FEEDBACK INHIBITORS ON ERYTHROPOIESIS

Feedback inhibition of erythropoiesis induced in anaemic Xenopus.

Serum from normal Xenopus, when injected into anaemic Xenopus, causes reduction in both DNA and protein synthesis in erythroid cells as indicated by in vitro culture of the blood cells. Experiments with erythrocyte-conditioned medium, reveal that this inhibitory substance can be recovered from mature erythrocytes. Sephadex G-25 fractionation of normal serum and haemolysate demonstrates that the...

Studies on erythropoiesis.

Effect of altitude on erythropoiesis.

Vohunteer subjects participating in this study were inhabitants of Lima and Morococha. Group I was composed of 7 healthy males between the ages of 18 and 30 living in the sea-level city of Lima, where baseline studies were performed. The group was then transported by car over a 4 hour period to Morococha ( 4530 meters above sea level ) . They remained there for 7 days, confined to living quarte...

the effect of audio-taped feedback and conferencing on efl students’ writing ability

: بازخورد یکی از جنبه ها ی ضروری هر دوره ی آموزشی نگارشی – زبانی انگلیسی می باشد که به زبان آموزان مهارت های مورد نیاز جهت بهبود توانایی نگارشی را می آموزد. این تحقیق، با استفاده از طرح پیش آزمون، پس آزمون، و پسا آزمون ، سعی دارد تا تأ?یر نوع بازخورد مدرس در کمک به زبان آموزان جهت بازنویسی نوشته هایشان رابررسی کند ، و آیا اینکه رابطه ای بین نوع بازخورد مدرس و توانایی زبان آموزان در تصحیح غلط ها...

Inhibitory effect of glucagon on erythropoiesis.

The effect of glucagon on erythropoiesis has been studied in mice and rats. Long-acting glucagon protamine zinc (Novo) was injected subcutaneously twice daily at 9 a.m. and 4 p.m. After administration of 2 x 200 ag/day for 10 days, the erythropoiesis of male rats was markedly depressed. Total normoblasts counts per femur. reticulocytes. and “Fe uptake into red cells fell respectively to 35%, 50...