L－赖氨酸高产菌株筛选

本实验以Ｌ－赖氨酸产生菌钝齿棒杆菌（Ｃｏｒｙｎｅｂａｃｔｅｒｉｕｍｃｒｅｎａｔｕｍ）ＯＭ－４（ＨＳ＋，ＡＥＳｒ，Ｍｅｔｒ）为出发菌株，经硫酸二乙酯和氯化锂复合诱变处理，用ＡＥＣ（Ｓ－［２－氨乙基）－Ｌ－半胱氨酸）和苏氨酸定向筛选获得了高抗ＡＥＣ的突变株ＡＴ－５（ＨＳ＋，ＡＥＣｒ，Ｍｅｔｒ）菌株，再以ＡＴ－５为出发菌株经亚硝基胍诱变处理，获得一株产Ｌ－赖氨酸的ＴＡ（２－噻唑－ＤＬ－丙氨酸）抗性突变株（ＡＴＴ一６８号），菌株产酸量由原来ＯＭ一４菌株的４６．３ｍｇ／ｍＬ提高到７４．８ｍｇ／ｍＬ提高１６１．５％，在筛选结构类似物抗性突变株时采用小钢杯法，可大大节省结构类似物药品．     

肌苷高产菌株的选育

以肌苷产生菌枯草芽孢杆菌ＭＢＳ－１２为出发菌株，经紫外线诱变处理获得一株具有腺嘌呤、组氨酸、苯丙氨酸、硫胺素四重营养缺陷型并对８－氮杂鸟嘌呤、６－巯基嘌呤有双重抗性的突变株ＬＳＢＳ－１２５５（ａｄｅ￣－，ｈｉｓ￣－，ｐｈｅ￣－，ｔｈｉ￣－，８－ＡＧｒ，６－ＭＰｒ），在摇瓶试验中该变异株的产量显著高于亲株，摇瓶试验产肌苷达２７．４３ｍｇ／ｍｌ，最高可达２９．１０ｍｇ／ｍｌ，发酵周期为７２ｈ菌株性状稳定。     

不平衡支链氨基酸对胃癌细胞体外增殖和化疗敏感性的影响

在不含缬氨酸（Ｌ－Ｖａｌ）的ＭＥＭ培养基基础上，以普通ＭＥＭ培养基Ｌ－Ｖａｌ（４６ｍｇ／Ｌ）和亮氨酸（Ｌ－Ｌｅｕ）含量（５２ｍｇ／Ｌ）为准，配制１２种限制Ｌ－Ｖａｌ，增加Ｌ－Ｌｅｕ的不平衡支链氨基酸培养基，用ＭＴＴ法观察其对胃癌细胞株ＳＧＣ－７９０１体外增殖的影响和对该细胞株化疗药物敏感性的影响。结果表明，限制Ｌ－Ｖａｌ至正常的１／４对ＳＧＣ－７９０１细胞即有明显的抑制作用（Ｐ〈０．０１），随着Ｖ     

12种抗菌药物体外抗表皮葡萄球菌的活性研究

用微量肉汤稀释法测定从慢性前列腺炎患者标本中分离的４９株表皮葡萄球菌的抗菌活性及β－内酰胺酶。结果显示：美满霉素、白霉素有较强的抗菌作用，ＭＩＣ５０分别为０．２５ｍｇ／Ｌ、１ｍｇ／Ｌ，ＭＩＣ９０分别为２ｍｇ／Ｌ、８ｍｇ／Ｌ。环丙沙星、氧氟沙星抗菌作用次之，ＭＩＣ５０分别为０．５ｍｇ／Ｌ、１ｍｇ／Ｌ，ＭＩＣ９０均为３２ｍｇ／Ｌ。氨苄青霉素、林可霉素、淋必治抗菌作用较弱，ＭＩＣ５０分别为４ｍｇ／Ｌ、８ｍｇ／Ｌ、１６ｍｇ／Ｌ，ＭＩＣ９０分别为３２ｍｇ／Ｌ、６４ｍｇ／Ｌ、３２ｍｇ／Ｌ。表皮葡萄球菌对交沙霉素、阿奇红霉素、头孢拉定、罗红霉素及菌必治有较高抵抗作用，耐药率分别达４２．８６％、５９．１８％、６３．２７％、６７．３５％及７５．５１％。４９株表皮葡萄球菌β－内酰胺酶阳性率为８１．６３％。研究表明表皮葡萄球菌的多重耐药性较多见，临床医师应根据药敏结果，选用有效的抗生素以控制表皮葡萄球菌的机会感染，防止耐药菌株产生     

人型支原体药物敏感性与耐药性基因检测研究

目的了解人型支原体（Ｍｈ）耐四环素株耐药性状，指导临床用药。方法对临床感染标本中分离的５１株Ｍｈ分别进行了药物敏感试验和ｔｅｔＭ基因检测。结果５１株Ｍｈ有３１株（６０．７８％）带有ｔｅｔＭ基因，其中２５株（四环素ＭＩＣ≥３１２ｍｇ／Ｌ）对美满霉素－／ＸＧ１６．４５ｍｇ／Ｌ）、环丙沙星（－／ＸＧ８ｍｇ／Ｌ）强力霉素（－／ＸＧ５．５８ｍｇ／Ｌ）和氧氟沙星（－／ＸＧ４．３５ｍｇ／Ｌ）交叉耐药。５１株Ｍｈ     

维生素C生物转化的现状和进展

肌苷产生菌ＩＬ－１１１突变株的选育及发酵罐小试研究刘长云，李玉祥，辛东阳．药物生物技术，１９９５，２（１）：３３～３６以枯草芽孢杆菌ＬＳＢＳ－１２４７为出发菌株，经亚硝基胍和紫外诱变处理，获得一株高产突变菌ＬＬ－ｌｌｌ，摇瓶发酵产量为２８ｍｇ／ｍｌ，...     

微量元素对超氧化物歧化酶活性的影响

用ＮＢＴ－Ｐ法、火焰原子吸收法，测定了不同浓度Ｓｅ、Ｍｇ、Ｆ－条件下ＳＯＤ标准品的活性和反应体积中Ｓｅ、Ｍｇ、Ｆ－含量。结果显示：（１）Ｓｅ浓度为７．５μｇ／Ｌ，ＳＯＤ活性达５９．００ｍｇ／Ｌ；Ｓｅ浓度由０．００μｇ／Ｌ增加至７．５μｇ／Ｌ时，ＳＯＤ活性由４２．５ｍｇ／Ｌ升至５９．００ｍｇ／Ｌ；Ｓｅ浓度继续增加到１０．００μｇ／Ｌ、２０．００μｇ／Ｌ时，ＳＯＤ活性均降为４２．５ｍｇ／Ｌ。（２）Ｍｇ浓度为３０．００ｍｇ／Ｌ时，ＳＯＤ活性由９６．５ｍｇ／Ｌ，Ｍｇ浓度由０．００ｍｇ／Ｌ增至３０．００ｍｇ／Ｌ，ＳＯＤ活性达４２．５ｍｇ／Ｌ，升至９６．５ｍｇ／Ｌ；继续增加Ｍｇ浓度到５０．００ｍｇ／Ｌ，ＳＯＤ活性降为７５．５ｍｇ／Ｌ。（３）Ｆ－由０．００ｍｇ／Ｌ增加到５．００ｍｇ／Ｌ时，ＳＯＤ活性由４２．５ｍｇ／Ｌ升到４９．５ｍｇ／Ｌ；继续增加Ｆ浓度到１０．００ｍｇ／Ｌ，ＳＯＤ活性降为４４．５ｍｇ／Ｌ；再增加Ｆ浓度至２０．００ｍｇ／Ｌ、４５．００ｍｇ／Ｌ后，ＳＯＤ活性维持在４９．５～５１．０ｍｇ／Ｌ之间。提示：ＳＯＤ活性受微量元素Ｓｅ、Ｍｇ、Ｆ－浓度的影响较大，只有在最适微量元素浓度条件下，ＳＯＤ活性方可达最高。     

虎杖中蒽醌化合物部分分离晶体抗Ⅰ型人疱疹病毒的实验研究

对虎杖中蒽醌化合物进行了分级分离，并且对乙酸乙酯卒取部分晶Ⅲ、晶Ⅳ抗ＨＳＶ－１药效，通过病毒所致细胞病变的抑制以及空斑减数实验进行了观察。结果表明，在ＨＥＰ－２细胞系统中，晶Ⅳ对ＨＳＶ－１Ｆ株的增殖及其感染均具有明显的抑制作用，ＥＤ５０分别为０．０６７ｍｇ／Ｌ及０．０３０７２ｍｇ／Ｌ，ＥＤ９０分别为３．３９８ｍｇ／Ｌ及１．８１１ｍｇ／Ｌ。同样，晶Ⅳ对ＨＳＶ－１Ｆ株也具有显著的直接杀灭作用，ＥＤ５０及ＥＤ９０分别为０．０９４４３ｍｇ／Ｌ及３．５０１ｍｇ／Ｌ。认为晶Ⅳ对ＨＳＶ－１具有显著的抑制作用，而其细胞毒作用不强，值得开发利用。     

虎杖中蒽醌化合物部分分离晶体抗I型人疱疹病毒的实验研究

对虎仗中蒽醌化合物进行了分级分离，并且对乙酸乙酯萃取部分晶Ⅲ，晶Ⅳ抗ＨＳＶ－１药效，通过病毒所致细胞病变的抑制以及空斑减数实验进行了观察，结果表明，在ＨＥＰ－２细胞系统中，晶Ⅳ对ＨＳＶ－１Ｆ株的增殖及其感染均具有明显的抑制作用，ＥＤ５０分别为０．０６７ｍｇ／Ｌ及０．０３０７２ｍｇ／Ｌ，ＥＤ９０分别为３．３９８ｍｇ／Ｌ及１．８１１ｍｇ／Ｌ，同样，晶Ⅳ对ＨＳＶ－１Ｆ株也具有显著的直接杀灭作用，ＥＤ５０     

406株淋病奈瑟氏菌对青霉素G敏感度的测定

对青岛地区流行的４０６株淋病奈瑟氏菌进行青霉素最小抑菌浓度的测定（ＭＩＣ）。结果，对青霉素Ｇ高度敏感者（ＭＩＣ＜０．０６ｍｇ／Ｌ）９９株，占２４．５％；中度敏感（ＭＩＣ在０．１２５～０．５ｍｇ／Ｌ）２３８株，占５８．５％；总敏感率为８３．０％。耐药（ＭＩＣ≥１ｍｇ／Ｌ）者６９株，占１７．０％；在耐药菌株中有２３株ＭＩＣ≥１６ｍｇ／Ｌ，且这２３株耐药菌的β－内酰胺酶试验均为阳性。表明耐青霉素株在青岛地区流行的淋病奈瑟氏菌中占有较大比例，应予以重视。     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.