A New Method of Determining Small Osmotic Pressures. I. Principle and Apparatus.

Claesson, Stig; Jacobsson, Gunnar; Lang, W.; Berndt, W.

doi:10.3891/acta.chem.scand.08-1835

Cited by 7 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike tropic agents, however, prostaglandins are endogenous in the target tissue, as are the long chain fatty acid precursors required for prostaglandin synthesis (23). We have shown that the bovine ovary contains prostaglandins of the PGE and PGF series (unpublished data), and the fact that agents of such potency are endogenous to the tissue suggests that prostaglandins have a role in ovarian physiology.…”

Section: Discussionmentioning

confidence: 93%

Prostaglandin Stimulation ofin VitroProgesterone Synthesis

Speroff¹,

Ramwell²

1970

The Journal of Clinical Endocrinology & Metabolism

179

View full text Add to dashboard Cite

Bovine corpora lutea slices were incubated with prostaglandins and gonadotropins. All the prostaglandins tested (PGE 2 , PGE X , PGFjo and PGAi) were found to be steroidogenic, stimulating both the production of progesterone as measured in micrograms and the incorporation of radioactivity from acetate-l-u C. Prostaglandin E2 (PGE 2 ) gave the greatest effect, being approximately half as effective as luteinizing hormone (LH) on a molar basis. There were similarities between gonadotropin and prostaglandin. Cycloheximide (1 HIM) equally blocked the steroidogenic response to both PGE 2 and LH, the specific activities of the progesterone formed in the presence of prostaglandins and that formed in the presence of gonadotropins were approximately of the same order of magnitude, the time-response curves of PGE 2 and LH were similar, and there was no additive effect when prostaglandins were added to luteal slices incubated with saturating doses of either LH or human chorionic gonadotropin (HCG). These results are in contrast to the in vivo luteolytic effect of PGF 2 Q , and it is unlikely, therefore, that the luteolytic effect of PGF 2a is due to a direct inhibition of luteal steroidogenesis. Thus, the in vitro and in vivo effects of prostaglandins may represent 2 different mechanisms of action. (J Clin Endocr 30: 345, 1970)

show abstract

Section: Discussionmentioning

confidence: 93%

Prostaglandin Stimulation ofin VitroProgesterone Synthesis

Speroff¹,

Ramwell²

1970

The Journal of Clinical Endocrinology & Metabolism

179

View full text Add to dashboard Cite

show abstract

A simple device for locating liquid menisci with applications to viscometry and osmomentry

Claesson

Lohmander

1956

Makromol. Chem.

View full text Add to dashboard Cite

A simple optical arrangement is described with which one can easily determine the position of a liquid meniscus with good accuracy (1-2 y) by observing an diffraction fringe. This arrangement is convenient for the measurement of osmotic pressure or viscosity. Some experiments are described where it is used to measure viscosities a t very low gradients (low driving pressures) in a capillary viscometer. ZUSAMMENFASSUNG:Es wird eine einfache optische Anordnung beschrieben, mittels deren man leicht und mit guter Genauigkeit ( 1-2y) die Lage eines Fliiesigkeitsmeniscus feststellen kann, indem man eine Beugungsfianse mikroskopisch beobachtet. Diese Anordnung eignet sich f~ die Messung von osmotischem Druck oder Viskositit. Hier werden einige Messungen mitgeteilt, bei denen das Verfahren zur Bestimmung der Viskositiit in Kapillarviskosimetem bei sehr schwachen Gradienten (niedrigen treibenden Drucken) zur Anwendung

show abstract

Über die experimentelle und rechnerische ermittlung osmotischer drucke aus der einstellgeschwindigkeit

Elias

1957

Makromol. Chem.

View full text Add to dashboard Cite

Mit 1 Abbildung (Eingegangen am 6. Februar 1957) ZUSAMMENFASSUNG:Es wird eine Methode angegeben, die es gestattet, aus der experimentell ermittelten Einstellgeschwindigkeit osmotischer Drucke den Wert fiir den osmotischen Druck im Gleichgewicht zu berechnen. Vergleichsmessungen mit der statischen Methode ergaben, daB sich aus der Einstellgeschwindigkeit die Steighohen auf + 5 .[cm], bezogen auf die statischen Werte, reproduzieren lassen. SUMMARY:A method is described to calculate the osmotic pressure in equilibrium from the changing speed of the menisci in osmometric capillaries. By comparing the results of this method with those of the static method, a reproducibility of k 5.10-s [cm] will be demonstrated.

show abstract

A New Method of Determining Small Osmotic Pressures. I. Principle and Apparatus.

Cited by 7 publications

References 0 publications

Prostaglandin Stimulation ofin VitroProgesterone Synthesis

Prostaglandin Stimulation ofin VitroProgesterone Synthesis

A simple device for locating liquid menisci with applications to viscometry and osmomentry

Über die experimentelle und rechnerische ermittlung osmotischer drucke aus der einstellgeschwindigkeit

Contact Info

Product

Resources

About