✦ LIBER ✦

Pattern of DNA Replication of the Sex Chromosomes in Three Males, Two with XYY and One with XXYY Karyotype

✍ Scribed by BOCZKOWSKI, K.; CASEY, M. D.

Book ID: 109655810
Publisher: Nature Publishing Group
Year: 1967
Tongue: English
Weight: 416 KB
Volume: 213
Category: Article
ISSN: 0028-0836
DOI: 10.1038/213928a0

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Fertile male mice with three sex chromos

Fertile male mice with three sex chromosomes: Evidence that infertility in XYY male mice is an effect of two Y chromosomes

✍ Patricia A. Hunt; Eva M. Eicher 📂 Article 📅 1991 🏛 Springer 🌐 English ⚖ 1008 KB

In the mouse XYY males are sterile, presumably because pairing abnormalities resulting from the presence of three sex chromosomes lead to meiotic breakdown. We have produced male mice, designated XYY\*X, that have three sex chromosomes pairing regions but only one intact Y chromosome. Unexpectedly X

Male gametophyte development and two dif

Male gametophyte development and two different DNA classes of pollen grains in Rumex acetosa L., a plant with an XX/XY1Y2 sex chromosome system and a female-biased sex ratio

✍ Błocka-Wandas, Magdalena ;Sliwinska, Elwira ;Grabowska-Joachimiak, Aleksandra ;M 📂 Article 📅 2007 🏛 Springer 🌐 English ⚖ 396 KB

Saliva and serum samples were collected

Saliva and serum samples were collected from eight healthy volunteers every two hours during a 26-hour period. Melatonin concentrations were measured by radioimmunoassay after chloroform extraction using radioiodinated melatonin as a tracer. Five of the subjects had high serum melatonin levels at night (peak levels higher than 75 pg/ml); in three subjects the highest serum melatonin concentration was 20-40 pg/ml. All subjects had low levels (P <0.001, was obtained for all detectable value pairs (n= 73). The regression and correlation coefficients were almost equal for the peak values of melatonin and during the rising and descending phases of the secretion patterns. However, no significant correlation was found between low daytime salivary and serum concentrations when calculated separately. In the five high-secretors the melatonin levels in saliva reflected reliably the changes in serum, but in the three low-secretors the correlation between salivary and serum melatonin was not significant. The proportion of melatonin found in saliva decreased with increasing serum melatonin levels. Circadian rhythm parameters were estimated by single cosinor analysis. The acrophases did not differ significantly within a subject in the concomitant measurements of serum and salivary melatonin. The measurements of salivary melatonin levels seem valid for studies on melatonin rhythms, but the melatonin concentrations measured in saliva do not always consistently reflect the absolute concentrations in blood.

✍ Maija-Liisa Laakso; Tarja Porkka-Heiskanen; Aino Alila; Dag Stenberg; Gunnar Joh 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 622 KB