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  • Articles  (14,408)
  • Springer  (13,800)
  • Taylor & Francis  (608)
  • 2000-2004  (2,553)
  • 1985-1989  (6,488)
  • 1980-1984  (5,367)
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  • Articles  (14,408)
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  • 1
    Electronic Resource
    Electronic Resource
    Abstracts of papers pharmacological meeting (1986)
    Springer
    Pharmacy world & science 8 (1986), S. 270-278 
    Details
    ISSN: 1573-739X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960072
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  • 2
    Electronic Resource
    Electronic Resource
    Comparisons of creatine kinase primary structures (1986)
    Springer
    The protein journal 5 (1986), S. 1-14 
    Details
    ISSN: 1573-4943
    Keywords: creatine kinase primary structure comparisons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Comparisons of nine creatine kinase sequences show that 67% of the protein sequence is identical among rabbit, rat, mouse, and chicken muscle, rabbit, rat, and chicken brain, and electric organ sequences from two species of electric ray(Torpedo). The extensive homology precludes a facile prediction of active-site residues based on sequence conservation. The sequences are more similar within isozyme types than are the different isozymes from any one species. There are 35 positions in the muscle and brain sequence pairs for three species which differentiate the two forms. TheTorpedo sequences do not fall completely into either of these patterns. Except for homology with partial sequences of other ATP-guanidino phosphotransferases, no significant homology with other protein or nucleic acid sequences in available databases was found. Preliminary secondary structural predictions suggest that the C-terminal half of the protein is likely an α/β-type protein. Placement in the sequence of two peptides found in previous cross-linking studies reveals two stretches of primary structure that are presumably close in space to the reactive Cys-283 and hence close to the active site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025580
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  • 3
    Electronic Resource
    Electronic Resource
    A study of ozone in the Colorado mountains (1983)
    Springer
    Journal of atmospheric chemistry 1 (1983), S. 87-105 
    Details
    ISSN: 1573-0662
    Keywords: Tropospheric ozone ; ozone precursors ; photochemistry ; nitrogen oxides ; rural ozone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The seasonal and diurnal variations of ozone mixing ratios have been observed at Niwot Ridge. Colorado. The ozone mixing ratios have been correlated with the NO x (NO+NO2) mixing ratios measured concurrently at the site. The seasonal and diurnal variations in O3 can be reasonably well understood by considering photochemistry and transport. In the winter there is no apparent systematic diurnal variation in the O3 mixing ratio because there is little diurnal change of transport and a slow photochemistry. In the summer, the O3 levels at the site are suppressed at night due to the presence of a nocturnal inversion layer that isolated ozone near the surface, where it is destroyed. Ozone is observed to increase in the summer during the day. The increases in ozone correlate with increasing NO x levels, as well as with the levels of other compounds of anthropogenic origin. We interpret this correlation as in-situ or in-transit photochemical production of ozone from these precursors that are transported to our site. The levels of ozone recorded approach 100 ppbv at NO x mixing ratios of approximately 3 ppbv. Calculations made using a simple clean tropospheric chemical model are consistent with the NO x -related trend observed for the daytime ozone mixing ratio. However, the chemistry, which does not include nonmethane hydrocarbon photochemistry, underestimates the observed O3 production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00113981
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  • 4
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of zimelidine (1980)
    Springer
    European journal of clinical pharmacology 17 (1980), S. 111-116 
    Details
    ISSN: 1432-1041
    Keywords: zimelidine ; norzimelidine ; antidepressants ; pharmacokinetics ; bioavailability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The systemic availability of a new antidepressant, zimelidine, and of its pharmacologically active metabolite, norzimelidine, was studied in six healthy male volunteers. Three single doses of zimelidine (25 mg and 100 mg orally and 25 mg i.v.) and two single doses of norzimelidine (25 mg orally and i. v.) were given to each volunteer allowing at least seven days between administrations. Plasma concentrations of zimelidine and norzimelidine were determined in serial blood samples by HPLC. Following oral zimelidine peak plasma concentrations of the metabolite were attained about 3 h after dosing. Oral administration of norzimelidine itself resulted in a plasma concentration profile for this compound that was similar to that observed after oral zimelidine. Utilising the plasma concentration data following intravenous infusion of each compound, the elimination half-lives for zimelidine and norzimelidine were calculated to be 5.1 h (range 4.3–6.0) and 15.5 h (range 10.6–22.9) respectively. The total body clearances of the 2 compounds were similar at 0.52 l · min−1 (range 0.26–0.70) for zimelidine and 0.56 l · min−1 (range 0.28–0.83) for norzimelidine. The substantially longer elimination half-life of norzimelidine was apparently the result of a larger volume of distribution (9.4 l · kg−1; range 7.8–11.4) for this metabolite, as compared to zimelidine (3.21 · kg−1; range 1.6–4.9). The calculated bioavailability of zimelidine was 26% (range 9.1–39) after the 25 mg oral dose, and 29% (range 14–46) after the 100 mg dose. The bioavailability of norzimelidine was 66% (range 36–91). However, oral administration of zimelidine resulted in as much or more norzimelidine reaching the systemic circulation, as the oral administration of norzimelidine itself. This is important as a large part of the activity of the drug may be due to the metabolite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562618
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  • 5
    Electronic Resource
    Electronic Resource
    Abstracts of papers (1982)
    Springer
    Pharmacy world & science 4 (1982), S. 205-212 
    Details
    ISSN: 1573-739X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959141
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  • 6
    Electronic Resource
    Electronic Resource
    Abstracts of papers pharmacological meeting (1987)
    Springer
    Pharmacy world & science 9 (1987), S. 291-301 
    Details
    ISSN: 1573-739X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953632
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  • 7
    Electronic Resource
    Electronic Resource
    Paleolimnological evidence for recent acidification of Big Moose Lake, Adirondack Mountains, N.Y. (USA) (1987)
    Springer
    Biogeochemistry 3 (1987), S. 267-296 
    Details
    ISSN: 1573-515X
    Keywords: Adirondacks ; lake acidification ; acid precipitation ; paleolimnology ; diatoms ; chrysophytes ; chironomids ; geochemistry ; sulfur ; PAH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Big Moose L. has become significantly more acidic since the 1950s, based on paleolimnological analyses of sediment cores. Reconstruction of past lakewater pH using diatom assemblage data indicates that from prior to 1800 to ca. 1950, lakewater pH was about 5.8. After the mid-1950s, the inferred pH decreased steadily and relatively quickly to about 4.6. Alkalinity reconstructions indicate a decrease of about 30 μeq · l-1 during the same period. There was a major shift in diatom assemblage composition, including a nearly total loss of euplanktonic taxa. Chrysophyte scale assemblages and chironomid (midge larvae remains also changed in a pattern indicating decreasing lakewater pH starting in the 1950s. Accumulation rates of total Ca, exchangeable and oxide Al, and other metals suggest recent lake-watershed acidification. Cores were dated using210Pb, pollen, and charcoal. Indicators of watershed change (deposition rates of Ti, Si, Al) do not suggest any major erosional events resulting from fires or logging. Accumulation rates of materials associated with combustion of fossil fuels (polycyclic aromatic hydrocarbons, coal and oil soot particles, some trace metals, and sulfur) are low until the late 1800s-early 1900s and increase relatively rapidly until the 1920s–1930s. Peak rates occurred between the late 1940s and about 1970, when rates declined. The recent decrease in pH of Big Moose L. cannot be accounted for by natural acidification or processes associated with watershed disturbance. The magnitude, rate and timing of the recent pH and alkalinity decreases, and their relationship to indicators of coal and oil combustion, indicate that the most reasonable explanation for the recent acidification is increased atmospheric deposition of strong acids derived from combustion of fossil fuels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185196
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  • 8
    Electronic Resource
    Electronic Resource
    A material isolated from human hands that attracts female mosquitoes (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 429-438 
    Details
    ISSN: 1573-1561
    Keywords: Attractants ; human ; mosquito ; collection ; concentration ; Aedes aegypti ; Anopheles quadrimaculatus ; Diptera ; Culicidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The residue left on glass surfaces by human hands was found to be attractive to femaleAedes aegypti (L.) andAnopheles quadrimaculatus Say mosquitoes. The material lost half of its activity in 1 hr. A solvent wash technique was developed to recover and concentrate the residuum from handled glass beads. The residuum could be recovered effectively with absolute ethanol and less effectively with several other solvents. More mosquitoes were attracted to heated than to unheated residuum, an indication of its volatility. Also, attraction of the residuum decreased with decreasing concentration or dose. Concentrated residuum collections, stored under refrigeration and tested for longevity, showed no appreciable loss of attractiveness up to 60 days of storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987791
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  • 9
    Electronic Resource
    Electronic Resource
    Background ozone and anthropogenic ozone enhancement at niwot ridge, Colorado (1986)
    Springer
    Journal of atmospheric chemistry 4 (1986), S. 63-80 
    Details
    ISSN: 1573-0662
    Keywords: Tropospheric ozone ; photochemistry ; nitrogen oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The mixing ratios for ozone and NOx (NO+NO2) have been measured at a rural site in the United States. From the seasonal and diurnal trends in the ozone mixing ratio over a wide range of NOx levels, we have drawn certain conclusions concerning the ozone level expected at this site in the absence of local photochemical production of ozone associated with NOx from anthropogenic sources. In the summer (June 1 to September 1), the daily photochemical production of ozone is found to increase in a linear fashion with increasing NOx mixing ratio. For NOx mixing ratios less than 1 part per billion by volume (ppbv), the daily increase is found to be (17±3) [NOx]. In contrast, the winter data (December 1 to March 1) indicate no significant increase in the afternoon ozone level, suggesting that the photochemical production of ozone during the day in winter approximately balances the chemical titration of ozone by NO and other pollutants in the air. The extrapolated intercept corresponding to [NOx]=0 taken from the summer afternoon data is 13% less than that observed from the summer morning data, suggesting a daytime removal mechanism for O3 in summer that is attributed to the effects of both chemistry and surface deposition. No significant difference is observed in the intercepts inferred from the morning and afternoon data taken during the winter. The results contained herein are used to deduce the background ozone level at the measurement site as a function of season. This background is equated with the natural ozone background during winter. However, the summer data suggest that the background ozone level at our site is elevated relative to expected natural ozone levels during the summer even at low NOx levels. Finally, the monthly daytime ozone mixing ratios are reported for 0≤[NOx]≤0.2 ppbv, 0.3 ppbv≤[NOx]≤0.7 ppbv and 1 ppbv≤[NOx]. These monthly ozone averages reflect the seasonal ozone dependence on the NOx level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053773
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  • 10
    Electronic Resource
    Electronic Resource
    A Study of DMS Oxidation in the Tropics: Comparison of Christmas Island Field Observations of DMS, SO2, and DMSO with Model Simulations (2000)
    Springer
    Journal of atmospheric chemistry 37 (2000), S. 137-160 
    Details
    ISSN: 1573-0662
    Keywords: dimethyl sulfide ; sulfur dioxide ; DMS oxidation ; SO2 ; wet/dry deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract This study reports comparisonsbetween model simulations, based on current sulfurmechanisms, with the DMS, SO2 and DMSOobservational data reported by Bandy et al.(1996) in their 1994 Christmas Island field study. For both DMS and SO2, the model results werefound to be in excellent agreement with theobservations when the observations were filtered so asto establish a common meteorological environment. Thisfiltered DMS and SO2 data encompassedapproximately half of the total sampled days. Basedon these composite profiles, it was shown thatoxidation of DMS via OH was the dominant pathway withno more than 5 to 15% proceeding through Cl atoms andless than 3% through NO3. This analysis wasbased on an estimated DMS sea-to-air flux of 3.4 ×109 molecs cm-2 s-1. The dominant sourceof BL SO2 was oxidation of DMS, the overallconversion efficiency being evaluated at 0.65 ± 0.15. The major loss of SO2 was deposition to theocean's surface and scavenging by aerosol. Theresulting combined first order k value was estimated at 1.6 × 10-5 s-1. In contrast to the DMSand SO2 simulations, the model under-predictedthe observed DMSO levels by nearly a factor of 50. Although DMSO instrument measurement problems can notbe totally ruled out, the possibility of DMSO sourcesother than gas phase oxidation of DMS must beseriously considered and should be explored in futurestudies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006429932403
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