+++3 статьи из ScienceDirect и 1 Nature

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Помогите пожалуйста найти 4 статьи:

1. AUTHORS: Lars Sundberg, Jerker Porath
TITLE: Preparation of adsorbents for biospecific affinity chromatography : I. Attachment of group-containing ligands to insoluble polymers by means of bifunctional oxiranes
JOURNAL: Journal of Chromatography A, Volume 90, Issue 1, 13 March 1974, Pages 87-98

DOI:

http://dx.doi.org/10.1016/S0021-9673(01)94777-6

2. AUTHORS: JERKER PORATH, JAN CARLSSON, INGMAR OLSSON, GRETA BELFRAGE
TITLE: Metal chelate affinity chromatography, a new approach to protein fractionation
JOURNAL: Nature 258, 598-599 (18 December 1975)

DOI:

http://dx.doi.org/10.1038/258598a0

3. AUTHORS: Erich Hochuli, Susan Piesecki
TITLE: Interaction of hexahistidine fusion proteins with nitrilotriacetic acid-chelated Ni2+ ions
JOURNAL: Methods, Volume 4, Issue 1, 1992, Pages 68-72

DOI:

http://dx.doi.org/10.1016/1046-2023(92)90057-F

4. AUTHORS: Shu-Juan LI, Yong-Liang SUN, Dao-Dao HU, Chao CHEN, and Ya-Li CUI
TITLE: Preparation of Metal Chelate Affinity Chromatographic Medium and Its Application in the Purification of 6x Histidine-tagged Protein
JOURNAL: Chinese Journal of Biotechnology, Volume 23, Issue 5, September 2007, Pages 941-946

DOI:

http://dx.doi.org/10.1016/S1872-2075(07)60057-0

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