Storage method choice

The choice of storage method depends upon the production system such as frequency of harvest, demand, and end use. In countries where more than one crop is feasible, the storage period need not be long, e.g., 3-4 months. Another factor is to store the surplus in response to market demand at the time of harvest. Countries where only one crop is feasible, storage becomes... 

Transportation is by railroad tank vehicle, by tank truck, or by pipeline. In this case, transportation at ambient temperature is the best choice. The choice of storing ammonia at an ambient temperature liquid or partially refrigerated liquid or an ambient pressure liquid depends mostly on economic factors. One of the factors that determines the storage method is the quantity of ammonia to be stored. 

A. Of the above choices, SRAM would be the one to choose, as its storage method is to use a pattern of transistor ons and offs to represent the data. Because it s bulky and its storage method is inefficient, SRAM is not as popular anymore. 

Among the many candidates of hydrogen transportation or seasonal storage methods, the H2 evolution from cyclohexanes at the demand site and the reverse reaction, the hydrogenation of benzene, at the supply site offers the advantages of safe and commonly used transport at ambient temperature in chemical tank ships or trucks and mild reaction conditions. Cyclohexanes have a hydrogen density and content comparable with metal hydrides [8]. Methylcyclohexane is the choice of preference, since unlike benzene, toluene is not carcinogenic. 

Compounds that are radioactive can be located on a preparative layer by contact film autoradiography, electronic autoradiography, and storage phosphor screen imaging [21-23]. These methods differ in terms of factors such as simplicity, speed, sensitivity, and resolution, and the method of choice depends on the available equipment, reagents, and instrumentation. All are nondestructive, and the detected compounds can be recovered without change for later studies. 

Primary container-closure system-related data will need to cover storage, transportation, and use. The choice of materials of construction, their description, and the ability of the container-closure system to protect from moisture and/or light will need to be considered. The compatibility of the container-closure and its contents will need to consider sorption, leaching, and safety. The performance of the container-closure system will also need to be considered in terms of dose delivery from any associated device that is to be supplied as part of the product. Container-closure components will require adequate specifications covering description, identification, critical dimensional tolerances, and test methodology (including pharma-copeial and noncompendial methods). More data are likely to be required for liquid or semi-liquid products than for solid dosage forms. In the latter, product stability data and container-closure system specifications may suffice. 

Extraction or rather leaching of colourants is the first and a very important step in the analytical procedure for the analysis of natural dyes. The chemical composition of extracts from historical materials depends on many factors, such as the source of natural dyes, the technological procedure of their production, storage conditions over the centuries, ageing processes and extraction conditions. The choice of the extraction method depends on the properties of the components and the matrix from which they are isolated, as well as on the mechanism of dyeing with the particular dyestuff. In this regard, they are usually divided into three groups direct, vat and mordant dyestuffs. 

A typical instrument (Figure 13.6) will have a certain amount of memory for the storage of methods and data, and will offer a choice of several modes of titration, e.g. 

The selective electrophilic aromatic substitution carried out by displacement of a metallic substituent (Hg, Sn) ( F-fluorodemetallation) using [ F]p2 or [ F]AcOF remains a method of choice to introduce a fluorine atom on a specific position. In the early preparations of [6- F]fluoro-L-DOPA, the reaction of a 6-substituted mercuric derivative with [ F]acetyl hypofluorite yielded the expected compound in 11 % yield [73,74]. Reaction of a mercuric precursor, free or on a modified polystyrene support P-CH2-COOHg(DOPA precursor) allows the preparation of [ F]fluoro-L-DOPA in an overall yield up to 23 %. The polymer supports are easily prepared, require no special treatment for storage and are convenient to use in automated production [75]. 

Natural penicillin is fragile and breaks down in the presence of impurities and enzymes, having a half-life of just 2.5 h even when cooled to 0 °C. The method of choice for stabilizing penicillin for storage and shipment turned out to be the freeze-drying method. Penicillin is frozen in trays at —30 °C it is then placed in a chamber at a pressure of 0.1-0.6 Torr to sublimate the ice crystals into water vapor and removed. 

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