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Medium 9780596002763

3. JDO Architectures

David Jordan O'Reilly Media ePub

One of JDOs primary objectives is to provide you with a transparent, Java-centric view of persistent information stored in a wide variety of datastores. You can use the Java programming model to represent the data in your application domain and transparently retrieve and store this data from various systems, without needing to learn a new data-access language for each type of datastore. The JDO implementation provides the necessary mapping from your Java objects to the special datatypes and relationships of the underlying datastore. Chapter 4 discusses Java modeling capabilities you can use in your applications. This chapter provides a high-level overview of the architectural aspects of JDO, as well as examples of environments in which JDO can be used. We cannot enumerate all such environments in this book, because JDO is capable of running in a wide variety of architectures.

A JDO implementation is a collection of classes that implement the interfaces defined in the JDO specification. The implementation may be provided by an Enterprise Information System (EIS) vendor or a third-party vendor; in this context, we refer to both as JDO vendors. A JDO implementation provided by an EIS vendor will most likely be optimized for the specific EIS.

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Medium 9781588438195

Geography & Terrain

Barbara Rogers Hunter Publishing ePub

Border disputes have never been an issue among the four Atlantic provinces, where water separates them all (except for a tiny umbilical cord that holds Nova Scotia to New Brunswick). Although firmly attached to the continent on the west, where it borders both Maine and Qubec, New Brunswick has more coastal than land boundaries. In the three southern provinces, most of this coastline is bordered in beaches - miles of golden, red, gray and white sand. The waters of the Northumberland Strait are warm - New Brunswick has the warmest saltwater swimming north of Virginia - as are those off the beaches of Prince Edward Island and Nova Scotia. What Newfoundland and Labrador lack in beaches (the water there is not warm), they more than make up in breathtaking coastal scenery. 

Nova Scotia lies east and south of New Brunswick, with tiny Prince Edward Island off its northern shore, across the Northumberland Strait, which also separates it from New Brunswick. East and north of these lies Newfoundland, an island of many peninsulas, separated from Qubec and Labrador on the on the mainland by the narrow Strait of Belle Isle. Its closest point to the other Atlantic provinces is Cape Breton Island, a five-hour ferry ride away. Cape Breton Island itself lies off the northeast end of Nova Scotia, attached to it since the 1950s by a causeway. 

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Medium 9781449398262

1. Introducing Google App Engine

Dan Sanderson O'Reilly Media ePub

Google App Engine is a web application hosting service. By web application, we mean an application or service accessed over the Web, usually with a web browser: storefronts with shopping carts, social networking sites, multiplayer games, mobile applications, survey applications, project management, collaboration, publishing, and all the other things were discovering are good uses for the Web. App Engine can serve traditional website content too, such as documents and images, but the environment is especially designed for real-time dynamic applications.

In particular, Google App Engine is designed to host applications with many simultaneous users. When an application can serve many simultaneous users without degrading performance, we say it scales. Applications written for App Engine scale automatically. As more people use the application, App Engine allocates more resources for the application and manages the use of those resources. The application itself does not need to know anything about the resources it is using.

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Medium 9781780642635

3: Aspartate Aminotransferase

D'Mello, J.P.F. CABI PDF


Aspartate Aminotransferase

C.D. Leasure and Z.-H. He*

San Francisco State University, San Francisco, California, USA

3.1  Abstract

Aspartate aminotransferase (EC; AspAT) is present in all cellular life on the earth. It catalyses the removal of an amino group from an amino acid, followed by the subsequent amination of a keto acid, to create glutamate from aspartate or vice versa. AspAT is a vitamin B6-dependent enzyme that plays a pivotal role in carbon and

­nitrogen metabolism. While bacteria have only one AspAT isoenzyme, eukaryotic organisms have multiple isoenzymes that are located in different sub-cellular compartments. The structure of the AspAT enzyme was determined decades ago, and has since been refined. Most of this work was done using either the chicken (Gallus gallus), pig (Sus scrofa) or Escherichia coli versions of the enzyme. Many residues of the enzyme are 100% conserved and, as a convention, to make things comparable between species, they are numbered based on the pig version of the enzyme.

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Medium 9781591201434

3. Cordyceps sinensis

Stengler ND, Mark Basic Health Publications ePub


Cordyceps sinensis

Cordyceps sinensis is also called the “caterpillar fungus,” as it grows on and acquires nutrients from several species of caterpillars. In China, it is referred to as “winter worm, summer grass.” This fungus is found at high altitude in the mountains of China, Nepal, and Tibet.

Cordyceps attracted the attention of the general public and the health profession in 1993 when a group of Chinese runners broke nine world records in the World Outdoor Track and Field Championships in Germany. The coach of these Chinese athletes attributed those results to the athletes regular use of a Cordyceps-based tonic. Because Cordyceps helps increase stamina, energy levels, and endurance, it has become one of the top-selling sports supplements among the worlds’ elite competitive athletes.

In traditional Chinese medicine, C. sinensis is considered to benefit the lung and kidney channels. It is commonly used with the elderly in China as a type of “super-ginseng” for rejuvenation and stamina.

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