The PhD study bt Dr. Susan Theiss showed that the wobbegong visual system contains only a single class of cone photoreceptor. Cone photoreceptors are the retinal cells that are used for vision under bright light conditions, whereas as rod photoreceptors are used in dim light.
These previous studies looked at opsins, which are light-sensitive proteins found in the photoreceptor cells of the retina. Rod opsins are used in low light and produce a black and white image, while cone opsins are used in bright light, and often to see colours.
Is there another country anywhere with so much diversity? The six million inhabitants of this nation of mountains and islands are spread over 463,000km2 of mountainous tropical forests and speak over 800 different languages (12 percent of the world total). Papua New Guinea occupies half of the third largest island in the world as well as 160 other islands and 500 named cays.
I’ve been on the road for 36 hours now, and I’m pretty much on the other side of the world from where I started back in rain drenched England. At last, I’m approaching the final legs of the journey—just a short one-hour flight to go.
Things have gone smoothly so far, I’m thinking, as I wander up to the check-in desk for the last leg of my trip. “The flights full,” the attendant tells me, “You’ll have to wait until tomorrow.
The Me 323 was the result of a 1940 German requirement for a large assault glider in preparation for Operation Sea Lion, the projected invasion of Great Britain. It was a powered variant of the Me 321 military glider and was the largest land-based transport aircraft of the war. A total of 213 are recorded as having been made, a few being converted from the Me 321.
South Georgia is the most well-known of the Falkland Islands, also called Islas Malvinas. It lies nearly at the end of the world in the Southern Atlantic Ocean. To find this place on the map, draw an equilateral triangle with one vertex on Cape Horn and another on the Antarctic Peninsula. The third vertex in the east is our destination.
The report, An Overview of Shark Utilization in the Coral Triangle Region, examines the catch, trade and management of sharks in waters of the six Coral Triangle countries: Indonesia, Malaysia, Papua New Guinea, the Philippines, Solomon Islands, and Timor L´este, plus the neighbouring countries of Vietnam and Fiji.
It’s an unsettled kind of morning on Chedabucto Bay of Canada’s east coast. The sun is shining—it’s really quite pleasant—but there’s a brisk wind blowing from the southwest. What that translates into here in the waters between Cape Breton Island and Nova Scotia is heavy seas. We’re pounding through four to six foot swells in a 25-foot rigid hull inflatable boat.
Long after the jet lag and the first day back to work, you slip into your favorite dive T-shirt eager to keep the essence of your most recent underwater experience pulsing through your mind and body. Proudly wearing large print logos across your chest is a way of celebrating your passion for diving and sharing it with the rest of the world.
I first spoke with Sheck Exley in the summer of 1991. I had begun publishing aquaCORPS: The Journal for Technical Diving, a year earlier and I was working out of the office at Capt. Billy Dean’s dive shop in Key West, Florida, the first technical diving training center in the United States. “Technical diving”, a term we had just coined to describe this new style of diving, was just in its infancy.