The ability of a species to adapt to stress factors such as exposure to toxicants depends to a large extent on the presence of individuals that are able to respond to the exposure in a successful way. Several strategies can be employed to cope with different stress factors. Investments on growth and reproduction, for instance, can be varied to meet the requirements of the environment. Large individuals generally have a high resistance against stress, but a large body size is often achieved at the cost of other characteristics. In the present study, the resistance of several clones of Daphnia to different stress factors, such as toxic cyanobacteria, a predator released chemical, and starvation, was investigated. The focus was on interactions among different factors and whether observed responses can be regarded as evolved adaptations for the different conditions.

Adaptation, Physiological↗

PubMedDate not supplied

Vector quantization as a method for integer EMG signal compression.

Vector quantization (VQ) is a well-known lossy compression method, which has not often been applied to biosignals. In this paper, VQ and its mean residual variant for encoding and decoding electromyography (EMG) signals have been tested. The methods are selected in such a way that they can be later applied in a low-resource embedded system. A neural network approach is used for codebook generation. The preservation of medical parameters is a prominent sign of quality in medical compression systems. Both signal level fidelity factors and preserving medical parameters are tested. The results show that mean residual vector quantization with short segments is a workable approach for EMG signal compression.

Algorithms↗

PubMedDate not supplied

Fibrinolytic treatment in acute myocardial infarction.

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Acute Disease↗