von Brand T, Weinbach E C
Z Parasitenkd. 1975 Dec 11;48(1):53-63. doi: 10.1007/BF00389829.
Larval Taenia taeniaeformis in vivo accumulates 45Ca2+ in soft tissues and calcareous corpuscles. Radioactivity was demonstrable in the corpuscles six months after a single dose of 45Ca2+ was administered to the host by means of a stomach tube. Ca2+ also was taken up by isolated larvae. Accumulation in vitro was more rapid then in vivo and was correlated with the external Ca2+ concentration. Temperature variation, oxygen availability, and metabolic inhibitors had little effect on the Ca2+ uptake, indicating that active transport of Ca2+ is unlikely in this parasite. Variations in the external Pi concentrations had no effect on Ca2+ accumulation or on its distribution. Addition of 5% CO2 increased the uptake of Ca2+ by the calcareous corpuscles under anaerobic conditions. Radioactivity from NaH14CO3 also was accumulated in soft tissues and corpuscles of T. taeniaeformis. Assuming that the 14C taken up by the corpuscles was in the form of 14CO3(2-), the ratio of Ca2+ to CO3(2-) accumulation in the corpuscles approximates the ratio of these constituents in dolomite: CaMg(CO3)2.
豆状带绦虫幼虫在宿主体内，会在软组织和石灰小体中积累45Ca2+。通过胃管给宿主单次注射45Ca2+六个月后，石灰小体中可检测到放射性。分离出的幼虫也会摄取Ca2+。体外积累比体内更快，且与外部Ca2+浓度相关。温度变化、氧气供应和代谢抑制剂对Ca2+摄取影响很小，表明该寄生虫不太可能存在Ca2+的主动转运。外部Pi浓度的变化对Ca2+积累及其分布没有影响。在厌氧条件下，添加5%的CO2会增加石灰小体对Ca2+的摄取。来自NaH14CO3的放射性也会在豆状带绦虫的软组织和石灰小体中积累。假设石灰小体摄取的14C是以14CO3(2-)的形式存在，石灰小体中Ca2+与CO3(2-)积累的比例接近白云石（CaMg(CO3)2）中这些成分的比例。
