Colon cancer refers to cancerous growth in colon,rectum or cecum [1].Oral anti-cancer drug has been advocated as adjuvant,neo-adjuvant or primary therapy.A substantial number of research studies have
The use of gemcitabine is limited,owing to its rapid metabolism by cytidine-deaminase and fast kidney excretion [1].A polymeric conjugate of gemcitabine was prepared by covalent coupling with poly (la
Safe and efficient nucleic acid delivery remains a challenging task since several barriers have to be overcome within the delivery pathway,e.g.efficient nucleic acid complexation,prevention of unspeei
One of the most significant problems of chemotherapy is that even originally very sensitive tumors become often resistant to cytostatic after several cycles of treatment.This so-called multidrug resis
Drug delivery systems (DDS) have appeared as a promising and reliable approach to delivering potent drugs to the site of action precisely and timely,in which polymeric nanosystems including micelles,n
In recent years,chitosan microspheres have attracted more and more attention as a carrier for drug delivery because chitosan has good compatibility,biodegradability,and biological adhesion properties.
Chitosan has been adopted to have great potential in pharmaceutical science due to its outstanding properties including nontoxicity,biocompatibility,biodegradability,mucus-adhesion,and low cost.To pre
Deep brain stimulation (DBS) is a well-developed neurosurgical technique for the treatment of numerous neurological disorders.It is important to understand the cerebral processes triggered by DBS [1].
氙气具有较低的电离能和较高的原子质量,是电推力器通常使用的推进剂.在地面进行电推力器真空试验时,需要采用真空抽气系统抽除真空容器内氙气,国内外早期电推力器大型真空试验设备,通常采用油扩散泵作为氙气主要抽气泵,近年来,随着制冷机的日臻完善,更洁净的制冷机低温泵得到迅速发展,在此类设备上逐渐代替了油扩散泵.兰州华宇航天技术应用有限责任公司根据兰州空间技术物理研究所的长寿面、高可靠性电推力器试验设备需求
非真空累积采样过程中，由于采样系统和氦质谱检漏仪是在测试间的大气环境中，同时采样系统存在负压，+氦质谱检漏仪为真空系统，采样系统管路以及检漏仪本身存在的密封问题会造成测试结果受大气环境影响。由于大气环境中的氦气浓度存在不确定性，进入采样系统或者检漏仪中会造成读数被大气环境拉偏。本文通过实验研究，分析出各个密封环节的影响大小，以及测试读数的变化规律曲线，最终提出明显影响的辨识方法和避免措施。