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Objective To investigate the efficacy of photodynamic therapy(PDT) for tumor diagnosis.Methods A total of 1 400 patients with the cervix of uterus disease,56 patients with gullet disease,133 patients with stomach diseases,37 patients with urinary bladder tumor and 14 patients with brain tumor underwent diagnosis with PDT,combination of He-cd laser,Ar+ laser,and KTP laser.Results All of the patients could be explicitly diagnosed by this method,which indicated that PDT helped greatly in early tumor diagnosis. Conclusion PDT can be an effective diagnostic method for tumors of early stage,and should be widely applied clinically.
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Mandelic acid(MA). the hydrolysate of a compound extracted from the leaves of prunus Persica B, possesses a strong spermicidal effect in vitro. In this experiment. the International Planned Parenthood Federation screening method for spermicides was used. Dilutions of MA, between 0.8mg/ml and 3.3mg/ml, totally immobilized human spermatozoa in less than 1 min. When the lowest spermicidal concentrotions of MA and boric acid against human spermatozoa were compared, it was found that MA was 40 times more potent than boric acid.
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The changes of zine content in serum and feces observed after intragastric administration of a certain dose of dithizone to the pregnant rats in their third trimester for one week, and the developing status of brain of their pups were studied. The result showed that the total fecal exerction of zine during 24 hours increased and serum zine content decreased significantly aftcr continual administration of dithizone for one week in maternal rats. It suggested that dithizone may be used for making animal model of zine deficiency. The body and brain weights, brain protein content and RNA/DNA ratio of the newborn delivered by the zine-deficiency maternal rats decrcased significantly. This indicates that the maternal zine dificiency in third trimester gives side effects on the development of their fctal brain.
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This experiment has proved that bolbostemmosaponin and its constituents A and D have relatively powerful spermatocidal effects. They can kill all spermatozoa in a moment at the concentrations of 0.04%, 0.04% and 0.03% respectively. These spermatocidal agents mainly distroy the biomembrane system of sperm. Using the fixed gelatin membrane technique proved that all of them can strongly inhibit tne activity of a single sperm acrosin at the concentration of 0.05%.
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In ultrastructural level, this paper shows that the pig bile extracts and its effective constituent, the sodium deoxycholate, could fragment the Trichomonas vaginalis in vitro, The flagellum and caudal projection were splitted up; the plasma membrane, the intracellular membrane system, such as the limiting membranes of hydrogcnosome, phagosome and nuclear envelope were injured too; and cytoplasm was condensed, even the whole body was fragmented. The mechanism of the effeces is probably due to the fact that the surface activity of the drugs accelerated degradation of lipids which are made of the biomembrane system of human trichomonas vaginalis.
