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磁镊是一种高精度的单分子技术，它用磁场对连有生物大分子的超顺磁球产生磁力，通过追踪磁球的位置来测量生物大分子的长度信息.磁镊包括横向磁镊和纵向磁镊.纵向磁镊空间精度高，但昂贵；横向磁镊简单便宜，但由于受其成像原理的限制，一般情况下只能连接较长的DNA等生物大分子，且其空间精度较差，进而限制了其应用范围.为了解决这个问题，本文改进了横向磁镊，用片层光照明的方法使光线主要被磁球散射，从而能够直接观察到吸附在样品槽侧壁上的磁球，这使得测量短连接的底物成为可能.对于实际应用的检测，首先测试了包含270 bp发卡结构的0.5 μm双链DNA，用其中发卡结构的“折叠-去折叠”跳变过程证明了改进后的横向磁镊的确可以追踪短DNA等生物大分子.然后，进一步用16 μm的λ-DNA检验了实验系统.最后，将新型横向磁镊与普通横向磁镊及纵向磁镊在小力和大力条件下拉伸不同长度DNA的噪声进行了比较，发现改进后的横向磁镊在空间精度上明显优于普通横向磁镊，与纵向磁镊相比也无明显差异.以上结果证明了改进后的横向磁镊的精度优势，并扩展了横向磁镊的应用范围.
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[2] Neuman K C, Nagy A 2008 Nat. Methods 5 491
[3] Wang S, Zheng H Z, Zhao Z Y, Lu Y, Xu C H 2013 Acta Phys. Sin. 62 168703 (in Chinese) [王爽, 郑海子, 赵振业, 陆越, 徐春华 2013 物理学报 62 168703]
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[21] Qi Z, Redding S, Lee J Y, Gibb B, Kwon Y, Niu H, Gaines W A, Sung P, Greene E C 2015 Cell 160 856
[22] Sun Y, Sato O, Ruhnow F, Arsenault M E, Ikebe M, Goldman Y E 2010 Nat. Struct. Mol. Biol. 17 485
[23] Lu H P, Xun L, Xie X S 1998 Science 282 1877
[24] Danilowicz C, Coljee V W, Bouzigues C, Lubensky D K, Nelson D R, Prentiss M 2003 Proc. Natl. Acad. Sci. USA 100 1694
[25] Smith S B, Finzi L, Bustamante C 1992 Science 258 1122
[26] Smith S B, Cui Y, Bustamante C 1996 Science 271 795
[27] Marko J F, Siggia E D 1995 Macromolecules 28 8759
[28] Wang X L, Zhang X H, Wei K J, Sun B, Li M 2008 Acta Phys. Sin. 57 3905 (in Chinese) [王晓玲, 张兴华, 魏孔吉, 孙博, 李明 2008 物理学报 57 3905]
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[31] Kim K, Saleh O A 2009 Nucleic Acids Res. 37 e136
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[33] Strick T R, Allemand J F, Bensimon D, Bensimon A, Croquette V 1996 Science 271 1835
[34] Abels J A, Moreno-Herrero F, van der Heijden T, Veenhuizen P T M, Bruinink M M, Dekker C, Dekker N H 2005 Biophys. J. 88 2737
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[1] Ha T, Enderle T, Ogletree D F, Chemla D S, Selvin P R, Weiss S 1996 Proc. Natl. Acad. Sci. USA 93 6264
[2] Neuman K C, Nagy A 2008 Nat. Methods 5 491
[3] Wang S, Zheng H Z, Zhao Z Y, Lu Y, Xu C H 2013 Acta Phys. Sin. 62 168703 (in Chinese) [王爽, 郑海子, 赵振业, 陆越, 徐春华 2013 物理学报 62 168703]
[4] Qian H, Chen H, Yan J 2016 Acta Phys. Sin. 65 188706 (in Chinese) [钱辉, 陈虎, 严洁 2016 物理学报 65 188706]
[5] Madariaga-Marcos J, Hormeno S, Pastrana C L, Fisher G L M, Dillingham M S, Moreno-Herrero F 2018 Nanoscale 10 4579
[6] Cheng W, Arunajadai S G, Moffitt J R, Tinoco I J, Bustamante C 2011 Science 333 1746
[7] Comstock M J, Whitley K D, Jia H, Sokoloski J, Lohman T M, Ha T, Chemla Y R 2015 Science 348 352
[8] Arslan S, Khafizov R, Thomas C D, Chemla Y R, Ha T 2015 Science 348 344
[9] Neupane K, Foster D A N, Dee D R, Yu H, Wang F, Woodside M T 2016 Science 352 239
[10] Righini M, Lee A, Canari-Chumpitaz C, Lionberger T, Gabizon R, Coello Y Tinoco I, Bustamante C 2018 Proc. Natl. Acad. Sci. USA 115 1286
[11] Sun B, Johnson D S, Patel G, Smith B Y, Pandey M, Patel S S, Wang M D 2011 Nature 478 132
[12] Yuan G, Le S, Yao M, Qian H, Zhou X, Yan J, Chen H 2017 Angew. Chem. Int. Edit. 56 5490
[13] Zhang X, Chen H, Fu H, Doyle P S, Yan J 2012 Proc. Natl. Acad. Sci. USA 109 8103
[14] Zhang X H, Chen H, Le S M, Rouzina I, Doyle P S, Yan J 2013 Proc. Natl. Acad. Sci. USA 110 3865
[15] Sun B, Wei K J, Zhang B, Zhang X H, Dou S X, Li M, Xi X G 2008 EMBO J. 27 3279
[16] Li W, Chen P, Yu J, Dong L, Liang D, Feng J, Yan J, Wang P Y, Li Q, Zhang Z, Li M, Li G 2016 Mol. Cell 64 120
[17] Lee C Y, Lou J Z, Wen K K, McKane M, Eskin S G, Ono S, Chien S, Rubenstein P A, Zhu C, McIntire L V 2013 Proc. Natl. Acad. Sci. USA 110 5022
[18] Lin W X, Ma J B, Nong D G, Xu C H, Zhang B, Li J H, Jia Q, Dou S X, Ye F F, Xi X G, Lu Y, Li M 2017 Phys. Rev. Lett. 119 138102
[19] Blosser T R, Yang J G, Stone M D, Narlikar G J, Zhuang X 2009 Nature 462 1022
[20] Yasuda R, Noji H, Kinosita K, Yoshida M 1998 Cell 93 1117
[21] Qi Z, Redding S, Lee J Y, Gibb B, Kwon Y, Niu H, Gaines W A, Sung P, Greene E C 2015 Cell 160 856
[22] Sun Y, Sato O, Ruhnow F, Arsenault M E, Ikebe M, Goldman Y E 2010 Nat. Struct. Mol. Biol. 17 485
[23] Lu H P, Xun L, Xie X S 1998 Science 282 1877
[24] Danilowicz C, Coljee V W, Bouzigues C, Lubensky D K, Nelson D R, Prentiss M 2003 Proc. Natl. Acad. Sci. USA 100 1694
[25] Smith S B, Finzi L, Bustamante C 1992 Science 258 1122
[26] Smith S B, Cui Y, Bustamante C 1996 Science 271 795
[27] Marko J F, Siggia E D 1995 Macromolecules 28 8759
[28] Wang X L, Zhang X H, Wei K J, Sun B, Li M 2008 Acta Phys. Sin. 57 3905 (in Chinese) [王晓玲, 张兴华, 魏孔吉, 孙博, 李明 2008 物理学报 57 3905]
[29] Sarkar R, Rybenkov V V 2016 Front. Phys. 4 48
[30] Li J H, Lin W X, Zhang B, Nong D G, Ju H P, Ma J B, Xu C H, Ye F F, Xi X G, Li M, Lu Y, Dou S X 2016 Nucleic Acids Res. 44 4330
[31] Kim K, Saleh O A 2009 Nucleic Acids Res. 37 e136
[32] Bosco A, Camunas-Soler J, Ritort F 2014 Nucleic Acids Res. 42 2064
[33] Strick T R, Allemand J F, Bensimon D, Bensimon A, Croquette V 1996 Science 271 1835
[34] Abels J A, Moreno-Herrero F, van der Heijden T, Veenhuizen P T M, Bruinink M M, Dekker C, Dekker N H 2005 Biophys. J. 88 2737
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