DNA CONTENT OF PLACENTAL NUCLEI

Dna Content of Placental Nuclei

The DNA content of individual nuclei in four immature human placentas was determined by microspectrophotometric analysis of Feulgen-stained sections. The absence of mitosis in the syncytiotrophoblast, taken together with the finding of a diploid unimodal distribution, at a time of rapid placental growth, indicated that the syncytiotrophoblast possessed little or no intrinsic reproductive capaci...

DNA content of dormant barley leaf nuclei and the synthesis of RNA and DNA during germination.

The nature of the RNA synthesized during early germination appears to be controversial. In onion [ 1 ] , lettuce [2] , Vicia faba [3] , Phaseolus vulgaris [4] and Triticum vuZgare [ 51 RNA species synthesized include predominantly ribosomal and transfer RNA. In Triticum durum, Chen et al. [6] found no mRNA synthesis during the first 24 hr of germination; synthesis was triggered at a later time....

The absence of dietary effects on the DNA content of liver nuclei of the adult rat.

Changes in the Dna Content of Adrenal Medulla Nuclei of Rats Intermittently Exposed to Cold

In the adrenal medulla of rats exposed intermittently to cold (+4 degrees C) for 100 and 300 hours, a considerable decrease (24 to 40 per cent) of the DNA content per nucleus was observed, followed by restoration to normal or above normal values within 10 days after the withdrawal of the stimulus. The findings were obtained with a scanning integrating histophotometer, and confirmed by microinte...

Constancy of Dna Content in Adrenal Medulla Nuclei of Cold-treated Rats

Reports of changes in DNA content of certain types of cells following exposure to conditions of stress has led to the suggestion that two kinds of DNA may be present. One is genetic DNA, and the other is called "metabolic" DNA. In a further attempt to investigate the possibility of this phenomenon, determinations of DNA content were made on Feulgen-stained nuclei of adrenal glands and kidneys i...