Quantitative comparison of low- and high-output neuromuscular synapses from a motoneuron of the lobster (Homarus americanus)

1979 ◽  
Vol 198 (3) ◽  
Author(s):  
C.K. Govind ◽  
D.E. Meiss
Keyword(s):  
Homarus Americanus ◽  
Quantitative Comparison ◽  
Neuromuscular Synapses ◽  
High Output

Polyneuronal innervation of an adult and embryonic lobster muscle

Development ◽  
1985 ◽  
Vol 87 (1) ◽  
pp. 13-26
Author(s):  
c. K. Govind ◽  
Philip J. Stephens ◽  
Judith S. Eisen
Keyword(s):  
Homarus Americanus ◽  
Inhibitory Synapses ◽  
Neuromuscular Synapses ◽  
Extensor Muscles ◽  
Full Complement ◽  
Section Electron ◽  
Innervation Patterns ◽  
The Common ◽  
Serial Section Electron Microscopy ◽  
Polyneuronal Innervation

Motor innervation of the deep extensor muscle in the abdomen of lobsters (Homarus americanus) was compared in adults and embryos using electrophysiological techniques. There is widespread innervation of the adult muscle by the common excitor and inhibitor axons and regionally restricted or private innervation by three more excitor axons. In the embryo the earliest sign of functional innervation revealed a single inhibitory and two to three excitatory axons thus denoting simultaneous innervation by the full complement of axons. In corroboration, serial-section electron microscopy revealed several axon profiles invading the embryonic deep extensor muscles and giving rise to well-defined neuromuscular synapses with presynaptic dense bars. Innervation patterns to homologous regions of the embryonic and adult muscles were similar, consisting of a few large inhibitory synapses and many small excitatory ones. Consequently the adult pattern of polyneuronal innervation occurs simultaneously and in toto during embryonic development.

Neuromuscular synapses on the dactyl opener muscle of the lobster Homarus americanus

2006 ◽  
Vol 326 (3) ◽  
pp. 823-834
Author(s):  
Jonna Hamilton ◽  
Richard M. Dillaman ◽  
Mary Kate Worden
Keyword(s):  
Homarus Americanus ◽  
Neuromuscular Synapses

Regional Differentiation of Neuromuscular Synapses in a Lobster Receptor Muscle

1979 ◽  
Vol 79 (1) ◽  
pp. 99-114
Author(s):  
DENNIS E. MEISS ◽  
C. K. GOVIND
Keyword(s):  
Large Amplitude ◽  
Small Amplitude ◽  
Homarus Americanus ◽  
Membrane Properties ◽  
Muscle Membrane ◽  
Regional Differentiation ◽  
Muscle Fibres ◽  
Flexor Muscle ◽  
Neuromuscular Synapses ◽  
A Minor

Properties of the synapses and muscle fibres of the distal accessory flexor muscle (DAFM) were examined in the first and second walking legs of the lobster, Homarus americanus. Stimulation of the single excitor axon produces large amplitude, poorly facilitating excitatory postsynaptic potentials (EPSPs) in the distally located fibres and small amplitude, highly facilitating EPSPs in the proximally located fibres. The input resistances (Rin) of the muscle fibres were correlated with EPSP properties such that small amplitude, highly facilitating EPSPs occurred in fibres with low Rin and large amplitude, poorly facilitating EPSPs occurred in fibres with higher Rin. All muscle fibres were similar for other membrane electrical properties. Regression analyses however show a minor contribution of Rin to the size of intracellularly recorded synaptic potentials and to their facilitation properties. Thus, differences in muscle membrane properties cannot explain the observed diversity in EPSPs. Instead EPSP diversity is based on differences in transmitter output at single synaptic foci: highly facilitating synapses with low quantal release occur only on proximally located muscle fibres and poorly facilitating synapses with high release occur only on distally located ones. Thus, the EPSP diversity from the single excitor axon to the lobster DAFM is largely presynaptic in origin.

Presynaptic dense bars at neuromuscular synapses of the lobster, Homarus americanus

1980 ◽  
Vol 207 (1) ◽  
pp. 81-88 ◽  
Author(s):  
C. K. Govind ◽  
R. A. De Rosa ◽  
Joanne Pearce
Keyword(s):  
Homarus Americanus ◽  
Neuromuscular Synapses

Toward an alignment of the actin molecule within the actin filament

1983 ◽  
Vol 41 ◽  
pp. 450-451
Author(s):  
P.R. Smith ◽  
W.E. Fowler ◽  
U. Aebi
Keyword(s):  
Actin Filament ◽  
Diffraction Data ◽  
Quantitative Estimate ◽  
Molecular Model ◽  
Quantitative Comparison ◽  
Regulatory Proteins ◽  
Essential Information ◽  
X Ray ◽  
Maximum Resolution ◽  
Lack Of Information

An understanding of the specific interactions of actin with regulatory proteins has been limited by the lack of information about the structure of the actin filament. Molecular actin has been studied in actin-DNase I complexes by single crystal X-ray analysis, to a resolution of about 0.6nm, and in the electron microscope where two dimensional actin sheets have been reconstructed to a maximum resolution of 1.5nm. While these studies have shown something of the structure of individual actin molecules, essential information about the orientation of actin in the filament is still unavailable.The work of Egelman & DeRosier has, however, suggested a method which could be used to provide an initial quantitative estimate of the orientation of actin within the filament. This method involves the quantitative comparison of computed diffraction data from single actin filaments with diffraction data derived from synthetic filaments constructed using the molecular model of actin as a building block. Their preliminary work was conducted using a model consisting of two juxtaposed spheres of equal size.

The quantitative comparison of experimental and simulated diffraction contrast images

1995 ◽  
Vol 53 ◽  
pp. 102-103
Author(s):  
Stuart McKernan
Keyword(s):  
Image Processing ◽  
Personal Computer ◽  
Close Agreement ◽  
Quantitative Comparison ◽  
Image Simulation ◽  
Computing Power ◽  
Diffraction Contrast ◽  
Simulated Images ◽  
Made In

For many years the concept of quantitative diffraction contrast experiments might have consisted of the determination of dislocation Burgers vectors using a g.b = 0 criterion from several different 2-beam images. Since the advent of the personal computer revolution, the available computing power for performing image-processing and image-simulation calculations is enormous and ubiquitous. Several programs now exist to perform simulations of diffraction contrast images using various approximations. The most common approximations are the use of only 2-beams or a single systematic row to calculate the image contrast, or calculating the image using a column approximation. The increasing amount of literature showing comparisons of experimental and simulated images shows that it is possible to obtain very close agreement between the two images; although the choice of parameters used, and the assumptions made, in performing the calculation must be properly dealt with. The simulation of the images of defects in materials has, in many cases, therefore become a tractable problem.

Ernährungsintervention zur Regulation des High-Output Syndroms bei intestinalen Stomata

2019 ◽  
Author(s):  
T Guhl ◽  
C Siegmann-Thoss ◽  
M Adolph
Keyword(s):  
High Output

Pränatale Diagnose und Therapie zweier fetaler AV-Malformationen mit High-Output-Syndrom

2005 ◽  
Vol 127 (03) ◽  
Author(s):  
D Kamil ◽  
A Geipel ◽  
A Kempe ◽  
J Breuer ◽  
U Gembruch ◽  
...  
Keyword(s):  
Pränatale Diagnose ◽  
Diagnose Und Therapie ◽  
High Output

The importance of a holistic approach to stoma care: A case review

WCET Journal ◽  
2019 ◽  
pp. 23-32
Author(s):  
Melanie C Perez
Keyword(s):  
Ileal Conduit ◽  
Enterocutaneous Fistula ◽  
Foley Catheter ◽  
Holistic Approach ◽  
Comprehensive Care ◽  
Case Review ◽  
High Output ◽  
Stoma Care

This case review discusses the importance of providing a holistic approach to the care of a patient with two stomas and an enterocutaneous fistula. In this case, the stomas and fistula significantly affected the patient; not just physically but emotionally and socially. The different challenges that arose in pouching a high-output ileostomy, enterocutaneous fistula and ileal conduit with Foley catheter in situ are explored. It also delves into the various options for discharging a patient with complex ostomy complications requiring different needs and resources. Finally, it aims to highlight the therapeutic comprehensive care the stomal therapy nurse provided to the patient and their family.

Growth of juvenile American lobster Homarus americanus in a changing environment

2016 ◽  
Vol 557 ◽  
pp. 177-187 ◽  
Author(s):  
MD McMahan ◽  
DF Cowan ◽  
Y Chen ◽  
GD Sherwood ◽  
JH Grabowski
Keyword(s):  
Homarus Americanus ◽  
American Lobster ◽  
Changing Environment
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