Thesis-Halle-Wittenberg. / Cover title. Vita. "Le Siege d'Orange; Text einer Fortsetzung der Prise d'Orange, die sich in der Berner Handschrift findet." p. 2-20. Includes bibliographical references (p. [59]).

Hypoxia occurs when the dissolved oxygen concentrations in water fall below 2 mg/L, and negative impacts to flora and fauna can result. In this study, sediment core and water column measurements were collected and processed through several laboratory and field methods to better understand the biogeochemistry of Weeks Bay (WB), AL. Results show that salinity, temperature, and dissolved oxygen fluctuate on a diurnal cycle. Results also show a significant difference in water column and sediments between different years and sites. The western side of WB was found to more likely to go hypoxic than other portions. Conclusions of this research include that major differences in the water column are shown during a diurnal cycle, but sediments appear to be less dynamic. The implications of this work include WB hypoxia tendency is heterogeneous over space and time. However the sediments, although important, indicate that the pelagic and benthic components are decoupled.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1971. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 389-416).

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Methylmercury (MeHg) production is magnified in the natural environment by geochemical influxes and an active sulfate reducing bacteria community. It has been found that the presence of sulfides, excess nutrients, and the type of depositional environment (normal marine or euxinic) greatly influences MeHg production and degree of pyritization (DOP). The aim of this research is to investigate a possible connection between MeHg accumulation and the DOP in Weeks Bay sediment. Collected sediment samples have confirmed a significant presence of total reduced sulfides, inorganic mercury, reactive iron, and total organic carbon. Pyritization results indicate a normal marine environment and, of the three measured elements (S, Fe, and C,) carbon and sulfur are the dominant limiting factors to the DOP in Weeks Bay. Current geochemical and pH/redox conditions favor MeHg and pyrite production. The quantified pyrite greatly exceeds that of MeHg indicating DOP inhibits MeHg precipitation.

Sediment is a major impairment in many streams and rivers in the drainage basins along the northern Gulf of Mexico. The use of geospatial technologies improves assessment and decision making for the management of environmental resources and conditions for coastal watersheds. This research focuses on the development of a conceptual qualitative model enhanced with expert input for the assessment of soil erosion potential in coastal watersheds. The conceptual model is built upon five layers (slope, precipitation, soil brightness or exposure, Kactor, and stream density) like those in a standard numerical soil loss model such as the Revised Universal Soil Loss Equation (RUSLE). The conceptual model produced a continuous surface to index erosion potential. Pearson’s correlation coefficient was used to identify variable sensitivity. The model was most sensitive to Kactor variable, followed by soil brightness, stream density, and slope. The model was not sensitive to the precipitation variable due to the lack of variability across the watershed. Expert input was added to the conceptual model for erosion potential with the Analytical Hierarchy Process (AHP). The AHP is used to value the importance of criteria, providing a quantitative weight for the qualitative data. The expert input increased the overall importance of topographic features and this increased cell counts in the upper erosion potential classes. The AHP weights were altered in 1% increments ranging from plus to minus 20% producing 201 unique runs. A quartile analysis of the runs was used to define areas of model agreement. The quartile analysis allowed for the application of an analysis mask to identify areas of increased erosion potential for improved management related decisions. The conceptual and AHP erosion potential output data, including watershed management priority rankings, were published as web mapping services for story map development as a transition to a decision support system. The limits of the story map to allow user interactions with model output rendered an unacceptable platform for decision support. The story map does offer an alternative to static reports and could serve to improve dissemination of spatial data as well as technical reports and plans like a watershed management plan.

<p> Recent evidence has demonstrated that isometric handgrip training may improve resting arterial blood pressure. The current study evaluated the ability of simple, spring handgrips to reduce resting arterial blood pressure in normotensive participants using an 8-week randomized controlled design.</p> <p> Forty-nine (age: 66 ± 1) participants, 28 female and 21 males were recruited. All participants completed 5 pre-training sessions, used to familiarize and assess baseline blood pressure, heart rate and maximal hand strength. Maximal hand strength was assessed by three bilateral, maximal contractions with a hand dynamometer. Blood pressure and heart rate were assessed with an automated acquisition system. Participants were stratified to control and intervention groups based on baseline age and blood pressure by matched-pair randomization.</p> <p> Participants in the training condition (n = 25) completed 8 weeks of thrice weekly handgrip training at approximately 30% of their baseline maximal hand strength using a spring handgrip. Seated blood pressure and heart rate were assessed prior to each training session following 10 minutes of isolated rest. Training included 4, 2-minute contractions separated by 2 minutes of rest and completed bilaterally. Control participants (n = 24) completed weekly-seated measurements of blood pressure and heart rate following 10 minutes of isolated rest. Following 8 weeks of intervention all participants completed 3 sessions of post-training measurements.</p> <p> In trained participants, resting systolic and diastolic pressure decreased significantly from pre- to post- (SBP: 122 ± 3 mmHg to 112 ± 3 mmHg, DBP: 70 ± 1 mmHg to 67 ± 1 mmHg) while heart rate remained unaltered. Pulse pressure was significantly reduced with handgrip training, from 52 ± 3 mmHg to 45 ± 3 mmHg. Control participants demonstrated no changes in blood pressure, heart rate and pulse pressure, over the course of the study.</p> <p> In conclusion, spring handgrip training results in significant decreases in systolic, diastolic and pulse pressure. The mechanisms behind these improvements remain unknown and require further investigation.</p> / Thesis / Master of Science (MSc)

AFRIKAANS: Rumohra adiantiformis (G. Forst.) Ching, die seweweeks- ofknysnavaring se gewildheid as loof in die snyblombedryf neem vinnig toe. Onder natuurlike groeitoestande ontwikkel die seweweeksvaring slegs beperkte hoeveelhede sori op blare, terwyl groot hoeveelhede sori ontwikkel wanneer die varing onder skadunet verbou word. Die teenwoordigheid van oormatige sori lei tot bemarkingsprobleme. Die navorsing is op die perseel van Bergland Tuine kwekery te Krugersdorp uitgevoer om die invloed van etefon, paklobutrasool (PP333), gibberelliensuur (GA3) , sitokiniene en verskillende skaduvlakke op sorivoorkoms en grootte van seweweeksvaringblare te bepaal. Behandeling van PP333 teen 500 mg dm-3 of met etefon teen 144 en 480 mg dm-3 in die blaarknopstadium het die getal sori by volwassenheid van blare betekenisvol verlaag. PP333-behandelings teen 1 000 en 1 500 mg dm-3 in die blaarknopstadium het die sori by volwassenheid van blare hoogs betekenisvol verlaag. Bespuitings met behandelings GA3 teen 57,6 mg dm-3 of sitokiniene teen 0,00062 en 0,0155 mg dm-3 op die blaarknopstadium het tot 'n betekenisvolle verhoging van sori op volwasse blare gelei. PP333 of etefon beinvloed nie die blaargrootte van volwasse blare wat in die jongblaar-, oopgevoudeblaar- en blaarknopstadium behandel is nie. Blare van al drie blaarstadia wat met sitokiniene of GA3 behandel is, was by volwassenheid nie-betekenisvol groter. Die 70% skadunet met bykomstige swartplastiekstroke in 'n noordsuidrigting onderaan gespan het die getal sori op blare verlaag en die blaaroppervlakte betekenisvol vergroot. Faktore soos seisoenale variasie, oesfrekwensie, plantdigtheid, grondvogstatus, waterkwaliteit, peste en plae was nie by hierdie ondersoek ingesluit nie en behoort ondersoek te word. ENGLISH: Rumohra adiantiformis (0. Forst.) Ching, the seven-weeks or knysna fern is a relatively new floral greenery of increasing importance. In its natural habitat the seven-weeks fern produces small numbers of sori on leaves, while commercially cultivated ferns under shade produce large numbers. The presence of excessive numbers of sori have a detrimental influence on the market value of the product. A trial was conducted on the premises of Bergland Tuine nursery in Krugersdorp to determine the effect of ethephon, paclobutrazol (PP333), gibberellic acid (GA3), cytokinins and different shade levels on the presence of sori and size of seven-weeks fern leaves. Leaves treated in the leafbud stage with PP333 at 500 mg dm-3 or ethephon at 144 and 480 mg dm-3 significantly reduced the number of sori on the leaves at maturity. Highly significant reduction of sori on mature leaves were found when PP333 was applied at I 000 and 1 500 mg dm-3 on the leaves in the leafbud stage. Sori numbers on mature leaves significantly increased after treatment of bud stage leaves with GA3 at 57,6 mg dm-3 or cytokinins at 0,00062 and 0,0155 mg dm-3. The leaf size of mature leaves was not influenced when PP333 or ethephon was applied on the leaves at the young leaf, unfolded leaf and leafbud stage. Leaves in all three leaf stages treated with cytokinins or GA3 showed a non-significant increase in leaf size at maturity. The 70% shade net with additional black plastic strips suspended underneath the net in a north-south direction, reduced the number of sori on the leaves and increased the leaf area significantly. Factors such as seasonal variation, harvest frequency, plant density, ground moisture levels, water quality, diseases and pests were not included in this investigation but should be researched. / Dissertation (MSc(Agric))--University of Pretoria, 2011. / Plant Production and Soil Science / unrestricted

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