反相高效液相色谱法测定不同产地紫苏子和白苏子中乌索酸和齐墩果酸

建立反相高效液相色谱（RP—HPLC）法测定了紫苏子和白苏子中乌索酸和齐墩果酸的含量。色谱柱为Kromasil C18柱（250mm×4．6mm,5um）,光电二极管阵列检测（PAD）,流动相甲醇一水体积比为87：13,检测波长210nm,流速0．8mL／min,柱温28℃。乌索酸在10～400ug／mL,齐墩果酸在5～200ug／mL内呈现良好的线性关系,平均加样回收率分别为100．6％和98．7％,相对标准偏差（RSD）分别为1．6％和1．2％。     

高效液相色谱-光电二极管检测器法测定栀子中乌索酸的研究

建立反相高效液相色谱法测定了栀子中乌索酸的质量分数,同时采用光电二极管阵列检测器检测乌索酸色谱峰的纯度。色谱柱为Nuc leosil C18柱(4.6 mm×250 mm,5μm),流动相为甲醇-水(85∶15,V/V),流速0.8 mL.m in-1,检测波长205 nm,柱温25℃。乌索酸在0.1696~1.5264μg范围内线性关系良好(r=0.9999),检出限为0.3 mL-1(3σ),平均回收率为98.0%。方法简便,准确,重现性好,线性范围宽,适于测定栀子药材中乌索酸的质量分数。     

HPLC测定炎消迪娜糖浆中大黄酚的含量

本文用HPLC法测定炎消迪娜儿糖浆中大黄酚的含量。色谱条件：采用Luna 5u C18柱,流动相为甲醇-水（含0．1％醋酸）（98：2,v／v）,检测波长254nm。：大黄酚在0．008～0．088μg（r=0．9997）范围内成线性关系。平均回收率（n=9）为98．79％,RSD为2．24。实验结果表明本法简便,可靠,可用于该制剂的质量控制。     

高效液相色谱法测定妇炎康分散片中原儿茶醛的含量

目的：建立测定妇炎康分散片中原儿茶醛含量的HPLC法。方法：使用ODS—C18柱,在流动相为甲醇-乙腈-水-冰乙酸（5：10：85：1）,检测波长为280nm,柱温为30℃的条件下,对妇炎康分散片中原儿茶醛的含量进行测定。结果：原儿茶醛在0．029-0．176mg·mL^-1。内质量浓度与峰面积呈良好的线性关系,线性回归方程为A=1．87×10^5C-90,r=0,9999,平均回收率为100．1％（RSD=0．48％）结论：该法准确度高、专属性好,可用于妇炎康分散片的含量测定。     

高效液相法测定阿司匹林肠溶片中阿司匹林含量

建立阿司匹林片HPLC含量测定方法。采用Kromasil（C18 150mm×4．6mm,5u）色谱柱,以乙腈-四氢呋喃-冰醋酸-水（23：5：5：61）为流动相;检测波长为280nm;流速1．0mL／min;进样量20uL,柱温：室温。阿司匹林在12．5～250ug／mL范围内有良好的线性关系。平均回收率100.22％,RSD为1．2％。本法操作简便、快速、结果准确、专属性强。     

RP-HPLC法测定泽兰中桦木酸的含量

目的：建立反相高效液相色潽法测定泽兰中桦木酸的含量.方法：采用AlltimaTM-C18（250 mm×4.6 mm,5μm）;以甲醇-0.2％磷酸水溶液=85：15进行等度洗脱,流速为1.0 mL/min,检测波长为202 nm,柱温为35℃.结果：桦木酸的线性范围为3.968～99.200 μg（r=0.997 3）,平均回收率为100.87％.结论：该方法结果准确、简便可行、重复性好,可为泽兰的质量控制提供依据.     

青海省道地药材唐古特大黄中4种蒽醌衍生物的含量测定

用高效液相色谱法：甲醇：0．1％磷酸(85：15),流速为1．0mL／min,检测波长为254nm,柱温为室温,按外标法定量,测定青海省道地药材唐古特大黄中芦荟大黄素、大黄酸、大黄素和大黄素甲醚的含量。结果表明,青海省唐古特大黄中蒽醌衍生物的含量较高,明显高于市售药材,为大黄中的上品。     

裸花紫珠的化学成分

从裸花紫珠(Callicarpa nudiflora Hook.ex Arn.)地上部分的乙醇提取物中分离得到了7个化合物,经波谱分析确定其结构分别为:木犀草苷(1),木犀草素-3'-O-β-D-吡喃葡萄糖苷(2),木犀草素-4'-O-β-D-吡喃葡萄糖苷(3),2α,3α,19α-三羟基-乌索-12-烯-28-酸(4),乌索酸(5),2α-羟基-乌索酸(6)和齐墩果酸(7)。其中化合物2-7为首次从该植物中分离得到。     

用高效液相色谱定量分析分支链氨基酸

目的：周2,4-二硝基氟苯（DNFB）对分支链氨基酸衍生后,采用优化的高效液相色谱（HPLC）对其进行定量分析。方法：色谱柱为AgilentZORBAXEclipsAAA（4．6mm×150mm,5-Micron）,流动相为乙酸盐缓冲液（pH6．4）-乙腈,流速1．0mL／min,检测波长360nm。结果：用HPLC法测定分支链氨基酸的浓度为20-200mg／L时线性关系良好,3种分支链氨基酸的R。均在0．9997以上,平均回收率高,RSD≤0．56％（n=6）。结论：此方法快速、准确、重现性好,适合于对发酵液中分支链氨基酸的定量分析。     

HPLC法测定山茱萸环烯醚萜苷中莫诺苷的含量

使用HPLC测定山茱萸环烯醚萜苷中莫诺苷的含量。色谱柱为C18柱,流动相为甲醇-水（30：70）,流速0．8mL／min,检测波长240nm。本方法简单、灵敏、可靠。线性范围内莫诺苷的标准曲线呈良好的线性关系,平均加样回收率为98．0％,RSD为2．5％。     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.