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  • Digitale Medien  (8.263)
  • 2000-2004
  • 1960-1964  (5.165)
  • 1920-1924  (1.847)
  • 1915-1919  (1.251)
  • Organic Chemistry  (5.033)
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  • Biochemistry and Biotechnology  (223)
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  • Digitale Medien  (8.263)
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  • 101
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 25 (1964), S. 69-78 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Durch Umsetzung der Silbersalze von Carbonsäuren mit NOCl wurden 14 Acylnitrite hergestellt. Die Verbindungen besitzen reproduzierbare Zersetzungspunkte, die zwischen 50 und 125° liegen. In Chlorbenzol als Lösungsmittel zersetzen sie sich nach I. Ordnung mit Aktivierungsenthalpien um 30 kcal/Mol und Aktivierungsentropien um + 10 cal/Mol · Grad. Die Zersetzungsgeschwindigkeit von Acylnitriten R—COONO steigt bei Variation von R in der Reihe \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Ph} 〈 {\rm n} - {\rm Pr} \sim {\rm n} - {\rm Am} 〈 {\rm i} - {\rm Pr} \sim 2 - {\rm Am} \sim 3 - {\rm Am} 〈 {\rm ter} - {\rm Bu} \sim {\rm PhCH}_2, $$\end{document} ist also um so größer, je stabiler R als Radikal ist. Bei der Zersetzung in Chlorbenzol oder o-Dichlorbenzol steht die Disproportionierung nach \documentclass{article}\pagestyle{empty}\begin{document}$$ 2{\rm R}\hbox{--}{\rm CO}\hbox{--}{\rm ONO}\,\, \to \,\,({\rm R}\hbox{--}{\rm CO})_2 {\rm O}\,\, + \,\,{\rm N}_2 {\rm O}_3 $$\end{document} im Vordergrund, in der Gasphase bei etwa 200° findet fast ausschließlich eine radikalische Nitrosodecarboxylierung nach \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm R}\hbox{--}{\rm CO}\hbox{--}{\rm ONO}\,\, \to \,\,{\rm R}\hbox{--}{\rm NO}\,\, + \,\,{\rm CO}_2 $$\end{document} statt.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 102
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 154-157 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Es wird eine verbesserte Herstellungsmethode für temperaturbeständige Kationenaustauscher durch die Reaktion von Benzylsiloxansulfosäure mit Kieselgallerte beschrieben und mit bekannten Herstellungsmethoden verglichen.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 103
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Die stereospezifisch-katalytischen Wirkungen von Strychnin, Brucin, Benzoylchinin und den Acetylderivaten von Chinin, Dihydrochinin, Cinchonidin, Chinidin, Dihydrochinidin und Cinchonin gegenüber Alkoholadditionen an Phenylmethyl- und Phenyl-α, o-trimethylenketen wurden im Temperaturbereich von -95 bis+60°C untersucht. Es zeigte sich, daß Katalysatoren gleicher Konfiguration ähnliche Temperatur-Spezifitäts-Funktionen ergeben, obgleich die Spezifität bei Raumtemperatur stark von kleinen konstitutionellen Variationen beeinflußt wird. Für einige der gefundenen Stereospezifitäten wird eine konformationsanalytische Deutung versucht.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 104
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 231-238 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Analytisch reine α-Ketosäuren, besonders die Trimethylbrenztraubensäure, kondensieren beim Aufbewahren unter Kühlung, wobei die α-Carbonylgruppe eines Moleküls mit der Säurehydroxylgruppe eines zweiten Moleküls unter Bildung sogenannter aktivierter Ester reagiert. Im Falle der Trimethylbrenztraubensäure konnte das entstehende dimere Produkt isoliert und identifiziert werden. Die Kinetik des basenkatalysierten Zerfalles der dimeren Trimethylbrenztraubensäure wurde studiert.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 105
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 274-282 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Conductometry, colorimetry, pH and Refractive Index of the mixed solution of uranyl acetate and glycine revealed the existence of three complexes in (1:1), (1:2) and (1:3) molecular ratios. The compounds were crystallized and petrographic studies of the crystals were made.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 106
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 143-147 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Zur Untersuchung der Biosynthese des Cytisins wurden Cadaverin-(1,5-14C) und Lysin-(2-14C) an Cytisus laburnum verabreicht. Für die Alkaloide Cytisin und N-Methylcytisin wurden die spezifischen Einbauarten bestimmt. Durch einen übersichtlichen Abbau konnten die Kohlenstoffatome 2,3,4,5 und 11 auf ihre Radioaktivität hin untersucht werden. Ein möglicher Biosyntheseweg des Cytisins wird diskutiert.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 107
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 164-182 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Es wird die Problematik der Synthese und der Reinigung folgender Verbindungen mit komplexbildenden Atomgruppierungen beschrieben: Di-(4-aminobenzimidazolyl-2)-methan und -äthan; N,N'-Di-(2-methylenbenzimidazol)-äthylendiamin; Dibenzimidazolyl-2,2′-disulfosäure-4,4′; Methan- und Äthan-1,2-di-(benzimidazolyl-2-sulfosäure-4); Diimidazolyl-2,2′-disulfosäure-4,4′; 1,2,4,5-Di-(2-aminomethylimidazolyl-4,5)-benzol und 2,6-(lin.-Diimidazolylbenzol)-dipropionsäure.Erläutert werden ferner die Konstitutionsbeweise dieser Verbindungen durch Abbaureaktionen, Vergleich von IR-Spektren bzw. durch Molgewichtsbestimmungen mit Hilfe potentiometrischer Titrationen.
    Materialart: Digitale Medien
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  • 108
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 226-230 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Durch die Umsetzung von Dialkyldiacyloxysilanen mit Aminen, von Dialkyldiaminosilanen mit Säuren, von Dialkylaminochlorsilanen mit Alkalisalzen von Säuren und von Dialkyldiacyloxysilanen mit Dialkyldiaminosilanen werden Dialkylaminoacyloxysilane erhalten, die hydrolytisch zu Ammoniumsalzen und Polysiloxanen, thermisch zu Amiden und Polysiloxanen zerfallen.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 109
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 24 (1964), S. 246-268 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Es werden Synthesen und der Strukturbeweis für das Ion (10) beschrieben. Dieses zeigt ambidentes Verhalten, d. h. es reagiert in Abhängigkeit von der Nucleophilie des angreifenden Partners an zwei verschiedenen Stellen. Das Ergebnis hängt von kinetischer bzw. thermodynamischer Produktkontrolle ab. Die allgemeine Bedeutung dieser Befunde wird diskutiert.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 110
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 83-89 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Aus den bei der Trennung von Seltenen Erdmischungen an einer mit Di(2-äthylhexyl)-phosphorsäure beladenen Säule gewonnenen Elutionskurven wurden die Trennfaktoren für benachbarte Seltene Erden sowie die Abhängigkeit der Verteilungsverhältnisse von der Konzentration der als Elutionsmittel benutzten Salzsäure berechnet und annähernd die gleichen Werte wie bei der flüssig-flüssig-Extraktion gefunden. Unter Berücksichtigung des mittleren Trennfaktors für benachbarte Seltene Erden wurde dann eine Anordnung konstruiert, die es erlaubt, die Konzentration der Salzsäure im Verlauf der Elution so zu ändern, daß jede Seltene Erde die Trennsäule mit dem gleichen Verteilungsverhältnis verläßt. Mit dieser Anordnung ist eine Trennung aller Lanthaniden möglich.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
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  • 111
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 113-119 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The composition and stability of Indium-Alizarin Red S has been studied. The pink coloured chelate has a λmax 530 mμ and a composition of 1:2 (metal:chelating agent). The chelate is stable between pH 3.0 to 6.5. The value of log K (K = stability constant) as calculated by two different methods using absorbance data is 9.0 and 9.4 respectively at pH 4.0 at 25°C. A method for the determination of indium using this reagent has been described. The coloured complex conforms to BEER's law over the indium concentration of 0.23 to 27.54 ppm. The suitable pH for the measurement of absorbance is 3.8 to 4.5. Temperature has no effect on the intensity of the colour. The sensitivity is 0.046 γ/cm2. The interferences by added foreign ions have also been investigated.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 112
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 137-139 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Determination of the composition between uranium and Chromotropic Acid salt chelate (λmax 435 mμ) has been described. The composition as determined by the absorptiometric measurements using the mole ratio method and the slope ratio method has come out to be 1:1.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 113
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 155-158 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 7-Acetonyl-8-chlor(-(bzw. brom)-)theophyllin setzt sich mit Dialkylaminoalkylenaminen bereits unter milden Bedingungen zu 7-Acetonyl-8-(dialkylamino-alkylen-amino)-theophyllinen um.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 114
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 184-194 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 1,3-Disubstituierte Schwefelsäurediamide lassen sich mittels Essigsäureanhydrid in Gegenwart katalytischer Mengen konzentrierter Schwefelsäure bei 50°C mit Ausbeuten von 75-86% der Theorie am Stickstoff acetylieren. Die Acetylderivate sind gegen Laugen sehr empfindlich und werden zum Ausgangsamid deacetyliert. Die neuen Verbindungen lösen sich in konzentrierter Schwefelsäure unter Abspaltung der Acetylgruppe.Die Darstellung der entsprechenden 1,3-Dibenzoylderivate mißlang, da die Stickstoff - Schwefel-Bindung der Amide durch Acylgruppen erheblich geschwächt wird.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 115
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 304-313 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Die Addition von Nitrosylchlorid an 30 Olefine wurde in Chloroform als Lösungsmittel bei 0° kinetisch verfolgt. Die Reaktionsgeschwindigkeit wird in erster Linie durch elektronische Effekte beeinflußt; bei stark verzweigten Olefinen läßt sich auch eine sterische Hinderung nachweisen. Die Aktivierungsparameter wurden für die NOCl-Addition an Styrol und an Cyclohexen bestimmt: die Aktivierungsenthalpien lagen mit 8,1 bzw. 9,3 kcal/Mol sehr niedrig, die Aktivierungsentropien betrugen -43,0 bzw.-36,9 cal/Mol · grd. Bei Variation des Lösungsmittels ändern sich die Geschwindigkeiten der NOCl-Addition an Styrol und an Cyclohexen stark, und zwar steigen sie in der Reihenfolge \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{c} {\rm MeOH} 〈 {\rm Et}_{\rm 2} {\rm O} 〈 {\rm CCl}_{\rm 4} \sim{\rm PhCH}_{\rm 3} 〈 {\rm n - C}_{\rm 7} {\rm H}_{{\rm 16}} 〈 {\rm PhCl} 〈 {\rm 00000}_{\rm 2} \\ 〈 {\rm PhCN} 〈 {\rm CH}_{\rm 2} {\rm Cl}_{\rm 2} 〈 {\rm PhNO}_{\rm 2} 〈 {\rm CHCl}_{{\rm 3}{\rm .}} \\ \end{array} $$\end{document} Durch LEWIS-Säuren läßt sich die Reaktion nicht beschleunigen.
    Zusätzliches Material: 7 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 116
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 10-19 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Zur Charakterisierung von Bis-chlormethyl-toluolen wurden die entsprechenden Bis-hydroxymethyl-toluole sowie ihre Acetate, Benzoate, p-Nitrobenzoate und Phenyläther dargestellt.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 117
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 38-42 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Zwei neue Wege für die Herstellung von Chlormethylsulfochlorid werden beschritten. Ferner wird die Synthese von einigen chlorierten aliphatischen, araliphatischen und aromatischen Sulfochloriden beschrieben.
    Materialart: Digitale Medien
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  • 118
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 47-53 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Bei der Umsetzung von Cyclohexanol oder 1-Methylcyclopentanol-1 mit Natriumazid und Schwefelsäure bilden sich mehrere flüchtige basische Produkte, die mit Butanol-Eisessig-Wasser 4:1:5 papierchromatographisch gut trennbar und mit Ninhydrin anfärbbar sind. Hierbei zeigt sich, daß sowohl aus Cyclohexanol (bzw. Cyclohexen) wie auch aus 1-Methylcyclopentanol-1 eine wasserdampfflüchtige Verbindung gebildet wird, die mit Ninhydrin schön gelb anfärbbar ist und im Rf- Wert in beiden Fällen übereinstimmt. Die Untersuchungen ergaben, daß es sich um die gleiche Verbindung der Formel C6H11N, einer einfach ungesättigten Base handelt. Diese basische Verbindung, die in etwa 12proz. Ausbeute bei der Aufarbeitung der Umsetzungsprodukte von Natriumazid mit Cyclohexanol oder mit 1-Methylcyclopentanol-1 isoliert werden konnte, wurde als 2-Methylpiperidein identifiziert. Bei Cyclohexanol bildet sich neben Ammoniak und weiteren im System Butanol-Eisessig-Wasser trennbaren Produkten(1) in größerer Menge eine plastische Masse, während beim 1-Methylcyclopentanol-1 neben Ammoniak und Methylamin ein höhersiedendes Gemisch einbasischer Verbindungen der ungefähren Zusammensetzung C12H21N, das im Papierchromatogramm vergleichsweise beim Rf-Wert des n-Hexylamins liegt und mit Ninhydrin bräunlichgelb anfärbbar ist, in etwa 12proz. Ausbeute isoliert werden konnte. Im Verteilungssystem 2-Äthylhexanol-Ameisensäure-Wasser 4:1:5 gelang es, dieses Basengemisch papierchromatographisch in zwei mit Ninhydrin gelb bzw. gelbbraun anfärbbare Haupt- und eine violett anfärbbare Nebenkomponente aufzutrennen, die vergleichsweise alle im Rf-Wert beim n-Hexylamin liegen.
    Materialart: Digitale Medien
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  • 119
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 71-76 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Durch Extraktion von Vanadium (V), Eisen (III), Kobalt (II) und Mangan (II) aus salzsaurer Lösung mit Tri-n-und Tri-iso-butylphosphat (TnBP und TiBP) wurde die größere Extraktionsfähigkeit des TnBP nachgewiesen. Eine einwandfreie Deutung dieser experimentellen Tatsachen wird durch unvollständige Kenntnisse der Kinetik der Extraktionsvorgänge erschwert. Mitverantwortlich können die geringere Elektronenanregungsenergie des Sauerstoffs der Phosphorylgruppe im TnBP und gewisse sterische Hinderungen bei der Extraktion mit TiBP sein.
    Materialart: Digitale Medien
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  • 120
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Von wäßrigen Lösungen der (1-7)-Phenyl-n-tetradecan-p-sulfonate, der (2-7)-Benzyl-n-tridecan-p-sulfonate und der isomeren p-Di-n-alkylbenzolsulfonate mit insgesamt 14 C- Atomen in den Seitenketten werden die Oberflächenspannung in Abhängigkeit von der Konzentration am Stalagmometer bestimmt, die kritische Mizellkonzentration durch Leitfähigkeitsmessung ermittelt und Angaben über die Wasserhärtebeständigkeit sowie das Schaumvermögen mitgeteilt.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
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  • 121
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 119-127 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Die Hydrolyseempfindlichkeit der Borsäureester einerseits und die Bildung von Borsäureestern aus mehrwertigen Alkoholen und Borsäure in wäßriger Lösung andererseits sind zwei gegeneinander stehende Beobachtungen, deren scheinbarer Widerspruch durch den Nachweis geklärt wird, daß der Borsäureester ein Mol Wasser unter Bildung einer stabilen Estersäure mit vierbindigem Bor koordinativ zu binden vermag. Die konformativen Voraussetzungen für die Bildung cyclischer Borsäureester und für die Wasseranlagerung werden erörtert.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
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  • 122
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 259-274 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Die MICHAEL-Addition von Methylvinylketon und ähnlichen Verbindungen an 1-Acetyl-2-arylalkyl-3-carbalkoxy-4-piperidione in Gegenwart von Triäthylamin liefert Derivate des 1-Carbalkoxy-2-arylalkyl-3-aza-6-hydroxy-bicyclo-[3,3,1]-nonanons-(9). Diese Verbindungen zeichnen sich durch typische IR-Spektren aus. Der Azabicyclo-[3,3,1]-nonanon-Typ wird durch eine unabhängige Synthese bewiesen, sowie durch das UV- und IR-Spektrum eines durch Dehydratisierung entstehenden ungesättigten Ketons, das nach der BREDT-Regel nicht α,β-ungesättigt sein kann, sondern vielmehr die typischen Homokonjugations-Banden eines β,γ-ungesättigten Ketons zeigt.Die Azabicyclo-[3,3,1]-nonanon-Derivate lagern sich (mit zwei Ausnahmen) in Gegenwart von Natrium-methylat glatt in 1-Arylalkyl-2-acetyl-6-keto-9-carbalkoxy-10-hydroxydecahydroisochinoline um, die in konzentrierter Salzsäure leicht α,β-ungesättigte Ketone liefern, was zugleich den Isochinolintyp beweist.Einige mit der Addition zusammenhängende stereochemische Fragen werden kurz diskutiert.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
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  • 123
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 298-300 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Bei der gemeinsamen Einwirkung von Cyanamid und Schwefel auf Ketone entstehen 4,5-disubstituierte 2-Aminothiazole.
    Materialart: Digitale Medien
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  • 124
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 324-328 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Durch Kondensation der entsprechenden Methylketone mit Trisformylaminomethan wurden Pyrimidin-Analoga einiger polycyclischer Kohlenwasserstoffe dargestellt.
    Materialart: Digitale Medien
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  • 125
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 25 (1964), S. 79-87 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Unter Benutzung von radioaktiv indiziertem Europium wurden optimale Arbeits bedingungen für eine Verteilungschromatographiesäule, die an silikonisiertem Silicagel adsorbierte Di-(2-äthylhexyl)-phosphorsäure als stationäre Phase enthielt, ermittelt. Dabei wurde die Abhängigkeit der effektiven Bodenhöhe von der Beladung mit unverdünnter Alkylphosphorsäure, Elutionsgeschwindigkeit und -temperatur, Korngröße und Packungsdichte des Silicagels, Konzentration der in Toluol gelösten Alkylphosphorsäure und der als Elutionsmittel benutzten Salzsäure sowie der Belastung der Säule mit Europium untersucht.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 126
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 25 (1964), S. 141-149 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Durch ozonhaltigen Sauerstoff oxydierte Polyolefine (Nieder- und Hochdruckpolyäthylen, Polypropylen sowie Polyisobutylen) wurden infrarotspektroskopisch untersucht. Im Anfangsstadium des Oxydationsprozesses werden im Fall der Polyäthylene vorwiegend Aldehyd- und Estergruppen, beim Polypropylen Keto-, Aldehyd- und Estergruppen und beim Polyisobutylen Keto- und Carboxylgruppen gebildet. In den Polyolefinen vorhandene C=C-Bindungen verschwinden bereits nach kurzer Ozoneinwirkung.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 127
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 25 (1964), S. 294-300 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Es werden m-Hydroxyarylphosphine und -phosphinoxyde durch Entmethylierung der entsprechenden Methoxy-Derivate dargestellt.
    Materialart: Digitale Medien
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  • 128
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 25 (1964), S. 326-328 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: p-nitrobenzene azochromotropic acid (Chromotrope 2 B) forms a 1 : 1 reddish violet chelate (λmax 540 mμ) with lanthanum(III) at pH 6.0. The value of stability constant expressed as log K = 4.5 and 4.9 as determined by two different methods. The colour of the chelate is stable over a wide range of temperature (0-100°) between pH 4.0 and 7.0. The system obeys BEER'S law over a range of 0.34 p. p. m. to 16.7 p. p. m. of lanthanum.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 129
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 15-23 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Die WITTIGSCHE Methode zur Herstellung von Natriumtetraphenylboranat aus Borfluorid und Phenylmagnesiumbromid in Äther konnte durch Verwendung von Tetrahydrofuran an Stelle von Äther wesentlich verbessert werden. Billiger jedoch ist die Umsetzung von Borsäuretrialkylestern mit der GRIGNARD-Verbindung. Die Darstellung von Natriumtetra-p-chlorphenylboranat und Natriumtetra-p-diphenylylboranat wird beschrieben.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 130
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 48-53 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 7-Acetonyl-8-chlor-bzw. (Brom)-theophyllin setzt sich bei Gegenwart von Alkalien mit Aminosäuren zu 7-Acetonyl-8-aminosäuren-theophyllinen um.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 131
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 309-312 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In the normal parathyroid gland of the mouse there is only one type of cell which is small with a large nucleus and small amount of cytoplasm. In order to investigate the effect of relaxin on parathyroid histology, mice were injected with relaxin, the degree of pubic separation was measured by the x-ray technique, and the parathyroid glands were studied histologically. After one day of relaxin injection, the pubic symphysis showed a distinct separation and in part of the parathyroid gland the cells were larger and stained lighter and pinker than the normal cells with hematoxylin, eosin, and azur II. After four days of relaxin treatment, the whole gland had changed so that all the cells were of the second type. Glands of pregnant mice near term also were composed of cells of this type. These results indicate a relationship between relaxin and the parathyroid gland.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 132
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Thalidomide injury to an implanted armadillo blastocyst is presented. This finding confirms the specific damage by thalidomide to the embryoblastic cells. The lack of damage to the trophoblast at this stage permits a normal implantation of the blastocyst in the uterine mucosa.
    Materialart: Digitale Medien
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  • 133
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 181-189 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Although melanoctyes appear to be limited to the hair folicles of adult belly skin of the PET mouse, they are found throughout the integument of the newborn. Trauma applied to the ventral belly skin of newborn PET mice results in the maintenance and augmentation of the melanocytes within the skin, even after the formation and growth of hair. The area immediately surrounding the site of trauma shows an increase in the number of melanocytes, apparently due in part to the disruption of the developing follicles and the consequent release of their pigment cells to the skin. UV irradiation also maintains a system of melanocytes within the ventral belly skin of PET mice.The significance of the maintenance and augmentation of melanocytes from the newborn into the adult by surgical trauma or UV radiation is discussed.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 134
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 225-235 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The histology of the anterior hypophysis, thyroid and gonads of dwarf (dw) and Ames dwarf (df) mutants of Mus musculus was compared. Orange G, aldehyde fuchsin and PAS stains were used to differentiate cells of the hypophysis. In both types of dwarf the anterior hypophysis was small, acidophils were lacking and the number of thyrotropic hormone producing cells was reduced. The thyroids were reduced in size, the follicles were small and some tissue was not organized into follicles. Testes were nearly normal. Ovaries were small and large follicles and corpora lutea were lacking.Growth hormone (STH) and thyrotropic hormone (TSH) were administered to both types of dwarfs. The treatment had no effect on the anterior hypophysis but number and size of follicles in the thyroid was increased The response was greater in df dwarfs; STH and TSH had more effect than STH alone. Testes of treated mice were only slightly changed but most of the df and some dw males became fertile. The ovaries became large and functional. Thyroids of dwarfs treated with thyroxine were not changed.It is concluded that the primary hormone deficiencies in both types of dwarf are the same, but that there are physiological differences as revealed by responses to STH and TSH treatment.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
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  • 135
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: This study was undertaken to determine the relationship between Marshall's metalophilic reticular cells and the cells exhibiting non-specific esterase and acid phosphatase activity in the rat spleen. Untreated and stimulated animals were used. Observations were made chiefly on the marginal metalophils of Snook. These cells showed strong acid phosphatase activity but only slight non-specific esterase activity in untreated animals. Following stimulation non-specific esterase activity increased in these cells. Within the nodules metalophilic reticular cells were always more numerous than cells with enzyme activity. Many of these metalophilic cells developed enzyme activity following stimulation. By the use of a restaining technique it was shown that all reticular cells possessing enzyme activity were also metalophilic but that the converse was not true. No mitotic activity was present in these cells.The results suggest that Marshall's metalophils are cells of the reticuloendothelial system in various stages of maturation and that, following stimulation, they may differentiate into mature phagocytic cells.
    Materialart: Digitale Medien
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  • 136
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 137
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Densities of the various bone fractions i.e., water, organic, volatile inorganic and ash fractions, as well as fat in the various animals have been studied. However. values reported by various workers failed to show consistency and uniformity, especially with respect to the volatile inorganic (often called “CO2 fraction”) and the ash fractions. These densities are prerequisite to the study of the volumetric composition of bone and bone marrow.In our study, the fat and organic densities found were similar to those previously reported. The volatile and non-volatile inorganic (ash) fractions, had density values of 1.684 and 3.180, respectively. The ash density was much higher than values previously reported but it verifies a theoretical value deduced by the authors from published work.Our higher ash density was due to a smaller measured volume of this fraction obtained by applying a negative pressure to remove the small entrapped air bubbles from the ash sample prior to the water displacement measurement. Because a smaller portion of the total inorganic volume was used for the ash calculation, giving it a higher density, a larger balance of the total inorganic volume was left for the volatile inorganic density calculation. This accounted for ash and volatile inorganic densities which were higher and lower, respectively, than such values previously reported.Prior to the determination of the density of the non-volatile inorganic fraction, the ashing time and temperature were studied. Curves plotted from the results of such studies were described and explained.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 138
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The two uterine horns in the adult are joined caudally to form an externally undivided segment consisting of a cranial and a caudal part. The cranial part becomes wide and swollen at its junction with the horns. It contains two lumina separated by a midline septum and is designated as the uterine body or corpus. The narrow and slightly tapered caudal part projects into the cranial portion of the vagina. It contains a single lumen or canal and is designated as the uterine neck or cervix. The wall of the cranial two-thirds of the adult cervix contains a relatively large amount of circularly arranged smooth muscle fibers. In contrast, its caudal one-third consists chiefly of a network of collagen fibers. During cervical development argyrophilic fibers first appear in sections of cervical wall from mice sacrificed at birth. Collagen and smooth muscle fibers are first stainable with the Mallory method in cervical wall sections from mice one week old. During pregnancy and after combined treatment with estradiol, progesterone and relaxin the collagenous fiber bundles of the cervix become looser and more widely separated. This is associated with an increased dilatability of the cervical canal and increased stainability of the ground substance. The muccopolysaccharide(s) demonstrable histochemically in the cervix of the mouse was digestible with testicular hyaluronidase.
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  • 139
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 140
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The in situ thymus of the guinea pig was labeled locally with H3-thymidine and sections of various tissues analyzed by radioautography for the location of labeled cells which might have left the thymus from 30 minutes to three days after labeling. Labeled lymphocytes were located especially in the mesenteric lymph nodes and spleen, giving direct evidence for the migration of thymocytes under near-physiological conditions. Only a few cells were found in the bone marrow, and none in the liver. The identified cells were not seen to be undergoing subsequent proliferation, but about one-fourth of them were transforming to other cell types - plasma cells, heterophil granulocytes, reticular cells, and macrophages. The fate of another portion of the cells seemed to be loss to the gut lumen through the mucosa. These data suggest that a normal function of the thymus of the adult guinea pig is the proliferation of a population of pluripotential stem cells which, after migration to other tissues, may further differentiate under appropriate stimulus. Possible applications of the local labeling technique are indicated.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
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  • 141
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The rate of skeletal maturation as indicated by ossification of bony elements of the central and appendicular skeleton was compared in two groups of hypothyroid young rats, raised at 20°C and 30°C constant environment respectively.Hypothyroidism was induced by feeding 0.2% propylthiouracil mixed with the food in powdered form to pregnant rats starting on the fifteenth day of gestation and continuing this treatment to the suckling mother until their litters had reached weaning age.The appearance of epiphyseal centers, of carpal and tarsal centers, middle phalanges and femoral and tibial processes and caudal vertebrae 7-27 is delayed in hypothyroid newborn rats over that of normal controls. Hypothyroid rats raised at 20°C lag more severely behind the controls with respect to skeletal maturation, than do hypothyroid rats raised at 30°C. The latter are intermediate or in some instances their rate of skeletal maturation resembles that of the control group.The possible significance of the demonstration of diminished requirements for thyroid hormone by the developing rat for studies attempting to identify mechanisms of hormone action in development is briefly discussed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 142
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A cephalometric radiographic appraisal of vertical skull growth occurring during the interim of one year was made on 71 caucasoid males at the Baylor University College of Dentistry, Dallas, Texas. The subjects were from 22 to 34 years of age. The dimensions assessed were the total skull height, the anterior cranial height, total facial height, upper facial height. and lower facial height. A significant increase was shown to occur in all the dimensions over a period of one year except in the dimension of anterior cranial height. It was concluded that skull growth does occur in male adults after the age generally accepted as that of maturity.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 143
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 243-247 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: To ascertain the pathway (s) along which forces are conducted from the hand to the humerus in the human cadaver specially designed pressure sensitive transducers were introduced into the radio-capitular and ulnar-trochlear components of the elbow joint. A constant force was applied to the hand, and changes in electrical resistance and hence pressure across the elbow joint where recorded. It was observed that 57% of the force applied crossed the radio-capitular joint while 43% crossed the ulnar-trochlear joint. The pathway of this force transmission is discussed with particular reference to the involvement of the interosseous membrane.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 144
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 257-263 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Implants from the midbrain and cerebellum of neonatal rats were cultured in roller tubes for 20 to 30 days. The cultures were incubated in a tryptamine-tetrazolium solution which demonstrated the enzyme activity of monoamine oxidase (MAO) by the formation of a formazan precipitation. Some cultures were incubated without fixation, while others were fixed in a glutaraldehyde solution prior to incubation. The specificity of the reaction was controlled by withholding the substrate or by treatment of the cultures with an MAO inhibitor. An intracellular localization of the enzyme was observed in small and medium sized neurons, but was absent in the largest neurons. Neuroglial cells, including ependyma, and mesenchymal cells and phagocytes were MAO positive. The formazan granules were scattered throughout cell bodies and into cytoplasmic processes. Glutaraldehyde fixation of cultures prior to incubation for MAO preserved the details of cell structure and enhanced the differentiation of cell types. When fixed and unfixed cultures were compared, glutaraldehyde did not appear to interfere or interact with enzyme localization; however, there was evidence that this aldehyde might be interfering with MAO concentration, since a longer incubation period for prefixed tissue was required to obtain a formazan reaction comparable to that of unfixed cultures.
    Materialart: Digitale Medien
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  • 145
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Lymphatic plexuses from certain areas of serous cavities can be injected by a simple procedure which simulates the normal mechanism of absorption. Apparatus consists of a 500 ml filtration flask with side arm attached to a vacuum apparatus. Excised serous membranes are draped over the mouth of the flask and flooded with ink. Vacuum is applied intermittently, resulting in absorption and flow. The method can be applied to frozen and thawed tissue and is suitable for human autopsy material.
    Materialart: Digitale Medien
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  • 146
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 363-364 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: An anomaly of the termination of the aorta is described which is apparently unique. The aorta divided directly into two internal iliac arteries and two external iliac arteries.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 147
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 383-390 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A simple method leading to growth and mitosis in over 95% of shortterm cultures of lymphocytes from the blood, lymph or thymus of the rat is described. The method which is modified from Moorhead's original technique (′60) employs standard tissue culture medium (Eagles MEM or TC no. 199), 20% fresh rat serum, washed lymphocytes, penicillin, and phytohemagglutinin-P (0.01 cm3/cm3 of culture of a 1:5 dilution of stock solution). Details of culture technique and factors contributing to growth failures are discussed.The chromosomes of male and female Lewis rats were studied in metaphase spreads of cultured cells. The karyotypes of these rats are presented and found to be in agreement with those recently reported by Hungerford and Nowell (′63).
    Materialart: Digitale Medien
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  • 148
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The first statistically significant decline in the mean number of young born to female golden hamsters occurred in the fourth litters. The decreased size of fifth litters was highly significant and few females bore six litters.Hamsters unilaterally ovariectomized at 30 days of age had a significantly lower number of litters containing live young during their lifetime. Despite increased unilateral ovulaton, they bore less than half as many total young per female as intact controls and fetal resorptions and stillbirths occurred at an earlier age.The results of matings during the period of reproductive decline were observed in females from the age of ten months until death or sacrifice at an advanced age. Final litters contained few young, some born dead. One or two subsequent pregnancies were of term length but all conceptuses were resorbed. Few females beyond 15 months of age had implantation sites and most of these resorbed. Regular four day estrous cycles continued until a terminal illness and matings resulted in pseudopregnancy. Blastocysts were found at four and one-half days of gestation in some old females but not at 6 to 8 days. Failure of implantation appeared to be due to an inadequate uterine decidual reaction in the old animals.It appeared from the above observations that decreasing uterine adaptability limited reproductive capacity in aging hamsters.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 149
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Castrated and castrated and hypophysectomized female mice (BALB/c) were injected subcutaneously with estradiol-17β (0.5 μg or 1.0 μg/day) and progesterone (1.0 mg or 3 mg/day) in addition to prolactin (1.0 mg), oxytocin (1.0 IU) or growth hormone (1.0 mg), alone and in combination for 10 or 15 days. Twenty-four hours after the last hormonal treatment, tritiated thymidine (0.7 μc/gram body weight) was injected intravenously, and the mice sacrificed six hours later. Tissue from the inguinal mammary glands was removed and processed for radioautographic, histological and whole mount study.Radioautographs of hematoxylin stained sections of mammary tissue from each animal were selected. Under oil immersion, 2,000 epithelial cells were consecutively counted and the number of labeled cells noted. Results are expressed as the per cent of labeled epithelial cells.All hormonal treatment, except oxytocin alone, caused a significant increase in per cent of labeled cells as compared to castrated, untreated animals. The per cent of labeled cells depended, in general, on the dosage and duration of treatment. Combinations of growth hormone with estradiol-17β and progesterone did not augment epithelial proliferation. The addition of oxytocin or prolactin to the estradiol-17β (0.5 μg)  -  progesterone (1.0 mg) combination significantly increased the per cent of labeled cells.Prolactin, but not oxytocin, augmented epithelial proliferation in similarly treated castrated and hypophysectomized mice. Combinations of estradiol-17β (1.0 μg) and progesterone (3.0 mg) with oxytocin or prolactin did not significantly augment epithelial proliferation as compared to ovarian steroid treatment alone.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 150
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 503-504 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 151
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 449-461 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The prenatal development of the mandibular joint in mice was studied in fetuses at 15 to 20 days insemination age. The ramus of the mandible can be delineated as early as the fifteenth day by distinct differences in the degree of condensation of mesenchyme at the site of the future joint. The future condylar process of the mandible can be recognized in its relationship to the external pterygoid muscle, inferior alveolar nerve, Meckel's cartilage, pre-cartilaginous alisphenoid process of the future basisphenoid bone, and the anlage of the squamosal bone with its zygomatic process.Differentiation is rapid through the twentieth day of gestation at which time the following major elements of the joint can be recognized: a fibrous intra-articular disc continuous with the tendon of the external pterygoid muscle; a vascular synovial mesenchyme with upper and lower synovial spaces; an ossified squamosal bone with a fibrous joint lining; and a well developed condylar process with good representation of differentiating cells in the zones of chondrification and ossification.Among the elements not yet evident, however, are (1) hemopoietic marrow in the condyle, (2) a constricted neck at the base of the condyle, and (3) a fibrous capsule or capsular ligament.
    Materialart: Digitale Medien
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  • 152
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Thin slices of rat liver, kidney, and M. rectus femoris and thin, flat pieces of albumin-gelatin gels (which approximated the tissue slices in mass, dimensions and protein content) were immersed in formalin solutions at various concentrations, in some cases with variable amounts of NaCl (0.11-0.25M) added, and in some cases buffered at pH values ranging from 3.5-7.0. The slices were weighed at frequent intervals for the first 20 hours of immersion. Weight changes occurred rapidly. With the exception of the neutral buffered formalin curves, three families of response curves were obtained for the three tissues. With both formalin and formalinsaline solutions weight gain was inversely proportional to the solute concentration, but the formaldehyde particles apparently are not involved osmotically. The total osmotic concentration of formalin solutions, therefore, is not a factor in the swelling or shrinking of tissue slices. The presence of contaminants could be responsible for the effective osmotic concentration observed with these solutions. The weight response of slices is influenced by the pH of the formalin. Although the response of the gel system to any particular solution was quantitatively greater, it was qualitatively the same as the tissue slice response.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 153
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The numerical variations observed in the dentition of the northern sea lions, fur seals and seals are summarized as follows: (1) There is a reappearance of the right maxillary second molar in the northern sea lion dentition and of the first deciduous premolar in the fur seal dentition, which may be interpreted as examples of evolutionary recession towards the full mammalian dentition. (2) There is a complete tooth reduction of the molars in the sea lion dentition. (3) There is the presence of a “Dentes geminati” of the second premolar and the supernumerary tooth in the right upper jaw and of the supernumerary tooth between the second and third premolars in the left upper jaw of an adult fur seal, which may be associated with the division of the second premolar tooth germ. (4) There is an appearance of a pair of supernumerary teeth lying lingually to the root of lower permanent central (second) incisors, being of interest in suggesting that they are either the appearance of the successors of the recent central incisors or the reappearance of the permanent first incisors, in the fur seal dentition. (5) There is a tooth reduction in the permanent dental formula from \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm I}\,\frac{{\rm 3}}{{\rm 2}}{\rm C}\,\frac{{\rm 1}}{{\rm 1}}{\rm P}\,\frac{{\rm 4}}{{\rm 4}}{\rm M}\frac{{\rm 1}}{{\rm 1}}\,{\rm to}\,{\rm I}\,\frac{{\rm 3}}{{\rm 1}}{\rm C}\,\frac{{\rm 1}}{{\rm 1}}{\rm P}\,\frac{{\rm 3}}{{\rm 4}}{\rm M}\frac{{\rm 1}}{{\rm 1}} $\end{document} in the seal, which was associated with a “Dentes confusi” in the same category of the dentition.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 154
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 155
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 67-74 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Neuroanatomical nuclear configuration corresponding to the projection regions for the chorda tympani, the IXth, and the lingual nerves was studied in the cat thalamus by a combination of electrophysiological, stereotaxic, and histological techniques. Each of the three nerves innervating the tongue was dissected for stimulation in cats deeply anesthetized with Nembutal. Maps of the extent of the thalamic projection for a particular nerve were obtained by recording evoked potentials in the thalamus during the stimulation of one of these nerves. Such maps were correlated with the anatomical structures of the cat thalamus by reconstructing the recording sites from histological sections of the cat brain. It was found that the chorda tympani and the IXth nerve projection regions correspond closely to the ventromedial nuclear complex with slight encorachment on the lingual nerve projection region in the ventrobasal complex. The most medial portions of the taste nerve projection regions do not relay any tactile afferent impulses and the most lateral portion of the lingual nerve projection is not activated by impulses in the taste nerves. Therefore, it is suggested that the thalamic relay of taste is not coextensive with other lingual modalities in the cat thalamus but it has an independent representation in the ventromedial nuclear complex.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 156
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 75-79 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Analysis of age changes in physical characteristics of mouse limb bones requires a sensitive, consistent and relatively simple apparatus for determination of transverse breaking strength. The developed instrument is essentially a one meter counter-balanced 4-to-1 lever with a tracked, motor-driven weight on its upper surface. At the beam's short end a loading tool impinges upward on a bone mounted in an adjacent holder; at the opposite end is a mercury switch connected to a relay halting the weight motor when fracture occurs. Bones, with proximal ends embedded in convex securing blocks of impression medium, may be positioned in a standard relationship to the holder, loading tool edge, and the balanced beam.Repetitive loading of a steel spring indicates instrument error of 1.8%. Preliminary tests with a random series of paired mouse femora show no significant difference between left and right bones. In the long-term study it will be possible to correlate physical strength with other characteristics of opposite bones.An air-gap capacitor across loading tool and bone holder and coupled to a variable frequency oscillator permits monitoring of specimen elasticity on a strip-chart recorder.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 157
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 103-109 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A malformed human fetus with multiple congenital anomalies including absence of an umbilical artery is described. These anomalies include malpositioning of the apex of the heart; a “mirror image” position of the liver; mal-rotation of the gut with absence of external demarcation into small and large intestine; failure of development of the cloacal region with imperforate anus and absence of a urethra; undescended testes and bilaterally mal-placed scrotal sacs, but the presence of a median phallus in spite of the failure of the ventral abdominal wall to develop fully.Factors known to influence the production of fetal anomalies in man and animals are discussed and a brief review of the literature on single umbilical arteries, which are known to be associated frequently with congenital anomalies, is given.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 158
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Electron microscopic studies reveal that the red pulp of the rabbit spleen is composed of reticular cells, reticulum and elements of the blood circulating through it. The three types of reticular cells described follow no definite pattern as to types of spaces they line and are not always adjacent to a basement membrane. Similar or dissimilar cells may line a basement membrane on the same or opposing sides. The entire red pulp area is intercommunicating through pores and junctions of the several spaces and in that area in which no basement membrane exists, the cytoplasmic projections of the reticular cells form a meshwork of spaces. Terminal arterioles are seen to end in collapsed type channels with a change from endothelium to Type I reticular cells. These rapidly join dilated areas. The reticular network of the spleen appears as four types: homogeneous, fibrillar, a combination of these, and reticular cells only. Isolated cilia are found in the reticular cell cytoplasm and are shown to be associated with a basal body and a centriole. The investigation supported the hypothesis that the red pulp of the spleen in the adult rabbit is a functionally dynamic area constantly changing its histological structure, both regarding cells and state of the vascular channels.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
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  • 159
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 121-122 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 160
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 161
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 162
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Colloidal mercuric sulfide injected into the rete testis adhered to the stereocilia of the epithelial cells and subsequently moved into a highly developed canalicular system in the apical cytoplasm. The canalicular invaginations of the cell surface arising between the stereocilia lead to cytoplasmic vacuoles that concentrate the particulate matter. The limiting membrane of the stereocilia and of the canaliculi and vacuoles is covered by a layer of amorphous material. It is speculated that this may bind particles, molecules, and ions as does an ion exchange resin, and that it may, in this way, act as a carrier in the uptake and transport of substances by cells.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 163
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 507-516 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In this study the distribution of mast cells in the cephalic, middle, or caudal portions of the uterine horns did not differ. In cross-sections, however, mast cells were most numerous in the myometrium, intermediate in the tunica vasculare of the endometrium and least in the mucosa. In the endometrium, the mast cells were most numerous in the antimesometrial, least in the mesometrial and intermediate in the lateral quadrants. In the myometrium, however, the relative numbers of mast cells between the quadrants varied according to the day in the estrous cycle.On days 1 (the day after estrus), 2, 3, and 4, (the day of proestrus) of the estrous cycle, there were respectively 42.7, 21.8, 22.5 and 10.7 mast cells in the endometrium per 12 μ sections. The differences in means between groups was highly significant (P 〈 0.001). In mated females on 67, 79, 91, 103, 115, and 151 hours after ovulation, there were respectively 9.4, 8.4, 4.7, 5.6, 2.1, and 2.2 mast cells in the endometrium per 12 μ cross-section. The differences in the means were not significant.The mean number of mast cells per 12 μ cross-sections of uteri of ovariectomized females was 20 ± 8. Subcutaneous injections of 0.3 gamma estrogen did not significantly alter the number of mast cells but 0.6 gamma depressed the mean count to 11 ± 7.It appeared from these studies that the uterine mast cell numbers were related to the cyclic phenomena of estrous, but that the numerical relationship to the time of nidation was not clear.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 164
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 552-552 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 165
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: An analysis was made on 140 adult chickens of the relationship between visual estimation of the degree of encroachment of the lumen of the vessel by plaques and such morphometric variables as weight, length, circumference, thickness, density, and combinations thereof of the thoracic and abdominal segments of the aorta. Aortic weight and thickness functions were found to be significantly correlated to scores, accounting in the two highest cases (thickness and weight/area of the abdominal segment, body weight held constant) for 46% (r = 0.68) and 42% (r = 0.65) respectively, of the variability in score. Correlations were considerably lower in the thoracic segment, the highest being r = 0.36 for weight/circumference. The scoring thoracic segment, the highest being r = 0.36 for weight/circumference. The scoring system thus has a basis in measurable physical changes in the wall of the blood vessel, but scoring apparently evaluates considerably more than was measured by the morphometric variables. The morphometric variables would probably serve best as means of comparing different scoring systems and as objective supplements to scoring. The procedure of choice would appear to be weight/area with body weight held constant (i.e.  -  partial correlation and/or covariance analysis).
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
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  • 166
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 547-552 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In the literature the nutrient artery to the diaphysis of the canine femur has been described as arising from the medial circumflex femoral artery which is a branch of the deep femoral artery. However in 19% to 100 canine hind extremities dissected after injection with colored media, the femoral nutrient artery arose from a large muscular branch (the proximal posterior femoral) of the superficial femoral artery. In 17% of 42 dogs one femur only was supplied by this variant. In three additional femurs other variations occurred.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 167
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Following surgical removal of one eye, rats were permitted to survive for three days, one, two and four months, and before killing them they were injected with 2 mc of leucine-H3 intraperitoneally. The utilization of this radiochemical was investigated in the brain autoradiographically. In all groups of animals the uptake of radioleucine, as determined by microdensitometry, was significantly higher in the “degenerated” optic nerve and tract than in their “normal” counterparts, with the relative difference increasing with longer postoperative survival within the periods tested. This progressive net increase in the utilization of leucine-H3 was associated with an absolute increase in the number of glia cells. Similar, but attenuated, density differences were also obtained with relatively large-aperture measurements over the stratum griseum of the superior colliculus in which the optic tract fibers terminate. In contrast, small-aperture measurements of grain density over single neurons in the lateral geniculate nucleus showed no difference in the utilization of leucine-H3 between the normal and subtotally deafferented sides. This suggests an absence of transneuronal changes in protein metabolism in the visual system of the rat as long as four months after unilateral enucleation.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 168
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 573-579 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Fixation of the thyroid gland with formaldehyde-ethanol-acetic acid retains a larger proportion of colloid constituents than aqueous formaldehyde.Comparative histochemistry has revealed a larger proportion of protein, arginine, cabohydrates and iodinated material.The heterogeneous staining pattern was not observed after aqueous formaldehyde fixation.The intracellular globules and the early iodinated fraction of the colloid were similarly stained.Intracellular globules were not observed in aqueous formaldehyde-fixed tissues.Only the more slowly labeled fraction of the colloid (large follicles), was stained by toluidine blue and also by bromphenol blue without mercury, indicative of basic proteins.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 169
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 553-559 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The pleural cupola is covered by a distinct dome-shaped suprapleural membrane (Sibson's fascia) formed by a condensation of endothoracic fascia and continuous at its periphery with the more diffuse, loose endothoracic connective tissue lying between the ribs and the parietal pleura. This does not agree with the classic description of Sibson's fascia. It forms a discreet cervicothoracic cloison which can be readily separated from the pleura and adjacent mediastinal structures. Attaching to the membrane are the vertebromembranous, transversomembranous, and costomembranous bands which are formed by prevertebral fascia. In addition, the last two suprapleural bands receive contributions from the fibrous remains of the scalenus minimus muscle. The muscle was found to be present on one or both sides in 30 out of 64 bodies (46.8%). The suprapleural membrane and bands can become hypertrophied and fibrous as a result of pathology in this cupola area of the lung. The bands have been implicated in certain clinical syndromes.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 170
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 561-571 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Wistar strain albino rats were injected with 1 cm3 of a 1% solution of trypan blue. Three types of dye were used: Matheson, Coleman and Bell, Chroma-Gesellschaft and a highly purified sample. The dyes were injected on days 6, 7, and 8 of gestation. Fetuses were excised from days 16 through 20, fixed, decalcified where necessary, embedded in paraffin, serially sectioned and stained. Newborn young were treated similarly. Chroma-Gesellaschaft trypan blue was without reproductive or teratogenic effect at the above doses. Increasing the dose did not increase the teratogenicity but did yield a decrease in litter size. Both Matheson, Coleman and Bell trypan blue and the purified sample were teratogenic. The most frequent neural defect observed was hydrocephalus. Serial sections of the newborn hydrocephalics showed an occluded or extremely tenotic aqueduct of Sylvius in 31 of 33 sectioned animals. The fetuses collected from days 18 through 20 also had occluded or stenotic aqueducts if hydrocephalic. Aqueductal stenosis or occlusion was present in 17-day-old fetuses, but hydrocephalic was not conclusively demonstrated at this age. Sixteen-day-old fetuses did not have aqueductal occlusion in any of those examined, but stenosis was evident. It is concluded that the defect predisposing to hydrocephalus in the young of trypan blue treated rats of this strain is aqueductal stenosis or occlusion.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
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  • 171
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Testicular fragments from newborn, 4, 14, 24, 37-day old and mature rats were cultured using a modification of Trowell's method. Eagle's medium supplemented with amino acids, Na-pyruvate and 10% calf serum was employed. Tissue fragments were fixed at time intervals for histologic study. In cultures of fragments from newborn and four-day rats, gonocytes persisted and showed mitotic activity. In fragments from older but still immature animals, gonocyte-like cells occasionally undergoing mitosis, appeared in the germinal epithelium after the fourth day in culture. Spermatocytes survived for approximately four weeks. More rapid degeneration of the germinal elements beyond spermatogonia was observed in cultures of mature testes. During the first six days in culture, cells resembling gonocytes, some in mitosis, appeared in the tubules. The studies have shown that under the conditions employed, Sertoli cells and gonocyte-like could be maintained for at least four months in cultured fragments of testes from animals of various ages. In fragments from older animals, gonocyte-like cells appeared shortly after initiation of culture while the more mature germinal elements ultimately degenerated.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
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  • 172
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 605-609 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Follicular activity in the ovary of the pregnant hamster is divided into two periods. During the first eight days (corresponding to the duration of pseudopregnancy) an average of 11 follicles per ovary from 277 to 553 μ are present. From day 10 to 16 of pregnancy, the ovary contains 22 follicles ranging from 277 to 600 μ and larger. The day after parturition, atresia destroys all large multilayered and vesicular follicles.Hamsters injected with human chorionic gonadotropin on day 4 of pregnancy ovulated ten ova, whereas similary treated day 12 animals ovulated 35 eggs. No cyclic follicular activity corresponding to the length of the estrous cycle occurred during gestation. On the contrary, a constant increment of small follicles took place throughout pregnancy.
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    Materialart: Digitale Medien
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  • 173
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 591-597 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The morphology of the cecal mucosa and the topographic distribution of certain mucosal enzymes were compared in conventional and germfree mice to investigate the phenomenon of cecal enlargement observed in germfree animals. The cecal mucosa is predominantly non-villous in the conventional, but has a villous structure in the germfree mice. Alkaline phosphatase, in the conventional mice, is present in the striated border of a limited number of the epithelial cells lining the cecum; in the germfree mice almost all these epithelial cells show enzymatic activity. Acid phosphatase is more abundant in the epithelial cells and macrophages of the cecal mucosa of the conventional than of the germfree animals. Both groups show similar monoamine oxidase and reduced diphosphopyridine nucleotide diaphorase activity. The reduction of the villi, and the decrease in alkaline phosphatase activity in the conventional mice point to an involution of the mucosa as an absorptive organ. Barka ('63) has suggested that acid phosphatase may have a defensive function; its increase in the conventional animal would support this interpretation. The two oxidative enzymes studied apparently are not influenced by the intestinal flora.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 174
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 599-603 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: With the object of investigating the so-called “feed-back” mechanism whereby hormones from the various endocrine glands presumably influence the hypothalamus in its regulation of the hypophyseal tropic hormones, the effect of hypophysectomy, ovariectomy, thyroidectomy, adrenalectomy and adrenal medullectomy on the nucleolar size of neurons in 16 hypothalamic nuclei was studied. A total of forty-five female albino rats was used. The nucleoli were measured under oil by means of a Cooke AEI image splitting eyepiece. For every rat 50 nucleoli in each of the 16 hypothalamic nuclei was measured, a total of 36,000 measurements. Hypophysectomy was found to affect all of the nuclei either after a short period (5 days) or after 60 days. Ovariectomy (20 days) caused nucleolar size changes in six nuclei, thyroidectomy (30 days) in eight, adrenalectomy (14 days) in all of the nuclei and adrenal medullectomy (30 days) in all of the nuclei. The results indicate that the absence of the various hormones does affect the activity of hypothalamic neurons as determined by nucleolar size changes. The use of the present methods also appears to “localize” centers for specific activities in the hypothalamus in some instances (e.g. ovariectomy) but not in others (e.g. adrenalectomy).
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    Materialart: Digitale Medien
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  • 175
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The gross arterial blood supply to the trachea, primary bronchi, and esophagus of six normal domestic rabbits has been studied by the use of injection techniques followed by careful in situ dissections. Several patterns are described with more variation being apparent on the left side.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 176
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 631-632 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A plastic sealing compound for museum jars is described. It has the consistancy of toothpaste and is applied in a similar manner directly to the museum jar from a tube. No catalyst or mixing is required. Moisture in the air cures the plastic in 12-24 hours. After the extruded “rope” is applied, the lid is placed on the jar and the jar set aside for the cure. After cure any excess can be trimmed with a scalpel.
    Materialart: Digitale Medien
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  • 177
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 178
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Recent Primate research projejcts utilizing the squirrel monkey (Saimiri sciureus) established the need for basic biological data concerning this animal. Included in this present report are discussions of laboratory maintenance, dietary requirements, and antihelminthic thearpy. Original data on birth weight (90-100 gm) and the gestation period (167 ± 2 days) are recorded. The weight distribution of a colony of adult animals maintained in captivity for a period of three years is included. Fresh organ weights from ten animals obtained at necropsy were recorded for brain, pituitary, heart, lungs, spleen, liver, pancreas, kidney, adrenals, and gonads. Body weight, body length, and the length of the esophagus, stomach, duodenum, small intestine, cecum, and colon were recorded. Determination of hematologic values included erythrocyte and leukocyte counts, hemoglobin and hematocrit determination and differential count of white blood cells. Various blood chemistry values are included. Data on heart rate, respiratory rate and body temperature of animals restrained for a 24 hour period are tabulated. Environmental stress and neuroanatomical studies using the squirrel monkey are reviewed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 179
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The course of development of parabiotic anastomosis was followed with respect to time in Holtzman (Sprague-Dawley) parabionts. Comparison of non-irradiated pairs was made to pairs in which one of the partners had received 800 r. The development of the anastomosis was studied by determining the per cent transfer of CR51 labeled erythrocytes (which represented a cellular element) and radio-iodinated serum albumin (which represented a molecular element) from one partner to the other. Erythrocytes were found in the non-injected animal in small numbers at 22 hours after pairing; at 47 hours the rate of transfer became much more rapid. RISA was detected in the non-injected partner as early as five hours after pairing and accumulated steadily thereafter. Irradiation had no effect on the course of development of the parabiotic anastomosis as evidenced by similarity of accumulation rates of Cr51 labeled erythrocytes and RISA when compared to the non-irradiated pairs.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 180
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 23-35 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A light and electron microscopic study of the early changes which occur in cadmium necrosis of the testis of the mouse was made in an effort to identify the site of action of cadmium. Mice were given a single, intraperitoneal injection of 1% CdCl2 at a dosage of 0.1 ml/10 g body weight and then the testes were fixed for light and electron microscopy at various hourly intervals. The earliest changes which were appreciated by light microscopy consisted of an edema of the intertubular spaces, congestion of blood vessels, and an increased amount of granular precipitate in the connective tissue spaces. By electron microscopy the earlies changes were observed in the endothelium of the testicular vascular bed and consisted of a striking and rapid increase in the prevalence of pinocytotic vesticles suggesting an increased interchanges of fluid between the blood and extravascular spaces. All of these changes preceded any appreciable alteration in the cells of the seminal epithelium. The fact that the earliest alterations are observed in blood vessels suggests that the site of action of cadmium in the production of testicular necrosis is upon the endothelium of the vascular bed.A comparative series of animals (frog, pigeon, rooster, armadillo, opossum) was also investigated as to their susceptibility to the toxic effects of cadmium. the results from these species, and other species reported by previous investigators, suggest the generality that cadmium necrosis is a phenomenon common to species possessing scrotal testes and absent from those possessing abdominal testes. The opossum is an exception to this generality. These findings are discussed in relation to the blood supply of the testis.
    Materialart: Digitale Medien
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  • 181
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: First, using the methods of H3-thymidine autoradiography and counting mitotic index, cytokinetics of the matrix cells were studied in the telencephalon of normal mouse embryos at ten-days-postconcetpion, and various kinetic constants of the matrix cells were determined: Generation time, five hours 20 minutes; mitotic duration, 24 minutes; presynthetic resting time, two hours 36 minutes-one hour 36 minutes; DNA synthetic time, one hour 20 minutes; and post synthetic resting time, one-two hours. Based on this information, effects of two teratogenetic agents, x-rays and thio-TEPA, on the cellular proliferation were analyzed. By x-ray irradiation (200 r) only proliferating matrix cells are damaged in the neural tube, but not neuroblasts. The radiation induces a temporary block of the flow of the matrix cells through the cell cycle at the late t2 period so that the mitotic and DNA synthetic cells subsequently decrease in number. Some of the matrix cells that are captured at t2 period fail to tolerate the block, degenerate and are eliminated from the matrix layer. On the other hand, thio-TEPA, which was proved non teratogenetic to the C. N. S. in this experimental condition, causes a slight prologation of t2 duration, but does not significantly influence the proliferative process in the neural tube.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 182
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 49-55 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A purified diet lacking folic acid and containing 20 mg% of the antimetabolite, 9-methyl pteroylglutamic (folic) acid was fed to female Long-Evans rats during days eight and nine of pregnancy. Embryos were removed at autopsy on the tenth day of gestation for study and comparison with embryos from normal control pregnancies.Analysis of mitotic counts revealed that 18.6% of the cells in control embryos were in mitosis in contrast to only 5.7% in PGA-deficient embryos. A disproportionate reduction in anaphase and telophase stages was observed in conjunction with an increased percentage of cell at metaphase. Concomitantly with these mitotic changes a marked reduction in histochemically demonstrable RNA and in numbers of ribosomes as revealed by electron microscopy was observed.
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    Materialart: Digitale Medien
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  • 183
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 397-404 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A 79 year-old European female cadaver presented the usual features of second stage arrested mid-gut rotation accompanied by unusual mesenteric attachments and pancreatico-duodenal relationships.The mesentery, whose root extended from the lower pole of the right kidney diagonally across the posterior abdominal wall to end just medial to the left sacroiliac joint, enclosed most of the small bowel and the proximal large bowel. The unusually short duodenum began 2.5 cm to the left of the mid-line and described a 13 cm U loop with an upward concavity in which rested the pancreas; this loop and the related pancreas were enclosed in a persistent, transversely placed mesoduodenum. The common bile duct crossed the anterior surface of the pancreas to open at the greater duodenal papilla 2.5 cm from the pylorus. the main pancreatic duct lay much closer to the anterior than to the posterior aspect of the gland. The lesser duodenal papilla was situated on the posterior wall of the duodenum. The hepatic artery arose in common with the superior mesenteric artery and encircled the pancreas. The pancreatico-duodenal vessels were predominantly distributed upon the posterior aspect of the pancreas and duodenum.It appears that in this specimen the anterior and posterior aspects of the duodenum are transposed, the reversal of surfaces also involving the pancreas. Causative factors are discussed with reference to the literature.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 184
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A number of histologic and histochemical techniques have been used to study 42 human fetal thyroids from fresh specimens ranging in crown-rump length from 22 to 201 mm. Three periods of differentiation (colloid production) were defined. The first or precolloid stage was found in fetuses of 22 to 65 mm and consisted of strands of compact epithelial cells separated by loose connective tissue which contained only a few vessels. The early colloid production period from 65 to 80 mm was characterized by the appearance of small accumulations of colloid in the center of the follicles. The blood vessels between follicles increased during this period. In the last period during maturation of the colloid cavities, the spaces between the epithelium were more reduced and almost completely filled with blood vessels. No change in the average cell height was found during differentiation.With differentiation, the nuclei of epithelium became less compact and RNAase-removable cytoplasmic material increased. Also of interest was the marked decrease in glycogen at the time of colloid production.The staining characteristics of the early colloid showed little change during the period studied. The colloid was stained by the following reagents: periodic-acid Schiff, mercury organge, toluidine, ninhydrin-Schiff, Millon's and Sakaguchi's. The larger colloid spaces took slightly more toluidine stain than the smaller ones.The enzyme reaction for alkaline phosphatase was found only in the vascular system, and acid phosphatase was found in the cytoplasm of epithelium and, especially in the differentiated specimens, it was concentrated at the apex of the cell. Lactic and succinic dehydrogenase activity did not seem to change with maturation and was located in the cytoplasm around the nucleus and toward the apex of the cell.Thin rays of colloid-like material were observed to radiate out between cells from early colloid cavities. Based on unpublished electron microscopic data, organ cultures of human thyroid and observations from the developing chick, these spaces probably represent intercellular dilatations which have been filled with colloid from the central cavity. These spaces may be a secondary or safety mechanism which allows the circumference of the follicle to increase in size.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 185
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 186
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 11-24 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The topography of nasal glands in rats, guinea-pigs, rabbits, cats, and monkeys was studied in osmium tetroxide and PAS-stained whole mounts and ordinary sections. In rats Bowman's glands in the olfactory region were arranged in rows between the branches of the olfactory nerve. Mucous acini were only found on the rat septum in connection with Jacobson's organ, and serous acini were found on the septum posteriorly in the respiratory region, and on the lateral wall of the nasal cavity around the maxillary sinus ostium. No mixed glands were present. All the serous glands discharged their secretion through long excretory ducts into the ostium internum of the vestibule of the nose. In this area rats had 15-20 duct openings on each side. On the basis of considerations regarding airstream and pressure in the vestibule, the hypothesis is advanced that the openings act as small nozzles humidifying the inspired air by their atomized secretion. Since no serous or mucous glands in the rat open on the surface in the nasal cavity proper, it is concluded that the surface mucous sheet is derived exclusively from the goblet cells and Bowman's glands. In the other mammals the opening of the serous glands showed a similar pattern.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 187
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Four stocks (C, C-57 Bl, DBA and Swiss albino) of mice were fed a high-fat (28%), low-protein (8%), hypolipotropic diet for 3-480 days. Lipotropic activities of supplements of betaine and carnitine were evaluated. There were no strain-limited hepatic responses to the diet or to the action of the lipotropes. Without lipotropic supplements, parenchymal liposis (sudanophilia of frozen sections) was progressively incremental in all lobular zones for approximately 90 days. Subsquently, lobular liposis decreased and the remaining fat was concentrated in the middle zone within cords of fat-laden cells radiating in a stellate pattern. With choline supplemention, liposis was limited to small amounts of fat within cells that composed the stellate pattern. Betaine displayed a level of lipotropic activity approximating one-half to three-fourths that of choline. The lipotropic activity of carnitine was marginal and inconsistent. The combination of betaine and carnitine demonstrated some synergistic action. No parenchymal hyperplasia was observed. The intralobular reticulum increased in some livers, primarily around the central and intercalated veins, but no lobular distortion resulted.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 188
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 707-720 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: This study was based upon a dissection of the pelvic fasciae and associated structures of one hundred and three adult pelves as well as those of three full term fetuses. The perineal fasciae and their neural and vascular relationships were studied in an additional 55 specimens.The uterovaginal fascia, as stated by others, is a well-defined structure. One is usually able, on the basis of a fascial cleft, to distinguish readily between the fascial sheath of rectum proper and the deeper layer of subperitoneal fascia, called by some the presacral fascia. The latter is described, including the relationship of the pelvic autonomics thereto. The relationship of the vesical branches of the pelvic plexus and of the venous plexuses to the terminal ureter are also described.We were able to confirm the presence of a superficial and a deep perineal fascia; the latter forms the inferior boundary of the superficial perineal space proper, as described by others. The relationship of particular nerves (and vessels) to the fascial planes of the perineum follows a definite pattern even when variation from the normal is present.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 189
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Alterations in size and structure of submandibular and retrolingual glands of the rat produced by unilateral sectioning of the chorda tympani, or the lingual nerve, or the glandular branch which leaves the lingual and innervates both glands, are described. The glands were studied 1, 2, 4, 8, 12 and 16 days after nerve section.The weight of the glands increased the first day after nerve section and decreased markedly from then on, reaching 40 to 70% of the initial weight after 16 days. In the glands where the chorda tympani or the lingual nerve were sectioned the increase in weight was attributed to the accumulation of secretion in the acinous cells. After that, a progressive atrophy developed, being more severe in the acini than in the tubes. In the cases where the glandular nerve was sectioned a wide necrosis probably of vascular origin was produced, followed by parenchymatous regeneration.In both cases 16 days after nerve section glands were small, fibrous and with little parenchyma.The role of the parasympathetic nerves in controlling the normal structure of submandibulars and retrolinguals is discussed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 190
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 317-318 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: This article describes a rapid exposure of the facial nerve by splitting the parotid gland along the faciovenous plane originally described by Patey and Ranger ('57).Scissors are thrust deep into the gland along the venous plane, and then opened to expose the facial nerve. This has been done in approximately 30 dissecting room subjects.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 191
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The effects of hyper- and hypothyroidism on fetal development and on the postnatal maturation of the central nervous system was studied in the rat. Our observations indicated that the development of the rat fetus, as measured by birthweight and skeletal maturation of the newborn animal is not markedly influenced by presence or absence of thyroid hormone during the prenatal stage.Availability of thyroid hormone is a more critical factor with respect to maturation of the nervous system taking place in the postnatal animal.Delay in cerebellar maturation and delay in increase in dry weight of cerebrum and cerebellum were noted in hypothyroid rats. A transitory acceleration of oxygen consumption of these structures during their maturation was also noted in hyperthyroid litters.A more permanent suppression of learning behavior and of the thermoregulating mechanism was observed in young hypothyroid rats deprived of thyroid hormone since birth.It is concluded that requirements for thyroid hormone during development of the rat are limited to a critical period coinciding with the first two to three weeks of postnatal age.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 192
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 195-207 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Cholinesterase (ChE) distributions in the epithelial and smooth muscle cells and in the peripheral nervous plexus of the reproductive ducts of the male rat are dependent on male sex hormones. Castration results in establishment of a low maintenance level of apical enzyme activity in the epithelial cells; smooth muscles and the nerve plexus of the vas deferens and cauda epididymidis also show reduced enzyme reactions. Testosterone treatment restores the normal enzyme relations in the epithelium and smooth muscles. Estradiol is partially effective, but reaction intensities do not attain normal distrbutions and proportions. Reductions in relative numbers of ChE positive nerve plexus fibers and their enzyme reactivity, and recession to outer muscle layers occur in castrates, but better recoveries follow after testosterone than after estradiol treatments. The results are interpreted to be in agreement with other data relating to smooth muscle behavior and its neural and hormonal regulation. Epithelial cell differentiation is complete in testosterone treated castrates, but is incomplete in estradiol treated cases, although ChE synthesis and duct growth occurs in the latter.
    Materialart: Digitale Medien
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  • 193
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A comparative histological and histochemical study of the gastric mucosa was done with the frog, mouse, rat, hamster, guinea pig, rabbit, cat, dog and man. Enzymatic histochemical studies were done to demonstrate acid phosphatase (PbS and azo-dye methods), thiamine pyrophosphatase (TPP-ase) and NADH2 tetrazolium reductase activity. Cytoplasmic organelles were stained in some cases by three of the above methods i.e. acid phosphatase (PbS) activity marked the lysosomes, TPP-ase activity marked the Golgi apparatus and NADH2 tetrazolium reductase activity marked the mitochondria. The acid phosphatase activity of the four major cell types was markedly different in the various species. The activity shown by both methods in individuals of a given species coincided well except in the rabbit and the dog. TPP-ase activity demonstrated the Golgi region in the surface cells of all species except the guinea pig and the frog. The Golgi zones of zymogen cells showed strong activity only in the cat, while the parietal cell Golgi was not demonstrated in any of the species. NADH2 tetrazolium reductase activity in the parietal cells was strong in all animals except the mouse and the rat where staining was faint. The relationship between the lysosomes and the Golgi apparatus, as demonstrated histochemically in the gastric cells of the nine species, is discussed. The functional significance of these different enzymatic patterns has yet to be determined.
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    Materialart: Digitale Medien
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  • 194
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Adult rats, given intracardiac injections of strychnine (2.5 mg/kg), were allowed to convulse for periods of 5 or 35 minutes after which they were perfused with osmium tetroxide using a variation of Palay's method.Light and electron microscopic examinations revealed no discernible changes in the size of the soma or appearance of the nuclei or nucleoli of the neurons of the ventral horn. However, light microscopic studies showed that clustering of the basophilic content was not as well defined as in the control cells. The most conspicuous feature of the treated material was the presence of a peripheral network of clear spaces in the cytoplasm of many of the large neurons.An electron microscopic investigation showed that many neurons exhibited obvious and consistent cytoplasmic differences from control cells. These differences consisted of dilated endoplasmic spaces approximately 0.4 μ in diameter dispersed throughout the cytoplasm and devoid of material of appreciable density. The Golgi complex was more conspicuous and vesicles surrounding the complex appeared to be more numerous following the convulsive periods. These cytological changes were more extensive and prominent after 35 minutes than after five minutes. Mitochondria were comparable in appearance to those of control cells and vesicles of the axosomatic and axodendritic endings did not seem to differ structurally or numerically from those of control tissues.
    Materialart: Digitale Medien
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  • 195
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Cattle were injected with PMS, bred and slaughtered 3, 30, 45, 60 and 90 days after ovulation and the genital tracts dissected. From 30 to 90 days of pregnancy the percentage increase in the weight of single embryos was 85 times as much as the increase in crown-rump length. The volume of amniotic fluid increased 580 times in the second month of pregnancy and increased twice during the third month of pregnancy. The allantochorion did not lengthen between 60 and 90 days of pregnancy. At 30 days of pregnancy there was no significant difference in the crown-rump length or the weight of embryos of singles, twins, triplets, quadruplets or quintuplets. The volume of placental fluid per embryo was higher in singles than in twins and triplets; the volume of placental fluids per embryo decreased further in quadruplets and quintuplets. The weight of the placental membranes per embryo was heavier in singles than in twins, triplets and quadruplets; the weight of membranes was markedly decreased in quintuplets. The effects of overcrowding in utero on the conceptus was more pronounced at 60 days than at 30 days and in quintuplets than in triplets and quadruplets. Anastomosis of vascular supply of allantochorions occurred as early as 30 days of pregnancy.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 196
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 343-348 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Data were collected from a colony of 49 male and 55 female two-year-old Mongolian gerbils, Meriones unguiculatus (Milne-Edwards, 1867). This report gives tables which present data regarding linear measurements of body and organs and absolute and relative organ-weight data. The means, standard deviations, ranges, and coefficients of variation were summarized in the tables. Grossly observed pathological organs were omitted from the study. The tables give information about this species which could be helpful in future laboratory investigations where the body-and organ-weight ranges, variability and linear measurements of this species may be of practical value.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 197
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The organized cartilaginous fibrous system which appears during growth of the fracture callus in traumatized femora was investigated in mice of five, 52 and 78 weeks of age. Histological preparations were stained with toluidine blue O and observed under polarized light using a first order red retardation plate.Development and organization of the cartilaginous fibrous system was similar in animals of all age groups studied, however, its time of appearance was dependent upon the time of appearance of cartilage cells and in association with these cells. Alignment of cartilage cells followed very closely after appearance of the fibrous system. Initial orientation of the fibrous system was almost perpendicular to the bone surface. As the system became more extensive the slope of fiber direction became less acute, pointing towards the fractured end of the shaft. Orientation of the fibrous system is believed to be a consequence of the forces set up during growth of the fracture callus, e. g., the force of the growing cell mass due to postfracture, active cell proliferation of the osteogenic layer of the periosteum and hypertrophy of cartilage cells and the tension placed on the fibrous layer of the periosteum in response to the events taking place below this tissue layer. The importance of the cartilaginous fibrous system is believed to lie in the early temporary support of the fracture fragments and the proper alignment of the cellular elements of the fracture, necessary for proper architectural reconstruction. Formation of the cartilaginous fibrous system was independent of the existing periosteal fibrous system.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 198
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Studies of the ultrastructure of the seminiferous tubule of the Swiss mouse have shown the external limiting membrane to consist of internal and external lamellae enclosing a single layer of flattened cells. Both lamellae contain fibers, probably collagenous, running parallel to the long axis of the tubule. Superficially, a layer of connective tissue cells covers the external lamella. The nucleus of the Sertoli cell is typified by irregularity of size and shape, electron density of the nuclear membrane, and characteristic nucleolus. The cytoplasm contains mitochondria with vesicular cristae, and irregular dense bodies of possible secretory origin. Cytoplasmic processes extend between the germinal cells and in certain areas their surfaces are marked by periodic accumulations of fine granules which present a picture suggestive of desmosomes.Two types of spermatogonia have been noted. One possesses a large spherical nucleus containing finely granular nucleoplasm and scanty cytoplasm. The second is characterized by an ovoidal nucleus containing numerous chromatin clumps and scattered nucleolar fragments. Primary spermatocytes exhibit the intercellular bridges and synaptinemal complexes characteristic of these cells. The spherical nuclei contain densely packed fine granules. The nuclei of secondary spermatocytes often exhibit centrally located clumps of chromatin material. Mitochondria appear vacuolated at low magnifications but high magnification micrographs show them to contain finely membranous cristae.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 199
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The pattern of growth of bone and dentin was studied in serial decalcified sections by the use of lead markings. The experimental animals (monkeys and rabbits) received repeated intravenous injections of 4 mg lead acetate/kg body weight. The tissues were decalcified in 1% HCl through which H2S was constantly bubbled. Serial frozen sections were cut at 15-20 μ embedded in 10% gelatin and mounted in polyvinyl pyrollidone. They were placed in a 0.1% solution of gold chloride for ten minutes and then immersed for the same length of time in a 5% solution of sodium bisulphate in order to tone the background tissues. The sections were transferred to distilled water until the tissues became pink. When the desired toning was obtained they were fixed in 5% sodium thiosulphate. The examination of the sections obtained by this method confirmed the data obtained by other vital marking methods. However, much finer detail could be observed due to the sharpness of the lines and the use of relatively thin decalcified sections.
    Materialart: Digitale Medien
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  • 200
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 1-14 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In the testes of man and some other mammals a structure is formed during reproductive age, designated a “receptacle”. This structure which is not present during infancy represents the first communication of the seminiferous tubules to an extragonadal organ the rete “organ,” the receptacles received the mature spermatozoa which later are transported to the mesonephric excretory duct through the rete tubules. The receptacles are the distal end of the rete tubules and are considered as coelomic funnels.The epithelium of the receptacles, the tubuli recti and rete tubules is identical in infantile and mature testes and of a different type than the epithelium of the seminiferous tubules.The receptacle consists of a distal dilatation of the tubuli recti in which the seminiferous tubule invaginates following the ruptures of their walls. Identical receptacles are present in man, horse (Equus caballus), armadillo (Dasypus novemcinctus mexicanus), white-tailed deer (Odocoileus virginianus), dog (Canis familiaris), cat (Felix domesticus), hamster (mesocricetus auratus) and woodhuck (Marmota monax). In the mule (sterile offspring of a mare and a jackass) the receptacles lack communications.The presence of mature spermatozoa is believed to be the proper stimulus for the formation of the receptacles which established the communications between the seminiferous tubules and the rete tubules.The receptacles, tubuli recti and rete testis are part of an organ which accomplished the connection of the gonad to its mesonephric excretory system.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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