一种改进的激光二极管纵向泵浦固体激光器的腔模设计方法

以空间相关的速率方程理论为基础，提出了一种改进的激光二极管纵向泵浦固体激光器的设计方法，给出了在一定泵浦耦合方式下，激光腔模尺寸和输出耦合率最佳值的选取依据，以采用不同耦合系统的端面泵浦Ｎｄ：ＹＡＧ激光器设计实例，相应的实验结果与有理论计算符合得较好。     

细胞内转运载体超支化聚砜胺及其生物相容性

通过制备超支化聚砜胺-异硫氰酸荧光素聚合物(PSA-FITC), 研究其生物相容性、肿瘤细胞对其内吞作用和在正常小鼠体内的生物分布, 以探讨PSA作为载体进行药物和基因体内输送的可行性. 在碱性条件下共价结合PSA与FITC, 形成荧光标记聚合物(PSA-FITC)后测定聚合物中FITC含量. 在不同时间点, 通过流式细胞术检测细胞对聚合物的内吞作用; 正常balb/c裸鼠尾静脉注射PSA-FITC 24 h后, 用小动物活体荧光成像系统研究各脏器聚合物分布. 不同浓度PSA与3T3小鼠成纤维细胞及KB人口腔上皮肿瘤细胞分别孵育24, 48, 72 h后, 通过MTT法测得其生物相容性. 结果表明, PSA生物相容性良好, 72 h的细胞半抑制浓度大于1 mg/mL. 细胞摄入PSA-FITC高效快速, 3 h阳性细胞百分含量为99.24%±1.03%, 且具有时间依赖性. 在正常小鼠体内, PSA在各主要脏器或组织中无明显特异性浓聚. 超支化聚砜胺具有明显生物低毒性和高效细胞内转运特点. 由于其表面功能基团容易改性, 作为载体, 通过连接结合配体或抗体, 在肿瘤的主动靶向治疗中具有广阔的应用前景.     

从层层组装的核壳粒子到医学/生物化学诊断和药物输送*

层层组装的核壳型粒子由于具有尺度和组成的剪裁优点近年来得到了广泛的研究,它们为技术应用如医学/生物化学诊断和药物输送提供了新的机遇.本文综述了基于层层自组装和胶体模板以及采用各种化学和物理方法直接除去核制备磁性复合核壳粒子和空腔球体.给出了核壳粒子在药物输送、生物检测与标记应用的一些实例.     

低温超导磁选机在非金属矿降铁除杂中的应用北大核心

介绍了潍坊新力超导磁电科技有限公司生产的往复式低温超导磁选装备用于部分非金属矿除铁提纯,简述了该设备的磁选机结构、高梯度超导磁体以及分选系统。试验结果表明与常规电磁选机相比,经过超导磁选机分选后的非金属矿精矿产品铁含量都有明显的降低,且适用于多种非金属矿。通过实验证明磁场强度是导致超导磁选优于电磁选的主要因素。     

188Re-labeled hyperbranched polysulfonamine as a robust tool for targeted cancer diagnosis and radioimmunotherapy

Hyperbranched polysulfonamine (HPSA) is a promising biomaterial due to its highly branched spherical architecture and efficient intracellular translocation. To realize the functionalization of HPSA, both N-succinimidyl 3-(2-pyridyldithio) propionate (SPDP) for tethering the human-mouse chimeric monoclonal antibody CH12 and N-hydroxy succinimidyl S-acetylmercaptoacetyltriglycinate (NHS-MAG₃) for labeling ¹⁸⁸Re were sequentially grafted onto the primary amine terminals of HPSA via covalent linkages, attaining the SPDP-HPSA-MAG₃ intermediate. In order to reserve the structural integrity of CH12, the fragment crystallizable (Fc) region was also processed by oxidation of oligosaccharide moieties with sodium periodate and then reacted with N-(κ-maleimidoundecanoic acid) hydrazide (KMUH). After chelating ¹⁸⁸Re with MAG₃ group, the SPDP was reduced to PDP and connected onto the maleinimide group at the Fc region. As a result, both the epidermal growth factor receptor vIII (EGFRvIII) targeted monoclonal antibody CH12 and the radionuclide ¹⁸⁸Re were conjugated to the HPSA-based vehicles, forming the ¹⁸⁸Re-labeled and CH12-tethered HPSA (CH12-HPSA-¹⁸⁸Re). The molecular weight and in vitro stability of CH12-HPSA-¹⁸⁸Re were evaluated by gel electrophoresis and paper chromatography. On one hand, the CH12-HPSA-¹⁸⁸Re could specifically bind to the EGFRvIII-positive human hepatocarcinoma cells in vitro. On the other hand, it could also target at the tumor tissue of nude mice in vivo. Hence, the CH12-HPSA-¹⁸⁸Re could effectively target at the human hepatocarcinoma and facilitate the tumor detection and targeted radioimmunotherapy.     

用于生物探测的PAMAM树形高分子增强免疫磁性微球

采用悬浮聚合的方法制备羧基修饰的聚苯乙烯磁性微球(CMM)，研究了CMM和CMM-PAMAM(第5代)两者与牛血清蛋白(BSA)的结合状况。结果显示；CMM与BSA的结合量为22.2μg／mg。PAMAM偶联在磁性微球表面后，提高了磁性微球表面官能团的密度，因而CMM-PAMAM(第5代)与BSA的结合量可达54．4μg／mg。