The infrastructure of in vitro cultured exoerythrocytic stage (EE) of Plasmodium ber-ghei (P.b.)was observed under transmission electron microscope (TEM).The drug sensitivity of EE was also measured in vitro.The EE was cultured in monolayer host cell,fixed and embeded in situ.The ultrathin sections were prepared and examined by routine methods.The TEM pictures showed that the fine structure of in vitro cultured EE was similar with that of EE grown in rat hepatocytes in vivo,as described by Meis et al.The parasite was found within a parasitophorous vacuole,with nucleus,mitochondria,endoplasmic reticuia and Golgi apparatus were observed inside the parasite.After 24h cultivation,the EE was incubated for 48h in medium containing a serial concentrations of primaquine or chlo-roquine,then examined under light microscope.The percentage of abnormal parasites was calculated.The preliminary results showed that the sensitivity of cultured P.b.EE to primaquine and chloroquine was significantly different.At the same concentration of 1?10-5 mol/L,the percentage of abnormal parasites was 38.5?3.9% and 5.7?1.9% ,respectively These results demonstrated that the in vitro cultivation system of P.b.EE would have potential utility in antimalarial drug research.(Figs.1-6)

Background Vitreous amyloidosis is an autosomal dominant hereditary disease,often leads to reduction of visual acuity and affects life quality of patients.Vitrectomy is the main treatment for vitreous amyloidosis,but the analysis of curative efficacy in China is rarely reported.Objective The study was to observe and analyze the efficacy of vitrectomy for vitreous amyloidosis.Methods The clinical data of 11 eyes from 6 patients with vitreous amyloidosis who received vitrectomy from March 2011 to February 2013 in Affiliated Hospital of Guizhou Medical University.The best corrected visual acuity (BCVA),intraocular pressure (IOP),manifestations under the slit lamp microscope,findings of ocular fundus and results of fundus fluorescence angiography (FFA) were observed after surgery.Pathological examination for vitreous samples was carried by Congo red staining.Results Before surgery,the visual acuity was counting fingers for 30 cm in 5 eyes and hand movement for 30 cm in 6 eyes,and the mean IOP was (13.09±2.12)mmHg (1 mmHg=0.133 kPa).Fixed white flocks in vitreous and white membrane on the posterior lens capsule were seen under the slit lamp microscope.The BCVA remained 1.0 in 7 eyes and 0.8 in 4 eyes 1 week,6 months and 2 years after vitrectomy,and the mean IOP was (13.32±2.07),(14.09±2.47),(12.32±1.87)mmHg at 1 week,6 months and 2 years after vitrectomy,respectively.FFA showed a little fluorescein leakage at peripheral retinal vessel in all eyes at 1 week after vitrectomy but the leakage disappeared at 6 months after vitrectomy.The white flocks increased at peripheral retina in 4 eyes at 2 years after vitrectomy,but the BCVA remained the same in the eyes.Pathological examination of vitreous specimens comfirmed the diagnosis of vitreous amyloidosis.Conclusions Vitrectomy is an effective method for the treatment of vitreous amyloidosis,which can effectively improve the visual acuity of patients.Postoperative recurrence of vitreous amyloidosis appear in parts of patients,but the BCVA is unaffected.