麦冬类中药组织切片计算机三维重建图鉴

利用计算机技术实现麦冬类中药组织连续切片三维重建与动态显示,为计算机辅助生药学鉴定和教学提供了新的三维图像技术和研究资料。     

用混合粘合剂碳糊电极测定丁螺环酮

用混合粘合剂碳糊电极测定丁螺环酮张正奇，曾鸽鸣，刘传桂，黎艳飞（湖南大学化学化工系，长沙４１００８２）碳糊电极无毒，制作方便，表面更新容易，应用电位范围广，在药物分析中已有应用［１～５］。我们在液体石腊中加入添加剂，组成混合粘合剂，可显著改善电极的检...     

In situ saphenous vein bypass grafts: angiographic evaluation and interventional repair of complications

In situ saphenous vein grafts are being used with increasing frequency for bypass procedures involving the femoral and popliteal arteries. Complications of these procedures include anastomotic stenoses and persistent arteriovenous fistulae that may result in failure of the graft. Balloon angioplasty and embolotherapy with detachable balloons were employed successfully in three or four recent cases of patients with complications from in situ grafts. Tailored angiography is essential for evaluating in situ grafts, and interventional techniques are extremely useful for managing complications.     

Polyamines modulate the binding of GABAA-benzodiazepine receptor ligands in membranes from the rat forebrain.

The effects of spermine, spermidine and putrescine on the binding of the GABAA-benzodiazepine receptor complex were examined in the hippocampus and frontal cortex membranes of the rat. The results demonstrated modulatory effects of polyamines on the binding of diazepam and flunitrazepam but not on that of GABA, muscimol and Ro 15-1788. When membranes were prepared without detergent, the polyamines enhanced the binding of diazepam. However, while the binding capacity increased after homogenization in the presence of the non-ionic detergent Triton X-100, the polyamines did not enhance the binding but inhibited the binding of diazepam and flunitrazepam at greater concentrations. Considered together with other studies, the present findings indicate that polyamines can modulate the binding characteristics of several different neurotransmitter receptor-ionophore complexes.     

Assessment of 5α-reductase activity in hirsute women: comparison of serum androstanediol glucuronide with urinary androsterone and aetiocholanolone excretion

OBJECTIVE Recent evidence suggests that androstanediol glucuronide (AG), a metabolite of dihydrotestosterone (DHT) formed in skin, is frequently elevated in hirsute women, presumably reflecting enhanced 5a-reductase activity. An alternative method of demonstrating 5a-reductase activity is the androsterone (A)/aetiocholano-lone (E) ratio in urine. A and E are the 5α- and 5β- reduced metabolites, respectively, of androstenedione, which is the principal metabolite of dehydroepiandrosterone (D). Although serum AG and the urinary A/E ratio have both been considered valid methods for assessing 5α-reductase activity, the two have not been previously compared in hirsute women. The present study was undertaken to assess 5a-reductase activity in hirsute patients as determined by these two different methods. PATIENTS AND MEASUREMENTS We surveyed 47 untreated women (ages 17–33) with various degrees of hirsutism. Serum testosterone, bioavailable testosterone, dehydroepiandrosterone sulphate, and AG were determined. Additionally, A, E and D were measured in 24-hour collections of urine. RESULTS For the 47 women, 37 had elevated blood levels of AG (17.4 ± 2.2, mean±SEM; normal <8 nmol/l), but only 18 of these had an increased urinary A/E ratio (> 1.5). All but one of the remainder had elevated urinary and/or serum androgen levels. Overall, no significant correlation between AG and A/E was observed. There was a highly significant correlation between AG in serum and A in urine (r= 0.82, P<0 001). AG was also positively related to dehydroepiandrosterone sulphate (r= 0.64; P< 0.005), bioavailable testosterone (r= 0.6; P<0001), aetiocholanolone (r= 0.58; P<0 001) and total testosterone (r= 0.52; P& 0.01). In contrast, A/E was not significantly related to androgen production. CONCLUSIONS There is a poor correlation between AG and the A/E ratio in hirsute women. Although AG may be raised by increased 5α-reductase activity, it is probably also affected by the presence of elevated androgens regardless of 5α-reductase activity.     

Association between pancreatic cystadenocarcinoma, malignant liver cysts, and polycystic disease of the kidney

Polycystic kidney disease is an autosomal dominant disease that may be associated with cystic disease of the liver. In women, the cysts may develop early and be more troublesome than in men. Cystadenocarcinoma of the pancreas is uncommon, comprising 1% of primary pancreatic malignancies. This case report is the first to describe a familial association between polycystic kidney disease and cystadenocarcinoma of the pancreas and liver in the English medical literature. A patient with autosomal dominant polycystic kidney disease (ADPKD) and multiple hepatic cysts developed cystadenocarcinoma of the pancreas with multiple malignant liver cysts. The patient's mother, sister, and niece had ADPKD, and the patient's sister also died of pancreatic cystadenocarcinoma. We believe that the development of these two disease entities in which the primary pathology is cyst formation has a genetic association. (Gastroenterology 1997 Jun;112(6):2104-7)     

Pheochromocytoma and paraganglioma: comparison of MR imaging with CT and I-131 MIBG scintigraphy

To ascertain the magnetic resonance (MR) imaging characteristics of pheochromocytomas and paragangliomas and to compare MR with computed tomography (CT) and iodine-131 metaiodobenzylguanidine (I-131 MIBG), 19 patients (18 with pheochromocytomas, one with a paraganglioma) were studied. The 18 patients with pheochromocytomas had had positive findings with I-131 MIBG scintigraphy. Abdominal pheochromocytomas were generally hypointense compared with normal liver on T1-weighted MR images and extremely hyperintense on T2-weighted MR images. MR imaging was preferable to CT in the evaluation of primary pheochromocytomas due to superior tissue characterization, particularly in the patient with hypertension and borderline catecholamine levels. For patients with recurrent or metastatic disease, the data suggest that I-131 MIBG scintigraphy is the examination of choice.     

Spontaneous ovarian hyperstimulation mimicking an ovarian tumour

Ovarian hyperstimulation syndrome in a spontaneous singletonpregnancy is exceedingly rare. We report a case of ovarian hyperstimulationpresenting as bilateral ovarian masses in association with spontaneouspregnancy, occurring in a woman with disturbed liver function.A possible mechanism is discussed.