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This process uses a non-germ-free mother which is sacrificed and sterilized before the pups' birth. After the cesarean birth, the pups must then be transferred to a sterile incubator with a germ-free mother for feeding and growth. [9] [10] These methods are only required for the generation of a germ-free mouse line. Once a line is generated ...
The Wechsler Preschool and Primary Scale of Intelligence (WPPSI) is an intelligence test designed for children ages 2 years 6 months to 7 years 7 months developed by David Wechsler in 1967. It is a descendant of the earlier Wechsler Adult Intelligence Scale and the Wechsler Intelligence Scale for Children tests. Since its original publication ...
Bisset [21] distinguished 1 class and 4 orders: Eubacteriales, Actinomycetales, Streptomycetales, and Flexibacteriales. Walter Migula 's system, [ 22 ] which was the most widely accepted system of its time and included all then-known species but was based only on morphology, contained the three basic groups Coccaceae, Bacillaceae, and ...
A germ cell is any cell that gives rise to the gametes of an organism that reproduces sexually. In many animals, the germ cells originate in the primitive streak and migrate via the gut of an embryo to the developing gonads. There, they undergo meiosis, followed by cellular differentiation into mature gametes, either eggs or sperm.
Methylation of cytosines in CpG sites in promoter regions of genes can reduce or silence gene expression. [21] About 28 million CpG dinucleotides occur in the human genome, [22] and about 24 million CpG sites in the mouse genome (which is 86% as large as the human genome [23]). In most tissues of mammals, on average, 70% to 80% of CpG cytosines ...
Germ (microorganism), an informal word for a pathogen; Germ cell, cell that gives rise to the gametes of an organism that reproduces sexually; Germ layer, a primary layer of cells that forms during embryonic development; Cereal germ, the reproductive part of a cereal grain; Tooth germ, an aggregation of cells that eventually forms a tooth
The germ theory of disease is the currently accepted scientific theory for many diseases. It states that microorganisms known as pathogens or "germs" can cause disease. These small organisms, which are too small to be seen without magnification, invade humans, other animals, and other living hosts. Their growth and reproduction within their ...
The smallest penguin species is the little blue penguin (Eudyptula minor), which stands around 30–33 cm (12–13 in) tall and weighs 1.2–1.3 kg (2.6–2.9 lb). [ 74 ] The smallest bird of prey is the Black-thighed falconet ( Microhierax fringillarius ), with a wingspan of 27–32 centimetres (11–13 in), roughly the size of a sparrow .
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