Combination locks : I forgot the combination! How many combinations will I have to try?
This activity asks the student to find the number of possible combinations for a lock showing the numbers 0 to 39. It is part of the Figure This! collection of 80 online mathematical challenges emphasizing real world uses of mathematics. The solution to the combination question applies the technique of using a smaller number of possible arrangements to study a problem. Students learn to use a tree diagram to model possible outcomes and explore the mathematical meaning of the term combination. Th
Author(s): National Council of Teachers of Mathematics (NCTM)

Three forces on a glider
A glider is a special kind of aircraft that has no engine. Paper airplanes are the most obvious example, but gliders come a wide range of sizes. Toy gliders, made of balsa wood or Styrofoam, are an excellent way for students to study the basics of aerodynamics. This resource discussed the historical applications of the glider design, its comparison to powered air vehicles, and its ability to generate lift. Copyright 2005 International Technology Education Association
Author(s): Tom Benson

Middle School Portal: Math and Science Pathways (MSP2)
Students study the design of a remote control and re-design it to make it more ergonomically correct. Copyright 2005 International Technology Education Association
Author(s): Teachnet.com

Wireless Networking in the Developing World
The massive popularity of wireless networking has caused equipment costs to continually plummet, while equipment capabilities continue to increase. By applying this technology in areas that are badly in need of critical communications infrastructure, more people can be brought online than ever before, in less time, for very little cost. We hope to not only convince you that this is possible, but also show how we have made such networks work, and to give you the information and tools you need to
Author(s): No creator set

VRoma Project
This is a community of teachers and students who help to create online resources for teaching Latin and ancient Roman culture and who use these resources in their courses. Students and instructors can interact live and share resources for the study of the ancient world.
Author(s): No creator set

Ten Activities to Consider Before Developing Your First Online Course
Many educators have asked me what they can do to prepare before they formally begin to develop an online course. Becoming familiar with the online learning environment and knowing how to create web pages can give you a head start in developing your course.Consider preparing with one or more of the 10 activities presented.
Author(s): No creator set

Online Poetry Classroom
"Songs My Teacher Taught Me," created by Teaching Fellow Anthony Consiglio, is a series of three lesson plans intended to guide students through approximately one month of poetry study. This unit involves minimal technology requirements but extends across a wide range of poetry. Of the eighteen poets included; eight are women, six are African-American; two are nineteenth-century poets and the three lesson plans are thematically broken into "What is Poetry?", "Poems of Childhood," and "Self and S
Author(s): No creator set

Information and telecommunications regulations and trends
The basic study material (compiled and aggregated from various sources and revised and in part written by Petrus H Potgieter) for a course Information and telecommunications regulations and trends at the University of South Africa (Unisa), available under the GnuFDL license. It discusses standards, the basics of telecommunications - including interconnect pricing - and industry issues. There is some emphasis on the South African context, but the largest part of the material is not country-specif
Author(s): No creator set

Dynamic Remodeling of Individual Nucleosomes Across a Eukaryotic Genome in Response to Transcription
The eukaryotic genome is packaged as chromatin with nucleosomes comprising its basic structural unit, but the detailed structure of chromatin and its dynamic remodeling in terms of individual nucleosome positions has not been completely defined experimentally for any genome. We used ultra-highâ€“throughput sequencing to map the remodeling of individual nucleosomes throughout the yeast genome before and after a physiological perturbation that causes genome-wide transcriptional changes. Nearly 80%
Author(s): No creator set

Cotton: Building a Better Plant
Plant genome research is already revolutionizing the field of biology. Currently, scientists are unlocking the secrets of some of the most important plants in our lives, including corn, cotton and potatoes. Secrets of Plant Genomes: Revealed! takes viewers on a lively, upbeat journey that explores how these plants got to be the way they are and investigates how we can make better use of them in the future. Plant scientists are hard at work--in the lab, in the field and at the computer--to increa
Author(s): No creator set

Corn: The Dynamic Genome
Plant genome research is already revolutionizing the field of biology. Currently, scientists are unlocking the secrets of some of the most important plants in our lives, including corn, cotton and potatoes. Secrets of Plant Genomes: Revealed! takes viewers on a lively, upbeat journey that explores how these plants got to be the way they are and investigates how we can make better use of them in the future. Plant scientists are hard at work--in the lab, in the field and at the computer--to increa
Author(s): No creator set

Aberrant mucin assembly in mice causes endoplasmic reticulum stress and spontaneous inflammation res
Background MUC2 mucin produced by intestinal goblet cells is the major component of the intestinal mucus barrier. The inflammatory bowel disease ulcerative colitis is characterized by depleted goblet cells and a reduced mucus layer, but the aetiology remains obscure. In this study we used random mutagenesis to produce two murine models of inflammatory bowel disease, characterized the basis and nature of the inflammation in these mice, and compared the pathology with human ulcerative colitis.
Author(s): No creator set

ABCD's of MELANOMA
ABCD's of Melanoma. Malignant Melanoma is the most aggressive of malignant cutaneous tumours. Cases with lymphonode involvement, and distant metastases, carry a very poor prognosis, (50% and 20% respectively alive in 5 years), while those presenting without evident lymphonode involvement have a much better survival rate (60% alive in 5 years). It is therefore extremely important to do early malignant melanoma diagnosis. There are several criteria that may lead to the diagnosis of a malignant m
Author(s): No creator set

A semaphorin code defines subpopulations of spinal motor neurons during mouse development.
In the spinal cord, motor neurons (MNs) with similar muscle targets and sensory inputs are grouped together into motor pools. To date, relatively little is known about the molecular mechanisms that control the establishment of pool-specific circuitry. Semaphorins, a large family of secreted and cell surface proteins, are important mediators of developmental processes such as axon guidance and cell migration. Here, we used mRNA in situ hybridization to study the expression patterns of semaphorins
Author(s): No creator set

Symptoms of Posttraumatic Stress Disorder in a New Orleans Workforce Following Hurricane Katrina
On August 29, 2005, Hurricane Katrina made landfall resulting in catastrophic damage and flooding to New Orleans, LA, and the Gulf Coast, which may have had significant mental health effects on the population. To determine rates and predictors of symptoms consistent with a diagnosis of posttraumatic stress disorder (PTSD) in New Orleans residents following Hurricane Katrina, we conducted a web-based survey 6 months after Hurricane Katrina made landfall. Participants included 1,542 employees from
Author(s): DeSalvo, Karen B.,Hyre, Amanda D.,Ompad, Danielle

Attitudes Toward HIV Protease Inhibitors and Medication Adherence in an Inner City HIV Population
The objective of this pilot study was to examine attitudes toward protease inhibitors (PIs) among HIV-infected individuals and to assess the relationship between PI attitudes and adherence to PIs. Respondents were recruited from four AIDS service organizations in New York City; the total sample consisted of 97 HIV-infected individuals who were taking a PI. The sample consisted largely of African Americans and Latinos from inner city areas, and most had a low level of education. Adherence was sub
Author(s): Demmer, Craig

GeoMaths MathHelp Material
This site provides students with mathematics self-study material which is embedded within the context of the geosciences. The material consists of many MathHelp "notebooks" covering specific mathematical topics related to a relevant geological context, such as plate velocity or cliff erosion. The notebooks contain explanations, illustrations, and examples. A mathematical glossary is also constantly available, providing a brief explanation of mathematical keywords and links to the relevant notebo
Author(s): No creator set

The Study of Metals and Alloys by X-ray Powder Diffraction Methods
The object of this lesson is to introduce research students with no previous experience to the basic ideas of the use of the powder method for the study of metals and alloys.
Author(s): No creator set

1850?: Joseph Slocum, Portrait
This image is a portrait of Joseph Slocum, father of Margaret Olivia Slocum Sage. He is wearing a dark suit with a brocade waistcoat, a white shirt, and a dark cravat. His left hand rests inside his jacket, and his right arm is held away from his body, perhaps resting on a shelf or table.,This portrait shows the Hon. Joseph Slocum, Olivia's father. His career included, in addition to the business ventures documented here, one term as New York State Representative for his district -- a bribe, it
Author(s): Unknown

Fort Raleigh National Historic Site Teacher's Page
Roanoke Revisited supplements concepts in core curricula courses and provides teachers and their students with appropriate information for the study of pre-colonial America. Although each classroom teacher is likely to find multiple uses for the materials, the suggested method for implementation is through the use of peer-counseling techniques and experiential activities.
Author(s): No creator set