Annelid setae are stiff bristles present on the body. They help, for example, earthworms to attach to the surface and prevent backsliding during peristaltic motion. These hairs make it difficult to pull a worm straight from the ground. Setae in oligochaetes (a group including earthworms) are largely composed of chitin.[1] They are classified according to the limb to which they are attached; for instance, notosetae are attached to notopodia; neurosetae to neuropodia.[2]

Crustaceans have mechano- and chemosensory setae.[3] Setae are especially present on the mouthparts of crustaceans[3] and can also be found on grooming limbs.[4] In some cases, setae are modified into scale like structures.[4] Setae on the legs of krill and other small crustaceans help them to gather phytoplankton. It captures them and allows them to be eaten.


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Setae on the integument of insects are unicellular, meaning that each is formed from a single epidermal cell of a type called a trichogen, literally meaning "bristle generator". They are at first hollow and in most forms remain hollow after they have hardened. They grow through and project through a secondary or accessory cell of a type called a tormogen, which generates the special flexible membrane that connects the base of the seta to the surrounding integument. Depending partly on their form and function, setae may be called hairs, macrotrichia, chaetae, or scales. The setal membrane is not cuticularized and movement is possible. Some insects, such as Eriogaster lanestris larvae, use setae as a defense mechanism, as they can cause dermatitis when they come into contact with skin.[5]

The pads on a gecko's feet are small hair-like processes that play a role in the animal's ability to cling to vertical surfaces. The micrometer-scale setae branch into nanometer-scale projections called spatulae.[6]

In 2017, a description of a new species of basal deuterostome called Saccorhytus was published. This animal appears to have seta in the pores along the side of its body.[8] However, in 2022, Saccorhytus is considered to be an early ecdysozoan, and was described as having "lacked setae".[9]

In mycology, "setae" refer to dark brown, thick-walled, thorn-like cystidia found in corticioid and poroid fungi in the family Hymenochaetaceae.[10] Though mainly microscopic, the setae of some species may be sufficiently prominent to be visible with a hand lens.

In botany, "seta" refers to the stalk supporting the capsule of a moss or liverwort (both closely related in a clade called "Setaphyta"), and supplying it with nutrients. The seta is part of the sporophyte and has a short foot embedded in the gametophyte on which it is parasitic. Setae are not present in all mosses, but in some species they may reach 15 to 20 centimeters in height.[11]

In the diatom family Chaetocerotaceae, "seta" refers to the hairlike outgrowths of the valve, i.e. of the face of the cells.[12] These setae have a different structure than the valve. Such setae may prevent rapid sinking and also protect the cells from grazing.

Synthetic setae are a class of synthetic adhesives that detach at will, sometimes called resettable adhesives, yet display substantial stickiness. The development of such synthetic materials is a matter of current research.[6][13][14]

My confusion is, when I looked up this instruction online, it said seta sets the lower byte to 0x01 if its above a certain value, otherwise its 0x00. Similar for setb, which sets the byte to 0x01 if its below a certain value.

The Seta line, just like the precious namesake fabric (seta is Italian for silk), takes on a different colour depending on the light it reflects, which is why it creates extremely charming solutions. By nature, these surfaces adapt to both outdoor settings and indoor ones, where they blend in seamlessly with other materials, first and foremost natural wood.

Through active involvement with major national and international standardisation bodies including ASTM, IP, ISO, BSI and DIN, and by working closely with our leading customers, we contribute to test method specifications that today determine the quality standards of many products. As market leaders in the manufacturing of petroleum test equipment Stanhope-seta have set industry benchmarks around the world; for example with our flashpoint testers, oil test centrifuges and vapour pressure testers. e24fc04721

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