"Logic for Philosophers," by Richard L. Purtill

Wilson, Barrie A.

doi:10.5840/schoolman197351170

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The kinetic aspects of the reaction are currently being studied in our laboratory. The facts that colchicine binds to free tubulin better than to microtubules (Table 2) and did not depolymerize the tubules seems to support the view that the in vivo action of the antimitotic agent is to bind to tubulin and thereby prevent microtubule formation (Borisy and Taylor, 1967;Wilson and Meza, 1973). On the other hand, although the colchicine found in the pellet after centrifugation at 100,000 X g might be due to the presence of tubulin which sedimented, it could also be due to colchicine bound to intact tubules.…”

Section: Discussionmentioning

confidence: 61%

The in vitro polymerization of tubulin from beef brain

et al. 1974

View full text Add to dashboard Cite

SUMMARYThe conditions for the in uitro polymerization of beef brain tubulin have been examined using turbidity and electron microscopic examination as methods of following the reaction. The optimal conditions are 37"C, pH 6.0-6.4, and an ionic strength of approximately 0.08 t o 0.1 p . The ionic strength is particularly critical, a t 0.25 p the polymerization does not occur and increasing the ionic strength of a solution containing microtubules to this value causes the tubules to depolymerize. GTP and Mg2+ are required. After an initial lag period the rate of polymerization appears to follow first-order kinetics. Although colchicine inhibits the polymerization reaction it does not cause the tubules formed in vitro to depolymerize. Binding studies show that colchicine binds t o free tubulin better than to tubules. Calcium also inhibits polymerization and causes the depolymerization of tubules.

show abstract

Section: Discussionmentioning

confidence: 61%

The in vitro polymerization of tubulin from beef brain

et al. 1974

View full text Add to dashboard Cite

show abstract

“…A number of authors have proposed relationships that predict suspended sediment yield as a function of precipitation, under a variety of climates, namely: semiarid or arid (Fournier, 1949;Langbein and Schumn, 1958); subhumid (Rango, 1970;Wilson, 1973); tropical (Fournier, 1949;Wilson, 1973).…”

Section: Sediment Yield As a Function Of Precipitationmentioning

confidence: 99%

SOME SUSPENDED SEDIMENT YIELDS FROM SOUTH ISLAND CATCHMENTS, NEW ZEALAND¹

Griffiths¹

1981

J American Water Resour Assoc

View full text Add to dashboard Cite

Estimates of specific annual suspended sediment yields, some of which rank among the highest reported in the world, are presented for 33 basins of South Island, New Zealand. Yield from each basin was determined by combining a suspended sediment concentration rating with the complete flow record of each catchment stream gaging station A multiple regression analysis between sediment yields and climatic, hydrologic and physiographic parameters of each basin demonstrates that most of the variance in yields is explained by catchment mean rainfall. Geology apparently has little influence on sediment yield as suspended sediment concentration ratings, from rivers draining catchments of differing lithology, and regolith, are indistinguishable. Specific suspended sediment yield prediction equations are given for four defined regions covering in area almost all South Island; and except for one area, feature rainfall as the principle independent variablc. Differences between regjons may be due to variations in intensity, frequency, and duration patterns of storms. It is proposed that a simple power law relationship between yield and rainfall provides useful suspended sediment yield estimates in mountainous regions of temperate maritime climate, provided catchments have not been modified extensively by man.

show abstract

"Logic for Philosophers," by Richard L. Purtill

Cited by 2 publications

References 0 publications

The in vitro polymerization of tubulin from beef brain

The in vitro polymerization of tubulin from beef brain

SOME SUSPENDED SEDIMENT YIELDS FROM SOUTH ISLAND CATCHMENTS, NEW ZEALAND¹

Contact Info

Product

Resources

About

"Logic for Philosophers," by Richard L. Purtill

Cited by 2 publications

References 0 publications

The in vitro polymerization of tubulin from beef brain

The in vitro polymerization of tubulin from beef brain

SOME SUSPENDED SEDIMENT YIELDS FROM SOUTH ISLAND CATCHMENTS, NEW ZEALAND1

Contact Info

Product

Resources

About

SOME SUSPENDED SEDIMENT YIELDS FROM SOUTH ISLAND CATCHMENTS, NEW ZEALAND¹