... Baeyer, Hahn, and Meitner have shown that the β -radiation from a substance can usually be resolved ... approximate value of the charge carried by the β -particles from radium it is clear that each atom in disintegrating cannot emit one β -particle of each kind, and it is therefore ... investigation was undertaken to determine the number of β -particles emitted by radium C. This work has ... best methods of measuring accurately the number of β -particles from an atom, with the intention of ... or radium C emits slightly more than one β -particle, while radium E appears to emit on ...
Tópico(s): Radioactive Decay and Measurement Techniques
1912 - Royal Society | Proceedings of the Royal Society of London Series A Containing Papers of a Mathematical and Physical Character
... them. We might, therefore, expect that when the β -rays from radioactive substances impinge on a plate, ... γ -rays, is almost invariably associated with the β -rays, but it has generally been thought that ... rays are due to the expulsion of the β -ray from the radioactive atom. In some cases ... are certainly not due to the impact of β -rays on external objects, the γ -rays of ... mask the possible production of γ -rays by β -rays as the experiments of H. Starke show. Starke attempted to find whether β -rays did produce γ -rays. He used for ...
Tópico(s): Radioactive Decay and Measurement Techniques
1911 - Royal Society | Proceedings of the Royal Society of London Series A Containing Papers of a Mathematical and Physical Character
... various recombinant Toxoplasma gondii expressing the heterologous Ag β-galactosidase (β-gal) and studied whether 1) secreted or cytoplasmic ... cells. We monitored the frequencies and kinetics of β-gal-specific CD8 T cells in infected mice ... infection of B6C (H-2 bxd ) mice, only β-gal-secreting tachyzoites induced β-gal-specific CD8 T cells. However, upon secondary ... had received a primary infection with tachyzoites secreting β-gal, β-gal-secreting tachyzoites and bradyzoites transiently increased the frequency of intracerebral β-gal-specific CD8 T cells. Frequencies of splenic ...
Tópico(s): Neuroinflammation and Neurodegeneration Mechanisms
1950 - BMJ | Journal of Neurology Neurosurgery & Psychiatry
Abstract Die folgenden β‐Phenyläthylamine wurden aus den entsprechenden β‐Nitrosyrolen durch Reduktion mit LiAlH 4 gewonnen: 3,4,5‐Trimethoxy ‐ β ‐ phenyläthylamin, 2,3,4 ‐ Trimethoxy ‐ β ‐ phenyläthylamin, DL ‐α‐Methyl ‐ β‐phenyläthylamin, 3,4‐Methylendioxy ‐ β ‐ phenyäthylamin und 3,4‐Methylendioxy‐5‐brom ‐ β ‐ phenyläthylamin. Diese einfache Methode zur Darstellung von β‐Phenyläthylaminen ist den bisher bekannten überlegen und gibt ... Darstellung des unbekannten 3,4‐Methylendioxy‐5‐brom ‐ β ‐ phenyläthylamins konnte gezeigt werden, dass je nach den ...
Tópico(s): Asymmetric Synthesis and Catalysis
1950 - Wiley | Helvetica Chimica Acta
Jacques Monod, Germaine Cohen-Bazire, Melvin Cohn,
1. La formation de la β-galactosidase chez E. coli est induite exclusivement par des substances possédant un radical galactosidique intact. Diverses inversions ou substitutions en une ... qu'ils ne soient pas hydrolysés par la β-galactosidase. 3. L'inductivité est, d'une manière ... thiogalactoside) doués d'une haute affinité pour la β-galactosidase in vitro comme in vivo sont dépourvus ... la propriété inductrice. 4. La formation de la β-galactosidase est inhibée par le phényl-β-D-thiogalactoside, mais cette inhibition est non compétitive ...
Tópico(s): Enzyme Structure and Function
1951 - Elsevier BV | Biochimica et Biophysica Acta
... séparé par chromatographie en deux acides (α et β) qui sont probablement des isomères. 2. L'analyse ... que l'hydroxyle des acides mycoliques est en β par rapport au carboxyle. 4. Les acides mycoliques ... explication. C'est une réaction caractéristique des acides β-hydroxylés, ramifiés en α. 5. Nous définissons les ... souches de Mycobactéries examinées jusqu'iici comme acides β-hydroxylés à haut poids moléculaire portant une longue ... separated by chromatography into two acids (α and β) which are probably isomers. 2. The elementary analysis ...
Tópico(s): Carbohydrate Chemistry and Synthesis
1951 - Elsevier BV | Biochimica et Biophysica Acta
R. U. Lemieux, Jacques Giguere,
The phytochemical reduction of the β-keto-n-caproic and β-keto-n-caprylic acids yielded the corresponding D-β-hydroxyacids. This observation is contrasted to bioreduction of β-ketobutyric acid to L-β-hydroxybutyric acid. The basis for the assignment of ... was obtained through the Curtius degradation of D-β-hydroxy -n-caprohydrazide. The configurations assigned to the β-hydroxy-n-caprylic acids are based on the ... for the optical rotations of homologous compounds. The β-hydroxy-n-caproic and β-hydroxy-n-caprylic ...
Tópico(s): Enzyme Catalysis and Immobilization
1951 - NRC Research Press | Canadian Journal of Chemistry
Project Gutenberg
Emil Buchta, Maria Klisch, S. Maier, Helmut Bayer,
... substituierter 6-Methoxy-tetralon-(1)-Derivate und von β-[6-Methoxy-3,4-dihydro-naphthyl-(1)]-und β-[6-Methoxy-naphthyl-(1)]-äthylalkohol Emil Buchta, Emil ... abgeschlossen Mitte November 1949, beschrieben. Die Synthese des β-[6-Methoxy-3,4-dihydro-naphthyl-(1)]- und β-[6-Methoxy-naphthyl-(1)]-äthylalkohols ist ein Teil ... abgeschlossen Mitte November 1949, beschrieben. Die Synthese des β-[6-Methoxy-3,4-dihydro-naphthyl-(1)]- und β-[6-Methoxy-naphthyl-(1)]-äthylalkohols ist ein Teil ... abgeschlossen Mitte November 1949, beschrieben. Die Synthese des β-[6-Methoxy-3,4-dihydro-naphthyl-(1)]- und ...
Tópico(s): Steroid Chemistry and Biochemistry
1952 - Wiley | Justus Liebig s Annalen der Chemie
... directed towards an understanding of the mechanism of β‐oxidation of fatty acids may be divided into ... enzyme systems. 2. The Knoop‐Dakin theory of β‐oxidation could not be directly confirmed owing to ... short‐chain fatty acids; and ( d ) cleavage of β‐ketoacyl CoA's by CoA with formation of ... acyl CoA's to their corresponding trans α, β‐unsaturated derivatives. The first is a green dehydrogenase ... CoA hydrase catalyses the hydration of trans α, β‐ or β, γ‐unsaturated CoA's to their corresponding l (+)‐β‐hydroxyacyl CoA derivatives. The enzyme acts upon all ...
Tópico(s): Biochemical Acid Research Studies
1954 - Wiley | Biological reviews/Biological reviews of the Cambridge Philosophical Society
... modified values of the Chalmers and Martius parameter β—the ratio of the Burgers vector to the ... slip process. It is shown that the modified β-values are in good agreement with the general ... systems correspond to the next lowest value of β. Thus, it is concluded that the alternate {110} ... On a déterminé des valeurs modifiées du parametre β de Chalmers et Martius, c'est-à-dire ... Il est montré que les valeurs modifiées de β sont en bon accord avec la théorie de ... systèmes additionnels de glissement correspondent aux valeurs de β se rapprochant le plus de la valeur de ...
Tópico(s): Surface and Thin Film Phenomena
1954 - University of Toronto Press | Acta Metallurgica
A.J. Williams, R.W. Cahn, C. S. Barrett,
... specimens, which had originally been single crystals of β-phase. The orientation relationship was close to but not quite identical with the Burgers relationship: (0001)β | | {110}β; {H20}α || {lll}β; the deviations were 12−1°. The habit plane ... qui étaient initialement des monocristaux de la phase β. La relation d'orientation était proche de la relation de Burgers (0001)α ∥ {110}β; {1120}α ∥ {lll}β; l'écart était de 12−1°. Le plan ... natürlichen Fazetten von Proben, die ursprünglich Einkristalle der β-Phase gewesen waren, untersucht. Die Beziehung der kristallographischen ...
Tópico(s): Welding Techniques and Residual Stresses
1954 - University of Toronto Press | Acta Metallurgica
National Library of Medicine (NCBI)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntispasmodics. XV. β-Diethylaminoethyl Esters of β,β-Diphenylglycidic, β,β-Diphenyllactic and β,β-Diphenylglyceric AcidsF. F. Blicke and J. A. FaustCite this: ...
Tópico(s): Asymmetric Synthesis and Catalysis
1954 - American Chemical Society | Journal of the American Chemical Society
The resistivity of a series of β-phase niobium-titanium alloys has been measured over the temperature range 88°K to 1173°K. The form of the resistivity-temperature- ... in the temperature coefficient of resistance until, in β-phase alloys containing less than 25 at.% niobium, ... temperature coefficient of resistivity becomes negative. Although the β-phase in alloys containing less than 20 at.% ... of the isothermal resistivity-concentration curves for the β solid-solution to zero niobium content seems to indicate that pure β-titanium would show a semiconducting type of behaviour ...
Tópico(s): Microstructure and Mechanical Properties of Steels
1954 - University of Toronto Press | Acta Metallurgica
I. A. Preece, R. A. Aitken, John A. G. Dick,
... contains a system of enzymes capable of degrading β-glucosan to glucose, the stages involved including: (a) endo-β-glucosanase action, causing sharp decrease in solution viscosity ... any large development of reducing groups; (b) exo-β-glucosanase action, liberating substantial amounts of glucose and, ... or whether it is also formed directly from β-glucosan and its high-molecular degradation products, remains ... activity, but one of wheat showed little exo-β-glucosanase. Oats, which had a strong endo-activity, ...
Tópico(s): Food composition and properties
1954 - Wiley | Journal of the Institute of Brewing
... 1. aa·(1-a)1-a·ββ/(1+β)1+β which reduces to the correspounding value of K for serum if β = 0. 6.The clinical significance of K in ... we find the indices a = 0.59 and β = 0.068 approximately; and the equation 1. Ra+β·S/[R+S(1+R)] 1+β = K where K varies, in our experimental series, ... 1. aa·(1-a)1-a·ββ/(1+β)1+β qui correspond à la valeur de Kdu sérum, si β = 0. 6. Discussion de la signification médicale de ... dessus, on obtient approximativement : a = 0.59 et β = 0.068 et l'equation : 1. Ra+β· ...
Tópico(s): Hemoglobin structure and function
1947 - Elsevier BV | Analytica Chimica Acta
The β-galactosidase of alfalfa seed emulsin is, as first found by Hill1, unable to catalyse the hydrolysis of β-glucosides and must, consequently, be regarded as different from β-glucosidase. A closer study has shown that it differs from the β-galactosidase of almond emulsin with regard to the pH-optimum and affinity to β-galactosides, galactose and aglucone, e.g., o-cresol. It is discussed if differences between two β-glycosidases means differences between their prostetic groups or ... groups and colloidal carriers have been found. La β-galactosidase de l'émulsine des graines d'alfalfa ...
Tópico(s): Food Chemistry and Fat Analysis
1947 - Elsevier BV | Biochimica et Biophysica Acta
... that potato amylose is incompletely hydrolyzed with pure β-amylase unless another factor (Z-enzyme) is added ... dextrin, obtained after hydrolysis of the amylose with β-amylase, has an effect similar to treatment with ... the residual dextrin to be further hydrolyzed with β-amylase. 3. The exact degree of β-amylolysis depends on the plant material from which ... glucose 1-phosphate is not completely hydrolyzed by β-amylase. However, its limit of hydrolysis is considerably ... Z-enzyme activity could be removed from the β-glucosidase and laminarase activities in almonds by purification, ...
Tópico(s): Biofuel production and bioconversion
1955 - Elsevier BV | Archives of Biochemistry and Biophysics