Resource Internet

Introduction to Microscale High-Performance Liquid Chromatography, VCH Publishers Inc., New York, 1988. 

Tanaka, H. Kobayashi, K. Nakanishi, H. Minakuchi, and N. Ishizuka, Anal. Chem., 73,420A (2001). 

Aboul-Enein and I. Ali, Chiral Separations by Liquid Chromatography Theory and Applications (Chromatographic Science, Volume 90), Marcel Dekker, New York, 2003. 

Modern HPLC for Practicing Scientists, by Michael W. Dong Copyright 2006 John Wiley Sons, Inc. 

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Trougott Koch, Browsing and searching Internet resources, http // WWW ub21u.se/n avmenu. ht ml... 

Metadatabases are databases which describe other databases in a comprehensive and stnretured way [51], A prominent example is the DAIN Metadatabase of Internet Resources for Environmental Chemicals kctp //wwMmz.uni-ka el.de/dain) which in 2002 comprised more than 700 entries. This metadatabase is documented in Chapter V, Section 10 of the Handbook, on Databa.scs on Enviromnental Information", It supports the user in finding the right database(s) for their purposes. 

A third Internet resource is www.mathleague.com/help/help.htm. From this page, click on either using data and statistics, or percent and probability. 

Quality control is performed at the moment of data entry, in particular, with respect to errors present in publications. Chemical structures are checked for structural consistency by matching the molecular weight (MW) and chemical formula with the ones available in the experimental section and/or supporting information - whenever available, and by comparison to prior publications. Whenever in doubt, we also use other sources, such as the Merck Index [20] and free Internet resources. In the instances... 

Internet Resource URL/Source Specification of Data and Information Available... 

Type the name of a program, folder, document, or — Internet resource, and Windows will open it for you. 

Your ability to manage people, stay cool under pressure, remain organized, use Internet resources or software applications (such as Microsoft Office), speak in public, communicate well in writing, communicate in multiple languages, or perform research are all examples of marketable skills. 

Boston University Library. Research Guides Drug Abuse. Boston University Library. Available online. URL htqi //www.bu.edu/library/guides/ drugabuse.html. Updated December 9, 2003. Provides a useful list of subject headings, indexes, databases, statistics, and Internet resources on topics relating to drug abuse. 

This unit will introduce two fundamental protocols—the Wilhelmy plate method (see Basic Protocol 1 and Alternate Protocol 1) and the du Noiiy ring method (see Alternate Protocol 2)—that can be used to determine static interfacial tension (Dukhin et al., 1995). Since the two methods use the same experimental setup, they will be discussed together. Two advanced protocols that have the capability to determine dynamic interfacial tension—the drop volume technique (see Basic Protocol 2) and the drop shape method (see Alternate Protocol 3)—will also be presented. The basic principles of each of these techniques will be briefly outlined in the Background Information. Critical Parameters as well as Time Considerations for the different tests will be discussed. References and Internet Resources are listed to provide a more in-depth understanding of each of these techniques and allow the reader to contact commercial vendors to obtain information about costs and availability of surface science instrumentation. 

The main advantage of the static methods is cost. The equipment needed to conduct the dynamic measurements is approximately five times as expensive as the equipment required for static measurements (- 25,000 for a drop shape and drop volume analyzer versus - 5,000 for du Noiiy and Wilhelmy instruments). This is due to the additional capability of the former instruments to determine not only interfacial tension values but also the corresponding age of the interface. For more information on equipment, costs, and suppliers, see Internet Resources. 

An almost overwhelmingly large number of different techniques for measuring dynamic and static interfacial tension at liquid interfaces is available. Since many of the commercially available instruments are fairly expensive to purchase (see Internet Resources), the appropriate selection of a suitable technique for the desired application is essential. Dukhin et al. (1995) provides a comprehensive overview of currently available measurement methods (also see Table D3.6.1). An important aspect to consider is the time range over which the adsorption kinetics of surface-active substances can be measured (Fig. D3.6.5). For applications in which small surfactant molecules are primarily used, the maximum bubble pressure (MBP) method is ideally suited, since it is the only... 

It is highly recommended that all retention properties be normalized to one or preferably several reference standards. Retention indexing, first described by Kovats (Kovats, 1965 see Support Protocol), is by far the most useful standardization procedure for aroma chemicals, because there are published databases (see Internet Resources) listing hundreds of aroma chemicals including their Kovats indices on several substrates. 

Use a data base of retention indices (e.g., the Flavomet see Internet Resources) to tentatively identify each peak. 

Figure G1.5.7 Typical gas chromatogram for cold-pressed orange oil. Reproduced with permission from Agilent Technologies, Inc. (see Internet Resources).

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