Traducción y análisis de palabras por inteligencia artificial ChatGPT
En esta página puede obtener un análisis detallado de una palabra o frase, producido utilizando la mejor tecnología de inteligencia artificial hasta la fecha:
- cómo se usa la palabra
- frecuencia de uso
- se utiliza con más frecuencia en el habla oral o escrita
- opciones de traducción
- ejemplos de uso (varias frases con traducción)
- etimología
Qué (quién) es valid expression - definición
![DNA methylation is the addition of a [[methyl]] group to the DNA that happens at [[cytosine]]. The image shows a cytosine single ring base and a methyl group added on to the 5 carbon. In mammals, DNA methylation occurs almost exclusively at a cytosine that is followed by a [[guanine]].](https://commons.wikimedia.org/wiki/Special:FilePath/DNA methylation.svg?width=200 "DNA methylation is the addition of a [[methyl]] group to the DNA that happens at [[cytosine]]. The image shows a cytosine single ring base and a methyl group added on to the 5 carbon. In mammals, DNA methylation occurs almost exclusively at a cytosine that is followed by a [[guanine]].")
![hunchback]]. High intensity of blue color marks places with high hunchback mRNA quantity.](https://commons.wikimedia.org/wiki/Special:FilePath/Hunchback in situ.jpg?width=200 "hunchback]]. High intensity of blue color marks places with high hunchback mRNA quantity.")
![[[Neomycin]] is an example of a small molecule that reduces expression of all protein genes inevitably leading to cell death; it thus acts as an [[antibiotic]].](https://commons.wikimedia.org/wiki/Special:FilePath/Neomycin B C.svg?width=200 "[[Neomycin]] is an example of a small molecule that reduces expression of all protein genes inevitably leading to cell death; it thus acts as an [[antibiotic]].")
![transcription start site]] of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter and these proteins are joined to form a dimer (red zigzags). Specific regulatory [[transcription factor]]s bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as [[phosphorylation]] shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator (a complex consisting of about 26 proteins in an interacting structure) communicates regulatory signals from the enhancer DNA-bound transcription factors to the promoter.](https://commons.wikimedia.org/wiki/Special:FilePath/Regulation of transcription in mammals.jpg?width=200 "transcription start site]] of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter and these proteins are joined to form a dimer (red zigzags). Specific regulatory [[transcription factor]]s bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as [[phosphorylation]] shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator (a complex consisting of about 26 proteins in an interacting structure) communicates regulatory signals from the enhancer DNA-bound transcription factors to the promoter.")
![pigmentation]] genes in different areas of the [[skin]].](https://commons.wikimedia.org/wiki/Special:FilePath/Tortie-flame.jpg?width=200 "pigmentation]] genes in different areas of the [[skin]].")
Wikipedia
In temporal databases, valid time (VT) is the time period during which a database fact is valid in the modeled reality. As of December 2011, ISO/IEC 9075, Database Language SQL:2011 Part 2: SQL/Foundation included clauses in table definitions to define "application-time period tables" (that is, valid-time tables). Valid time was coined by Richard T. Snodgrass and his doctoral student.
In a database table valid time is often represented by two extra table-columns StartVT and EndVT. The time interval is closed at its lower bound and open at its upper bound.
Example:
Valid time is the time for which a fact is true in the real world. In the example above, the Person table gets two extra fields, Valid-From and Valid-To, specifying when a person's address was valid in the real world. On April 4, 1975, John's father proudly registered his son's birth. An official will then insert a new entry to the database stating that John lives in Smallville from April, 3rd. Notice that although the data was inserted on the 4th, the database states that the information is valid since the 3rd. The official does not yet know if or when John will ever move to a better place so in the database the Valid-To is filled with infinity (∞). Resulting in this entry in the database:
December 27, 1994 John reports his new address in Bigtown where he has been living since August 26, 1994. The Bigtown official does not change the address of the current entry of John Doe in the database. He adds a new one:
The original entry Person (John Doe, Smallville, 3-Apr-1975, ∞) is then updated (not removed!). Since it is now known that John stopped living in Smallville on August 26, 1994, the Valid-To entry can be filled in. The database now contains two entries for John Doe
When John dies the database is once more updated. The current entry will be updated stating that John does not live in Bigtown any longer. No new entry is being added because officials never report heaven as a new address. The database now looks like this
