A recent preliminary communication by Feulgenl on a conjugated nucleic acid of pancreas prompts me to publish my own results on the same subject. Feulgen prepared a nucleic acid from pancreas by enzymatic digestion of p-nucleoprotein. This acid could be split into phosphoric acid, levulinic acid, furfurol, thymine, cytosine, guanine, and adenine. He found that an alkali salt of guanylic acid co...

Similarities and differences become evident from comparisons of centromeric and non-centromeric banding patterns in plant and animal chromosomes. Similar to C and G-banding in animals (at least most of the reptiles, birds and mammals), centromeric and nucleolus-organizing region bands as well as interstitially and/or terminally located non-centromeric bands may occur in plants, depending on the...

A special feature of eggs of several species of annelids and molluscs is the formation of a polar lobe at stage-specific intervals during the cleavage phase. In the scaphopod Dentalium, a polar lobe develops at the first, the second and the third cleavage (Wilson, 1904). The cytoplasm set apart in the polar lobes is ultimately confined to the D blastomere and its derivative cells. Wilson observ...

Feulgen bands can be obtained at the sites of constitutive heterochromatin in the chromosomes of Anemone blanda, Fritillaria lanceolata and Scilla siberica, simply by means of a short or extended acid hydrolysis. Extended hydrolysis gives positive bands in A. blanda and F. lanceolata and negative bands in S. siberica. Short hydrolysis gives no bands in A. blanda and S. siberica but gives negati...

Asteraceae familyası hem dünyada de ülkemizde geniş cins ve tür zenginliğine sahip bitki familyaları arasında yer almaktadır. Bu öneme binaen bu büyük önemli aileye ait beş farklı cinsten türün (Pulicaria vulgaris (L.) Gaertner, Picris strigosa Bieb., Cichorium intybus L., Lactuca viminea J. Presl & C. Chondrilla juncea L.) Feulgen boyama tekniği kullanılarak kromozom sayımı detaylı kar...

Flow cytometry (FCM) was adapted to measure ploidy values in megakaryocytes isolated from normal guinea pigs and African green monkeys. The FCM approach was validated by microscopic identification of electronically sorted SN and higher ploidy cells and by comparisons with Feulgen microdensitometry on the same samples. Sorted 8N populations contained only megakaryocytes and were completely free ...