نتایج جستجو برای: artificial light

تعداد نتایج: 671626  

2015
Anja Russ Susanne Reitemeier Anne Weissmann Jutta Gottschalk Almuth Einspanier Reinhard Klenke

In order to maximize their fitness, organisms in seasonal environments rely on external cues to optimally time their life-history stages. One of the most important zeitgeber to time reproduction is the photoperiod, but further environmental cues are assessed to fine-tune reproduction due to year-to-year variation in environmental conditions. However, in urbanized environments, the pervasive art...

Journal: :Current Biology 2016
Gandhi Yetish Hillard Kaplan Michael Gurven Brian Wood Herman Pontzer Paul R. Manger Charles Wilson Ronald McGregor Jerome M. Siegel

We wish to respond to the commentary of de la Iglesia et al. [1]. Studies comparing sleep in different communities have different goals. One frequent goal has been to determine how sleep is affected by manipulating specific 'modern' conditions. Many studies have investigated the effect of artificial light and electronic entertainment. Such studies have clearly shown that light, particularly blu...

2004
Eric Silverman Seth Bullock

Strong artificial life research is often thought to rely on Alife systems as sources of novel empirical data. It is hoped that by augmenting our observations of natural life, this novel data can help settle empirical questions, and thereby separate fundamental properties of living systems from those aspects that are merely contingent on the idiosyncrasies of terrestrial evolution. Some authors ...

Journal: :Life sciences 1988
S C Dilsaver M J Majchrzak

The authors used a thermoregulation paradigm to test the hypothesis that chronic treatment with bright artificial light produces subsensitivity to the hypothermic effects of clonidine, an alpha 2-agonist. One week of treatment produced blunting of the hypothermic response to clonidine (p less than 0.00001). These findings are consistent with previous reports that somatic treatments for depressi...

2015
Celestino Creatore Alex W. Chin Michael A. Parker Stephen Emmott

INTRODUCTION AND BACKGROUND Photovoltaic (PV) solar energy conversion is one of the most promising emerging renewable energy technologies and is likely to play an ever-increasing role in the future of electricity generation. The potential of photovoltaics is considered to be much larger than the current energy demand, which is equivalent to ≈13,000 millions tons of oil (BP, 2014). Together with...

2014
Koert G van Geffen Roy H A van Grunsven Jasper van Ruijven Frank Berendse Elmar M Veenendaal

Rapidly increasing levels of light pollution subject nocturnal organisms to major alterations of their habitat, the ecological consequences of which are largely unknown. Moths are well-known to be attracted to light at night, but effects of light on other aspects of moth ecology, such as larval development and life-history, remain unknown. Such effects may have important consequences for fitnes...

Journal: :Frontiers in bioscience : a journal and virtual library 2008
Monica Semeraro Serena Silvi Alberto Credi

The bottom-up construction and operation of machines and motors of molecular size is a topic of great interest in nanoscience, and a fascinating challenge of nanotechnology. The problem of the energy supply to make molecular machines work is of the greatest importance. Research in the last ten years has demonstrated that light energy can be used to power artificial nanomachines by exploiting ph...

Journal: :Life sciences 1988
S C Dilsaver M J Majchrzak

Bright artificial light is a treatment for seasonal depression. Eleven (11) rats were exposed to bright artificial light (11,500 lux) for two consecutive weeks. The thermic response to nicotine was measured prior to light exposure and after one and two weeks of treatment. The thermic response to nicotine at baseline was -1.69 +/- 0.25 degrees C (mean +/- SEM). The thermic response to nicotine w...

2015
Shaligram Prajapat Aditi Thakur Kajol Maheshwari Ramjeevan Singh Thakur

“The analysis of cryptic text is hard problem”, and there is no fixed algorithm for generating plain-text from cipher text. Human brains do this intelligently. The intelligent cryptic analysis process needs learning algorithms, co-operative effort of cryptanalyst and mechanism of knowledge based inference engine. This information of knowledge base will be useful for mining data(plain-text, key ...

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