固定无花果蛋白酶制备可溶性肽的研究

将 Sephadex G-200与β-硫酸酯乙砜基苯胺(SESA)首先醚化制备对氨基苯砜乙基交联葡聚糖(ABSE-Sephadex G-200),然后经重氮化固定无花果蛋白酶。固定化酶的活力回收达69%。苯甲酰-DL-精氨酰-β-蓁胺(BANA)对该酶固定化过程中的活性变化有保护作用。天然酶与固定化酶都具有良好的耐热性,在59～60℃,80min,活性均无明显下降;在69～70℃,80min 固定化酶较天然酶更稳定。用 BANA 为底物,在半胱氨酸存在下,测定了两种形式酶的动力学性质。在 pH7.7的磷酸盐缓冲系统中,37℃天然无花果蛋白酶的 Km=0.32m-mol/L;在间歇振摇下固定化酶的表观 Km′=1.02mmol/L。最适 pH 无明显改变,均为7.7。     

以甲壳胺为载体固定乙酰胆碱酯酶

目的 探讨以甲壳胺为载体固定乙酰胆碱酯酶的最佳条件及固定化酶的理化性质.方法 以戊二醛为交联剂,将乙酰胆碱酯酶固定在甲壳胺上,并分别测定固定化酶与溶液酶的活力.结果 固定化酶与溶液酶的最适温度相同,均为37℃;固定化酶与溶液酶最适pH分别为8.2、8.0;固定化酶在50℃仍有较高热稳定性,而溶液酶活力明显下降;固定化酶的米氏常数Km=0.84 mmol/L,溶液酶的Km=1.16 mmol/L;固定化酶活力回收为44.66%,在重复使用8次后仍能保持原有活力的50%.结论 该固定化酶与溶液酶相比,其热稳定性提高,与底物的亲和能力增大,且重复使用性较好.     

源于纤维单胞菌的聚阿拉伯糖内切酶性质的研究

目的确定源于纤维单胞菌（Cellulomonose sp．）的聚阿拉伯糖内切酶的性质。方法SDS—PAGE和凝胶层析测定相对分子质量,离子交换层析估计等电点,TLC法测定酶活力,Lineweare—Burk双倒数做图法测定酶促反应动力学特性。结果相对分子质量为45kD,等电点约为6．0,酶促反应动力学符合Michaelis—Menten动力学规律,在37℃反应条件下,米氏常数Km为2．5mg／ml,最大反应速率Vmax为0．083μmol／L·min,最适pH为8．0,pH6．0～9．0时较稳定。最适温度为40℃,在40℃以下较稳定,超过50℃时酶活力开始下降。结论确定了一种聚阿拉伯糖内切酶的性质。     

固定化脂肪酶的动力学研究

以壳聚糖为载体，用物理吸附固定化脂肪酶，对影响固定化过程的各种因素进行了考察，确定了最优条件，并比较了游离酶和固定化酶的最适温度、pH、酶的热稳定性以及表观Km。固定化酶水解的最适pH(pH7．0)稍低于游离酶(pH8．0)，最适温度为50℃(游离酶为40℃)。固定化酶在50℃的半衰期(0．96h)是游离酶(0．32h)的3倍，在4℃的冰箱中贮存3个月活力变化很小。     

蒜酶催化蒜氨酸动力学研究

目的:研究酶促反应的动力学参数,为新药设计提供依据。方法:采用HPLC方法测定酶促反应的动力学参数及蒜酶的最适pH和最适温度。结果:蒜酶以蒜氮酸为底物,最大反应速度Vmax=27.9 μnml·min-1·mg-1,米氏常数Km=3.6 mmol/L,其最适pH为6.6,最适温度为35℃。结论:酶促反应的动力学参数为蒜酶寻求有利的反应条件、更大限度地提高酶反应的效率提供了参考数据。     

可溶性固定化木瓜蛋白酶的制备及其性质研究

目的 制备一种可溶性固定化木瓜蛋白酶并对其部分酶学性质进行研究.方法 将木瓜蛋白酶偶联在亲水性高分子聚合物羧甲基纤维素醋酸琥珀酸酯(AS-L)上制备得到水溶性固定化木瓜蛋白酶.在相同的条件下测定游离的木瓜蛋白酶和水溶性固定化木瓜蛋白酶的活力,得到两种状态的酶的最适作用pH值和最适作用温度,再于它们各自的最适条件下测定活力,得到各自的Km值;在相同的条件下测定两种状态的酶的热稳定性、酸碱稳定性、低温稳定性和回收稳定性.结果 游离木瓜蛋白酶和可溶性固定化木瓜蛋白酶的最适作用pH值分别为6.0和5.0,最适作用温度分别为60℃和70℃,Km值分别为2.53、3.07mg·ml-1;可溶性固定化木瓜蛋白酶在60℃条件下,保温12h,仍有62%的活性;在4℃条件下,30d后活性保留达90%以上;在pH6.0时稳定性最好,在pH4.0-7.0范围内也比较稳定(相对活性＞80%).结论 可溶性固定化木瓜蛋白酶能够在pH5.5以上的溶液中完全溶解,最适作用pH值范围变窄,最适作用温度和Km值升高;热稳定性和酸碱稳定性均明显增强.     

叶酸-PGA偶联酶的制备及体外催化活性动力学性质

目的制备叶酸与青霉素酰化酶G（PGA）偶联酶并测定其体外催化活性动力学性质，为叶酸导向酶催化前体药物的肿瘤冶疗（FDEPT）奠定基础。方法通过双功能偶联剂1-乙基-3-（3-二甲氨基丙基）碳二亚胺（EDC）将叶酸与PGA偶联．产物经Sephadex G-25纯化。根据叶酸在363nm处的摩尔吸收系数计算偶联比。以PDAB法测定偶联酶的催化活性。结果偶联酶的偶联比为3～4；比活约为29.8U／mg；偶联酶和原酶作用的最适pH均为8.0，最适温度为55℃，偶联酶和原酶在pH5～8的范围内都较稳定，Km和Vmax值分别为4.92μmol／ml，3.28U／ml和4.71μmol／ml,37U／ml。结论叶酸与PGA偶联不会导致PGA催化活性降低。     

人肝谷胱甘肽过氧化物酶的动力学性质

从人肝中分离获得谷胱甘肽过氧化物酶，其最适pH为8．5，最适温度为37℃。该酶以H2O2或GSH为鹿物时表观Km值分别为0．27mmol／L和1．3mmol／L。酶与多分子鹿物作用的动力学研究表明人肝谷胱甘肽过氧化物酶的作用为乒乓机制。并观察了一些金属离子和烷化剂对该酶具有不同程度的抑制作用。     

固定化牛肾氨基酰化酶拆分法制备D—丙氨酸

研究了以中空纤维固定化牛肾氨基酰化酶拆分ＤＬ－Ａｌａ制备Ｄ－Ａｌａ及反应的各种优化条件和固定化酶的动力学性质。实验结果表明,固定化酶反应的最适ｐＨ为７．０,最反应温度为３０￣３５℃;固定化酶拆分反应的酶量选择为５ｍｇ／ｍｌ,时空体积ＳＶ＝１．０,在ｐＨ７．０,３０℃条件下的全拆分底物浓度为０．１ｍｌ／Ｌ。固定化酶常温１周内拆分率稳定,但对热不稳定,４０℃条件下放置３０ｍｉｎ活力下降３０％。     

纳米二氧化硅固定木瓜蛋白酶性能研究

目的：研究固定化木瓜蛋白酶的性质。方法：以纳米二氧化硅为载体,戊二醛为交联剂,制备固定化木瓜蛋白酶。研究木瓜蛋白酶的最佳固定化条件以及固定化酶的酶学性质和动力学参数。结果：固定化酶的最适反应温度70℃,最适反应pH值为7.5,酶活回收率可达61.5％。结论：固定化酶催化的活性与游离酶相比不受显著影响。     

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.     

Development on Adjustable Calibration Marker for Shock Wave Focus

Shock wave lithotripsy （SWL） is a treatment of choice for upper urinary stones. However, this procedure is inappropriate for obese patients because the focus is often unable to reach the target owing to the limited focal distance in shock wave source. Although treating such patients in a blast path may increase the application length of shock wave source, it＇s difficult to find this path on the lithotripter monitor. For this reason, we invented an adjustable calibration marker in order to set an effective focus in the shock wave hath.     

Study on the TCM Pathogenesis of Angiopathic Complications of Type II Diabetes

Excess production of reactive oxygen species(ROS)of mitochondrion mediated by hyperglycemia is the common pathogenesis of angiopathic complications of diabetes.TCM holds that the damp from the dysfunction of spleen.kidney and liver is the causative factor of complications of diabetes.This is similar to the mechanism of Ros resulting in angiopathic complications of diabetes.When the angiopathic complications of type II diabetes mellitus(T2DM)are difierentiated as caused by turbid damp in TCM can be explained as ROS.Since the obstruction of pathogenic damp in channels and collaterals is said to be the main pathogenesis,the treating principle should be dissolving the damp to remove the obstruction.     

Leptin, Ghrelin and TNF-α before and after Hypo-caloric Traditional Chinese Diet and Auricular Acupuncture

INTRODUCTION Obesity is a complex emergent problem, which can be possibly solved not only by the diet but also by the life style and promotion of a constant physical exercise. 1, 2 No doubt careful attentions must be given to the nutritional condition of obese people, the dietary habits, the somatic build (i.e. distribution of fat mass) and the organic functions linked to formation of the fat mass. All the parameters should be constantly monitored before, during and after a diet treatment. 3, 4, 5     

Relationship between Dysglycemia and Carotid Atherosclerosis in Tibetan Population

People with dysglycemia are at high risk for atherosclerotic diseases. This study aims at investigating the atherosclerotic vascular damage in dysglycemia and its metabolic origin in Tibetan population.     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

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.     

CLINICAL SIGNIFICANCE OF SERUM CYTOKINES IL-1β,sIL-2R,IL-6,TNF-α,AND IFN-v IN ACUTE CORONARY SYNDROME

Objectives To explore serum cytokines levels (including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v) and their significance in patients with acute coronary syndrome (ACS) and the subsequent follow-ups, with attempt to estimate the role of various serum inflammatory markers in the diagnosis and assessment of ACS.Methods The study population include 40 patients with acute myocardial infarction (AMI), 40 patients with unstable angina pectoris (UAP), and 40 controls. Among the 80 patients, 60 patients attended a follow up 4 months later. Serum inflammatory markers including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v were measured by enzyme linked immunosorbent assay.Results Serum IL- 1 β, sIL-2R, IL-6, TNF-α were significantly higher in AMI group or UAP group compared to the control group and became significantly lower 4 months later in the follow-up patients. Serum levels of IFN-v shows no significant difference between AMI group or UAP group and controls, also showing no significant change when measured in follow up patients. There was no correlation between serum creatine kinase-MB isoenzyme levels and serum inflammatory markers either in UAP or AMI group. Furthermore, when divided into two subgroups using Wagner's QRS scoring system in the AMI group, there is no difference of each serum inflammatory marker between ≤ 6 scores group and ＞ 6 scores group.Conclusion Serum levels of certain inflammatory markers may have some diagnostic value for ACS, and can be a useful marker reflecting disease stability.