About the development of the first fly-eye telescope

A Genetic Method for Generating Drosophila Eyes Composed Exclusively of Mitotic Clones of a Single Genotype

Genetics ◽

10.1093/genetics/152.4.1631 ◽

1999 ◽

Vol 152 (4) ◽

pp. 1631-1639 ◽

Cited By ~ 4

Author(s):

R Steven Stowers ◽

Thomas L Schwarz

Keyword(s):

Developmental Stage ◽

Genetic Screens ◽

Wild Type ◽

Phenotypic Analysis ◽

Standard Methods ◽

Genetic Method ◽

Lethal Mutations ◽

Single Genotype ◽

Late Developmental Stage ◽

Fly Eye

Abstract The genetic analysis of a gene at a late developmental stage can be impeded if the gene is required at an earlier developmental stage. The construction of mosaic animals, particularly in Drosophila, has been a means to overcome this obstacle. However, the phenotypic analysis of mitotic clones is often complicated because standard methods for generating mitotic clones render mosaic tissues that are a composite of both mutant and phenotypically normal cells. We describe here a genetic method (called EGUF/hid) that uses both the GAL4/UAS and FLP/FRT systems to overcome this limitation for the Drosophila eye by producing genetically mosaic flies that are otherwise heterozygous but in which the eye is composed exclusively of cells homozygous for one of the five major chromosome arms. These eyes are nearly wild type in size, morphology, and physiology. Applications of this genetic method include phenotypic analysis of existing mutations and F1 genetic screens to identify as yet unknown genes involved in the biology of the fly eye. We illustrate the utility of the method by applying it to lethal mutations in the synaptic transmission genes synaptotagmin and syntaxin.

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New Tools for the Optimized Follow-Up of Imminent Impactors

Universe ◽

10.3390/universe7010010 ◽

2021 ◽

Vol 7 (1) ◽

pp. 10

Author(s):

Maddalena Mochi ◽

Giacomo Tommei

Keyword(s):

Orbit Determination ◽

Main Belt ◽

Impact Monitoring ◽

The Earth ◽

Current Observation ◽

Short Period ◽

Fly Eye ◽

Near Earth Asteroids ◽

Near Earth Objects

The solar system is populated with, other than planets, a wide variety of minor bodies, the majority of which are represented by asteroids. Most of their orbits are comprised of those between Mars and Jupiter, thus forming a population named Main Belt. However, some asteroids can run on trajectories that come close to, or even intersect, the orbit of the Earth. These objects are known as Near Earth Asteroids (NEAs) or Near Earth Objects (NEOs) and may entail a risk of collision with our planet. Predicting the occurrence of such collisions as early as possible is the task of Impact Monitoring (IM). Dedicated algorithms are in charge of orbit determination and risk assessment for any detected NEO, but their efficiency is limited in cases in which the object has been observed for a short period of time, as is the case with newly discovered asteroids and, more worryingly, imminent impactors: objects due to hit the Earth, detected only a few days or hours in advance of impacts. This timespan might be too short to take any effective safety countermeasure. For this reason, a necessary improvement of current observation capabilities is underway through the construction of dedicated telescopes, e.g., the NEO Survey Telescope (NEOSTEL), also known as “Fly-Eye”. Thanks to these developments, the number of discovered NEOs and, consequently, imminent impactors detected per year, is expected to increase, thus requiring an improvement of the methods and algorithms used to handle such cases. In this paper we present two new tools, based on the Admissible Region (AR) concept, dedicated to the observers, aiming to facilitate the planning of follow-up observations of NEOs by rapidly assessing the possibility of them being imminent impactors and the remaining visibility time from any given station.

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Pyramidal fly-eye detection antenna for optical wireless systems

10.1049/ic:19990696 ◽

1999 ◽

Cited By ~ 5

Author(s):

K.L. Sterckx

Keyword(s):

Wireless Systems ◽

Optical Wireless ◽

Eye Detection ◽

Fly Eye

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The Design of Telecentric Lenses and Fly-eye Lenses by Utilizing fθ Formula

Korean Journal of Optics and Photonics ◽

10.3807/kjop.2013.24.1.009 ◽

2013 ◽

Vol 24 (1) ◽

pp. 9-16 ◽

Cited By ~ 1

Author(s):

Cheon-Seog Rim

Keyword(s):

Fly Eye

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Die Spektralsensitivität von Insekten-Komplexaugen im Ultraviolett bis 290 mμ

Zeitschrift für Naturforschung B ◽

10.1515/znb-1959-0413 ◽

1959 ◽

Vol 14 (4) ◽

pp. 273-278 ◽

Cited By ~ 28

Author(s):

Jost Bernhard Walther ◽

Eberhard Dodt

Keyword(s):

Ultraviolet Light ◽

Periplaneta Americana ◽

Light Adaptation ◽

Compound Eye ◽

Monochromatic Light ◽

High Sensitivity ◽

Relative Sensitivity ◽

Calliphora Erythrocephala ◽

Sensitivity Curves ◽

Fly Eye

Behaviour experiments have shown that insects react to ultraviolet light. Almost no data are available within this spectral range, however, on the sensitivity of their light sense organs.In this investigation the relative spectral sensitivity (1/Q) of the compound eye of the fly, Calliphora erythrocephala, and various areas of the compound eye of the cockroach, Periplaneta americana, was measured including the ultraviolet range down to 290 mμ. Equal amplitudes of the electroretinogram indicated equal efficiencies of the stimuli.The sensitivity curve in both species shows, besides the known maximum in the blue green, a second maximum in the ultraviolet. This second maximum was found between 341-369 mμ depending on the species and the particular area of the eye. At still shorter wave lengths sensitivity decreases. In the fly eye and the upper part of the cockroach eye the sensitivity maximum in the ultraviolet is higher than in the bluegreen, whereas in the ventral part of the cockroch eye it is lower. Monochromatic light adaptation selectively influences the relative sensitivity of the upper part of the cockroach eye.The sensitivity curves are discussed with regard to visual pigments and types of receptors. Fluorescence of the eye media is considered to have only negligible if any influence on the high sensitivity for ultraviolet light.

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