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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions02:31

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Inductance: Single-Phase And Three-Phase Line01:28

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
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Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Author Spotlight: High-Throughput Screening to Obtain Crystal Hits for Protein Crystallography
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New approaches to high-throughput phasing.

Zbigniew Dauter1

  • 1Synchrotron Radiation Research Section, National Cancer Institute, Brookhaven National Laboratory, Building 725A-X9, Upton, NY 11973, USA. dauter@bnl.gov

Current Opinion in Structural Biology
|December 5, 2002
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Summary
This summary is machine-generated.

Recent advances in macromolecular phasing streamline crystal structure determination. High-throughput methods and synchrotron data collection enable easier, more automated structure elucidation, even with weak anomalous signals.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • Macromolecular phasing is a critical step in determining crystal structures.
  • High-throughput structural biology initiatives have driven progress in this area.
  • Traditional phasing methods can be complex and time-consuming.

Purpose of the Study:

  • To highlight recent advancements in macromolecular phasing techniques.
  • To discuss the impact of high-throughput structural biology on phasing automation.
  • To explore the potential for fully automated crystal structure elucidation.

Main Methods:

  • Incorporation of anomalously scattering ions via salt soaks.
  • Application of multiwavelength anomalous dispersion (MAD), single-wavelength anomalous dispersion (SAD), and multiple isomorphous replacement (MIR) phasing methods.
  • Collection of accurate diffraction data using synchrotron beam lines with advanced hardware and software.

Main Results:

  • Phasing has become easier and more automated.
  • Weak anomalous signals from inherent atoms like sulfur and phosphorus can be utilized.
  • Accurate diffraction data collection is now feasible for complex structures.

Conclusions:

  • Current progress in phasing, crystallization, and data collection is substantial.
  • The process of macromolecular crystal structure elucidation is moving towards full automation.
  • Future structural biology efforts will benefit from these streamlined techniques.