photosynthetic activity Articles
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Dairy wastewater treatment using an activated sludge–microalgae system at different light intensities
A microalgae–bacteria system was used for dairy industry wastewater treatment in sequenced batch mode in a photobioreactor. The research investigated the influence of two light intensities: 360 and 820 μmol m−2s−1 on treatment performances, microalgal cell recovery and dynamics of the protozoan community. Results showed that the light intensity of 360 μmol ...
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Trends in Temperature, Secchi Depth, and Dissolved Oxygen Depletion Rates in the Central Basin of Lake Erie, 1983–2002
We examined temperature trends in a 20-year set of monitoring records collected at mul- tiple deep-water stations in the central basin of Lake Erie. Data collected were statistically corrected (“deseasonalized”) to remove biases resulting from irregular sampling intervals within years. Depth- integrated summer temperature has increased by an average (±SE) of 0.037 ±0.01°C per year. An observed ...
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Effects of photodemethylation on the methylmercury budget of boreal Norwegian lakes
MeHg concentrations in freshwater fish from southeastern Norway continue to increase, highlighting the need for a comprehensive understanding of MeHg sources, cycling, and degradation in the aquatic environment. The authors assessed the importance of photodemethylation (PD) in the MeHg budget of four Norwegian lakes. PD rates (kpd) were determined through incubation experiments with ...
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Measuring Diffused Sunlight in Lakes - Case Study
Case Study Description Using miniPARS to Measure Diffused Sunlight in a Pocono Lake Rachel Pilla of Miami University is deploying PME’s miniPAR loggers to measure photosynthetically active radiation (PAR) in a lake located in the Pocono region of Pennsylvania. Her lab has been studying the lake for over 30 years. She deployed the miniPAR sensors in the summer of 2018, with a particular ...
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A new photo-activated sludge system for nitrification by an algal-bacterial consortium in a photo-bioreactor with biomass recycle
Wastewater treatment technologies requiring large areas may be less feasible in urbanizing regions of developing countries. Therefore, a new technology, named photo-activated sludge (PAS), was investigated to combine the advantages of regular activated sludge systems with those of algae ponds for the removal of ammonium. The PAS consisted of a mixed photo-bioreactor, continuously fed with BG-11 ...
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Types of weather sensors
Introduction to weather instruments Our weather sensors provide accurate and reliable weather data for a wide range of applications. With advanced iot sensors and wireless connectivity, it provides the necessary information for weather forecasting, agricultural planning, outdoor safety, and research. Keep in touch with the weather station. Accurate weather forecasting plays a crucial role in ...
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High Pb concentration stress on
Typha latifolia growth and Pb removal in microcosm wetlandsWhen constructed wetlands are used to treat high-Pb wastewater, Pb may become a stress to wetland plants, which subsequently reduces treatment performance and the other ecosystem services. To facilitate the design and operation of constructed wetlands for treatment of Pb-rich wastewater, we investigated the irreversible inhibitory level of Pb for Typha latifolia through experiments in microcosm ...
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Short-Term Variability in Water Quality in Indian Bayou - Case Study
Project Details PRODUCT(S): miniDOT Logger, miniPAR Logger APPLICATION: Salt Water PARAMETER: Diffused Sunlight, Dissolved Oxygen LOCATION: Indian Bayou, Pensacola Bay System, North Florida ORGANIZATION: Center for Environmental Diagnostics and Bioremediation, University of West Florida RECOGNITION: Katherina Smyth and Dr. Jane Caffrey Case Study Description Run-off from construction, ...
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Long-Term Water Quality Monitoring Deployments with the Sea-Bird Hydrocat-Ep - Case Study
The new Sea-Bird Scientific HydroCAT-EP incorporates a suite of physical and biogeochemical sensors into a single, robust instrument designed to maximize water quality parameters and give sustained accuracy. The instrument uses the same high quality Sea-Bird and WET Labs sensors found on their industry leading CTDs and ocean systems in a robust, compact package designed for extended ...
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Long-term changes in the northern Adriatic ecosystem related to anthropogenic eutrophication
Knowledge of the mechanisms driving long-term changes in the nutrient and primary production cycles represents a basic step to verify real eutrophication trends in shallow marine ecosystems, such as the northern Adriatic open waters. In fact, this ecosystem appears to be especially sensitive to seasonal and long-term variations of the anthropogenic nutrient load (primarily the Po River ...
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A fully automated system for measurements of photosynthetic oxygen exchange under immersed conditions: an example of its use in Laminaria digitata (Heterokontophyta: Phaeophyceae)
Abstract A new, fully-automated, closed-chamber system was developed for measuring photosynthetic activity in aquatic plants, algae, or corals during immersion. The performance of this system, which monitors oxygen exchange, was evaluated both in the laboratory and in situ under natural conditions using the seaweed Laminaria dtgitata. Intact, large individuals were placed inside the chamber and ...
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The Cause and Effect of Harmful Algal Blooms
Management of Cyanobacteria Harmful Algal Blooms The California Lake Management Society (CALMS) is a non-profit organization that works to manage lakes and reservoirs throughout California. In April of 2023, Precision Measurement Engineering (PME) had the privilege of attending a webinar hosted by CALMS. Guest presenter Rick Almalfi, Vice President at Aquatic Consulting & Testing Inc, ...
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The Cause and Effect of Harmful Algal Blooms
Management of Cyanobacteria Harmful Algal Blooms The California Lake Management Society (CALMS) is a non-profit organization that works to manage lakes and reservoirs throughout California. In April of 2023, Precision Measurement Engineering (PME) had the privilege of attending a webinar hosted by CALMS. Guest presenter Rick Almalfi, Vice President at Aquatic Consulting & Testing Inc, ...
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Wastewater Daily Discussion - Stabilizat
Expert 'Tip & Tricks' from out friends at all-about-wastewater-treatment.com Several factors may significantly affect or aid, the hydraulic and biological behavior of waste stabilization ponds. Some, not all, can be taken care of during ...
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Water trends in optimization for 2023: the role of artificial intelligence
Water is essential for life on Earth, but it is a finite resource. The data compiled in reports by organizations such as the UN, UNICEF, and the FAO point to overexploitation of water as the main cause of scarcity, with between 43% and 50% of the world’s population not having access to drinking water. Against this background, optimizing water management is a major, highly necessary ...
By Idrica
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Ammonia Control in Aquaculture: What you need to know
Every fish farmer knows about ammonia. It’s a constant battle, especially in warmer months, to keep levels low and your fish and shrimp healthy. But what is ammonia? Why does it cause problems in aquatic life? Outside of testing, what are the best steps you can take to eliminate ammonia? Here, we outline the answers to those questions. Understanding Ammonia Ammonia, as a colorless ...
By QB Labs, LLC
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Oxygen Supersaturation Protects Coastal Fauna from Ocean Warming - Case Study
The Danger Posed by Warming Oceans Warming ocean water can stress fish and other aquatic animals, sometimes to the point where organismal survival is threatened. The mechanism by which this occurs is well understood. A rise in water temperature causes an increase in animal metabolism, increasing the rates of, and need for, respiration, while at the same time reducing the supply of dissolved ...
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Ultrasound for algal bloom control: background, research and effects
Blooming of (toxic) algae is a global problem that increases each year due to pollution and climate change. In order to restore our aquatic ecosystems, actions must be taken that address excess algal growth. Over the past years, innovations around lake restoration and algal bloom remediation have been introduced and tested. One of these methods is the use of interactive systems that control ...
By LG Sonic
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CO2 photoassimilation, chlorophyll fluorescence, lipid peroxidation and yield in cotton (Gossypium hirsutum L. cv Giza 65) in response to O3
Over the recent years, convincing evidence has emerged of both a decrease in stratospheric ozone (O3) and an increase in tropospheric O3 concentration. There is an intimate relationship between O3 and photosynthesis (A), which is ultimately linked to plant growth and yield. Photosynthetic response, chlorophyll fluorescence, Rubisco activity, lipid peroxidation and yield of an Egyptian cultivar of ...
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