FLOW-THROUGH MICROCUVETTE FOR FLUOROMETRIC DETERMINATION OF CHLOROPHYLL1

This paper describes a flow-through microcuvette for determination of chlorophyll with the Turner Designs model 10 fluorometer. The device approximately doubles the speed of repetitive chlorophyll determinations. With a single-standard calibration procedure, chlorophyll concentrations in the approximate range of 0.01-2.0 ug/mL (in solvent extracts) can be determined with a relative error of less than 3 percent.     

Assessing the physiological state of woody plants by parameters of chlorophyll fluorescence in the bark of annual shoots

The relative yield of variable chlorophyll fluorescence in the bark of annual shoots of woody plants was measured with a portable pulse-modulated fluorometer designed for this purpose at the Department of Biophysics (Biological Faculty, Moscow State University). Experiments were performed to study the response of this parameter to external influences (treatment with an herbicide, water loss, etc.). The results demonstrated the possibility of reliably recording the parameters of fluorescence in the annual shoots of various woody plants without damaging these shoots. It is concluded that measurements of chlorophyll fluorescence in the bark of woody plants can be used for analyzing changes in the physiological state of tree stands under the effects of natural and anthropogenic factors.     

冷原子荧光测定痕量汞影响空白值的因素

阐述了冷原子荧光法测定痕量汞影响空白值的诸因数，提出了消除方法。