Biological systems (e.g. cells) can make stochastic transitions between phenotypes (e.g. states …
Biological systems (e.g. cells) can make stochastic transitions between phenotypes (e.g. states of relatively increased or decreased drug resistance). This means that an initially drug-sensitive population can generate relatively drug-resistant subpopulations. This video presents a metronomogram, which is a tool for understanding whether such stochastic transitions can provide an opportunity for therapeutic treatment. Citation: Liao D, Estevez-Salmeron L, and Tlsty TD (2012) "Conceptualizing a tool to optimize therapy based on dynamic heterogeneity," Phys. Biol. 9:065005.
To gain an understanding of mixtures and the concept of separation of …
To gain an understanding of mixtures and the concept of separation of mixtures, students use strong magnets to find the element of iron in iron-fortified breakfast cereal flakes. Through this activity, they see how the iron component of this heterogeneous mixture (cereal) retains its properties and can thus be separated by physical means.
Students use a watt meter to measure energy input into a hot …
Students use a watt meter to measure energy input into a hot plate or hot pot used to heat water. The theoretical amount of energy required to raise the water by the measure temperature change is calculated and compared to the electrical energy input to calculate efficiency.
Einstein's Messengers is an award-winning, 20-minute documentary on LIGO, NSF's Laser Interferometer …
Einstein's Messengers is an award-winning, 20-minute documentary on LIGO, NSF's Laser Interferometer Gravitational Wave Observatory. The video examines how LIGO is spearheading the new field of gravitational wave astronomy and opening a whole new window on the universe. It explains how LIGO's exquisitely sensitive instruments may ultimately take us farther back in time than we've ever been, catching, perhaps, the first murmurs of the universe in formation. Above all, Einstein's Messengers is a compelling, thought-provoking production about the drama of the scientific quest.
Paul Andersen compares and contrasts elastic and inelastic collisions. In all collisions …
Paul Andersen compares and contrasts elastic and inelastic collisions. In all collisions the linear momentum will be conserved. In an elastic collision the kinetic energy of the objects will also be maintained. Several examples and demonstrations are included.
Paul Andersen explains how electric charge is quantized and how the smallest …
Paul Andersen explains how electric charge is quantized and how the smallest unit of charge is 1.6x10^-19 C, or the elementary charge. Robert Millikan discovered the elementary charge using the oil drop experiment. Electrons have a negative elementary charge and protons have a positive elementary charge.
The video resource "Electric Charge: Crash Course Physics #25" is included in …
The video resource "Electric Charge: Crash Course Physics #25" is included in the "Sociology" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.
Paul Andersen explains how electric circuits contain different elements which can be …
Paul Andersen explains how electric circuits contain different elements which can be connected in series or in parallel. The following four elements are explained in detail; emf, resistor, capacitor, and switch. The voltage and current of resistors in both series and parallel are explained.
The video resource "Electric Current: Crash Course Physics #28" is included in …
The video resource "Electric Current: Crash Course Physics #28" is included in the "Media Literacy" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.
Paul Andersen explains how the electric field between oppositely and equally charged …
Paul Andersen explains how the electric field between oppositely and equally charged plates is uniform as long as you are far from the edge. The strength of the electric field can be determined by either the charge of the plate and the area or the voltage and separation.
Paul Andersen explains how the electric field strength decreases as the square …
Paul Andersen explains how the electric field strength decreases as the square of the radius as you move away from a point charge, or a uniform distribution of charge on a sphere. This is a direct application of Coulomb's Law.
The video resource "Electric Fields: Crash Course Physics #26" is included in …
The video resource "Electric Fields: Crash Course Physics #26" is included in the "Sociology" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.
Paul Andersen explains how electric force on an object inside a field …
Paul Andersen explains how electric force on an object inside a field can be calculated by multiplying the charge of the object (in C) times the electric field strength (in N/C).
Paul Andersen explains how electric permittivity of a material resists the formation …
Paul Andersen explains how electric permittivity of a material resists the formation of electric fields. Capacitors store energy be preventing the formation of electric fields in dielectric material. The electric permittivity of free space is constant and increases in insulators.
Mr. Andersen introduces the topic of electricity. He differentiates between static electricity …
Mr. Andersen introduces the topic of electricity. He differentiates between static electricity and current electricity. An introduction to electric circuits is also included.
Paul Andersen explains how electromagnetic forces are exerted over all scales and …
Paul Andersen explains how electromagnetic forces are exerted over all scales and dominate at the human scale. The magnitude of electromagnetic forces vary with the magnitude and motion of the electric charges involved.
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