Journal ArticleDOI
The Vertebrate Eye and Its Adaptive Radiation.
TLDR
The conductivity bridge derives its bridge source from a self-contained vacuum tube oscillator adjusted to approximately 1,000 cycles as mentioned in this paper, which operates directly from the A.C. power source.Abstract:
The new Conductivity Bridge derives its bridge source. voltage from a self-contained vacuum tube oscilltor adjusted to approximately 1,000 cycles. Voltage for the amplifier and null indicator tubes is provided by a.builtin D.C. power supply which operates directly from the A.C. power source. 9-324 Conductivity Bridge, without Conductivity Cell, for use with 110 volts 5060 cycle A.C. 9-351.Cosi~uCvity Cell, for use with Conductivity Bridge, constant 0.8, $20.00read more
Citations
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Journal ArticleDOI
The multifunctional choroid.
Debora L. Nickla,Josh Wallman +1 more
TL;DR: It seems that the thickening of the choroid may be mechanistically linked to the scleral synthesis of macromolecules, and thus may play an important role in the homeostatic control of eye growth, and, consequently, in the etiology of myopia and hyperopia.
Journal ArticleDOI
Specific hungers and poison avoidance as adaptive specializations of learning.
Paul Rozin,James W. Kalat +1 more
Book ChapterDOI
A Predator’s View of Animal Color Patterns
TL;DR: In this paper, the authors explore the factors that determine color patterns under various specific conditions and show that the actual pattern evolved in a particular place represents a compromise between factors which favor crypsis and those which favor conspicuous color patterns.
Journal ArticleDOI
Amniote phylogeny and the importance of fossils
TL;DR: The importance of the critical fossils seems to reside in their relative primitive‐ness, and the simplest explanation for their more conservative nature is that they have had less time to evolve.
Journal ArticleDOI
Animal colour vision — behavioural tests and physiological concepts
TL;DR: An overview of the methods used to study animal colour vision is given, and how quantitative modelling can suggest how photoreceptor signals are combined and compared to allow for the discrimination of biologically relevant stimuli is discussed.
References
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Journal ArticleDOI
The eye of the takahe, Porphyrio hochstetteri
TL;DR: The ocular features and normal physiological parameters of the South Island takahe (Porphyrio hochstetteri), using three birds, are described, showing some anatomic possibility of binocular vision but with restriction particularly of the superior and posterior visual fields.
Book ChapterDOI
Interhemispheric Integration of Visual Information in the Pigeon — a Behavioural Study
TL;DR: The optic nerves of birds cross completely at the optic chiasm and the eye movements are independent of each other, Nevertheless, there is complete interocular transfer of intensity, colour and form discriminations.
Book ChapterDOI
Optics and Accommodation in Owls and Flying Foxes
TL;DR: In this paper, the first practical realization of the photorefractive method was accomplished with an attachment to a 35mm camera (Howland and Howland 1973), in which the eye to be studied is illuminated from a fiber optic light guide centered in an array of four cylinder lenses in front of a f#/1.2 camera lens.
Journal ArticleDOI
Alteration of cell shape in the early chick embryo mesoderm by neuraminidase
TL;DR: Results show that cell shape in the chick embryo mesoderm is at least partly determined by the thickness and the composition of the surface coat.
Journal ArticleDOI
Progressive visual loss and severe retinal degeneration in a captive Kodiak bear (Ursus arctos mittendorfi)
Kelly A. Caruso,Seth Koch,Benjamin D. Reynolds,Paul Massimo Giannoni McCarthy,Cameron J. G. Whittaker +4 more
TL;DR: A 27-year-old female Kodiak bear displayed signs of progressive visual loss over an 18-year period and was euthanased eight months later due to a diagnosis of a metastasised hepatic neoplasm.