Essays Tagged: "cells"

Development of the Human Zygote

single-celled zygote, smaller than a grain of sand, transforms into an amazingly complex network of cells, a newborn infant. Through cellular differentiation and growth, this process is completed with ... re not.The impressive process of differentiation changes a single-cell into a complicated system of cells as distinct as bold and bone. Although embryonic development takes approximately nine months, ...

(10 pages) 251 0 4.1 Nov/1994

Subjects: Science Essays > Biology > Human Biology

Cloning Today

ell. Most of the work with clones is done from cultures. An embryo has about thirty or forty usable cells but a culture features an almost endless supply. When the nucleus has been inserted into the e ... n era of laboratory cloning began in 1958 when F.C. Steward cloned carrot plants from mature single cells placed in a nutrient culture containing hormones. The first cloning of animal cells took place ...

(4 pages) 190 0 3.8 Dec/1996

Subjects: Science Essays > Genetics & Genome Projects

Immunodeficiency viruses researched by Jacek Skowronski

ral protein Nef. This protein plays an important role in the initiation of AIDS. T lymphocytes, the cells that are worn-out in AIDS, are cultured to study the affects the viruses have on them. The res ... ce is characterized as AIDS.To study the function of Nef, he uses genetic molecules to identify the cells involved in affecting the T lymphocyte. He also studies SIV-infected monkeys to find the impor ...

(1 pages) 39 0 4.1 Mar/2002

Subjects: Humanities Essays > Health & Medicine


r important mineral. Thismineral is in most foods. It is very important in containinghealthy mussel cells. It also helps in forming bones.Sodium is another kind of mineral. Sodium is usuallyfound in s ... y cause edema. It may also give youhigh blood pressure.Iron is needed to form pigments in red blood cells. Thesecells transport the oxygen we need. men have more iron inthere blood stream then women. ...

(1 pages) 53 0 4.0 Oct/1996

Subjects: Science Essays > Biology

The Immune System

The immune system is a group of cells, molecules, and tissues that help defend thebody against diseases and other harmful invaders. ... nse. Any agent perceived asforeign by a body's immune system is called an antigen. Several types of cells may beinvolved in the immune response to antigens.When an antigen enters the body, it may be p ... act together with the complement system. The human immune system containsapproximately 1 trillion T cells and 1 trillion B cells, located in the lymphoid organs and inthe blood, plus approximately 10 ...

(3 pages) 157 1 3.4 Oct/1996

Subjects: Humanities Essays > Health & Medicine

Growth Dynamics of E. coli in Varying Concentrations of Nutrient

th dynamics of E. coli in varying media was to determine which media produces the maximum number of cells per unit time. First a control was established for E. coli in a 1.0x nutrient broth. This was ... loramphenicol. A variety of OD readings were taken and calculations made to determine the number of cells present after a given time. Then two graphs were plotted, Number of cells per unit volume vers ...

(10 pages) 88 0 4.6 Apr/1997

Subjects: Science Essays > Biology

How changes in the atmosphere, eukarotes, and multicellularity have occured and influenced life on earth

ATP production gained a strong advantage, and so they began to prosper and increase. Some of these cells may have evolved into modern forms of aerobic bacteria. Other cells may have become symbionts ... ve evolved into modern forms of aerobic bacteria. Other cells may have become symbionts with larger cells and evolved into mitochondria. As the amount of oxygen and other atmospheric gasses increased, ...

(2 pages) 79 1 3.2 Mar/1996

Subjects: Science Essays > Atmospheric Sciences

Treating Diabetes with Transplanted Cells

angerhans, was not being produced in diabetes patients. This hormone, called insulin, enables other cells to take up sugar glucose from the blood for energy. Diabetes patients who were not making insu ... t be rejected.This has been attributed to the theory that it takes two signals for host white blood cells to attack foreign agents. These two signals are sent by the passenger luekocytes. Unfortunatel ...

(5 pages) 66 0 3.0 Feb/1997

Subjects: Humanities Essays > Health & Medicine > Diseases

Cystic Fibrosis

conductance regulator (CFTR). A protein controls the flow of chloride ions into and out of certain cells. In healthy people, CFTR forms a channel in the plasma membrane so chloride ions can enter and ... ealthy people, CFTR forms a channel in the plasma membrane so chloride ions can enter and leave the cells lining the lungs, pancreas, sweat glands, and small intestine. In people with cystic fibrosis, ...

(4 pages) 141 1 4.2 May/2002

Subjects: Science Essays

"Color Blindness"

yellow. All other colors are theresults of different combinations of primary colors. Special visual cells, called cones, are respon-sible for our ability to see color. People with normal vision have t ...

(3 pages) 71 0 3.7 Dec/1996

Subjects: Science Essays > Biology > Human Biology

This is a general essay regarding cancer. The topic was to research and write about cancer.

Cancer is a group of diseases that begin in cells, the building blocks of life. Cells are essential parts of the body, and when they are damaged ... parts of the body, and when they are damaged they can cause many problems. Under normal conditions, cells grow and divide to produce more cells when the body needs them. However, sometimes, these cell ... coming back. Benign tumors are rarely threatening to the body. Malignant tumors are cancer and the cells in these tumors are abnormal, dividing without any sort of control or order. The cells can spr ...

(6 pages) 303 1 4.9 Jun/2002

Subjects: Science Essays > Biology > Human Biology

DNA Fingerprinting

t can be done in six steps. The first step is to isolate the DNA. The DNA must be obtained from the cells or tissues of the body for example: blood, hair or skin is effective. The second step is to us ...

(1 pages) 109 1 3.3 Jun/2002

Subjects: Science Essays > Biology > Human Biology

Cancer. Describes three types of outpatient cancer treatments.

ot fully comply with the parts of the cell that control the growth and functions of the cell. These cells eventually become abnormal growths and can be recognized as not normal tissue. These traits ar ... gents used to treat cancer are carcinogenic. Even though these chemicals break the DNA of cancerous cells, which kills them, it also induces cancer in normal cells. Some hormones created in humans can ...

(6 pages) 156 0 3.6 Jan/1996

Subjects: Humanities Essays > Health & Medicine > Diseases

Life-span development chap 4 notes

ation - attachment of the zygote to the uterine wall (10 days after conception)* Blastocyst - inner cells (embryo)* Trophoblast - outer layer (placenta/umbilical cord - life supports systems)B.Embryon ... onic Period - 2 to 8 weeks after conception1. Cell differentiation intensifies, support systems for cells form and organs appears2. Attached zygote becomes embryo* Endoderm (digestive/respiratory syst ...

(2 pages) 66 0 3.7 Sep/2002

Subjects: Social Science Essays > Psychology


must be carried inside the organism by some means and then transported through body fluids, to the cells.As the virus reproduces itself, the copies, are released from the cell and infect other cells. ... mical make up of a cell. This change usually damages or kills the cell, and disease results if many cells are infected.The Ebola (pronounced ee-BOH-la) virus is an extremely lethal virus from the trop ...

(5 pages) 87 1 4.6 Dec/1996

Subjects: Science Essays > Biology


P BiologyMr. CantorPeriods 3B-4CLONINGCloning is the production of a group of genetically identical cells or organisms, all descended from a single individual. The members of a clone have the same cha ... urally, but cloning can also be the result of biotechnology - "the harnessing of microbes and other cells to produce useful materials and facilitate industrial processes" - or more specifically geneti ...

(2 pages) 55 0 3.0 Feb/1997

Subjects: Science Essays > Genetics & Genome Projects

Nucleic Acids and Protein Synthesis; Outline

Outline on Iportant subjects in DNA and RNA -Nucleic Acids and Protein Synthesis7-1 DNACells 'know' how to how to produce ATP, how to build cilia and centrioles, howto produce membranes a ... ow to build cilia and centrioles, howto produce membranes and enzymes.A program, or code, in living cells must be able to duplicate itself quickly andaccurately and must also have a means of being dec ... . The work genetic refersto anything that relates to heredity. The genetic code is the way in which cells storeprogram that they seem to pass from one generation to another.TransformationWhen a strain ...

(6 pages) 89 0 4.3 Dec/1996

Subjects: Science Essays > Genetics & Genome Projects

All about cancer.

y. Even though there are so many, the have one characteristic in common: the uncontrolled growth of cells.How do you get cancer?Normally, cells duplicate constantly: one cell becomes two, these two be ... mes two, these two become four, and these four become eight, then sixteen, 32 and so on. As the new cells form, the old cells die. But, for reasons still unknown, approximately every million divisions ...

(8 pages) 170 0 3.2 Oct/2002

Subjects: Science Essays > Biology


earned some new stuff from that reportBiologyCell ReportDamn near everything there is to know about cells:There are many parts of a cell, they all have specific duties, and are all needed to continue ... of a cell, they all have specific duties, and are all needed to continue the life of the cell. Some cells exist as single-celled organisms that perform all of the organism's metabolism within a single ...

(5 pages) 138 0 3.0 Aug/1996

Subjects: Science Essays > Biology


ve been defined as 'entities whose genomes are elementsof nucleic acid that replicate inside living cells using the cellularsynthetic machinery, and cause the synthesis of specialised elements thatcan ... tic machinery, and cause the synthesis of specialised elements thatcan transfer the genome to other cells.' They are stationaryand are unableto grow. Because of all these factors, it is debatable whet ...

(3 pages) 85 0 4.6 Apr/1996

Subjects: Science Essays > Biology