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The endodermis is the boundary between the cortex and the stele. In many seedless plants, such as ferns, the endodermis is a distinct layer of cells immediately outside the vascular cylinder (stele) in roots and shoots. In most seed plants, especially woody types, the endodermis is present in roots but not in stems.
The Mysteries of Osiris, also known as Osirism, [1] were religious festivities celebrated in ancient Egypt to commemorate the murder and regeneration of Osiris.The course of the ceremonies is attested by various written sources, but the most important document is the Ritual of the Mysteries of Osiris in the Month of Khoiak, a compilation of Middle Kingdom texts engraved during the Ptolemaic ...
The hand and spirit of God are absent; instead, there are men – never very strong, often ineffective, seldom secure, always troubled....Powell's narrative pictures the partial breakdown of an infantry company: the personal ossification of some men, the cracking of the mold in others, the failure (and even death) of still others.
Outside the stele lies the endodermis, which is the innermost cell layer of the cortex. The concept of the stele was developed in the late 19th century by French botanists P. E. L. van Tieghem and H. Doultion as a model for understanding the relationship between the shoot and root , and for discussing the evolution of vascular plant morphology ...
A germ layer is a primary layer of cells that forms during embryonic development. [1] The three germ layers in vertebrates are particularly pronounced; however, all eumetazoans (animals that are sister taxa to the sponges) produce two or three primary germ layers.
Later scholars called the thickened part of it the Carls Belt, which was named after Casbury [clarification needed]. [5] [16] The term "Caspary'schen fleck" (German: Caspary'schen fleck) appeared in the 1870s literature, [17] [18] and after the 20th century, it was often called the Casparian strip. In 1922, researchers first left the Casparian ...
Active transport is used to move most substances between the blood vessels and the osteocytes. [1] Haversian canals are contained within osteons, which are typically arranged along the long axis of the bone in parallel to the surface. The canals and the surrounding lamellae (8-15) form the functional unit, called a Haversian system, or osteon.
The cancellous part of bones contain bone marrow. Bone marrow produces blood cells in a process called hematopoiesis. [53] Blood cells that are created in bone marrow include red blood cells, platelets and white blood cells. [54] Progenitor cells such as the hematopoietic stem cell divide in a process called mitosis to produce precursor cells.