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Duluth, Missabe & Iron Range 2-8-8-4 "Yellowstone" No. 229, as preserved in 1987 A 2-8-8-4 steam locomotive, under the Whyte notation , has two leading wheels , two sets of eight driving wheels , and a four-wheel trailing truck .
Angelman syndrome; Other names: Angelman's syndrome [1] [2]: A five-year-old girl with Angelman syndrome. Features shown include telecanthus, bilateral epicanthic folds, small head, wide mouth, and an apparently happy demeanor; hands with tapered fingers, abnormal creases and broad thumbs.
Trisomy 16 is a chromosomal abnormality in which there are 3 copies of chromosome 16 rather than two. [1] It is the most common trisomy leading to miscarriage and the second most common chromosomal cause of it, closely following X-chromosome monosomy. [2] About 6% of miscarriages have trisomy 16. [3]
The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...
[2] [3] Most patients develop seizures the first few years of life, but the age of onset ranges from ages 1 to 17. Different types of seizure have been reported in this syndrome. The most common seizure type appears to be brief focal onset epileptic seizures with impairment of consciousness and awareness, known as complex partial seizures.
Klinefelter syndrome (KS), also known as 47,XXY, is a chromosome anomaly where a male has an extra X chromosome. [10] These complications commonly include infertility and small, poorly functioning testicles (if present).
The former results in a chromosomal abnormality featured in all cells of the offspring, as in translocation carriers. Somatic translocations, on the other hand, result in abnormalities featured only in the affected cell and its progenitors, as in chronic myelogenous leukemia with the Philadelphia chromosome translocation.
8 is the only composite number with a prime aliquot sum of 7 (1 + 2 + 4) [6] that is part of the aliquot sequence (8, 7, 1, 0). 8 is the first number to be the aliquot sum of two numbers: the discrete semiprime 10 = 5 × 2, and squared prime 49 = 7 2. 8 is the number of known primary pseudoperfect numbers, [7] the smallest four (2, 6, 42, 1806 ...