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Physiological state of female and light intensity affect the host-plant selection of carrot psyllid, Trioza apicalis (Hemiptera: Triozidae)
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Key words. Triozidae, Trioza apicalis, host-plant selection, Daucus carota, Picea abies, light intensity, light gradient, host preference, behaviour, physiological state
Abstract. We have studied the effect of different light gradient regimes on host-plant selection of the carrot psyllid, Trioza apicalis Förster. In both a strong and a weak light gradient, carrot psyllids preferred a carrot leaf placed in higher light intensity. When the choice was between the host (carrot Dau...
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Competition for light between phytoplankton species: experimental tests of mechanistic theory.
Ecology
; INTRODUCTION Light is the sole energy source for nearly all plant species, ranging from the tiny phytoplankton to giant sequoia trees. As a consequence, the availability of light has a major impact on the dynamics and structure of most aquatic and terrestrial communities. Light differs from all
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Population dynamics of light-limited phytoplankton: microcosm experiments.
Ecology
; INTRODUCTION Many concepts in aquatic ecology are based on the light gradient. For example, for a given light gradient it is possible to indicate the depth of the euphotic zone, where most photosynthesis takes place (cf. Reynolds 1984). For a given light gradient it is possible to estimate the
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UV power monitor. (Designer's Corner: useful technology for your idea file).(Omron Electronics)
Global Design News
; Operating an ultraviolet (UV) light source out of specification can lead to defective products due to improper curing or poor sterilization. So checking UV light intensity periodically is important to maintain product quality. The F3UV improves quality control, allowing users to switch from
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Digitally control room light intensity.(design ideas)
EDN
; MANY PEOPLE FAVOR different light and temperature settings for different rooms depending upon their mood or whether they are working or relaxing. The circuit in Figure 1 controls the intensity of the artificial light in a room and monitors the temperature of two zones. The two main circuit blocks
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LTF Technology Simplifies Light Sensing.(light-to-frequency converter)
Control Engineering
; Ray King, TAOS What is a light-to-frequency converter and how does it work? A light-to-frequency (LTF) converter measures light intensity and produces a square wave signal with frequency directly proportional to the light intensity. The square wave's amplitude does not change with light intensity;
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Cytological basis of photoresponsive behavior in a sponge larva.(Statistical Data Included)
The Biological Bulletin
; Sally P. Leys (1 Bernard M. Degnan (2) Abstract. Ontogenetic changes in the photoresponse of larvae from the demosponge Reneira sp. were studied by analyzing the swimming paths of individual larvae exposed to diffuse white light. Larvae swam upward upon release from the adult, but were negatively
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Intensity of Curing Lights Affected by Barriers.
Journal of Dental Hygiene
; Introduction The Centers for Disease Control and Prevention (CDC) recommend that instruments and equipment that come in contact with the mucous membranes be heat or vapor-sterilized. At a minimum, these semi-critical instruments must be sterilized in a liquid chemical agent with an Environmental
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Managing Turf with Reduced Light.
SportsTURF
; Various kinds of shade can affect turfgrass performance. Tree shade is the most widespread problem, affecting both light quality and light quantity (intensity) as well as providing tree root competition for moisture and nutrients. Buildings, beams, mounds and mountains can reduce light quality and
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STOCKERYALE DIGITAL ILLUMINATOR.
Robotics World
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Light weight, high performance
Dental Products Report
; Ergonomic LED for cool, quick curing Information provided by VOCO America Inc. The Celalux lightweight (3.6 ounces), ergonomie LED curing light provides a high light intensity of 1000 mW/cm^sup 2^. Targeted light focusing and low stray loss allow highly effective material curing with virtually no
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