Archives for June, 2014

New research published in PLOS Genetics shows that starving C. elegans (Caenorhabditis elegans) during the late larval stage of development when the worms are undergoing tissue growth and formation halts cellular activity at previously unknown checkpoints in their development. These findings show that nutrition is an important cue to signal whether or not the worms should…

  It is not surprising that Biwa salmon (image above), a subspecies of Oncorhyncus masou, do not adapt to seawater very well after having been landlocked in Lake Biwa, Japan for the last 500,000 years or so.  Researchers from Hokkaido University and Shiga Prefecture Fishery Experiment Station in Japan wanted to know what caused the salmon to…

Shivering is one mechanism by which heat is produced in the body. Heat production is called thermogenesis. Another mechanism is through nonshivering thermogenesis regulated by brown fat (i.e. adipose). This second type of heating mechanism kicks in when we need extra heat production such as a postnatal infant, someone developing a fever, an animal arousing…

The original tree hugger

New research sheds light why koalas (Phascolarctos cinereus) spend so much time hugging trees. As shown in the infrared image above, the trees stay cool on hot days. Since koalas do not sweat, hugging trees is another method to keep their cool in addition to panting and licking their fur. The research also shows that the…

Big-Eared Bat Rediscovered

The New Guinea big-eared bat (Pharotis imogene; specimen pictured above) was thought to be extinct for the past 120 years. The bat is now considered critically endangered or possibly extinct as this specimen is the only known member of the genus. Since very little is known of this endangered bat, researchers who identified this specimen suggest…

How zebrafish sense calcium

Calcium is very important for the normal development, growth and survival of most vertebrates. Therefore, regulation of calcium intake and disposal is well-controlled. Mammals obtain most of their calcium from the diet, whereas fish obtain calcium by absorbing it from the external environment. For adults, this occurs in the gills and for larvae it is…