Direct Imaging
Direct Imaging - Related Videos
13:35
Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging
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Cited by 63 •
2014
Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation technique. It has successfully been used in basic research and clinical settings to modulate brain function in humans. This article describes the implementation of tDCS and simultaneous functional magnetic resonance imaging (fMRI), to investigate the neural basis of tDCS effects.
07:41
Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
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Cited by 1 •
2016
Here we present a reliable method to monitor the incorporation of nanoparticles into a polymer host matrix via swell encapsulation. We show that the surface concentration of cadmium selenide quantum dots can be accurately visualized through cross-sectional fluorescence imaging.
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Cited by 5 •
2017
We present a protocol for creating a real-time movie of a molecular rotational wave packet using a high-resolution Coulomb explosion imaging setup.
09:32
Direct Imaging of ER Calcium with Targeted-Esterase Induced Dye Loading (TED)
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Cited by 60 •
2013
Targeted-esterase induced dye loading (TED) supports the analysis of intracellular calcium store dynamics by fluorescence imaging. The method bases on targeting of a recombinant Carboxylesterase to the endoplasmic reticulum (ER), where it improves the local unmasking of synthetic low-affinity Ca2+ indicator dyes in the ER lumen.
01:09
Directing Effect of Substituents: meta-Directing Groups
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2025
Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the ortho, meta, and para...
FAQs
The image forms when illumination or an electron beam interacts with the specimen and a detector records the resulting transmitted, reflected, or emitted signal. Differences in these signals create spatial patterns that reveal structure and change. This signal-to-image pathway matters because it preserves where features occur, allowing biological observations to retain spatial context rather than relying only on indirect measurements.
Contrast can arise from the specimen’s natural properties or from applied labels that alter the recorded signal. Natural contrast can show structural features without added markers, while labels can make selected biological components easier to localize. The choice affects whether an experiment emphasizes overall morphology, molecular positioning, or relationships between visible structures.
Direct Imaging shows the spatial arrangement of structures, cells, tissues, or organisms, whereas indirect measurements do not themselves provide the same visual context. This distinction is important when location, shape, organization, or visible change influences interpretation. Imaging therefore complements molecular and biochemical methods instead of replacing the information those approaches provide.
A typical workflow begins by presenting the specimen to illumination or an electron beam, allowing the interaction to generate transmitted, reflected, or emitted signals. A detector then records those signals and forms an image for analysis. The resulting data can be examined for morphology, molecular localization, tissue organization, or changes occurring over time.
Direct Imaging is useful when researchers need to examine cell morphology, locate molecular components, or study how tissues are organized. It also supports real-time observation of dynamic biological processes, making visible changes that may be missed by measurements collected without spatial information. These applications connect observable structure with biological interpretation.
Images can provide evidence about the shape and arrangement of cells, the organization of tissues, the locations of labeled or naturally contrasting components, and visible changes during a process. Interpreting these features in their spatial setting strengthens conclusions drawn from molecular or biochemical measurements and helps relate biological activity to physical organization.