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Biomedical subjects

J A Plaza

Publications and source records attributed to J A Plaza.

8 recordsLinked to original sources
PubMed2006

Light coupling into an optical microcantilever by an embedded diffraction grating.

By measuring the excitation efficiency of an optical waveguide on a diffraction grating one can accurately register the changes in the incidence angle of the exciting light beam. This phenomenon was applied to detect ultrasmall deflections of silicon dioxide cantilevers of submicrometer thickness that were fabricated with corrugation on top to act as diffraction grating couplers. The power of light coupled into the cantilevers was monitored with a conventional photodetector and modulated using mechanical vibration of the cantilever, thus changing the spatial orientation of the coupler with respect to the incident light beam. The technique can be considered as an alternative to the methods known for detection of cantilever deflection.

Journal Article↗
PubMed1993

Adenomyoepithelioma of the breast. Report of two cases.

The clinical and pathologic findings of two cases of adenomyoepithelioma of the breast are reported. Aspiration cytology was performed in one case and was interpreted as malignant. Conversely, histological features revealed their typical architectural arrangement and immunohistochemical profiles confirmed that myoepithelial (actin and S-100 protein +) and epithelial (keratin and epithelial membrane antigen +) cells were active components in both tumours.

Adenoma↗
PubMed1992

Adnexal tumour of probable Wolffian origin. Report of a case.

An adnexal tumour of probable Wolffian origin occurring in a 36 year old woman is reported. The lesion was asymptomatic and incidentally discovered during laparotomy. No recurrences have been demonstrated to date. Its origin from Wolffian remnants is briefly.

Adnexal Diseases↗
PubMedDate not supplied

Cytologic, cytochemical, immunocytochemical and ultrastructural diagnosis of a sacrococcygeal chordoma in a fine needle aspiration biopsy specimen.

The cytologic, cytochemical, immunocytochemical and ultrastructural findings on the aspirated material are presented for the case of a 57-year-old man with sacrococcygeal chordoma diagnosed by fine needle aspiration biopsy. Cytologically, two types of cellular elements were differentiated: medium-sized cells with few cytoplasmic vacuoles and classic physaliferous cells. Both types showed marked cytoplasmic positivity for keratin and S-100 protein; the absence of nuclear positivity in the physaliferous cells was notable. Ultrastructural study demonstrated the existence of true intracytoplasmic vacuoles and frequent rough endoplasmic reticulum-mitochondria complexes. The cytologic differential diagnosis with chondrosarcoma, myxoid liposarcoma, ependymoma and metastases of mucosecretory carcinomas is reviewed.

Biopsy, Needle↗