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DNA topoisomerase 1 is a topoisomerase enzyme that catalyzes ATP-independent breakage of single-stranded DNA, followed by passage and rejoining. It catalyzes reaction that leads to the conversion of one topological isomer of DNA to another.

An-Najah National University provides English language video lectures free of charge on the website. This service allows both An-Najah and international students to benefit from the knowledge being passed down by the faculty.

This green blog from Chicago is dedicated to fight climate change and to inform its visitors of current environmental issues and challenges. You may subscribe to receive free site updates and news on latest green technology, products and politics.

Protocol Directory contains links and information on biology and molecular biology protocols, techniques and methods for research and laboratory studies. Western blot, protein, signal transduction, chemistry, biochemistry, cell culture, and immunology.

Web portal is designed to provide facts about telecommunication. Comprises publications and data on online phone cards.

Your source for links, methods and protocols on cell and tissue culture. Find information on cell cloning, counting, growth, harvesting, isolation, cell lines, preparation, preservation, storage, contamination, decontamination and growth media.

Find links and information on cellular pathways and cell siganling. Topics include phosphorylation, nitric oxide, receptor signaling, receptor signal transduction, lipid signaling, multi-drug resistance, neurotransmission and neurobiology and more.

Find links to protein expression and yeast protein expression protocols, kits and systems. Links also on recombinant protein expression systems and protein extraction, interactions, labeling, modification, precipitation, translation and electrophoresis.

Find information, assays, links and protocols on the cell signalling molecules, Interleukins, which are part of the cytokine superfamily. Links on all 35 interleukins, interleukin assays, chemokine, cytokine, cytokine array, interferon and protocols are available.

Biology Disease is a web portal for human biology and human diseases. It provides resources, links and pictures on biology topics in humans, as well as in animals, plants, microbiology, molecular biology, cell biology and ecology with an emphasis on the role in diseases.

Custom Antibody Services provides information and links to custom monoclonal antibody and custom polyclonal antibody services, peptide synthesis, recombinant proteins, large scale antibody production and antibody suppliers and antibody software.

ScientifiQ is the place where scientists and just people with interest in science can ask and answer questions on any topic. The power of knowledge is to share - why not share your facts, opinions and personal experiences with the ScientifiQ community?

biology and medical related electronic textbooks, reviews, encyclopedias and references. biology and medical related journals and magazines. the most popular life sciences public databases containing exhaustive information for genes and proteins.

Kratom-name has a wealth of information about wholesale kratom, health benefits and how to overcome opiate addiction with the help of kratom.

Find information and links on SDS-PAGE, Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis, such as on principles, methods, techniques and protocols on staining, transfer, troubleshooting, 2-dimensional sds-page, buffer recipes, solution recipes, gels and agarose gel electrophoresis.

Normal Histology provides information and images on human histology of the adrenal gland, kidney, bone, breast, colon, esophagus, heart, liver, lung, lymph node, pancreas, thyroid, placenta, prostate, skin, stomach, testis, uterus, cancer and more.

Polar Bear known as great white bear is descended from brown bear ancestors. Bear Planet is a unique place to find general knowledge about polar bear from their eating habits to anatomy to behavior.