Abstract：
:The influence of antibiotic decontamination of Pseudomonas contamination of the GI tract prior to whole-body neutron or gamma irradiation was studied. It was observed that for fission neutron doses greater than 5.5 Gy, cyclotron-produced neutron doses greater than 6.7 Gy, and 137Cs gamma-ray doses greater than 14.4 Gy, the median survival time of untreated rats was relatively constant at 4.2 to 4.5 days, indicating death was due to intestinal injury. Within the dose range of 3.5 to 5.5 Gy of fission neutrons, 4.9 to 6.7 Gy of cyclotron-produced neutrons, and 9.6 to 14.4 Gy of gamma rays, median survival time of these animals was inversely related to dose and varied from 12 to 4.6 days. This change in survival time with dose reflects a transition in the mechanisms of acute radiation death from pure hematopoietic, to a combination of intestinal and hematopoietic, to pure intestinal death. Decontamination of the GI tract with antibiotics prior to irradiation increased median survival time 1 to 5 days in this transitional dose range. Contamination of the intestinal flora with Pseudomonas aeruginosa prior to irradiation reduced median survival time 1 to 5 days in the same radiation dose range. Pseudomonas-contaminated animals irradiated within this transitional dose range had maximum concentrations of total bacteria and Pseudomonas in their livers at the time of death. However, liver bacteria concentration was usually higher in gamma-irradiated animals, due to a smaller contribution of hematopoietic injury in neutron-irradiated animals. The effects of both decontamination of the GI tract and Pseudomonas contamination of the GI tract were negligible in the range of doses in which median survival time was dose independent, i.e., in the pure "intestinal death" dose range. Finally, despite the marked changes in survival time produced by decontamination or Pseudomonas contamination in the "transitional dose range," these treatments had little effect on ultimate survival after irradiation as measured by the LD50/5 day and the LD50/30 day end points. The implications of these results with respect to treatment of acute radiation injury after whole-body irradiation are discussed.
journal_name
Radiat Resjournal_title
Radiation researchauthors
Geraci JP,Jackson KL,Mariano MSsubject
Has Abstractpub_date
1985-12-01 00:00:00pages
395-405issue
3eissn
0033-7587issn
1938-5404journal_volume
104pub_type
杂志文章abstract：:Clinicians involved in conventional radiation therapy are very concerned about the dose-response relationships of normal tissues. Before proceeding to new clinical protocols, radiation biologists involved with conformal proton therapy believe it is necessary to quantify the dose response and tolerance of the organs an...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/r3016
更新日期：2003-07-01 00:00:00
abstract：:The structural maintenance of chromosome 1 (Smc1) protein is a member of the highly conserved cohesin complex and is involved in sister chromatid cohesion. In response to ionizing radiation, Smc1 is phosphorylated at two sites, Ser-957 and Ser-966, and these phosphorylation events are dependent on the ATM protein kina...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR2402.1
更新日期：2011-03-01 00:00:00
abstract：:Dose-response curves for micronucleus (MN) formation were measured in Chinese hamster V79 and xrs6 (Ku80(-)) cells and in human mammary epithelial MCF10A cells in the dose range of 0.05-1 Gy. The Chinese hamster cells were exposed to 1 GeV/nucleon iron ions, 600 MeV/nucleon iron ions, and 300 MeV/nucleon iron ions (LE...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR0967.1
更新日期：2007-12-01 00:00:00
abstract：:We investigated the effect of irradiation on the kinetic characteristics of amino acid and glucose transport, and the effect on the activity of the cell membrane-bound enzyme 5'-nucleotidase and on the receptor-mediated stimulation of cyclic adenosine monophosphate synthesis by prostaglandin E1. Irradiation inhibited ...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1985-12-01 00:00:00
abstract：:Using atomic force microscopy (AFM), we have investigated neutron-induced DNA double-strand breaks in plasmids in aqueous solution. AFM permits direct measurement of individual DNA molecules with an accuracy of a few nanometers. Furthermore, the analysis of the DNA fragment size distribution is non-parametric, whereas...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1998-12-01 00:00:00
abstract：:Prior to whole-liver irradiation (0, 15, 25 Gy) rats were not treated, placed on a protein-deficient diet for 2 weeks, administered cyclophosphamide, and/or depleted of intracellular glutathione by injection with buthionine sulfoximide and diethyl maleate. At various times (0 to 84 days) after 0- and 25-Gy liver irrad...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1992-03-01 00:00:00
abstract：:This report compares the deterministic effects from an alpha-particle-emitting radionuclide, (239)PuO(2), and a beta-particle emitter, (144)Ce in fused aluminosilicate particles (FAP). The studies were conducted in beagle dogs of both genders exposed by inhalation to aerosols of the radionuclides. The initial lung bur...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1999-12-01 00:00:00
abstract：:A novel technique has been employed to investigate the simultaneous damage to DNA components induced by soft X rays (1.5 keV) and low-energy electrons (0-30 eV) in thin films of thymidine deposited on glass and tantalum substrates and irradiated under atmospheric pressure and temperature. The films were surrounded by ...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR13584.1
更新日期：2014-06-01 00:00:00
abstract：:Blockers of the renin-angiotensin-aldosterone system (RAAS) ameliorate cognitive deficits and some aspects of brain injury after whole-brain irradiation. We investigated whether treatment with the angiotensin II type 1 receptor antagonist L-158,809 at a dose that protects cognitive function after fractionated whole-br...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/rr2560.1
更新日期：2011-07-01 00:00:00
abstract：:Although tissue mast cells are derived from the bone marrow, some descendants of bone marrow-derived precursors retain the ability to proliferate and differentiate into mast cells even after localization in the skin. The purpose of the present study was to determine the D0 values for mast-cell precursors in the bone m...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1983-01-01 00:00:00
abstract：:Some recent epidemiological studies have shown a positive association between cancer incidence and exposure to electromagnetic (EM) fields. Evidence from in vitro studies indicates that this effect could be due to synergistic interaction between EM fields and tumor promoters. However, no dose-response data related dir...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1991-04-01 00:00:00
abstract：:To characterize the role of the cerebrovascular response in the development of brain injury after focal irradiation, 125I sources were implanted in frontal white matter of the brain of normal dogs; dose was 20 Gy, 7.5 mm from the source. Cerebral blood flow, vascular volume and mean transit time of blood were quantifi...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1992-05-01 00:00:00
abstract：:Tissue-incorporated radionuclides impart radiation energy over extended periods of time depending on their effective half-lives. The capacity of vitamin A dissolved in soybean oil to protect against the biological effects caused by internal radionuclides is investigated. The radiochemicals examined are DNA-binding 125...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1994-07-01 00:00:00
abstract：:An analytical expression is developed for calculating the average energy deposited by an ion in a volume with dimensions less than the range of the secondary electrons produced. The expression is obtained by including two additional terms in an energy-restricted linear-energy-transfer equation. The usual energy-restri...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1992-12-01 00:00:00
abstract：:Radiation-induced cell death is thought to be caused by nuclear DNA damage that cannot be repaired. However, in this study we found that a delayed increase of mitochondrial reactive oxygen species (ROS) is responsible for some of the radiation-induced cell death in normal human fibroblast cells. We have previously rep...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR13772.1
更新日期：2015-04-01 00:00:00
abstract：:Energy deposition clusters in the nanometer scale have been investigated systematically in electron, proton, and alpha-particle tracks. The mean absolute frequency distributions of ionization clusters in nanometer sites have been computed. For locally multiply damaged sites and especially for double-strand breaks, the...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1993-06-01 00:00:00
abstract：:In this study, we assessed the efficacy of unilamellar 110-nm liposomes encapsulating the chelating agent diethylenetriaminepentaacetic acid (DTPA) in plutonium-exposed rats. Rats were contaminated by intravenous administration of the soluble citrate form of plutonium. The comparative effects of liposomal and free DTP...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR14968.1
更新日期：2018-05-01 00:00:00
abstract：:To evaluate the usefulness of the transgenic Muta mouse for investigating radiation-induced mutations in vivo, we have examined the effects of whole-body X irradiation and compared them to the effects of ultraviolet light. The spontaneous mutation frequencies in young adults were about 7 x 10(-5) in the spleen, liver ...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1997-08-01 00:00:00
abstract：:The Escherichia coli nth gene encodes endonuclease III, which catalyses the glycolytic removal of various oxidized thymine residues from DNA. A truncated version of nth, with the prokaryotic regulatory sequences removed, was ligated into the retrovirus-based vector pZipneoSV(X)1 and transfected into the radiosensitive...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1992-10-01 00:00:00
abstract：:The effects of 60Co gamma rays on calcitonin gene-related peptide (CGRP)-immunoreactive nerve fibers and neuropeptide Y (NPY)-immunoreactive nerve fibers were examined in mesenteric blood vessels of rats. Using a free-floating immunostaining streptavidin-biotin peroxidase complex method combined with a nickel-enhancem...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1998-01-01 00:00:00
abstract：:We studied heat-induced apoptosis and loss of clonogenicity in Rat-1 fibroblasts, thermotolerant Rat-1 (TT Rat-1), Rat-1 transfected with the human hsp-70 gene (M21) and Rat-1 transfected with the human c-myc proto-oncogene (Rat-1:myc). Relative to Rat-1, TT Rat-1 and M21 cells are heat-resistant, but Rat-1:myc cells ...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1996-03-01 00:00:00
abstract：:The possibility of a large-scale acute radiation exposure necessitates the development of new methods that could provide rapid individual dose estimates with high sample throughput. The focus of the study was an intercomparison of laboratories' dose-assessment performances using gene expression assays. Lithium-heparin...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR3236.1
更新日期：2013-08-01 00:00:00
abstract：:Chinese hamster ovary cells were irradiated with 250 kVp X rays and analyzed for the presence of DNA double-strand breaks using either polycarbonate filter elution or pulsed-field agarose gel electrophoresis at neutral pH. Reduction in DNA length detected by filter elution was produced as a nonlinear function of incre...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1990-12-01 00:00:00
abstract：:There is a need for minimally invasive biomarkers that can accurately and quickly quantify radiation exposure. Radiation-responsive proteins have applications in clinical medicine and for mass population screenings after a nuclear or radiological incident where the level of radiation exposure and exposure pattern comp...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR13927.1
更新日期：2015-07-01 00:00:00
abstract：:Late radiation damage to pig skin has been assessed at 104 weeks after exposure to sources of 90Sr/90Y (Emax 2.2 MeV) and 170Tm (Emax 0.9 MeV). Damage was assessed from measurements of dermal thickness in histological sections of irradiated skin and was compared with that of unirradiated skin to establish the relative...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1993-03-01 00:00:00
abstract：:Whether inner-shell ionizations of DNA atoms, called core ionizations, are critical events for cell inactivation by ionizing radiations such as 100 keV electrons and gamma rays has been investigated. The number of core ionizations in DNA atoms per gray of the two types of radiations is calculated from various Monte Ca...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR0451.1
更新日期：2007-04-01 00:00:00
abstract：:The survival of synchronous G1 or asynchronous Chinese hamster ovary cells in vitro to heat treatment may depend on the cellular population density at the time of heating and/or as the cells are cultured after heating. The addition of lethally irradiated feeder cells may increase survival at 10(-3) by as much as 10- t...
journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1984-01-01 00:00:00
abstract：:Abstract Double-strand breaks (DSBs) can be generated in the DNA of mammalian cells when heat-labile sites induced by ionizing radiation within a clustered DNA damage site are thermally transformed to single-strand breaks (SSBs) and combine with other SSBs or heat-labile sites in the opposite DNA strand. When this the...
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
abstract：:The primary risk factors of multiple myeloma are age, race and sex, but several studies have found an association between radiological hazards and multiple myeloma. The purpose of this nested case-control study was to investigate whether workers with chronic low-level exposure to internally deposited uranium at the Oa...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR1607.1
更新日期：2009-06-01 00:00:00
abstract：:To improve radioimmunotherapy with Auger electron emitters, we assessed whether the biological efficiency of (125)I varied according to its localization. A-431 and SK-OV-3 carcinoma cells were incubated with increasing activities (0-4 MBq/ml) of (125)I-labeled vectors targeting the cell membrane, the cytoplasm or the ...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR1359.1
更新日期：2008-08-01 00:00:00
