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  • pharmacokinetics  (123)
  • Immunocytochemistry  (42)
  • wheat
  • Springer  (196)
  • Elsevier
  • 1985-1989  (196)
  • 1987  (196)
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  • 1985-1989  (196)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The initial and residual agronomic effectiveness of some Indian, USA and Australian rock phosphates (1987)
    Springer
    Nutrient cycling in agroecosystems 12 (1987), S. 201-218 
    Details
    ISSN: 1573-0867
    Keywords: relative effectiveness ; apatites ; wheat ; initial and residual effectiveness ; bicarbonate extractable phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The initial and residual agronomic effectiveness of six apatite rock phosphates from India, one from the USA (North Carolina) and one from Australia (Queensland) were evaluated in a pot trial with wheat on a lateritic soil. All of the Indian rock phosphates were very poor sources of phosphorus. Values of initial effectiveness relative to monocalcium phosphate ranged from 〈 0.0001 to 0.02 and from 〈 0.0001 to 0.008 for measurements based on yield and phosphorus uptake respectively. The residual effectiveness relative to freshly applied monocalcium phosphate was determined by growing a second crop on the fertilized soils. The effectiveness of the Indian rock phosphates remained very low ranging from 〈 0.0001 to 0.002 and from 〈 0.0001 to 0.0004 for yield and phosphorus uptake respectively. Queensland and North Carolina rock phosphates were much superior to the Indian sources with initial effectiveness values in terms of yield of 0.08 and 0.37 and residual effectiveness values of 0.02 and 0.15 respectively. For each crop there was a single relationship between yield and phosphorus uptake (i.e. internal efficiency) for all phosphorus sources showing that variations in yield response were due solely to differences in phosphorus availability. Sodium bicarbonate extractable phosphorus values for fertilized soils sampled shortly after fertilization were not predictive of yield unless different calibration curves were used for the different phosphorus fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315105
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical assessment of the zinc status of some soils of the semi-arid region of India (1987)
    Springer
    Nutrient cycling in agroecosystems 13 (1987), S. 191-197 
    Details
    ISSN: 1573-0867
    Keywords: chemical extractants ; critical levels ; semi-arid region soils ; wheat ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To find critical tissue levels of Zn for wheat, and to evaluate various chemical extractants, a screen-house experiment was conducted on 21 diverse soils representing semi-arid regions in Haryana State, India. The extractants differed in the amounts of Zn extracted and the order was: 0.1 N HC1 〉 EDTA-NH4OAc 〉 EDTA-(NH4)2CO3 〉 DTPA + CaCl2. The amounts (mg kg−1) of extractable Zn associated with a yield reduction of 20% were: DTPA + CaCl2, 0.60; EDTA — (NH4)2CO3, 0.80; EDTA-NH4OAc, 0.92 and 0.1 N HCl, 1.20. The corresponding critical Zn concentration in ten weeks old plants was found to be 17 mg gm−1. The DTPA + CaCl2 method gave the best correlation (r = 0.85) between extracted Zn and Bray's per cent yield. It is recommended for assessing Zn status of soils of semi-arid region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066443
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics and absolute bioavailability of salbutamol in healthy adult volunteers (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 631-634 
    Details
    ISSN: 1432-1041
    Keywords: salbutamol ; albuterol ; pharmacokinetics ; bioavailability ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Salbutamol was administered to sixteen healthy male volunteers intravenously and by mouth in liquid, tablet, and capsule form using a Latin-Squares design. Pharmacokinetic parameters from intravenous data were similar to previously reported values obtained with oral administration, with a mean terminal half-life of 3.8 h and a mean clearance of 439 ml·min−1·1.73 m−2. Peak plasma concentrations of 10–20 ng·ml−1 were obtained 1–3 h following oral administration. The absolute bioavailability of each of the oral preparations was 44%. While statistically significant differences in lag time and time to peak concentration were noted among the various oral preparations, the drug is rapidly absorbed in all three dosage forms and the observed differences are unlikely to be of clinical significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456001
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear pharmacokinetic characteristics of 5-fluorouracil (5-FU) in colorectal cancer patients (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 411-418 
    Details
    ISSN: 1432-1041
    Keywords: 5-fluorouracil ; colorectal carcinoma ; pharmacokinetics ; product-inhibition ; blood clearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The nonlinear disposition kinetics of 5-fluorouracil (5-FU) were investigated in 6 patients with colorectal carcinoma. Each patient randomly received two single, intravenous doses of 5-FU (7.5 and 15 mg/kg) on separate days. Venous blood and urine samples were collected just prior to and for 5 h after drug administration. In addition to the kinetic studies, the in vitro whole blood/plasma concentration ratio and stability of 5-FU at 37°C were determined in whole blood from normal volunteers and from 5 patients with colorectal carcinoma. A disproportionate increase in area under the curve and corresponding decrease in total body clearance with increasing dose was observed suggesting dose-dependent behavior of 5-FU. Doubling the dose was accompanied by a 36% decrease in nonrenal clearance but no apparent change in renal clearance. Therefore, the mechanism for dose-dependent elimination appears to be primarily associated with nonrenal processes. The mean 5-FU half-life following the high dose was nearly twice as long as that observed for the low dose (12.3 versus 6.2 min). The log-linear decline in plasma concentrations and increase in half-life with dose suggest the potential role of product-inhibition as an explanation for the observed nonlinearity in 5-FU elimination. The present study demonstrates that 5-FU degrades when incubated in whole blood. This most likely reflects metabolism in red blood cells or other blood-formed elements since 5-FU was stable in plasma. Although degradation in whole blood occurs, the estimated whole blood clearance does not contribute significantly to the observed total body clearance value. These findings suggest the possibility of pulmonary clearance of 5-FU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543978
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative pharmacokinetics of theophylline following two fluoroquinolones co-administration (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 431-432 
    Details
    ISSN: 1432-1041
    Keywords: theophylline ; fluoroquinolones ; drug interaction ; pharmacokinetics ; ofloxacin ; norfloxacin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Pretreatment for 3 days with oral ofloxacin or norfloxacin had no significant effect on the disposition of a single i.v. dose the theophylline in healthy volunteers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543982
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  • 6
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of human growth hormone releasing factor (hGRF-44 NH2) in normal men after intravenous administration of a large range of doses (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 507-513 
    Details
    ISSN: 1432-1041
    Keywords: growth hormone releasing factor ; radio-immunoassay ; pharmacokinetics ; variance model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Three ranges of doses of growth hormone releasing factor (2.5–80 µg, 80–320 µg and 75–600 µg) were intravenously administered to healthy young volunteers in three double blind studies. Serum circulating GRF levels were determined by radioimmunoassay. Experimental concentration curves were fitted, using the extended least squares method, to a biexponential model for the structural model and power function for the variance model. The power variance model, compared to the constant variance model greatly reduced the coefficient of variation of the biexponential parameters. The power of the variance model was estimated to be 1.95. The distribution half-life was 6.6 min and the elimination half-life was 39.0 min (harmonic means). Total clearance was 0.12±0.01 µg/l/min. No difference between these parameters was found for the various doses. GRF kinetics was linear established in the range 10 to 600 µg which means that elimination was not altered by the increased doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637679
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  • 7
    Electronic Resource
    Electronic Resource
    Bioavailability and elimination of nitrendipine in liver disease (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 563-568 
    Details
    ISSN: 1432-1041
    Keywords: nitrendipine ; pharmacokinetics ; hepatitis ; liver cirrhosis ; protein binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Twenty one patients with liver disease (cirrhosis 11, chronic hepatitis 5 and acute hepatitis 5) and 6 healthy volunteers were given a single i.v. dose of nitrendipine 5 mg. Afterwords nitrendipine 20 mg once daily were administered orally for seven days. With the intravenous injection a significant increase in the AUC and elimination half-life of nitrendipine was found in patients with cirrhosis as compared to the normal volunteers. After chronic oral dosing, the area under the plasma concentration-time curve, AUC (0–24), was 94.5 ng ml−1 h and the plasma clearance CL was 1380.6 ml/min in the healthy controls; in patients with cirrhosis the AUC (0–24) h was significantly greater at 309.4 ng ml−1 h and CL had fallen to 686.6 ml/min. Considerable accumulation of nitrendipine was also found in the patients with chronic hepatitis. Nitrendipine could not be detected in urine from any of the subjects. Blood pressure and heart rate were not significantly influenced by the treatment in the various groups investigated. Antipyrine clearance in the patients with cirrhosis was correlated with the nitrendipine plasma clearance. Thus, accumulation of nitrendipine has been demonstrated in the patients with cirrhosis and chronic hepatitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455989
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  • 8
    Electronic Resource
    Electronic Resource
    Pharmacokinetics and pharmacodynamics of radio-labeled iloprost in elderly volunteers (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 597-605 
    Details
    ISSN: 1432-1041
    Keywords: iloprost ; prostacyclin analogue ; pharmacokinetics ; pharmacodynamics ; radiolabeled study ; volunteers ; side-effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The plasma levels and excretion of tritium-labeled iloprost in healthy elderly male and female volunteers have been measured after i.v. infusion of 2 ng·kg−1·min−1 for 4 h and oral administration of 0.1 and 0.48 μg/kg. During infusion, a steady-state of labeled compounds in the plasma was not achieved. Total radioactivity declined from a mean of 408 pg equiv/ml in three phases, with half-lives of 24 min, 1.7 h and 5.0 h, respectively. A steady-state of unchanged iloprost was reached rapidly with a peak of 81 pg/ml. Plasma levels declined biphasically with half-lives of 6 min and 31 min. Total clearance was 24 ml· min−1·kg−1. Maximum concentrations of labeled substances after oral administration were 307 and 1,051 pg equiv/ml after 29 and 39 min respectively. The peak of unchanged iloprost (116 pg/ml) was observed 7.5 min after an oral dose of 0.48 μg/kg. Bioavailability was 16%. Iloprost was totally metabolized and the metabolities were mainly excreted in urine. The main biotransformation products in plasma and urine were tentatively identified by cochromatography as dinor-and tetranoriloprost and their glucuronides. ADP-induced platelet aggregation was reduce by 60% during the i.v. infusion and 15 min after oral administration of 0.48 μg/kg. Heart rate and blood pressure were virtually unaffected. Common side-effects were facial flush, headache and nausea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455995
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  • 9
    Electronic Resource
    Electronic Resource
    Bioavailability of disopyramide in normal volunteers using unbound concentration (1987)
    Springer
    European journal of clinical pharmacology 32 (1987), S. 625-629 
    Details
    ISSN: 1432-1041
    Keywords: disopyramide ; bioavailability ; saturable binding ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of disopyramide were determined in 10 healthy volunteers after a 300 mg oral dose and again after a 2mg/kg i.v. dose. The unbound clearance was 599 ml/min and the unbound renal clearance 310 ml/min. The terminal elimination rate constant of unbound drug was 0.180 h−1 after the i.v. dose and 0.203 h−1 after the oral dose. The absorption rate constant was 0.53−1 and the maximum peak concentration occurred after 3.2 h. The bioavailability was 0.809 using the area under the unbound plasma concentration time curve. Although a saturable plasma protein binding was found in all subjects the bioavailability using the total concentration, in contrast to theoretical expectations, showed the same value (0.813) as the unbound concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456000
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of ceftazidime during plasmapheresis (1987)
    Springer
    European journal of clinical pharmacology 33 (1987), S. 197-201 
    Details
    ISSN: 1432-1041
    Keywords: ceftazidime ; renal impairment ; plasmapheresis ; pharmacokinetics ; cephalosporins ; autoimmune disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The influence of plasmapheresis (PA) on the elimination kinetics of ceftazidime (Cef) has been investigated. A single dose of Cef was administered intravenously to 11 patients with autoimmune diseases and varying degrees of renal impairment (Group I CLCR〈50 ml/min, Group II CLCR〉50 ml/min). In Groups I and II the mean total clearance of Cef (CL) was 30 and 116 ml/min−1, respectively. The elimination half-life (t1\2β) and the volume of distribution (V) were significantly higher in Group I than in Group II (11.9 vs 2.0 h, 27.1 vs 18.5 l). PA had no influence on the plasma level-time profile of Cef. The amount of Cef recovered from separated plasma accounted for only 2 to 9% of the administered dose, being particularly low in patients with normal renal function (4.6%). Thus, since elimination of Cef via PA is negligible, dosage calculations should be based solely on renal function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544567
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