals The gravistimulation-induced very slow Ca2+ increase in Arabidopsis seedlings requires MCA1, a Ca2+-permeable mechanosensitive channel

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Masataka Nakano ◽  
Takuya Furuichi ◽  
Masahiro Sokabe ◽  
Hidetoshi Iida ◽  
Hitoshi Tatsumi
Keyword(s):  
Calcium Ion ◽  
Channel Blocker ◽  
Upright Position ◽  
Ion Concentration ◽  
Early Event ◽  
Free Calcium ◽  
Permeable Channel ◽  
Mechanosensitive Ion Channel ◽  
And Function ◽  
Calcium Ion Concentration

AbstractGravity is a critical environmental factor affecting the morphology and function of plants on Earth. Gravistimulation triggered by changes in the gravity vector induces an increase in the cytoplasmic free calcium ion concentration ([Ca2+]c) as an early process of gravity sensing; however, its role and molecular mechanism are still unclear. When seedlings of Arabidopsis thaliana expressing apoaequorin were rotated from the upright position to the upside-down position, a biphasic [Ca2+]c-increase composed of a fast-transient [Ca2+]c-increase followed by a slow [Ca2+]c-increase was observed. We find here a novel type [Ca2+]c-increase, designated a very slow [Ca2+]c-increase that is observed when the seedlings were rotated back to the upright position from the upside-down position. The very slow [Ca2+]c-increase was strongly attenuated in knockout seedlings defective in MCA1, a mechanosensitive Ca2+-permeable channel (MSCC), and was partially restored in MCA1-complemented seedlings. The mechanosensitive ion channel blocker, gadolinium, blocked the very slow [Ca2+]c-increase. This is the first report suggesting the possible involvement of MCA1 in an early event related to gravity sensing in Arabidopsis seedlings.

Dependence of Cardiac Contractility on Myofibrillar Calcium Sensitivity

Physiology ◽  
1987 ◽  
Vol 2 (5) ◽  
pp. 179-182
Author(s):  
JC Ruegg
Keyword(s):  
Calcium Ion ◽  
Sarcomere Length ◽  
Cardiac Contractility ◽  
Calcium Sensitivity ◽  
Ion Concentration ◽  
Free Calcium ◽  
Wide Range ◽  
Heart Contractility ◽  
Calcium Ion Concentration

In the heart, contractility may be varied over a wide range. It is determined mainly by the myoplasmic free calcium ion concentration. However, alteration of the responsiveness of the myofilaments to calcium may also be important in regulating cardiac contractility, in particular following changes in sarcomere length, or in hypoxia, or after interventions with certain novel cardiotonic drugs.

Cold-induced cytosolic free calcium ion concentration changes in wheat

2009 ◽  
Vol 166 (17) ◽  
pp. 1955-1960 ◽  
Author(s):  
J. Nagel-Volkmann ◽  
C. Plieth ◽  
D. Becker ◽  
H. Lüthen ◽  
K. Dörffling
Keyword(s):  
Calcium Ion ◽  
Ion Concentration ◽  
Free Calcium ◽  
Cytosolic Free Calcium ◽  
Concentration Changes ◽  
Calcium Ion Concentration

scholarly journals Oscillatory membrane potential changes in cells of mesenchymal origin: the role of an intracellular calcium regulating system

1979 ◽  
Vol 81 (1) ◽  
pp. 49-61
Author(s):  
P. G. Nelson ◽  
M. P. Henkart
Keyword(s):  
Endoplasmic Reticulum ◽  
Membrane Potential ◽  
Intracellular Calcium ◽  
Calcium Ion ◽  
Surface Membrane ◽  
Ion Concentration ◽  
Free Calcium ◽  
Potassium Ions ◽  
Calcium Ion Concentration

A number of mesenchymal cells (fibroblasts, macrophages and megakaryocytes) respond to a variety of stimuli with large hyperpolarizations lasting several seconds (the H.A. response). The H.A. responses can occur as repetitive trains or oscillations. These hyperpolarizations are due to an increase of the surface membrane permeability to potassium ions which is probably mediated by an increase in the cytoplasmic free calcium ion concentration. Evidence is discussed which suggests that the source of this increased calcium, is least in part, an intracellular sequestering system, probably the endoplasmic reticulum. A model capable of producing oscillatory changes in membrane potential is proposed based on such an intracellular calcium sequestering and releasing system.

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