TSF

TSF may refer to:

Broadcasting

Medicine

Companies

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TSF (radio station)

TSF is a Portuguese radio station, founded in 1989 and broadcasting from Lisbon.

TSF is one of the three main Portuguese radio news stations, alongside Antena 1 and Rádio Renascença. Its programs are focused on news. It was legally founded, though its first broadcast on 29 February 1988 was not legal, because at that time private radios were forbidden in Portugal. TSF is part of the Portuguese Global Media Group.

External links

Grumman XTSF

The Grumman XTSF was a proposed twin-engine torpedo scout aircraft, designed by Grumman for the United States Navy towards the end of World War II. Based on the design of the F7F Tigercat fighter, enlarged and with the addition of a bomb bay, the XTSF was deemed too large for carrier operations, and the project was cancelled before any aircraft were built. Instead, the Navy chose to order the single-engine XTB3F, which became the successful AF Guardian.

Design and development

In 1944, it was determined that the Grumman XTB2F, then under development for the Navy, would be too large to practically and safely operate from aircraft carriers. Even the new Midway-class aircraft carriers, known as "battle carriers" (CVB) and the largest aircraft carriers built by any nation to that point, would have difficulty operating the massive aircraft, which was the size of a U.S. Army Air Force medium bomber. As a result, in late June 1944, Grumman submitted its G-66 design to the Bureau of Aeronautics (BuAer). After a review of the design by BuAer during the following month, a revised design was submitted, and on August 17 the existing contract for the XTB2F was modified to instead order two XTSF-1 aircraft, to be based on Grumman's F7F-2 Tigercat two-seat, twin-engined fighter-bomber, the first prototype intended to be a conversion of a F7F airframe.

Boule

Boule may refer to:

See also

BOLL

Protein boule-like is a protein that in humans is encoded by the BOLL gene.

Function

This gene belongs to the DAZ gene family required for germ cell development. It encodes an RNA-binding protein which is more similar to Drosophila Boule than to human proteins encoded by genes DAZ (deleted in azoospermia) or DAZL (deleted in azoospermia-like). Loss of this gene function results in the absence of sperm in semen (azoospermia). Histological studies demonstrated that the primary defect is at the meiotic G₂ / M transition in fruitfly but in mice the primary defect is postmeiotic at round spermatid stage. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene.

The boule-like protein appears to be ubiquitously expressed in males of all animal species, except in the most primitive trichoplax.

References

Further reading

Boule (crystal)

A boule is a single crystal ingot produced by synthetic means. A boule of silicon is the starting material for most of the integrated circuits used today.

In the semiconductor industry, boules can be made by a number of methods, such as the Bridgman technique and the Czochralski process, which result in a cylindrical rod of material.

In the Czochralski process a seed crystal is required to create a larger crystal, or ingot. This seed crystal is dipped into the pure molten silicon and slowly extracted. The molten silicon grows on the seed crystal in a crystalline fashion. As the seed is extracted the silicon solidifies and eventually a large, cylindrical boule is produced.

A semiconductor crystal boule is normally cut with a diamond saw into circular wafers, and each wafer is polished to provide substrates suitable for the fabrication of semiconductor devices on its surface.

The process is also used to create sapphires, which are used for substrates in the production of blue and white LEDs, optical windows in special applications and as the protective covers for watches.