GAMMA RADIATION SENSITIVITY OF THE SPIDER BEETLE, GIBBIUM PSYLLOIDES (COLEOPTERA: PTINIDAE)

1972 ◽  
Vol 104 (10) ◽  
pp. 1551-1556 ◽  
Author(s):  
John H. Brower ◽  
Hilda C. Scott
Keyword(s):  
Gamma Radiation ◽  
Radiation Sensitivity ◽  
Radiation Resistant ◽  
Eggs And Larvae ◽  
All Treatment

AbstractThe effects of seven gamma radiation dosages from 5 to 100 krad on all metamorphic stages of the spider beetle, Gibbium psylloides (Czenpinski), were studied. Five kilorads prevented development of adults from treated eggs and larvae. Some adults emerged from the pupal cocoon at all treatment levels except 50 and 100 krad, but their longevity was greatly reduced. Adults were fairly resistant to sterilizing effects of the radiation. Twenty kilokrads was not completely sterilizing to either males or females, but fecundity was greatly reduced. The longevity of treated adults was significantly reduced, but some survived for 20 weeks after a 20-krad exposure. Adults and pupae of this species were more radiation resistant than were most other stored-product Coleoptera.

Gamma Radiation Sensitivity of Listeria monocytogenes

1989 ◽  
Vol 52 (9) ◽  
pp. 610-613 ◽  
Author(s):  
C. N. HUHTANEN ◽  
R. K. JENKINS ◽  
D. W. THAYER
Keyword(s):  
Listeria Monocytogenes ◽  
Gamma Radiation ◽  
Irradiation Dose ◽  
Organic Materials ◽  
Culture Media ◽  
Radiation Sensitivity ◽  
Chicken Meat ◽  
Previous Exposure ◽  
Radiation Resistant

Seven strains of Listeria monocytogenes were irradiated in culture media or in mechanically deboned chicken meat. The survivor plots were quadratic curves when cultures were in the log phase of growth or when they were irradiated in chicken meat; cultures in the senescent phase of growth showed linear responses to irradiation. Cultures from cells surviving an irradiation dose of 1.5 kGy were no more radiation resistant that those which had had no previous exposure to irradiation. Cultures centrifuged and resuspended in water were more sensitive to radiation than those resuspended in solutions containing organic materials. These studies indicated that a dose of 2 kGy was sufficient to destroy 1 × 104 cells of L. monocytogenes.

scholarly journals Radiation sensitivity of Acinetobacter spp. and their radicidation for preservation of meat at low temperature

2009 ◽  
Vol 35 (2) ◽  
pp. 33-40 ◽  
Author(s):  
Sahadev Chandra Saha ◽  
Balu Anand Chopade
Keyword(s):  
Low Temperature ◽  
Gamma Radiation ◽  
Dose Level ◽  
Radiation Sensitivity ◽  
Acinetobacter Radioresistens ◽  
Radiation Resistant ◽  
Acinetobacter Spp ◽  
Natural Contamination ◽  
Gamma Radiations

Acinetobacter spp. isolated from meat to gamma radiations. Seven species of Acinetobacter viz. A. lwoffii M1; A. baumannii M8; A. calcoaceticus M19; A. junii M20; A. johnsonnii M23; A. haemolyticus M27 and A. radioresistens M25 isolated from meat were exposed to gamma radiation at the dose level of 0.1 to 10 KGy. The D10 value of Acinetobacter was found highest 1.25 KGy in A. radioresistens M25, which was 4 to 8 times higher than other genospecies of Acinetobacter. Acinetobacter radioresistens M25 contains one plasmid of 45 Kb. The radicidation dose of 4 KGy gamma radiations was found to be sufficient to eliminate the natural contamination of meat and contamination by Acinetobacter. To eliminate radiation resistant Acinetobacter contamination a dose of 4 to 5 KGy was required. Development of the radicidation process for preservation of meat to eliminate Acinetobacter as contaminants at low temperature is one of the new and interesting phenomena. Attempts of finding the appropriate radicidation dose for preservation of meat at low temperature will open up new avenues for commercial preservation of meat.DOI: http://dx.doi.org/10.3329/bmrcb.v35i2.2490Online: 11 August 2009Bangladesh Med Res Counc Bull 2009; 35: 33-40

Neutron Radiation Effects on Lubricants and O-Rings for Target and Accelerator Applications

2021 ◽  
Vol 1024 ◽  
pp. 127-133
Author(s):  
Matteo Ferrari ◽  
Aldo Zenoni ◽  
Yong Joong Lee ◽  
Alberto Andrighetto
Keyword(s):  
Gamma Radiation ◽  
Radiation Damage ◽  
Radiation Effects ◽  
Nuclear Reactor ◽  
Neutron Radiation ◽  
Radioactive Isotopes ◽  
Structural Level ◽  
Radiation Resistant ◽  
Under Construction ◽  
Neutron Radiation Effects

Lubricants and O-rings are necessarily used for the construction of many accelerator-driven facilities as spallation sources or facilities for the production of radioactive isotopes. During operation, such component will absorb high doses of mixed neutron and gamma radiation, that can degrade their mechanical and structural properties. Experimental radiation damage tests of these components are mandatory for the construction of the facility. Methodologies for irradiation in nuclear reactor mixed fields and post-irradiation examination of lubricating oils, greases and O-rings were developed and are here presented. Samples were characterized with standard mechanical and physical-chemical tests. Parametric studies on the dose rate effects have been performed on O-rings. A case studies for a specific O-ring application in a gate valve has been developed. Some of the tested samples showed a dramatic change of their properties with dose, while others remain stable. Results were collected on nine commercial greases, on one oil and on four commercial elastomeric O-rings. The most radiation resistant among the selected products are now considered for application in facilities under construction. The main mechanisms of neutron and gamma radiation damage on these polymers were investigated at the mechanical and structural level.

scholarly journals Downregulation of MicroRNA-330 Correlates with the Radiation Sensitivity and Prognosis of Patients with Brain Metastasis from Lung Cancer

2017 ◽  
Vol 42 (6) ◽  
pp. 2220-2229 ◽  
Author(s):  
Li-Peng Jiang ◽  
Zhi-Tu Zhu ◽  
Yue Zhang ◽  
Chun-Yan He
Keyword(s):  
Lung Cancer ◽  
Logistic Regression ◽  
Radiation Therapy ◽  
Survival Rate ◽  
Brain Metastasis ◽  
Cox Regression ◽  
Radiation Sensitivity ◽  
Extracranial Metastasis ◽  
Radiation Resistant ◽  
N Stage

Background: The present study sought to explore the role of microRNA-330 (miR-330) in predicting the radiation response and prognosis of patients with brain metastasis (BM) from lung cancer (LC). Methods: Patients with BM from LC were identified and classified into radiation-sensitive and radiation-resistant groups according to the overall survival rate, local and distant recurrence rate after conventional whole-brain radiation therapy. Quantitative realtime polymerase chain reaction (qRT-PCR) was used to detect miR-330 expression in serum. Receiver operating characteristic (ROC) curves were used to evaluate the prognostic value of miR-330 for the radiation sensitivity of brain metastasis from LC. Related clinical factors for radiation sensitivity were assessed by logistic regression analysis, and a survival analysis was conducted using COX regression and the Kaplan-Meier method. Results: MiR-330 exhibited lower expression in the radiation-sensitive group than in the radiation-resistant group. The area under the ROC curve of miR-330 for predicting radiation sensitivity was 0.898 (optimal cut-off value, 0.815), with a sensitivity of 71.7% and a specificity of 90.1%. After radiation therapy, patients with low miR-330 expression, compared to patients with high miR-330 expression, displayed a lower survival rate and a median survival time. MiR-330 expression was correlated with extracranial metastasis, maximum BM diameter, tumor-node-metastasis (TNM) stage and node (N) stage. Logistic regression and COX regression analyses revealed that extracranial metastasis, TNM stage, N stage and miR-330 expression were factors that influenced both radiation sensitivity and individual prognostic factors in patients with BM from LC. Conclusions: These findings indicate that the downregulation of miR-330 correlates with radiation sensitivity and poor prognosis in patients with BM from LC.

Deinococcus swuensis sp. nov., a gamma-radiation-resistant bacterium isolated from soil

2013 ◽  
Vol 51 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Jae-Jin Lee ◽  
Hyun Ji Lee ◽  
Gi Seon Jang ◽  
Ja Myoung Yu ◽  
Ji Yoon Cha ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Resistant Bacterium ◽  
Radiation Resistant

Hymenobacter Taeanensis Sp. Nov., Radiation Resistant Bacterium Isolated from Coastal Sand Dune

2021 ◽  
Author(s):  
Ji Hee Lee ◽  
Jong-Hyun Jung ◽  
Min-Kyu Kim ◽  
Han Na Choe ◽  
Sangyong Lim
Keyword(s):  
Gamma Radiation ◽  
Sand Dune ◽  
Rrna Gene ◽  
Sand Sample ◽  
Coastal Sand Dune ◽  
Respiratory Quinone ◽  
Protein Coding ◽  
Radiation Resistant ◽  
Coastal Sand ◽  
The 16S Rrna Gene

Abstract An aerobic, Gram-stain-negative, non-motile, non-spore-forming, rod-shaped, and light pink-colored bacterial strain, designated TS19T, was isolated from a sand sample obtained from a coastal sand dune after exposure to 3 kGy of gamma radiation. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that the isolate was a member of the genus Hymenobacter and was most closely related to H. wooponensis WM78T (98.3% similarity). Strain TS19T and H. wooponensis showed resistance to gamma radiation with D10 values (i.e., the dose required to reduce the bacterial population by tenfold) of 7.3 kGy and 3.5 kGy, respectively. The genome of strain TS19T consists of one contig with 4,879,662 bp and has a G+C content of 56.2%. The genome contains 3,955 protein coding sequences, 44 tRNAs, and 12 rRNAs. The predominant fatty acids of strain TS19T were iso-C15:0, summed feature 4 (iso-C17:1 I and/or anteiso-C17:1 B), summed feature 3 (C16:1 ω6c and/or C16:1 ω7c), and C16:1 ω5c. The major polar lipids were phosphatidylethanolamine, and one unknown aminophospholipid. The main respiratory quinone was menaquinone-7. Based on the phylogenetic, physiological, and chemotaxonomic characteristics, strain TS19T represents a novel species, for which the name Hymenobacter taeanensis sp. nov. is proposed. The type strain is TS19T (=KCTC 72897T =JCM 34023T).

Gamma Radiation Sensitivity of Enterobacter sakazakii in Dehydrated Powdered Infant Formula

2006 ◽  
Vol 69 (6) ◽  
pp. 1434-1437 ◽  
Author(s):  
J. W. LEE ◽  
S. H. OH ◽  
J. H. KIM ◽  
H. S. YOOK ◽  
M. W. BYUN
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Infant Formula ◽  
Marked Effect ◽  
Radiation Sensitivity ◽  
Sensory Properties ◽  
Hot Water ◽  
Powdered Infant Formula ◽  
Enterobacter Sakazakii ◽  
Nutritional Studies

The observed Enterobacter sakazakii D10-values for tryptic soy broth and dehydrated powdered infant formula were 0.27 ± 0.05 and 0.76 ± 0.08 kGy, respectively. A decrease of approximately 3 log in the dehydrated powdered infant formula was obtained by irradiation with 3.0 kGy or rehydration with hot water at 80°C. No recoverable bacteria were found in the powdered infant formula irradiated at 5.0 kGy and stored, either before or after rehydration. A radiation dose of up to 5.0 kGy had no marked effect on the sensory properties of the dehydrated powdered infant formula after rehydration and heating. Gamma radiation could potentially be used to inactivate E. sakazakii in dehydrated powdered infant formula; however, nutritional studies need to be conducted before the use of radiation can be recommended.

Hymenobacter swuensis sp. nov., a Gamma-Radiation-Resistant Bacteria Isolated from Mountain Soil

2013 ◽  
Vol 68 (3) ◽  
pp. 305-310 ◽  
Author(s):  
Jae-Jin Lee ◽  
Sathiyaraj Srinivasan ◽  
Sangyong Lim ◽  
Minho Joe ◽  
Sang Hee Lee ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Resistant Bacteria ◽  
Radiation Resistant
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