Über einen empfindlichen Nachweis des äußeren lichtelektrischen Effektes von Hämoglobin und anderen körpereigenen Stoffen

✍ Scribed by Ludwig Nicolai

• Publisher: Springer
• Year: 1967
• Tongue: English
• Weight: 644 KB
• Volume: 293
• Category: Article
• ISSN: 0031-6768
• DOI: 10.1007/bf00364347

✦ Synopsis

External photoelectric phenomena of hemoglobin and other substances from the living body can be observed and measured by electric brush discharges more easily than by the spark-counter of GREI~ACttER. By increasing the electric potential between the anode and the organic cathode to 7--17 kV and making it discontinuous in the form of impulses of 12--25 kcps and a mark to space ratio of 1 : 10 it is possible to find a region of high sensitivity of the brush discharges to illumination within the visible range. The number of discharges is a function of the cathode substance, the number of molecules per unit area, and the wave-length and intensity of the incident light. The use of Cobalamine (Vit. B12 ) as a standard is described. At a maximum it yields 800--1300 discharges per second and other substances may be compared to it. The observational conditions and the instrumentation for counting the discharges are indicated.