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  • 1
    Electronic Resource
    Electronic Resource
    The Acidic Solvolytic Transformations of an Iodinated Nucleoside, the Antivitral 5-Iodo-2'-deoxyuridine1 (1964)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 4460-4468 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01074a044
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial Mapping of Conductive Ground Water Contamination With Electromagnetic Induction (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 4 (1984), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.1984.tb00896.x
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  • 3
    Electronic Resource
    Electronic Resource
    Volume fraction analysis of human coronal dentin (1969)
    Springer
    Calcified tissue international 4 (1969), S. 257-259 
    Details
    ISSN: 1432-0827
    Keywords: Teeth ; Dentin ; Tubules ; Sclerosis ; Microradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Une méthode systématique de comptage par points a été utilisée pour déterminer le volume respectif de la dentine humaine coronaire péricanaliculaire et intercanaliculaire. Contrairement à l'opinion classique, il apparait que la dentine péricanaliculaire constitute une partie relativement importante de la dentine humaine coronaire, surtout au niveau de la moitié interne de la dentine. Dans cette couche, les proportions relatives des deux constitutants sont sensiblement égales.
    Abstract: Zusammenfassung Einc systematische Punktzählmethode wurde angewendet, um die Fraktionen der peritubulären Matrix im menschlichen Dentin der Zahnkrone volumetrisch auszuwerten. Entgegen der früheren Annahme zeigte es sich, daß das peritubuläre Dentin eine relativ große Fraktion des Dentins der Zahnkrone ausmacht; dies war besonders in der inneren Hälfte vom Dentin der Fall, wo die relativen Volumen der beiden Matrices ungefähr gleich groß waren.
    Notes: Abstract A systematic point-count method was utilized to determine the volume fractions of peritubular and intertubular matrix in human coronal dentin. Contrary to previous thought, it was found that peritubular dentin represents a relatively large fraction of human coronal dentin, particularly in the inner one-half of the dentin, where the relative volumes of the two matrices were approximately equal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279128
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  • 4
    Electronic Resource
    Electronic Resource
    Optical and radiographic appearance of thin ground sections of dentin (1967)
    Springer
    Calcified tissue international 1 (1967), S. 319-323 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des microradiographies de coupes minces minéralogiques de canalicules dentinaires, en coupe transversale, sont comparées a vec les aspects de ces mêmes canalicules en microscopie optique. Les anneaux clairs, visibles autour des canalicules en microscopie à lumière transparentc, en effectuant la mise au point sur la partie supérieure de la coupe, ne peuvent être mis en parallèle avec la zone péricanaliculaire — ces anneaux sont visibles dans la dentine d'incisive de rat, qui ne contient pas de matrice péricanaliculaire. Il semble donc que des coupes par usure, observée en lumière transparente classique, ne permettent pas d'identifier la zone péricanaliculaire.
    Abstract: Zusammenfassung Röntgenmikrographien von quergetroffenen Zahnbeinkanälchen in Schliffschnitten wurden mit gewöhnlichen lichtmikroskopischen Bildern verglichen. Die hellen Ringe, welche im gewöhnlichen lichtmikroskopischen Bild erscheinen, wenn das Mikroskop über die obere Schnittfläche eingestellt wird, konnten nicht mit einer röntgenmikrographisch dargestellten peritubulären Zone verglichen werden. Diese Ringe konnten im Zahnbein von Rattenschneidezähnen, die keine peritubuläre Zone besitzen, dargestellt werden. Es wurde festgestellt, daß die im gewöhnlichen Licht beobachteten Schliffschnitte nicht für die Herstellung der peritubulären Zonen geeignet sind.
    Notes: Abstract Microradiograms of thin ground sections of transversely cut dentinal tubules were compared to the light microscopic images of the ground sections. The bright rings seen around tubules viewed by ordinary transmitted light with the objective focused on the upper surface of the section could not be related to a radiographically demonstrable peritobular zone. These rings could be produced in rat incisor dentin which does not have peritubular matrix. It was concluded that ground sections viewed with ordinarily transmitted light could not be validly used to determine the presence of peritubular matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02008103
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  • 5
    Electronic Resource
    Electronic Resource
    Apparently hypermineralized perilacunar bone an artefact in microradiographs (1968)
    Springer
    Calcified tissue international 2 (1968), S. 177-182 
    Details
    ISSN: 1432-0827
    Keywords: Microradiography ; Bone ; Dentin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les couches de matrice osseuse entourant les lacunes des osteocytes qui sont apparemment hypermineralisees (radioopaques), peuvent etre eliminees des microradiographies au moyen d'une agitation continue au cours de developpement. Il en va de meme des bordures radioopaques situees le long des felures artificielles dans les coupes. Les structures reellement hypermineralisees, telles que la dentine peritubulaire, les lignes cementantes es les bords internes des osteones ne sont pas modifiees par le traitement.
    Abstract: Zusammenfassung Das Auftreten einer hypermineralisiert erscheinenden Schicht von Knochengewebe um die Knochenhoehlchen, aber auch dasjenige von dichter erscheinenden Rändern an künstlich erzeugten Spalten in den Gewebsschnitten, konnte verhindert werden durch stetiges Agitieren während der Entwicklung der Historadiogramme. Dagegen hatte die gleiche Behandlung keinen Einfluß auf das Sichtbarbleiben anderer, wirklich hypermineralisierter Gebilde, z. B. der Ränder der Zahnbeinkanälchen, Knochenkittlinien, und Binnensäume von Osteonen.
    Notes: Abstract Apparently hypermineralized (radiopaque) layers of bone matrix surrounding osteocyte lacunae, as well as radiopaque edges along artificial cracks in the sections, could be eliminated from microradiographs by continuous agitation during development. Other hypermineralized structures, such as peritubular dentin, cementing lines and the inner edges of osteons, persisted and were not artefacts of development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279206
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  • 6
    Electronic Resource
    Electronic Resource
    Peritubular matrix: A correlated radiographic and staining study (1971)
    Springer
    Calcified tissue international 8 (1971), S. 17-23 
    Details
    ISSN: 1432-0827
    Keywords: Dentin ; Matrix ; Microradiography ; Staining ; Decalcification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Un certain nombre de méthodes ont été décrites pour colorer de façon différente la matrice péricanaliculaire sur des coupes par usure de dentine humaine. Ces méthodes opèrent toutes à des pH qui sont susceptibles de décalcifier cette matrice. Des microradiographies de coupes par usure ont été réalisées avant et après coloration ou précoloration, ayant permis d'identifier la matrice péricanaliculaire. Les radiographies ont montré que cette matice est décalcifiée avant et à la fin du traitement. De telles techniques de coloration doivent être remplacées par des méthodes plus adaptées.
    Abstract: Zusammenfassung Verschiedene Forscher haben eine Anzahl von Methoden mitgeteilt, um die peritubuläre Matrix unentkalkter Schliffe von menschlichem Dentin differenziert zu färben. Allerdings wurden sämtliche dieser Methoden bei pH-Werten ausgeführt, die so hoch sind, daß die Möglichkeit besteht, die sehr säurelösliche peritubuläre Matrix zu entkalken. Von Schliffen wurden Mikroradiographien hergestellt, und zwar vor und nach den verschiedenen Färbeprozessen, welche nachgewiesenermaßen erfolgreich zum Färben von peritubulärer Matrix angewandt worden sind. Die Radiographien zeigten, daß die peritubuläre Matrix entweder am Schluß der vorgeschriebenen Behandlung oder sogar schon längst vorher entkalkt war. Es wurde daraus geschlossen, daß diese Färbetechniken durch neuere Methoden ersetzt werden sollten.
    Notes: Abstract Previous investigators have reported a number of methods which will differentially stain peritubular matrix in undecalcified ground sections of human dentin. The methods, however, were all carried out at pH values which were potentially high enough to decalcify the highly acid-soluble peritubular matrix. Microradiograms were prepared of ground sections both before and after they had been exposed to either the staining or pre-staining treatments which reportedly had been successful for staining peritubular matrix. The radiograms revealed that the peritubular matrix was decalcified either at the end of, or long before, the prescribed treatment had been completed. It was concluded that the use of these staining techniques should be re-evaluated by more recent methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010119
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  • 7
    Electronic Resource
    Electronic Resource
    Monitoring well placement using conditional simulation of hydraulic head (1991)
    Springer
    Mathematical geology 23 (1991), S. 1059-1080 
    Details
    ISSN: 1573-8868
    Keywords: conditional simulation ; contaminant migration ; geostatistics ; plume interception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract A theoretical technique for conditioning simulations in frequency domain is developed and then applied to a hydraulic-head data set from Pittman, Nevada. Frequency-domain simulation rapidly generates simulations while requiring minimal computer memory. This makes it possible by using a personal computer to create large numbers of simulations of a physical parameter field for use in studying stochastic processes. In our application, groundwater flowlines are constructed from the simulations of the hydraulic head field. Then, the crossings of the flowlines at a transect down-stream from a contaminant point source generate histograms for predicting the probability of plume interception by groundwater monitoring wells. The simulation process is discussed in detail for the Pittman study site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066111
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluation and comparison of spatial interpolators (1992)
    Springer
    Mathematical geology 24 (1992), S. 381-391 
    Details
    ISSN: 1573-8868
    Keywords: sampling ; geostatistics ; estimators ; interpolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract This study evaluates 15 different estimators to determine their relative merits in estimating block concentrations at contaminant waste sites. The evaluation was based on 54 subsets of data drawn from an exhaustive set of 19,800 data. For each subset, 198 block estimates were made with each estimator. The measurements of estimation quality were a linear loss function and a more standard statistic, the mean square error. The linear loss function showed that seven of the estimators produced scores close enough to be within the same statistical population. Results based on the mean square error were similar. The surprising results of this study were that inverse distance and inverse distance squared both produced better scores than kriging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00891270
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  • 9
    Electronic Resource
    Electronic Resource
    Probability of plume interception using conditional simulation of hydraulic head and inverse modeling (1991)
    Springer
    Mathematical geology 23 (1991), S. 219-239 
    Details
    ISSN: 1573-8868
    Keywords: parameter estimation ; simulation ; groundwater contamination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract A procedure to estimate the probability of intercepting a contaminant groundwater plume for monitoring network design has been developed and demonstrated. The objective of the procedure is to use all available information in a method that accounts for the heterogeneity of the aquifer and the paucity of data. The major components of the procedure are geostatistical conditional simulation and parameter estimation that are used sequentially to generate flow paths from a suspected contaminant source location to a designated monitoring transect. From the flow paths, a histogram is constructed that represents the spatial probability distribution of plume centerlines. With an independent estimate of the plume width, a relationship between the total cost and the probability of detecting a plume can be made. The method uses geostatistical information from hydraulic head measurements and is conditioned by the data and the physics of groundwater flow. This procedure was developed specifically for the design of monitoring systems at sites where very few, if any, hydraulic conductivity data are available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066296
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation and comparison of spatial interpolators II (1994)
    Springer
    Mathematical geology 26 (1994), S. 589-603 
    Details
    ISSN: 1573-8868
    Keywords: kriging ; geostatistics ; spatial estimation ; inverse-distance estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The performance of several variations on ordinary kriging and inverse distance estimators is evaluated. Mean squared errors (MSE) were calculated for estimates made on multiple resamplings from five exhaustive data bases representing two distinctly different types of estimation problem. Ordinary kriging, when performed with variograms estimated from the sample data, was more robust than inverse-distance methods to the type of estimation problem, and to the choice of estimation parameters such as number of neighbors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02089243
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