WordNet

a curve that is tangent to each of a family of curves
the bag containing the gas in a balloon (同)gasbag
a flat (usually rectangular) container for a letter, thin package, etc.
any wrapper or covering
a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
the maximum operating capability of a system (especially an aircraft); "test pilots try to push the envelope"
enclose or enfold completely with or as if with a covering; "Fog enveloped the house" (同)enfold, enwrap, wrap, enclose
making fertile as by applying fertilizer or manure (同)fertilisation, fecundation, dressing
creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant (同)fertilisation, fecundation, impregnation
surrounding and closing in on or hemming in; "the armys enveloping maneuver"

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Hydrodynamic evolution of sperm swimming: Optimal flagella by a genetic algorithm.

Ishimoto K1.
Journal of theoretical biology.J Theor Biol.2016 Jun 21;399:166-74. doi: 10.1016/j.jtbi.2016.03.041. Epub 2016 Apr 7.
Swimming performance of spermatozoa is an important index for the success of fertilization. For many years, numerous studies have reported the optimal swimming of flagellar organisms. Nevertheless, there is still a question as to which is optimal among planar, circular helical and ellipsoidal helica
PMID 27063642

Bone CR1, Starr DA2.
Journal of cell science.J Cell Sci.2016 May 15;129(10):1951-61. doi: 10.1242/jcs.179788.
Moving the nucleus to a specific position within the cell is an important event during many cell and developmental processes. Several different molecular mechanisms exist to position nuclei in various cell types. In this Commentary, we review the recent progress made in elucidating mechanisms of nuc
PMID 27182060

Poccia D1.
The International journal of developmental biology.Int J Dev Biol.2016 Apr 6. [Epub ahead of print]
Typically sperm nuclei are genetically inert and contain extremely compacted chromatin. Following fertilization, the first steps in their conversion to somatic nuclei (male pronuclei) which will support further development involve chromatin decondensation and the formation of a new nuclear envelope.
PMID 27160073