Currently

methods of utilizing fluorescence in the diagnosis of cancers are roughly divided into two kinds: The method of fluorescence sensibilization and the method of direct observation of the inherent fluorescence. This paper reported the study of the electronic spectrum of the tissue homogenate of human stomach

and quantitatively investigated the center of luminescence. According to the observation of the inherent fluorescence

an early diagnosis of malignant tumors may be made preliminarily.The tissue homogenate of human stomach has a relatively strong photoabsorption in near ultraviolet and violet areas. The photoatosorption in violet area is the absorption of the purine compound in biologic tissues. It is evident that the electronic spectrum is influenced by the transition of the leading conjugated π electrons.It is obvious from the results of the experiment that utilizing ultraviolet light with different wave lengths to excite the gastric homogenate

roughly same integrated protein fluorescence emission peaks were obtained. Comparing this emission peak with that of the tryptophan (348nm)

some displacement was found

and this is just the fluorescence characteristic of the protein B. Therefore

it is concluded that under the excitation of ultraviolet light

the photospectrum of aromatic compound is the chief characteristic of that of the gastric homogenate.From the result of the experiment

it is noticed that the emission in red area of the ultraviolet-excited gastric homogenate was basically originated from the transition of the ρ electrons of purine cyclic group of hemoglobin. It possesses distinct common characteristics with ths fluorescence spectrum of the human whole blood

hemoglobin and hematoporphyrin. Therefore

the photoemission of gastric homogenate in visible area was chiefly originated from the hemoglobin molecules of the tissues.Once the pathologic lesions developed in tissues

it will inevitably lead to changes in the molecular composition

molecular structure as well as physicochemical environment around the emission center

eausing changes in the state of emission center as a result of changes in inherent fluorescence. In the comparison of the spectrum of inherent fluorescence in normal tissue with that in cancer tissues

it is obvious that there is significant difference between the emission peak of the fluorescence of cancer tissues and that of the normal tissue homogenate.