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1.
Ingrid Schmidt Eckhart Simon 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1979,134(2):151-157
Summary When bees dance on a horizontal comb in an enclosed hive, they set the direction of their waggle runs with reference to an artificial light source. If this light contains wavelengths long enough to excite the blue or green receptors in the bee's eye, the dance direction relative to the lamp is the same as it would be relative to the sun. But if the emitted light excites only the UV receptors the bee dances in the opposite direction. Evidently the bee interprets the UV-colored light source as a part of the sky with azimuth opposite to that of the sun. 相似文献
2.
Evidence for instantaneous e-vector detection in the honeybee using an associative learning paradigm
Sakura M Okada R Aonuma H 《Proceedings. Biological sciences / The Royal Society》2012,279(1728):535-542
Many insects use the polarization pattern of the sky for obtaining compass information during orientation or navigation. E-vector information is collected by a specialized area in the dorsal-most part of the compound eye, the dorsal rim area (DRA). We tested honeybees' capability of learning certain e-vector orientations by using a classical conditioning paradigm with the proboscis extension reflex. When one e-vector orientation (CS+) was associated with sugar water, while another orientation (CS-) was not rewarded, the honeybees could discriminate CS+ from CS-. Bees whose DRA was inactivated by painting did not learn CS+. When ultraviolet (UV) polarized light (350 nm) was used for CS, the bees discriminated CS+ from CS-, but no discrimination was observed in blue (442 nm) or green light (546 nm). Our data indicate that honeybees can learn and discriminate between different e-vector orientations, sensed by the UV receptors of the DRA, suggesting that bees can determine their flight direction from polarized UV skylight during foraging. Fixing the bees' heads during the experiments did not prevent learning, indicating that they use an 'instantaneous' algorithm of e-vector detection; that is, the bees do not need to actively scan the sky with their DRAs ('sequential' method) to determine e-vector orientation. 相似文献
3.
4.
The two major spore DNA repair pathways, nucleotide excision repair and spore photoproduct lyase, are sufficient for the resistance of Bacillus subtilis spores to artificial UV-C and UV-B but not to solar radiation. 总被引:1,自引:0,他引:1
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Bacterial endospores are 1 to 2 orders of magnitude more resistant to 254-nm UV (UV-C) radiation than are exponentially growing cells of the same strain. This high UV resistance is due to two related phenomena: (i) DNA of dormant spores irradiated with 254-nm UV accumulates mainly a unique thymine dimer called the spore photoproduct (SP), and (ii) SP is corrected during spore germination by two major DNA repair pathways, nucleotide excision repair (NER) and an SP-specific enzyme called SP lyase. To date, it has been assumed that these two factors also account for resistance of bacterial spores to solar UV in the environment, despite the fact that sunlight at the Earth's surface consists of UV-B, UV-A, visible, and infrared wavelengths of approximately 290 nm and longer. To test this assumption, isogenic strains of Bacillus subtilis lacking either the NER or SP lyase DNA repair pathway were assayed for their relative resistance to radiation at a number of UV wavelengths, including UV-C (254 nm), UV-B (290 to 320 nm), full-spectrum sunlight, and sunlight from which the UV-B portion had been removed. For purposes of direct comparison, spore UV resistance levels were determined with respect to a calibrated biological dosimeter consisting of a mixture of wild-type spores and spores lacking both DNA repair systems. It was observed that the relative contributions of the two pathways to spore UV resistance change depending on the UV wavelengths used in a manner suggesting that spores irradiated with light at environmentally relevant UV wavelengths may accumulate significant amounts of one or more DNA photoproducts in addition to SP. Furthermore, it was noted that upon exposure to increasing wavelengths, wild-type spores decreased in their UV resistance from 33-fold (UV-C) to 12-fold (UV-B plus UV-A sunlight) to 6-fold (UV-A sunlight alone) more resistant than mutants lacking both DNA repair systems, suggesting that at increasing solar UV wavelengths, spores are inactivated either by DNA damage not reparable by the NER or SP lyase system, damage caused to photosensitive molecules other than DNA, or both. 相似文献
5.
About 95% of the ultraviolet (UV) photons reaching the Earth’s surface are UV-A (315–400 nm) photons. Plant responses to UV-A radiation have been less frequently studied than those to UV-B (280–315 nm) radiation. Most previous studies on UV-A radiation have used an unrealistic balance between UV-A, UV-B, and photosynthetically active radiation (PAR). Consequently, results from these studies are difficult to interpret from an ecological perspective, leaving an important gap in our understanding of the perception of solar UV radiation by plants. Previously, it was assumed UV-A/blue photoreceptors, cryptochromes and phototropins mediated photomorphogenic responses to UV-A radiation and “UV-B photoreceptor” UV RESISTANCE LOCUS 8 (UVR8) to UV-B radiation. However, our understanding of how UV-A radiation is perceived by plants has recently improved. Experiments using a realistic balance between UV-B, UV-A, and PAR have demonstrated that UVR8 can play a major role in the perception of both UV-B and short-wavelength UV-A (UV-Asw, 315 to ∼350 nm) radiation. These experiments also showed that UVR8 and cryptochromes jointly regulate gene expression through interactions that alter the relative sensitivity to UV-B, UV-A, and blue wavelengths. Negative feedback loops on the action of these photoreceptors can arise from gene expression, signaling crosstalk, and absorption of UV photons by phenolic metabolites. These interactions explain why exposure to blue light modulates photomorphogenic responses to UV-B and UV-Asw radiation. Future studies will need to distinguish between short and long wavelengths of UV-A radiation and to consider UVR8’s role as a UV-B/UV-Asw photoreceptor in sunlight. In sunlight, UVR8 mediates the perception of both UV-B and short-wavelength UV-A radiation with its sensitivity moderated by blue light perceived through cryptochromes. 相似文献
6.
Taejun Han Jeong‐Ae Kong Young‐Seok Han Sung‐Ho Kang Donat‐Peter Hder 《Journal of phycology》2004,40(2):315-322
Recent reduction in the ozone shield due to manufactured chlorofluorocarbons raised considerable interest in the ecological and physiological consequences of UV‐B radiation (λ=280–315 nm) in macroalgae. However, early life stages of macroalgae have received little attention in regard to their UV‐B sensitivity and UV‐B defensive mechanisms. Germination of UV‐B irradiated spores of the intertidal green alga Ulva pertusa Kjellman was significantly lower than in unexposed controls, and the degree of reduction correlated with the UV doses. After exposure to moderate levels of UV‐B irradiation, subsequent exposure to visible light caused differential germination in an irradiance‐ and wavelength‐dependent manner. Significantly higher germination was found at higher photon irradiances and in blue light compared with white and red light. The action spectrum for photoreactivation of germination in UV‐B irradiated U. pertusa spores shows a major peak at 435 nm with a smaller but significant peak at 385 nm. When exposed to December sunlight, the germination percentage of U. pertusa spores exposed to 1 h of solar radiation reached 100% regardless of the irradiation treatment conditions. After a 2‐h exposure to sunlight, however, there was complete inhibition of germination in PAR+UV‐A+UV‐B in contrast to 100% germination in PAR or PAR+UV‐A. In addition to mat‐forming characteristics that would act as a selective UV‐B filter for settled spores under the parental canopy, light‐driven repair of germination after UV‐B exposure could explain successful continuation of U. pertusa spore germination in intertidal settings possibly affected by intense solar UV‐B radiation. 相似文献
7.
J D Morrey S M Bourn T D Bunch M K Jackson R W Sidwell L R Barrows R A Daynes C A Rosen 《Journal of virology》1991,65(9):5045-5051
UV irradiation has been shown to activate the human immunodeficiency virus type 1 (HIV-1) long terminal repeat (LTR) in cell culture; however, only limited studies have been described in vivo. UV light has been categorized as UV-A (400 to 315 nm), -B (315 to 280 nm), or -C (less than 280 nm); the longer wavelengths are less harmful but more penetrative. Highly penetrative UV-A radiation constitutes the vast majority of UV sunlight reaching the earth's surface but is normally harmless. UV-B irradiation is more harmful but less prevalent than UV-A. In this report, the HIV-1 LTR-luciferase gene in the skin of transgenic mice was markedly activated when exposed to UV-B irradiation. The LTR in the skin of transgenic mice pretreated topically with a photosensitizing agent (psoralen) was also activated to similar levels when exposed to UV-A light. A 2-h exposure to sunlight activated the LTR in skin treated with psoralen, whereas the LTR in skin not treated with psoralen was activated after 7 h of sunlight exposure. The HIV-1 LTR-beta-galactosidase reporter gene was preferentially activated by UV-B irradiation in a small population of epidermal cells. The transgenic mouse models carrying HIV-1 LTR-luciferase and LTR-beta-galactosidase reporter genes have been used to demonstrate the in vivo UV-induced activation of the LTR and might be used to evaluate other environmental factors or pharmacologic substances that might potentially activate the HIV-1 LTR in vivo. 相似文献
8.
The Indian meal moth (IMM), Plodia interpunctella (Hübner) (Lepidoptera: Pyralidae), engages in long-distance or foraging flights in the twilight hours of the scotophase when blue light dominates the irradiance spectrum of the sky. We tested the hypothesis that IMM uses wavelengths of visible blue/violet light as orientation cues that trigger phototactic responses. In four-choice laboratory experiments, blue light (400–475 nm) was significantly more effective than green (475–600 nm), orange (575–700 nm), or red (590–800 nm) light in attracting males and mated females. In subsequent experiments that tested light emitting diodes (LEDs) emitting peak wavelengths in the blue/violet-light range, the 405-nm 'violet' LED was significantly more effective than the 435-, 450-, or 470-nm 'blue' LED in attracting males as well as virgin and mated females. In electroretinogram recordings, the 405-nm wavelength elicited significantly stronger receptor potentials from female and male eyes than the 350-nm (UV) wavelength, and in a behavioral experiment it significantly enhanced the known attractiveness of UV light. Equal attraction of IMMs to 405-nm LEDs at 600–700 µW/cm2 with or without UV light, and significantly stronger attraction to a 405-nm LED than to a 350-nm LED at maximum light intensities, suggest that the deployment of violet instead of UV light could become one of several management tactics for control of IMMs. 相似文献
9.
Phototropism experiments were done with sporangiophores of the fungus Phycomyces blakesleeanus to characterize the interaction between far-UV, blue and red light. Far-UV light elicits negative phototropism (bending away
from the light source) while blue light elicits positive phototropism (bending toward the light source). In contrast, red
light above 600 nm is phototropically inert. Phototropism was analyzed with light regimens of bilateral or unilateral irradiation
with far-UV and blue light. Under bilateral irradiation, in which the two light sources were facing each other, blue light
partially inhibited the far-UV-elicited phototropism. A fluence-response curve for this inhibition showed that blue light
was maximally effective at fluence rates which exceeded 3 to 57 times that of the far-UV. Tonic red light, which was given
from above, abolished to a large extent the antagonistic action of blue light. With a regimen of unilateral irradiation, i.e.
when far-UV and blue light were given from the same side, a phototropic balance could be achieved with approximately equal
fluence rates of blue and UV light. Above or below this critical balance point the bending was either negative or positive.
In this setup the effect of tonic red light was complex. First, it caused an enhancement of the positive or negative bending,
and second, it caused at some fluence rates a sign reversal from positive to negative phototropism. The balance point itself
was only marginally affected. The data cannot be explained on the basis of a single photoreceptor and support the previous
notion of separate far-UV and blue-light receptors. The antagonism between these two receptors probably occurs on the level
of a red-light-absorbing receptor intermediate.
Received: 16 November 1997 / Accepted: 18 December 1997 相似文献
10.
We investigated the spectral sensitivity and response to light intensity of Aphidius gifuensis (Hymenoptera: Braconidae), a key natural enemy of the green peach aphid, Myzus persicae (Hemiptera: Aphididae). We used 15 monochromatic lights (emitting various specific wavelengths from 340 to 689 nm) and white light. Monochromatic light of different wavelengths and white light elicited photopositive behaviour from A. gifuensis. The strongest response was stimulated by blue light (492 nm), which induced a movement of 43.5 cm, a response that differed from all other groups. This was followed by green light (568 nm) and UV-light (380 nm). There was no significant response to orange light (601 nm) or red light (649, 668 and 689 nm) from A. gifuensis. The response intensity curve for A. gifuensis to monochromatic light (492 nm) decreased as light intensity increased. At 568 nm, the phototactic response showed an ‘S’ shaped curve. But at 628 nm, the phototactic response rose continuously with increasing intensity. We report here that the visual system of A. gifuensis is composed of three spectrum receptors, attuned to UV, blue and green light. While light intensity is a key factor in determining the photopositive response of A. gifuensis, the effect of intensity varies by wavelength. 相似文献
11.
Dr. Willi A. Ribi 《Cell and tissue research》1978,195(3):471-483
Summary Pigment granule migration in pigment cells and retinula cells of the digger wasp Sphex cognatus Smith was analysed morphologically after light adaptation to natural light, dark adaptation and after four selective chromatic adaptations in the range between 358 nm and 580 nm and used as the index of receptor cell sensitivity. The receptor region of each ommatidium consists of nine retinula cells which form a centrally located rhabdom. Two morphologically and physiologically different visual units can be described, defined by the arrangement of the rhabdomeric microvilli, the topographical relationship of the receptor cells with respect to the eye axes and the unique retinula cell screening pigmentation. These two different sets of ommatidia (type A and B) are randomly distributed in a ratio of 13 throughout the eye (Ribi, 1978b). Chromatic adaptation experiments with wavelengths of 358 nm, 443 nm, 523 nm and 580 nm and subsequent histological examination reveal two UV receptors, two blue receptors and four yellow-green receptors in type A ommatidia and two UV receptors and six green to yellow-green receptors in type B ommatidia. The pigments in cells surrounding each ommatidium (two primary pigment cells, 20 secondary pigment cells and four pigmented cone extensions) were not affected significantly by the adaptation experiments. 相似文献
12.
Flavonoid synthesis in cell suspension cultures of parsley (Petroselinum hortense Hoffm.) occurs only after irradiation with ultraviolet light (UV), mainly from the UV-B (280–320 nm) spectral range. However, it is also controlled by phytochrome. A Pfr/Ptot ratio of approximately 20% is sufficient for a maximum phytochrome response as induced by pulse irradiation. Continuous red and far red light, as well as blue light, given after UV, are more effective than pulse irradiations. The response to blue light is considerably greater than that to red and far red light. Continuous red and blue light treatments can be substituted for by multiple pulses and can thus probably be ascribed to a multible induction effect. Continuous irradiations with red, far red and blue light also increase the UV-induced flavonoid synthesis if given before UV. The data indicate that besides phytochrome a separate blue light photoreceptor is involved in the regulation of the UV-induced flavonoid synthesis. This blue light receptor seems to require the presence of Pfr in order to be fully effective.Abbreviations HIR
high irradiance response
- Pfr
far red absorhing form of phytochrome
- Ptet
total phytochrome
- UV
ultraviolet light 相似文献
13.
Fred C. Dyer 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1985,157(2):183-198
Summary Early studies of dance communication inApis florea had shown that waggle dances are not performed on a vertical plane and oriented to gravity, as in the other species ofApis, but instead take place on the flattened top of the exposed comb and are oriented to celestial cues directly. More recent experiments showed thatA. florea can dance in the absence of a view of the sun or blue sky, but did not establish what mechanism permitted this orientation. I now report that dances can be oriented directly to landmarks visible from the nest, the first evidence of an environmental feature other than celestial cues or gravity being involved in dance orientation. Landmarks near the nest are probably used to refer to celestial cues, in a fashion analogous to the use of broad features of the landscape by honeybees in order to learn the sun's course, which permits them to determine their flight angle on overcast days or at night, and to compensate accurately for solar movement.Apis florea may therefore be able to learn the sun's course with respect to two sets of landmarks.In other experiments I have examined the influence of slope onA. florea's dance orientation to visual references. In the first extensive observations of its dances on a vertical plane, I have amply confirmed that this species cannot transpose light and gravity in setting its dance angle, as the other species ofApis can. Nor do dancers orient so as to match visual information seen during the dance with that remembered from the flight. Patterns in the data when the same patch of sky was presented from different angles suggest instead thatA. florea continues to orient to projections of celestial cues onto the horizontal plane even when dancing on a steep slope. This compensation for slope may involve an ability to detect gravity and factor it out in aligning the dance to celestial cues.These insights suggest thatA. florea's dance orientation system has been adapted to requirements imposed by its nesting behavior, and has diverged sharply from the system shared by the other species ofApis. 相似文献
14.
An action spectrum for photoinduction of perithecial formationafter a prior 72 h dark growth period was determined in theUV region with apically growing mycelia of a sordariaceous fungus,Gelasinospora reticulispora. The spectrum exhibited a peak at280 nm. Quantum effectiveness of 280 nm irradiation was ca.1.7 times higher than that of 450 nm light. The number of peritheciainduced by UV radiation was saturated at a lower level as comparedwith blue light. UV radiation having a fluence greater thanthe saturation level decreased the number of induced perithecia.UV radiation that was given after a saturating exposure to inductiveblue light inhibited the inductive effect of blue light. Anaction spectrum for this inhibition exhibited a peak between260 and 270 nm. Monochromatic light beyond 350 nm had no inhibitoryeffect. Inhibitory effects of UV radiation given after inductiveblue light irradiation were observed in the fluence range wherephotoinductive effects of UV radiation became obvious. Therefore,the true height of the UV peak in the photoinduction actionspectrum,when free of distortion from the inhibitory effect, should behigher than the peak obtained in this study. (Received August 20, 1983; Accepted November 4, 1983) 相似文献
15.
Sporulation inBipolaris oryzae was induced by UV radiation (295 nm), but the number of conidia gradually decreased with increasing duration of UV radiation
longer than 1 min. The inductive effect of UV radiation can be nullified by blue light (459 nm) applied immediately before
or after inductive UV radiation shorter than 1 min. In contrast, the number of conidia increased with an increasing duration
of blue light applied after inductive UV radiation longer than 1 min, but not if it was applied before UV radiation. The present
study firstly revealed the possibility of photoreactivation inB. oryzae sporulation. 相似文献
16.
Action of near UV to blue light on photocontrol of phycoerythrin(PE) and phycocyanin (PC) formation was investigated with non-photobleachedTolypothrix tenuis and Fremyella diplosiphon; this study wasdone to evaluate the proposition of Haury and Bogorad [(1977)Plant Physiol., 60: 835] that near UV to blue light is as effectiveas green and red light for photocontrol of PE and PC formationin blue-green algae and that lack of the blue effect in previousexperiments was due to destruction of blue-absorbing pigment(s)by the photobleaching treatment involved in the experimentalmethod. In our present work, light effect was measured in heterotrophiccultures incubated in darkness following brief exposure to differentwavelengths of light. Results indicated that (1) near UV to blue light was not effectivefor induction of PE formation either in T. tenuis or in F. diplosiphon,and (2) PC formation was induced by near UV light at 360 nmbut not by blue light at 460 nm. These features are identicalwith those previously reported for photobleached cells but notwith those reported by Haury and Bogorad for non-photobleachedcells. We conclude that photobleaching treatment does not haveany influence on the action of near UV to blue light. Actionat 390 and 460 nm observed by Haury and Bogorad probably resultedfrom light effects other than photocontrol, e.g., the actionof photosynthesis. (Received December 18, 1981; Accepted April 8, 1982) 相似文献
17.
Ramasubramaniam R Roy A Sharma B Nagalakshmi S 《Photochemical & photobiological sciences》2011,10(12):1887-1893
Most of the studies on sunlight-induced pigmentation of skin are mainly focused on ultraviolet (UV) radiation-induced pigmentation and ways to prevent it. Recent studies have shown that the visible component of sunlight can also cause significant skin pigmentation. In the current study, the extent of pigmentation induced by UV and visible regions of sunlight in subjects with Fitzpatrick skin type IV-V was measured and compared with pigmentation induced by total sunlight. The immediate pigment darkening (IPD) induced by the visible fraction of sunlight is not significantly different from that induced by the UV fraction. However, the persistent pigment darkening (PPD) induced by visible fraction of sunlight in significantly lower than that induced by the UV fraction. The dose responses of IPD induced by UV, visible light and total sunlight suggest that both UV and visible light interact with the same precursor although UV is 25 times more efficient in inducing pigmentation per J cm(-2) of irradiation compared to visible radiation. The measured diffused reflection spectra and decay kinetics of UV and visible radiation-induced pigmentation are very similar, indicating that the nature of the transient and persistent species involved in both the processes are also likely to be same. 相似文献
18.
Koshitaka H Kinoshita M Vorobyev M Arikawa K 《Proceedings. Biological sciences / The Royal Society》2008,275(1637):947-954
This paper presents the first evidence of tetrachromacy among invertebrates. The Japanese yellow swallowtail butterfly, Papilio xuthus, uses colour vision when foraging. The retina of Papilio is furnished with eight varieties of spectral receptors of six classes that are the ultraviolet (UV), violet, blue (narrow-band and wide-band), green (single-peaked and double-peaked), red and broad-band classes. We investigated whether all of the spectral receptors are involved in colour vision by measuring the wavelength discrimination ability of foraging Papilio. We trained Papilio to take nectar while seeing a certain monochromatic light. We then let the trained Papilio choose between two lights of different wavelengths and determined the minimum discriminable wavelength difference Deltalambda. The Deltalambda function of Papilio has three minima at approximately 430, 480 and 560nm, where the Deltalambda values approximately 1nm. This is the smallest value found for wavelength discrimination so far, including that of humans. The profile of the Deltalambda function of Papilio can be best reproduced by postulating that the UV, blue (narrow-band and wide-band), green (double-peaked) and red classes are involved in foraging. Papilio colour vision is therefore tetrachromatic. 相似文献
19.
The fluorescent dye 4′-6-Diamidino-2-phenylindole (DAPI) is frequently used in fluorescence microscopy as a chromosome and nuclear stain because of its high specificity for DNA. Normally, DAPI bound to DNA is maximally excited by ultraviolet (UV) light at 358 nm, and emits maximally in the blue range, at 461 nm. Hoechst dyes 33258 and 33342 have similar excitation and emission spectra and are also used to stain nuclei and chromosomes. It has been reported that exposure to UV can convert DAPI and Hoechst dyes to forms that are excited by blue light and emit green fluorescence, potentially confusing the interpretation of experiments that use more than one fluorochrome. The work reported here shows that these dyes can also be converted to forms that are excited by green light and emit red fluorescence. This was observed both in whole tissues and in mitotic chromosome spreads, and could be seen with less than 10-s exposure to UV. In most cases, the red form of fluorescence was more intense than the green form. Therefore, appropriate care should be exercised when examining tissues, capturing images, or interpreting images in experiments that use these dyes in combination with other fluorochromes. 相似文献
20.
Light emitting diode(LED)‐based trapping of the greenhouse whitefly (Trialeurodes vaporariorum)
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Visual traps like yellow sticky card traps are used for monitoring and control of the greenhouse whitefly (Trialeurodes vaporariorum). However, reflected intensity (brightness) and hence, attractiveness depend on the ambient light conditions, and the colour (wavelength) might not fit with the sensitivity of whitefly photoreceptors. The use of light emitting diodes (LEDs) is a promising approach to increase the attractiveness, specificity and adaptability of visual traps. We constructed LED‐based visual traps equipped with blue and green high‐power LEDs and ultraviolet (UV) standard LEDs according to the putative spectral sensitivities of the insects' photoreceptors. In a series of small‐scale choice and no‐choice recapture experiments, the factors time of day as well as light intensity and light quality (colour) of LED traps were studied in terms of attractiveness compared to yellow traps without LEDs. Green LED traps (517 nm peak wavelength) were comparably attractive in no‐choice experiments but clearly preferred over yellow traps in all choice experiments. The time of day had a clear effect on the flight activity of the whiteflies and thereby on the trapping success. Blue LEDs (474 nm) suppressed the attractiveness of the light traps when combined with green LEDs suggesting that a yet undetected photoreceptor, sensitive for blue light, and an inhibiting interaction with the green receptor, might exist in T. vaporariorum. In choice experiments between LED traps emitting green light only or in combination with UV (368 nm), the green‐UV combination was preferred. In no‐choice night‐time experiments, UV LEDs considerably increased whitefly flight activity and efficacy of trapping. Most likely, the reason for the modifying effect of UV is the stimulating influence on flight activity. In conclusion, it seems that the use of green LEDs alone or in combination with UV LEDs could be an innovative option for improving attractiveness of visual traps. 相似文献