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Biological organisation is the organisation of complex biological structures and systems that define life using a reductionistic approach. [1] The traditional hierarchy, as detailed below, extends from atoms to biospheres. The higher levels of this scheme are often referred to as an ecological organisation concept, or as the field, hierarchical ...
Schein's model of organizational culture originated in the 1980s. Schein (2004) identifies three distinct levels in organizational cultures: artifacts and behaviours; espoused values; assumptions; The three levels refer to the degree to which the different cultural phenomena are visible to the observer. Artifacts include any tangible, overt or ...
Organizational culture encompasses the shared norms, values, behaviors observed in schools, universities, not-for-profit groups, government agencies, and businesses reflecting their core values and strategic direction.
The mixed culture forms large multi-cellular aggregates. At a tissue level, ignoring the means of control, morphogenesis arises because of cellular proliferation and motility. [ 9 ] Morphogenesis also involves changes in the cellular structure [ 10 ] or how cells interact in tissues.
Two useful introductions to the fundamental theory underlying the unit of selection issue and debate, which also present examples of multi-level selection from the entire range of the biological hierarchy (typically with entities at level N-1 competing for increased representation, i.e., higher frequency, at the immediately higher level N, e.g., organisms in populations or cell lineages in ...
The levels concept is an intellectual framework for structuring reality. It arranges all entities, structures, and processes in the universe, or in a certain field of study, into a hierarchy, typically based on how complex their organization is. When arranged this way, each entity is three things at the same time: It is made up of parts from ...
In biology, tissue is an assembly of similar cells and their extracellular matrix from the same embryonic origin that together carry out a specific function. [1] [2] Tissues occupy a biological organizational level between cells and a complete organ. Accordingly, organs are formed by the functional grouping together of multiple tissues. [3]
Tissue culture is an important tool for the study of the biology of cells from multicellular organisms. It provides an in vitro model of the tissue in a well defined environment which can be easily manipulated and analysed. In animal tissue culture, cells may be grown as two-dimensional monolayers (conventional culture) or within fibrous ...