A cytological study of the ovary ofRhodnius prolixus. II. Oocyte differentiation

1972 ◽  
Vol 137 (4) ◽  
pp. 385-415 ◽  
Author(s):  
Erwin Huebner ◽  
Everett Anderson
Keyword(s):  
Cytological Study ◽  
Oocyte Differentiation

CYTOLOGICAL AND IMMUNOCYTOCHEMICAL DIAGNOSIS OF TUMOR PLEURITIS

2017 ◽  
Vol 63 (6) ◽  
pp. 894-899
Author(s):  
Viktor Novik ◽  
A. Nefedova ◽  
Ye. Yakubo ◽  
O. Ivanov ◽  
Yekaterina Shalina ◽  
...  
Keyword(s):  
Tumor Cells ◽  
Malignant Tumor ◽  
Cytological Study ◽  
False Negative ◽  
Unknown Primary ◽  
Cytological Examination ◽  
Immunocytochemical Studies ◽  
Negative Conclusion ◽  
Primary Localization

Cytological examination of smears from the sediment after centrifugation of pleural fluids was performed in 479 patients who underwent examination and treatment at our institution in 2014-2016. In 249 (52%) patients tumor cells were not detected in smears, in 230 (48%) observations a suspicion (28 observations) or a confident conclusion (202 observations) on the presence of malignant tumor cells in the exudates was cytologically expressed. In 38 cases immunocytochemical studies was additionally performed. In two observations a false-negative conclusion about the absence of tumor cells in smears was expressed. The sensitivity of the cytological study in the diagnosis of malignant pleuritis was 99.0%. Affirmative cytological conclusions on the presence of malignant pleuritis were given in 87.0% of observations, suspicious cytological responses - in 12.0% of cases. Immunocytochemical studies significantly expanded the possibilities of cytological research and were of great importance in the diagnosis of metastases of tumors of unknown primary localization.

Fragile X Syndrome: Clinical & Cytological Study in North Karnataka

2017 ◽  
Vol 8 (2) ◽  
Author(s):  
DR G.S.KADA KOL ◽  
DR M M PA TIL ◽  
DR S V PATIL ◽  
DR.BHEEMSHETTY S. PATIL ◽  
DR R S BULA GOUDA
Keyword(s):  
Fragile X Syndrome ◽  
Cytological Study ◽  
Fragile X

scholarly journals Cytological Study on Induced Apospory in Ferns

CYTOLOGIA ◽  
1962 ◽  
Vol 27 (1) ◽  
pp. 79-96 ◽  
Author(s):  
Chihiro Takahashi
Keyword(s):  
Cytological Study

Fine structural observations on oocyte development in monogeneans

Parasitology ◽  
1976 ◽  
Vol 73 (1) ◽  
pp. 13-23 ◽  
Author(s):  
D. W. Halton ◽  
S. D. Stranock ◽  
Anne Hardcastle
Keyword(s):  
Meiotic Prophase ◽  
Species Differences ◽  
Ultrastructural Changes ◽  
Cell Periphery ◽  
Annulate Lamellae ◽  
Cellular Activity ◽  
Cortical Granules ◽  
Primary Oocyte ◽  
Nucleolar Volume ◽  
Oocyte Differentiation

SummaryThe ultrastructural changes accompanying oocyte differentiation in the ovaries of the monogeneans, Diclidophora merlangi, Diplozoon paradoxum and Calicotyle kröyeri have been described. In each case, oogenesis in the ovary proceeds as far as meiotic prophase in the primary oocyte. A three-stage sequence of development based on oocyte morphology is proposed: (1) Oogonia and early, immature primary oocytes are typically undifferentiated, with chromatin-laden nuclei occupying most of the cell volume. The cytoplasm contains small clumps of mitochrondria and unattached ribosomal aggregates. There is evidence of mitosis and, in later stages, meiotic prophase is indicated by the appearance of nuclear synaptonemal complexes. (2) Maturing primary oocytes are characterized by increased nucleolar volume associated with the production of RNA for export to the cytoplasm. An organized GER and Golgi apparatus are established and involved in the synthesis and packaging of membrane-limited cortical granules. Annulate lamellae and nucleolus-like bodies appear in the cytoplasm and, with development, the cells increase in size and, peripherally, become interdigitated. (3) Mature primary oocytes represent a resting phase when cellular activity is minimal. Golgi disappear and the ER fragments or becomes reduced in dimensions. Mitochondria and free ribo-somes are numerous and cortical granules move to the cell periphery. The cells separate and, when mature, are released from the ovary. There are minor species differences in oocyte ultrastructure and development.

OBSERVATIONS ON CADMIUM DAMAGE AND REPAIR IN RAT TESTES AND THE EFFECTS ON THE PITUITARY GONADOTROPHS

1962 ◽  
Vol 24 (4) ◽  
pp. 453-NP ◽  
Author(s):  
M. ALLANSON ◽  
R. DEANESLY
Keyword(s):  
Subcutaneous Injection ◽  
Cadmium Chloride ◽  
Cytological Study ◽  
Interstitial Cells ◽  
Germinal Epithelium ◽  
Seminiferous Tubules ◽  
Interstitial Tissue ◽  
Long Term Effects ◽  
Single Subcutaneous Injection

SUMMARY Cadmium chloride, in a single subcutaneous injection, can destroy spermatogenic and interstitial cells in the rat testis (Pařízek, 1957) and produce changes in the pituitary. The interstitial tissue is restored by ingrowths from the tunica and full androgen secretion returns before there is any regeneration of germinal epithelium. A cytological study has been made of the peripheral and central pituitary gonadotrophs; the latter revert almost to normal as the interstitial tissue regenerates, whereas the former retain characteristic castration features, unless there is also regeneration of the germinal epithelium. This seems to indicate that in the normal testis there is a hormone contribution from the seminiferous tubules as well as from the interstitial cells. The long-term effects of cadmium on the testis depend on the dose. Early stages of tubule restoration have been studied, but after administration of 0·9 mg., actual proliferation of the germinal epithelium was rarely found—only in four out of twenty rats, 113 or 142 days after injection.

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