Fluorescent Specimen Dark State Detection via Variable Illumination Volume
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Solution Overview
Problem
The occurrence of dark states, or 'blinking,' in fluorescent proteins during spectroscopic or microscopic examinations of biological specimens makes it difficult to distinguish between actual diffusion and dark states, especially when time constants overlap with diffusion times.
Innovation Solution
Varying the excitation/illumination volume over multiple measurements allows differentiation between dark states and diffusion by observing changes in time constants, using a device with a light source, detector, and adjustable diaphragms to control the illumination beam path, ensuring that unchanged time constants indicate a dark state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the excitation/illumination volume is increased to improve observation of fluorescent specimens, then the residence time of fluorescent proteins increases and diffusion effects become more pronounced, but it becomes impossible to distinguish between dark states and diffusion phenomena when time constants overlap
Solution Approach 1:
The patent applies dynamics by making the excitation/illumination volume variable rather than fixed. The system dynamically adjusts the illumination volume size and performs multiple measurements at different volume settings. This dynamic approach allows the residence time to be controlled and varied, enabling the differentiation of dark states from diffusion phenomena through comparative analysis of time constants across different volume conditions.
Solution Approach 2:
The patent employs parameter changes by systematically varying the excitation/illumination volume as a key parameter. By changing this parameter and observing how the time constants behave under different volume conditions, the method enables distinction between dark states (which show unchanged time constants) and diffusion (which shows volume-dependent time constant changes).
2Measurement precision
If multiple measurements are performed with varied excitation volumes to differentiate dark states from diffusion, then measurement precision improves, but measurement time and experimental complexity increase
Solution Approach 1:
The patent applies partial action by performing a limited number of measurements at different excitation volumes rather than continuous monitoring. This selective approach captures sufficient information to differentiate dark states from diffusion while avoiding excessive measurement time. The method uses just enough varied volume conditions to obtain the necessary comparative data.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables accurate differentiation between dark states and diffusion processes, enhancing the ability to analyze biological specimens by varying the excitation/illumination volume, thereby distinguishing between intrinsic fluorophore properties and diffusion phenomena.
Implementation Method 1
spectroscopic or microscopic examination of fluorescent specimens, in particular using fluorescent proteins
Implementation Method 2
a light source and a detector device, an illumination beam path extending between the light source and the specimen, and a detection beam path extending between the specimen and the detector device
Data Source
AI summary
A method for recognizing dark states during the spectroscopic or microscopic examination of fluorescent specimens includes varying an intensity distribution of excitation light by varying an excitation/illumination volume over a plurality of mutually independent measurements. A determination is made as to whether observed time constants change between the measurements. The existence of a dark state is inferred where the observed time constants are unchanged between the measurements.