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Biomedical subjects

H Tanke

Publications and source records attributed to H Tanke.

8 recordsLinked to original sources

HOME: highly optimized microscope environment.

The Highly Optimized Microscope Environment (HOME) is a computerized microscope designed to assist pathologists and cytotechnicians in clinical routine tasks. The prototype system consists of a IBM-PC compatible computer and a light microscope in which a built-in high-resolution computer display image is superimposed on the optical image of the specimen. Also, a manually operated encoding stage and objective turret encoder are used to provide continuous monitoring of the stage coordinates and microscope magnification to the computer. This allows any position on a slide to be uniquely defined and makes it possible to measure interactively lengths and areas larger than the size of the microscope field. Software, written in the C language and operating under the MS-DOS/MS-Windows environment, is controlled by means of a mouse-driven cursor moving over menu light-buttons displayed on the microscope image. The HOME microscope workstation is potentially useful in a wide range of applications such as i) tagging information on particular cells and tissue structures that can thus be accurately located and relocated, ii) performing morphometric measurement, differential counting, and stereological assessment of biological specimens, and iii) training and educating laboratory personnel. Finally, HOME will offer in the near future a user-friendly interface for automatic image processing of cells and tissue entities in interactively selected specimen areas.

Animals

Early replication signals in nuclei of Chinese hamster ovary cells.

DNA replication sites generally known as replicon domains were resolved as individual replication signals in interphase nuclei of permeabilized Chinese hamster ovary cells by immunofluorescent microscopy. Biotin-11-dUTP was utilized as a tool to label newly replicated DNA in permeable cells and to study the distribution of nascent DNA in pulselabel and in pulsechase experiments. Active sites of DNA replication were visualized in exponentially growing cells and in synchronized cultures throughout the S phase. Fluorescent images of replication sites were analyzed by standard fluorescence microscopy and in three dimensions by confocal laser scanning microscopy. The rapid increase in number of discrete foci of newly replicated DNA is an indication that DNA synthesis starts at limited number of sites in mammalian nuclei rather than at thousands of foci at the same time.

Animals

[The modular image analysis computer for assessment of prognosis in testicular tumors].

Since 1981 a total of 107 patients with non-seminomatous germ cell tumors of the testis (NSGCT) in clinical stage I were assigned to a "wait and see" protocol. At a median follow-up of 40 months (4-100) thirty seven pts. (35%) relapsed with 84% of these within the first year. Employing the Hedley-technique out of 50 primary tumor-tissues available nuclear suspensions were obtained, staining according to the DNA-Feulgen-procedure and evaluated by the modular image analysis computer (MIAC, Leitz, FRG). In 67% hyperpentaploidy was found in the cases with progression while only 23% exhibited a greater than 5c-rate in the NED-group. With logistic regression achieving a p-value of 0.0296 hyperpentaploidy has to be considered a significant prognosticator in NSGCT/CS I.

Dysgerminoma

Identification of rosette-forming cells in permanent preparations.

A method is described for the identification of leucocytes in permanent cytocentrifuge rosette preparations made with the fluorescent methyl green pyronin-SITS (MPS) staining technique. The percentages of rosettes in stained slides agree well with the results obtained with the conventional haemocytometer method. Application of the MPS staining to cytocentrifuge preparations permits reliable morphological differentiation between free and rosetting leucocytes, and should be particularly valuable in studies on lymphocyte subpopulations in patients.

Centrifugation