| Records |
| Author |
Patel, J.S.; Radetsky, L.; Rea, M.S. |
| Title |
The Value of Red Light at Night for Increasing Basil Yield |
Type |
Journal Article |
| Year |
2018 |
Publication |
Canadian Journal of Plant Science |
Abbreviated Journal |
Can. J. Plant Sci. |
Volume  |
98 |
Issue |
6 |
Pages |
1321-1330 |
| Keywords |
Plants |
| Abstract |
Sweet basil (<i>Ocimum basilicum L.</i>) is primarily used for culinary purposes, but it is also used in the fragrance and medicinal industries. In the last few years, global sweet basil production has been significantly impacted by downy mildew caused by <i>Peronospora belbahrii</i>. Nighttime exposure to red light has been shown to inhibit sporulation of <i>P. belbahrii</i>. The objective of this study was to determine if nighttime exposure to red light from light-emitting diodes (LEDs; λ<sub>max</sub> = 625 nm) could increase plant growth (plant height and leaf size) and yield (number and weight of leaves) in basil plants. In two sets of greenhouse experiments, red light was applied at a photosynthetic photon flux density (PPFD) of 60 µmol m<sup>-2</sup> s<sup>-1</sup> during the otherwise dark night for 10 hours (from 20:00 to 06:00). The results demonstrate that exposure to red light at night can increase the number of basil leaves per plant, plant height, leaf size (length and width), and leaf fresh and dry weight, compared to plants in darkness at night. The addition of incremental red light at night has the potential to be cost-effective for fresh organic basil production in controlled environments. |
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0008-4220 |
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GFZ @ kyba @ |
Serial |
1955 |
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| Author |
Levin, N.; Ali, S.; Crandall, D. |
| Title |
Utilizing remote sensing and big data to quantify conflict intensity: The Arab Spring as a case study |
Type |
Journal Article |
| Year |
2018 |
Publication |
Applied Geography |
Abbreviated Journal |
Applied Geography |
| Volume |
94 |
Issue |
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Pages |
1-17 |
| Keywords |
Remote Sensing; Society; Human Health |
| Abstract |
Tracking global and regional conflict zones requires spatially explicit information in near real-time. Here, we examined the potential of remote sensing time-series data (night lights) and big data (data mining of news events and Flickr photos) for monitoring and understanding crisis development and refugee flows. We used the recent Arab Spring as a case study, and examined temporal trends in monthly time series of variables which we hypothesized to indicate conflict intensity, covering all Arab countries. Both Flickr photos and night-time lights proved as sensitive indicators for loss of economic and human capital, and news items from the Global Data on Events, Location and Tone (GDELT) project on fight events were positively correlated with actual deaths from conflicts. We propose that big data and remote sensing datasets have potential to provide disaggregated and timely data on conflicts where official statistics are lacking, offering an effective approach for monitoring geopolitical and environmental changes on Earth. |
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0143-6228 |
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GFZ @ kyba @ |
Serial |
1918 |
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| Author |
Borges, R.M. |
| Title |
Dark Matters: Challenges of Nocturnal Communication Between Plants and Animals in Delivery of Pollination Services |
Type |
Journal Article |
| Year |
2018 |
Publication |
Yale Journal of Biology and Medicine |
Abbreviated Journal |
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| Volume |
91 |
Issue |
1 |
Pages |
33-42 |
| Keywords |
Plants; Animals |
| Abstract |
The night is a special niche characterized by dim light, lower temperatures, and higher humidity compared to the day. Several animals have made the transition from the day into the night and have acquired unique adaptations to cope with the challenges of performing nocturnal activities. Several plant species have opted to bloom at night, possibly as a response to aridity to prevent excessive water loss through evapotranspiration since flowering is often a water-demanding process, or to protect pollen from heat stress. Nocturnal pollinators have visual adaptations to function under dim light conditions but may also trade off vision against olfaction when they are dependent on nectar-rewarding and scented flowers. Nocturnal pollinators may use CO2 and humidity cues emanating from freshly-opened flowers as indicators of nectar-rich resources. Some endothermic nocturnal insect pollinators are attracted to thermogenic flowers within which they remain to obtain heat as a reward to increase their energy budget. This review focuses on mechanisms that pollinators use to find flowers at night, and the signals that nocturnally blooming flowers may employ to attract pollinators under dim light conditions. It also indicates gaps in our knowledge. While millions of years of evolutionary time have given pollinators and plants solutions to the delivery of pollination services and to the offering of appropriate rewards, this history of successful evolution is being threatened by artificial light at night. Excessive and inappropriate illumination associated with anthropogenic activities has resulted in significant light pollution which serves to undermine life processes governed by dim light. |
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GFZ @ kyba @ |
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1832 |
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Tan, M.; Li, X.; Li, S.; Xin, L.; Wang, X.; Li, Q.; Li, W.; Li, Y.; Xiang, W. |
| Title |
Modeling population density based on nighttime light images and land use data in China |
Type |
Journal Article |
| Year |
2018 |
Publication |
Applied Geography |
Abbreviated Journal |
Applied Geography |
| Volume |
90 |
Issue |
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Pages |
239-247 |
| Keywords |
Remote Sensing |
| Abstract |
Population change is a key variable that influences climate change, ecological construction, soil and water use, and economic growth. Census data are always point data, whereas planar data are often required in scientific research. By using nighttime light (NTL) images and land use data, combined with the fifth and sixth census data of China at the county level, we carried out spatial matching on the population of each county, respectively, and established population density diagrams of China for 2000 and 2010, which had a spatial resolution of 1 × 1 km. The method proposed in this paper is relatively simple and has a high simulation precision. The results showed that during the first ten years of the 21st century, there are some remarkable characteristics in Chinese population spatial pattern change: 1) the “disappearance” of intermediate-density regions; namely, areas with a population density between 500 and 1500 persons/km2 have decreased by 41% during the ten years; 2) continuous growth of high-density regions; namely, areas with a population density of more than 1500 persons/km2 have increased by 76%; 3) an expansion tendency of low-density regions similar to high-density regions. |
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0143-6228 |
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GFZ @ kyba @ |
Serial |
2481 |
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| Author |
Schuler, L.D.; Schatz, R.; Berweger, C.D. |
| Title |
From global radiance to an increased local political awareness of light pollution |
Type |
Journal Article |
| Year |
2018 |
Publication |
Environmental Science & Policy |
Abbreviated Journal |
Environmental Science & Policy |
| Volume |
89 |
Issue |
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Pages |
142-152 |
| Keywords |
Remote Sensing; Public Safety; Animals |
| Abstract |
We present a novel transparent method to analyze measurements of the Suomi NPP (Suomi National Polar-orbiting Partnership) satellite in night vision, into luminous intensity and luminance on the community level, with a special focus to address light planners and non-experts, and for the first time, to further address politicians, decision-makers and law-makers, and governmental agencies. We checked the propagated efficiency of road lighting and its impact on luminous flux, and identified a waste of light emissions in the largest city of Switzerland, Zurich. We looked at security (issues like criminal acts) and found no correlation with communities’ luminous intensity. We assessed road safety (accidents) against local luminance and found no evidence of darkness being more risky when the overall distribution of illuminance on roads is considered. We screened crayfish habitats in the Canton of Zurich against local illuminance and found clear evidence of preferred darkness for the living. Based on this finding, we propose an upper limit for light immissions in the crayfish habitats. These four analyses have been chosen to demonstrate the usefulness of Suomi NPP's coverage in combination with our approach. We could apply it to ecological, social and economical topics. We hope others will follow and we can draw more attention of governments to take action to reduce the light pollution on local levels, like Langnau am Albis of Switzerland has exemplified. |
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1462-9011 |
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GFZ @ kyba @ |
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1965 |
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