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The bulbus glandis (also called a bulb or knot) is an erectile tissue structure on the penis of canid mammals. During mating, immediately before ejaculation the tissues swell up to lock the male's penis inside the female. The locking is completed by circular muscles just inside the female's vagina; this is called "the knot" tightening thus ...
Molecular knot. In chemistry, a molecular knot is a mechanically interlocked molecular architecture that is analogous to a macroscopic knot. [1] Naturally-forming molecular knots are found in organic molecules like DNA, RNA, and proteins. It is not certain that naturally occurring knots are evolutionarily advantageous to nucleic acids or ...
And at least one other source uses the name "double bowline" for a mid-line loop knot made by tying a basic bowline with a bight of rope instead of the end. Tying. First, learn to tie the bowline by laying the working end on the standing part and twisting to form a loop (the "hole" that the rabbit comes out of).
Small-stuff is a nautical and knot-tying term for thin string or twine, as opposed to the thick, heavy ropes that are more often used in sailing. It is commonly used in a whipping to bind the ends of ropes to prevent fraying. Historically, the term referred to cordage less than one inch in circumference. [19]
Bow tie (biology) In the biological sciences, the term bow tie (so called for its shape) is a recent concept that tries to grasp the essence of some operational and functional structures observed in biological organisms and other kinds of complex and self-organizing systems. In general, bow tie architectures refer to ordered and recurrent ...
Knotted proteins are proteins whose backbones entangle themselves in a knot. One can imagine pulling a protein chain from both termini, as though pulling a string from both ends. When a knotted protein is “pulled” from both termini, it does not get disentangled. Knotted proteins are very rare, making up only about one percent of the ...
Rat king found in 1895 in Dellfeld, Germany, now in the Musée zoologique de la ville de Strasbourg, France. A rat king is a collection of rats or mice whose tails are intertwined and bound together in some way. This could be a result of an entangling material like hair, a sticky substance such as sap or gum, or the tails being tied together.
These homology theories have contributed to further mainstreaming of knot theory. In the last several decades of the 20th century, scientists and mathematicians began finding applications of knot theory to problems in biology and chemistry. Knot theory can be used to determine if a molecule is chiral (has a "handedness") or