This publication explains the basic methodology used to size pumps for aquaculture systems; however, these concepts can be applied a variety of pumping systems. Written by Jordan Neff, J. A. Watson, and W. Porter, published UF/IFAS Department Agricultural Biological Engineering, September 2022.

We report the discovery of deuterium absorption in the very metal-poor ([Fe/H]=−2.88) damped Lyman-α system at zabs = 3.06726 toward the QSO SDSS J1358+6522. On the basis of 13 resolved D i absorption lines and the damping wings of the H i Lyman α transition, we have obtained a new, precise measure of the primordial abundance of deuterium. Furthermore, to bolster the present statistics of preci...

ABSTRACT The precision measurement of the primordial helium abundance Yp is a powerful probe early Universe. most common way to determine analyses observations metal-poor H ii regions found in blue compact dwarf galaxies. We present spectroscopic sample 100 collected from Sloan Digital Sky Survey. final analysed consists our and HeBCD data base Izotov et al. (2007). use self-consistent procedur...

In this paper we set bounds on the radiation content of the Universe and neutrino properties by using the WMAP-5 year CMB measurements complemented with most of the existing CMB and LSS data (WMAP5+All), imposing also self-consistent BBN constraints on the primordial helium abundance. We consider lepton asymmetric cosmological models parametrized by the neutrino degeneracy parameter ξν and the ...

Assays on cell-free homogenates of Acanthamoeba castellanii reveal that the three hydrolases, acid phosphatase (APase), acid deoxyribonuclease, and acid ribonuclease (RNase), possess pH optima of 5.0, 4.8, and 5.2, respectively. These enzymes exhibit an enhanced sedimentation at 20,000 x g when sucrose is in the homogenizing buffer. Treatment of homogenates with Triton X-100 increases total enz...

We establish a family of inequalities that allow one to estimate the Lq-norm matrix-valued field by an elliptic part and Lp-norm curl. This particularly extends previous work Neff et al. and, as main novelty, is applicable in regime p=1.

Encysting cells of Acanthamoeba castellanii, Neff strain, have been examined with the electron microscope. The wall structure and cytoplasmic changes during encystment are described. The cyst wall is composed of two major layers: a laminar, fibrous exocyst with a variable amount of matrix material, and an endocyst of fine fibrils in a granular matrix. The two layers are normally separated by a ...

A method is described for the rapid and efficient isolation of phagocytic vesicles from large scale cultures of Acanthamoeba castellanii (Neff) that have been incubated with polystyrene latex beads. Cells were allowed to phagocytose latex beads for 30 min and then were homogenized, and the phagocytic vesicles were isolated by one centrifugation through several layers of sucrose. Identity and pu...