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Autonomic Nervous System01:22

Autonomic Nervous System

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
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Autonomic Nervous System: Overview01:26

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The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS contains nerve cells, clusters of nerve cells, and the sensory receptors that are outside the CNS. The PNS has two types of nerve cells: sensory (afferent) and motor (efferent). Sensory cells send signals to the CNS from receptors, and motor cells carry signals from the CNS to organs, muscles, and...
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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating...
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Drugs Acting on Autonomic Ganglia: Blockers01:28

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Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups:
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Local Attraction01:22

Local Attraction

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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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Highly Resolved Intravital Striped-illumination Microscopy of Germinal Centers
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Autonomous illumination control for localization microscopy.

Marcel Štefko, Baptiste Ottino, Kyle M Douglass

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    This study introduces an automated illumination control system for super-resolution microscopy. The system uses a self-tuning controller and deep learning to optimize image acquisition without prior sample knowledge, enhancing throughput and resolution.

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    Area of Science:

    • Biophysics
    • Microscopy
    • Computational Biology

    Background:

    • Super-resolution fluorescence microscopy offers enhanced spatial resolution but faces challenges with image throughput and parameter optimization.
    • Current automation requires user expertise and sample-specific knowledge, limiting broad applicability.

    Purpose of the Study:

    • To develop a sample-independent, automated illumination control system for localization microscopy.
    • To overcome the limitations of manual parameter tuning and improve image acquisition efficiency.

    Main Methods:

    • Development of a flexible illumination control system with two key components: a self-tuning controller and a deep learning-based molecule density estimator.
    • The system operates without requiring a priori sample information.

    Main Results:

    • The developed system demonstrates accurate molecule density estimation across a wide range of densities.
    • The autonomous control system effectively obviates the need for manual parameter fine-tuning.
    • Robust and efficient illumination control for localization microscopy was achieved.

    Conclusions:

    • The novel automated system enables robust, sample-independent illumination control for super-resolution microscopy.
    • This advancement can significantly improve image throughput and accessibility of advanced microscopy techniques.