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Daily UV-B treatments and elevated CO_(2)increases pigment concentrations and net photosynthesis of basil(Ocimum basilicum L.)

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Technology in Horticulture 2022年第1期2卷 9-15页

作者： T.Casey Barickman skyler r.brazel Akanksha Sehgal Charles Hunt Walne K.raja reddy Department of Plant and Soil Sciences Mississippi State UniversityNorth Mississippi Research and Extension CenterVeronaMS 38879USA Department of Plant and Soil Sciences Mississippi State UniversityMississippi StateMS 39762USA

Anthropogenic emissions have greatly influenced UV-B radiation incidence and CO_(2)concentration *** interactive effects of projected incidence on crops by the end of the century need to be studied to understand the *** use of sunlit plant growth chambers in combination with UV-B radiation and CO_(2)treatments was used to identify the individual and interactive effects on basil'Genovese'*** included 0 and 10 kJ m−2 d−1 UV-B supplementation at ambient(437 ppm)or elevated(725 ppm)CO_(2)*** of UV-B by CO_(2)interactions existed for net photosynthesis,light-adapted maximal quantum efficiency,all plant pigment concentrations,and ***-B increased leaf temperature by approximately 1°C while elevated CO_(2)concentrations amplified superoxide dismutase and ascorbate peroxidase activity in basil *** deleterious impacts on plant health,UV-B radiation is essential for stimulating healthful compounds in *** the effects when combined with elevated CO_(2)is necessary to improve crop production and future research.

关键词： elevated treatment (2)

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Assessment of Mercury Concentrations in Water and Fish Tissue Analysis in Kaw Lake, Oklahoma, 2022

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Journal of Environmental Protection 2023年第1期14卷 50-65页

作者： Dejene Alemayehu Pratyaydipta rudra skyler Mathews Emily Douglas Cody regnier Kaw Nation Environmental Department Kaw City USA Department of Statistics Oklahoma State University Stillwater USA

The Kaw Nation has been collecting water, sediment, and fish samples from Kaw Lake and upper Arkansas river from 2007 to present to examine the concentrations of Mercury and other heavy metals to protect the health of the tribal members. Kaw Lake is in the North-Central part of Oklahoma. Kaw Lake is a permanent water body constructed in 1976 by the Army of Corps of Engineers. The Lake is consistently fed by the Arkansas river and other tributaries as runoff coming all the way from Colorado through Kansas to Kaw Lake of Oklahoma. The Lake has a surface area of 26.64 square miles (69 km2) and shoreline of 168 miles (270 km) with a total drainage area of 56,345 square miles (145,393 km2) and an average water depth of 8 meters. The water and fish samples were collected from 7 sites of Kaw Lake, once in a month and the fish samples once in a year during summertime, early July to end of July. The fish samples focused on 5 sport, predator, and bottom dwelling species of large consumable size, greater than 200 mm length and 560 grams weight. The five fish sampled were Catfish, White bass, Largemouth and Smallmouth bass, Black and White crappie. The fish and water samples were sent to Accurate Environmental Labs for detailed analysis. Predator species were analyzed as fillet and the bottom dwellings as a whole fish using EPA Method 7471A-M. Mercury from Water and Fish Tissue Samples were analyzed by Atomic Fluorescence Spectrometry. The laboratory analysis indicated that all the Mercury concentration in the fish samples except in Blue Catfish and Spotted Bass fall below the Maximum Contaminant Level (MCL) of 0.5 mg/kg.

关键词： Mercury Contamination Fish Tissue Bioaccumulation

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Improving Concrete Containment Structures Associated with Fixed-Cone Valves

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Engineering（科研） 2011年第5期3卷 445-451页

作者： B. skyler Buck Michael C. Johnson Zachary B. Sharp 不详

Fixed-Cone valves are often used to dissipate energy and regulate flow at the low level outlet works of dams. Fixed-Cone valves, also known as Howell-Bunger valves, create an expanding conical jet allowing the energy of the water to dissipate over a large area. However, in many applications constructing the large stilling basin necessary for these valves is either not possible or not feasible. In order to reduce the relative size of the stilling basin, hoods or concrete containment structures have been used in conjunction with Fixed-Cone valves. This paper discusses the use of baffles in concrete containment structures in order to dissipate energy in a considerably confined space. It was determined that using baffles, in place of a deflector ring and end sill (Used in traditional containment structures.), significantly improves the function of containment structures by reducing downstream flow velocities and improving flow patterns and stability. This information will be useful to engineers allowing them to minimize scour and erosion associated with concrete containment structures.