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Thursday, May 14, 2020 | History

2 edition of Exposure to ultraviolet-B radiation found in the catalog.

Exposure to ultraviolet-B radiation

James J. Karanas

Exposure to ultraviolet-B radiation

sensitivity evaluation of an important ecological parameter of the marine copepod Acartia clausi

by James J. Karanas

  • 125 Want to read
  • 31 Currently reading

Published .
Written in English

    Subjects:
  • Ultraviolet radiation -- Physiological effect.

  • Edition Notes

    Statementby James John Karanas.
    The Physical Object
    Pagination[10], 79 leaves, bound :
    Number of Pages79
    ID Numbers
    Open LibraryOL14231685M

      Ultraviolet (UV) radiation is a form of non-ionizing radiation that is emitted by the sun and artificial sources, such as tanning beds. The beneficial effects of UV radiation include the production of a vital nutrient, vitamin D; however, overexposure may present risks. Sunburn, premature aging, and skin cancer are all risks to overexposure. Interaction between ultraviolet-B and photosynthetically active radiation on net photosynthesis, dark respiration and transpiration. Plant Physiol – PubMed CrossRef Google Scholar Teramura AH, Tevini M and Iwanzik W () Effects of ultraviolet-B irradiation on plants during mild water stress.

    What is UVB phototherapy? UVB phototherapy refers to irradiation with shortwave ultraviolet radiation. To treat the whole body, the patient, undressed, stands in a specially designed cabinet containing fluorescent light tubes. Traditionally, broadband UVB was used, but increasingly, narrowband UVB phototherapy (nm) is provided.   Ultraviolet radiation is made up of three types of rays -- ultraviolet A, ultraviolet B, and ultraviolet C. Although ultraviolet C is the most dangerous type of ultraviolet light in terms of its potential to harm life on earth, it cannot penetrate earth's protective ozone layer.

    The effects of ultraviolet-B (UV-B) radiation on water relations, leaf development, and gas-exchange characteristics in pea (Pisum sativum L. cv Meteor) plants subjected to drought were investigated. Plants grown throughout their development under a high irradiance of UV-B radiation ( W m−2) were compared with those grown without UV-B radiation, and after 12 d one-half of the plants. Understanding Ultraviolet Radiation To understand ultraviolet radiation (UV) one needs to know UV s placement in the electromagnetic spectrum. Ultraviolet light is located between X-radiation and visible light. UV has a higher frequency and shorter wavelength than visible light, and it has a lower frequency and longer wavelength than X-radiation.


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Exposure to ultraviolet-B radiation by James J. Karanas Download PDF EPUB FB2

David Weedon AO MD FRCPA FCAP(HON), in Weedon's Skin Pathology (Third Edition), Etiology. Ultraviolet-B radiation appears to be the most important etiological factor; ultraviolet-A plays a minor role.

,– Intentional tanning was considered to be a contributing factor to the increase in tumors on covered sites in a Swedish population. UVB phototherapy appears to produce. This page includes the following topics and synonyms: Sun Exposure, Ultraviolet Radiation, Ultraviolet A, Ultraviolet B.

The exact mechanisms underlying the effect of UV-B radiation on amphibians are unknown, although it is hypothesized that the damage to DNA caused by UV-B exposure may be responsible.

Ultraviolet-B exposure results in the synthesis of pyrimidine dimers between adjacent DNA nucleotides, which impedes the transcription of the affected gene Cited by: 9. UV-B Radiation: From Environmental Stressor to Regulator of Plant Growth presents a comprehensive overview of the origins, current state, and future horizons of scientific research on ultraviolet-B radiation and its perception in plants.

Chapters explore all facets of UV-B research, including the basics of Exposure to ultraviolet-B radiation book UV-B's shorter wavelength. Ultraviolet (UV) is electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency of approximately 30 PHz) to nm ( THz), shorter than that of visible light but longer than radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the is also produced by Exposure to ultraviolet-B radiation book arcs and specialized lights, such.

Unusual high exposure to ultraviolet-C radiation. Trevisan A(1), Piovesan S, Leonardi A, Bertocco M, Nicolosi P, Pelizzo MG, Angelini A.

Author information: (1)Department of Environmental Medicine and Public Health, University of Padova. [email protected] UV radiation is known to cause acute and chronic eye and skin damage.

Description: Ultraviolet-B radiation (UV-B) has profound effects on plant growth and development, and exposure varies with ozone depletion and across geographic regions, with ecosystem and agricultural consequences. This book deals with large-scale impacts but also how UV-B affects plants at the molecular level is also fascinating, and the UV.

Exposure of the skin to ultraviolet-B radiation from the sun converts 7dehydrocholesterol into previtamin D 3, which can be isomerized to vitamin D 3 [35]. Vitamin D 3 is then converted into.

Ultraviolet-Radiation-Related Exposures Introduction Ultraviolet radiation (UVR) is electromagnetic radiation found be-tween X-radiation and light in the electromagnetic spectrum.

It is emitted by the sun and artificial devices, including sunbeds or sun-lamps. UVR can be divided into ultraviolet A. Ultraviolet-B radiation: from stressor to regulatory signal. Following the discovery of ozone layer depletion in the late s, large numbers of studies investigated the effects of ambient and/or enhanced levels of ultraviolet-B (UV-B) radiation on plants, animals, humans and microorganisms.

Ultraviolet-B (UV-B) is electromagnetic radiation coming from the sun, with a medium wavelength which is mostly absorbed by the ozone layer. The biological effects of UV-B are greater than simple heating effects, and many practical applications of UV-B radiation.

Ultraviolet radiation is an abundant potentially harmful environmental factor and DNA damage, cell death and ultimately photoaging and carcinogenesis are among the consequences of exposure to UV. It thus seems reasonable to question whether UV itself leads to the induction of hsp expression with a subsequent increase in the resistance to UV.

Stratospheric ozone depletion due to human activities has resulted in an increase of ultraviolet radiation on the Earth's surface.

The article describes some effects on human health, aquatic ecosystems, agricultural plants and other living things, and explains how much ultraviolet radiation we are currently getting and how we measure it.

Exposure to ultraviolet radiation from the sun is a source of vitamin D. One minimal erythemal dose of sunlight UV radiation provides the equivalent of ab IU of vitamin D2, taken as an oral supplement.

[citation needed] If an adult's arms and legs are exposed to a half minimal erythemal UV radiation, it is the same as taking 3, IU of vitamin D3 through an oral supplement.

Ultraviolet B (UVB) radiation is a potent modulator of skin-related immune responses, particularly those involving the synthesis and the secretion of cytokines.

The discovery of a new T cell mitogen, IL, prompted us to investigate its expression in skin and to examine the. The influence of enhanced ultraviolet-B radiation (UV-B, nm) on competitive balance in wheat (Triticum aestivum L.) and wild oat (Avena fatua L.) was examined in the field for each of 6 yr.

Ambient solar UV radiation causes mortality in larvae of three species of Rana under controlled exposure conditions. Photochemistry and Photobiology Van de Mortel, T. F., and Buttemer, W. Avoidance of ultraviolet-B radiation in frogs and tadpoles of. Ultraviolet A radiation (UVA) is long wavelength UVR (wavelength: – nm).

UVA passes through the whole atmosphere and accounts for 95% of UVR reaching the Earth's surface. It penetrates through an individual's epidermis into the dermis.

UVA has lower energy than ultraviolet B radiation (UVB) and causes less damage per photon. UV radiation: Ultraviolet radiation. Invisible rays that are part of the energy that comes from the sun, can burn the skin, and cause skin radiation is made up of three types of rays -- ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC).

Abstract. Vitamin D is known as the sunshine vitamin. During exposure to sunlight the skin transforms 7-dehydrocholesterol into vitamin D hout evolution vitamin D 3 has played a pivotal role in the evolution of vertebrates. Vitamin D is not only critically important for bone health but has a multitude of other biologic functions to help reduce chronic illnesses.

Exposure to Different UV-B Irradiance and Leaf Inversion Experiments. After the pea seeds were sown, pots were placed in a transparent UV-exposure cabinet within the greenhouse, as described by Allen et al.

().The UV-C radiation was screened out by cellulose diacetate film, and the control treatments were under the same configuration of lamps as the UV-B treatments, but the UV-B was.Ultraviolet radiation lies between wavelengths of about nanometres (1 nanometre [nm] is 10 −9 metre) on the visible-light side and about 10 nm on the X-ray side, though some authorities extend the short-wavelength limit to 4 nm.

In physics, ultraviolet radiation is traditionally divided into four regions: near (– nm), middle (– nm), far (– nm), and extreme (below.of solar ultraviolet-B (UV-B) radiation (–nm).

Reductions in the ozone column have led to substantial increases in UV-B radiation at earth’s surface with the amount dependent on atmospheric and geographic fac-tors (Madronich et al., ; WMO, ).

As CFCs can remain in the upper atmosphere for 40– years.