Internet image data

Preparation and transfer of queries for CAS database searches and capture of hits image display Internet connection to STN. Internet address stnc.cas.org (134,243.5.32). STN provides on-line access to many databases with chemical, physical, thermodynamic, toxicological, pharmaceutical, biomedical, and patent data. 12th Collective Index of Chemical Abstracts on CD-ROM. PCs and Macintosh. 

This provides much more flexibility, as the data objects returned by the object loader can be passed to other programs, such as those written in C, C++, Java Perl or Python, passed over the Internet via a CORBA server or used to create more interesting views, such as a view including an image made from data in the object (an example of this can be seen in Figure 1.11 further in this Chapter). 

Links. PDB s search engine, the Structme Explorer, can be used to retrieve PDB records, as shown in Figure 5.2. The Structure Explorer is also the primary database of links to third-party aimotation of PDB structure data. There are a number of links maintained in the Structure Explorer to Internet-based three-dimensional structure services on other Web sites. Figme 5.2 shows the Structure Summary for the protein bamase (IBNR Bycroft et al., 1991). The Structure Explorer also provides links to special project databases maintained by researchers interested in related topics, such as structural evolution (FSSP Holm and Sander, 1993), structure-structure similarity (DALI Holm and Sander, 1996), and protein motions (Gerstein et al., 1994). Links to visualization tool-ready versions of the structure are provided, as well as authored two-dimensional images that can be very helpful to see how to orient a three-dimensional structure for best viewing of certain features such as binding sites. 

Descriptions of the simplest data structure entities and explanations of their nature follow in succeeding sections. Basic data structures are stack, queue, and other linear lists multiple-dimension arrays (recursive) lists and trees (including forests and binary trees). Pointer or link simply means computer data constituting a memory location. Level indicates position in a structure that is hierarchical. Link, level, and the elementary structures are almost intuitive concepts. They are fairly easily understood by reference to their names or to real-life situations to which they relate. Evolving computer practice has had two effects. First, the impact of the World Wide Web and Internet browsers has acquainted many computer users with two basic ideas link (pointer) and level. Second, computer specialists have increased their use of advanced data structures. These may be understandable from their names or descriptive properties. Some of these terms are tries, quad-trees (quadtrees, quaternary trees), leftist-trees, 2-3 trees, binary search trees, and heap. While they are less common data structures and unlikely to be part of a first course in the field, they enable algorithmic procedures in applications such as image transmission, geographic data, and library search. 

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