Purpose The purpose of this study was to test the Hanau Modular Articulator system with programmed fossae to determine its interchangeability.Materials and Methods Eight Hanau Modular Articulators were tested using the same measuring system as previously developed in a similar investigation on a different instrument.Results It was determined that the Hanau Modular System with programmed fossae did possess accuracy when a measuring device was transferred between the eight articulators tested.Conclusions Laboratory procedures for multiple restorations can be accomplished with accuracy when master casts and mountings are transferred between Hanau Modular Articulators.

The in vitro physical properties of two types of polydimethyl siloxane, MDX 4-4210 and a new material A-2186, were compared. The properties that were investigated in this study were tensile strength, elongation, tear strength, and surface hardness. The properties tested were selected because of their clinical significance for fabricating a facial prosthesis. According to the results obtained in this investigation, the new material, A-2186, had greater tear resistance, tensile strength, and a larger percentage of elongation. A-2186 material, also proved to be softer at the surface than the MDX 4-4210. This combination of physical properties makes this material, A-2186, a better choice than the traditional MDX 4-4210 for the fabrication of facial prostheses.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2'-Anhydropyrimidine nucleosides. Novel syntheses and reactionsDavid H. Shannahoff and Robert A. SanchezCite this: J. Org. Chem. 1973, 38, 3, 593–598Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://pubs.acs.org/doi/10.1021/jo00943a040https://doi.org/10.1021/jo00943a040research-articleACS PublicationsRequest reuse permissionsArticle Views694Altmetric-Citations46LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

AbstractD‐Arabinose (I) liefert mit Cyanamid das Oxazolin (II), das mit Cyanacetylen (III) ein Addukt (IV) gibt, aus dem mit Wasser oder Säure das 2,2′‐Anhydro‐ l‐β‐D‐arabinofuranosyl‐cytosin (Va) gebildet wird.

AbstractD‐Ribose kann in wäßriger Lösung durch Orthophosphat in β‐D‐Ribose‐1‐phosphat übergeführt werden, jedoch ist die 2‐Hydroxyfunktion erforderlich, da 2‐Desoxy‐D‐ribose nicht angegriffen wird.

The synthesis of 4-aminoimidazole-5-carbonitrile and its derivatives from HCN has been discussed in a preceding paper. It is shown here that these imidazoles are readily cyclized to mono- and di-substituted purines. Since the photochemical synthesis of 4-aminoimidazole-5-carbonitrile from HCN is considered to be a particularly plausible prebiotic pathway, the conversion of 4-aminoimidazole-5-carbonitrile and of its hydrolysis product 4-aminoimidazole-5-carboxamide to adenine and guanine are examined in some detail

The isomers of 6-ribosylaminopurine (N6-ribosyladenine) are formed in up to 74% yield when a dry mixture of adenine and ribose is heated. Under these conditions ribose also reacts with the primary amine group of adenosine, guanosine and probably guanine to form the corresponding ribosylaminopurines, while hypoxanthine fails to react. In the presence of Mg2+ and inorganic polyphosphates the natural nucleosides are also formed. Maximum yields of β-inosine, β-adenosine and β-guanosine were 8%, 4% and 9%, respectively.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBridged Polycyclic Compounds. XXXIX. Addition of Acetic Acid to Norbornadiene. Mechanisms of Addition Reactions1Stanley J. Cristol, Terence C. Morrill, and Robert A. SanchezCite this: J. Org. Chem. 1966, 31, 9, 2719–2725Publication Date (Print):September 1, 1966Publication History Published online1 May 2002Published inissue 1 September 1966https://pubs.acs.org/doi/10.1021/jo01347a001https://doi.org/10.1021/jo01347a001research-articleACS PublicationsRequest reuse permissionsArticle Views89Altmetric-Citations11LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBridged Polycyclic Compounds. XXXVI. Rearrangements in the Acetolysis of exo-Dehydro-2-norbornyl p-Bromobenzenesulfonate1Stanley J. Cristol, Terence C. Morrill, and Robert A. SanchezCite this: J. Am. Chem. Soc. 1966, 88, 13, 3087–3090Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published inissue 1 July 1966https://pubs.acs.org/doi/10.1021/ja00965a036https://doi.org/10.1021/ja00965a036research-articleACS PublicationsRequest reuse permissionsArticle Views43Altmetric-Citations19LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBridged Polycyclic Compounds. XLII. The Mass Spectral Analyses of Deuterated and Undeuterated Bridged Polycyclic Acetates1Stanley J. Cristol, Robert A. Sanchez, and Terence C. MorrillCite this: J. Org. Chem. 1966, 31, 9, 2738–2741Publication Date (Print):September 1, 1966Publication History Published online1 May 2002Published inissue 1 September 1966https://pubs.acs.org/doi/10.1021/jo01347a004https://doi.org/10.1021/jo01347a004research-articleACS PublicationsRequest reuse permissionsArticle Views35Altmetric-Citations10LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBridged Polycyclic Compounds. XLI. The Uncatalyzed Addition of Acetic Acid to Norbornadiene1Stanley J. Cristol, Terence C. Morrill, and Robert A. SanchezCite this: J. Org. Chem. 1966, 31, 9, 2733–2737Publication Date (Print):September 1, 1966Publication History Published online1 May 2002Published inissue 1 September 1966https://pubs.acs.org/doi/10.1021/jo01347a003https://doi.org/10.1021/jo01347a003research-articleACS PublicationsRequest reuse permissionsArticle Views50Altmetric-Citations11LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts