L-39
L39 or L-39 may refer to: * 60S ribosomal protein L39 * Aero L-39 Albatros, a Czechoslovakian jet trainer * Bell L-39, an American experimental aircraft * , a destroyer of the Royal Navy * , a sloop of the Royal Navy * Lahti L-39, an anti-tank rifle * Mitochondrial ribosomal protein L39 * Ramona Airport Ramona Airport is a public airport two miles west of Ramona, in San Diego County, California, United States. The airport is mostly used for general aviation, the California Department of Forestry (CDF) and the United States Forest Service (USFS ...

Aero L-39 Albatros
The Aero L-39 Albatros is a high-performance jet trainer designed and produced in Czechoslovakia by Aero Vodochody. It is the most widely used jet trainer in the world; in addition to performing basic and advanced pilot training, it has also flown combat missions in a light-attack role. Unusually, the aircraft never received a NATO reporting name. The L-39 Albatros was designed during the 1960s as a successor to the Aero L-29 Delfín, an early jet-powered principal training aircraft. Performing its maiden flight on 4 November 1968, it became the first trainer aircraft in the world to be equipped with a turbofan powerplant. Quantity production of the L-39 Albatros proceeded in 1971; one year later, it was formally recognized by the majority of the Warsaw Pact countries as their preferred primary trainer. Accordingly, thousands of L39s would be produced for various military customers in Eastern Europe. Additionally, it was exported to a range of countries across the world both as ...
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Bell L-39
The Bell L-39 was an experimental aircraft used to test the characteristics of swept wings. Design and development After the end of World War II, the United States military took interest in German aerodynamic research into swept wings. To test the low-speed characteristics of swept wings, the US Navy contracted Bell Aircraft to modify two P-63s as test aircraft for use by the NACA. These aircraft, assigned the bureau numbers 90060 and 90061, were designated L-39-1 and L-39-2, which were not standard Navy designations, but were based on Bell's code letter "L" and the aircraft's model number "39". Both aircraft were fitted with straight inner wing panels and 35 degree swept outer panels derived from the P-63E, both sections lacking dihedral. A pair of cameras were mounted behind the canopy to film the airflow pattern, which was indicated by tufts of string attached to the wings. Leading-edge slots could be bolted into the wings in different configurations. The main lan ...
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Lahti L-39
The Lahti L-39 is a Finnish 20 mm anti-tank rifle used during the Second World War. It had excellent accuracy, penetration and range, but its size made transportation difficult. It was nicknamed "Norsupyssy" ("Elephant Gun"), and as tanks developed armor too thick for the Lahti to penetrate, its uses switched to long range sniping, tank harassment and with the L-39/44 fully automatic variant, employment as an improvised anti-aircraft weapon. Development Aimo Lahti had doubts about the original idea of a 13 mm anti-tank machine gun and started working on a 20 mm design. Officers who wanted smaller caliber anti-tank weapons believed that the muzzle velocities of 20 mm shells were insufficient to penetrate armor, and a weapon with a higher rate of fire and in a smaller caliber would prove useful. As a result, Lahti designed two competing anti-tank weapons: a 13.2 mm machine gun and a 20 mm rifle. After test firing both weapons in 1939, they found that th ...
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60S Ribosomal Protein L39
60S ribosomal protein L39 is a protein that in humans is encoded by the ''RPL39'' gene. Ribosomes, the organelles that catalyze protein synthesis, consist of a small 40S subunit and a large 60S subunit. Together these subunits are composed of 4 RNA species and approximately 80 structurally distinct proteins. This gene encodes a ribosomal protein that is a component of the 60S subunit. The protein belongs to the S39E family of ribosomal proteins. It is located in the cytoplasm. In rat, the protein is the smallest, and one of the most basic, proteins of the ribosome. This gene is co-transcribed with the U69 small nucleolar RNA gene, which is located in its second intron. As is typical for genes encoding ribosomal proteins, there are multiple processed pseudogene Pseudogenes are nonfunctional segments of DNA that resemble functional genes. Most arise as superfluous copies of functional genes, either directly by DNA duplication or indirectly by Reverse transcriptase, reverse trans ...
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Mitochondrial Ribosomal Protein L39
39S ribosomal protein L39, mitochondrial is a protein that in humans is encoded by the ''MRPL39'' gene. Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, respo ... to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence ...
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