75 research outputs found
Perspectieven voor de radiotherapie
REDE
uitgesproken bij de aanvaarding
van het ambt van buitengewoon hoogleraar
in de experimentele radiotherapie
aan de Brasmus Universiteit te Rotterdam
op woensdag, 25 maart 1981
Stralingsgevoeligheid van tumoren : een experimenteel onderzoek bÄł de rat
Het belangrijkste doel van een radiologische behandeling van eenmaligne
aandoening is het bereiken van een genezing door het doden van alle tumorcellen.
Het streven van de klinische radiotherapie is om het maligne proceste
genezen met een minimum aan ongemakken voor de patient; de radioloog beziet
dus zijn patient als geheel en let niet alleen op het tumorweefseL
Indien men echter de foetoren wil bestuderen welke de therapeutische resultaten
beĂŻnvloeden zal men zijn aandacht in de eerste plaats op hetmaligne
proces moeten richten. Het mag als de taak van de radiobioloog worden gezien
om gegevens te verzamelen over de reacties van een tumor op bestraling. Bij
voorkeur maakt hij doorbij gebruik van experimentele modellen, waarin o!le
samenstellende factoren afzonderlijk kunnen worden bestudeerd
Quantum Physics Exploring Gravity in the Outer Solar System: The Sagas Project
We summarise the scientific and technological aspects of the SAGAS (Search
for Anomalous Gravitation using Atomic Sensors) project, submitted to ESA in
June 2007 in response to the Cosmic Vision 2015-2025 call for proposals. The
proposed mission aims at flying highly sensitive atomic sensors (optical clock,
cold atom accelerometer, optical link) on a Solar System escape trajectory in
the 2020 to 2030 time-frame. SAGAS has numerous science objectives in
fundamental physics and Solar System science, for example numerous tests of
general relativity and the exploration of the Kuiper belt. The combination of
highly sensitive atomic sensors and of the laser link well adapted for large
distances will allow measurements with unprecedented accuracy and on scales
never reached before. We present the proposed mission in some detail, with
particular emphasis on the science goals and associated measurements.Comment: 39 pages. Submitted in abridged version to Experimental Astronom
Association of common genetic variants with brain microbleeds
OBJECTIVE: To identify common genetic variants associated with the presence of brain microbleeds (BMBs). METHODS: We performed geno
Improved microcirculation in irradiated tumours
The response of the tumour micro-circulation of a mouse mammary tumour to fractionated irradiation was investiagted by the quantitative analysis of cinematographically recorded micro-angiograms made of tumours, growing in a sheet-like fashion with a thickness of about 50 μ. The results indicate that, during a course of fractionated radiotherapy with daily fractions of 576 rads, there is an improvement of the tumour microcirculation, which is most marked at the 7th treatment day when the tumours have just regressed beyond their initial size. The technique of growing sheet-like tumours in a modification of the Algire chamber system (called the “sandwich” system), does not only allow the direct observation, recording or measurement of the various aspects of the tumour microcirculation, but also permits direct estimation of the local oxygenation (redox) state of the tumour tissue by using micro-fluorometric methods. This work was undertaken while the author was on leave from the Radiobiological Institute TNO. It was supported by grant No. USPHS 2-02-CA-06519. Part of this work was presented at the symposium “Time and Dose Relationships in Radiation Biology as Applied to Radiotherapy”, held at Carmel, California, September 1969
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