153 research outputs found

    Anatomy and histology of the reprodustive system of Cymatium pileare

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    毛嵌线螺为雌雄异体。其雄性生殖系统包括精巢、贮精囊、输精管、前列腺、导精沟和阴茎 ;雌性生殖系统包括卵巢、输卵管、蛋白腺、受精囊、卵囊腺、交合囊和外生殖孔。前列腺、导精沟和阴茎中的精子输送通道均为开放型的管道。毛嵌线螺的精子包括具有“9+ 2”微管结构的头部和尾部。雄性个体右触角后的阴茎是从形态上区分雌雄个体的主要标志Cymatium pileare is gonochorism. Its male genital system comststs of testis, vesicula seminalis, vasdeferens prostate gland seminal groove and penis and its female genital system consists of ovary, oviduct,albumin gland, receptaculum seminis, capsule gland bursa copulatrix and vestibule. The sperm delivery ducts in prostate gland, seminal groove and penis are open, and the sperm comprises head and tail with central structure of "9+2" axoneme. The penis behnd the right tentacle of the male is the main morphological feature to be distinguished form the female.湖南省农业百项资助项目! (NB0 0 1

    用于测量J偶合常数的同时多层选择性恒时J分解谱的方法(英文)

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    标量偶合是核磁共振(NMR)波谱的一个重要参数.其中氢-氢偶合能提供关于分子结构的有用信息.但是,在复杂的偶合网络中解析出氢-氢偶合常数(JH-H)较为困难.本文提出了一种基于空间编码选择性恒时演化的测量JH-H的方法,利用一次实验就能解析分子中所有氢核的偶合网络,并测量JH-H.该方法被称为同时多层选择性恒时J分解谱(SMS-SECTJRES).它结合空间编码梯度和选择性恒时演化,并利用平面回波谱成像(EPSI)采样模块,从不同的空间位置提取出对应不同氢核偶合网络的J分解谱,促进了NMR技术在分子结构解析中的进一步应用.the National Natural Science Foundation of China(U1732158 and U1632274)the Key Science and Technique Project of Fujian Province(2018Y0077)the Natural Science Foundation of Guangdong Province(2018A030313794)the Fundamental Research Funds for the Central Universities(20720170036

    一类乘积域的全纯自同构群

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    设Bn为n维复单位球,Um为m维多圆柱.本文利用全纯自同构将边界映为边界的这一性质,得到了乘积域Bn×Um的全纯自同构的一些必要条件,再从这些必要条件出发,成功找到了乘积域Bn×Um的全部全纯自同构.在总的思路上,本篇文章采用的是类似于得到单复变中单位圆盘的Aut(U)的方法,即把零点映为零点的全纯自同构(类似于单复变函数论中的旋转变换)与一类特殊的全纯自同构(类似于单复变函数论中的M bius变换)复合

    B_2×B_2的全纯自同构群

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    讨论B2×B2上的全纯自同构群,并计算它的B ergm an核函数及其自同构的Jacob i行列式

    史氏鲟鱼硫酸软骨素的提取及抗肿瘤活性的研究

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    以史氏鲟鱼软骨为原料,按碱提酶解醇沉的工艺流程,进行硫酸软骨素的碱提工艺优化研究。分别通过碱浓度、碱液温度、碱液量的单因素试验及该3个因素的正交试验,研究其对产品得率及其氨基己糖含量的影响,综合分析得出最佳的碱提工艺为2倍量6%的NaOH,于40℃的水浴中搅拌提取4h;该工艺条件制备鲟鱼硫酸软骨素的得率可高达40.45%,产品质量符合硫酸软骨素口服片(WS1-C3-0030-2000)标准的要求。鲟鱼硫酸软骨素精品和粗品对3种细胞乳腺癌细胞株(MCF-7细胞)、胃癌细胞株(MGc803细胞)、肝癌细胞株(SMMC7721)作用72h时,其IC50分别为7.28mg/mL、7.68mg/mL、4.25mg/mL和8.86mg/mL、9.27mg/mL、7.37mg/mL,与鲨鱼硫酸软骨素精品和粗品有着相似的抗肿瘤活性

    Micro-extraction Determinationof Alkylphenolic Acids in Chinese Patent Medicine GBE with n-hexane Extract by LiquidChromatography - mass Spectrometry

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    正己烷萃取,并用HPLC-UV、HPLC-MS对中成药银杏浸膏(GBE)中微量烷基酚酸进行定性、定量分析。正己烷萃取效率高、共萃杂质少。在优化的实验条件下,平均回收率为98.9%(n=5)。银杏烷基酚酸(M=346)的HPLC-UV检测限为0.1μg/g,线性范围为0.5~10μg/g。With n-hexane extraction, the qualitative and quantitative analyses of alkylphenolic acids in Chinese patent medicineGBE (Ginkgo Bilobu Extract) were carried out with liquid chromatography-UV detector and mass spectrometry detector. Then-hexane was proven to be a very efficient extracting reagent, and few interfering materials were coextracted. Under the optimizedexperimental conditions, the recovery was 98.9%(n=5), the detection limit was 0.1μg/g, and the linear range was between 0.5~10μg/g for Ginkgo Biloba alkylphenolic acid of molecular weight of 346.厦门市科委夕阳红基金会资助项目(2000-1043

    天然抗氧化剂Isoverbascoside诱导人胃癌MGC 803细胞分化作用研究

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    人胃癌 MGC80 3细胞经天然抗氧化剂 Isoverbascoside(1sov)处理后 ,细胞生长和增殖呈现Isov浓度和处理时间依赖性抑制 ,群体倍增时间也相应延长 ;2 0 μmol/ L Isov处理可使细胞形态和超微结构发生正常化变化 ,集落形成率受抑 ;胃癌分化标志酶碱性磷酸酶和乳酸脱氢酶活性均呈时间依赖性下降 ,周期表现为 G1期阻滞 .表明 Isov具有诱导 MGC 80 3细胞分化的作用 ,并可能与细胞周期阻滞有

    EFFECT OF UNIT CELL VOLUME OF RE(Ni, Co, Mn, Ti)_5 ALLOY (RE=La, Ce, Pr, Nd) ON ITS ELECTROCHEMICAL PROPERTIES

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    制备了La(Ni,Co,Mn,Ti)5,Ce(Ni,Co,Mn,Ti)5,Pr(Ni,Co,Mn,Ti)5和Nd(Ni,Co,Mn,Ti)5四种单一稀土贮氢电极合金,分别测定了它们的单胞体积、氢化物生成焓和几个主要的电化学性能指标(包括活化循环次数、最大放电容量、高倍率放电率和容量衰退速率),以分析不同稀土元素对合金电化学性能的影响.结果表明,在四种合金中,单胞体积对合金的热力学性质和电化学性能起了决定性作用,它与合金的氢化物生成焓呈简单的线性关系,对电化学性能有双重影响,使四个主要指标随单胞体积的变化均出现极大或极小值.单胞体积本身的变化与稀土元素的周期性有关.Four rare earth based AB_5 typed alloys, La(Ni, Co, Mn, Ti)5, Ce(Ni, Co, Mn, Ti)5, Pr(Ni, Co, Mn, Ti)5 and Nd(Ni, Co, Mn, Ti)5, were prepared and then their unit cell volumes (Vcell), standard enthalpies of metal hydride formation at 298 K (△H298 K), and main electrochemical characteristics, such as activation cycle number (na), maximum discharge capacity at 50 mA/g charge/discharge rate (C50,max), high-rate-dischargeability K (includes K1 and K2 ), rate of decay (-dC / dn) were measured and analyzed to reveal the effects of the rare earth elements on the electrochemical properties. The results show that the unit cell volume is the key factor in determination of the alloys' thermodynamics and electrochemical properties. The standard enthalpies of metal hydride formation at 298 K (△H298 K) are proven to vary linearly with the unit cell volume, and the four electrochemical parameters, na, C50,max, -dC/dn and K,are dualistically affected by it. The change of unit cell volume is in accord with the periodic law of the rare earth element.国家自然科学基金!59801008;; 国家863高新技术计划资助!715-004-006

    厦门地区无偿献血者HEV隐性感染情况及基因型分析

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    目的了解厦门地区无偿献血者中戊型肝炎的感染情况。方法对2005年3月—2007年4月厦门地区20389人(次)无偿献血者做整群抽样,捕获法ElISA检测IgM抗-HEV、并对IgM抗-HEV阳性样本做HEVrT-PCr检测,经测序后分析其基因型及序列同源性。结果20389份无偿献血者血样本中,IgM抗-HEV阳性率为0.91%(186/20389);186例IgM抗-HEV阳性中有4例经rT-PCr检测为HEV阳性。献血者中病毒血症总阳性率为2/10000(4/20389),4例病毒血症中Ⅰ型与Ⅳ型感染各2例。结论厦门地区无偿献血者中,存在HEV隐性感染者。厦门市卫生局医学科研项目资助课题(编号:WSK0516
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