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Some sociologists and anthropologists consider the extended family structure to be the most common family structure in most cultures and at most times for humans, rather than the nuclear family. [1] [2] The term nuclear family was popularized in the twentieth century. Since that time, the number of North American nuclear families is gradually ...
The nuclear family consists of a mother, father, and the children. The two-parent nuclear family has become less prevalent, and pre-American and European family forms have become more common. [2] Beginning in the 1970s in the United States, the structure of the "traditional" nuclear American family began to change.
The liquid drop model is one of the first models of nuclear structure, proposed by Carl Friedrich von Weizsäcker in 1935. [5] It describes the nucleus as a semiclassical fluid made up of neutrons and protons, with an internal repulsive electrostatic force proportional to the number of protons.
The system is widely used in non-unilineal societies, where the dominant relatives are the immediate family. In most Western societies, the nuclear family represents an independent social and economic group, which has caused the emphasis on the immediate kinship. The tendency of families in Western societies to live apart also reinforces this.
A tetraloop is a four-base pairs hairpin RNA structure. There are three common families of tetraloop in ribosomal RNA: UNCG, GNRA, and CUUG (N is one of the four nucleotides and R is a purine). UNCG is the most stable tetraloop. [9] Pseudoknot is an RNA secondary structure first identified in turnip yellow mosaic virus. [10]
Nuclear DNA is a nucleic acid, a polymeric biomolecule or biopolymer, found in the nucleus of eukaryotic cells.Its structure is a double helix, with two strands wound around each other, a structure first described by Francis Crick and James D. Watson (1953) using data collected by Rosalind Franklin.
A genogram, also known as a family diagram, [1] [2] is a pictorial display of a person's position and ongoing relationships in their family's hereditary hierarchy. It goes beyond a traditional family tree by allowing the user to visualize social patterns and psychological factors that punctuate relationships, especially patterns that repeat over the generations.
Examples of different levels of nuclear architecture. Nuclear organization refers to the spatial organization and dynamics of chromatin within a cell nucleus during interphase. There are many different levels and scales of nuclear organisation. At the smallest scale, DNA is packaged into units called nucleosomes, which compacts DNA about 7-fold.