That’s because the book was designed to be digital-only. Students will pay not for a printed edition at a bookstore, but for permanent access on the Internet ($49).

And when they open the book on their laptops, tablets and smartphones, they will find other differences, too. True, the text is packed densely with definitions and diagrams — it is meant to teach college-level science, after all, and is from the publishers of the august journal Nature.

Still, this isn’t your usual technical tome. The pages have some pizazz: they are replete with punchy, interactive electronic features — from dynamic illustrations to short quizzes meant to involve students rather than letting them plod, glassy-eyed, from one section to the next. Audio and video clips are woven into the text.

“We want to take advantage of the things only digital media can do, and that are superior to print, to broaden the ways students learn science,” said Vikram Savkar, senior vice president and publishing director at Nature Publishing. “We want students to measure a chapter not by how much they read, but by how much they learn.”

The book offers many dynamic, interactive illustrations. As students learn about the genetic code, for example, they can match amino acids to corresponding sequences on the double helix to understand how an entire protein emerges from genetic sequences.

Midway through a chapter, some interactive elements will quiz students on what they have just read — and provide hints and pointers when their answers are incorrect.

“Principles of Biology,” Mr. Savkar’s brainchild, was two years in the making. A Harvard graduate with degrees in physics and classics, he wanted to move beyond early e-textbooks that were essentially static electronic reprises of the print versions.

Most science e-books “are still PDFs of print books that are scanned and put online,” he said. (A PDF format preserves the original appearance of a page when it is viewed electronically.)

“But if the best way to learn is to see something moving, we teach that through a piece of interactive media, integrated right into the text,” he said. “If a quiz is the best way, we do that.”

Nature Publishing, a division of Macmillan Publishers, chose to make the browser central to the textbook, rather than creating individual apps for students to use on electronic devices — an expensive procedure that might require as many as 20 versions, Mr. Savkar said. Instead, the Web site senses which device a student is using, say a laptop or a tablet, and delivers the appropriate format to the browser.

“This is a world where students have many devices, and they expect to have whatever they need when they need it,” he said. “But no matter what device they go to, the browser is there, and therefore our textbook is there, too.” For offline use, students can download a digital edition to read on a desktop. They can also print copies if they prefer a paper version.

The biology text, tested this past year at some campuses of California State University, is the first of a series of digital textbooks planned by the company.

OTHER publishers are also experimenting with technologies that enliven the static pages of electronic technical textbooks and documents. This summer, Wolfram Research, known for its computing software Mathematica and its Web search tool Wolfram Alpha, introduced a new format as well as a free player with a built-in math engine. (The player can be downloaded at wolfram.com/cdf-player.)

The format allows for routine use of interactive illustrations. With them, readers can change a problem’s parameters and watch as the illustration recomputes and re-forms accordingly. On an image of an oil slick, for example, you might move the contour outline to a point where the slick has a given thickness, or superimpose a photographic view over a computed one.

At Walla Walla Community College in Washington, Eric Schulz, who teaches mathematics, used Wolfram’s tools to create an interactive, digital version of the textbook “Calculus,” written by William Briggs and Lyle Cochran and published by Pearson. Students can manipulate 650 interactive figures, including graphs of functions, derivatives, and integrals, as they learn the basics of calculus.

Conrad Wolfram, strategic director and European co-founder at Wolfram, says he hopes the company’s technology will be used not only in textbooks, but also in business reports and journal papers. “You can add this dynamic content without hiring a host of programmers to create interactivity,” he said.

The interactive tools can already be seen in some entries at Wolfram Alpha, the search site. For example, after downloading the player, enter “double pendulum” in the search bar or “binarize Lady Gaga photo with threshold x” and watch as live calculations change the double pendulum’s movement when the string is shorter or the load heavier, or change the image of Lady Gaga as it is binarized — or changed from an analog to a digital image with two choices of pixels.

If such illustrations provide a better understanding of terms like “binarize” or “double pendulum,” they’ve done their work — and maybe we’ll soon see more of them in electronic textbooks, papers and company reports.

E-mail: novelties@nytimes.com.

Article source: http://www.nytimes.com/2011/12/18/business/online-textbooks-aim-to-make-science-leap-from-the-page.html?partner=rss&emc=rss