156,850 research outputs found
Spartan Daily, October 19, 1990
Volume 95, Issue 36https://scholarworks.sjsu.edu/spartandaily/8035/thumbnail.jp
Spartan Daily, November 2, 1992
Volume 99, Issue 46https://scholarworks.sjsu.edu/spartandaily/8330/thumbnail.jp
Spartan Daily, August 20, 2015
Volume 145, Issue 1https://scholarworks.sjsu.edu/spartandaily/8208/thumbnail.jp
Role of antioxidant supplementation and exercise regimen in handling oxidative stress from natural PM2.5 exposure due to boreal forest fire
Thesis (M.S.) University of Alaska Fairbanks, 2019Particulate matter 2.5 (PM2.5) exposure induces oxidative stress that causes many negative health outcomes such as cancer, cardiovascular disease and neurodegenerative disease. Research shows that dietary antioxidants and an up-regulated endogenous antioxidant response from exercise play key roles in the antioxidant defense against oxidative stress. This study is the first to use an animal model to investigate the cumulative effects of using lifestyle interventions of antioxidant supplementation (Arthrospira platensis) and exercise regimen on the antioxidant response before, during, and after ambient PM2.5 exposure. In a two-factorial, longitudinal design, sled dogs (n=48) were divided into four groups (exercise and supplemented, exercise, supplemented, and control) to (1) test the effects of exercise and antioxidant regimen on antioxidant response after one month of implemented exercise and supplementation protocol and (2) measure the antioxidant response of all groups during and after a natural forest fire event in 2015. Commercial assays for Total antioxidant Power (TAP) and the enzymatic antioxidant Superoxide Dismutase (SOD) were used as markers for the total antioxidant response and the endogenous response at all time points. During the forest fire, SOD was increased 5-10-fold over pre/post-exposure levels in all groups suggesting potential implication for using SOD as a marker for the acute response to environmental stress. TAP was increased in the exercise groups after one month of exercise protocol implementation, demonstrating the cytoprotective increase of antioxidants after repeated exercise.Chapter 1: Introduction -- 1.1 PM2.5 -- 1.2 Oxidative stress and exercise -- 1.3 Antioxidants -- 1.4 Significance and research hypothesis -- Chapter 2 The effects of spirulina supplementation and exercise regimen on the antioxidant response to PM2.5 exposure in sled dogs -- 2.1 Introduction -- 2.2 Materials and methods -- 2.2.1 Animals -- 2.2.2 Experimental design -- 2.2.4 Exercise -- 2.2.5 Blood sampling -- 2.2.6 Biochemical analyses -- 2.2.7 Statistics -- 2.3 Results -- 2.4 Discussion -- 2.5 Conclusions -- Chapter 3 Conclusions and future directions -- References
Spartan Daily, November 19, 2007
Volume 129, Issue 45https://scholarworks.sjsu.edu/spartandaily/10417/thumbnail.jp
Effects of an on line bypass oil recycler on emissions with oil age for a bus using in service testing
A method of cleaning lubricating oil on line was
investigated using a fine bypass particulate filter
followed by an infra red heater. Two bypass filter
sizes of 6 and 1 micron were investigated, both filter
sizes were effective but the one micron filter had the
greatest benefit. This was tested on two nominally
identical EURO 2 emissions compliance single
decker buses, fitted with Cummins 6 cylinder 8.3 litre
turbocharged intercooled engines and coded as Bus
4063 and 4070. These vehicles had emissions
characteristics that were significantly different, in
spite of their similar age and total mileage. Bus 4063
showed an apparent deterioration on emissions with
time while Bus 4070 showed a stabilised trend on
emissions with time for their baseline tests without
the recycler fitted. Comparison was made with the
emissions on the same vehicles and engines with
and without the on-line bypass oil recycler. Engine
exhaust emissions were measured about every 2000
miles. All tests started with an oil drain and fresh
lubricating oil. The two buses were tested in a
different sequence, Bus 4063 with the recycler fitted
and then removed later in the test after an oil change
and Bus 4070 with no recycler fitted at first and then
fitted after 29,000 miles with no oil change. The Bus
4070 was also the one with the finer bypass filter.
The test mileage was 45,000 miles for Bus 4063 and
48,000 miles for Bus 4070. The air/fuel ratio was
worked out by the exhaust gas analysis. The
correlation between air/fuel ratio and emission
parameters was determined. The results showed that
the on line oil recycler cleaning system reduced the
rate of increase of the NOx from 5% to 1.6% for Bus
4063 and from 4.1% to 0% for Bus 4070 per 10,000
miles. Hydrocarbon emissions increased 30 ppm per
10,000 miles with the recycler removed compared to
a stabilised level with the recycler fitted for Bus 4063.
There was a small decrease in hydrocarbon
emissions after fitting the recycler for Bus 4070. The
particulate emissions were reduced by 35% for Bus
4063 and 24% for Bus 4070 on average. The
reductions on total particulate mass were due to
reductions on particulate carbon and lube oil VOF
emissions. The black smoke was reduced by 56% for
Bus 4063 in terms of rate of increase and 40% for
Bus 4070 in terms of average value
Toward an mHealth Intervention for Smoking Cessation
The prevalence of tobacco dependence in the United States (US) remains alarming. Invariably, smoke-related health problems are the leading preventable causes of death in the US. Research has shown that a culturally tailored cessation counseling program can help reduce smoking and other tobacco usage. In this paper, we present a mobile health (mHealth) solution that leverages the Short Message Service (SMS) or text messaging feature of mobile devices to motivate behavior change among tobacco users. Our approach implements the Theory of Planned Behavior (TPB) and a phase-based framework. We make contributions to improving previous mHealth intervention approaches by delivering personalized and evidence-based motivational SMS messages to participants. Our proposed solution implements machine learning algorithms that take the participant\u27s demographic profile and previous smoking behavior into account. We discuss our preliminary evaluation of the system against a couple of pseudo-scenarios and our observation of the system\u27s performance
TVOCs and PM 2.5 in Naturally Ventilated Homes: Three Case Studies in a Mild Climate
In southern Europe, the present stock of social housing is ventilated naturally, with practice
varying in the di erent seasons of the year. In winter, windows are kept closed most of the day
with the exception of short periods for ventilation, whereas the rest of the year the windows are
almost permanently open. In cold weather, air changes depend primarily on the air infiltrating
across the envelope and when the temperature is warm, on the air flowing in through open windows.
CO2, PM2.5, and TVOC concentration patterns were gathered over a year’s time in three social
housing developments in southern Europe with di erent airtightness conditions and analyzed to
determine possible relationships between environmental parameters and occupants’ use profiles.
Correlations were found between TVOC and CO2 concentrations, for human activity was identified
as the primary source of indoor contaminants: peak TVOC concentrations were related to specific
household activities such as cooking or leisure. Indoor and outdoor PM2.5 concentrations were
likewise observed to be correlated, although not linearly due to the presence of indoor sources.
Ventilation as presently practiced in winter appears to be insufficient to dilute indoor contaminants in
all three buildings, nor does summertime behavior guarantee air quality
Spartan Daily, September 3, 1993
Volume 101, Issue 6https://scholarworks.sjsu.edu/spartandaily/8434/thumbnail.jp
Spartan Daily, December 5, 2013
Volume 141, Issue 41https://scholarworks.sjsu.edu/spartandaily/1460/thumbnail.jp
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