科学技术类搜索引擎及目录索引

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科学技术Science：

子类：

COS Expertise - Search profiles of 400,000 scientists and scholars, includes contact information, positions held, publications, patents, funding received, and a first-person narrative describing current research activities and expertise.

Editors' Selections - Scientific American's editors compliation of science links on the web.

eNature - Directory of searchable field guides by the National Audubon Society.

PrePRINT Network - Searchable gateway to preprint servers that deal with scientific and technical disciplines of concern to DOE. Such disciplines include the great bulk of physics, materials, and chemistry, as well as portions of biology, environmental sciences and nuclear medicine.

PubSCIENCE - Search across a large compendium of peer-reviewed journal literature with a focus in the phycial sciences at no cost. Links to full-text journal articles are available with a subscription or by pay-per-view arrangement with the publisher.

ResearchIndex - The NECI Scientific Literature Digital Library. Autonomously creates citation indexes of scientific literature. Generates citation statistics and allows easy browsing of the context of citations.

RusIntellect.com - Directory of the scientific and engineering resources of Russia and the other Newly
Independent States. Includes links on scientific articles, conferences, seminars, exhibitions, information on personalities, technologies, innovative companies, scientific and educational institutions, etc.

SciCentral - Directory of science and engineering online resources.

SciEd - Directory of science and mathematics education resources.

Science Stash - Directory of journals, periodicals, scientific resources and links to the best science sites on the Web.

SciNet Science Search - Delve into this science search engine and directory, which allows users to research a wide range of subjects, from agriculture to technology. Users can rate sites and leave comments.

SicRus - 107 million science specific pages, with new full-text additions like NASA reports, CogPrints pre- and postprints, and preprints from the Chemistry and Mathematics Preprint Servers...now offers over 17 million proprietary records that cannot be found using generic search engines.

SciSeek - Guide to the best the Internet has to offer in the fields of science and nature.

Xplore Science - Directory of science related resources.