WordNet

a part of the cell containing DNA and RNA and responsible for growth and reproduction (同)cell_nucleus, karyon
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
the positively charged dense center of an atom
the male reproductive cell; the male gamete; "a sperm is mostly a nucleus surrounded by little other cellular material" (同)sperm_cell, spermatozoon, spermatozoan

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/06/11 01:27:55」(JST)

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1. 男性不妊症の治療 treatment of male infertility
2. 卵細胞質内精子注入法 intracytoplasmic sperm injection
3. 処置済み精液を用いた子宮内授精（IUI）のための手順 procedure for intrauterine insemination iui using processed sperm
4. 男性不妊症の評価 evaluation of male infertility
5. 男性避妊のための精管切除およびその他の精管閉鎖法 vasectomy and other vasal occlusion techniques for male contraception

Genome wide identification of promoter binding sites for H4K12ac in human sperm and its relevance for early embryonic development.

Paradowska AS, Miller D, Spiess AN, Vieweg M, Cerna M, Dvorakova-Hortova K, Bartkuhn M, Schuppe HC, Weidner W, Steger K.SourceDepartment of Urology, Pediatric Urology and Andrology; Justus Liebig University of Giessen; Giessen, Germany.
Epigenetics : official journal of the DNA Methylation Society.Epigenetics.2012 Sep 1;7(9). [Epub ahead of print]
Sperm chromatin reveals two characteristic features in that protamines are the predominant nuclear proteins and remaining histones are highly acetylated. Histone H4 acetylated at lysine 12 (H4K12ac) is localized in the post-acrosomal region, while protamine-1 is present within the whole nucleus. Chr
PMID 22894908

Ultrastructure of the spermatozoa of Cicadella viridis (Linnaeus) and its bearing on the phylogeny of Auchenorrhyncha.

Zhang B, Dai W.SourceKey Laboratory of Plant Protection Resources and Pest Integrated Management, Ministry of Education, Entomological Museum, Northwest A&F University, Yangling, Shaanxi 712100, China.
Micron (Oxford, England : 1993).Micron.2012 Sep;43(9):978-84. Epub 2012 Apr 4.
The ultrastructure of mature spermatozoa of the leafhopper Cicadella viridis (Linnaeus) was investigated using light and transmission electron microscopy. The spermatozoon is composed of a head containing an acrosome and an elongated nucleus, and a long tail, which consists of a flagellum. The acros
PMID 22503399