3,628 research outputs found
March Cress, Its Geography and Ecology in Iowa
Early in the spring of 1927 our attention was called to the prevalence of marsh cress in the state. This is not the first season that this weed has been so common. Apparently its appearance is more or less periodic or sporadic, depending upon weather conditions of the previous season
Influence of chemical treatment on polyphenoloxidase activity while related to colour changes of minimally processed ‘Jonagored’ apple
Characterisation of ‘Starking’ apple polyphenoloxidase
Experiments were performed to optimise the extraction conditions of
“StarkingÏ apple fruit polyphenoloxidase (PPO), to evaluate the affinity and speciÐcity
towards several substrates and to study the stability of enzyme extracts
from apple samples stored under di†erent conditions. Sodium phosphate bu†er
(0É2 M, pH 6É5) plus 0É25% Triton X and 1% or 2% PVPP was found to be the most efficient extraction mediu10m0. Chlorogenic acid, dopamine and 4-
methylcatechol showed similar speciÐcity towards PPO, and chlorogenic acid
was found to be the best substrate for the enzyme. Enzyme extracts from frozen
cut apple stored at [4¡C, and extracts from lyophilised apple samples stored at
4¡C were more stable than extracts obtained from fresh-cut or acetone powder
sample
Non-symplectic symmetries and bi-Hamiltonian structures of the rational Harmonic Oscillator
The existence of bi-Hamiltonian structures for the rational Harmonic
Oscillator (non-central harmonic oscillator with rational ratio of frequencies)
is analyzed by making use of the geometric theory of symmetries. We prove that
these additional structures are a consequence of the existence of dynamical
symmetries of non-symplectic (non-canonical) type. The associated recursion
operators are also obtained.Comment: 10 pages, submitted to J. Phys. A:Math. Ge
Neuraminidase Activity in \u3cem\u3eDiplococcus pneumoniae\u3c/em\u3e
Kelly, R. T. (Marquette University School of Medicine, Milwaukee, Wis.), D. Greiff, and S. Farmer. Neuraminidase activity in Diplococcus pneumoniae. J. Bacteriol. 91:601–603. 1966.—A method for the quantitation of neuraminidase in the presence of N-acetylneuraminic acid aldolase is described. The neuraminidase content of Diplococcus pneumoniae was found to be dependent on the media employed for growth; the highest enzyme activity per milligram of bacterial protein was obtained with Todd-Hewitt broth. Neuraminidase production was stimulated in D. pneumoniae by the addition of N-acetylneuraminlactose, N-acetylneuraminic acid, or N-acetylmannosamine to the growth medium. Three rough strains of D. pneumoniae, which were nonpathogenic for mice, lacked neuraminidase activity. Seven of 12 smooth strains contained neuraminidase; enzyme activity was not detected in the remaining 5 smooth strains. There was no correlation between the presence of neuraminidase activity and the capsular type or between neuraminidase production and animal virulence
Maximal superintegrability of Benenti systems
For a class of Hamiltonian systems naturally arising in the modern theory of
separation of variables, we establish their maximal superintegrability by
explicitly constructing the additional integrals of motion.Comment: 5 pages, LaTeX 2e, to appear in J. Phys. A: Math. Ge
Harnessing Semaphores Using Self-Learning Symmetries
Recent advances in compact symmetries and game-theoretic archetypes have paved the way for the World Wide Web. Even though it might seem unexpected, it fell in line with our expectations. Given the current status of certifiable modalities, theorists shockingly desire the simulation of erasure coding. In our research, we discover how neural networks [4, 5, 14] can be applied to the development of A* search
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