the siphonophorae or siphonophora, the siphonophores, are an order of the hydrozoans, a class of marine animals belonging to the phylum cnidaria.according to the world register of marine species, the order contains 188 species. although a siphonophore may appear to be a single organism, each specimen is in fact a colonial organism composed of small individual animals called zooids that have .
a benign tumor is a mass of cells that lacks the ability to either invade neighboring tissue or metastasize. when removed, benign tumors usually do not grow back, whereas malignant tumors sometimes do. unlike most benign tumors elsewhere in the body, benign brain tumors can be life-threatening. benign tumors generally have a slower growth rate than malignant tumors and the tumor cells are usually more differentiated. they are typically surrounded by an outer surface or stay contained within the
hemolysis from greek αιμόλυση, meaning 'blood breakdown' is the breakdown of red blood cells.the ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms.this is particularly useful in classifying streptococcal species. a substance that causes hemolysis is a hemolysin
satellite glial cells are glial cells that cover the surface of nerve cell bodies in sensory, sympathetic, and parasympathetic ganglia. both satellite glial cells sgcs and schwann cells the cells that ensheathe some nerve fibers in the pns are derived from the neural crest of the embryo during development. sgcs have been found to play a variety of roles, including control over the .
chara is a genus of charophyte green algae in the family characeae.they are multicellular and superficially resemble land plants because of stem-like and leaf-like structures.they are found in fresh water, particularly in limestone areas throughout the northern temperate zone, where they grow submerged, attached to the muddy bottom.
biphenotypic acute leukaemia bal is an uncommon type of leukemia which arises in multipotent progenitor cells which have the ability to differentiate into both myeloid and lymphoid lineages. it is a subtype of 'leukemia of ambiguous lineage'. the direct reasons leading to bal are still not clear. bal can be de novo or secondary to previous cytotoxic therapy.
halorhodospira halophila is a species of halorhodospira distinguished by its ability to grow optimally in an environment of 15–20% salinity. it was formerly called ectothiorhodospira halophila.it is an anaerobic, rod-shaped gram-negative bacterium. h. halophila has a flagellum.
history. zoothamnium was initially classified as a member of the family vorticellidae by ehrenberg in 1838. it was later reclassified to the family zoothaminiidae, a new family defined by sommer, in 1951. the unique ability of the central stalk to contract in a zig-zag pattern made the reclassification a necessity. zoothamnium is a sessile peritrich, meaning it is a ciliated vase shaped .
zygosaccharomyces bailii is a species in the genus zygosaccharomyces.it was initially described as saccharomyces bailii by lindner in 1895, but in 1983 it was reclassified as zygosaccharomyces bailii in the work by barnett et al.. spoilage resulting from growth of the yeast zygosaccharomyces is widespread, which has caused significant economic losses to the food industry.
the ability of cells to perceive and correctly respond to their microenvironment is the basis of development, tissue repair, and immunity, as well as normal tissue homeostasis. errors in signaling interactions and cellular information processing may cause diseases such as cancer, autoimmunity, and diabetes. by understanding cell signaling, clinicians may treat diseases more effectively and, theoretically, researchers may develop artificial tissues.
lemnoideae is a subfamily of flowering aquatic plants, known as duckweeds, water lentils, or water lenses. they float on or just beneath the surface of still or slow-moving bodies of fresh water and wetlands. also known as 'bayroot', they arose from within the arum or aroid family, so often are classified as the subfamily lemnoideae within the family araceae. other classifications, particularly those created prior to the end of the 20th century, place them as a separate family, lemnaceae. these
eukaryote cells include a variety of membrane-bound structures, collectively referred to as the endomembrane system. simple compartments, called vesicles and vacuoles, can form by budding off other membranes.many cells ingest food and other materials through a process of endocytosis, where the outer membrane invaginates and then pinches off to form a vesicle.
a neuron, neurone old british spelling or nerve cell, is an electrically excitable cell that communicates with other cells via specialized connections called synapses. it is the main component of nervous tissue in all animals except sponges and placozoa. plants and fungi do not have nerve cells.
during vertebrate embryonic development, chromatophores are one of a number of cell types generated in the neural crest, a paired strip of cells arising at the margins of the neural tube. these cells have the ability to migrate long distances, allowing chromatophores to populate many organs of the body, including the skin, eye, ear, and brain.