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Sunday, April 13, 2014

Internet History

The Internet was the result of some visionary thinking by people in the early 1960s who saw great potential value in allowing computers to share information on research and development in scientific and military fields. 


1969

ARPA (Advanced Research Projects Agency) goes online in December, connecting four major U.S. universities. Designed for research, education, and government organizations, it provides a communications network linking the country in the event that a military attack destroys conventional communications systems.

1972

Electronic mail is introduced by Ray Tomlinson, a Cambridge, Mass., computer scientist. He uses the @ to distinguish between the sender's name and network name in the email address.

1973

Transmission Control Protocol/Internet Protocol (TCP/IP) is designed and in 1983 it becomes the standard for communicating between computers over the Internet. One of these protocols, FTP (File Transfer Protocol), allows users to log onto a remote computer, list the files on that computer, and download files from that computer.

1976

Presidential candidate Jimmy Carter and running mate Walter Mondale use email to plan campaign events.
Queen Elizabeth sends her first email. She's the first state leader to do so.

1982

The word “Internet” is used for the first time.

1984

Domain Name System (DNS) is established, with network addresses identified by extensions such as .com, .org, and .edu.
Writer William Gibson coins the term “cyberspace.”

1985

Quantum Computer Services, which later changes its name to America Online, debuts. It offers email, electronic bulletin boards, news, and other information.

1988

A virus called the Internet Worm temporarily shuts down about 10% of the world's Internet servers.

1989

The World (world.std.com) debuts as the first provider of dial-up Internet access for consumers.
Tim Berners-Lee of CERN (European Laboratory for Particle Physics) develops a new technique for distributing information on the Internet. He calls it the World Wide Web. The Web is based on hypertext, which permits the user to connect from one document to another at different sites on the Internet via hyperlinks (specially programmed words, phrases, buttons, or graphics). Unlike other Internet protocols, such as FTP and email, the Web is accessible through a graphical user interface.

1990

The first effort to index the Internet is created by Peter Deutsch at McGill University in Montreal, who devises Archie, an archive of FTP sites.

1991

Gopher, which provides point-and-click navigation, is created at the University of Minnesota and named after the school mascot. Gopher becomes the most popular interface for several years.
Another indexing system, WAIS (Wide Area Information Server), is developed by Brewster Kahle of Thinking Machines Corp.

1993

Mosaic is developed by Marc Andreeson at the National Center for Supercomputing Applications (NCSA). It becomes the dominant navigating system for the World Wide Web, which at this time accounts for merely 1% of all Internet traffic.

1994

The White House launches its website, www.whitehouse.gov.
Initial commerce sites are established and mass marketing campaigns are launched via email, introducing the term “spamming” to the Internet vocabulary.
Marc Andreessen and Jim Clark start Netscape Communications. They introduce the Navigator browser.

1995

CompuServe, America Online, and Prodigy start providing dial-up Internet access.
Sun Microsystems releases the Internet programming language called Java.
The Vatican launches its own website, www.vatican.va.

1996

Approximately 45 million people are using the Internet, with roughly 30 million of those in North America (United States and Canada), 9 million in Europe, and 6 million in Asia/Pacific (Australia, Japan, etc.). 43.2 million (44%) U.S. households own a personal computer, and 14 million of them are online.

1997

On July 8, 1997, Internet traffic records are broken as the NASA website broadcasts images taken by Pathfinder on Mars. The broadcast generates 46 million hits in one day.
The term “weblog” is coined. It’s later shortened to “blog.”

1998

Google opens its first office, in California.

1999

College student Shawn Fanning invents Napster, a computer application that allows users to swap music over the Internet.
The number of Internet users worldwide reaches 150 million by the beginning of 1999. More than 50% are from the United States. 
“E-commerce” becomes the new buzzword as Internet shopping rapidly spreads.
MySpace.com is launched.

2000

To the chagrin of the Internet population, deviant computer programmers begin designing and circulating viruses with greater frequency. “Love Bug” and “Stages” are two examples of self-replicating viruses that send themselves to people listed in a computer user's email address book. The heavy volume of email messages being sent and received forces many infected companies to temporarily shut down their clogged networks.
The Internet bubble bursts, as the fountain of investment capital dries up and the Nasdaq stock index plunges, causing the initial public offering (IPO) window to slam shut and many dotcoms to close their doors.
America Online buys Time Warner for $16 billion. It’s the biggest merger of all time.

2001

Napster is dealt a potentially fatal blow when the 9th U.S. Circuit Court of Appeals in San Francisco rules that the company is violating copyright laws and orders it to stop distributing copyrighted music. The file-swapping company says it is developing a subscription-based service. 
About 9.8 billion electronic messages are sent daily.
Wikipedia is created.

2002

As of January, 58.5% of the U.S. population (164.14 million people) uses the Internet. Worldwide there are 544.2 million users.
The death knell tolls for Napster after a bankruptcy judge ruled in September that German media giant Bertelsmann cannot buy the assets of troubled Napster Inc. The ruling prompts Konrad Hilbers, Napster CEO, to resign and lay off his staff.

2003

It's estimated that Internet users illegally download about 2.6 billion music files each month.
Spam, unsolicited email, becomes a server-clogging menace. It accounts for about half of all emails. In December, President Bush signs the Controlling the Assault of Non-Solicited Pornography and Marketing Act of 2003 (CAN-SPAM Act), which is intended to help individuals and businesses control the amount of unsolicited email they receive.
Apple Computer introduces Apple iTunes Music Store, which allows people to download songs for 99 cents each.
Spam, unsolicited email, becomes a server-clogging menace. It accounts for about half of all emails.
Apple Computer introduces Apple iTunes Music Store, which allows people to download songs for 99 cents each.

2004

Internet Worm, called MyDoom or Novarg, spreads through Internet servers. About 1 in 12 email messages are infected.
Online spending reaches a record high—$117 billion in 2004, a 26% increase over 2003.

2005

YouTube.com is launched.

2006

There are more than 92 million websites online.

2007

Legal online music downloads triple to 6.7 million downloads per week.
Colorado Rockies' computer system crashes when it receives 8.5 million hits within the first 90 minutes of World Series ticket sales.
The online game, World of Warcraft, hits a milestone when it surpasses 9 million subscribers worldwide in July.

2008

In a move to challenge Google's dominance of search and advertising on the Internet, software giant Microsoft offers to buy Yahoo for $44.6 billion.
In a San Fransisco federal district court, Judge Jeffrey S. White orders the disabling of Wikileaks.org, a Web site that discloses confidential information. The case was brought by Julius Baer Bank and Trust, located in the Cayman Islands, after a disgruntled ex-employee allegedly provided Wikileaks with stolen documents that implicate the bank in asset hiding, money laundering, and tax evasion. Many web communities, who see the ruling as unconstitutional, publicized alternate addresses for the site and distributed bank documents through their own networks. In response, Judge White issues another order to stop the distribution of bank documents.
Microsoft is fined $1.3 billion by the European Commission for further abusing its dominant market position, and failing to comply to their 2004 judgment, which ordered Microsoft to give competitors information necessary to operate with Windows. Since 2004, Microsoft has been fined a total of $2.5 billion by the Commission for not adhering to their ruling.


For more information on the internet history. Check these links out:

XML

Assalamualaikum <3 hello !

What is XML ?

  • XML stands for EXtensible Markup Language
  • XML is a markup language much like HTML
  • XML was designed to carry data, not to display data
  • XML tags are not predefined. You must define your own tags
  • XML is designed to be self-descriptive

What is the difference between XML and HTML ?


XML is not a replacement for HTML.
XML and HTML were designed with different goals:
  • XML was designed to transport and store data, with focus on what data is
  • HTML was designed to display data, with focus on how data looks
HTML is about displaying information, while XML is about carrying information.

   Differences Between HTML and XML

XML
HTML
Transport and store data
Display Data only
Focus on what data is
Focus on how data looks
Carry information
Display information
A framework for defining markup languages.
A markup language itself
Case sensitive
Case insensitive
Dynamic
Static
Neither a programming language nor a presentation language
A presentation language


XML TREE


     XML documents must contain a root element. This element is "the parent" of all other elements. The elements in an XML document form a document tree. The tree starts at the root and branches to the lowest level of the tree.

All elements can have sub elements (child elements):

 <root>
    <child>
       <subchild>.....</subchild>
    </child>
</root>

DIAGRAM FOR XML TREE(BOOKSTORE STORAGE)


Here is the XML text for the bookstore above :

<bookstore>
  <book category="COOKING">
    <title lang="en">Everyday Italian</title>
    <author>Giada De Laurentiis</author>
    <year>2005</year>
    <price>30.00</price>
  </book>
  <book category="CHILDREN">
    <title lang="en">Harry Potter</title>
    <author>J K. Rowling</author>
    <year>2005</year>
    <price>29.99</price>
  </book>
  <book category="WEB">
    <title lang="en">Learning XML</title>
    <author>Erik T. Ray</author>
    <year>2003</year>
    <price>39.95</price>
  </book>
</bookstore>


If you want to learn more efficient about this XML, just click on this LINK :)

Thank you, Wassalam :)

Wednesday, March 5, 2014

Protein Data Bank

What is Protein Data Bank (PDB)?

Biologists and biochemists use sequence databases, structure databases, literature databases, etc. The database we will learn here is called the Protein Database (PDB). The PDB has all known 3D structures of proteins, DNAs and RNAs. To find the PDB on the web, type ‘PDB’ into google, and go to the first link returned, which is http://www.rcsb.org/pdb/home/home.do

You need to download the protein structures (i.e., the PDB files) that you are going to study, to your own computer. Each structure is in a pdb file with a name that does not carry much information (for example 1H97.pdb). A PDB file is a simple text file with the xyz coordinates of all the atoms in the protein (one protein has lots and lots of atoms).

Search for the protein that you want to study, for example, Neuraminidase


Scroll down to find the specific protein


Download the file by clicking PDB File(text)




The data format that PDB use is macromolecular crystallographic information file (mmCIF). It been introduced in the late 1990's. As the result,PDB has been very useful for every kind of human being,especially scientist,lecturers and students. These are 5 examples of the proteins that have been downloaded:

1) Neuraminidase

2) ClpP


3) HtrA


4) Trypsin


5) Subtilisin



Name Neuraminidase ClpP HtrA Trypsin Subtilisin
Molecule Name
der Influenza-Neuraminidase-Teil 2
Escherichia coli
Putative serine protease
Erythrina Trypsin Inhibator
Serine endopeptidase
Classification
Hydrolase
Hydrolase
Protein binding
Proteinase Inhibator
Protease
Type
Protein
Protein
Protein
Protein
Protein
Length
388
193
134
172
269

Now, what software or program shall we use to open such file? This is when Rasmol comes into rescue!

What is RasMol ?
RasMol is a program for molecular graphics visualisation originally developed by Roger Sayle. This site is provided for the convenience of users of RasMol and developers of open source versions of Rasmol. It is a free program which displays molecular structure.
RasMol was designed for viewing protein structures -- molecules so large that one would not make an ordinary molecular model by hand. However, it can also be used for small molecules. Using RasMol for small molecules is particularly useful if you do not have a set of models. If you do have models, it may be good to learn to use RasMol with small molecules, and even compare the RasMol model with the "physical" models.
To get started with RasMol :

1. Open file of RasMol: File/Open from within RasMol. From within Netscape, click on a RasMol viewable molecule (a .pdb file). (RasMol should automatically start and load in the molecule.)



2. To select a molecule: Click on molecule name in the Molecules window (the secondary window)


3. To close a file (a molecule): File/Close when the molecule is selected.


The molecule displays on the screen.

Wednesday, February 19, 2014

chemsketch

Chemsketch is a most powerful program and easiest tool for drawing chemical structures, reactions, schematic diagrams and designing other chemistry-related reports and presentations. From April 1999 onward, Advanced Chemistry Development, Inc., (ACD/Labs) has been making ChemSketch available as freeware through the “Free Stuff” link at our Web site and it should be installed in its own separate folder... Thanks to them made it free. (before this you need to purchase it). Now we offer ACD/ChemSketch 8.0 for free! (newest version is ACD/Chemsketch 12.0). Make sure get the latest one..!!

All of the limitations on Freeware and also the Frequently Asked Questions (FAQs) can be found on web site at http://www.acdlabs.com/products/chem_dsn_lab/chemsketch/tech.html.you are encourage to visit the ChemSketch newsgroup at the address mentioned in the next section where you can post your questions or share tips.

The core capabilities of this program :-

-Drawing of Molecular Structure

-Structure Search

-Chemistry

-Reporting

-Enhanced Graphics

-Convenient Interface Design

Friday, February 14, 2014

Html

Assalamualaikum. Today we are going to share about HTML code. What is HTML ? Basically, HTML is a language for describing web pages. HTML stands for Hyper Text Markup Language. It is also known as markup language. Markup language is a set of markup tags. Then, the tags describe document content. In addition, HTML documents contain HTML tags and plain text. It is also called as web pages. Okay here we will explain briefly about HTML Tags. HTML tags are keywords (tag names) surrounded by angle brackets like . It is normally come in pairs like and . The first tag in a pair is known as start tag, then the second tag is known as end tag. The end tag is written like the start tag, with a forward slash before the tag name. Start tags is called as OPENING TAGS while end tags is called as CLOSING TAGS. Besides, do you even know about the HTML elements? “HTML elements” and “HTML tags” are often used to describe the same thing. But an HTML element is everything between the start tag and the end tag, including the tags: HTML element:

This is a paragraph.
<p> = start tag
</p> = end tag

What we learn today is the basic of how to create HTML code.

Step 1: open a application named NOTEPAD.


Step 2: write the code.


Step 3: save the document as HTML document.


Step 4: Open the folder where you save the code and click on the document you just saved.


Then a window will appear.The code that you create will show what should appear on the window.for example,if you type the code below you will see a table appears on the window.

For example:

<html>
<body>

<table border="1" style="width:300px">
<tr>
<td>Jill</td>
<td>Smith</td> <td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
</table>

</body>
</html>

The outcome will be:


Jill Smith 50
Eve Jackson 94


Try it yourself :)
For further infos on this, try http://www.w3schools.com/html/html_tables.asp
Goodluck!

Wednesday, February 5, 2014

Concept in Physics

Physical Quantities

1. A physical quantity is a quantity that can be measured.
2. A physical quantity can be divided into base quantity and derived quantity.

Base Quantities

1. Base quantities are the quantities that are conventionally accepted as functionally
    independent of one another.
2. It is a quantity that cannot be defined in term of other physical quantity.
3. The base quantities and its units are as in the table below:

Quantity Name of Unit Unit symbol
Length metre m
Mass kilogram kg
Time second s
Electic current ampere A
Temperature Kelvin K


Derived Quantities

A derived quantity is a Physics quantity that is not a base quantity. It is the quantities which derived from the base quantities through multiplying and/or dividing them.
For example:



Derived Unit

The derived unit is a combination of base units through multiplying and/or dividing them.



Prefixes

Prefixes are the preceding factor used to represent very small and very large physical quantities in SI units.




Click these links! Check them out:

http://physics.nist.gov/cuu/Units/units.html
http://physics.nist.gov/Pubs/SP811/sec04.html