反相高效液相色谱法测定丹参中丹参酮工和丹参酮ⅡA的含量

[目的]用反相高效液相色谱法(RP-HPLC)同时测定丹参药材中丹参酮Ⅰ和丹参酮ⅡA的含量．[方法]选用mightysil RP-18(H)GP250-4．6(5μm)．流动相为甲醇-水(75：25)，检测波长为270nm，流速为1mL／min，温度为35℃．[结果]丹参酮Ⅰ和丹参酮ⅡA含量分别在0．0952～0．9520μg和0．1222～0．2850μg内呈线性关系；丹参酮Ⅰ和丹参酮ⅡA的平均回收率分另4为99．90％和99．69％．[结论]此方法快速、简便、可靠，为丹参及其制剂质量控制的科学方法。     

大鼠脑内儿茶酚胺类递质及其代谢物的同时提取及反向高效液相测定法

目的建立一种操作简便、高效的测定脑组织中去甲肾上腺素(NA)、肾上腺素(AD)、多巴胺(DA)、3,4二羟基苯乙酸(DOPAC)及高香草酸(HVA)的方法,为有关药物作用机理的研究提供实验手段.方法以有机溶剂提取,高效液相色谱--电化学检测器(HPLC-EC)测定大鼠纹状体、皮质、下丘脑NA、AD、DA、DOPAC及HVA的含量.结果测得NA、AD、DA、DOPAC及HVA的绝对回收率依次分别为:80.3%±12.4%,86.5%±14.3%,90.3%±12.1%,89.5%±17.2%、87.6%±[13].2%.线性范围0.2～20ng,批内与批间变异系数分别小于8%及10%.结论该方法具有简便、迅速、回收率较高的特点,便于实验室应用.     

福建产舟山眼镜蛇毒细胞毒素的快速分离纯化及鉴定

目的 从舟山眼镜蛇毒中分离纯化细胞毒素(CTX)，并鉴定其理化性质。方法 采用SP—Sephadex C-25阳离子交换色谱及Sephasil Peptide C18反相高效液相色谱法从舟山眼镜蛇毒中分离纯化CTX，SDS—PAGE(Tris—Tricine系统)鉴定纯度，Edman降解法测定N端氨基酸序列。结果 粗毒经阳离子交换色谱，得到14个蛋白峰，其中第X～XⅢ峰具CTX活性；再分别经反相色谱纯化，得到4个CTX．总得率为32.48％；SDS—PAGE显示为均一蛋白，分子量依次为：7．28，7．33，7．24和7．38kD；测定它们N端20个氨基酸序列。结论 采用阳离子交换和反相高效液相色谱可快速、高效地从眼镜蛇毒中获得4个CTX纯品。     

Electrodynamics and ultimate SNR in parallel MR imaging.

The purpose of this article is to elucidate inherent limitations to the performance of parallel MRI. The study focuses on the ultimate signal-to-noise ratio (SNR), which refers to the maximum SNR permitted by the electrodynamics of the signal detection process. Using a spherical model object, it is shown that the behavior of the ultimate SNR imposes distinct limits on the acceleration rate in parallel imaging. For low and moderate acceleration, the ultimate SNR performance is nearly optimal, with geometry factors close to 1. However, for high reduction factors beyond a critical value, the ultimate performance deteriorates rapidly, corresponding to exponential growth of the geometry factor. The transition from optimal to deteriorating performance depends on the electrodynamic characteristics of the detected RF fields. In the near-field regime, i.e., for low B0 and small object size, the critical reduction factor is constant and approximately equal to four for 1D acceleration in the sphere. In the far-field wave regime the critical reduction factor is larger and increases both with B0 and object size. Therefore, it is concluded that parallel techniques hold particular promise for human MR imaging at very high field.     

高原康胶囊对大批快速进入高原者血浆醛固酮、血管紧张素II及水负荷的影响及意义

目的 :了解高原康胶囊对快速进入高原者血浆醛固酮 (Aldosterone ,ALD)、血管紧张素II(AngiotensinII ,AII)及水负荷的影响及意义。方法 :将 80名由平原快速进入高原的新兵随机分为实验组 4 0名 ,对照组 4 0名 ,实验组于平原登机前开始给予口服高原康胶囊 ,连服 3日 ,对照组给予安慰剂 ,两组均于进入高原的前 1天及进入高原的第 3天午给予水负荷实验 ,并对饮水前血浆ALD、AII及饮水后 15 0min内各时间段的尿量及两组进入高原后 7天内急性高原病 (Acutehighal titudediseaes ,AHAD)的发病率进行对照比较。结果 :对照组进入高原后与平原相比血浆ALD、AII显著升高 ,水负荷实验 6 1min～ 15 0min各时间段的尿量及相应时间的总尿量与平原时相应各时间段的尿量及相应时间的总尿量相比则显著减少 (P <0 0 5～ 0 0 0 1) ,而实验组则无显著变化 (P >0 0 5 ) ;进入高原后实验组与对照组相比水负荷实验 6 1min～ 90min的尿量及 12 0min、15 0min的尿总量则显著多于对照组 (P <0 0 5 ) ;血浆ALD、AII及AHAD发病率则显著低于对照组 (P <0 0 5～ 0 0 0 1)。结论 :高原康胶囊能显著降低快速进入高原者的血浆ALD、AII ,通过对水负荷调节的影响减少机体的钠水潴留 ,从而防止快速进入高原者AHAD的发生 ,可用于大批快     

Growth, bone maturation and pubertal development in children with the EMG-syndrome

In 7 patients (5 girls, 2 boys) with the EMG or Wiedemann-Beckwith syndrome, statural growth, bone age (BA), weight and pubertal development were studied longitudinally. Height was above the 90th percentile (%) for chronological age (CA) after age 2 years, reaching an average of 2.5 SD above the mean at or after puberty. Adult or attained height also exceeded significantly (P<0.015) parental (genetic) target height by 13.2 cm on the average. In one girl, adult height prognosis (190 cm) could be reduced to an adult height of 183 cm by high-dose estrogen treatment. In most children, growth velocity remained above the 90th % up to 4–6 years of age and normalized thereafter. In all patients studied, bone age was markedly advanced and particularly so during the first 4 years after birth. Weight was above the 90th–97th % during infancy and early childhood and remained there, appropriate or slightly subnormal for height, until adulthood, except for 3 girls who reached and maintained the 50th % during or after puberty. Spontaneous pubertal development occurred within normal limits for CA and around the 50th % for BA. Except for the marked bone age acceleration, the reason for the increased statural growth and adult height in patients with the EMG syndrome is still unknown.     

肝病治疗仪治疗高原慢性乙型肝炎患者的临床观察

目的观察WGLY-801型电脑肝病治疗仪对慢性乙型肝炎的治疗效果。方法随机选取慢性乙型肝炎患者144例,分为治疗组66例,在常规治疗基础上加用肝病治疗仪;对照组78例,采用常规治疗,观察两组治疗效果。治疗三疗程共45天(每疗程15天),观察临床症状、肝功能的动态变化,并对最终效果进行评价。结果经治疗后,两组患者临床症状、肝功能较前均有好转,但治疗组起效快,疗程明显缩短,疗效好,差异有明显统计学意义(p<0.05)。结论肝病治疗仪,操作简单,疗效确切,值得进一步推广应用。     

腹腔镜胆囊切除术中超声刀直接处理胆囊动脉(附800例报告)

目的探讨超声刀直接处理胆囊动脉的临床价值. 方法回顾分析1999年7月至2002年12月采用超声刀直接凝固切断胆囊动脉的腹腔镜胆囊切除术800例临床资料. 结果所有病例均顺利完成手术,无一例术中或术后胆囊动脉残端出血;病理切片镜下见超声刀的热作用足以使胆囊动脉壁组织发生变性,管腔闭塞. 结论腹腔镜胆囊切除术中超声刀直接处理胆囊动脉安全可靠.