An ultramicro-scale method for the determination of the uranyl cation

The Analyst ◽  
1973 ◽  
Vol 98 (1168) ◽  
pp. 525 ◽  
Author(s):  
Glenn Peter Wood
Keyword(s):  
2019 ◽  
Vol 186 (5) ◽  
Author(s):  
Leila Farzin ◽  
Mojtaba Shamsipur ◽  
Shahab Sheibani ◽  
Leila Samandari ◽  
Zahra Hatami
Keyword(s):  

1979 ◽  
Vol 25 (7) ◽  
pp. 1300-1302 ◽  
Author(s):  
S H Petersdorf ◽  
V A Raisys ◽  
K E Opheim

Abstract We describe the use of "high-performance" liquid chromatography to measure chloramphenicol in as little as 25 microL of serum. Serum is treated to precipitate proteins with acetonitrile containing p-nitroacetanilide as an internal standard. Chloramphenicol is eluted with a mobile phase of methanol in pH 7.0 phosphate buffer (35/65 by vol). The drug is measured at 278 nm and simultaneously monitored at 254 nm; interfering substances are detected by examining the 278 nm/254 absorbance ratios. This method is sensitive to less than 0.5 mg/L and the standard curve is linear to at least 50 mg/L. Inter-day precision ranged between 3--6%. We encountered no interference from endogenous compounds or from other drugs we tested.


1973 ◽  
Vol 30 (5) ◽  
pp. 607-616 ◽  
Author(s):  
Richard J. Beamish

The use of the scale method to determine age of mature white suckers should be avoided. Sections of pectoral fin rays can provide accurate age determinations for most populations once the position of the first annulus has been identified. The age of immature white suckers can be estimated by both methods. It is suggested that, for identification of the first fin ray annulus and facility in the determination of the age of immature white suckers, both pectoral fins and scales should be sampled in all age and growth studies of this species.White suckers (Catostomus commersoni) from populations examined in this study attained ages of up to 17 years although little or no growth occurred in the latter years. Considerable variation in size at sexual maturity was found throughout the range for this species and, thus, the validity of a subspecies designation for a dwarf white sucker (C. c. utawana) based primarily on size differences should be reexamined.


1996 ◽  
Vol 354 (4) ◽  
pp. 474-476
Author(s):  
L. Polese ◽  
E. V. Minelli ◽  
E. F. G. Jardim ◽  
M. L. Ribeiro

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