Handbook of Fluorescent Probes and Research Chemicals(部分免费)
【数据内容】
The Handbook of Fluorescent Probes and Research Chemicals contains up-to-date background and technical information on Molecular Probes complete product line. This Web Edition of the Handbook is an updated version of the Seventh Edition.

ECDYBASE (The Ecdysone Handbook)(免费)
The " Ecdysone Handbook " was originally created by René Lafont and Ian D. Wilson and published in 1992 by the Chromatographic Society (Nottingham, U.K.). Its aim was to provide general data on all natural ecdysteroids described so far. Each data sheet contained (whenever available) spectroscopic (UV, IR, MS and NMR) and chromatographic data together with a few selected general references. As the ecdysteroid family continued to increase, a second enlarged edition was published in 1996, but the number of compounds is still growing (more than 300 compounds were described at the onset of year 2000).

WebElements periodic table of the elements
一个详尽的元素周期表，有每种元素各项数据的介绍，并配有相关照片。 Internet和世界上最好的元素周期表。 WebElements is rated as Best of the Web.

The Periodic Table of the Elements on the Internet
在线元素周期表。提供了109个元素的多种性质，包括基本信息（名称、原子序数、物理性质等）、原子结构（电子排布）、同位素、事实（发现历史等）和相关链接（提供进一步信息的网站）。特别之处是提供了多种显示周期表的选择，分为两大类，包括在周期表上首先显示的性质（名称、原子序数、发现时间等）和按类型（碱金属、卤素等），以便适合于不同的需要。

Chemicool Periodic Table
一个元素周期表，提供103个元素的一般、状态、能量（第一电离能等）、电子价态、特征、反应情况、传导性等性质。