Seaweed Biology - Science topic
Marine macroalgae commonly known as seaweeds are utilized for a variety of purposes including food, pharmaceyticals, neutraceuticals, plant growth promotion and phycocolloids such as agar, agarose and carragennan.
Questions related to Seaweed Biology
I am looking for information, especially in the form of review paper on global seaweed utilization. Any help in this regards is appreciated.
Kindly suggest me a best protocol to estimate the auxin, cytokinin gibberellin and Betain in the liquid seaweed extract.
The impact of ecological factors on the content of bioactive compounds sulfated polysaccharide in brown seaweed
Hi again everybody :)!
As a part of my research, I'm culturing some protoplast from brown algae (using non-axenic material) in different regeneration media and at different initial cellular densities. While i was recording the cell wall regeneration (using Calcofluor) i realized that in almost half of the protoplast that were undergoing cell wall regeneration, a cellulose "tail" started to form (like a "comet"). At the end, the protoplast were covered with the cell wall but this "tail" remained. In other cases, the protoplast didn t finish the cell wall regeneration. The percentage of this "cellulose tails" were variable in the different media and at different densities, but anyway this phenomenom appeared in all the treatments. Checking some publications i found that this could be due a loosely attachment of the cellulose to the cell membrane. However, i didn t see this phenomenom in seaweed protoplast. Has anybody seen this abnormal cell wall regeneration?
Many thanks in advance
Seaweeds are the integral part of multi billion industry with their variety of usage in food, pharmaceuticals, phycocolloids and agriculture etc. The basic molecular biology chemical i.e. agar or agarose is the product obtained from seaweeds. With their enormous industrial importance, seaweeds are also gaining global interest as a feedstock for biofuel. However, the systematics or taxonomic classification of these lower group of plants remained doubtful due to high level of morphological plasticity. Therefore this group require strict classification characters supported with molecular tools. In this context DNA barcode investigation will suerly benefit.
Further little is known about the biochemical composition or their networking (fluxomic) of seaweeds. Therefore it will also be of great interese to understand metabolomics of seaweeds.
During my field visits to marine area i have collected some amount of Centroceros sp.(Rhodophyta) from West Coast of India (Kerala). I wish to identify it into species level. which book or monograph shall i refer and i wish know the current status of distribution and diversity of Centroceros sp. in India.
Thanks in advance,
Estimation of Gigartina acicularis biomass in coastline.
Thank you in advance
This macroalgae has been collected at Kovalam beach (near Chennai). I would like to know the name of this species.
Can anyone help in identifying this one?
Are there any known species of edible seaweed that can be cultivated in aquaponics in order to enrich the water with oxygen? What are their needs in nutrients? Could they be cultivated along side with fish and tomatoes for example?
When I went Andaman and Nicobar Islands i visited some of the locations as a tourist still i didnt had permission for collection i took photo of some of the seaweeds. just posting it here so that i can get knowledge on these seaweeds.kindly identify these and provide some informations regarding these algae.
kindly confirm my identification also.
1. Caulerpa recemosa
2. Boergesenia forbesii
I am looking for publications or reports those depict bio-chemical composition of conchocelis stage of Porphyra / Pyropia. Also, I am interested to know if, this stage has been cultured any-where in bio-reactors?
I am aware of high temperature tolerant cultivar of Porphyra haitanensis that has been developed through breeding and farmed extensively in China. There are also examples of Saccharina and Undaria spp in which improved strains were developed for commercial farming.
It would be helpful, if I may be provided with recent developments in the field of breeding in seaweeds.
I have seen this in heavy loads in kappaphycus seaweed and i want to identify the species and also i want to know this filter feeders will affect the growth of the culture seaweed
I have been working on strain selection and improvement in Ulva spp. Since we have several strains differing in their growth patterns under same (controlled) culture conditions, I am interested in studying growth kinetics of fast as well as slow growing strains.
Although, I have some knowledge about setting of these experiments, I need advice from the experts - even those working on other organisms - who are involved in studying kinetics.
Anticipating references and suggestions.
I was wondering, if there is any study similar to Mendonza et al. (20006) Botanica Marina, 49: 57-64. I am interested to know how many seaweeds have been researched wherein tissue age was main factor determining quality as well as quantity of phycocolloid.
I would like to know if any counties have selected national policies pertaining to seaweed farming. This essentially is required to boost commercial activities.
From September the coasts of the Mexican Caribbean has received tons of pelagic Sargassum stranded in sandy beaches and this causes some concern in the tourism sector. There is a conflict because this subsidy is important for macrofauna of sandy beaches, besides the beach raking to remove wrack impacts the beach ecosystem. It is urgent to deal with this situation in order to find best solutions for this issue.
I enriched Ulva for 6 hrs, dried and crude protein content was determined. I am uncertain if the increased in crude protein after enrichment is due to the assimilated fertilizer converted into protein of Ulva or may be it is still the fertilizer per se.
I highly appreciate in receiving any kind of information or a source where market value for crude pigments (mixture of R-phycocyanin, R-phycoerythrin), crude lipids and cellulose is given.
We have been facing problem with preserving sufficient quantities of seaweed germplasm - about 1 tone fresh weight - for resuming commercial seaweed farming in subsequent season. The conditions on West coast of India are pretty rough during monsoon. May I request the researchers involved in seaweed farming to recommend simple and innovative solutions which we can develop for Indian conditions and could be quickly adopted by local fishermen?
Even though 'tropical seaweeds' is a very broad field, as it would be 'temperate seaweeds', I still would like to have the most useful guides at hand just to see not only if I ever get them right but it is important to systematize the guides for farming/harvesting from the wild to use them, separating this field from the more phycological one that needs to identify every seaweed.
My question is of general nature to those researchers who are engaged in implementing projects of societal benefits, in our case seaweed cultivation. I am sure, convincing locals (beneficiaries) is challenging task, in initial stage. How researchers in different sectors have overcome this hurdle? Are their any reports and experiences which some of you can share, so that, I can take forward, commercial seaweed farming in newer areas along Indian coast.
Hello everybody :)
My research is focus on cell suspension culture from seaweed protoplast for production of bioactive molecules. But I have a problem, I want to know if they are really in a dedifferentiated state so I was wondering if there are any molecular marker (or markers) for this state in plants or seaweeds. I just want to be sure that the cells that I have will not form any kind of tissue and they will remain in this state.
Thank you in advance
I have collected this seaweed in the intertidial rocky shore of Ancash (north central coast of Peru). Does anybody have a suggestion about its genus or species? (I know I have to do microscopic observations but any idea would be nice!)
I am looking for the handy instrument to measure tide / current in our seaweed cultivation farm located in South India. I am interested in knowing the displacement of water in intensive cropping, that actually is responsible for renewed nutrient supply to growing seedlings. Any suggestions and experiences to choose the model are highly appreciated. Also if any body has attempted such studies can provide me with related references.
Is the any other reason other than temp and pollutant will diminish seaweed culture.Any seaweed associated fauna will shrink the growth of seaweed culture Species Kappaphycus sp
My research would like to focus on identifying whether the Sulfated polysaccharide I have extracted from my brown seaweed sample is Fucoidan containing. I have browsed the online catalog of Sigma-Aldrich for possible reference standards for HPLC and am currently confused which of them to buy.
Since Fucoidan polysaccharides contain fucose, I think I will not use pure fucoidan found in Sigma-Aldrich, since the pure fucoidan were not extracted from the exact species sample I am using.
But then I was confused because there are quite a number of fucose samples found in Sigma-Aldrich. Two of which are of opposite optical rotation. Is optical rotation important in choosing the proper standard for HPLC?
A. L-(-)-Fucose ≥ 99%, 10mg at $36 (first link)
B. L-(-)-Fucose USP Reference Standard, 200mg at $393 (second link)
C. D-(+)-Fucose ≥ 98%, 500mg at $129 (third link)
According to a study, link number 4 below, Fucoidan are esterified L-Fucose. Does this mean I should cross out choice letter C because it is dextrorotatory? What is the significance of optical rotation of sample and reference standard in HPLC use?
Finally, I am tempted to buy choice A because it is cheaper, and considering that my research is independently funded, I have to opt for cheaper means to finish my research. Will choosing choice A be inappropriate? Is choice A even usable in HPLC? What is the advantage of choice A over B, vice-versa? More so, is 10mg of the standard enough for use in HPLC?
I'm working on bioactivity of seaweeds. I have taken 5 kg amount of seaweed, extracted in the respective solvent, filtered and evaporated but I don't know that how much quantity of extracted material is required to isolate all compounds.
Hey guys. I am trying to acclimatize seaweed of Kappaphycus alvarezii in a recirculating system with filtration (corals, carbon active, filter cotton and bioball). I preserved the fresh, healthy seaweed in a cool box of 4 degree celcius from seaweed cultivation field to my laboratory in about 9 hours. Right after arriving at the laboratory, I placed the seaweed in chilled condition in the aquarium filled with seawater. Then in about 5 hours after that, I observed the seaweed's appearance and realized that the seaweed appeared to be wrinkled and shrinked; there were also thick green lines in about 1 cm which I assume to be the chlorophylls, while the rest of the seaweed color is still green but less green than the ''chlorophylls''.
I presume that there were mistakes in the method of preservation. Is it ok to still preserve the seaweed in chilled condition to acclimatize it in the laboratory? Or maybe I should have waited the cold seaweed to turn warmer in a room temperature before placing it in the aquarium...
Could someone please help me with this?
Thank you very much beforehand :)
When going through some Ascophyllum nodosum (N-Atlantic) I found this nice looking hydrozoa. Does anyone here have some ideas about the species name?
We are currently working on epiphytic infestations in commercial seaweed farming. It would be nice, if some one could share literature on interaction studies between host (algae) and epiphytic organisms also chemical and molecular signalling. The references pertaining to other marine plants such as seagrass also would be welcome addition.
I would like to know more about the nutritional properties of the seaweeds of the region.
This plant is very similar to Nitophyllum punctatum, but has microscopic veins, which N. punctatum normally doesn't have. In addition, the tetrasporangia of N. punctatum up to 175 µm in diameter, whereas this specimen never exceeds 65 µm. Can you help me to identify this species? Please find images attached.
Samples in dried (dead) padina and gracilaria
Light REEs (Yb)..Heavy REEs (La)
I am looking for references regarding LT50 values for plankton in tropical seas.
I am preparing to do photosynthesis' experiment of seaweed Sargassum sp. to estimate carbon fixation and nutrient absorption from light and dark bottles' method at different periods (1 and 2h) in the field. Due to my lab having no instruments to measure C directly from experiment I' d like to use DO concentrations converting to C concentrations. Based on the experiment, I'd like to estimate carbon fixation of seaweed from dissolved oxygen (DO) concentration that I got from experiment' measurement between light and dark bottles. I also tried to estimate how much NO3, NH4 and PO4 can be absorbed by seaweed from experiment at different phase (light and dark). However, I've not found any related studies yet. So, if anyone know publications related to such experiment, please kindly let me know or any experienced experiment sharing is welcome. Thank you so much.
I would like to perform reciprocal transplantation of Sargassum. Any suggestion which method to follow?
I am trying to figure out the total sugar content present in Laminaria, Ascophyllum and Fucus.