Cell Biology 2B Intro to Cells Continued, Ultrastructure of Cells.notebook
Introduction to Cells Continued and Ultrastructure of Cells
January 30, 2015
Gene Expression and Cell Differentiation
All Cells have the same set of genes- the genes that are used determine differentiation
Example
- rod cells (pigment to absorb light)
- lens (no pigment)
Genes for pigmentation only used in rod cells
Extra "instruction manual" for all cells
25,000 genes in human genome, but most cells less than half will be used
itshumour.blogspot.com
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When a gene is being used, it is being "expressed" can make proteins* Cell differentiation occurs because a unique sequence of genes is expressed for each cell type
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Cell differentiation in olfactory receptors
Each cell expresses only one
"smell"
gene-- why we can detect so many kinds of smells
Stem Cells
Life begins when a sperm fertilizes an egg
zygote
Cell division occurs- 2, 4, 8, 16...
In these early stages of cell division and embryonic development, large amounts of undifferentiated tissue is formed- all other tissues stem from these
These cells begin to differentiate as the embryo develops. catalog.flatworldknowledge.com Jan 30-9:52 AM
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Cell Biology 2B Intro to Cells Continued, Ultrastructure of Cells.notebook
January 30, 2015
Significance of STEM cells
Stem cells can divide over and over to make large quantities of new cells- can help replace cells that have been lost or damaged
Can differentiate in several ways to produce many different cell types www.systembio.com Jan 30-9:42 AM
Therapeutic Uses
re-grow skin- burn victims replace lost/malfunctioning cells- Type I
Diabetes
potential to replace whole organs hearts, kidneys, etc.
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As cells develop, they eventually are forced to differentiate, and choose a certain pathway...BUT...
Some cells stay stem cells into adulthood, valuable for repair!
Ex) bone marrow, skin, liver, brain, kidney, heart
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Electron Microscopes
Have a much higher resolution than light microscopes
Resolution = making the separate parts of an object distinguishable by eye
Light microscopes, cells can be seen
> Max resolution = 200 nm (*400)
Electron microscopes, ultrastructure can
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various parts of a business on one another. • Grow an awareness of competition. • Take away practical know-how to improve the effectiveness of your business. Why Simulate • • • • • Risk Free View Alternative Strategies Enjoyable Compresses Time (1 Round=1Year) Integration SENSOR INDUSTRY OVERVIEW The Marketplace Customers (manufacturers) need sensors for their products Initially one segment, now breaking into five Very different customer demands developing between the segments Diversification…
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2014 Mondays, Wednesdays, & Thursdays 10:30am-11:35 am Blackman Auditorium (Ell Hall) Professor: Junauro Landgrebe Office: 337 Ryder Phone: 617.373.7473 Email: J.Landgrebe@neu.edu (email is preferred) Office Hours: Wednesdays 12 PM – 1 PM or by appointment Teaching Assistant: Brian Bergeron Email: RockHistoryTA@gmail.com Course Objective: The objective of Rock Music is to examine the origins of the style and trace it’s evolution from the popular music styles of the 1920’s…
Lectures so far…Weeks 1-4 Lectures so far…Weeks 4-6 Corporate objective = Maximise firm value What you need to measure value? – Type of cash flow How to measure value? – Bond value = 1 1 (1 r ) t VB C F r 1 r – Timing of the cash flow t – Riskiness of the cash flow – Share value= – Firm value = – Project value = Dn P0 n n 1 1 R Capital Budgeting: Evaluation Step 1: Forecast cash flows Ct V t t 1 1 r N NPV …
Getting the Most from Lectures Description of this Guide This guide examines ways of improving your organisation and thinking while taking down information at speed. You are asked to take stock of why you may not be getting the most out of lectures to encourage you to be a more reflective and interactive learner. The guide looks at how you can prepare effectively before lectures and where you should be looking for resources. Different ways of taking down information are explored so that…
