Radiation research. Supplement最新文献_第7页

Effects of acute exposure to high-energy protons on primates. 高能质子急性暴露对灵长类动物的影响。

Radiation research. Supplement Pub Date : 1969-04-01 DOI: 10.1097/00043764-196904000-00035

S. Taketa, B. Castle, W. H. Howard, C. C. Conley, W. Haymaker, C. Sondhaus

引用次数: 13

Proton-irradiation effects in primates. 灵长类动物的质子辐照效应。

Radiation research. Supplement Pub Date : 1967-01-01

R Zellmer, J Culver, J E Pickering

引用次数: 0

Inactivation and trapped radicals in dry trypsin exposed to ultraviolet light. 暴露于紫外光下的干胰蛋白酶的失活和自由基捕获。

Radiation research. Supplement Pub Date : 1967-01-01

H B Steen, T Brustad

引用次数: 0

Radiological properties of beams of high-energy protons. 高能质子束的放射学特性。

Radiation research. Supplement Pub Date : 1967-01-01

B Larsson

引用次数: 0

Effects of sonic irradiation on yeast. 超声波辐照对酵母的影响。

Radiation research. Supplement Pub Date : 1967-01-01

V W Burns

引用次数: 0

Thermal spike effects in heavy-ion tracks. 重离子磁道中的热尖峰效应。

Radiation research. Supplement Pub Date : 1967-01-01

A Norman

引用次数: 0

A mortality determinant in nonuniform exposures of the mammal. 哺乳动物非均匀暴露的死亡率决定因素。

Radiation research. Supplement Pub Date : 1967-01-01 DOI: 10.2307/3583720

V. Bond, C. V. Robinson

{"title":"A mortality determinant in nonuniform exposures of the mammal.","authors":"V. Bond, C. V. Robinson","doi":"10.2307/3583720","DOIUrl":"https://doi.org/10.2307/3583720","url":null,"abstract":"It is widely accepted that survival in most mammals exposed uniformly to penetrating radiation in the LD50(30) (hematological syndrome) range depends primarily on maintenance of a critical level of neutrophils and platelets in the peripheral blood. This minimum level depends in turn on the survival or proliferative integrity of a critical number or fraction of the stem cells in the total active bone marrow mass (1). From dose-survival curves established for bone marrow stem cells in the mammal (2-4), it appears that the dose-effect curve is closely approximated by an exponential function over a range of exposures that more than spans the LD50(30) range. It is reasonable to assume that subunits of the total marrow mass have the same number of stem cells per unit mass, and that the stem cells of each subunit, considered independently, are subject to the same exponential dose-effect relationship as that for the total marrow. It is further reasonable to assume that a surviving stem cell will, after irradiation, contribute mature cells to the peripheral blood at a rate that is independent of its location in the marrow. The foregoing statements form a logical basis for a stem cell model for survival; that is, survival of the animal depends on the same critical surviving fraction of stem cells, whether following uniform or nonuniform exposure. This fraction can be calculated from values for (1) the relative amounts of active bone marrow (stem cells) in different parts of the body; (2) the doses to these parts; and (3) the dosesurvival curve for stem cells.","PeriodicalId":77888,"journal":{"name":"Radiation research. Supplement","volume":"40 1","pages":"265-75"},"PeriodicalIF":0.0,"publicationDate":"1967-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73725148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Mutation-induced and nuclear inactivation in Neurospora crassa using radiations with different rates of energy loss. 不同能量损失率辐射对粗神经孢子虫突变诱导和核失活的影响。

Radiation research. Supplement Pub Date : 1967-01-01 DOI: 10.2307/3583709

F. D. de Serres, B. Webber, J. Lyman

引用次数: 15

Excitation, dissipative, and emissive mechanisms in biochemicals. 生物化学中的激发、耗散和发射机制。

Radiation research. Supplement Pub Date : 1967-01-01 DOI: 10.2307/3583706

L. Augenstein, E. Yeargers, J. Carter, DeVaughn Nelson

{"title":"Excitation, dissipative, and emissive mechanisms in biochemicals.","authors":"L. Augenstein, E. Yeargers, J. Carter, DeVaughn Nelson","doi":"10.2307/3583706","DOIUrl":"https://doi.org/10.2307/3583706","url":null,"abstract":"Triplet states, because of their long lifetimes and reactive properties, are of fundamental concern to radiation biologists. Our interest in the role of these states in radiation damage was stimulated by the observation that the ratios of fluorescence to phosphorescence (F/P) excited by x irradiation of the aromatic amino acids and trypsin are less, by a factor of about 10 to 100, than those observed for ultraviolet (uv) excitation of the lowest-lying excited states (1). This implies that x irradiation greatly enhances the relative population of excited triplet states or that fluorescence or phosphorescence quantum efficiencies are changed. Three mechanisms were proposed to account for this enhanced triplet population: (1) intersystem crossing, from singlet to triplet manifold during the energetic cascade from high-lying excited states to the lowest-energy, emitting states; (2) the interaction and breakup of collective excitations; or (3) direct spin exchange between incident, slow electrons and orbital electrons in the absorbing molecules. Possible methods to investigate these mechanisms are, respectively, (1) irradiation with subionizing vacuum uv (4 to 10 eV); (2) irradiation with high-energy vacuum uv (-25 eV); and (3) irradiation with slow electrons (<100 eV). Preliminary evidence bearing on the first and third possibilities has come recently from studies in our two laboratories and is summarized below. Experimental details are given in companion reports (2, 3). Following the initial absorption of energy, a series of relaxation and emissive events will occur which ultimately leave the absorbing system (which now may be altered chemically) in its ground state. The individual processes may be very fast ('10-15 second for light emission) or very slow (100 seconds for decay of triplet","PeriodicalId":77888,"journal":{"name":"Radiation research. Supplement","volume":"13 1","pages":"128-38"},"PeriodicalIF":0.0,"publicationDate":"1967-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85214963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The effect of high-energy particle irradiation on the vestibular mechanism in rabbits. 高能粒子辐照对家兔前庭机制的影响。

Radiation research. Supplement Pub Date : 1967-01-01 DOI: 10.2307/3583737

L. W. Mcdonald

引用次数: 0