Science

Refine Search

What is the function of loading dye in electrophoresis?

The difference in density forces the DNA sample to sink into the bottom of the well and prevents the sample from diffusing into the buffer. Loading dyes consist of tracking dyes that migrate with the DNA samples. Glycerol and bromophenol blue is a common mixture used to create a loading buffer. The glycerol binds to the DNA and makes it heavier, while bromophenol blue stains the DNA. An ethidium bromide solution is generally used when running a gel electrophoresis. Ethidium bromide is a chemical that can be seen under ultraviolet lighting. Ethidium bromide and other fluorescent dyes bind to DN..

Continue Reading

What does global warming mean?

The primary driving force behind global warming is the change in the chemical composition of the Earth’s atmosphere. By burning hydrocarbons, humans release elevated levels of carbon dioxide into the air. As the atmosphere’s carbon concentration goes up, the planet retains more of the heat from the sun. The process works similarly to the way a greenhouse does, which is why scientists refer to carbon dioxide as a “greenhouse gas.” Carbon dioxide is not the only greenhouse gas, but it is the most important one for humans to monitor. Methane, nitrous oxide and fluorinated gases also contr..

Continue Reading

What does closed system mean in the natural sciences?

An example of a closed system is a balloon that is heated so that the gas inside makes it expand. This is a closed system because there is no exchange of matter; just the effect of the heat (energy) on the balloon. Another example would be a piston that responds to changes in heat.\n\nBy way of contrast, an open system involves the exchange of both matter and energy. Performing a titration, or using a known solution to determine the matter of an unknown solution, is an example of an open system with the beaker serving as the system.

Continue Reading

What is the scientific name for a lava rock?

When lava flow ejects from volcanic vents, it quickly cools to form small crystals and fine-grained textures, which are characteristic of extrusive rocks. Obsidian and basalt are examples of extrusive igneous rock. Carl Rod Nave of Georgia State University explains that the cooling of magma below the Earth's surface is usually much slower, so larger crystals are able to form. These large interlocking crystals are characteristic of intrusive igneous rock, such as granite.

Continue Reading

What is an example of mountain and basin landform?

A landform refers to a feature found on the surface of the Earth that is part of the surrounding terrain. The four major landforms found on Earth are hills, plateaus, plains and mountains. In addition, there are several minor landforms such as valleys, basins, canyons and buttes. Basins are areas of land enclosed by higher land. They are often found near mountains, such as in central Idaho.

Continue Reading

How is a root hair cell adapted to its function?

A root hair cell is a very tiny extension of the root hair and is invisible to the unaided human eye. It grows from the tip of the root hair, has a diameter of between 10 to 17 micrometers and a length of 100 to 1500 micrometers. Its large surface area speeds up the absorption of water and nutrients through diffusion.\nRoot hair cells are continually formed at the tip of the root and stay alive for two to three weeks before dying. In legume plants, root hairs are involved in the formation of root nodules. After absorbing water and nutrients, the root hair cells pass these nutrients to the root..

Continue Reading

What are some arch bridge facts?

The oldest stone segmental arch bridge is the Anji Bridge, commonly known as the Zhaozhou Bridge, which is found in China. The bridge was initially constructed in 605 AD and, as of 2015, has survived over 1400 years.\nThe arch bridge design was also commonly used for bridges and in aqueducts during the Roman era.\nAn arch bridge that is constructed from stone does not require mortar in its construction. However, this means that additional support systems or scaffoldings are necessary during the construction process. Two separate segments of an arch structure do not have structural integrity on..

Continue Reading

What is the eye muscle that elevates and turns the eye laterally?

Lateral movement is known as abduction and involves the eye pulling away from the nose. For the eye to move back toward the nose, the lateral rectus needs to relax so that the medial rectus can contract. A similar action is required by the superior rectus and the superior oblique muscles to elevate and depress the eye.

Continue Reading

How do you save Mother Earth?

Saving mother earth requires the collective participation of citizens worldwide who are committed to making a long-term difference. Taking care of Mother Earth demands that each person be mindful of how their lifestyle affects the environment. Practicing water conservation and eliminating environmental pollution is important to preserve the Earth's natural materials. Recycling paper, plastics, metals and other products lowers the production of waste. Using solar energy is better than burning precious fossil fuels.\nThe average human being contributes a great amount of waste during a norm..

Continue Reading

What is the lithosphere's average temperature?

The Earth has three main layers. The innermost is the core, in the middle is the mantle, and the outermost layer is the crust, which is composed of the continents and the ocean floor. The lithosphere is made up of the crust and the brittle upper part of the mantle. The crust is broken into sections called tectonic plates. These plates are always moving, but they are doing so very slowly. When two plates collide with each other, earthquakes can happen.

Continue Reading
Showing 7151 to 7160 of 10000 (1000 Pages)