Definition LAB

XML comes from the eXtensible Markup Language ( " Extensible Markup Language " ). It is an extensible metalanguage (a language used to say something about another) of tags that was developed by the Word Wide Web Consortium ( W3C ), an international trading company that makes recommendations for the World Wide Web . XML is an adaptation of SGML ( Standard Generalized Markup Language ), a language that allows the organization and tagging of documents . This means that XML is not a language in itself, but a system that allows defining languages ​​according to needs. The XHTML , the MathML and SVG are some of the languages that XML has the ability to define. Databases, text documents, spreadsheets and web pages are some of the fields of application of XML. The metalanguage appears as a standard that structures the exchange of information between the different platforms. Experts point out several advantages that derive from the use of XML, such as: it is extensible (new t...

Xylophone is the name of an instrument of music which, by its nature, is part of the so - called percussion instruments . It consists of different plates located horizontally that, when hit with sticks , emit different sounds according to their tuning. The various blades of the xylophone therefore sound in different pitches (  that is, with different musical notes  ). The organization of the pictures can be compared to the organization of the keys of a piano. Also called a xylophone , this instrument has wooden blades . Therefore, its notes have a shorter duration when compared to the notes provided by instruments with metal plates, such as the metallophone . This is because wood sheets have a lower vibration than metal sheets. According to size, it is possible to differentiate between the bass xylophone , the tall xylophone and the soprano xylophone . Larger xylophones can make about 48 different note . Many symphony orchestras use xylophones. The person playing the xy...

Xylophago is an adjective that is used in the field of zoology to describe insects that feed on wood . There are animals of different orders that include wood in their diet. While there are insects that feed according to the type of plant, others choose the wood based on the characteristics it presents (its conservation, hardness, if it has fungi, etc.). The digestion of food also develops in different ways according to the species in question. There are xylophagous insects that have cellulase , an enzyme that enables the decomposition of cellulose and its transformation into glucose . Others can develop the processing of cellulose through the bacteria that they harbor in their digestive system . The Isoptera , in colloquial language known as termites , are an example typical of xylophagous animals. These insects eat wood to obtain the cellulose that they decompose through the action of protozoa , organisms with which they maintain a symbiotic relationship. Termites are frequent ...

The first thing we are going to do in order to know the meaning of the term xylem is to establish its etymological origin. In this sense, we can say that it is a word that derives from the Greek, specifically, from the word “xylon”, which can be translated as “wood”. The notion of xylem is used in the field of botany to name the tissue type leñoso that present in some plants, it has the function of moving minerals and water to different parts of the body. The xylem is a tissue that has a high amount of lignin , a substance that contributes to the thickening of the stem. In the xylem, it is possible to recognize different elements, such as tracheids (a class of cell that conducts raw sap , the name of the fluid that carries xylem) and pits (sectors that favor cell communication). The functions of the xylem are conduction and support . As for driving, it is the most important purpose of this fabric. Its mission is to carry the raw sap from the root to the rest of the plant . This ...

XHTML is an acronym of the English language that comes from the Extensible Hypertext Markup Language expression . In our language , this phrase can be translated as Understood Hypertext Markup Language . These ideas belong to the field of computing and are specifically linked to the Internet . The XHTML is a language that adapts the HTML to the XML. In other words: it is an adaptation of the HTML language to be compatible with the XML language. As you can see, to know what XHTML is, it is necessary to understand what the concepts of HTML and XML refer to. The HTML is the language derived from the SGML , is used for creating web pages. Through this markup language, designers indicate how pages are developed. What the browsers that users use, such as Mozilla Firefox , Google Chrome or Internet Explorer , do is interpret this content developed in HTML and display it in such a way that people can interpret it (such as text, images, etc.). The XML also derived from the SGML and is...

The adjective xerophilous is used to describe the plant that is adapted to living in a dry environment . A xerophytic plant, therefore, is able to subsist by receiving a very limited amount of water. Xerophilic plants are found in arid , semi-arid , and sub-humid climates . These organisms can generally be seen in desert regions or on the steppe . Xerophilous vegetables have characteristics suitable for life with a shortage of water . For this reason, its trunk tends to be wide to favor the storage of liquid and its roots are long to reach the water table and improve the use of rain. Another peculiarity of xerophilic plants is that their metabolism is conditioned to carry out photosynthesis , saving water. It also allows them to have good resistance to drought. It is possible to find xerophilous vegetation in the Atacama desert , for example. Yaretas (or llaretas), cachiyuyos and carob trees are some of the species present in this area of Chile . The Mojave Desert in the United St...

 The term xenophobia comes from the Greek concept composed of xénos ( " foreigner " ) and phóbos ( " fear " ). Xenophobia, therefore, refers to hatred , suspicion , hostility and rejection of foreigners . The word is also often used in an extended way as a phobia towards different ethnic groups or towards people whose social, cultural and political appearance is unknown. Xenophobia is an ideology that consists of the rejection of cultural identities that are different from one's own. Unlike racism , xenophobia proposes accepting foreigners and immigrants, as long as their sociocultural assimilation is fulfilled. It can be said that this type of discrimination is based on different historical , religious , cultural and national prejudices , which lead the xenophobe to justify the segregation between different ethnic groups in order not to lose their own identity. On the other hand, many times an economic prejudice is added that considers immigrants as a comp...

Xenocentrism is called the tendency that consists of privileging the ideas , customs and creations of a culture that is not one's own . It is the opposite of ethnocentrism , which implies placing one's culture in a position of superiority over the rest. There are various reasons for xenocentrism. Sometimes it appears as a way of rebelling against society , when the person chooses the cultural manifestations of a foreign community as an opposition. Xenocentrism can also be due to political motives or family roots . It is possible to detect xenocentrism in those consumers who opt for foreign products instead of those produced in their country . Even when local goods are better in terms of functionality and quality or more convenient in terms of price, xenocentrism leads to a preference for foreign goods. Suppose a man chooses to buy imported fruits . He does not care that there are local producers a few kilometers from his home. Although you can buy the same fruit cheaper, ...

The notion of xenobiotic is formed from two Greek words: xeno (which can be translated as " strange " ) and bio (linked to " life " ). The concept, in this way, refers to those compounds that have a chemical structure that does not exist in nature , but has been developed by man in a laboratory . Xenobiotics, therefore, are synthetic compounds . It can be said that they are chemical products that humans manufacture for different purposes: they can be treated from pesticides to drugs used for therapeutic purposes. In short, xenobiotics are chemical compounds that do not belong to the natural composition of living organisms. Although xenobiotics can degrade through oxidation or solar radiation , for example, their unusual characteristics mean that, in some cases, they remain unchanged for very long periods. Therefore, given the impossibility of biodegradation, many xenobiotics are highly polluting . It is important to bear in mind that xenobiotics usually generate ...