Study of multi-factor cognition evoked by binocular disparity / 生物医学工程学杂志

It is the aim of studies in cognitive process to understand how the impressive cognitive capacity of the human mind is uninterruptedly developed and how the process is controlled. We have been focusing attention on the central question with stereoscopic research. A multi-channel EEG data acquisition system is constructed for cognition studies which not only works perfectly in the EEG collection and signal processing of stereoscopic visual evoked potentials(VEP) but also is suitable for investigative and clinical use. We have identified the fact that the processing of stereoscopic depth information is done in the cortical advance functional areas with labeled characteristic signaling of the depth related VEP and the results were shown to be of no difference when compared with the ones of other investigations. We believe, the stereoscopic depth cognition is both a dynamic multi-factor processing process and a consequence of depth perception in advanced cortical areas through biological feedback to the whole process of visual signal processing. It is our novel and significant supposition in the psychophysical study, and the experimental results of the VEP are presented in this article.

Changes of subcellular calcium in hypo-themal-preserved cat kidney cortex cells detected by X-ray microanalysis of microsections / 生物医学工程学杂志

It was pointed out by many researches that keeping the concentration of Ca2+ in cells could increase the survival rate of hypothermic preserved kidneys and the survival rate of transplants. In this study, changes of the concentration of calcium were detected within catoplasm, mitochondria, endoplasmic reticulum and nucleus in the isolated hypothermic storage cat kidney, Ca2+ be marked with calcium cytochemical probe (K2H2Sb2O7) and detected by X-ray microanalysis of microsections. After 24, 48 and 72 hours preservation, the p/b (peak/back) of calcium within cytoplasm and mitochondria increased significantly. There were no obvious changes within endoplasmic reticulum and nucleus. It demonstrates that the Ca2+ were released from calcium pool (except the endoplasmic reticulum, nucleus, mitochondria etc.) to cytoplasm during preservation; and mitochondria can uptake calcium from cytoplasm to some extent, while the calcium concentration of cytoplasm is higher than normal.