I N A preliminary note, we reported that low temperature treatment of frogs after total-body exposure to x-rays greatly prolongs their survival (I). The present studies were initiated to determine: I) whether this altered radiosensitivity is due to a decrease in the rate of development of radiation injury or actually reflects a more rapid and complete recovery from the effects of irradiation an...

sarcomas into this scheme, but soon it became apparent that there are carcinomas and sarcomas of different sensitivity; this involved further investigations to trace the origin of these differences with the object of foretelling the radiosensitivity of a tumour from its histological features revealed by biopsies, and of fixing the plan of the treatment according to these findings. The most rema...

A “radiosensitivity index” (LTJmean longevity) was correlated with the mean longevity and dry weight of 37 insect species (both sexes of 12 species) representing eight orders. Curvilinear regression analysis reIating radiosensitivity to mean longevity and mean dry weight indicated that 46.3% of the observed variation could be attributed to longevity and 32.6% to the dry weight of the species. I...

Introduction: The identification of perchlorate (ClO4) on Mars [1,2] has led to the possibility that complete redox couples are available for microbial metabolism in contemporary surface environments [3]. Perchlorate-reducing bacteria (PRB) utilize ClO4 and chlorate (ClO3) as terminal electron acceptors due to the high reduction potential [3]. Additionally, ClO4 salts have been suggested as a p...

Seventy mucoid mutants retaining the phenotypic properties of the ultraviolet-induced lon strains of Escherichia coli K-12 were isolated after treatment of strain MQ259 (lon+) with ozone. They produce mucoid colonies at 37 C on minimal agar, are abnormally sensitive to radiation, and tend to grow in long aseptate filaments after irradiation with ultraviolet light. Results indicate also that ozo...

In order to design radiation-hardened LSIs for space applications, single event transient (SET) effects on cascade voltage switch logic (CVSL) circuits have been investigated using SPICE. Static CVSL and clocked CVSL (CVSL) circuits have been successfully fabricated utilizing a double polysilicon double metal N-well CMOS technology. A CVSL half adder, a CVSL half adder and a CVSL full adder hav...

Effects of ultraviolet-B radiation on the photosynthesis of seagrasses (Halophila engelmanni Aschers, Halodule wrightii Aschers, and Syringodium filiforme Kütz) were examined. The intrinsic tolerance of each seagrass to ultraviolet-B, the presence and effectiveness of photorepair mechanisms to ultraviolet-B-induced photosynthetic inhibition, and the role of epiphytic growth as a shield from ult...

Modern treatment planning systems for three-dimensional treatment planning provide three-dimensionally accurate dose distributions for each individual patient. These data open up new possibilities for more precise reporting and analysis of doses actually delivered to irradiated organs and volumes of interest. A new method of summarizing and reporting inhomogeneous dose distributions is reported...

We demonstrate solar-blind photodetectors (PDs) by employing AlN thin films on Si(100) substrates with excellent temperature tolerance and radiation hardness. Even at a bias higher than 200 V the AlN PDs on Si show a dark current as low as ~ 1 nA. The working temperature is up to 300°C and the radiation tolerance is up to 10(13) cm(-2) of 2-MeV proton fluences for AlN metal-semiconductor-metal ...