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991.
Pituitary Adenylate-Cyclase-Activating Polypeptide (PACAP) Binding Sites and PACAP/Vasoactive Intestinal Polypeptide Receptor Expression in Human Pituitary Adenomas 下载免费PDF全文
992.
Integrated YAC Contig Map of the Prader–Willi/Angelman Region on Chromosome 15q11–q13 with Average STS Spacing of 35 kb 下载免费PDF全文
Susan L. Christian Nehal K. Bhatt Scott A. Martin James S. Sutcliffe Takeo Kubota Bing Huang Apiwat Mutirangura A. Craig Chinault Arthur L. Beaudet David H. Ledbetter 《Genome research》1998,8(2):146-157
Prader–Willi syndrome and Angelman syndrome are associated with parent-of-origin-specific abnormalities of chromosome 15q11–q13, most frequently a deletion of an ~4-Mb region. Because of genomic imprinting, paternal deficiency of this region leads to PWS and maternal deficiency to AS. Additionally, this region is frequently involved in other chromosomal rearrangements including duplications, triplications, or supernumerary marker formation. A detailed physical map of this region is important for elucidating the genes and mechanisms involved in genomic imprinting, as well as for understanding the mechanism of recurrent chromosomal rearrangments. An initial YAC contig extended from D15S18 to D15S12 and was comprised of 23 YACs and 21 STSs providing an average resolution of about one STS per 200 kb. To close two gaps in this contig, YAC screening was performed using two STSs that flank the gap between D15S18 and 254B5R and three STSs located distal to the GABRA5–149A9L gap. Additionally, we developed 11 new STSs, including seven polymorphic markers. Although several groups have developed whole-genome genetic and radiation hybrid maps, the depth of coverage for 15q11–q13 has been somewhat limited and discrepancies in marker order exist between the maps. To resolve the inconsistencies and to provide a more detailed map order of STSs in this region, we have constructed an integrated YAC STS-based physical map of chromosome 15q11–q13 containing 118 YACs and 118 STSs, including 38 STRs and 49 genes/ESTs. Using an estimate of 4 Mb for the size of this region, the map provides an average STS spacing of 35 kb. This map provides a valuable resource for identification of disease genes localized to this region as well as a framework for complete DNA sequencing. 相似文献
993.
目的 探讨孤束核联合亚核前部(acNTS)损伤在慢性束缚应激(CRS)所致的胰岛素抵抗性高血糖症发生中的作用。 方法 采用CRS大鼠模型(n=20;7 d束缚+3 d自由活动,共40 d),检测葡萄糖代谢相关指标。 结果 CRS导致约1/3的个体(n=7)持续性的中度胰岛素抵抗性高血糖(空腹血糖不超过11 mmol/L)。CRS高血糖鼠acNTS可观察到神经元染色浓缩,Caspase-3表达和TUNEL阳性染色,提示出现神经元凋亡样改变。机械损伤acNTS(n=6),空腹血糖水平逐渐升高,也能导致胰岛素抵抗性高血糖, 且高胰岛素血症、胰岛平均体积增大和血清皮质酮水平不变等特点与CRS小鼠一致。 结论 CRS损伤了acNTS的葡萄糖敏感神经元,从而使血糖调节紊乱。 相似文献
994.
Yee Huang Ku Yin Ching Chuang Wen Liang Yu 《Journal of microbiology, immunology, and infection》2008,41(4):332-336
BACKGROUND AND PURPOSE: Strains of extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae have spread widely in Taiwan hospitals. In this study, we evaluated the in vitro antimicrobial activity of tigecycline against ESBL-producing Enterobacteriaceae, including Klebsiella pneumoniae, Serratia marcescens and Enterobacter cloacae. METHODS: 104 confirmed ESBL-producing bacteria were isolated from 4 hospitals in mid- and southern Taiwan between 2000 and 2006. The in vitro activity of tigecycline against these ESBL producers was tested by use of Etest strips. RESULTS: The minimal tigecycline concentration at which 50% of isolates were inhibited and minimal concentration at which 90% of isolates were inhibited for ESBL-producing isolates ranged from 0.38 to 0.75 mug/mL and 0.5 to 1.5 mug/mL, respectively. CONCLUSIONS: Tigecycline, a new semisynthetic glycylcycline, may be considered an alternative drug of choice for patients infected with ESBL-producing bacteria. 相似文献
995.
目的:研究注射用清开灵冻干粉对临床分离致病菌的体外抗菌活性。方法:注射用清开灵冻干粉与市售清开灵注射液作比较,采用二倍稀释法,测定注射用清开灵冻干粉浓缩液对临床分离的47株致病菌的最低抑菌浓度(MIC)及最低杀菌浓度(憾),观察注射用清开灵冻干粉体外抗菌活性。结果:对金葡菌、大肠埃希菌、铜绿假单孢菌、肺炎克雷伯菌,注射用清开灵冻干粉与市售清开灵注射液均显示出良好的体外抗菌活性,注射用清开灵冻干粉体外抗菌活性强于市售清开灵注射液。按药液稀释度计算,注射用清开灵冻干粉浓缩液对金葡菌、大肠埃希菌、铜绿假单孢菌、肺炎克雷伯菌的MIC和MBC分别为市售清开灵注射液的1/4-1/2。结论:注射用清开灵冻干粉对临床分离的致病菌,具有较好的抗菌活性,且略优于市售清开灵注射液。 相似文献
996.
997.
成年大鼠去皮层血管引起前脑室下区祖细胞增殖迁移并形成迁移路至损伤部位(一)祖细胞增殖迁移的部位在背外侧脑室下区 总被引:3,自引:1,他引:3
成年哺乳动物脑室下区(SVZ)富有神经干细胞、神经细胞祖细胞和胶质细胞祖细胞,它们能生成新的神经细胞、星状胶质细胞和少突胶质细胞。SVZ中的神经细胞祖细胞能形成切线形式的嘴侧迁移流(RMS)到嗅球,在嗅球分化成成熟的中间神经元。近年来证明成年动物实验性脑损伤和变性疾病都能引起SVZ细胞增生并能向非嗅球区迁移。本研究将成年大鼠一侧大脑皮层血管去除,15d和30d后取前脑作冠状及矢状连续切片,用BrdU和PCNA抗体显示前脑室下区正在分裂的细胞;用Tuj1抗体显示神经元祖细胞;用GFAP和vimentin抗体显示胶质细胞祖细胞。结果证明去除一侧皮层血管引起术侧及其对侧的背外侧脑室下区(dl-SVZ)的上述免疫反应阳性细胞明显增多,并向胼胝体迁移,在胼胝体内形成放射形式迁移路至损伤部位。本研究表明背外侧脑室下区的范围应包括背外侧角、外侧伸展和侧脑室上壁的SVZ,它们是切线形式和放射形式两种不同方向的迁移路祖细胞的共同源地。 相似文献
998.
Identification of genotype 3 hepatitis E virus (HEV) in serum and fecal samples from pigs in Thailand and Mexico, where genotype 1 and 2 HEV strains are prevalent in the respective human populations 总被引:8,自引:0,他引:8 下载免费PDF全文
Cooper K Huang FF Batista L Rayo CD Bezanilla JC Toth TE Meng XJ 《Journal of clinical microbiology》2005,43(4):1684-1688
999.
Chun Chang John Lipian Dennis A. Barnes Larry Seger Cheryl Burns Brian Bennett Laura Bonney Larry F. Rhodes George M. Benedikt Robert Lattimer Shyhchang S. Huang Victor W. Day 《Macromolecular chemistry and physics.》2005,206(19):1988-2000
Summary: Homopolymers of a bis‐trifluorocarbinol substituted norbornene ( 1 ) (α,α‐bis(trifluoromethyl)bicyclo[2.2.1]hept‐5‐ene‐2‐ethanol or HFANB) and copolymers of 1 with t‐butyl ester of 5‐carboxylic acid ( 2 , t‐BuEsNB) were produced using palladium catalysts and olefinic chain transfer agents such as 1‐hexene and ethylene to control molecular weight. However, these low‐molecular‐weight polymers exhibited relatively low optical transparencies at 193 nm. In fact, the opacity (measured as optical densities in absorbance units per micron) of thin films of these homo‐ and co‐polymers was inversely proportional to their molecular weight. This relationship is consistent with an end group contribution to the film opacity. Spectroscopic analysis of these polymers by 1H NMR and MALDI‐TOF MS confirmed that 1‐hexene and ethylene chain transfer agents generated olefin‐terminated vinyl addition polymers. The olefinic end group contribution to optical density can be eliminated by appropriate chemical modification. Both epoxidation and hydrogenation of the polymer olefinic end groups generated very low optical density materials, independent of molecular weight, that are suitable as 193‐nm photoresist binder resins.
1000.
Rb基因在鼻咽癌中存在状态的研究 总被引:1,自引:1,他引:1
首次应用生物素-14-dUTP标记Rb3.8kb探针,结合亲合素-碱性磷酸酶发光及自显影法,对Rb基因在鼻咽癌中存在状态进行了研究。杂交结果表明,3例正常胎儿鼻咽组织出现分子量为12.8、10.2、8.0、6.2、5.6、5.2及4.8kb的7条杂文区带,11例鼻咽癌组织均发现有Rb基因缺失或失活,其中4例为5.6kb片段缺失,4例为4.8kb缺失并有2例伴5.6kb减弱,2例为10.2kb缺失,1例为5.6及5.2kb片段显著减弱,说明在上述11例鼻咽癌中均有Rb基因的改变。这种高频率的异常变化,提示Rb基因的缺失或失活,与鼻咽癌的发生有密切关系。 相似文献