Blooming prickly pear cactus (Opuntia) from the Sonora desert
Cacti are often overlooked as flowering plants. In fact, cacti bloom with colorful flowers and reproduce like all other angiosperms.
One reason why mites are considered to be arachnids is because they don't have wings and they cannot fly. Mites are so tiny that most of them have to be viewed under a microscope to be seen.
Female Artemia closeup
Close-up full body view of a female Artemia under one quarter-inch in size.
Land snails are invertebrates because they do not have a backbone. They are related to water snails, but they do not live in water.
EPTOMS Ozone (7-26-96 - 12-4-00)
This animation shows the total ozone as measured by Earth Probe TOMS since the earliest measurements by that instrument. Days on which no data was taken appear as blank.
Numerical Simulation of Magnetic Flux Emerging Through a Model Solar Atmosphere: Density
This animation is one of a series depicting the results of a two-dimensional ideal magneto-hydrodynamic simulation of magnetic flux emerging through a solar atmosphere. The simulation has a resolution of 300x500 cells and a length scale of 16 Mm x 6.8 Mm. The simulation depicts 1730 seconds in the evolution of the model.
A 3-Dimensional Model of the Magnetosphere (WMS)
The earths magnetosphere protects the earth from high-energy charged particles coming from the sun. Some charged particles are deflected by the magnetosphere, while others become trapped and produce the aurora. This presentation shows a 3-dimensional model of the magnetosphere. The features that it highlights are flat ribbons representing the paths of charged particles deflected by the magnetosphere, triangular ribbons representing magnetic field lines, and colored surfaces representing constant
Great Zoom into Siberia
Using data from different spacecraft and some powerful computer technology, visualizers at the Goddard Space Flight Center present you with a collection of American cities in a way you have never seen them before. Starting with our camera high above the Earth, we rush in towards the surface at what would be an impossible speed for any known vehicle. Passing though layers of atmosphere, the colors of our destinations shimmer with their own unique characteristics, and suddenly we find ourselves fl
Pearl River, China (with window)
Zoom down to land reclamation from the river delta. Dissolve between data collected in 1988, 1992, and 1995.
El Nino-La Nina Sea Surface Temp and Height Anomaly 3D Isometric View: January 1997 through November
An animation of sea surface temperature and height anomalies in the Pacific for January 1997 through November 1998 from NOAA AVHRR and TOPEX Poseidon
MODIS Snow Cover over Europe
The Moderate Resolution Imaging Spectroradiometer (MODIS) provides data in 36 spectral bands, some of which are used in an algorithm to map global snow cover. The animation shows the dynamic behavior of the advance and retreat of continental snow cover over Europe for the winter of 2001-02 from MODIS-derived 8-day composite snow maps with a spatial resolution of about 5 km.
Ozone Layer Shielding Our Planet
An animation showing the ozone layer shielding our planet from the suns intense ultraviolet radiation. Ozone absorbs nearly all of the biologically damaging UV radiation from the sun.
1992 Daily Ozone from Nimbus-7
In this animation of total ozone, the luminance values of the colors bounding areas of missing data are used in interpolating over these regions. The missing data are mapped to the grayscale portion of the color map.
Clouds over Florida from GOES-11: August 4, 2000
This animation is one of a series showing the first data from GOES-11. The data shown was taken at one-minute intervals.
AIRS Volumetric Cloud Data (Fly In)
This visualization shows Aqua-AIRS simulated volumetric cloud data for September 13, 1999. The data was created using the Finite Volume Community Climate Model (FVCCM). Temperature and cloud data sets were match rendered for cross dissolves in post production. This visualization was created as a part of the Aqua prelaunch package.
Ethics of Human Subject Research
Ethics of Human Subject Research (2 credits) is offered by the Department of Health Policy and Management and the Distance Education Division, Johns Hopkins Bloomberg School of Public Health and The Phoebe R. Berman Bioethics Institute, Johns Hopkins University. The course introduces students to the ethics of human subject research. Ethical theory and principles are introduced, followed by a brief history of research ethics. Topics covered in lectures and moderated discussions include informed c
Essentials of Probability and Statistical Inference IV: Algorithmic and Nonparametric Approaches
Introduces the theory and application of modern, computationally-based methods for exploring and drawing inferences from data. Covers re-sampling methods, non-parametric regression, prediction, and dimension reduction and clustering. Specific topics include Monte Carlo simulation, bootstrap cross-validation, splines, local weighted regression, CART, random forests, neural networks, support vector machines, and hierarchical clustering. De-emphasizes proofs and replaces them with extended discussi
The History of Public Health
In the History of Public Health we will examine the historical experience of health and illness from a population perspective. This material seeks to reveal how the organization of societies facilitates or mitigates the production and transmission of disease. It also asks how do populations and groups of individuals go about securing their health? One key theme is the medical management of space in one form or another - from the public space of the environment through institutional spaces such a
Statistical Reasoning I
Statistical Reasoning in Public Health provides an introduction to selected important topics in biostatistical concepts and reasoning through lectures, exercises, and bulletin board discussions. It represents an introduction to the field and provides a survey of data and data types. Specific topics include tools for describing central tendency and variability in data; methods for performing inference on population means and proportions via sample data; statistical hypothesis testing and its appl
Problems in the Design of Epidemiologic Studies (Grant Writing)
Presents the methodologic and logistic problems involved in designing and conducting epidemiologic studies. Students participate in the preparation of a research protocol for a study in a human population. Offers an opportunity to critically evaluate the adequacy and scientific merit of research protocols, develop an appreciation of the ethical aspects of conducting research involving human subjects, and apply methods and principles learned in earlier (340.601 - 603) and current courses to speci