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USMC F-4 pilots claimed three enemy MiGs at the cost of one aircraft in air-combat. USAF F-4 Phantom crews scored 107 + 1 ⁄ 2 MiG kills (including 33 + 1 ⁄ 2 MiG-17s, eight MiG-19s and 66 MiG-21s) at a cost of 33 Phantoms in air-combat. [92] F-4 pilots were credited with a total of 150 + 1 ⁄ 2 MiG kills at a cost of 42 Phantoms in air-combat.
In evolutionary psychology, people often speak of the four Fs which are said to be the four basic and most primal drives (motivations or instincts) that animals (including humans) are evolutionarily adapted to have, follow, and achieve: fighting, fleeing, feeding and fucking (a more polite synonym is the word "mating").
Principles of Biology is a college level biology electronic textbook published by Nature Publishing in 2011. The book is not a digitally reformatted version of a paper book. [ 1 ] The book, the first in a projected series, is Nature Publishing's first foray into textbook publishing.
The larger of the two is an F1 hybrid, while the smaller is an F4 hybrid. F1 hybrid (also known as filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. [1] F1 hybrids are used in genetics, and in selective breeding, where the term F1 crossbreed may be used.
α-helices are shown as coiled ribbons or thick tubes, β-sheets as arrows, and non-repetitive coils or loops as lines or thin tubes. The direction of the polypeptide chain is shown locally by the arrows, and may be indicated overall by a colour ramp along the length of the ribbon.
Regular polyhedra appear in biology as well. The coccolithophore Braarudosphaera bigelowii has a regular dodecahedral structure, about 10 micrometres across. [ 4 ] In the early 20th century, Ernst Haeckel described a number of species of radiolarians , some of whose shells are shaped like various regular polyhedra. [ 5 ]
Light sheet fluorescence microscopy or selective plane imaging microscopy (SPIM) uses illumination that is done perpendicularly to the direction of observation, by using a thin sheet of (laser) light. Under certain conditions, this illumination principle can be combined with fluorescence correlation spectroscopy, to allow spatially resolved ...
In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is typically chosen for better control on many surfaces, and is an important part of rally racing, as well as off-road driving.