Twin Studies
Twin Studies - Related Videos
06:30
Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM
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Cited by 2 •
2017
Here, we present a protocol for a mosaic labeling technique that permits the visualization of neurons derived from a common progenitor cell in two distinct colors. This facilitates neural lineage analysis with the capability of birth-dating individual neurons and studying gene function in the same neurons of different individuals.
09:04
Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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2011
Vascular mapping of monochorionic (MC) twin placentas after birth provides a means for detailed demonstration of vascular connections between the twins’ circulations. Imbalance of these connections is thought to play a pivotal role in the development of complications of MC twinning including twin-to-twin transfusion syndrome.
18:27
One-step Purification of Twin-Strep-tagged Proteins and Their Complexes on Strep-Tactin Resin Cross-linked With Bis(sulfosuccinimidyl) Suberate (BS3)
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Cited by 12 •
2014
A method is described for efficient purification of twin-Strep-tagged fusion proteins and their specific complexes on modified streptavidin (Strep-Tactin) resin covalently cross-linked with Bis(sulfosuccinimidyl) suberate (BS3). The method has the advantages of fast speed, good target protein recovery and high purity, and is compatible with subsequent analysis by mass spectrometry.
07:21
Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Cited by 14 •
2021
A versatile twin-screw extrusion process to provide an efficient thermo-mechano-chemical pretreatment on lignocellulosic biomass was developed, which leads to an increased average fiber aspect ratio. A natural binder can also be added continuously after fiber refining, leading to bio-based fiberboards with improved mechanical properties after hot pressing of the obtained extruded material.
07:30
Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor
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Cited by 20 •
2016
A procedure for thermochemical conversion of biomass residues is presented that aims at maximizing the yield of liquid products (fast pyrolysis). It is based on a technology proven on an industrial scale and especially suitable for treating a straw type of biomass.
FAQs
Interpretation depends partly on whether monozygotic and dizygotic twins experience environments that are similarly alike. If identical twins receive more similar treatment or opportunities for reasons related to their appearance or behavior, their greater resemblance may reflect environmental similarity as well as genetic influence. Researchers therefore consider shared-environment assumptions when drawing conclusions from differences in twin resemblance.
Greater resemblance among monozygotic twins can indicate genetic influence, but it does not by itself establish a purely genetic cause. Researchers also examine dizygotic twin comparisons, environmental patterns, and study design. Differences between identical twins are informative because they show that genetic similarity does not eliminate environmental contributions to psychological characteristics or developmental outcomes.
The comparison provides a reference for judging how resemblance changes with genetic similarity. When identical and fraternal twin pairs show different levels of similarity for a trait, that pattern can help estimate the relative contribution of genetic and environmental factors. The result is an inference about variation across people, not a prediction that genes determine an individual outcome.
Researchers look for patterns in which genetic similarity relates differently to a psychological trait across environmental circumstances. Similarities between twins may increase or decrease depending on their experiences, while differences within genetically similar pairs can highlight environmental effects. Such findings extend the analysis beyond separate genetic and environmental contributions by examining how the two may operate together.
A study identifies monozygotic and dizygotic twin pairs, selects a psychological characteristic or developmental outcome, and measures that characteristic across the participants. Researchers then compare within-pair similarities and differences, consider environmental circumstances, and interpret the pattern in relation to genetic and environmental contributions. The design and assumptions used determine how confidently those comparisons can be understood.
Twin studies can examine personality, intelligence, psychopathology, and developmental outcomes. For each area, researchers compare the resemblance of twin pairs and assess how differences across pairs or environments inform explanations of variation. This makes the method useful for studying both typical psychological characteristics and mental-health-related patterns within developmental research.
They can provide evidence about the extent to which genetic and environmental factors may contribute to variation in psychological traits, behavior, mental health, or development. They cannot make conclusions independent of their assumptions about shared environments and study design. Consequently, findings describe patterns of resemblance and difference rather than proving a single cause for an individual characteristic.