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Related Concept Videos

Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Nuclear Fusion02:45

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Psychodynamic Perspectives on Personality01:27

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The psychodynamic perspective in psychology asserts that most personality functions operate unconsciously, outside of awareness. This means that the motives and emotions driving behavior often remain hidden, automatically buried in the unconscious mind as a defense mechanism to shield us from psychological distress. According to this theory, the unconscious mind contains thoughts, memories, and emotions that are too disturbing to face directly.
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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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In Vitro Nuclear Assembly Using Fractionated Xenopus Egg Extracts
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Nuclear and Optical Bimodal Imaging Probes Using Sequential Assembly: A Perspective.

Shin Hye Ahn1, Eszter Boros1

  • 1Department of Chemistry, Stony Brook University , Stony Brook, New York.

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New bimodal imaging probes combine radioisotopes and fluorophores for enhanced disease diagnosis and surgical guidance, advancing personalized medicine. These targeted tracers offer a dual approach for comprehensive patient care.

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Area of Science:

  • Molecular Imaging
  • Nanotechnology
  • Personalized Medicine

Background:

  • Targeted imaging tracers are crucial for accurate disease diagnosis, staging, and treatment planning.
  • Personalized medicine relies on advanced diagnostic tools for tailored patient care.
  • Bimodal imaging probes offer the potential for comprehensive disease assessment and intervention.

Purpose of the Study:

  • To summarize recent advancements in the design and synthesis of optimized, discrete bimodal imaging probes.
  • To discuss the challenges and future directions in the development of dual-modality imaging agents.
  • To highlight the potential of bimodal probes in nuclear and fluorescence imaging for clinical applications.

Main Methods:

  • Review of current literature on bimodal probe development, focusing on design, synthesis, and pharmacokinetic properties.
  • Analysis of strategies combining radioisotopes for positron emission tomography/single-photon emission computed tomography with fluorophores for fluorescence imaging.
  • Exploration of the integration of nuclear and fluorescence imaging for disease burden assessment and surgical guidance.

Main Results:

  • Significant progress has been made in creating discrete bimodal probes with improved targeting capabilities.
  • The combination of nuclear and fluorescence imaging modalities allows for noninvasive disease assessment and precise surgical intervention.
  • Challenges in probe design, synthesis, and pharmacokinetics are being addressed through innovative approaches.

Conclusions:

  • Bimodal imaging probes represent a significant advancement toward personalized medicine, enabling simultaneous diagnosis and targeted therapy.
  • Continued research and development in bimodal probe technology are essential for realizing their full clinical potential.
  • Optimized bimodal probes are poised to revolutionize disease management by bridging diagnostic and therapeutic interventions.