What's the difference between pycnite and subcolumnar?
Pycnite
Definition:
(n.) A massive subcolumnar variety of topaz.
Example Sentences:
Subcolumnar
Definition:
(a.) Having an imperfect or interrupted columnar structure.
Example Sentences:
(1) A monoclonal antibody specific for columnar epithelium (RGE 53) gave a positive reaction in endocervical columnar cells and in some immature metaplastic cells but was negative in subcolumnar reserve cells, squamous (metaplastic) cells, dysplastic cells, and most cases of carcinoma in situ.
(2) SCUC probably arises either from basal cells of the cervical squamous epithelium, or gland cells of the endocervical epithelium, or still from subcolumnar endocervical reserve cells.
(3) Most cells in 13 examined squamous carcinomas revealed a cytokeratin phenotype detected in ectocervical basal cells and endocervical subcolumnar reserve cells: 8+, 14+, 18+, 19+, 4-, 10-, 13-.
(4) However, in the endocervix the protein detection was useful to follow the evolution of the subcolumnar cells to simple squamous metaplasia.
(5) This study favors an epithelial origin and a squamoid nature of subcolumnar reserve cells.
(6) Furthermore, there appear to be variants of pseudostratified columnar epithelium, i.e., the usual bronchial type lining the laryngeal ventricle, and a type with a thicker subcolumnar cell compartment that is found on the laryngeal surface of the epiglottis.
(7) In addition, subcolumnar basal cells actively synthesized RNA, reflecting their ability for further growth and development.
(8) Our studies reveal the presence of a relatively large number of vimentin-positive and T6-positive (Langerhans) cells in normal ectocervical stratified squamous epithelium, a small number in endocervical columnar epithelium, and a larger number in subcolumnar reserve cell hyperplasia and in immature squamous metaplasia.
(9) Autoradiographic investigations demonstrated that glandular cells and subcolumnar basal cells synthesize DNA in premenopausal and postmenopausal women.
(10) Expression of keratins 5, 14 and 17 in endocervical subcolumnar reserve cells was detected by means of immunohistochemical studies using polypeptide specific monoclonal antibodies.
(11) It is postulated that squamous cell carcinoma, adenocarcinoma, and mixed adenosquamous cell carcinoma of the uterine cervix all have a common cell or origin, the subcolumnar reserve cell.
(12) In cycling women the estrogen-responsive protein was identified in the subcolumnar cells of the endocervix, whereas in the ectocervix the protein was detected mainly in the parabasal and intermediate cell layers but alternating with unstained areas.
(13) These results support the hypothesis of an epithelial origin of reserve subcolumnar cells, and suggest that precocious squamous differentiation seems to take place in metaplastic cells of the human endocervix.
(14) We have analyzed the expression of cytokeratin polypeptides in subcolumnar reserve cells of the human uterine endocervical mucosa and the other epithelial cells using immunoperoxidase and immunofluorescence microscopy as well as by applying two-dimensional gel electrophoresis to microdissected cytoskeletal preparations.
(15) Using the double label indirect immunofluorescence technique we have studied vimentin-positive cells present in normal ecto- and endocervical epithelium, subcolumnar reserve cell hyperplasia, and squamous metaplastic and dysplastic epithelium of the uterine cervix.
(16) This finding is further evidence in support of the theory that glandular and squamous intraepithelial neoplasia in the cervix are closely related conditions, possibly with a common origin in the subcolumnar reserve cell.
(17) The new monoclonal antibody DE-K14, specific for cytokeratin 14, proved a specific marker of subcolumnar reserve cells in the endocervix.
(18) A positive reaction was also found in subcolumnar reserve cell hyperplasia, in squamous metaplastic and dysplastic cells, and in (squamous) carcinoma in situ.
(19) This study presents a detailed ultrastructural examination of the human endocervix with evidence for the differentiation of subcolumnar basal cells into mucus-secreting cells and ciliated columnar cells.
(20) Similarities in cytokeratin expression were found between dysplasia and carcinoma in situ on one hand and subcolumnar reserve cell hyperplasia and squamous metaplasia on the other.