photosynthesis measurement system Articles

  • Recovery of photosynthesis and growth rate in green, blue–green, and diatom algae after exposure to atrazine

    We evaluated the recovery of photosynthesis and growth rate in green (Pseudokirchneriella subcapitata), blue‐green (Anabaena flos‐aquae), and diatom (Navicula pelliculosa) algae after pulsed exposure to atrazine. Subsequent to a grow‐up period of 24 to 72 h to establish requisite cell density for adequate signal strength to measure photosystem II (PSII) quantum yield, algae were exposed to a ...


    By John Wiley & Sons, Ltd.

  • Measurement of Circadian Gas Exchange Dynamics in Arabidopsis thaliana

    Dr. Alex Webb and Dr. Antony Dodd (Cambridge University (UK), Department of Plant Sciences) and PP Systems have developed a unique gas exchange system for use with Arabidopsis. The custom system is being used as part of a program to dissect the architecture of the signal transduction networks that regulate circadian rhythms of stomatal aperture and photosynthesis. Since this is being addressed ...


    By PP Systems

  • Soil CO2 Flux Measurements: Comparisons Between the LI-COR LI-6400 and LI-8100

    Introduction The basic design features of LI-COR soil CO2 flux chambers were first published by Norman et. al., (1992), and the various factors known to influence the measurement of ground CO2 flux were summarized in LI-COR Application Note #124 and Welles, et. ...


    By LI-COR

  • Stability and accuracy of CIRAS-2 Water Vapor (reference humidity): control option 1

    Summary Rapid large-scale fluctuations of carbon dioxide and water vapor, although unnatural and artificial in the plant world, are desirable attributes for gas exchange systems from a sampling efficiency standpoint. As PP Systems’ benchmark IRGA system for gas exchange and photosynthesis research, CIRAS-2 was designed for and expected to have exceptional response times to ...


    By PP Systems

  • Estimation of stand productivity from multi-angular optical remote sensing

    Global modeling of gross primary production (GPP) is a critical component of climate change research. On local scales, GPP can be assessed from measuring CO2 exchange above the plant canopy using tower-based eddy covariance (EC) systems. The limited footprint inherent to this method however, restricts observations to relatively few discrete areas making continuous predictions of global CO2 fluxes ...


    By PP Systems

  • Quantifying Chlorophyll in leaves using a non-destructive method with the UniSpec-SC

    Chlorophyll is a driver of the physiological function of leaves. Quantifying chlorophyll content can provide information regarding the physiological state of leaves. Chlorophyll tends to decline rapidly when plants are under stress or during leaf senescence (Gitelson & Merzlyak 1994). It is very vital to understand the pattern of the pigment content change if we are to understand ...


    By PP Systems

  • Lichens show that fungi can acclimate their respiration to seasonal changes in temperature

    Five species of lichens, the majority members of a soil-crust community (Cladonia convoluta, Diploschistes muscorum, Fulgensia fulgens, Lecanora muralis, Squamarina lentigera) showed seasonal changes of temperature sensitivity of their dark respiration (DR) to such an extent that several substantially met the definition of full acclimation, i.e. near identical DR under different nocturnal ...


    By Springer

  • Evaluation of acute ecotoxicity removal from industrial wastewater using a battery of rapid bioassays

    The present study compares conventional wastewater treatment technologies (coagulation–flocculation and activated sludge) and powdered activated carbon (PAC) treatment for the removal of acute ecotoxicity from wastewater generated by tank truck cleaning (TTC) processes. Ecotoxicity was assessed with a battery of four commercially available rapid biological toxicity testing systems, ...


    By IWA Publishing

  • CIRAS-2 Export function-simplified data format with numerical and graphical data views

    Perhaps some of the most exciting moments for CIRAS-2 Portable Photosynthesis System users come when the time arrives to view meaningful data sets. What many new users will not realize is that they have the option of viewing these data in two formats: raw CIRAS-2 format (.dat) and a much streamlined Export format (.tab). Both formats easily and automatically import and parse into spreadsheet ...


    By PP Systems

  • Gene Expression Profiling of The Budding Yeast S. Cerevisiae Upon Exporsure to The Pesticide Atrazine

    Atrazine (ATR; 2-chloro-4-ethylamino-6-isopropylamino-s-triazine), a chlorinated triazine, has been one of the most heavily used herbicides in the world. It is used to control a variety of broadleaf weeds and grasses and as a result of its widespread use and moderate persistence, it has been identified as a principal contaminant of surface waters [1]. It can be present at several parts per ...


  • Wood briquettes with an innovative form

    Briquetting has allowed one wood processing firm to optimise its strategy for increasing value and has led to the creation of a new line of business. Robeta OHG operates a saw mill in Brandenburg, Germany. The company processes around 280,000m3 of pine wood a year, which is sourced exclusively in the forests of Brandenburg and Mecklenburg-Vorpommern. Instead of selling on loose ...

  • The Role of Soil Moisture on our Climate, Weather and Global Warming

    Global warming is a topic that has received much attention in the media, especially during the hot days of summer. The process by which carbon dioxide (CO 2) in the atmosphere prevents the escape of thermal energy into outer space is known as the green house effect. The higher the carbon dioxide levels in the atmosphere the less thermal energy that can escape thus an increasing global ...

  • Water quality is key to the success of Cardiff Bay

    Water quality has been a central theme in a redevelopment project that began with the creation of the Cardiff Bay Development Corporation in April 1987. This article will examine the role that water quality has played in the remarkable transformation that has taken place in Cardiff and explain how monitoring technology has developed to the stage whereby any person, anywhere in the world, can view ...

  • Fires at Composting Facilities: Causes and Conditions

    The subject of fires at composting facilities is a bad news/good news situation. The bad news is that fires are more common than we realize. Ask a group of facility operators if they have had to deal with a fire, and the majority will quietly admit they have. The good news is that we don’t realize that fires are fairly common at composting facilities. Most are neither frequent nor destructive ...


    By BioCycle Magazine

  • Taming taste and odor (T & O) problems in a water treatment plant

    Taming Taste & Odor (T&O) Problems Some taste and odors are caused by mineral constituents in the water, e.g. excess chlorine and hydrogen sulfide. However the majority of taste and odor are the result of biologic activity. Spring turnover of lakes and algal blooms are responsible for Blue-green algae (Cyanobacterium), Green algae and diatoms that introduce filter clogging organisms ...


    By Jenfitch, LLC

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