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In the 1990s, while other CAD software had been acquired by other companies, AutoCAD continued to be developed. The software was subsequently released as a native component of the AutoCAD and Inventor family of products. After acquiring AutoCAD in 1992, Autodesk made it available for free to all customers of their other software.
In 2009, Autodesk purchased a minority share in GIS software vendor ESRI, who had developed a GIS-specific version of AutoCAD, AutoCAD LT, under license from Autodesk, which is also available for free. This version was launched in August 2011.
Features of AutoCAD
Structure
AutoCAD is a multi-user CAD program for creating 2D and 3D drawings. It uses a model-based approach for its design and drafting work. That means that while an object may be three-dimensional in itself, it is represented by a two-dimensional drawing model.
First, the user selects a shape, color, linetype, and lineweight, for the model. When the CAD software is run, the user creates the model by entering coordinates into a drawing area, with the program responding by drawing lines and circles automatically, while the user can create filled polygons, regions, and freeform shapes, which may be combined into larger drawings.
From there, the user draws with an adjustable pen, plot points and lines, and define features such as holes, dimensions, or other attributes. When drafting the model, objects are built up layer by layer. The layers appear on the screen in a cascading fashion, from bottom to top. The user can navigate among the layers as well as within individual layers.
As the user draws the model, the program stores information about it in the drawing database, and it stores a number of history settings. The user can revise the model, or add new models, at any time.
Design
Once the model is complete, the user can enter design information, and the design is then recalculated by the CAD software to show how the model will look in real life.
A window lists all layers and drawings, with an item in each column representing an element in the design. For example, a wireframe drawing is represented by a small check mark in a cell. When the user makes changes to the design, the software recalculates the design so that these check marks
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See also 
 List of 2D CAD software
 List of 3D CAD software
 List of CAD file formats
 List of vector graphics editors
 Notes 
 References 
 External links 
AutoCAD home page
Autodesk Exchange Apps
Articles
Autodesk AutoCAD Guide 
Autodesk AutoCAD Applications 
Autodesk's CAD Collections
AutoCAD User's Forum
Autodesk Exchange Apps
Displaying Drawing Objects – Detailed documentation of importing and exporting formats
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Category:Computer-aided design software for Linux[Advance in molecular imaging of the central nervous system].
Molecular imaging with PET (positron emission tomography) is a powerful tool for the non-invasive study of biological function and for early diagnosis of diseases in the central nervous system. This article reviews the recent progress in the use of molecular imaging techniques in the central nervous system, with emphasis on the use of PET, as well as some findings that have been reported for in vivo molecular imaging. In addition, the potential of these techniques in the central nervous system are discussed.Clinical impact of pro-BDNF and anti-BDNF in non-cholinergic septal neurons in psychiatric disorders.
Brain-derived neurotrophic factor (BDNF) is an important regulator of neuroplasticity, both under normal and pathological conditions. Previously, we reported that septal cholinergic non-cholinergic neurons (cholinergic-NCh neurons) express BDNF and the transcription factor TrkB. Additionally, we showed that BDNF is essential for the cholinergic-NCh neurons in emotional learning. In the present study, we evaluated whether septal cholinergic-NCh neurons express BDNF/TrkB system in three psychiatric disorders, schizophrenia (SZ), bipolar affective disorder (BAD), and major depressive disorder (MDD). We observed that septal cholinergic-NCh neurons express BDNF/TrkB in SZ and BAD but not in MDD, suggesting that cholinergic-NCh neurons are under a different excitatory and inhibitory regulation in SZ and BAD as compared to MDD. In addition
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