Abstract:
:Asynchronously growing V79 cells were assayed for mutation induction following exposure to hyperthermia either immediately before or after being irradiated with 60Co gamma rays. Hyperthermia exposures consisted of either 43.5 degrees C for 30 min or 45 degrees C for 10 min. Each of these heat treatments resulted in a survival level of 42%. For all sequences of combined treatment with hyperthermia and radiation, cell killing by gamma rays was enhanced. Mutation induction by gamma rays was enhanced when heat preceded gamma irradiation, but no increase was observed when heat was given after gamma exposures. Treatment at 45 degrees C for 10 min gave a higher yield in mutants at all gamma doses studied compared to treatment at 43.5 degrees C for 30 min. When heat-treated cells were incubated for different periods before being exposed to gamma rays, thermal enhancement of radiation killing was lost after 24 h. In contrast, only 5-6 h incubation was needed for loss of mutation induction enhancement.
journal_name
Radiat Resjournal_title
Radiation researchauthors
Banerjee S,Bhaumik G,Bhattacharjee SBsubject
Has Abstractpub_date
1989-08-01 00:00:00pages
305-12issue
2eissn
0033-7587issn
1938-5404journal_volume
119pub_type
杂志文章abstract::This paper evaluates the global vitamin D effective UV (UV(vitd)) irradiances under cloudy conditions at a subtropical, southern hemisphere site. The UV(vitd) irradiances were analyzed on a horizontal plane and sampled at 5-min intervals over 18 months so that a wide range of parameters including cloud conditions, sol...
journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR1936.1
更新日期:2010-05-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
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更新日期:2012-06-01 00:00:00
abstract::Single crystals of guanine hydrobromide monohydrate, in which the guanine base is protonated at N7, were X-irradiated at 8 and 65 K. Using K-band ESR, ENDOR, and field-swept-ENDOR (FSE) techniques, the crystals were studied between 8 K and room temperature. There was evidence for five different radicals, RI-RV, immedi...
journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1991-02-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
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更新日期:2012-05-01 00:00:00
abstract::Accurate assessment of risks of long-term space missions is critical for human space exploration. It is essential to have a detailed understanding of the biological effects on humans living and working in deep space. Ionizing radiation from galactic cosmic rays (GCR) is a major health risk factor for astronauts on ext...
journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR15062.1
更新日期:2018-06-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
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更新日期:2017-08-01 00:00:00
abstract::Chomentowski, M., Kellerer, A. M. and Pierce, D. A. Radiation Dose Dependences in the Atomic Bomb Survivor Cancer Mortality Data: A Model-Free Visualization. The standard approach to obtaining nominal risk coefficients for radiation-related cancer involves fitting linear or linear-quadratic dose-response functions. Th...
journal_title:Radiation research
pub_type: 杂志文章
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更新日期:2000-03-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1985-12-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/rr3190
更新日期:2004-07-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/rr3067
更新日期:2003-11-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1986-03-01 00:00:00
abstract::We have tested an 836.55 MHz field with North American Digital Cellular (NADC) modulation in a 2-year animal bioassay that included fetal exposure. In offspring of pregnant Fischer 344 rats, we tested both spontaneous tumorigenicity and the incidence of induced central nervous system (CNS) tumors after a single dose o...
journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1999-09-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/0033-7587(2001)155[0785:odfrti]2.0.co;2
更新日期:2001-06-01 00:00:00
abstract::The non-human primate has been a useful model for studies of human acute radiation syndrome (ARS). However, to date structural changes in various parts of the intestine after total body irradiation (TBI) have not been systematically studied in this model. Here we report on our current study of TBI-induced intestinal s...
journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR14191.1
更新日期:2015-11-01 00:00:00
abstract::Single crystals of the co-crystalline complex of 1-methyluracil and 9-ethyladenine were X-irradiated and studied using EPR, ENDOR and FSE spectroscopic techniques at 10 K. All together seven radicals were identified, and experimental evidence for at least one more species, as well as for a very low population of radic...
journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1989-03-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/0033-7587(2001)155[0402:tbeiro]2.0.co;2
更新日期:2001-03-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/rr3191
更新日期:2004-08-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR15130.1
更新日期:2019-05-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR15137.1
更新日期:2018-12-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1995-07-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/3155
更新日期:2004-04-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1983-11-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR1943.1
更新日期:2010-01-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1990-02-01 00:00:00
abstract::CD34 antigen is a novel marker for human hematopoietic stem/progenitor cells. In the present study, two cell fractions, CD34low and CD34high, were prepared from steady-state human peripheral blood on the basis of CD34 antigen expression. The colony-forming unit megakaryocytes (CFU-Meg) contained in each cell fraction ...
journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/rr3396
更新日期:2005-07-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:10.1667/RR1745.1
更新日期:2009-08-01 00:00:00
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journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1989-10-01 00:00:00
abstract::Ionizing radiations induce mutations which can be detected both in coding sequences (Hprt locus) by measuring the frequency of 6-thioguanine-resistant cells and in minisatellite sequences by DNA fingerprint analysis. We analyzed the effects of irradiation with low-energy protons (31 keV/pm) and, for comparison, with u...
journal_title:Radiation research
pub_type: 杂志文章
doi:
更新日期:1997-09-01 00:00:00