1,761 research outputs found
A Comparison of the bacterial flora of surface and sub-surface water of the sea off Ceylon
Under stable conditions of stratification of the sea, evidence of generic differences of the associated bacterial flora of the water masses has been obtained, between surface and sub-surface water. Gram negative rods, especially pseudomonads and achromobacters were more frequent at the surface. The fermentative and oxidase negative flora was more frequent in sub-surface water. The surface water in general had a greater variety of bacterial types while the sub-surface water had a flora with a greater range of biochemical activity. These results are discussed in relation to the hydrological condition of the water masses and the bacterial flora of freshly caught fish
Survival of Staphylococci on frozen fish
Using Staphylococcus aureus as the test culture it has been shown that cell injury occurs in two phases during freezing and storage at temperatures below freezing. Certain constituents of fish muscle appear to protect the cells during both phases of injury. The survival of bacteria on fish muscle is not influenced by the rate at which the fish muscle was frozen prior to inoculation. There was no significant difference between growth of bacteria on quick frozen and slow frozen fish muscle after thawing. However there appeared to be a slight tendency for the lag phase of growth to be extended on thawed quick frozen fish muscle when compared with thawed slow frozen muscle
Marine bacteria as indicators of upwelling in the Sea
The âoxidase reactionâ (using p-amino-dimethyl-aniline oxalate as the reagent) has been used to distinguish oxidase-negative from oxidase-positive bacteria from the sea, when grown on membrane filters. By this means, it has been shown (a) that under conditions of stable stratification of the sea as in the tropics, a relationship exists between the percentage incidence of oxidase negative bacteria in the flora and the depth of the water; (b) that the maximum value for this percentage incidence (100) is reached at or immediately below the upper limit of the oxygen minimum layer; (c) that this percentage value (expressed as Oxâżvalues) may be used to demonstrate the movements of water masses during upwelling. Such upwelling as indicated by theoretical findings and by temperature determinations along two transects off the west coast of Ceylon during the north east monsoon, has been confirmed by the distribution of Oxâżvalues at these transects
A model for net-baryon rapidity distribution
In nuclear collisions, a sizable fraction of the available energy is carried
away by baryons. As the baryon number is conserved, the net-baryon
retains information on the energy-momentum carried by the incoming nuclei. A
simple and consistent model for net-baryon production in high energy
proton-proton and nucleus-nucleus collisions is presented. The basic
ingredients of the model are valence string formation based on standard PDFs
with QCD evolution and string fragmentation via the Schwinger mechanism. The
results of the model are presented and compared with data at different
centre-of-mass energies and centralities, as well as with existing models.
These results show that a good description of the main features of net-baryon
data is possible in the framework of a simplistic model, with the advantage of
making the fundamental production mechanisms manifest.Comment: 9 pages, 12 figures; in fig. 11 a) the vertical scale was correcte
Monitoring Online Operating Fuel Management System
Online fuel station management system makes it easy to manage their work systematically. We used the mern stack to develop this system. In this web application admin can log in to the system and manage functions like employee management, fuel management, order management, inventory management, weekly fuel queue management, supply fuel management, payment management, and vehicle management. Only the admin can log in to the system. Admin can add employee profiles, and employee can see their profile. Also, the user can create a fuel pass and log in to the fuel pass page. Users can see relevant fuel passes and qr codes. They can download and print fuel passes, and users can see how many fuel liters they can get. Users can also order special fuel orders and see order status. In vehicle management, the admin can manage vehicles. Also, the user can see fuel details and new prices. Admin manages inventory and storage of fuel tanks. Also, admin and user are very easy to use in this system
eta-^4He Bound States in the Skyrme Model
The rational map ansatz for light nuclei in the Skyrme model is shown to
imply the existence of an \eta-^4He bound state, with a binding energy of ~ 30
KeV.Comment: 5 page
Global well-posedness for a nonlocal Gross-Pitaevskii equation with non-zero condition at infinity
We study the Gross-Pitaevskii equation involving a nonlocal interaction
potential. Our aim is to give sufficient conditions that cover a variety of
nonlocal interactions such that the associated Cauchy problem is globally
well-posed with non-zero boundary condition at infinity, in any dimension. We
focus on even potentials that are positive definite or positive tempered
distributions.Comment: Communications in Partial Differential Equations (2010
Nuclear shadowing in Glauber-Gribov theory with Q2-evolution
We consider deep inelastic scattering off nuclei in the Regge limit within
the Glauber-Gribov model. Using unitarized parton distribution functions for
the proton, we find sizeable shadowing effects on the nuclear total and
longitudinal structure functions, and , in the low-x limit.
Extending a fan-diagram analysis for the large-mass region of coherent
diffraction off nuclei to high Q2, we also find significant shadowing effects
in this kinematical regime. Finally, we discuss shortcomings of our approach
and possible extensions of the model to other kinematical regimes.Comment: 16 pages, 9 figure
Universal pattern in (e,e'p) at large missing momenta: quasi-deuteron or diffractive final state interactions?
The intrinsic single particle momentum distributions in nuclei are supposed
to show a universal behavior at large momenta, dominated by short-range
correlated pairs, or quasi-deuterons. We discuss whether the quasi-deuteron
universality survives the final state interaction effects, which are present in
the missing momentum spectra measured in experiments at GeV
energies. We demonstrate that in the observed missing momentum spectra an
approximate universality is present, but originating from the universal pattern
of diffractive final state interactions of the struck proton independent of the
target nucleus.Comment: 10 pages, Latex, 3 uuencoded figure
- âŠ