新疆4种绢蒿属植物及近缘种银蒿的ITS/ITS2条形码鉴定研究

目的：评价ITS/ITS2热点条形码序列对新疆4种绢蒿属植物及其近缘种银蒿的鉴别能力,为绢蒿属植物分类鉴定提供分子参考依据。方法：对15份绢蒿属及银蒿植物样本进行DNA提取、PCR扩增、双向测序,采用CodonCode Aligner软件对序列峰图进行校对拼接,MEGA6.0分析序列碱基组成及变异,计算K2P遗传距离并构建聚类邻接树,预测ITS2序列二级结构,评估鉴别能力。结果：西北绢蒿、针裂叶绢蒿种内变异位点及信息位点数均小于银蒿。ITS序列种间、种内遗传变异均大于ITS2序列。ITS/ITS2 序列邻接（NJ）树均聚为3支,绢蒿属、银蒿1、银蒿2。绢蒿属ITS2序列二级结构与银蒿有差异。结论：通过ITS/ITS2序列的种间K2P遗传距离、邻接树、ITS2序列二级结构分析,ITS、ITS2序列具很好的属鉴定效果,不同产地的针裂叶绢蒿被区分开。     

Effects of Gossypium herbaceam extract administration on the learning and memory function in the naturally aged rats: neuronal niche improvement

Aging-associated cognitive impairment is an important health care issue since individuals with mild cognitive impairment are more likely to develop Alzheimer's disease. In the present study, the protective effect of Gossypium herbaceam extracts (GHE) on learning and memory impairment associated with aging were examined in vivo using Morris water maze and step through task. Furthermore, the antioxidant activity and neuroprotective effect of GHE was investigated with methods of histochemistry and biochemistry. These data showed that oral administration with GHE at the doses of 35, 70, and 140 mg/kg exerted an improved effect on the learning and memory impairment in aged rats. Subsequently, GHE afforded a beneficial action on eradication of free radicals without influence on the activity of glutathione peroxidase and superoxide dismutase. GHE treatment enhanced the expression levels of nerve growth factor. Meanwhile, proliferation of neural progenitor cells was elevated in hippocampus after treatment with GHE. Taken together, neurogenic niche improvement could be involved in the mechanism underlying neuroprotection of GHE against aging-associated cognitive impairment. These findings suggested that GHE might be a potential agent as cognitive-enhancing drugs that delay or halt mild cognitive impairment progression to Alzheimer's disease or treatment of aging-associated cognitive impairment.     

甘草次酸/11-脱氧甘草次酸甲酯的合成

以甘草次酸为原料,采用经典的克莱门森还原制备了11-脱氧甘草次酸,接着在不同的催化体系中(浓硫酸、浓盐酸、干盐酸气)研究了合成了甘草次酸甲酯的最佳条件,结果表明以干盐酸气催化可获得较高的产率。并在该条件下合成了11-脱氧甘草次酸甲酯。合成的化合物经过IR,1HNMR,13CNMR等进行了表征。     

A new perspective to assess relaxation time of tumor.

The dissimilarities in spin-lattice relaxation time (T1) of water proton from one tumor to the other is due to the yield of hypoxic fraction in the tumor. The yield of higher relaxation time (T1) in the KHT tumor compared to the RIF-1 tumor as a function of growth is due to the hypoxic fraction of the tumor. The hypoxic fraction in the tumor is also responsible for the P-31 spectral parameter changes.     

艾拉片对重复束缚应激所致勃起功能障碍小鼠的治疗作用

艾拉片是由经典维医方药Majun Mupakhi Ela优化提取制备得到的.该方一直用于阳痿的治疗,但艾拉片的具体适应证和治疗机制尚不清楚.本研究拟探讨艾拉片对重复束缚应激所致勃起功能障碍(ED)小鼠的保护作用及其可能机制.每天将小鼠置于束缚盒中连续14天,并在束缚前1小时给予艾拉片.第14日晚进行交配实验.此后,收集...     

Measurement of metabolic extraction of tracers in the lung using a multiple indicator dilution technique

Selective pulmonary uptake of many natural and synthetic substances has been demonstrated by physiologists and pharmacologists using isolated perfused lung preparations or invasive techniques. It is difficult, however, to relate these laboratory studies to disease processes and to the study of problems encountered in a clinical environment. Our goal was to develop a noninvasive method for studying the pulmonary uptake of tracer substances using available radiotracers, gamma cameras, and computers that would give information similar, if not identical, to that from the invasive laboratory methods, and that could be applied in a clinical setting. The multiple-indicator dilution technique, modified for external counting, is well suited for such studies of pulmonary uptake of tracer substances. In this study, Tc-99m micro sulfur colloid (Tc-99m micro SC) was used as an intravascular reference tracer, N-isopropyl-p-[123I]iodoamphetamine (I-123 IMP) as a cellular test tracer amine, and In-111 DTPA as an extracellular tracer. Calculated first-pass lung uptakes of I-123 IMP and In-111 DTPA were 0.92 +/- 0.04 and 0.17 +/- 0.04, respectively, relative to the reference tracer. Using this approach, the first-pass pulmonary extraction of a variety of radiolabeled test tracers can be measured in a clinical environment in a variety of physiologic settings.     

Correlation between oxygen tension and spin-lattice relaxation rate in tumors

The role of oxygen in influencing the spin-lattice and spin-spin relaxation mechanism in liquids has been known for decades. However, no concerted effort has been made to find a correlation between relaxation rates and oxygen dissolved in cell water. A procedure has been developed that allows both in vitro and in vivo measurement of oxygen tension in tumors and helps to calculate spin-lattice relaxation rate.     

新疆道地药材中二萜类生物碱的核磁共振特征与抗肿瘤活性分析

目的归纳总结从新疆本地的几种翠雀属植物和乌头属植物中分离得到的二萜类生物碱的核磁特征以及这些生物碱的抗肿瘤活性。方法运用核磁共振¹H-NMR和¹³C-NMR测定二萜生物碱化合物的特征峰,在结构解析中还采用了COSY、HMBC、HSQC和NOESY等实验方法,应用MTT法对这些生物碱的抗肿瘤活性就行评价。结果总结了该类化合物的结构与核磁共振¹H-NMR与¹³C-NMR数据之间的关系及规律,并对氮杂缩醛等特殊结构单元的¹H-NMR和¹³C-NMR化学位移值范围进行了归纳,同时发现部分化合物对人宫颈癌细胞HeLa细胞,人肺腺癌细胞A549细胞株表现出较好的细胞毒活性。结论对二萜生物碱化合物的结构特征进行了总结,为进一步寻找高效低毒的二萜生物碱化合物奠定了基础,同时为利用结构修饰来减毒增效提供科学依据。     

玫瑰花药材的HPLC指纹图谱研究

目的:采用HPLC法建立新疆和田玫瑰花药材的指纹图谱。方法:色谱柱Inertsil ODS-3(4.6 mm×250mm,5μm),流动相为A[甲醇∶乙腈(1∶1)]-B(0.06%的三氟乙酸溶液),程序梯度洗脱;流速:1.0 mL/min;柱温:32℃;检测波长:254 nm。结果:检测了13批玫瑰花药材,标定了9个共有峰,相似度较好,达到了中药指纹图谱研究的技术要求。结论:本方法准确、可靠,建立的HPLC指纹图谱为玫瑰花药材的质量控制提供更全面的信息。