› › Modified Phycoerythrin From Porphyridium Cruentum Treated With P Chloro Mercuribenzoate

Modified Phycoerythrin from Porphyridium Cruentum Treated with P-chloro-mercuribenzoate

Author : Eiji Fujimori

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Page : 14 pages

File Size : 29,70 MB

Release : 1965

Category : Absorption spectra

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Book Description

Phycoerythrin, pigment-protein complex in photosynthetic organisms, plays a role in photosynthesis in transferring an energy abosrbed by itself to chlorophyll. Previous studies in this laboratory showed that the longest absorption band at 565 millimicrons responsible for fluorescence originates from the interaction between the pigment and SH-group of the protein in phycoerythrin. During the course of investigation on the effect of SH-blocking agent on energy transfer, it was found that modified phycoerythrin is released from cells treated with PCMB. This modified phycoerythrin possesses a single absorption band at 545 millimicrons, while native phycoerythrin shows three absorption bands at 500, 545, and 565 millimicrons. In the glutathione-treated modified phycoerythrin, the highly fluorescent 565 millimicrons chromophore was partially regenerated. This investigation indicates that native phycoerythrin is composed of two units and that modified phycoerythrin is one of them separated from the other containing the 500 millimicrons chromophore only. (Author).



On the Theory of Boolean Formulas

Author : Lorenzo Calabi

Publisher :

Page : 50 pages

File Size : 34,6 MB

Release : 1965

Category : Algebra, Boolean

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Book Description

Substitution operators for subformulas of Boolean formulas are introduced and investigated.



Experimental Study of Zone Refining of the Binary System Triphenyl Antimony-benzoic Acid

Author : Marvin S. Brooks

Publisher :

Page : 94 pages

File Size : 36,42 MB

Release : 1965

Category : Antimony

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Book Description

An experimental study on the zone refining of the binary system triphenyl antimony-benzoic acid is described. The isotope Sb124, which is a strong gamma emitter, was employed as a tracer; this allowed a rapid in situ nondestructive analysis, closely spaced experimental points, and the opportunity to study distribution as a function of varying experimental conditions. With the aid of computers (IBM 7090 and IBM 7044) apparent k's were calculated and the experimental data compared with those predicted from various mathematical models. (Author).



On the Resolving Power of Ground Mapping Radar Antennas

Author : J. F. McIlvenna

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Page : 66 pages

File Size : 41,21 MB

Release : 1965

Category : Aerial photography

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Book Description

The mapping of extended, cultural ground targets by an airborne radar is examined using communication theory concepts including those of the antenna transfer function and the target spatial frequency spectrum. Use of the set of transfer functions that correspond to Taylor aperture distributions and specification of the targets directly in terms of their spatial frequency spectra, permits one to examine the antenna images for quality and resolution. The results obtained indicate that resolution for a class of ground targets can be much better than is predicted by the two-point Rayleigh resolution criterion. It is also true that there can be situations in which the shape of the antenna images are quite independent of the radiation pattern. Several types of spatial noise were also included in the input spectrum to investigate noise effects on image quality and resolution. (Author).



Electromagnetic Properties of a Plasma-covered Antenna

Author : Daniel J. Jacavanco

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Page : 22 pages

File Size : 28,28 MB

Release : 1965

Category : Antennas, Horn

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Book Description

Antenna patterns (E-plane) of an X-band horn mounted in a ground plane and covered by a plasma slab were measured. A pulsed plasma was produced by capacitor discharge in a rectangular pyrex container of 6 in. x 2 in. x 24 in. i.d. Microwave interferometer measurements of the electron density were made at 9 and 35 Gc. Antenna patterns are presented which show a sharp decrease in radiated power at certain angles corresponding to the 'optics critical angle'. Good agreement is obtained for the movement of the optics critical angle with plasma density. (Author).





Waveforms and Relative Phase Stability of Transients Radiated from a Helicopter-supported Antenna Wire

Author : E. A. Lewis

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Page : 18 pages

File Size : 37,63 MB

Release : 1965

Category : Hanscom AFB (Mass.)

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Book Description

A nearly vertical antenna wire varying in length from 3000 to 8000 ft was shock-excited by a high-voltage source. The resulting radiation fields were received at distances of about 600 km by two stations separated laterally so as to subtend an angle of about 15© at the source. The difference in wavefront arrival times at the two stations, observed for 101 transmissions, showed an average absolute deviation from the mean of about only 1/2 [mu]s. This figure includes the effects of possible source asymmetries, sferics noise, instrumental errors, and wave propagation. Typical oscillograms of antenna currents and radiation fields are given. It is shown that the amplitudes and durations of the pulse envelopes, the amplitudes and durations of the first half-cycles, and the quasi-frequencies of the pulses are in good agreement with a theory that takes energy losses into account.







Magneto-ionic Coupling in an Inhomogeneous Medium

Author : Yūji Inoue

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Page : 46 pages

File Size : 13,83 MB

Release : 1965

Category : Atmospheric models

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Book Description

The propagation of electromagnetic waves in a horizontally stratified layer of gyrotropic medium is discussed. Derivation of a comprehensive representation for magneto-ionic coupling coefficients allows interpretation of the physical significance of the coupling. Introduction of an invariant quantity for an inhomogeneous medium becomes an important guide for numerical solutions of the wave equation. Numerical results of magneto-ionic coupling coefficients are presented. Based on region properties, characteristic wave types are defined: for the isotropic region, linearly polarized waves are used; for the anisotropic region, elliptically polarized waves generally are applied. (Author).