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Pfund Cell - An early multipass absorption cell. Multiple-pass or long path absorption cells are commonly used in spectroscopy to measure low-concentration components or to observe weak spectra in gases or liquids. Several important advances were made in this area beginning in the 1930s, and research into a wide range of applications continues ...
A. Morula and B. cross section of a blastula displaying the blastocoel and blastoderm of early animal embryonic development. Blastulation is the stage in early animal embryonic development that produces the blastula. In mammalian development, the blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm.
Even at this depth, there is an underwater current, with a velocity of 0.5–1 m/s (1.6–3.3 ft/s), that disperses some of the deposited eggs downstream in the tributary system. Fertilized eggs are 3.1–3.25 mm (0.12–0.13 in) in diameter and are held in spaces between rocks as well as in the ice crystals of the slushy, tributary floor. [ 8 ]
The trophoblast cells form tight junctions between them making the structure leakproof. Trophoblast cells have sodium pumps on their membranes, and pump sodium into the centre of the morula. This draws fluid in through osmosis causing a cavity to form inside the morula, and to increase in size. [2] The cavity is the blastocoel.
This is an embryo 4 hours after fertilization before it has undergone MBT. 3 layers are present: yolk syncytial layer (YSL), enveloping layer (EVL), and deep cells (DEL). Before the embryo undergoes the midblastula transition it is in a state of fast and constant replication of cells. [1] The cell cycle is very short. The cells in the zygote ...
Like other Psammosteid Heterostracans, Tartuosteus had a broad and flattened body which was almost as wide as it was long, being 1 meter wide and an estimated 1.5 meters long. This impressive width is owed to its extended branchials, which are large wing-like bony fins extending from the body. The branchials of Tartuosteus form a boomerang-like ...
The ocean whitefish is found at depths between 3 and 150 m (9.8 and 492.1 ft). [1] It is found mainly over rocky substrates, but may also be encountered on Sandy or muddy substrates too. [2] This species has an extended spawning season which runs from the late autumn into early spring. The egg as and larvae are pelagic.
A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula. [1] It encloses the fluid-filled blastocoel. Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm. [2]
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