Horse's Hoof Clam--An Overview
This short video gives excellent real life footage of a Horse's Hoof Clam. Students will enjoy listening to the ocean sounds as they watch the close up views of this amazing invertebrate. A member of the giant clam family (Tridacnidae), the horse’s hoof clam (Hippopus hippopus) is named for the shape of its shell. Reddish bands on the outer side of the shell give it its alternative common name of ‘strawberry clam’.As in all clams, the body of the horse’s hoof clam is
Lesvoorbereiding drama : Spaghetti en trollen Dit is een dramales over trollen en spaghetti. De les kan ook verder uitgewerkt worden in een les bewegingsexpressie.
Matt, Mathematics -- 60 Second Impressions
The '60 Second Impressions' are a series of one-minute films featuring current Cambridge undergraduate students . These students talk about what it's really like to study at Cambridge, live in a College, and take part in a wide range of extra-curricular activities.
Matt is from Derby, and is studying Mathematics. In his 60 Second Impression, he talks about how he has benefited from receiving a Cambridge bursary, being involved in the theatre scene, and what he likes about his College.
To fin
El Partenón como modelo architectonic - video en español
Descripción escrita por Arte Historia.
Los arquitectos neoclásicos tomarán como modelo constructivo uno de los edificios emblemáticos de la antigüedad: el Partenón, levantado en el siglo V antes de Cristo por Iktinos y Kallikrates en la Acrópolis
ateniense para albergar la estatua de Atenea Partenos, modelada en oro y marfil por Fidias. En Francia Soufflot utiliza este esquema para la construcción de la iglesia d
UAPD Welcomes New Explosive, Firearm Detection Canine
After eight years on the force and more than 450 assignments, the University of Arizona Police Department retired its first bomb-detection canine, Michael. Taking his place is Toby, a 2-year-old black labrador retriever. Toby is certified by the National Police Canine Association in explosive and firearm detection.
Alexis Sullivan
Sullivan and Dr. Chitwood discuss her recent heart surgery.
2.2 Present-day energy use Global annual consumption of all forms of primary energy increased more than tenfold during the 20th century (Author(s):
3.3.1 Dormancy in black and brown bears The dormant state of bears differs from true hibernation in that the body temperature does not fall below 31–35° C and a major disturbance (such as an intruding biologist) can arouse them to full activity in a few minutes. Dormant bears do not eat, drink, urinate or defaecate, the heart rate drops from 50–60 beats min−1 to 8–12 beats min−1, and oxygen consumption is only 32% of that of actively foraging bears. Nonetheless, the rate of protein turnover, as mea
3.3 Bears Brown or grizzly bears (Ursus arctos), and black bears (U. americanus) feed throughout the summer on grass, fruit, nuts, fish, small mammalian prey and carrion. In autumn, all brown and black bears fatten rapidly before entering caves or hollow trees where they become dormant for weeks or months. The terms ‘hibernation’ and ‘torpor’ are sometimes used to describe this state in bears. To avoid confusion with true hibernation, this phenomenon is here called ‘dormancyâ
3.2 Penguins Penguins (order Sphenisciformes) are an ancient and distinctive group of flightless, short-legged birds that evolved in the Southern Hemisphere, probably around New Zealand, about 65 Ma ago in the late Cretaceous, although the oldest known fossils date from about 45 Ma ago. At a maximum body mass of more than 40 kg, the emperor penguin (Aptenodytes forsteri;Figure 10a) is the largest living penguin (some fossil species were much bigger) and is found further south than any other v
3.1 Introduction It is clear from Sections 1 and 2 that seasonal or irregular periods of fasting are an integral part of living at high latitudes, especially for large animals. When people (and many tropical and temperate-zone mammals) lose weight, either because they are eating less or because they are suffering from a digestive or metabolic disorder, protein is broken down in substantial quantities long before the lipid stores are exhausted. Even frequent and vigorous exercise cannot prevent the breakdown o
2.4.1 Summary of Sections 1 and 2 Large seasonal changes in temperature and sunlight dominate primary plant production and hence the food supply. Food intake is regulated by the endogenous seasonal control of appetite, fattening and activity, as well as by food availability. Energetically demanding activities such as breeding and migration are only feasible during a brief period and must be tightly synchronized to season. Greater accessibility of food suitable for chicks makes long-distance migration to and from high arctic r
2.4 Variable fecundity The food supply for most polar species depends on several unpredictable factors so successful breeding is far from certain, even if births are tightly synchronized with the seasons. Maintaining pregnancy and feeding the offspring after birth (or hatching in birds) are energetically expensive. The death of the offspring before its maturity represents an irredeemable loss of ‘reproductive investment’ for the parents, particularly the mother, although the earlier in parental nurturing that t
2.3 Environmental regulation of breeding As pointed out in Section 1.1, primary plant productivity occurs for only a few months in the summer, so the reproductive physiology of most arctic animals, particularly herbivorous species, is tightly synchronized with the seasons. On Svalbard (Figure 2b), more than 90% of the reindeer fawns are born in the first week of J
2.2 Migration for breeding Birds do not hibernate, but like reindeer, many species undergo daily or seasonal changes in energy expenditure and appetite, and many of the endocrine changes that are an integral part of true hibernation in other groups. The fact that the preliminary stages of hibernation are widespread among vertebrates may help to explain why true hibernation has evolved several times in distantly related taxa. Instead of hibernating, some species of birds migrate to and from breeding areas, where they ar
2.1 Nutrient budgeting All plants and animals respond to environmental changes such as the light–dark cycle and temperature, but the impact of the environment on essential physiological processes such as eating, fattening and breeding is more evident and often more finely controlled in polar species than in those that are native to warmer and more equable habitats. Large effects are nearly always easier to quantify and to investigate experimentally, so arctic species offer an excellent opportunity to study the su
1.2 The polar environment At high latitudes, the Sun's rays always strike the Earth at a large angle from the vertical so they travel through a thicker layer of atmosphere and are attenuated by the time they reach the ground. Because the Earth's axis of rotation is inclined to its path around the Sun, there are large seasonal changes in daylength and the Sun is continuously below the horizon for a period in winter and continuously above the horizon for an equivalent period in summer. The annual changes in daylength an
1.1 Preamble This unit is about animals' structural and physiological adaptations to living permanently in cold climates; hibernation, a special response to transient or seasonal cold, is described in the openlearn unitAnimals at the extremes: hibernation and torpor (S324_2). Living in a polar climate involves adaptations of many physiological systems: appetite, diet, energy storage and reproductive habits as well as thermoregulation. In many cases, such changes involve ‘ordinary’ physio
Learning outcomes By the end of this unit you should be able to: define and use, or recognize definitions and applications of each of the bold terms; outline the special features of the polar regions as a habitat and list some contrasts between the Arctic and the Antarctic; describe some effects of daylength on feeding, fat deposition and reproduction in arctic animals; explain why the environmental controls of appetite, activity level and fecun
