Curated Video
Energy Flow in Ecosystems
New ReviewThis video explain how energy is passed throughout an exosystem and the levels of organisms.
Curated Video
Principle of MacConkey’s Agar
MacConkeys agar Media Principle is a selective and differential media. It is selective for enteric bacteria and differentiates between lactose fermenters and lactose non-fermenters. Organisms that can break lactose produce acidic end...
Curated Video
Principle of Salt Mannitol Agar-Isolation of S.aureus (Staphylococcus isolation)
SMA is used as a selective media for the isolation of pathogenic Staphylococci. Staphylococci have the unique ability of growing on a high salt containing media. Mannitol is the fermentable carbohydrate, fermentation of which leads to...
Curated Video
Capture, Mark, Recapture Method
The Capture-Mark-Recapture (CMR) method is an ecological technique used to estimate animal population sizes by capturing, marking, releasing, and later recapturing individuals to analyze the proportion of marked specimens. This...
Curated Video
Cysteine Lactose Electrolyte Deficient Agar
Cysteine Lactose Electrolyte Deficient Agar is a differential media. It is preferred over MacConkey’s agar to differentiate between lactose fermenters and lactose non-fermenters. Organisms that can break lactose produce acidic end...
Curated Video
Speciation: Allopatric, Sympatric, Parapatric, Petripatric
A species is a group of closely related organisms capable of interbreeding and producing fertile offspring, and speciation is the evolutionary process by which new species arise. Speciation can occur through anagenesis (gradual...
Professor Dave Explains
Community Ecology and Landscape Ecology
With a better understanding of population ecology, we are ready to zoom out and look at community ecology, which involves interactions between species, as well as landscape ecology, which will broaden our understanding of ecosystems. How...
Professor Dave Explains
Population Ecology (Life Tables, Age Structure, Population Growth)
With an understanding of individual organisms, let's take a look at population ecology, which looks at the dynamics of populations of organisms. How do populations grow? How are they structured? What is their geography? There is a lot to...
Curated Video
I WONDER - What Is A Trophic Level?
This video is answering the question of what is a trophic level.
Professor Dave Explains
How Genetics Interacts with Biological Anthropology
Once the field of genetics was developed, our understanding of biology was completely transformed. How did this specifically impact the field of anthropology? From Mendel's laws to the Human Genome Project, let's learn about how our...
Curated Video
Ribosomes: structure and function
Ribosomes are cell organelles with a peculiar structure and function. In this video, will talk about many things ribosomes, especially their roles in protein production and the differences between the types of ribosomes.
Curated Video
Doctor Jorge Christiansen and Tetrahymena: Pioneering Research in Cholesterol Reduction and Health Benefits
Dr. Jorge Christiansen, an alumni of the University of Buenos Aires Medical College, has made significant contributions to science and may be in line for another Nobel Prize. His groundbreaking work with Tetrahymena, a single-celled...
Curated Video
Revolutionizing Species Classification: The DNA Barcoding Project
The video describes the development of a new classification system for all plant and animal life called DNA barcoding. This system uses a specific area of mitochondrial DNA as a unique species identifier, providing a more scientifically...
Curated Video
Cilios
Prolongaciones diminutas, como pelitos, que se encuentran en la superficie de una célula y ondean al unísono para producir movimiento.
Twig - Biología
Professor Dave Explains
Behavioral Ecology (Foraging, Parasitism, Mutualism, Mate Choice, and Social Groups)
With a better understanding of ecosystems and their habitats, we are ready to discuss behavioral ecology. This looks at how organisms interact and how this effects the ecosystem. What is foraging? What about parasitism, or mutualism? How...
Science ABC
What is Evolution: A REALLY SIMPLE and Brief Explanation
Evolution is the net change in organisms or a population over the span of many generations. This change in organisms or populations happens through DNA mutations and reconbination and is passed down to the next generation through...
Science ABC
Cellular Respiration: How Do Cells Get Energy?
Cellular respiration is the process through which the cell generates energy, in the form of ATP, using food and oxygen. The is a multistep biochemical process where food, primarily the carbohydrate glucose, is broken down to produce...
Science ABC
Are Birds Reptiles?
According to phylogenetic classification, a "reptile" is any organism descended from the original group of reptiles, which includes birds. Thus, birds are reptiles by this method of classification, much like everything that descended...
Curated Video
Biochemistry
The study of chemical reactions in living organisms, the chemistry of life. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
Curated Video
Eukaryote
Organisms whose cells contain complex membrane-bound structures, called organelles. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
Curated Video
Diploid
Diploid cells have two sets of chromosomes, one from the male parent and one from the female parent. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....
Curated Video
Haploid
A cell that has half the number of chromosomes as normal body cells, containing a single set of unpaired chromosomes. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
Curated Video
Organic molecule
Generally refers to a compound that contains carbon bonded to hydrogen and is usually associated with the carbon molecules made by living organisms. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using...