منابع مشابه
Low fluence.
The question of the appropriate extrapolation to low dose has long been a subject of controversy. A linear no-threshold model is favored by regulatory bodies as the basis of RBE assignments and estimates of radiation hazards to the general population. This model is largely supported by extensive application of the linear-quadratic survival formula "fitted" statistically to a wide variety of exp...
متن کاملThe Presence of Both Very Low Fluence and Low Fluence Responses
We have examined phytochrome regulated changes in transcript abundance for 11 different light regulated mRNAs in developing pea buds. Fluence-response curves were measured for changes in transcript abundance in response to red light pulses in both the low and very low fluence ranges. Most trnscripts show only low fluence responses, with a threshold of approximately 10 micromoles per square mete...
متن کاملFluence-response curves and action spectra for the very low fluence and the low fluence response for the induction of kalanchoë seed germination.
Germination of Kalanchoë blossfeldiana Poelln. seeds is absolutely light-requiring. Germination of one seed is the result of one out of three reactions, viz. the very low fluence response (VLFR), the low fluence response (LFR) and the high fluence response/high irradiance response. In order to demonstrate the involvement of phytochrome for both photoresponses, i.e. VLFR and LFR, action spectra ...
متن کاملLow-fluence vs. standard fluence hair removal: A contralateral control non-inferiority study
INTRODUCTION Laser hair removal at lower fluences, delivered under certain conditions, may retain the efficacy of high-fluence lasers while improving tolerability. We performed a pilot study comparing the efficacy, safety and tolerability of laser hair removal using traditional settings compared to lower fluences, delivered from a larger handpiece and under vacuum. MATERIAL AND METHODS Fourte...
متن کاملCharacterizing low fluence thresholds for in vitro photodynamic therapy.
The translation of photodynamic therapy (PDT) to the clinic has mostly been limited to superficial diseases where traditional light delivery is noninvasive. To overcome this limitation, a variety of mechanisms have been suggested to noninvasively deliver light to deep tissues. This work explores the minimum amount of light required by these methods to produce a meaningful PDT effect in the in v...
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ژورنال
عنوان ژورنال: Laser and Particle Beams
سال: 1991
ISSN: 0263-0346,1469-803X
DOI: 10.1017/s026303460000344x