| Frequently Asked Questions About PNAS Online | |||||
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The article you are looking for probably has not published yet. After
Monday at 5PM EST, journalists are allowed to report on all articles
expected to publish online that week in PNAS Early Edition. Because PNAS
publishes daily online, you may read about a PNAS article in the news
on Monday or Tuesday, but the article may not publish online until later
in the week. You can use the CiteTrack featurewww.pnas.org/help/citetrack to
set up an e-mail alert to notify you as soon as the article you are interested
in publishes. For more information about PNAS in the news, please e-mail
the PNAS communications department at pnasnews{at}nas.edu.
PNAS articles are published daily online before print at www.pnas.org in PNAS Early Edition. Papers are published online 1 to 5 weeks before they appear in print. The date a paper appears online in PNAS Early Edition is the publication date of record and is posted with the article text online.
Two types of free Email Alerts are available to all PNAS Online users:
To subscribe, change your email address, or unsubscribe yourself, see instructions on the contents awareness page.
Paid subscribers and National Academy of Sciences Members may access
the most recent research articles as well as commentaries, perspectives,
reviews, and papers published online before print in PNAS Early Edition.
Non-subscribers will continue to have free access to PNAS back issues (see
below), all tables of contents and abstracts, and will be able to search
the full text of all articles. For additional subscription information please see Subscriber Help & Services.
Yes, PNAS Online is freely and immediately available to more than 140 developing countries, including the following:
You may purchase a single article ($10) or purchase access to the site for 7 days ($25) by Visa or Mastercard from PNAS Online. Once you have selected an article you wish to access, a menu will appear on screen with ordering details. For older content not currently available at PNAS Online, you may obtain copies of articles from: Infotrieve Order Department, 10966 Le Conte Avenue, 2nd Floor, Los Angeles, CA 90024 USA. Fax 1-310-208-5971, phone 1-800- 422-4633 or 1-310-208-1903, e-mail order@infotrieve.com. Individual issues are available from Volume 99 (January 2002) to present. Volumes published prior to Volume 99 are out of print. Cost per issue: U.S. $40, non-U.S. $50. Price includes shipping. No discount allowed. For further information, please contact subs{at}aip.org or call 1-800-344-6902. To order, please use the form at http://www.pnas.org/subscriptions/issueorder.pdf.
Yes, click here to see the archive of PNAS Online issues dating back to 1990. Abstracts and tables of content are freely available dating back to 1915. In January 2002, PNAS established a policy of providing free access to back issues online, making PNAS content free -- at both the PubMed Central and PNAS Online web sites -- six months after print publication. Accordingly, PNAS research articles and papers published online before print in PNAS Early Edition are available only to paid subscribers for the first six months. All other articles dating to 1990 remain freely available, as are special features, colloquium papers, frontiers of science, supporting information, "This Week in PNAS", and "PNAS Classic Papers". The digital archive of issues older than 1990 is available through JSTOR (Journal Storage) to participating institutions at www.jstor.org. Presently, JSTOR coverage includes PNAS Vols. 1-97, 1915-2000.
Each regular print issue of PNAS Online will appear weekly on the Internet at noon Eastern Standard Time the same day as the print issue cover date (every Tuesday). For a list of cover dates, see About PNAS. The print issues of the journal are usually mailed to subscribers on the cover date, so PNAS Online will often be available well before subscribers receive their print copies, particularly for those outside the United States.
Yes, the print version of the journal will remain available by subscription.
Does it seem as if our home page and current issue never change? We publish new issues on the same schedule as the print edition. If you know that a new issue of the print journal has been published but don't see that issue appearing on the site you may be experiencing a caching problem. Please read "Is the journal getting stale?" for more information.
In some cases, author names containing accents and other diacritics and special characters are displayed incorrectly in the author index and table of contents. In these cases, the accented letters usually are dropped. Because these changes affect indexing of author names, you should avoid searching author names containing special characters until this problem is corrected.
The small pictures in the text of articles are called "thumbnails." They are supposed to be small enough to load quickly and large enough to get the general idea of what it is. (See the related question below.)
PNAS Online supports a two-step expansion of thumbnail images. Clicking on a thumbnail displays a larger version of a figure as well as the complete text of the figure's caption. You don't need any additional software to view this medium-size image. See Viewing Figures for more details.
This reflects a problem in the setup of your image viewer. Please see Help with High-Resolution Image Viewing.
We considered reducing image sizes, but we found that we were unable to maintain sufficient quality in smaller images.
See the instructions in PNAS Online Features.
Internet browsers are fairly capable image viewers, but not very capable image printers. However, we have available high-quality PDF versions of articles. See Help with Printing for more details.
We display a figure directly after the paragraph in which it is first mentioned. If an author chooses to label a figure "Figure 3" but refers to it in the text before Figures 1 or 2, the figures will appear out of order.
The tiny images are the only way for us currently to represent symbols that are not available in the standard HTML ISO-Latin-1 character set. However, HTML standards are being developed which will allow us to represent at least some of these symbols without the use of "inline images". As reliable browsers which support those standards become available, we'll use fewer inline images for symbols and special characters.
This could have two causes: either you have If you have enabled
If you are having trouble, please take a look at our Help with Searching page. [2/08] |
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