This site describes in detail the molecular and cellular events that occur as leukocytes contact, adhere to, and cross the endothelium of capillaries during an inflammatory reaction. It reviews five steps of the adhesion cascade: capture, rolling, slow rolling, firm adhesion, and transmigration. The site has extensive descriptions of the different molecules and processes involved in getting leukocytes from the blood to the sites of inflammation. In addition to a description of the process at the cellular and molecular level, there are also links to 3D rasmol models of the proteins, the DNA sequences in Genbank, and to the literature references in the Entrez database that forms the basis of the account provided.
Type of Material:
HTML, a rasmol viewer plugin if the links to the 3D structures are repaired.
Target Student Population:
College (Upper division and Graduate)
Evaluation and Observation
Quality of Content: (4.0)(4.0) = 4.0
The site offers a good description of the migration of leukocytes from the blood across the endothelium and into the surrounding tissue.
One of the site's authors is an active researcher in this field and the material is current and accurate.
However, the site is not complete, with several entries missing; pages on e-selectin, trauma, glycosylation, leading edge, and trailing edge are all still under construction and many of the pagesd on't have their links to Entrez or Genbank yet.
Potential Effectiveness as a Teaching Tool
Potential Effectiveness as a Teaching Tool: (3.5)(4.0) = 3.8
The extensive hyperlinked design makes it easy for the student to see how all of the different proteins and processes are connected. This would help to build the students knowledge and to develop a conceptual understanding of the process.
However, it is a static web site without any interactive components, there are no stated learning objectives, nor any problems or questions to promote active student involvement.
Ease of Use for Both Students and Faculty
Usability: (4.0)(3.5) = 3.8
Overall usability is good as every page has extensive hyper links to other relevant sections of the site, so a student can move freely through the material.
While there are no back buttons due to the free-form design, every page has a series of links at the bottom showing the main line through the site as well as a side frame with the same links. Some of the material on the site is hard to find,
however, since it is only accessible through hyperlinks from individual words.
The text is well written although it uses language that would be difficult to follow for someone without a good basic understanding of biology.
Unfortunately, all of the links to the 3D structures are currently broken as the 3D structure database has moved and there are other links and pages that aren't finished or are broken.
The fact that the graphics require 1024 x 768 screen resolution to display properly is a significant distraction for those students with monitors set for 800 x 600.
Features of Excellence:
The use of imagemaps and hyperlinked text gives the student many ways to see the interconnections between all of the parts of this complicated process.
The web site is optimized for 1024 x 768 pixel screen resolution so that with a screen set to display 800 x 600 pixels or less, part of the page is always off the screen. Optimizing the display for 800 x 600 screen resolution would be a big improvement and would avoid the necessity of constantly having to use horizontal sliders.
There are a 10-12 broken links that need fixing including some internal links.
Many of the pages can only be reached be clicking on specific words in other pages making it hard to find everything that is present on the site. A complete index or site map would improve this site.