Fungus-Like Protists Friday, Jan 16 2009 

The last group of protist I’m going to discuss is the fungus-like protists. They are an unique group because they have both single cellular and multicellualr stages. They are heterotrophic they’d have to move at some point of their lives if they want to obtain food. They can act like decomposers where they would break down dead organisms by releasing digestive enzymes into it. Then, it would produce and release materials that are useful to other organisms in the environment.  The fungus-like protists includes water molds and slime molds.

Slime molds are single celled protists that live in moist soils, decaying plants, and trees. But when conditions are bad, the single celled organisms would join together and act as a multicellular organism. The protist would form a cluster of cells called sporangia on top of a stalk. The sporangia would then go into a dormant stage while the stalk constantly pushes the cells with its ”foot” until the cells reaches a better condition. That time, the multicellular organism would spilt itself back to its original form.

 Slime Molds

Slime Molds

 

This is the protist that surprised me the most. The slime molds could join together when times are tough, move to another place and separate again. This showed me the importance and the great power of teamwork and how weak individuals really are.

Plant-Like Protists Friday, Jan 16 2009 

Like the protozoa, they are also single celled. But the biggest different between the two is that the plant-like protists, phytoplankton are autotrophic, which means they could produce their own food through photosynthesis. Phytoplanktons are commonly called algae and have accessory pigments that help absorb the sunlight, giving the algae various colours. Also, they mostly live in water and damp surfaces. This group includes dinoflagellates, chrysophyes, diatoms and euglenophytes.

Euglena

Euglena

Euglenas are single celled phytoplanktons that live in the water. Euglena contains a nucleus, choloroplasts, flagellum, eye spot, contractille vacuole, pellicle, and cell membrane. They would use their chloroplasts for photosynthesis but when it’s dark; they could turn into heterotrophs and search for foods themselves. Euglenas have an eye spot that could detect light and dark, and they have a pellicle that’s used as a cell wall to maintain its shape. Finally, they have asexual reproduction by binary fission. Like the amoeba, it would divide its every body parts into two, and then the middle would split, separating the organism into two.

Euglena Dividing

Euglena Dividing

 

I think it’s really cool how the Euglena could change from being an autotrophic into a heterotrophic if their aren’t any sunlight. I don’t think there’s anything besides this organism that could do that and i find that really interesting.

What are Protists? Friday, Jan 16 2009 

Protists are single celled (eukaryotic). Many scientists believe that they have existed for as long as 2 billion years. Antoni van Leeuwenhoek, a Dutch scientist was the one who discovered it at 1676 under a microscope, calling the tiny animal like creatures “animalcules”.

During the late 1800s, a new kingdom was created for the microscopic creatures. Although protists are not plants, animals and fungi, they still live, eat , reproduce and contain parts such as nucleus and organisms like other living things. Protists also have many shapes. Some like amoeba could change their shapes while some are stiff. They mainly live in water or moist soil and have two different ways to get food, using photosynthesis (photoautotrophs) or eating other organisms (heterotrophs). But not all protists are good; some could cause serious human disease such as malaria and sleeping sickness.

I think protists are really cool. We don’t ever notice these microscopic organisms even though we interact with them every single day. What really surprised me is that Antoni van Leeuwenhoek was able to discover these amazing creatures 300 years ago. They didn’t have any sort of technology like the ones today but he’s still able to overcome it and discover these protists by himself. But I didn’t really like the fact that they put the protists into a kingdom because they were considered “leftovers”. Though we have come a long ways in discovering the protist’s characteristics, reproduction, etc… I’m not that satisfied. I wish we could discover more and put them in their appropriate kingdoms where the organisms would have way more similarities than it is right now.

Hello world! Monday, Dec 15 2008 

Welcome to WordPress.com. This is your first post. Edit or delete it and start blogging!