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pnas.org

Website review pnas.org

 Generated on November 07 2016 04:58 AM

Old statistics? UPDATE !


The score is 45/100

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SEO Content
Title

Proceedings of the National Academy of Sciences



Length : 47

Perfect, your title contains between 10 and 70 characters.
Description



Length : 0

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Keywords



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Og Meta Properties This page does not take advantage of Og Properties. This tags allows social crawler's better structurize your page. Use this free og properties generator to create them.
Headings
H1 H2 H3 H4 H5 H6
0 6 8 0 0 0
  • [H2] Current Issue
  • [H2] Early Edition
  • [H2] PNAS Science Sessions
  • [H2] Featured Image
  • [H2] Front Matter
  • [H2] PNAS in the News
  • [H3] From the Cover
  • [H3] Honeybees and biofuel crops
  • [H3] Ground squirrel
  • [H3] PNAS Direct to Your Inbox
  • [H3] PNAS Portals
  • [H3] PNAS Magazine Section and Blog
  • [H3] Top Articles
  • [H3] Follow PNAS on Facebook
Images We found 23 images on this web page.

1 alt attributes are empty or missing. Add alternative text so that search engines can better understand the content of your images.
Text/HTML Ratio Ratio : 59%

Ideal! This page's ratio of text to HTML code is between 25 and 70 percent.
Flash Perfect, no Flash content has been detected on this page.
Iframe Great, there are no Iframes detected on this page.

URL Rewrite Bad. Your links have query string.
Underscores in the URLs We have detected underscores in your URLs. You should rather use hyphens to optimize your SEO.
In-page links We found a total of 120 links including 8 link(s) to files



Anchor Type Juice
Contact Internal Passing Juice
Feedback Internal Passing Juice
Submit External Passing Juice
Subscribe Internal Passing Juice
Advanced Search » Internal Passing Juice
Skip to main page content Internal Passing Juice
Current Issue Internal Passing Juice
Archive Internal Passing Juice
News & Multimedia Internal Passing Juice
Authors Internal Passing Juice
About Internal Passing Juice
Collected Articles Internal Passing Juice
Colloquium Papers Internal Passing Juice
Commentaries Internal Passing Juice
Core Concepts Internal Passing Juice
Cozzarelli Prize Internal Passing Juice
Editorials Internal Passing Juice
Feature Articles Internal Passing Juice
Front Matter Internal Passing Juice
Inaugural Articles Internal Passing Juice
In This Issue Internal Passing Juice
Inner Workings Internal Passing Juice
Letters and Replies Internal Passing Juice
News Features Internal Passing Juice
Opinions Internal Passing Juice
Perspectives Internal Passing Juice
PNAS Classics Internal Passing Juice
PNAS Plus Internal Passing Juice
PNAS Portals Internal Passing Juice
Profiles Internal Passing Juice
QnAs Internal Passing Juice
Retrospectives Internal Passing Juice
Science and Culture Internal Passing Juice
Significance Statements Internal Passing Juice
Special Features Internal Passing Juice
Sustainability Science Internal Passing Juice
Agricultural Sciences Internal Passing Juice
Anthropology Internal Passing Juice
Applied Biological Sciences Internal Passing Juice
Applied Mathematics Internal Passing Juice
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Biophysics and Computational Biology Internal Passing Juice
Cell Biology Internal Passing Juice
Chemistry Internal Passing Juice
Computer Sciences Internal Passing Juice
Developmental Biology Internal Passing Juice
Earth, Atmospheric, and Planetary Sciences Internal Passing Juice
Ecology Internal Passing Juice
Economic Sciences Internal Passing Juice
Engineering Internal Passing Juice
Environmental Sciences Internal Passing Juice
Evolution Internal Passing Juice
Genetics Internal Passing Juice
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Immunology and Inflammation Internal Passing Juice
Mathematics Internal Passing Juice
Medical Sciences Internal Passing Juice
Microbiology Internal Passing Juice
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Pharmacology Internal Passing Juice
Physics Internal Passing Juice
Physiology Internal Passing Juice
Plant Biology Internal Passing Juice
Political Sciences Internal Passing Juice
Population Biology Internal Passing Juice
Psychological and Cognitive Sciences Internal Passing Juice
Social Sciences Internal Passing Juice
Statistics Internal Passing Juice
Systems Biology Internal Passing Juice
Early Edition Internal Passing Juice
Highlights from Early Edition Internal Passing Juice
About this image Internal Passing Juice
Science Sessions Podcast: Clint Otto discusses the impact of land-use changes on beekeepers in the Dakotas. Internal Passing Juice
Early warning signals of regime shifts in coupled human–environment systems Internal Passing Juice
Highly selective inhibition of myosin motors provides the basis of potential therapeutic application Internal Passing Juice
Cross-linking reveals laminin coiled-coil architecture Internal Passing Juice
Control of inflammation by stromal Hedgehog pathway activation restrains colitis Internal Passing Juice
Seymour J. Klebanoff: Discoverer of WBC killing mechanisms Internal Passing Juice
Divergence of ectodermal and mesodermal gene regulatory network linkages in early development of sea urchins Internal Passing Juice
PNAS Science Sessions Internal Passing Juice
Subscribe » External Passing Juice
Past Podcasts » Internal Passing Juice
Listen » Internal Passing Juice
Featured Image Internal Passing Juice
Image Gallery » Internal Passing Juice
Front Matter Internal Passing Juice
Opinion: India faces a long and winding path to green climate solutions Internal Passing Juice
Science and Culture: Avant-garde outreach, with science rigor Internal Passing Juice
Core Concept: Chimeras keep courting controversy Internal Passing Juice
PNAS in the News Internal Passing Juice
New & Newsworthy » Internal Passing Juice
For the Press » Internal Passing Juice
How chilling leaches flavor from tomatoes Internal Passing Juice
Childhood adversity and adult cellular aging Internal Passing Juice
Forest fires and climate change Internal Passing Juice
PNAS Direct to Your Inbox Internal Passing Juice
Customize your PNAS emails Internal Passing Juice
Subject specific Internal Passing Juice
Keyword specific Internal Passing Juice
Classics External Passing Juice
Teaching Resources Internal Passing Juice
Anthropology Internal Passing Juice
Blog Internal Passing Juice
Opinion: Science in the age of selfies Internal Passing Juice
Metabolic features of chronic fatigue syndrome Internal Passing Juice
Cluster failure: Why fMRI inferences for spatial extent have inflated false-positive rates Internal Passing Juice
Analysis and valuation of the health and climate change cobenefits of dietary change Internal Passing Juice
Neural correlates of the LSD experience revealed by multimodal neuroimaging Internal Passing Juice
Follow PNAS on Facebook External Passing Juice
HighWire Press® External Passing Juice
Glencoe Software, Inc External Passing Juice
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http://intl.pnas.org Internal Passing Juice

SEO Keywords
Keywords Cloud early edition science sciences climate biology from image articles pnas
Keywords Consistency
Keyword Content Title Keywords Description Headings
pnas 14
science 13
sciences 13
early 8
articles 6

Usability
Url Domain : pnas.org
Length : 8
Favicon Great, your website has a favicon.
Printability We could not find a Print-Friendly CSS.
Language Good. Your declared language is en.
Dublin Core This page does not take advantage of Dublin Core.

Document
Doctype XHTML 1.0 Strict
Encoding Perfect. Your declared charset is UTF-8.
W3C Validity Errors : 25
Warnings : 3
Email Privacy Great no email address has been found in plain text!
Deprecated HTML Great! We haven't found deprecated HTML tags in your HTML.
Speed Tips
Excellent, your website doesn't use nested tables.
Too bad, your website is using inline styles.
Too bad, your website has too many CSS files (more than 4).
Too bad, your website has too many JS files (more than 6).
Perfect, your website takes advantage of gzip.

Mobile
Mobile Optimization
Apple Icon
Meta Viewport Tag
Flash content

Optimization
XML Sitemap Missing

Your website does not have an XML sitemap - this can be problematic.

A sitemap lists URLs that are available for crawling and can include additional information like your site's latest updates, frequency of changes and importance of the URLs. This allows search engines to crawl the site more intelligently.
Robots.txt http://pnas.org/robots.txt

Great, your website has a robots.txt file.
Analytics Great, your website has an analytics tool.

   Google Analytics

PageSpeed Insights

59 / 100    Speed
  Should Fix:
Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.

Avoid landing page redirects for the following chain of redirected URLs.

  • http://pnas.org/
  • http://www.pnas.org/
  • http://m.pnas.org/
Show how to fix
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 3 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

Remove render-blocking JavaScript:

  • http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js
  • http://pnas-movie.glencoesoftware.com/static/video_inline.min.js
  • http://m.pnas.org/files/js/js_00e98cac99853cad84601619385ecebd.js

Optimize CSS Delivery of the following:

  • http://pnas-movie.glencoesoftware.com/static/video-js.min.css
  • http://m.pnas.org/files/css/css_32e8684e2f0675dea75986bddf87e134.css
Show how to fix
  Consider Fixing:
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

  • http://m.pnas.org/webfm_send/6 (expiration not specified)
  • http://pnas-movie.glencoesoftware.com/static/video-js.min.css (expiration not specified)
  • http://pnas-movie.glencoesoftware.com/static/video_inline.min.js (expiration not specified)
  • http://m.pnas.org/content/113/44.cover.gif (59 minutes)
  • http://www.google-analytics.com/ga.js (2 hours)
Show how to fix
Minify JavaScript
Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 3.2KiB (15% reduction).

  • Minifying http://m.pnas.org/files/js/js_00e98cac99853cad84601619385ecebd.js could save 3.2KiB (15% reduction) after compression.
Show how to fix
Optimize images
Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 62.6KiB (71% reduction).

  • Compressing http://m.pnas.org/sites/all/themes/highwire/hwmobile_a/img/arrow.png could save 50.7KiB (99% reduction).
  • Compressing http://m.pnas.org/webfm_send/6 could save 7.7KiB (47% reduction).
  • Compressing http://m.pnas.org/sites/all/themes/highwire/hwmobile_a/img/icons.png could save 2.7KiB (50% reduction).
  • Compressing http://m.pnas.org/content/113/44.cover.gif could save 1.5KiB (11% reduction).
Show how to fix
  4 Passed Rules
Show details
Enable compression

You have compression enabled. Learn more about enabling compression.

Minify CSS

Your CSS is minified. Learn more about minifying CSS.

Minify HTML

Your HTML is minified. Learn more about minifying HTML.

Prioritize visible content

You have the above-the-fold content properly prioritized. Learn more about prioritizing visible content.

99 / 100    User Experience
  Consider Fixing:
Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

  • The tap target <a href="/help">Help Pages</a> and 1 others are close to other tap targets final.
Show how to fix
  4 Passed Rules
Show details
Avoid plugins

Your page does not appear to use plugins, which would prevent content from being usable on many platforms. Learn more about the importance of avoiding plugins.

Configure the viewport

Your page specifies a viewport matching the device's size, which allows it to render properly on all devices. Learn more about configuring viewports.

Size content to viewport

The contents of your page fit within the viewport. Learn more about sizing content to the viewport.

Use legible font sizes

The text on your page is legible. Learn more about using legible font sizes.

61 / 100    Speed
  Should Fix:
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

  • http://pnas-movie.glencoesoftware.com/static/video-js.min.css (expiration not specified)
  • http://pnas-movie.glencoesoftware.com/static/video_inline.min.js (expiration not specified)
  • http://www.pnas.org/local/img/nav/background-expand-lg.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/footer-pnas.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/glencoe_logo_small.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/headline.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/icon-highwire.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/icon-nas.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/nav-article-bg.png (expiration not specified)
  • http://www.pnas.org/local/img/nav/nav-divider2.png (expiration not specified)
  • http://www.pnas.org/local/js/expand.js (expiration not specified)
  • http://www.pnas.org/local/js/hw-local-global.js (expiration not specified)
  • http://www.pnas.org/local/js/hw-local-js-settings.js (expiration not specified)
  • http://www.pnas.org/local/js/jquery-1.7.2.min.js (expiration not specified)
  • http://www.pnas.org/local/js/jquery.tabify.js (expiration not specified)
  • http://www.pnas.org/local/js/jquery.ui.widget.min.js (expiration not specified)
  • http://www.pnas.org/local/js/modernizr.js (expiration not specified)
  • http://www.pnas.org/local/js/pages/pnas-home.js (expiration not specified)
  • http://www.pnas.org/local/js/script.js (expiration not specified)
  • http://www.pnas.org/shared/js/design/hw-design1.js (expiration not specified)
  • http://www.pnas.org/shared/js/fingerprint.js (expiration not specified)
  • http://www.pnas.org/shared/js/hw-shared.js (expiration not specified)
  • http://www.pnas.org/site/misc/images/16-04269.292.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_CBSNews.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_NPR.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_NYTimes.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_TheScientist.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_Time.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/Icon_WashingtonPost.png (expiration not specified)
  • http://www.pnas.org/site/misc/images/cellular-home.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/child-home.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/clintOttoPodcastImage-HomePage.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/forestfire-home.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/guerilla-home.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/india-home.jpg (expiration not specified)
  • http://www.pnas.org/site/misc/images/tomatoes-home.jpg (expiration not specified)
  • https://d1bxh8uas1mnw7.cloudfront.net/assets/embed.js (expiration not specified)
  • https://d1uo4w7k31k5mn.cloudfront.net/donut/0.png (expiration not specified)
  • http://www.pnas.org/content/113/44/local/cover-banner.jpg (2 minutes)
  • http://connect.facebook.net/en_US/all.js (20 minutes)
  • http://www.pnas.org/local/css/hw-local-global-overrides.css (60 minutes)
  • http://www.pnas.org/local/css/hw-local-global-pages.css (60 minutes)
  • http://www.pnas.org/local/css/hw-local-global.css (60 minutes)
  • http://www.pnas.org/local/css/hw-local-home.css (60 minutes)
  • http://www.pnas.org/local/css/hw-local-sidebar.css (60 minutes)
  • http://www.pnas.org/local/img/misc/arrow-green.gif (60 minutes)
  • http://www.pnas.org/local/img/misc/arrow-white.gif (60 minutes)
  • http://www.pnas.org/local/img/misc/btn-go.gif (60 minutes)
  • http://www.pnas.org/local/img/misc/rss.gif (60 minutes)
  • http://www.pnas.org/local/img/nav/btn-search.gif (60 minutes)
  • http://www.pnas.org/local/img/nav/pnas-header-logo.gif (60 minutes)
  • http://www.pnas.org/local/img/sidebar/square.gif (60 minutes)
  • http://www.pnas.org/shared/css/hw-global-citation.css (60 minutes)
  • http://www.pnas.org/shared/css/hw-global-classes.css (60 minutes)
  • http://www.pnas.org/shared/css/hw-global-dynamic-elements.css (60 minutes)
  • http://www.pnas.org/shared/css/hw-global-elements.css (60 minutes)
  • http://www.pnas.org/shared/css/hw-global-sidebars.css (60 minutes)
  • http://www.pnas.org/shared/css/hw-global.css (60 minutes)
  • http://www.pnas.org/shared/css/standard-designs/design25/d25-page-home.css (60 minutes)
  • http://www.pnas.org/shared/css/standard-designs/design25/d25-sidebar.css (60 minutes)
  • http://www.pnas.org/shared/css/standard-designs/design25/main.css (60 minutes)
  • http://www.pnas.org/shared/css/standard-designs/design25/ui.css (60 minutes)
  • http://www.pnas.org/site/css/global_styles.css (60 minutes)
  • http://www.pnas.org/site/css/main.css (60 minutes)
  • http://www.pnas.org/site/misc/images/includeimages/sessions-overlay-lg.gif (60 minutes)
  • http://www.google-analytics.com/ga.js (2 hours)
Show how to fix
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 14 blocking script resources and 22 blocking CSS resources. This causes a delay in rendering your page.

None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

Remove render-blocking JavaScript:

  • http://www.pnas.org/local/js/jquery-1.7.2.min.js
  • http://www.pnas.org/local/js/jquery.ui.widget.min.js
  • http://www.pnas.org/local/js/modernizr.js
  • http://www.pnas.org/shared/js/fingerprint.js
  • http://www.pnas.org/shared/js/hw-shared.js
  • http://www.pnas.org/local/js/hw-local-js-settings.js
  • http://www.pnas.org/local/js/jquery.tabify.js
  • http://www.pnas.org/local/js/hw-local-global.js
  • http://www.pnas.org/local/js/expand.js
  • http://www.pnas.org/local/js/script.js
  • http://www.pnas.org/shared/js/design/hw-design1.js
  • http://pnas-movie.glencoesoftware.com/static/video_inline.min.js
  • http://www.pnas.org/local/js/pages/pnas-home.js
  • http://connect.facebook.net/en_US/all.js

Optimize CSS Delivery of the following:

  • http://www.pnas.org/shared/css/hw-global.css
  • http://www.pnas.org/shared/css/hw-global-sidebars.css
  • http://www.pnas.org/shared/css/hw-global-elements.css
  • http://www.pnas.org/shared/css/hw-global-citation.css
  • http://www.pnas.org/shared/css/hw-global-classes.css
  • http://www.pnas.org/shared/css/hw-global-dynamic-elements.css
  • http://www.pnas.org/shared/css/standard-designs/design25/main.css
  • http://www.pnas.org/shared/css/standard-designs/design25/ui.css
  • http://www.pnas.org/shared/css/standard-designs/design25/d25-page-home.css
  • http://www.pnas.org/shared/css/standard-designs/design25/d25-sidebar.css
  • http://www.pnas.org/local/css/hw-local-global.css
  • http://www.pnas.org/local/css/hw-local-global-overrides.css
  • http://www.pnas.org/local/css/hw-local-global-pages.css
  • http://fonts.googleapis.com/css?family=Open+Sans:400,700,600
  • http://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700
  • http://www.pnas.org/local/css/hw-local-sidebar.css
  • http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css
  • http://pnas-movie.glencoesoftware.com/static/video-js.min.css
  • http://www.pnas.org/shared/css/standard-designs/design25/d25-page-home.css
  • http://www.pnas.org/local/css/hw-local-home.css
  • http://www.pnas.org/site/css/main.css
  • http://www.pnas.org/site/css/global_styles.css
Show how to fix
Optimize images
Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 127.6KiB (45% reduction).

  • Compressing http://www.pnas.org/site/misc/images/india-home.jpg could save 18.3KiB (68% reduction).
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  • Compressing http://www.pnas.org/site/misc/images/cellular-home.jpg could save 17.7KiB (78% reduction).
  • Compressing http://www.pnas.org/content/113/44/local/cover-banner.jpg could save 15KiB (18% reduction).
  • Compressing http://www.pnas.org/site/misc/images/forestfire-home.jpg could save 14.4KiB (66% reduction).
  • Compressing http://www.pnas.org/site/misc/images/tomatoes-home.jpg could save 12.3KiB (55% reduction).
  • Compressing http://www.pnas.org/site/misc/images/child-home.jpg could save 10.5KiB (61% reduction).
  • Compressing http://www.pnas.org/local/img/nav/headline.png could save 3.2KiB (48% reduction).
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  • Compressing http://www.pnas.org/local/img/sidebar/square.gif could save 1.1KiB (92% reduction).
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Show how to fix
  Consider Fixing:
Enable compression
Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 58.4KiB (69% reduction).

  • Compressing https://d1bxh8uas1mnw7.cloudfront.net/assets/altmetric_badges-8f271adb184c21cc5169a7f67f7fe5ab.js could save 58.4KiB (69% reduction).
Show how to fix
Minify CSS
Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 7.9KiB (28% reduction).

  • Minifying http://www.pnas.org/local/css/hw-local-global.css could save 3.1KiB (29% reduction) after compression.
  • Minifying http://www.pnas.org/site/css/global_styles.css could save 1.1KiB (25% reduction) after compression.
  • Minifying http://www.pnas.org/shared/css/standard-designs/design25/ui.css could save 1.1KiB (26% reduction) after compression.
  • Minifying http://www.pnas.org/shared/css/hw-global-elements.css could save 1KiB (44% reduction) after compression.
  • Minifying http://www.pnas.org/shared/css/hw-global-citation.css could save 754B (38% reduction) after compression.
  • Minifying http://www.pnas.org/shared/css/hw-global-sidebars.css could save 754B (20% reduction) after compression.
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Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 1.6KiB (17% reduction).

  • Minifying http://www.pnas.org/ could save 1.6KiB (17% reduction) after compression.
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Minify JavaScript
Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 4.1KiB (30% reduction).

  • Minifying http://www.pnas.org/shared/js/hw-shared.js could save 2KiB (23% reduction) after compression.
  • Minifying http://www.pnas.org/local/js/expand.js could save 1.3KiB (45% reduction) after compression.
  • Minifying http://www.pnas.org/shared/js/fingerprint.js could save 754B (36% reduction) after compression.
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Avoid landing page redirects

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