Two subtypes of C current in identified Helix neurons

Basic concepts and physical-chemical phenomena, that have conceptual meaning for the formation of systemic clinical thinking and formalization of the knowledge of systemic structural-functional organization of the human’s organism

From the point of view of perception and generalization processes there are complex, logic and conceptual forms of thinking. Its conceptual form is the highest result of interaction between thinking and speech. While realizing it, human uses the concept, which are logically formed thoughts, that are the meaning of representation in thinking of unity of meaningful features, relations of subjects or phenomena of objective reality. Special concepts, that are used in the science and technique are called terms. They perform a function of corresponding, special, precise marking of subjects and phenomena, their features and interactions. Scientific knowledge are in that way an objective representation of material duality in our consciousness. Certain complex of terms forms a terminological system, that lies in the basis of corresponding sphere of scientific knowledge and conditions a corresponding form and way of thinking. Clinical thinking is a conceptual form, that manifests and represents by the specialized internal speech with gnostic motivation lying in its basis. Its structural elements are corresponding definitions, terms and concepts. Cardinal features of clinical systems are consistency, criticality, justification and substantiation. Principles of perception and main concepts are represented in the article along with short descriptions of physical and chemical phenomena, that have conceptual meaning for the formation of systematic clinical thinking and formalization of systemic structural-functional organization of the human’s organism

Decreases in Ca2+-dependent K+-currents due to cyclic guanosine monophosphate are not dependent on phosphorylation

Two-microelectrode voltage clamping experiments were performed on isolated snail neurons to measure the Ca2+-dependent. potential-dependent K+ current (I(C)), with assessment of the effects of penetrating cGMP analogs on this current - dibutyryl cGMP (dcGMP) and 8-Br-cGMP. Both of these penetrating cGMP analogs rapidly and reversibly decreased the amplitude of I(C). cGMP analogs produced no shifts in the volt-ampere characteristics of the efflux current along the voltage axis. dcGMP and 8-Br-cGMP had no effect on the influx Ca2+ current. The non-specific protein kinase inhibitor H-8 decreased or had no effect on I(C) in different cells. The effects of both dcGMP and 8-Br-cGMP persisted in the presence of H-8. Decreases in I(C) in the presence of cGMP analogs also persisted in the presence of the protein phosphatase inhibitor okadaic acid. These results lead to the conclusion that decreased conductivity of Ca2+-dependent K+ channels occurring in response to cGMP is not associated with phosphorylation.

Characterization and decomposition of voltage-activated ionic currents using a fitting numerical method

The application of a computer-based numerical method for fast determination of the kinetic parameters of voltage-activated ionic currents is described. Currents with different kinetics and ionic backgrounds are fitted satisfactorily with Hodgkin-Huxley-like functions, and multicomponent currents are decomposed. The method offers a way to separate ionic-current components without pharmacological isolation.