A novel improved design for the first-generation glucose biosensor

A novel improved design for the first-generation glucose biosensor@Wang J     

蛇毒抗高凝状态酶、氟尿嘧啶对BEL-7404细胞作用的实验研究

目的通过蛇毒抗高凝状态酶（AHCSE）、氟尿嘧啶（5-FU）对人肝癌细胞BEL-7404（简称7404细胞）、正常LO2肝细胞（简称LO2细胞）作用的比较，研究AHCSE对肝癌的作用以及探讨其可能的作用机制。方法应用光学显微镜、透射电镜、MTT法、TUNEL、FCM等方法观察7404细胞、LO2细胞经过AHCSE、5-FU处理后，细胞形态学、生物化学等方面的变化。结果7404细胞、LO2细胞经过AHCSE、52FU处理后，发生了形态学改变；小剂量AHCSE对7404细胞具有很强的抑制作用，但对LO2细胞几乎无影响；随着剂量的加大，AHCSE对7404细胞抑制率上升不明显，但是出现对LO2细胞的抑制作用。经AHCSE作用后，7404细胞发生了凋亡，凋亡率随AHCSE浓度的增加而增加；与5-FU对7404细胞作用相似，但5-FU对LO2细胞抑制作用明显增强。结论AHCSE、5-FU对BEL-7404细胞均有很强的抑制作用，诱导细胞凋亡是其作用机制之一，AHCSE可能成为一种新的肝癌细胞凋亡的诱导剂。     

代谢酶基因多态性与胰腺癌易感性研究进展

代谢酶基因多态性与肿瘤的关系是近来国内外研究的热点。代谢酶基因多态性使酶的活性发生改变，是胰腺癌遗传易感性的重要机制。现综述了与胰腺癌癌变过程中有关的代谢酶基因多态性与其易感性的关系。     

短期用药对幽门螺杆菌检测结果的影响

目的：研究短期不规则用药对幽门螺杆菌(Hp)检测结果的影响。方法：136名慢性胃炎及消化性溃疡的住院患，根据病史分为服药组即Hp检查前一周内接受过铅剂、抑酸剂治疗的患，共四例。对照组即Hp检查前未接受过药物治疗的患考，共37例。Hp检查方法包括①血清学方法；②快速尿素酶试验(RUT)；③组织学方法；④13c—尿素呼气试验(13C—UBT)。结果：服药组RUT，组织学，13C—UBT方法Hp检出率分别为9．0％，21．2％，27．3％，均显低于对照组相应Hp检出率37．8％、40．5％、48．6％(P＜0．01，P＜0．05，P＜0．05)。两组血清学方法Hp IgG、IgM阳性率各为48．5％，51．5％和54．1％，54．1％(P＞0．05)。单独服用质子泵抑制剂组RUT，组织学方法Hp检出率4．0％，16．0％显低于对照组相应方法Hp检出率(P＜0．01，P＜0．05)。单独服用枸橼酸铋钾、H2受体拮抗剂患中各方法Hp检出率与对照组检出率无显性差异(P＞0．05)。单独服用枸橼酸铋钾、H2受体拮抗剂、质子泵抑制剂三组Hp感染率14．3％、15．0％、16．0％均显低于对照组Hp感染率46．0％(P＜0．05)。结论：Hp检查前短期使用铋剂、抑酸剂可导致Hp检出率下降，短期使用质子泵抑制剂可显降低RUT、组织学方法Hp检出率；各方法中快速尿素酶试验检出率最低。血清学方法检测Hp抗体不受药物影响。     

Validation of analytical parameters of a competitive direct ELISA for aflatoxin B1 in peanuts

Analytical validation of a competitive direct SUNQuik ELISA with a reference High Performance Liquid Chromatography (HPLC) method and other methods including a minicolumn method and the VICAM Aflatest® system for aflatoxin in peanuts was conducted. Both the ELISA and the VICAM Aflatest® system, using the same peanut extracts were analytically comparable with the HPLC method (R=0.998, p<0.000). The minicolumn method was also found to be acceptable as a low cost rapid semi-quantitative test. Despite the large variation in sampling, the correlation between the SUNQuik ELISA and HPLC using the different peanut sub-samples was considered acceptable over the range of 0–1200 µg kg^?1 (R=0.938). No false negatives were found using the SUNQuik ELISA and false positives were either nil or negligible in all the studies conducted. The repeatability of the SUNQuik ELISA run on the same day was good with only±10% deviation. The reproducibility of the SUNQuik ELISA between days was also acceptable, but with a higher deviation. Applying the SUNQuik ELISA for aflatoxin surveys of peanuts in Indonesia proved that the method can deliver high quality, cost- and time-effective analysis with very little establishment capital and maintenance.     

单甲氧聚乙二醇化学修饰药物酶的研究进展

用单甲氧基聚乙二醉(1)化学修饰药物酶是生化药物研究开发的重要手段之一。本文综述了1化学修饰药物酶的一般方法及修饰后酶在生物和理化性质方面的变化，同时对1研究前景进行展望，并指出了尚待解决的问题。     

斑点免疫渗滤法检测丙肝IgG抗体试剂盒的研制

用基因工程重组的丙肝抗原包被于硝酸纤维素膜，建立了检测丙肝ＩｇＧ抗体的斑点免疫渗滤法。与ＥＬＩＳＡ试剂盒进行双盲式同步测定，二法检验结果差异无显著性。渗滤法简便快速，适用于各级医院，有很强的推广价值。     

Dose-response differences in the ability of ramipril to improve retention in diabetic mice

Ramipril blocks the conversion of angiotensin I to II. The literature indicates that diabetes is often associated with mild impairment of learning and memory. The study reports the effects of ramipril on memory retention in diabetic and non-diabetic mice. Mice were made diabetic by an injection of streptozocin. After overt signs of diabetes were present, diabetic or vehicle-treated mice were partially trained on a footshock active avoidance task. Immediately after training, ramipril (0.5–1.5 mg/kg s.c.) was administered and retention was tested by continuing training one week later until mice avoided footshock on five out of six trails. The results indicate that ramipril enhanced retention of both diabetic and control mice but it required about 5 times as much ramipril in diabetic as control mice to achieve the same effect on retention. Increased sensitivity to angiotensin II may play a role in cognitive impairment in diabetes.     

Characteristics of antibody responses induced in mice by protein allergens

Whereas many foreign proteins are immunogenic, only a proportion is also allergenic, having the capacity to induce the quality of immune response necessary to support the production of IgE antibody. We have demonstrated previously that intraperitoneal administration to mice of proteins such as ovalbumin (OVA) or the industrial enzyme A. oryzae lipase, which possess significant allergenic potential, stimulates the production of both IgG and IgE antibody. Identical exposure to bovine serum albumin (BSA), a protein with limited potential to cause immediate respiratory or gastrointestinal hypersensitivity reactions, induced IgG responses only. In the current investigations, the quality of immune responses induced following exposure to these proteins via mucosal tissue (intranasal) has been compared with those provoked following administration via a non-mucosal (intraperitoneal) route of exposure. Intranasal or intraperitoneal administration of BSA, OVA or A. oryzae lipase elicited in each case vigorous IgG and IgG1 antibody responses. For all three proteins, at every concentration tested, and via both routes of exposure, IgG1 antibody titres paralleled closely IgG titres. However, the three materials displayed a differential potential to provoke IgE responses and this correlated with their known allergenic potential in humans. Thus, OVA and A. oryzae lipase stimulated strong IgE antibody responses, whereas BSA provoked low titre IgE only at the highest concentration tested (5% administered intraperitoneally). The quality of induced responses was not affected by the route of exposure. It would appear, therefore, that the stimulation of IgG and IgG1 antibody responses is a reflection of protein immunogenicity whereas protein allergenicity is associated with the induction of strong IgE responses.     

蛇毒治疗不能解释肺动脉高压的研究

本通过对不能解释的肺动脉高压患，进行右心导管测定肺动脉平均压（ＰＡＭＰ）作为主要对照指标，观察蛇毒制品（精制溶栓酶）的急性药物试验和近期药物试验。发现该药物在近期有理想的降低ＰＡＭＰ作用，症状及胸片、超声心动图异常也明显取得改善，提示其可能为治疗该病的理想药物。