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Tag: "unicellular" at biology news

Unicellular microRNA discovery

...na), report on their discovery of microRNAs in the unicellular green alga, Chlamydomonas reinhardtii. This is the first finding of microRNAs in a unicellular organism. “The finding changes the dogma that miRNAs only exist in multicellular organisms, and a...

A new male-specific gene in algae unveils an origin of male and female

...of the mating types of its isogamous ancestor, the unicellular alga Clamydomonas reinhardtii. In C. reinhardtii, isogamous sexual reproduction occurs through "plus" (MT+) and "minus" (MT-) mating types. MT- represents a "dominant sex" because a particular gene, MID ("minus-dominance") of C. reinhardtii is bot...

Taking evolution's temperature: Researchers pinpoint the energy it takes to make a species

...tion and conservation." By observing changes in a unicellular animal whose body temperature varies according to its surroundings, as opposed to a mammal, which regulates a constant body temperature, scientists could more precisely measure rates of speciation caused by the environment. In the end, it is individu...

Similar Stem Cells In Insect And Human Gut

... Cell Biology in San Francisco. The spring in the unicellular Vorticella is a contractile fiber bundle, called the spasmoneme, which runs the length of the stalk. At rest, the stalk is elongated like a stretched telephone cord. When it contracts, the spasmoneme winds back in a flash, forming a tight coil. To fi...

Are U.S. Flu Death Figures More PR Than Science?

... Cell Biology in San Francisco. The spring in the unicellular Vorticella is a contractile fiber bundle, called the spasmoneme, which runs the length of the stalk. At rest, the stalk is elongated like a stretched telephone cord. When it contracts, the spasmoneme winds back in a flash, forming a tight coil. To fi...

Nano springs eternal; Protozoan 'engine' posts nano records

... Cell Biology in San Francisco. The spring in the unicellular Vorticella is a contractile fiber bundle, called the spasmoneme, which runs the length of the stalk. At rest, the stalk is elongated like a stretched telephone cord. When it contracts, the spasmoneme winds back in a flash, forming a tight coil. To fi...

Student scientists create living bacterial photographs

...y sense light, so the students had to engineer the unicellular machines to work as a photo-capturing surface. UCSF biophysics graduate student Anselm Levskaya and his adviser, Dr. Chris Voigt, first engineered the bacteria to sense light by adding a light receptor protein from a photosynthetic blue-green algae...

Family trees of ancient bacteria reveal evolutionary moves

...for instance, the presence or absence of a sheath, unicellular or filamentous growth, the presence or absence of heterocysts ?a thick-walled cell occurring at intervals?were coded and mapped on the tree. The distribution of traits was compared with those found in the fossil record. Cyanobacteria emerging some t...

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