The Stura FootPrint Screen plus MacroSol™ are available at this exceptionally low price when purchased together. 96 x 10 mL reagents.The FootPrint screens are based on the concept of screening the protein precipitant solubility curve to analyze the crystallization potential of proteins and their complexes.

The screens contain conditions at acidic, neutral and basic pH"s for polyethylene glycols and salts.

• Screens the protein precipitant solubility curve rather than a crystallization trial.
• Rapidly analyse the crystallization potential of your protein and protein complexes.
• Test the relative protein solubility with precipitants that have been used successfully in the crystallization of many proteins.
• Once initial crystals or crystalline aggregates are obtained from the initial screening, streak seeding is recommended to determine the ranges of conditions under which crystal growth can proceed.

References1. Stura E.A., Nemerow G.R., Wilson I.A (1992) Strategies in the crystallization of glycoproteiens and protein complexes. Journal of Crystal Growth 122:273-285.2. Stura E.A. (1999) Strategy 3: Reverse Screening. In "Crystallization of Proteins: Techniques, Strategies and Tips. A laboratory manual” (Bergfors T. ed.) International University Line pp113-124.3. Stura E.A, Satterthwait, A.C, Calvo, J.C, Kaslow, D.C, Wilson, I.A. (1994) Reverse Screening. Acta Cryst. D50 : 448-455.

Abstract  Quantum chemistry method was used to calculate the geometry structure of heavy oil character molecule. The method to calculate the minimum cross-sectional diameter of heavy oil character molecule and to show the molecular dimension was brought forward, which was used to predict the minimum cross-sectional diameter of some typical heavy oil character molecules. It is shown that the theory calculated result was consistent with experimental date. The minimum cross-sectional diameters of Daqing first cut (DQ-fcut) , middle cut (DQ-mcut) and end cut (DQ-endcut) were 1.8703, 3.0080 and 3.4929nm, respectively, meaning that these kinds of heavy oil molecules are too big to enter the sieve pore of zeolites, so they could be only cracked on the surface of zeolite. These research results can offer some useful theory basis to the selection and synthesis of zeolites.