Recent content by Dana Riddle

JB, Antennae pigments funnel harvested light energy to the PS II reaction center containing Pigment 680. It doesn't matter if the light is collected by chlorophyll A, C2, peridinin or any other accessory pigment - P680 is the gateway. Since the light produced by the metal halides in...

All, Re: the PAM article in February's AAOLM - I'd like to take a opportunity to clarify some issues in the AAOL Forums. Several advanced hobbyists took issue with the results of the experiment Dr. Olaizola and I conducted. Naturally, they are entitled to their own opinions (although I would...

Richard, I find it interesting that you have apparently changed your opinion on velocity v. turbulence in an aquarium. I recall your statement at the Ft. Lauderdale MACNA, something like "It isn't velocity that counts, it's turbulence." Your product review doesn't indicate how you arrived at...

Mike, I did indeed check a few chemical and physical parameters before the sewer ties were made. First, some background. Kailua-Kona is a popular tourist attraction because of abundant sunshine and low rainfall. Being in the water business, we routinely monitor groundwater nutrients...

Hi Mike, Long time, no see - missed you on the last trip to Chicago. Just a quick comment on your model. As you're probably aware, certain nutrient mass transfer is limited when water motion is low. The boundary layers around a static object may limit diffusion rates. But I'm assuming...

Hi Steve, Microcosm is still publishing? Under the TFH banner? Yes, would like to see more of your argument. All I can say is that the 4,000K lamp worked for us (although there were two 40-watt fluorescent lamps along side). After this first-hand evidence, the fact that the respirometer...

Hi Steve, Hope your trip went well. Our comments are clearly straying outside the article’s scope. I have a coral fluorescence article in the works, so I’m sure we can discuss that later. Just a couple of quick comments: >>There sure is a difference if you look at the spectral curve within...

Hi Steve, >>Thanks for the photo and the data from your experiments.<< You bet. >> Unfortunately about all I can tell from the photo is that corals were present. Not enough detail to judge zooxanthellae density or pigment intensity. Taking quality photos of corals was not easy back in those...

Steve, To answer your questions: >>Send it to [email protected] . Please make sure its a small GIF file in byte size but large in resolution. Can you list the sps corals that grew under these bulbs ? Also note color morph and growth form, if you have the time. In my travels I have now...

James, Ohana - obviously an Hawaiian word and means several things. Ohana could mean "family" and it is sometimes heard in that sense, although it generally means a small, separate house for a family member to live close to relatives. Haolies (like me) most often use "ohana" to mean a place...

Mitch, These lamps have created a 'buzz' lately. I've never tried them, but would think their spectral quality is nothing extraordinary and light intensity per watt is about the same as other 'white' fluorescent lamps. General rule of thumb: If a lamp will grow houseplants, it'll probably...

Hi Steve, To address your concerns... >>Nothing was done to differentiate ambient light > 700 nm and auto fluorescent light due to photosynthesis. At each exposure the coral was then exposed to the short saturating light pulse from the PAM meter and the autofluoresence from photosynthesis was...

Richard, >>The 1987 article was essentially an addendum to the 1984 article. I suggest that you read it. Here's what Kinzie had to say: "While acclimation intensity had a pronounced effect (on photosynthesis), the results also showed that the color of the acclimation treatment influenced the...

Hi Steve, Long time, so see. I do hope things are going well for you. >>Nice article. However, as usual I have a few questions.<< Thanks, and I thought so ;-). >>You measured the 'energy' of the light to determine the correct location for each predetermined jig position ? Dont you mean you...

Eric, I appreciate your comments and hope to have some time later to discuss the article. Please don’t think I’m ignoring you or anyone else if my replies become sporadic due to various constraints on my time. Just some quick comments though: >>You can't extrapolate that finding to all...