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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 13 (1965), S. 438-442 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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  • 2
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 6 (1967), S. 3519-3527 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 24 (1968), S. 685-688 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Freshly cleaved sodium chloride single crystals thermally etched both in air and in vacuum (10−5 torr) show three types of evaporation pit: concentric square pits and concentric circular pits in air etched crystals, and pyramidal pits in vacuum etched crystals. The pyramidal pits may be of three kinds: those with symmetric diagonals, those with one symmetric and one non-symmetric diagonal, and finally those with two non-symmetric diagonals. These pyramidal pits are of the same nature as those associated with dislocations, found on chemical etching of LiF crystals. The differences between pits produced in air and pits produced in vacuum are discussed in terms of surface fusion.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 24 (1968), S. 1177-1179 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto È studiato l'effetto di arrossamento provocato dall'aggiunta di alcuni zuccheri a colture sommerse dell'alga cloroficeaD. cinnabarinus. Questo effetto è dovuto alla formazione di cheto-carotenoidi, alla diminuzione delle clorofille ed alla degradazione dei cloroplasti. Le osservazioni al microscopio elettronico mettono in evidenza le variazioni della struttura dei cloroplasti.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 38 (1969), S. 367-372 
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Eine vergleichende Untersuchung war unternommen an einigen der chemischen Veränderungen, die während der Autolyse der Kulturen vonAspergillus flavus in physiologischen sauren und alkalischen Medien vorkommen. Die Myzelien vonA. flavus haben während der Autolyse 44 % ihres größten Trockengewichtes in physiologisch alkalischem Medium verloren, während dieser Verlust in physiologisch saurem Medium anscheinend Null gewesen ist. Stickstoff enthaltende Substanzen erschienen während der Autolyse weder in physiologisch saueren noch in alkalischen Medien beeinflußt zu sein. Das Verschwinden von P-enthaltenden Substanzen in Myzelien vonA. flavus in Autolyse unter beiden Bedingungen (NO 3 − und NH 4 + als Stickstoffquelle) erreichte 64 % in ‘alkalischer Autolyse’ und beinahe 77 % in der ‘saueren Autolyse’. Die Ergebnisse, die wir in der ‘saueren Autolyse’ erhalten haben legen es sehr nahe, daß autolytische Enzyme eine sehr geringe Aktivität in der Zeitspanne von 10–133 Tagen der Inkubazion zeigen, wenn die Autolyse an dem Verlust des mycelialen Trockengewichtes gemessen wird.
    Notes: Abstract A comparative study was done on some of the chemical changes occurring during autolysis of cultures ofAspergillus flavus in both physiologically acid and alkaline media. The mycelium ofA. flavus lost during autolysis 44 % of its maximum dry weight in the physiologically alkaline medium, whereas this loss was apparently nil in the physiologically acid medium. Nitrogen containing compounds seemed not to be affected by autolysis either in the physiologically acid or alkaline media. The disappearance of P-containing compounds in mycelium ofA. flavus autolysed in both conditions (NO 3 − and NH 4 + as N source) amounted to 64 % in the ‘alkaline autolysis’ and to nearly 77 % in the ‘acid autolysis’. The results we have obtained for the ‘acid autolysis’ strongly suggest that very little activity is shown by autolytic enzymes in the interval 10–133 days of incubation, when measuring autolysis by the loss in mycelial dry weight.
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  • 7
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In 244 Sektionen vom 2. Lebensjahr an aus den Jahren 1961, 1962 und 1963 wurde in 25% aller Fälle Histoplasmose in Form von Residualläsionen in Lungen und Lymphknoten gefunden. Diese Zahl entspricht genau dem Prozentsatz der Bevölkerung in unserer Gegend, die positiv auf Histoplasmin reagiert. Damit werden die Befunde vonStraub &Schwarz, die an Autopsien in Cincinnati, Ohio erhoben wurden, bestätigt. Neben der Histoplasminreaktion ist es auch mittels anatomischer Untersuchungen möglich, Aussagen über das Ausmass der Infektion mitHistoplasma capsulatum in einer bestimmten Gegend zu machen. Da bei den Untersuchungen in Cincinnati genauere Untersuchungsmethoden zur Anwendung kamen, ist es möglich, dass der Prozentsatz unserer positiven Fälle eher noch höher liegt. Die Zahl unserer Fälle mit multiplen residualen Histoplasmoseherden in den Lungen ist noch höher als in der ersten Untersuchungsserie vonStraub &Schwarz. Es könnte sich in einem Teil der Fälle durchaus um multiple Primärkomplexherde handeln. Anscheinend findet die Infektion mitH. capsulatum bei uns in früheren Lebensaltern statt. Die höchste Infektionsrate von fast 50% wurde in Personen aus den gegen den Maracaibosee zu gelegenen tropischen Gebieten gefunden. Sie war etwas geringer in den Gebirgstälern bis zu etwa 1000 m Höhe und gering in Gebieten grösserer Höhe.
    Abstract: Summary In 244 autopsies in patients from 2 years of age on, in 1961, 1962 and 1963 histoplasmic lesions were found in 25% of all cases, mostly residual foci in lungs and lymph nodes. This percentage is exactly the same as the percentage of histoplasmin sensitivity in our environment. Thus, the results ofStraub &Schwarz who found the same percentage of anatomic lesions and histoplasmin reactors in Cincinnati, Ohio, were confirmed in our material. Morphologic methods in autopsies are a valuable tool for epidemiologic investigations regarding histoplasmosis. Since a more exact technique of examination was applied in Cincinnati, it is probable that the positive percentage in our environment is even higher. A higher number of multiple residual histoplasmotic foci in the lungs was found in our series in comparison with the first material ofStraub &Schwarz. Multiple histoplasmic foci in some of these cases may be due to primary infection. Infection withH. capsulatum occurs apparently in our environment more frequently in younger persons. The highest infection rate of almost 50% was found in patients who lived in the tropical lowlands near the Lake of Maracaibo and the Panamerican Highway. A lower rate occurred in the mountain valleys up to approximately 3000 feet of altitude, and decreased even more in higher altitudes.
    Notes: Resumen En 244 autopsias de los años 1961, 1962 y 1963 de sujetos de más de 2 años de edad fué encontrado un 25% de casos con lesiones histoplasmóticas, en su gran mayoría de carácter residual, en pulmones y ganglios linfáticos. Esta cifra corresponde exactamente al porcentaje de reactores positivos a la prueba de histoplasmina en la población de nuestra región. Fueron corroborados los resultados deStraub &Schwarz, quienes en Cincinnati/Ohio encontraron la misma concomitancia entre los resultados de estos métodos de estudio, ambos igualmente valiosos para determinar el indice epidemiológico de histoplasmosis en una zona determinada. Puesto que en nuestros estudios no fueron aplicadas las mismas técnicas completas como en Cincinnati las cifras positivas en nuestro ambiente pueden eventualmente ser más altas, pero no alcanzan las cifras aún más elevadas, reportadas de otras zonas de Venezuela. En nuestro material el número de casos con lesiones histoplasmóticas antiguas múltiples en el pulmón, que sugieren ser primarios, era mayor que en la primera serie deStraub &Schwarz. Parece que entre nosotros la infección tiene lugar en períodos más tempranos de la vida que en EEUU de Norteamérica. El más alto índice de infección, de casi 50%, fué encontrado en personas provenientes de la región de la Cuenca del Lago de Maracaibo, disminuyendo algo en los valles de baja altura de las montañas y llegando a cifras bajas en los lugares de mayor altura.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 38 (1969), S. 199-207 
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary The induced autolysis ofAspergillus flavus mycelium was studied. Mycelium ofA. flavus was obtained by growing this fungus in submerged cultures with aeration and mechanical agitation in fermentors at 24° C–25° C for 6 days. At that time culture fluid was discarded and the mycelium throughout washed in sterile conditions and suspended in distilled water. The induced autolysis ofAspergillus flavus mycelium was provoked by subjecting this suspension to a combined action of a flow of air (4 l/min) and mechanical agitation (150 rev/min) for a variable length of time. In these conditions a degree of autolysis amounting to 73 %–79 % has been obtained. Estimation of ammonia evolved during this induced autolysis ofAspergillus flavus gave maximum values (10 mg/24 h/l of suspension) at the beginning of the process, that is, by the 4th–8th days of autolysis, decreasing sharply thereafter. From the 30th day on the amount of NH3 given off remained fairly constant around the value 1 mg/24 h/l of suspension.
    Notes: Resumen En la presente comunicación se estudia la autólisis inducida del micelio delAspergillus flavus. Se cultivó elA. flavus durante 6 dias en el medio de Raulin-Thom con aireación y agitación mecánica en fermentador a 24°–25°. Transcurrido este tiempo se lavó el micelio obtenido con agua en condiciones estériles hasta dejarlo exento de las últimas porciones de líquido de cultivo, prescindiendo de estas aguas de lavado. Finalmente se añadió un volumen de agua destilada estéril igual al de líquido de cultivo que había durante el crecimiento, al principio de la experiencia. La suspensión resultante se autolizó frente a agua sometiendola a la acción conjunta de un flujo de aire (4 l/min) y agitación mecánica (150 rev/min) igual que durante la fase de crecimiento. En esta autólisis inducida se obtuvo una pérdida de peso del micelio que ascendía a un 73 – 79%. El amoníaco desprendido durante la autólisis se determinaba diariamente, obteniéndose valores máximos que llegaron a 10 mg NH3/24 h/l de suspensión, durante el comienzo del proceso, esto es, entre el 40 y 80 dia de autólisis, seguidos de una brusca disminución para finalmente permanecer constante alrededor del valor 1 mg/24 h/l de suspensión a partir de los 30 dias de autólisis en adelante.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1031-1043 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies were carried out on the grafting of acrylonitrile (AN) and acrylamide (AA) to starch by ceric ion. The variables affecting the grafting of AN and AA were investigated with granular wheat starch dispersed in aqueous N,N-dimethylformamide and ceric ammonium nitrate as catalyst. Results showed that the concentrations of monomer and catalyst are the major factors influencing the grafting of AN; thus the monomer content of the grafts can be regulated by these variables. The grafting of AA is also influenced by these variables, but to a much less degree. Increasing concentrations of monomer promote homopolymerization and increasing concentration of catalyst inhibit grafting. The extent of grafting of this monomer can best be controlled by reaction time. Under the most favorable conditions, maximum grafting efficiency (ratio of amount of grafted monomer to total amount of monomer converted to polymer) was 87% for AN and 43.8% for AA. Although the monomer content of the AN grafts was higher than that of AA grafts prepared under identical conditions, the number of branches in the grafts was almost the same; only the length of the branches was different. The AN-starch grafts have branches of higher molecular weight.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 1969-09-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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