Discrete wavelet transform analysis of surface electromyography for the fatigue assessment of neck and shoulder muscles.

Assessment of neuromuscular fatigue is essential for early detection and prevention of risks associated with work-related musculoskeletal disorders. In recent years, discrete wavelet transform (DWT) of surface electromyography (SEMG) has been used to evaluate muscle fatigue, especially during dynamic contractions when the SEMG signal is non-stationary. However, its application to the assessment of work-related neck and shoulder muscle fatigue is not well established.

Supplier selection based on a neural network model using genetic algorithm.

In this paper, a decision-making model was developed to select suppliers using neural networks (NNs). This model used historical supplier performance data for selection of vendor suppliers. Input and output were designed in a unique manner for training purposes.

Benthic impacts of intertidal oyster culture, with consideration of taxonomic sufficiency.

An investigation of the impacts from elevated intertidal Pacific oyster culture in a New Zealand estuary showed enhanced sedimentation beneath culture racks compared with other sites. Seabed elevation beneath racks was generally lower than between them, suggesting that topographic patterns more likely result from a local effect of rack structures on hydrodynamic processes than from enhanced deposition. Compared with control sites, seabed sediments within the farm had a greater silt/clay and organic content, and a lower redox potential and shear strength.

The role of the sodium pump during prolonged end-plate currents in guinea-pig diaphragm.

1. Depolarization caused by carbachol or decamethonium is followed by spontaneous recovery of membrane potential in the presence of the drug. The involvement of the Na pump in this recovery has been investigated in guinea-pig diaphragm at 37 degrees C.

Recovery from decamethonium in rat muscle and denervated guinea-pig diaphragm.

1. In denervated guinea-pig diaphragm the depolarization produced by decamethonium (100 microM) was followed by an initial phase of recovery, and then by a slow restoration of membrane potential in the presence of the drug, with hyperpolarization. Membrane potentials were measured by repeated insertions.

Analysis of inter- and intra-specific competition amongst intertidal limpets with different methods of feeding.

The prosobranch limpet Cellana tramoserica grazes on microalgae, including the spores of macroalgae, and coexists with the pulmonate limpets Siphonaria denticulata and S. virgulata at mid-tidal levels on sandstone shores in New South Wales. These siphonarians graze on macroalgae, leaving the basal parts of the thalli intact.

Distribution and abundance of the acmaeid limpet, Patelloida latistrigata, and its interaction with barnacles.

At Cape Banks, New South Wales, adults of the small intertidal limpet, Patelloida latistrigata occur exclusively in the barnacle zone, and are primarily associated with the barnacle, Tesseropora rosea. Limpet density increases with barnacle density. Juvenile limpets can be found throughout the barnacle zone, and on patches of bare rock that may be temporarily available at lower levels on the shore.

Spontaneous recovery from depolarizing drugs in rat diaphragm.

1. The end-plate region in surface fibres of rat diaphragm was located by the use of polarizing filters. 2.

An analysis of distribution and abundance of populations of the high-shore limpet, Notoacmea petterdi (tenison-woods).

Notoacmea petterdi occurs only on vertical surfaces at the highest levels on the shore. On a given surface, density of limpets decreases with increasing height. Mean and maximum sizes of limpets increase with increasing height, due to faster rates of growth at higher levels where densities are lower.

Sodium entry in rat diaphragm induced by depolarizing drugs.

1. An increased uptake of labelled sodium was found in the end-plate region of rat diaphragm following brief exposure to solution containing (24)Na plus carbachol (100 muM), with a wash in inactive saline. Tetrodotoxin (0.

Movement of labelled decamethonium in muscle fibres of the rat.

1. Tritium-labelled decamethonium accumulated in diaphragm muscles of the rat in vitro with a peak at the end-plate region and the distributions were fitted by Gaussian curves. 2.

Labelled decamethonium in cat muscle.

1 Tritium-labelled decamethonium was infused intravenously in 12 cats at final rates of 1.3-4.2 nmol kg-1 min-1 to produce a steady plasma concentration which ranged between 0.

Entry of decamethonium in rat muscle studied by autoradiography.

1. When a steady plasma level of decamethonium was maintained by infusion in rats, the labelled compound became concentrated in the region of the end-plate of skeletal muscle, as shown by scintillation counting.2.

Decamethonium in depolarized muscle and the effects of tubocurarine.

1. In rat diaphragms immersed in solution containing 5 mM potassium the maximum uptake of labelled decamethonium was found at the end-plate region. In muscles depolarized in solution containing potassium methyl sulphate the uptake was reduced but a peak concentration at the end-plate region was still demonstrated.