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Codes and circuits
1National Institute of Child Health and Human Development, The National Institutes of Health, Bethesda, MD, USA. nelsonp@mail.nih.gov
Cellular and Molecular Neurobiology
|March 31, 2011
Summary
Marshall Nirenberg
Area of Science:
- Neurobiology
- Molecular Biology
- Genetics
Background:
- Marshall Nirenberg's legacy includes deciphering the genetic code.
- Nirenberg shifted to neurobiology, exploring a potential neural code for brain function.
- Neural cell adhesion molecules are implicated in neural circuit formation.
Discussion:
- This review examines neural cell adhesion molecules involved in neural circuit development.
- Focuses on the role of presynaptic neurexins and postsynaptic neuroligins.
- Their specific binding may form part of the neural code for synaptic circuit assembly.
Key Insights:
- Neurexin-neuroligin binding is a potential component of the neural code.
- This interaction is crucial for the formation of specific synaptic circuits.
- Highlights the molecular basis of neural circuit development.
Outlook:
- Further research into neurexin-neuroligin interactions can elucidate neural coding.
- Understanding these molecules may reveal mechanisms underlying brain function.
- Potential implications for neurodevelopmental disorders and brain repair.
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An electrical network is a system composed of interconnected elements, such as resistors, capacitors, inductors, and voltage or current sources. Unlike a circuit, an electrical network does not necessarily form a closed path. In other words, while all circuits can be considered networks due to their interconnected nature, not every network qualifies as a circuit.
A circuit, on the other hand, is also an interconnected system of electrical elements but must contain one or more closed paths.
A circuit, on the other hand, is also an interconnected system of electrical elements but must contain one or more closed paths.
First-Order Circuits
First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
One common example of a first-order circuit is the RC (resistor-capacitor) circuit. These circuits are used in relaxation oscillators such as neon lamp oscillator circuits. When voltage is...
One common example of a first-order circuit is the RC (resistor-capacitor) circuit. These circuits are used in relaxation oscillators such as neon lamp oscillator circuits. When voltage is...
Linear Circuits
A linear circuit is characterized by its output having a direct proportionality to its input, adhering to the linearity property, which encompasses the principles of homogeneity (scaling) and additivity. Homogeneity dictates that when the input, also referred to as the excitation, is multiplied by a constant factor, the output, known as the response, is correspondingly scaled by the same constant factor. For instance, if the current is multiplied by a constant 'k,' the voltage likewise...
Electric Circuit Elements
Circuit elements are the basic building blocks of an electric circuit. Essentially, an electric circuit is the interconnection of these elements. Within electric circuits, one can find two types of elements: passive and active. Active elements have the ability to generate energy, whereas passive elements do not. Passive elements include components like resistors, capacitors, and inductors, while active elements typically encompass generators, batteries, and operational amplifiers.
The most...
The most...
Second-Order Circuits
Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...
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A relaxation oscillator is one of the applications of RC circuits. A neon lamp relaxation oscillator comprises a capacitor, a resistor, a voltage source, and a lamp. The lamp acts like an open circuit, with infinite resistance until the potential difference across the lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit with zero resistance, and the capacitor discharges through the lamp, thus producing light. Once the capacitor is fully discharged through the...

