Ionochromic behavior of Grecko visual pigments.
Ionochromic behavior of Grecko visual pigments.
复制标题
Grecko 视觉颜料的离子变色行为。
作者：
F. Crescitelli
为了最大限度地减少氯离子的存在，壁虎视网膜的洋地黄素提取物显示，光致色素的位置约为490纳米，而不是521纳米，这是在原位发现的相同色素的位置。在萃取物中加入氯化物会引起光谱吸光度的红移，在一定范围内，漂移的幅度与氯化物的浓度有关。这种影响是特定的，在所有被测试的阴离子中，只有溴化物会引起类似的红移。不涉及阳离子的性质，因为钠、锂、钾、锶、铯、钙、镁、铍、镧和胆碱的氯化物也产生相同的作用。
Digitonin extracts of the retina of Gekko gekko prepared to minimize the presence of chloride ions show the photopigment to be at about 490 nanometers rather than at 521 nanometers, the position found for the same pigment in situ. The addition of chloride to the extract causes a bathochromic shift in spectral absorbance, the magnitude of the shift being related to the concentration of chloride, within limits. The effect is a specific one, and of all the anions tested only bromide causes a similar bathochromic shift. The nature of the cation is not involved since the same action is produced by the chlorides of sodium, lithium, potassium, rubidium, cesium, calcium, magnesium, beryllium, lanthanum, and choline.