MCF

MCF can refer to:

Science and technology

Culture and entertainment

Photorhabdus luminescens

Photorhabdus luminescens (previously called Xenorhabdus luminescens) is a Gammaproteobacteria, belonging to the family Enterobacteriaceae, and is a lethal pathogen of insects.

It lives in the gut of an entomopathogenic nematode of the family Heterorhabditidae. When the nematode infects an insect, P. luminescens is released into the blood stream and rapidly kills the insect host (within 48 hours) by producing toxins, such as TcA.P. luminescens also produces a proteic toxin through the expression of a single gene called makes caterpillars floppy (mcf).

It also secretes enzymes which break down the body of the infected insect and bioconvert it into nutrients which can be used by both nematode and bacteria. In this way, both organisms gain enough nutrients to replicate (or reproduce in the case of the nematode) several times. The bacteria enter the nematode progeny as they develop.

3,5-Dihydroxy-4-isopropyl-trans-stilbene is produced by P. luminescens bacterial symbiont of the nematode Heterorhabditis megidis. Experiments with Galleria mellonella infected larvae supports the hypothesis that the compound has antibiotic properties that help minimize competition from other microorganisms and prevents the putrefaction of the nematode-infected insect cadaver.

Freescale ColdFire

The Freescale ColdFire is a microprocessor that derives from the Motorola 68000 family architecture, manufactured for embedded systems development by Freescale Semiconductor (formerly the semiconductor division of Motorola).

Instruction set

The ColdFire instruction set is "assembly source" compatible (by means of translation software available from the vendor) and not entirely object code compatible with the 68000. When compared to classic 68k hardware, the instruction set differs mainly in that it no longer has support for the binary-coded decimal (BCD) packed data format; it removes a number of other, less used instructions; and most instructions that are kept support fewer addressing modes. Also, floating point intermediates are 64 bits and not 80 bits as in the 68881 and 68882 coprocessors. The instructions are only 16, 32, or 48 bits long, a simplification compared to the 68000 series.

Models

In 2006, Debian project was looking into making its m68k port compatible with the ColdFires, as there are ColdFire models that are much faster than the 68060. They can be clocked as high as 300 MHz, compared with (officially) 75 MHz for a 68060 (the fastest "real" m68k processor) without overclocking (with overclocking, it can run on even 110 MHz). Stallion Technologies ePipe and Secure Computing SnapGearsecurity appliances are based on ColdFire processors. There are ColdFire Linux-based SBCs with Ethernet and CompactFlash as small as 23×55  mm or 45×45  mm or based on CompactFlash (37×43 mm) itself.