Ether

Ethers (/ˈiːθər/) are a class of organic compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups—of general formula R–O–R'. These ethers can again be classified into two varieties, if the alkyl groups are the same on both sides of the oxygen atom then it is a simple or symmetrical ether. Whereas if they are different the ethers are called mixed or unsymmetrical ethers A typical example is the solvent and anesthetic diethyl ether, commonly referred to simply as "ether" (CH₃-CH₂-O-CH₂-CH₃). Ethers are common in organic chemistry and pervasive in biochemistry, as they are common linkages in carbohydrates and lignin.

Structure and bonding

Ethers feature C-O-C linkage defined by a bond angle of about 110° and C-O distances of about 140 pm. The barrier to rotation about the C-O bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp³.

Oxygen is more electronegative than carbon, thus the hydrogens alpha to ethers are more acidic than in simple hydrocarbons. They are far less acidic than hydrogens alpha to carbonyl groups (such as in ketones or aldehydes), however.

GMA Network

GMA Network (Global Media Arts or simply GMA) is a major commercial television and radio network in the Philippines. GMA Network is owned by GMA Network Inc. a publicly listed company. Its first broadcast on television was on October 29, 1961, GMA Network (formerly known as DZBB TV Channel 7, RBS TV Channel 7, GMA Radio-Television Arts then GMA Rainbow Satellite Network) is commonly signified to as the "Kapuso Network" in reference to the outline of the company’s logo. It has also been called the “Christian Network” which refers to the apparent programming during the tenure of the new management, which took over in 1974. It is headquartered in the GMA Network Center in Quezon City and its transmitter is located at Tandang Sora Avenue, Barangay Culiat also in Quezon City.

The original meaning of the GMA acronym was Greater Manila Area, referring to the initial coverage area of the station. As the network expanded it changed into Global Media Arts. At present the corporate name is simply GMA Network Inc.

Khan Academy

Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.

History

The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.

In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.

Silent partner

Silent partner refers to an anonymous member of a business partnership, especially a limited partnership, or a partner who is not actively involved in the management of the business.

Silent partner may also refer to:

Media

24 Oras

24 Oras (24 Hours) is the flagship national network news broadcast of GMA Network. It is the nightly national newscast which airs in the Philippines on GMA and worldwide via GMA Pinoy TV. It is aired every weeknights from 6:30 PM to 7:45 PM, and every Saturdays and Sundays from 5:30 PM to 6:00 PM (PST). The newscast can be heard on radio through Super Radyo DZBB 594 in Mega Manila and several of its regional Super Radyo stations nationwide (Super Radyo 909 Palawan, Super Radyo 1323 Iloilo, Super Radyo 999 Cebu and Super Radyo 1125 Davao).

History

2004-2014

24 Oras premiered on March 15, 2004 at 6:15pm, replacing Frontpage: Ulat ni Mel Tiangco as the network's answer to longest-running newscast TV Patrol. Frontpage anchor Mel Tiangco was joined by Saksi's Mike Enriquez, rejoining them in one newscast since they co-anchored Saksi from 1996 to 1998. Special weekend editions are also being aired when it deemed necessary (See below). The show, meanwhile, transferred its timeslot from 6:15pm to 6:30pm, it was currently extended to 90 minutes.