Relationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the corpuscles of stannius and the ultimobranchial gland in the goldfish, Carassius auratus L. /

The relationship between photoperiod, plasma concentration of ionic calcium and the histology of the prolactin-secreting cells of the rostral pars distalis of the pituitary gland, the Corpuscles of Stannius and the Ultimobranchial gland were investigated. Neither the plasma concentration of ionic calcium nor histologically apparent prolactin cell activity could be correlated with photoperiod. Some evidence of a photoperiodic effect on both the Corpuscles of Stannius and the Ultimobranchial gland was obtained. The expected reciprocal relationship between the activity of these glands was not obvious at the histological level . Quantitative and qualitative analysis at the light microscope level revealed, however, that the hormone prolactin-secreting eta cells of the rostral pars distalis and the hypocalcin-secreting cells of the Corpuscles of Stannius may be arranged in a lamellar pattern comprized of synchronous bands of cells in like-phase of a secretory cycle consisting of four stages - synthesis, storage, release and reorganization. Such synchronized cell cycles in these glands have not heretofore been described in literature. It is suggested that the maintenance of at least 255? of the cells in any one phase of the cycle ensures a supply of the required hormone at all times.

Charles Clarke Chapman, ca. 1942

Original mounted photograph, signed by the photographer [Hartsook], as well as by C. C. Chapman [Affectionately yours, Father], ca. 1942.

Charles Clarke Chapman, Los Angeles, California, ca. 1895

Studio portrait photograph of Charles Clarke Chapman, Los Angeles, California, ca. 1895

Original Chapman home ranch packing house, Santa Ysabel, California, ca. 1900

Original Chapman home ranch packing house, Santa Ysabel, California, ca. 1900. [copy print]

Frank M. Chapman, Jr. son of Frank M. and Wilhelmina Chapman, Chicago, Illinois, ca. 1891.

Studio portrait of Frank M. Chapman, Jr. son of Frank M. and Wilhelmina Chapman, Chicago, Illinois, ca. 1891.

Frank C. Chapman, Chicago, Illinois, ca. 1890

Studio portrait of Frank C. Chapman, Chicago, Illinois, ca. 1890.

Grant Chapman, Clarke Chapman, and Frank Chapman Jr., Palmetto Grove, Covina, California, ca. 1915

Left to right: Grant Chapman, Clarke Chapman, and Frank Chapman Jr., sons of Frank Marion and Wilhelmina Zillen Chapman, on a porch at Palmetto Grove, Covina, California, ca. 1915.

Grounds of Palmetto Grove, estate of Frank Marion Chapman, Covina, California, ca. 1915

Grounds of Palmetto Grove, estate of Frank Marion Chapman, Covina, California, ca. 1915.

Charles C. Chapman with his daughter Ethel and son Stanley, ca. 1905.

Remnant of a portrait photograph of Charles C. Chapman with his daughter Ethel and son Stanley, ca. 1905.

Samuel James Chapman, ca. 1948

Samuel James Chapman, brother of Charles Clarke Chapman, ca. 1948.

Zella and Grant Chapman, ca. 1914

Zella and Grant Chapman, outside a hotel, ca. 1914.