Results 81 to 90 of about 45,029 (132)

小鼠精子激活力减弱模型制备技术的初步研究

Zhongshan Daxue xuebao. Yixue kexue ban, 2013
【目的】：人类辅助生殖技术中，低受精率的发生机理及辅助激活提高受精率的安全性尚不清楚，缺乏激活力减弱的精子模型是其中一个主要研究障碍。本研究拟探索减弱小鼠精子激活力的新技术。【方法】 首先，分别对精子进行化学破膜、机械脱尾及其联合操作于３７ ℃ 孵育１２ ｈ，比较各操作对显微授精后的受精率的影响；然后进一步结合时间因素，观察处理时间与精子激活力减弱程度的联系。同时，对操作后的胚胎早期发育的影响也进行了相应观察。【结果】 ①化学破膜法与机械脱尾法对精子破膜并温育后，均能有效降低精子受精率 ...
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[Determination of 65 synthetic cannabinoids in whole blood by QuEChERS-ultra performance liquid chromatography- mass spectrometry]. [PDF]

Se Pu
Xi Z, Ye Y, Li SP, Kang J, Liu WQ, Zhang J, Li DX.   +6 more
europepmc   +1 more source

[Performance validation and consistency assessment of three liquid chromatography-tandem mass spectrometry methods for detecting fat-soluble vitamins]. [PDF]

Se Pu
Li BC, Li BH, Chen ZY, Li ZY, Yin ML, Lyu X, Xiang ZY, Long QC, Hu M.   +8 more
europepmc   +1 more source

[Determination of ergot alkaloids toxins in forage grass by ultra performance liquid chromatography-tandem mass spectrometry coupled with solid-phase supported liquid-liquid extraction]. [PDF]

Se Pu
Ren CX, Wang XM, Sheng WL, Han YZ, Zhang CY, Zheng SZ.   +5 more
europepmc   +1 more source

[Self-designed experiment in instrumental analysis： online solid phase extraction-high performance liquid chromatography- post column derivatization for the determination of trace pesticide residues in vegetables]. [PDF]

Se Pu
Li Y, Liu YT, Huang X, Zhou ZY, Wang ZQ, Wang J, Ding F, Nan J, Tang A.   +8 more
europepmc   +1 more source

[Double-layer ceramic technique for restoring severely discolored nonvital maxillary anterior teeth: a case report]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Chen J, Yin L.
europepmc   +1 more source

[Simultaneous Analysis of Microcystins, Cylindrospermopsin, Anatoxin, and Nodularin in Lake Water by Liquid Chromatography-Tandem Mass Spectrometry]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Yuan G, Luo Q, Liu G, Qin X, Liu H, Lü Z, Jiang J.   +6 more
europepmc   +1 more source

[Development of a machine learning-based ionization efficiency prediction model for per- and polyfluoroalkyl substances and its application in semi-quantitative analysis]. [PDF]

Se Pu
Sun SZ, Li YY, Gao Y, Li KC, Chen Z, Li XQ, Zhang QH.   +6 more
europepmc   +1 more source

[Development of an LC-MS/MS method for 32 steroid hormones and exploration of their gestational variations]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Zhou Q, Chen J, Nie C, Wang Q, Xia F, Zhou H.   +5 more
europepmc   +1 more source

[Determination of vitamin D and 25-hydroxyvitamin D in animal-derived foods by derivatization-ultra performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Liu Y, Xie JH, Zhang PP, Zhou D, Zhao WK, Zhang JZ.   +5 more
europepmc   +1 more source