Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.


thymine (thīˈmēn), organic base of the pyrimidine family. Thymine was the first pyrimidine to be purified from a natural source, having been isolated from calf thymus and beef spleen in 1893–94. The accepted structure of the thymine molecule was published in 1900; this structure was confirmed when several investigators reported the synthesis of the compound during the period 1901 to 1910. Combined with the sugar deoxyribose in a glycosidic linkage, thymine forms a derivative called thymidine (a nucleoside), which in turn can be phosphorylated with from one to three phosphoric acid groups, yielding respectively the three nucleotides TMP (thymidine monophosphate), TDP (thymidine diphosphate), and TTP (thymidine triphosphate). The analogous nucleosides and nucleotides formed from thymine and ribose occur only very rarely in living systems; such is not the case with the other pyrimidines. The nucleotide derivatives of thymine do not exhibit as much activity as coenzymes, although TTP can readily donate one of its phosphate groups to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP), an extremely important intermediate in the transfer of chemical energy in living systems. Since the thymine nucleotides contain only deoxyribose and not ribose, TTP is the source of thymidine only in deoxyribonucleic acid (DNA); there is no thymine in ribonucleic acid (RNA). Thymidine is significant because of its involvement in the biosynthesis of DNA and in the preservation and transfer of genetic information. See nucleic acid.
The Columbia Electronic Encyclopedia™ Copyright © 2022, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


(Thermal Design Power) The amount of thermal energy in watts that a cooling system must dissipate from a computer's CPU. The TDP is provided by the chip manufacturer to the system vendor, which is expected to build a case that accommodates the chip's thermal requirements.

The TDP for a laptop CPU is greater than a desktop computer because there is less space for air to circulate inside a laptop case. Effective photo and video editing require high-performance CPUs and a higher TDP.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
KCR defended his presence at the wedding saying late Paritala Ravindra was his close friend from the days when he (KCR) was general secretary of TDP in-charge of Anantapur district and attended the wedding as the family had personally invited him.
Hence BJP might be deputing another senior leader to settle the hard bargaining with TDP.
In terms of party branding, the BJP comes in second place after the TRS in Telangana while the TDP comes second in Seemandhara.
Responding to the ruckus created by the TDP MLAs over Polavaram issue, Reddy said, "Why TDP members are creating nuisance on Polavaram?
But TDP leader and minister Akhila Priya said YSRCP workers were responsible for the violence as they had attacked the TDP leader.
Sridevi claimed that TDP leaders passed on comments such as, "Lord Ganesha will become 'impure' if Sridevi, a Dalit woman, touches the Lord."
The TDP is NGCP's road map, updated annually, for the continuous expansion of the Philippine grid, detailing all ongoing and future undertakings of the company, including all Energy Regulatory Commission-approved projects, affected areas, significant milestones and expected completion dates.
M Narasimhlu, a senior TDP leader in Telangana, lashed out at the TDP President and Andhra Pradesh Chief Minister N Chandrababu Naidu alleging that he had destroyed the NTR family.
If a landlord has not protected the deposit using a TDP scheme, you can claim compensation.
Under what conditions can ownership of a TDP reduce the price the government pays for production?
5 on the ground floor of Parliament has been occupied by the TDP for almost three decades.