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CYTOCHEMICAL EVIDENCE FOR VARIED DNA COMPLEXES IN THE NUCLEI OF UNDIFFERENTIATED CELLS
It has been found that heteroand euchromat in incorporate thymidine at different times. Lima-deFaria (6) observed that in the nuclei of grasshopper testes the label was incorporated differently intoExpand
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PHYSIOLOGICAL AND BIOCHEMICAL CHANGES DURING INSECT DEVELOPMENT
Publisher Summary This chapter explores the various physiological and biological changes occurring in an insect's body during the various stages of the insect's development. Insects taken together asExpand
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Changes in the Amount of Nucleic Acids and Free Nucleotides during Early Embryonic Development of Sea Urchins
DURING the early embryonic period, the embryo of the sea urchin1,2, and also those of the frog3 and the chicken4, live upon deoxypentose nucleic acid, stored within the cytoplasm of the embryo; thisExpand
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Pupal Diapause caused by Vitamin Deficiency
  • I. Agrell
  • Biology, Medicine
  • Nature
  • 17 February 1951
IN an earlier investigation1, I established that the pupal diapause of the butterfly Phalera bucephala L. is characterized by a very low respiratory quotient, RQ 0.1–0.3. During consecutiveExpand
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Changes of Histone Composition in the Developing Chick Embryo
THE possible role of histones as gene suppressors has been discussed by many authors1–5. If histones do have such a function, one might expect to find some qualitative or quantitative changes in theExpand
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Localization of Some Hydrogen-Activating Enzymes in Insects During Metamorphosis
  • I. Agrell
  • Chemistry, Medicine
  • Nature
  • 17 December 1949
As a link in accontinuous study of the intermediate metabolism during insect metamorphosis, I have also made an attempt to determine the localization of some dehydrogenases. Pupæ of CalliphpruExpand
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A Diurnal Cycle in the Mitotic Activity of Ascites Tumour Cells in Mice
OBSERVATIONS of a diurnal variation of frequency of mitosis in the normal tissues of the mouse show a diphasic rhythm in the skin epidermis and epithelia of oesophagus, epididymis and duodenalExpand
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Cytoplasmic and nuclear growth during the proliferation of Ehrlich ascites tumour cells in mice
SummaryObservations on Ehrlich ascites tumour cells revealed that during tumour growth there was a continuous enlargement of the average cell size and a consequential change in the cell sizeExpand
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Cytochemical studies on DNA-complexes during cell multiplication and cell differentiation.
Abstract 1. 1. The Feulgen technique was applied to various materials of cells in division and undergoing cellular growth and fifferentiation. A quantitative evaluation was ade throughExpand
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