PMID: 12769920Feb 21, 1997Paper

Two excitatory motoneurons differ in quantal content of their junctional potentials in abdominal muscle fibers of the cricket, Gryllus bimaculatus

Journal of Insect Physiology
H Kita, F Kawasaki

Abstract

In abdominal muscles 202 and 203 of the cricket, Gryllus bimaculatus, large and small excitatory junctional potentials (l- and s-EJPs) with similar durations can be recorded from the same muscle fibers. At the normal extracellular calcium ion concentration ([Ca(2+)](o)) of 5mM, the amplitudes of l-EJPs in both muscles were larger than the threshold membrane potential for muscle action potentials, which is about -40mV. Below 0.75mM [Ca(2+)](o), the amplitudes became much smaller and were below the firing level for the action potentials. At 0.5mM, they fluctuated and decreased to 10.3 and 1.9mV in muscles 202 and 203, respectively, and at 0.25mM frequent failures occurred. The amplitudes of s-EJPs at 5mM [Ca(2+)](o) were 13.3 and 5.1mV in muscles 202 and 203, respectively, and the fluctuating amplitudes were far below the threshold for muscle action potentials. Below 0.75mM, s-EJPs were rarely observed. The relation between log(EJP amplitude) and log([Ca(2+)](o)) was linear within a certain range of [Ca(2+)](o) and the slopes of the lines for l-EJPs were about twice as steep as those for s-EJPs in both muscles. In muscle 202, the amplitude distribution of l-EJPs obtained at 0.25mM and that of s-EJPs at 0.75mM both showed peaks at...Continue Reading

References

Oct 1, 1976·The Journal of Physiology·L Y Jan, Y N Jan
Oct 1, 1988·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·K Yamaoka, K Ikeda
Dec 1, 1972·The Journal of Physiology·P N Usherwood
Dec 13, 1974·Nature·R Anwyl, P N Usherwood
Oct 1, 1966·Journal of Insect Physiology·H I Runion, P N Usherwood
Nov 1, 1967·The Journal of Physiology·F A Dodge, R Rahamimoff
Jan 1, 1981·Cell and Tissue Research·R H Hill, C K Govind
Jan 15, 1994·The Journal of Physiology·R RivosecchiA Mallart
Oct 1, 1994·Physiological Reviews·W Van der Kloot, J Molgó
Nov 8, 1994·Proceedings of the National Academy of Sciences of the United States of America·J T LittletonH J Bellen
Aug 1, 1994·Journal of Neurophysiology·L Landò, R S Zucker
Oct 28, 1955·The Journal of Physiology·A R MARTIN
Nov 1, 1959·The Journal of General Physiology·J A CERFF V McCANN
Mar 1, 1964·The Journal of Physiology·A TAKEUCHI, N TAKEUCHI
Nov 1, 1963·The Journal of Physiology·P N Usherwood

❮ Previous
Next ❯

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.