Density Based Clustering
Density Based Clustering - Related Videos
10:37
Spatial Separation of Molecular Conformers and Clusters
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Cited by 3 •
2014
We present a technique that allows the spatial separation of different conformers or clusters present in a molecular beam. An electrostatic deflector is used to separate species by their mass-to-dipole moment ratio, leading to the production of gas-phase ensembles of a single conformer or cluster stoichiometry.
12:27
Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations
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Cited by 3 •
2017
This protocol describes large-scale reconstructions of selective neuronal populations, labeled following retrograde infection with a modified rabies virus expressing fluorescent markers, and independent, unbiased cluster analyses that enable comprehensive characterization of morphological metrics among distinct neuronal subclasses.
06:59
High-density EEG Recordings of the Freely Moving Mice using Polyimide-based Microelectrode
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Cited by 33 •
2011
In this article, we described the surgery procedure and handling tips for implantation of ultra-thin polyimide-based microelectrode array (PBM-array) on the mouse skull for acquisition of high-density encephalography (EEG) in a mouse model.
08:41
Differentiation of Human Pluripotent Stem Cells into Insulin-Producing Islet Clusters
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Cited by 2 •
2023
The differentiation of stem cells into islet cells provides an alternative solution to conventional diabetes treatment and disease modeling. We describe a detailed stem cell culture protocol that combines a commercial differentiation kit with a previously validated method to aid in producing insulin-secreting, stem cell-derived islets in a dish.
08:42
Density Gradient Ultracentrifugation
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2023
Density gradient ultracentrifugation is a common technique used to isolate and purify biomolecules and cell structures. This technique exploits the fact that, in suspension, particles that are more dense than the solvent will sediment, while those that are less dense will float. A high-speed ultracentrifuge is used to accelerate this process in order to separate biomolecules within a density gradient, which can be established by layering liquids of decreasing density in a centrifuge tube. The...
FAQs
The neighborhood distance determines how close data points must be to influence one another, while the required neighbor density determines whether a region is sufficiently populated to support a cluster. Changing either condition can alter which points connect, which groups expand, and which observations become noise. These settings therefore strongly affect the biological patterns identified from measurements or imaging features.
Cluster expansion occurs when points are connected through a sequence of sufficiently dense neighborhoods, rather than only through direct proximity to a single central point. This density-connected structure allows the method to follow extended or irregular data distributions. In bioengineering datasets, that behavior can preserve meaningful organization when biological groups do not form compact, uniformly shaped regions.
Observations in regions without enough nearby neighbors do not satisfy the method’s density requirement, so they remain separate from the main clusters. This classification helps distinguish concentrated biological patterns from unusual or weakly supported measurements. The resulting noise assignments can support anomaly review and quality-control decisions without forcing every observation into a biological group.
The method does not require predefined labels or a fixed number of clusters, and it can identify groups with irregular shapes. That combination is valuable when the structure of a biological dataset is uncertain before analysis. Instead of imposing an expected organization, the method uses observed neighborhood concentration to reveal candidate patterns and separate sparse observations.
A typical workflow establishes the neighborhood distance and the density requirement, evaluates nearby observations, identifies sufficiently concentrated regions, and expands groups through density-connected points. Observations that do not meet these conditions are classified as noise or outliers. The resulting clusters can then be examined in relation to the original cell, imaging, biomolecular, or sensor measurements.
Density Based Clustering can be applied to complex datasets containing cell measurements, imaging features, biomolecular profiles, and sensor outputs. These data sources may contain heterogeneous patterns that are difficult to organize with predefined categories. By examining local concentration, the method can help expose structure across measurements while retaining sparse observations for separate interpretation.
In cell-type studies, clusters can organize measurements that share similar local structure, supporting the identification of candidate cell groups. For disease-pattern analysis, concentrated regions in biological or biomedical features may reveal recurring patterns, while sparse points can flag observations requiring further attention. The approach therefore supports exploratory interpretation without assuming labels in advance.
Quality control can use the method’s separation of dense groups from sparse observations to identify measurements that do not resemble the dominant data structure. Such points may represent unusual biological states, inconsistent imaging features, or sensor outputs needing review, although the clustering result does not by itself establish the cause. This makes noise detection a useful screening step for heterogeneous systems.