鱼类LZF—I DNA指纹探针的设备

利用Ｏｌｉｇｏ １０００ＤＮＡ合成仪合成了长庶４５ｂｐ的寡核苷酸单链,经纯化后用同位素γ－＾３２Ｐ－ＡＴＰ作５‘末端票房后,制备鱼类ＬＺＦ－Ｉ ＤＮＡ指纹探针。通过对鱼类的九体实验,亲子鉴定实验,组织细胞的稳定性实验和鱼类种类的适用范围实验后,测得：（１）ＬＺＦ－Ｉ ＤＮＡ指纹探针属多位点寡核苷酸探针;（２）ＬＺＦ－Ｉ ＤＮＡ指纹殖在鱼类种群中的临别机率为９．２３－１０＾０１６;（３）ＬＺＦ－Ｉ     

大熊猫基因指纹探针F2ZGP96060801的研制及比较实验分析

利用ＡＢＩ－３９４型ＤＮＡ合成仪合成的寡核苷酸５－「Ａ（Ｘ）ｎ－ｘＴＣＣＡＣ」ｎ－３,经高效液相色谱仪纯化后,制备成了命名为为Ｆ２ＺＧＰ９６０６０８０１的大熊猫基因指纹探针,用同位素标记法标记Ｆ２ＺＧＰ９６０６０８０１,ＬＺＦ－Ｉ、朋５、３３．６和（ＣＡＣ）６／ＧＴＧ）５等５种基因指纹探针,比较检测了大熊猫随机个体的被毛、大熊猫３雄配Ｉ雌所产１个双胞胎计６只个体的福尔马林固定的肝组织和粪便中的胃肠     

小熊猫圈养种群遗传多样性及其影响因子

利用寡核苷酸指纹探针ＬＺＦ－Ｉ检测了成都大熊猫繁育研究基地仿生态圈养场小熊猫种群全部２２只个体的ＤＮＡ指纹,检测结果表明其遗传多样性参数如下：⑴各体间ＤＡＮ指纹图的相似性为０．１７２;个体Ａ的指纹谱带在个体Ｂ中出现的概率为０．１８０６。⑵圈养种群的等位基因频率为０．０９４８,杂合率为９０．５２％,⑶种群中指名亚种亲本个体的引进是影响该种群遗传多样性的主要因子。     

人βNGFDNA地高辛标记探针的制备及在小鼠颌下腺中的基因表达

本研究在国内首先制备非放射性地高辛标记的人βＮＧＦＤＮＡ（ｄｉｇ－ｈ－βＮＧＦＤＮＡ）探针,并应用原位杂交技术结合计算机图像分析,对ＮＧＦｍＲＮＡ在ＩＣＲ雄性小鼠颌下腺中的分布进行了观察。实验结果显示ＮＧＦｍＲＮＡ主要分布于颌下腺纹状管（ＳＳＴ）和颗粒曲管（ＧＣＴ）的上皮细胞,其细胞基底部胞质呈杂交反应强阳性,细胞顶部呈弱阳性,图像分析显示二者具有显著性差异。本实验制备的ｄｉｇ－ｈ－βＮＧＦＤＮＡ探针灵敏度高达０．１ｐｇ／ｍｌ,并且特异性强,分辨力高,重复性好,是研究ＮＧＦｍＲＮＡ基因表达和调控的有力工具。     

EGFR反义脱氧寡核苷酸及其硫代修饰片段抑制人肝癌细胞系BEL…

本文旨在研究针对ＥＧＦＲ ｍＲＮＡ的反义寡核苷酸片段对ＢＥＬ－７４０４细胞ＥＧＦＲ基因表达及其对细胞生长的影响。合成了互补于ＥＧＦＲ基因５’起始编码区的２１聚脱氧寡核苷酸（ＯＤＮｓ）。实验结果显示,３．２ｕｍｏｌ／Ｌ ＯＤＮｓ明显抑制ＢＥＬ－７４０４细胞生长,「３Ｈ」Ｔｄｒ掺入抑制试验显示其对细胞ＤＮＡ合成的抑制作用表现剂量依赖性;密度扫描分析显示ＯＤＮｓ处理６、２４ｈ后,肝癌细胞ＥＧＦＲ ｍＲＮ     

花生种子高纯度DNA的提取（简报）

花生种子高纯度ＤＮＡ的提取（简报）王艳,何军贤,傅家瑞（中山大学生命科学学院,广州５０２７５）关键词花生;种子;ＤＮＡ;十六烷基三甲基溴化铵ＲＡＰＩＤＡＮＤＥＦＦＩＣＩＥＮＴＰＵＲＩＦＩＣＡＴＩＯＮＯＦＤＮＡＦＲＯＭＰＥＡＮＵＴ（ＡＲＡＣＨＩＳＨＹＰ...     

大熊猫父权认定的DNA指纹图分析

本文以大熊猫１４胎次,１９只幼子,２５只次雄兽个体的被毛、血液、精液、福尔马林固定的器官组织、粪和尿等为材料作了ＤＮＡ指纹检测。（１）同一大熊猫个体的被毛、血液、精液、固定组织及粪、尿检测,其ＤＮＡ指纹图完全一致。（２）大熊猫无论１雄配１雌,２雄配１雌、３雄配１雌,甚至４雄配１雌,受配雌兽所产任一子代个体的ＤＮＡ指纹图谱中,杂交谱带均分别来自父亲、母亲,以及父母双亲,没有新带出现,无误地认定了１９只幼子的真正父亲,排除了非父。（３）３只大熊猫雌兽的５个双胞胎,即１０只子代个体的ＤＮＡ指纹图谱,均具有个体特异性,表明为异卵双生,其中４个双生子为异卵异父双生,为大熊猫在一个发情期不一定同时排卵提供了佐证,亦为圈养雌兽发情高峰期用多只雄兽作多次配种或输精,能提高受孕产仔率提供了理论和应用依据。（４）ＤＮＡ指纹技术用于大熊猫的亲子鉴定,灵敏稳定,准确无误,为圈养大熊猫多雄配１雌,增加受配雌兽的受孕机会,提高产子率提供了鉴别手段,解除了多雄配１雌,其子代的父亲是谁的后顾之忧。（５）应用寡核苷酸探针ＬＺＦ－１作大熊猫亲子鉴定较ＪＨ１２．６探针更为适合     

不同代龄南方鲶SME—1细胞ENA指纹图的分析

利用荧光素标记ＬＺＦ－ＩＤＮＡ探针对不同培养代龄南方鲶ＳＭＥ－１细胞简单重复ＤＮＡ进行了检测,获得了清晰的ＤＮＡ指纹图谱,发现：随着细胞代龄的增加,同一代龄细胞群体内和不同代龄细胞群体间共有谱带概率,相似系数,最大等位基因频率均明显下降,而突变率则随着代龄增加而增加,利用ＤＮＡ指纹图技术分析ＳＥＭ－１细胞遗传物质的变化是可行的,为ＳＭＥ－１细胞进一步的培养,并为ＳＭＥ－１细胞的研究利用提供了分子遣     

中国东部栗疫病菌群体的遗传分化

本实验采用ＲＦＬＰ技术,对中国东部栗疫病菌进行了群体遗传结构的研究,３１３个参试菌株来自１０个省（市）的１６个群体（子群体）,样本人布在北纬２４°Ｎ－４１°Ｎ。各菌株的ＤＮＡ分别用限制性内切酶Ｐｓｔ Ⅰ和ＥｃｏＲⅠ酶切,先后以１０个低拷贝ＤＮＡ探针和１个ＤＮＡ指纹图谱探针进行了杂交和检测。结果表明,两个探针的杂交图谱呈单态性,其他７个低拷贝探针的杂交图谱都呈多态性、指纹图谱探针的检测结果显示,辽宁     

IL-1预刺激对反义IRAK-1寡核苷酸抑制NF-κB活化的影响

实验分为白介素－１（ＩＬ－１）预处理组和非预处理组,脂质体介导反义ＩＬ－１ 受体相关激酶－１（ＩＲＡＫ－１）寡核苷酸（ＯＤＮ） 转染ＨｅｐＧ２ 细胞,用ｗ ｅｓｔｅｒｎ 杂交分析ＩＲＡＫ－１ 表达水平,以夹心酶联免疫吸附测定法检测ＮＦ－κＢ含量． 结果表明,ＩＬ－１ 非预处理组反义ＩＲＡＫ－１ ＯＤＮ不能抑制ＩＲＡＫ－１ 表达和ＮＦ－κＢ活化,而预处理组ＩＲＡＫ－１ 表达和ＮＦ－κＢ活化受到明显抑制． 反义ＩＲＡＫ－１ ＯＤＮ 对ＮＦ－κＢ活化的抑制作用具有时间（５～２４ ｈ）和剂量（１～８ μｇ）依赖性． 说明ＩＬ－１ 预刺激在反义ＩＲＡＫ－１ ＯＤＮ抑制ＩＬ－１ 诱导的ＮＦ－κＢ活化中起决定性作用．     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

Synthesis and antimicrobial studies of hydrazone derivatives of 4-[3-(2,4-difluorophenyl)-4-formyl-1H-pyrazol-1-yl]benzoic acid and 4-[3-(3,4-difluorophenyl)-4-formyl-1H-pyrazol-1-yl]benzoic acid

Microbial resistance to antibiotics is an unresolved global concern, which needs urgent and coordinated action. One of the guidelines of the Centers for Disease Control and Preventions (CDC) to combat antibiotic resistance is the development of new antibiotics to treat drug-resistant bacteria. In our effort to find new antibiotics, we report the synthesis and antimicrobial studies of 30 new pyrazole derivatives. These novel molecules have been synthesized by using readily available starting materials and benign reaction conditions. Some of these molecules have shown activity with MIC values as low as 0.78?µg/mL against four bacterial strains; Staphylococcus aureus, methicillin-resistant S. aureus, Bacillus subtilis, and Acinetobacter baumannii. Furthermore, active molecules are non-toxic to mammalian cell line.

     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.