Eleven old male patients with hyperuricemia were collected ( hyperuricemia group,65-90 years old ).10 healthy middle-aged males ( middle-aged group,30-40 years old) and 10 healthy old males ( older group 60-70 years old ) with normal blood uric acid level were used as controls.All of the subjects were given low purine content diet ( 250 mg/d ) for 3 days followed by high purine content diet ( 800 mg/d ) consecutively for another three days.The samples of fasting blood and 24 h urine were collected for assay.The results showed that there were no significant changes of serum uric acid ( UA ) concentration in three groups after low purine content diet.But the levels of serum UA in three groups all increased significantly after high purine content diet,and the change was higher in hyperuricemia group than middle-aged group [ ( 507.7 ± 108.1 vs 378.9 ± 80.1 ) μmol/L,P＜0.05 ].24 h urine uric acid excretion in three groups was all significantly decreased after low purine content diet and increased after high purine content diet.After high purine content diet,24 h urine uric acid was lower in hyperuricemia group than middle-aged group [ ( 2.99 ± 1.21 vs 3.62 ± 1.02 ) mmol/24 h,P＜0.05 ].Blood urea nitrogen levels in all subjects decreased after low purine content diet and increased after high purine content diet ( P＜0.05 or P＜0.01 ).Creatinine clearance rate in hyperuricemia group was decreased after high purine content diet compared with baseline [ (75.3 ± 20.3 vs 80.7 ±20.0) ml/min ],and there were no significant changes in other groups after low and high purine content diet.24 h urine protein in hyperuricemia group was higher than middle-aged group ( P＜0.05 ),and increased after high purine content diet with significant difference ( P＜0.05 ).These results suggest that high purine content diet and decreased by renal uric acid clearance mainly contribute to hyperuricemia in old people.

Objective Revealing the developmental regulation of Cervus nippon's oocyte and organelles. Methods In the experiment,follicle systems during both estrum and non- estrum were divided into the primordial follicle,growing follicle and mature follicle according to the Cervus nippon's follicle diameter size,formation of zonapellucida,appearance time of follicular cavity.At the same time,observations on cytoplasmic organelles in development of oocytes were conducted with electron microscopic,eyepiece micrometer and photomicrographic technique(The number of every oocyte observed is 6-8). Results In the primordial follicle and early growing follicle phase,the quantity of mitochondria,golgi apparatus,smooth endoplasmic reticulum and cortical granules increased gradually and all organelles moved to the cortical area.However,in the late growing follicle and mature follicle phase,Golgi apparatus and rough endoplasmic reticulum disappeared,cortical granules began to arrange themselves in line beneath the plasma membrane of the oocyte,mitochondrias dispersed toward the central region of cytoplasm,and almost all the round mitochondria with rare cristae turned into hooded ones, and nucleus compaction occurred.In addition,the short and thick microvilli began to appear from the primary follicle ovocyte,become intensive and slender when secondary follicle's ovocyte;It's until tertiary follicle's ovocyte,microvilli started to shorten and become coarse,and even parts of them contract from the zona pellucida gradually.Conclusion In the development of oocytes, the changes of type,quantity and distribution on mitochondria has a close relation with cells at proliferation,differentiation and metabolism level.Cortical granule has no association with golgi apparatus basically,but smooth endoplasmic reticulum(SER).The nuclei are the sites of RNA synthesis and warehouses,and its densification is the premise of meiosis recovery.