Amber container

United Atom force fields are used often for biological polymers. In these molecules, a reduced number of explicit hydrogens can have a notable effect on the speed of the calculation. Both the BlO-t and OPUS force fields are United Atom force fields. AMBER contains both a United and an All Atom force field. 

The force field section (for example [amber]) contains four entries ... 

AgN03 (P) 169.89 Weigh the desired amount of ACS reagent grade AgNOg, dried at 105°C for 2 hr, and dissolve in double distilled water. Store in amber container and away from light. Check against NaCl. 

K4[Fe(CN)], 3H3O 422.41 Dissolve the high-purity commercial salt in distilled water containing 0.2 g/L of Na2C03. Kept in an amber container and away from direct sunlight, solutions are stable for a month or more. Standardize against zinc metal. 

Dissolve 1.000 g Au in 10 ml of hot HNO3 by dropwise addition of HCI, boil to expel oxides of nitrogen and chlorine, and dilute to volume. Store in amber container away from light. 

Extemporaneous oral suspension Grind four 500 mg oral tablets to a fine powder with a mortar and pestle. Add approximately 10 mL of cherry syrup to the powder and mix until smooth. Transfer the suspension to a graduated amber container. Use several small rinses of cherry syrup to transfer any remaining drug in the mortar to the final suspension for a final volume of 30 mL. The suspension of crushed tablets in artificial cherry syrup (Humco) is stable for 7 days at room temperature. When this suspension is used, shake well before each administration. 

As with drugs and purified biomarkers, thermal- and photostability of botanical products are the factors that must be considered. Commercial dried extract and capsules of SJW were evaluated under harmonized test conditions (25). Photostability testing showed all the constituents to be photosensitive in the tested conditions. However, different opacity agents and pigments influenced the stability of the constituents. Amber containers had little effect on the photostability of the investigated constituents. Long-term thermal stability testing showed a shelf life of less than four months for hyperforins and hypericins, even when ascorbic and citric acids were added to the formulation. 

Photoresist solution polymerizes in container - store in an amber container or a container wrapped with aluminum foil in a chemical refrigerator, if available. 

Amber consists basically of carbon, hydrogen and oxygen, with traces of other elements. Baltic amber contains a much hi er percentage of sucdnic add than any other amber and is therefore sometimes named sucdnite. (To some purists, only succinite is real amber. Other ambers, which contain no sucdnic add, are then called retinites .)... 

Some Mexican amber contains typical, almost parallel strata of dark debris (Fig. 1.11). 

Amber. Succinite Baltic amber Bernstein. A fossil resin from the extinct pine tree Pfnries succtnifera (Goepp.) Conway, Pinaceae. Found along the Baltic coast, also mined in Samland (East Prussia). Baltic amber contains C 79%. H 10.5%, O 10,5% succinic acid 3-8% a-amyrin 20-30%. Refi Plonait, Angew. Chem. 48, 184... 

The nnmba- and type of cross toms vary among different force fields. Thus, AMBER contains no cross terns, MM2 nses stretch-bend inteactions only and MM3 uses stretch-bend, bend-bend and stretch-torsion interactions. Cross terms are essential for an accurate reproduction of vibrational spectra and for a good treatment of strained molecular systems, but have only a small effect on conformational energies. 

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