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Nucleic Acid Analogue
Nucleic acid analogues are compounds which are Analog (chemistry), analogous (structurally similar) to naturally occurring RNA and DNA, used in medicine and in molecular biology research. Nucleic acids are chains of nucleotides, which are composed of three parts: a phosphate backbone, a pentose sugar, either ribose or deoxyribose, and one of four nucleobases. An analogue may have any of these altered. Typically the analogue nucleobases confer, among other things, different base pairing and base stacking properties. Examples include universal bases, which can pair with all four canonical bases, and phosphate-sugar backbone analogues such as peptide nucleic acid, PNA, which affect the properties of the chain (PNA can even form a triple helix). Nucleic acid analogues are also called Xeno Nucleic Acid and represent one of the main pillars of xenobiology, the design of new-to-nature forms of life based on alternative biochemistries. Artificial nucleic acids include peptide nucleic ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mazda MX-5 (NA)
The Mazda MX-5 (NA) (sold in Japan as the and in North America as the Mazda MX-5 Miata) is the first generation of the Mazda MX-5 manufactured from 1989 to 1997. Inspired by the post-war era British sports cars, the MX-5 rejuvenated interest in roadsters after the demise of cars such as the MG B and Triumph Spitfire. Since its debut, the MX-5 has won numerous automotive awards and has become the world's best selling sports car. Background The MX-5 was unveiled at the Chicago Auto Show on February 10, 1989, with a price tag of . The MX-5, with production code NA, was made available for delivery to buyers worldwide in the following dates: May 1989 (as a 1990 model) in the US and Canada; September 1, 1989 in Japan; and 1990 in Europe. An optional hardtop was made available at the same time, in sheet moulding compound (SMC). Demand initially outstripped production, fueled by enthusiastic press reviews. In Japan, the car was not badged as a Mazda, as the company was in the pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nepal Airlines
Nepal Airlines Corporation ( ne, नेपाल वायुसेवा निगम, Nepāl Vāyusevā Nigam, Nepal Air Service Corporation), formerly known as Royal Nepal Airlines ( ne, शाही नेपाल वायुसेवा, Śāhī Nepāl Vāyusevā, Royal Nepal Air Service, label=none), is the flag carrier of Nepal. Founded in 1958, it is the oldest airline of the country. Out of its main base at Tribhuvan International Airport, Kathmandu, the airline operates domestic services within Nepal and medium-haul services in Asia. The airline's first aircraft was a Douglas DC-3, used to serve domestic routes and a handful of destinations in India. The airline acquired its first jet aircraft, Boeing 727s, in 1972. As of 13 July 2020, the airline operates a fleet of seven aircraft. Since 2013, the airline has been on the list of air carriers banned in the European Union. History 1950s and 1960s: early years The airline was established in July 1958 as Royal Nepal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numerical Aperture
In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one material to another, provided there is no refractive power at the interface. The exact definition of the term varies slightly between different areas of optics. Numerical aperture is commonly used in microscopy to describe the acceptance cone of an objective (and hence its light-gathering ability and resolution), and in fiber optics, in which it describes the range of angles within which light that is incident on the fiber will be transmitted along it. General optics In most areas of optics, and especially in microscopy, the numerical aperture of an optical system such as an objective lens is defined by :\mathrm = n \sin \theta, where is the index of refraction of the medium i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Namibia
Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and east. Although Kazungula, it does not border Zimbabwe, less than 200 metres (660 feet) of the Botswanan right bank of the Zambezi, Zambezi River separates the two countries. Namibia gained independence from South Africa on 21 March 1990, following the Namibian War of Independence. Its capital and largest city is Windhoek. Namibia is a member state of the United Nations (UN), the Southern African Development Community (SADC), the African Union (AU) and the Commonwealth of Nations. The driest country in sub-Saharan Africa, Namibia has been inhabited since pre-historic times by the San people, San, Damara people, Damara and Nama people. Around the 14th century, immigration, immigrating Bantu peoples arrived as part of the Bantu expansion. Since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nomina Anatomica
''Nomina Anatomica'' (''NA'') was the international standard on human anatomic terminology from 1895 until it was replaced by ''Terminologia Anatomica'' in 1998. In the late nineteenth century some 30,000 terms for various body parts were in use. The same structures were described by different names, depending (among other things) on the anatomist's school and national tradition. Vernacular translations of Latin and Greek, as well as various eponymous terms, were barriers to effective international communication. There was disagreement and confusion among anatomists regarding anatomical terminology. Editions The first and last entries in the following table are not NA editions, but they are included for the sake of continuity. Although these early editions were authorized by different bodies, they are sometimes considered part of the same series. Before these codes of terminology, approved at anatomists congresses, the usage of anatomical terms was based on authoritative work ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
VFA-94
Strike Fighter Squadron 94 (VFA-94), also known as the Mighty Shrikes, is a United States Navy fighter squadron stationed at Naval Air Station Lemoore. It is an operational fleet squadron currently flying the Boeing F/A-18E/F Super Hornet, F/A-18F Super Hornet. It is attached to Carrier Air Wing 17 (CVW 17) and based at NAS Lemoore, California. Its tail code is "NA" and its radio call sign is "Hobo". Insignia and nickname The original squadron was known as the Tough Kitties and had a cartoon cat insignia. When the second squadron was formed and deployed aboard during its world cruise in 1954, it also used a cartoon cat insignia. There is no record of this insignia being officially approved for use by the squadron. The squadron’s first official insignia was approved by Chief of Naval Operations on 21 November 1955, and consisted of a yellow and black tiger paw with lightning bolts on a blue background. A new insignia was approved on 21 April 1959 consisting of a dark blue styliz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Airlines
North American Airlines, Inc., was a United States airline with its headquarters at the HLH Building in Peachtree City, Georgia in Greater Atlanta, United States. Prior to May 2008, it operated scheduled international services from the U.S. to Africa and Guyana. Later it operated domestic and international charter services and wet lease services. Its main aircraft and maintenance base was Tampa International Airport. History North American Airlines was a subsidiary of Global Aviation Holdings, Inc., formerly Global Aero Logistics, Inc. Unlike the other airlines that are or were a part of Global Aviation, ATA Airlines (now defunct) and World Airways (now defunct), North American was founded after airline deregulation in the United States. North American was established in 1989 and began operations on January 20, 1990. It was founded by Dan McKinnon, former head of the then-Civil Aeronautics Board. The airline was acquired by World Air Holdings in April 2005. It began by flying c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Na (cuneiform)
The cuneiform na sign is a common, multi-use sign, a syllabic for ''na'', and an alphabetic sign used for ''n'', or ''a''; it is common in both the ''Epic of Gilgamesh'' over hundreds of years, and the 1350 BC Amarna letters. In the ''Epic of Gilgamesh'' it also has sumerogramic (capital letter (majuscule)) usage for NA. An example usage for ''NA'' in the Epic is for the spelling of ''NA.GAD'', (also '' LÚ.NA.GAD'', and the plural '' LÚ.NA.GAD. MEŠ''), for Akkadian language "nāqidu", ''"herdsman"''. The usage for ''NA'' in herdsman is only for 3 spellings. The commonness of cuneiform ''na'', in the top 25 used signs by Buccellati (Buccellati 1979), (2nd highest usage, exceeded by a: ''a (cuneiform)'') is because of usage for the spelling of ''a-na'' (Akkadian language "ana") -, the common preposition spelling for English language: ''to, for, by, of, at, etc.''. It is also a component for the Akkadian language preposition: ''i-na'' (''ina''), meaning: ''in, into, by, etc.''. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naples
Naples (; it, Napoli ; nap, Napule ), from grc, Νεάπολις, Neápolis, lit=new city. is the regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 909,048 within the city's administrative limits as of 2022. Its province-level municipality is the third-most populous metropolitan city in Italy with a population of 3,115,320 residents, and its metropolitan area stretches beyond the boundaries of the city wall for approximately 20 miles. Founded by Greeks in the first millennium BC, Naples is one of the oldest continuously inhabited urban areas in the world. In the eighth century BC, a colony known as Parthenope ( grc, Παρθενόπη) was established on the Pizzofalcone hill. In the sixth century BC, it was refounded as Neápolis. The city was an important part of Magna Graecia, played a major role in the merging of Greek and Roman society, and was a significant cultural centre under the Romans. Naples served a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Africa
North Africa, or Northern Africa is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region, and it is sometimes defined as stretching from the Atlantic shores of Mauritania in the west, to Egypt's Suez Canal. Varying sources limit it to the countries of Algeria, Libya, Morocco, and Tunisia, a region that was known by the French during colonial times as "''Afrique du Nord''" and is known by Arabs as the Maghreb ("West", ''The western part of Arab World''). The United Nations definition includes Morocco, Algeria, Tunisia, Libya, Egypt, Sudan, and the Western Sahara, the territory disputed between Morocco and the Sahrawi Republic. The African Union definition includes the Western Sahara and Mauritania but not Sudan. When used in the term Middle East and North Africa (MENA), it often refers only to the countries of the Maghreb. North Africa includes the Spanish cities of Ceuta and Melilla, and plazas de s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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