Different search engines for
nucleotides and proteins
Submitted by:
Abida Bibi
Submitted to:
Ms. Sara Junaid
Date of submission:
6 st March, 2020
Subject:
Genome analysis and genomics
Dept. of Microbiology and Molecular Genetics
The Women University, Multan
, Different search engines for nucleotides
and proteins
Definition of search engine:
“A program that searches for and identifies items in a database that correspond to keywords or
characters specified by the user, used especially for finding particular sites on the World Wide
Web.”
OR
“Search engine find the results based on the search (key word) in their database, sort them and
make an ordered list of these results.”
Working principle of search engines:
All king of search engines works in three steps while finding a query given by searcher:
1. Crawling
2. Indexing
3. Ranking
1. Crawling: Crawling is the discovery process in which search engine send out team of
robots to find new and updated content on a webpage. Googlebot starts out by fetching a
few web pages, and then follows the links on those webpages to find new URLs. Then
these URLs are maintained and updated. So that when searcher find for it, it could be
easily retrieved.
2. Indexing: Search engines process and store information they find in an index, a huge
database of all the content they’ve discovered. They maintain all databases in their index
list to serve the searcher in easiest way.
3. Ranking: When someone performs a search, search engines sort out their index for
highly relevant content and then orders that content according to the searchers query.
This ordering of search results by relevance is known as ranking. When a searcher enters
his query on engine. Search engine will rank it by relevance, the most highly ranked
website at that time will be showing most relevance with the query of the searcher.
nucleotides and proteins
Submitted by:
Abida Bibi
Submitted to:
Ms. Sara Junaid
Date of submission:
6 st March, 2020
Subject:
Genome analysis and genomics
Dept. of Microbiology and Molecular Genetics
The Women University, Multan
, Different search engines for nucleotides
and proteins
Definition of search engine:
“A program that searches for and identifies items in a database that correspond to keywords or
characters specified by the user, used especially for finding particular sites on the World Wide
Web.”
OR
“Search engine find the results based on the search (key word) in their database, sort them and
make an ordered list of these results.”
Working principle of search engines:
All king of search engines works in three steps while finding a query given by searcher:
1. Crawling
2. Indexing
3. Ranking
1. Crawling: Crawling is the discovery process in which search engine send out team of
robots to find new and updated content on a webpage. Googlebot starts out by fetching a
few web pages, and then follows the links on those webpages to find new URLs. Then
these URLs are maintained and updated. So that when searcher find for it, it could be
easily retrieved.
2. Indexing: Search engines process and store information they find in an index, a huge
database of all the content they’ve discovered. They maintain all databases in their index
list to serve the searcher in easiest way.
3. Ranking: When someone performs a search, search engines sort out their index for
highly relevant content and then orders that content according to the searchers query.
This ordering of search results by relevance is known as ranking. When a searcher enters
his query on engine. Search engine will rank it by relevance, the most highly ranked
website at that time will be showing most relevance with the query of the searcher.
