By: John Welford
Anton van Leeuwenhoek is often credited as being the inventor of the microscope, but that is not actually the case. It would also be unfair to remember him for that and that alone, because his contributions to microbiology were far more extensive and important. He...
By: Debbie Luyo
Gene expression is defined as the transcription of a gene's DNA to messenger RNA, or mRNA, which is in turn translated into amino acids, the building blocks of proteins. Proteins are responsible for the millions of molecular reactions that take place in the cells of...
By: Sage Doak
How spiders catch their preySpiders use a multitude of techniques to capture prey. Most people will be aware of web building spiders and hunting spiders, but there other techniques spiders use which include ambushing and even fishing.Web BuildingSpiders build different kinds of webs based...
By: Keith Hamburger
Plant sap serves much the same purpose as blood does for animals, carrying water and nutrients throughout the plant.Higher order animals, vertebrates in particular, use blood to carry nutrients to cells and carry waste products from cells. In animals, nutrients come in through the...
By: Randy Crum
Evolution is unavoidable. Therefore human evolution is unavoidable.There is evidence that humans are still evolving. For example some 700 relatively new genes have been discovered in the human genome just within the last 5000 to 15,000 years. (See http://www.nytimes.com/2006/03/07/science/07evolve.html.)...
What is cloned beef?
By: Heather Youngs
This month (May 2008), the FDA approved the cloned beef for human consumption. The technology, developed by companies such as Viagen (Australia) and SEK genetics (USA) was developed in 2003 and has been used for breeding show animals. Although there was a voluntary moratorium on...
Is the Human Race Evolving or Devolving
By: Gerhard Adam
In discussing this question I have elected to use the following definition of "devolve" which is to "degenerate or deteriorate gradually". As such, the question carries the connotation that evolution is positive, while devolution is negative.As has been pointed out by several writers already...
By: Alicia M Prater PhD
Cytoskeletal proteins make up the cytoskeleton of a cell, which is the basic structural framework providing the cell a shape and providing internal transport pathways, aiding in cell division, and performing functional tasks, such as motion. The cytoskeleton is traditionally thought to occur only in...
By: Gerhard Adam
To consider the next phase of human evolution requires that we spend some time thinking about the selection pressure humans face. Starting about 10,000 years ago, humans began a major departure from simple biological evolution by the introduction of agriculture. From this point, human...
By: Richard G. Lanzara
In Search of Memory, is a wonderful book by Dr. Eric Kendal, which contains major threads of discovery and growth that interweave throughout this fascinating book making it a very personal and intense scientific journey into the heart and history of understanding how we know...

 

1 103 104 105 106 107 371