John A. Synowiec

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The purpose of the study was a comparison of clinical and pathological assessment of cervical lymph nodes metastases in advanced carcinoma of larynx and the hypopharynx. The outspread, size and number of the nodes metastases to the particular regions of the neck was taken into analysis. The differences and occurrence in clinical and pathological assessment(More)
The 45 cases in which the Cisplatin on 5-Fluorouracil was administered for treatment of advanced head and neck cancer was taken into analysis. The chemotherapy was used as: a) a palliation b) an induction chemotherapy before surgery, c) an induction chemotherapy before radiotherapy. The discussion of usefulness of this line of conduct was undertaken.
The flucrescence decay of Chlorella pyrenoidosa has been investigated under a variety of conditions in the picosecond and nanosecond time regions. Most of the fluorescence is accounted for by an expression of the form I(t) = I0exp-(At+Bt1/2) though an additional exponential term is required to include a weak component of lifetime 32 ps observable only at(More)
We report fluorescence lifetimes for in vivo chlorophyll a using a time-correlated single-photon counting technique with tunable dye laser excitation. The fluorescence decay of dark-adapted chlorella is almost exponential with a lifetime of 490 ps, which is independent of excitation from 570 nm to 640 nm. Chloroplasts show a two-component decay of 410 ps(More)
Much effort has been expended in the measurement of the fluorescence decay kinetics of chlorophyll in vioo (for examples see papers cited in Harris et al., 1976). To the present time most techniques have lacked either the precision or the time resolution required for accurate determinations. Recent work using high-powered lasers has been hampered asa result(More)
A technique for measuring relative quantum yields of fluorescence with a picosecond streak camera is described. We show that Chlorella pyrenoidosa exhibit an intensity dependent quantum yield when irradiated with single picosecond light pulses. This effect also occurs under conditions that inhibit the activity of the reaction centres, which can therefore be(More)
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