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Title          
adorable extremophiles 
   
 
Abstract
Hank explains why NASA and the European Space Agency are in love with tardigrades and how these extremophiles are helping us study the panspermia hypothesis.
 
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Added By - samriddha
Subject - Biology
Document Type - Documentary
Video Duration - moderate
 
 
 

 

Title          
Post-copulatory sexual selection and sexual c... 
   
 
Abstract
Male pregnancy in seahorses, pipefishes and sea dragons (family Syngnathidae) represents a striking reproductive adaptation that has shaped the evolution of behaviour and morphology in this group of fishes1. In many syngnathid species, males brood their offspring in a specialized pouch, which presumably evolved to facilitate male parental care5, 6. However, an unexplored possibility is that brood pouch evolution was partly shaped by parent–offspring or sexual conflict, processes that would result in trade-offs between current and future pregnancies. Here we report a controlled breeding experiment using the sexually dimorphic Gulf pipefish, Syngnathus scovelli, to test for post-copulatory sexual selection within broods and for trade-offs between successive male pregnancies as functions of female attractiveness. Offspring survivorship within a pregnancy was affected by the size of a male’s mate, the number of eggs transferred and the male’s sexual responsiveness. Significantly, we also found that embryo survivorship in a current pregnancy was negatively related to survivorship in the prior pregnancy, clearly demonstrating fitness trade-offs between broods. Overall, our data indicate that post-copulatory sexual selection and sexual c...
 
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Added By - autocrawler
Subject - Biology
Document Type - Journal Paper Discussion
Video Duration - moderate
 
 
 

 

Title          
Whales originated from aquatic artiodactyls i... 
   
 
Abstract

In this video, Hans Thewissen and Lisa Cooper from the Northeastern Ohio Universities College of Medicine discuss their paper entitled "Whales originated from aquatic artiodactyls in the Eocene epoch of India", published in the Nature (Vol 450 Issue 7173 20 December 2007). Their co-authors include Mark Clementz, Sunil Bajpai and B.N.Tiwari.

Although the first ten million years of whale evolution are documented by a remarkable series of fossil skeletons, the link to the ancestor of cetaceans has been missing. It was known that whales are related to even-toed ungulates (artiodactyls), but until now no artiodactyls were mo...

 
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Added By - autocrawler
Subject - Biology
Document Type - Journal Paper Discussion
Video Duration - moderate
 
 
 

 

Title          
Carl Sagan on Human Brain 
   
 
Abstract

Carl Sagan on Human Brain.

Carl Edward Sagan, Ph.D. (November 9, 1934 - December 20, 1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series  

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Added By - 123
Subject - Biology
Document Type - Documentary
Video Duration - 00:10:52
 
 
 

 

Title          
The wonders of a tiny cell 
   
 
Abstract
a brief animation of one of the few things that happend in a cell. Thats when we start to scratch on the surface of some true complex systems.

The cell is the structural and functional unit of all known living organisms. It is the smallest unit of an organism that is classified as living, and is often called the building block of life.[1] Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as humans, are multicellular. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm; a typical cell mass is 1   

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Added By - 123
Subject - Biology
Document Type - Computer Simulations
Video Duration - 00:02:50
 
 
 

 

Title          
Live Cell Video Microscopy 
   
 
Abstract
Cellular message movement was captured on this video. Such steps are required for controlled cell growth -- otherwise, cancer and other diseases can result.
 
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Added By - 123
Subject - Biology
Document Type - Demonstration
Video Duration - 00:05:25
 
 
 

 

Title          
Translation 
   
 
Abstract

Eukaryotic translation (animation). Eukaryotic translation is the process by which messenger RNA is translated into proteins in eukaryotes. It consists of initiation, elongation and termination [1]

Initiation of translation usually involves the interaction of certain key proteins with a special tag bound to the 5'-end of an mRNA molecule, the 5' cap. The protein factors bind the small ribosomal subunit (also referred to as the 40S subunit), and these initiation factors hold the ...

 
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Added By - 123
Subject - Biology
Document Type - Definition
Video Duration - 00:03:30
 
 
 

 

Title          
CritterCam - Penguins on the Roll 
   
 
Abstract

The following information has been copied from the National Geographic website. "National Geographic's Crittercam is a research tool designed to be worn by wild animals. It combines video and audio recording with collection of environmental data such as depth, temperature, and accelerationThese compact systems allow scientists to study animal behavior without interference by a human observer. Combining solid data with gripping imagery, Crittercam brings the animal's point of view to the scientific community and a conservation message to worldwide television audiences. For more than a decade Crittercam has given us insight into the lives of whales, sharks, seals and sea lions, sea turtles, penguins, manatees, and other marine animals. In 2002 the first prototype of a terrestrial Crittercam (designed for land animals) survived its maiden voyage on a wild African lion, opening the door to a whole new world of animal-borne imaging research. The video was recorded during a presentation of Corey Jaskolski (National Geographics) with consent.

 
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Added By - A Ghosh
Subject - Biology
Document Type - Documentary
Video Duration - 00:01:57
 
 
 

 

Title          
CritterCam - Caming the Whale 
   
 
Abstract

Crittercam is a small package of instruments including a camera that can be attached to a wild animal to study its behaviour in the wild.

Crittercam is a small package of instruments including a camera that can be attached to a wild animal to study its behaviour in the wild. Crittercam was invented by National Geographic marine biologist Greg Marshall and has been employed in studies on over 40 marine and terrestrial animals.

The smallest animal yet to carry Crittercam is the Emperor Penguin. Information and footage from Crittercam was used in the Oscar-winning documentary March of the Penguins.

http://www.nationalgeographic.com/crittercam/about.html

 

 
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Added By - A Ghosh
Subject - Biology
Document Type - Demonstration
Video Duration - 00:00:49
 
 
 

 

Title          
Blood: Path of a Red Blood Cell 
   
 
Abstract

Red blood cells are the most common type of blood cell and the vertebrate body's principal means of delivering oxygen from the lungs or gills to body tissues via the blood.


Human red blood cellsRed blood cells are also known as RBCs, haematids or erythrocytes (from Greek erythros for "red" and kytos for "hollow", with cyte nowadays translated as "cell"). RBCs should more properly be referred to as "corpuscles" rather than "cells", as a cells contains a nucleus while mature RBCs in mammals do not.

A schistocyte is a red blood cell undergoing fragmentation, or a fragmented part of a red blood cell.

Erythrocytes consist mainly of hemoglobin, a complex molecule containing heme groups whose iron atoms temporarily link to oxygen molecules in the lungs or gills and release them throughout the body. Oxygen can easily diffuse through the red blood cell's cell membrane. Hemoglobin also carries some of the waste product carbon dioxide back from the tissues. (In humans, less than 2% of the total oxygen, and most of the carbon dioxide, is held in solution in the blood plasma). A related compound, myoglobin, acts to store oxygen in muscle...

 
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Added By - 123456
Subject - Biology
Document Type - Documentary
Video Duration - 00:00:02
 
 
 

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