Comparison of Partner Assisted PNF Stretching and Strap Assisted PNF Stretching

Purpose: There are many studies comparing different methods of PNF stretching to each other and static stretching, but there are few studies comparing the use of a strap with PNF stretching. The lack of studies comparing unassisted strap PNF stretching to assisted PNF stretching for chronic increases in hamstring flexibility creates challenges in determining if using a strap is practical to recommend. Benefits of the strap include making PNF stretching more accessible to those who don’t have someone to assist them with PNF stretching, especially at home. Methods: The study involved students who attend the University of North Florida and they were broken up into an exercise professional assisted (EPA) PNF stretching (n = 6) and a strap assisted (SA) PNF stretching group (n = 9). The groups stretched four times per week for four week and joint range of motion (ROM) was assessed at the beginning, and end of the study. A t-test was utilized to determine if differences between groups as a result of the intervention. Results: There was no difference in change in hamstring ROM from the pre-test measurements to the post-test measurements within or between groups. Conclusion: These findings are inconsistent with previous research that has shown increases in hamstring ROM when doing assisted PNF stretching. These inconsistencies could be from subject sample pool (young physically active students), inter-rater reliability (2 exercise science students and one PT student), and assessment time of day (varied based on subject availability)

PRIMUS: The relationship between Star formation and AGN accretion

We study the evidence for a connection between active galactic nuclei (AGN) fueling and star formation by investigating the relationship between the X-ray luminosities of AGN and the star formation rates (SFRs) of their host galaxies. We identify a sample of 309 AGN with $10^{41}<L_\mathrm{X}<10^{44}$ erg s$^{-1}$ at $0.2 < z < 1.2$ in the PRIMUS redshift survey. We find AGN in galaxies with a wide range of SFR at a given $L_X$. We do not find a significant correlation between SFR and the observed instantaneous $L_X$ for star forming AGN host galaxies. However, there is a weak but significant correlation between the mean $L_\mathrm{X}$ and SFR of detected AGN in star forming galaxies, which likely reflects that $L_\mathrm{X}$ varies on shorter timescales than SFR. We find no correlation between stellar mass and $L_\mathrm{X}$ within the AGN population. Within both populations of star forming and quiescent galaxies, we find a similar power-law distribution in the probability of hosting an AGN as a function of specific accretion rate. Furthermore, at a given stellar mass, we find a star forming galaxy $\sim2-3$ more likely than a quiescent galaxy to host an AGN of a given specific accretion rate. The probability of a galaxy hosting an AGN is constant across the main sequence of star formation. These results indicate that there is an underlying connection between star formation and the presence of AGN, but AGN are often hosted by quiescent galaxies

Precooling Methods For Commercial Vegetable Producers

Horticultural product deterioration\u27\u27after harvest is caused by respiration, \u27a complex process which at higher temperatures causes\u27faster \u27 decay of the product. Vegetable products vary in their rate of respira tion; but for most \u27products,\u27 good cooling\u27is critical to retard physiolog ical deterioration\u27 and maintain shelf life \u27and quality [9,\u27p.\u27 35]\u27.\u2

PRIMUS: The Effect of Physical Scale on the Luminosity-Dependence of Galaxy Clustering via Cross-Correlations

We report small-scale clustering measurements from the PRIMUS spectroscopic redshift survey as a function of color and luminosity. We measure the real-space cross-correlations between 62,106 primary galaxies with PRIMUS redshifts and a tracer population of 545,000 photometric galaxies over redshifts from z=0.2 to z=1. We separately fit a power-law model in redshift and luminosity to each of three independent color-selected samples of galaxies. We report clustering amplitudes at fiducial values of z=0.5 and L=1.5 L*. The clustering of the red galaxies is ~3 times as strong as that of the blue galaxies and ~1.5 as strong as that of the green galaxies. We also find that the luminosity dependence of the clustering is strongly dependent on physical scale, with greater luminosity dependence being found between r=0.0625 Mpc/h and r=0.25 Mpc/h, compared to the r=0.5 Mpc/h to r=2 Mpc/h range. Moreover, over a range of two orders of magnitude in luminosity, a single power-law fit to the luminosity dependence is not sufficient to explain the increase in clustering at both the bright and faint ends at the smaller scales. We argue that luminosity-dependent clustering at small scales is a necessary component of galaxy-halo occupation models for blue, star-forming galaxies as well as for red, quenched galaxies.Comment: 13 pages, 6 figures, 5 tables; published in ApJ (revised to match published version

New views on price-making markets and the capitalist impulse: beyond Polanyi

Anthropologists have persistently diminished the importance of the market and marketplace exchange in premodern, preindustrial times. This strident anti-market mentality, derived largely from the writings of Karl Polanyi, underpins an ideological and politicized argument that neither sets useful guideposts to advance anthropological research, nor does it yield the necessary insights or empirically valid foundations to comprehend the deep historical origins of modern economies or polities. In fact, by envisioning the past that is categorically caged from the modern, the school of thought crystalized through Polanyi's perspectives circumvents the role of diachronic processes that are at the heart of a truly historical social science. Although it is not our principal aim to relitigate the vast literature pertaining to the rise and fall of Polanyian thought, our approach expands on prior arguments about his project both by highlighting critical perspectives on capitalism that long predated Polanyian thought and by identifying a veritable bounty of new evidence and theory concerning premodern and contemporary marketplace economies that enable us to transcend these now-entrenched claims. The scheme we present that distinguishes between open and competitive marketplaces, on the one hand, and the capitalist impulse, on the other, we believe, adds depth and breadth to the analysis of price-making markets and their divergent social and economic outcomes across time and space