background preloader

Our Secret Universe

Our Secret Universe
Related:  General Biology

The Biology Project What If All 7.1 Billion People Moved To Tunisia? I’ve always been interested in the distribution of the human population across the globe. It’s far from an even spread—this map shows where people are most squished in (dark colors) and where they’re spread out (light colors): And the East Asian countries in particular are so jam-packed with people that there’s this insane fact: (Parts of Malaysia and Indonesia have been intentionally left out—without them, the red regions still contain more than 50.2% of the world’s population.) To gain perspective on just how differently people are living on this planet, I looked up the average population density of a particular city, state, or country, and imagined all humans living at that density. (While we’re here—if all the habitable land on Earth were as dense as Manhattan, you could fit 1.73 trillion people on the planet.

EnergyDrinksLesson.pdf Extract DNA from your Halloween pumpkin. Click on the photo for a larger image. Towards the end of October we start seeing lots of recipes for pumpkin this and pumpkin that. This one is different. We're going to extract the DNA from a pumpkin. What you need: A pumpkin. What we do with all that stuff Cut the pumpkin into small chunks that fit in the blender. Add about a half cup of water to the pumpkin chunks, and a tablespoon of salt. Now we add a whole bunch of dishwashing detergent. Next we filter the puree using the coffee filter and funnel. Now it is time to get the liquor out of the freezer. For this part, a shot-glass would be appropriate. Pour some of the filtered pumpkin juice into the container. Now, tilt the container and very gently pour some of the alcohol slowly so that it forms a layer on top of the juice, and does not mix. After a few seconds, you will see a ghostly layer of DNA form between the juice and the alcohol. Pumpkin is made of water, cellulose, sugars, proteins, salts, and DNA.

How does caffeine affect the body? Biologist Neal J. Smatresk--Dean of the College of Science at the University of Texas at Arlington--offers this explanation: Caffeine--the drug that gives coffee and cola its kick--has a number of physiological effects. Historically, cAMP was the first second messenger ever described. Thus, when caffeine stops the breakdown of cAMP, its effects are prolonged, and the response throughout the body is effectively amplified. Caffeine would be expected to have this effect on any animals that used these neurotransmitters to regulate their heartbeat. Terrifying images from the microscope (16 pictures These spectacular images were captured using a variety of traditional micrioscoape. The world they show is terrifying! When viewed up close beneath the unblinking eye of the microscope, the tiniest mites and most harmless of insects become terrifying beasts that haunt your dreams. Image 1 of 16 Chicken embryo \nSource: Tomas Pais de Azevedo/Nikon / via: Hydrothermal worm Source: Philippe Crassous / via: Mosquito eye Source: Oliver Meckes / via: Marine worm Source: Philippe Crassous / via: fei_company Maggot Image by EYE OF SCIENCE/SPL/BARCROFT MEDIA/LANDOV A head lice clinging to a human hair A head lice clinging to a human hair A wasp’s head Swollen tick Water bear Source: Oliver Meckes / via: Water mite Source: Nicole Ottawa / via: fei_company Eyelash mite Embryonic Zebrafish Source: David McCarthy / via: Caterpillar Cleptoparasitic Bee Source: Jerome Rozen and Glenn Hall / via: The face of an ant Source: Stephen Lyth / via: st-stev

How do you cite website material that has no author, no year, and no page numbers? Because the material does not include page numbers, you can include any of the following in the text to cite the quotation (from pp. 170–171 of the Publication Manual): A paragraph number, if provided; alternatively, you could count paragraphs down from the beginning of the document. An overarching heading plus a paragraph number within that section. A short title in quotation marks, in cases in which the heading is too unwieldy to cite in full. Because there is no date and no author, your text citation would include the title (or short title) "n.d." for no date, and paragraph number (e.g., "Heuristic," n.d., para. 1). The entry in the reference list might look something like this: Heuristic. (adapted from the sixth edition of the APA Publication Manual, © 2010) Because the material does not include page numbers, you can include any of the following in the text to cite the quotation (from pp. 170–171 of the Publication Manual): Heuristic. Heuristic.

100 Weird Facts About the Human Body 100 Weird Facts About the Human Body Friday, April 2, 2010 at 5:23pm by Site Administrator The human body is an incredibly complex and intricate system, one that still baffles doctors and researchers on a regular basis despite thousands of years of medical knowledge. As a result, it shouldn’t be any surprise that even body parts and functions we deal with every day have bizarre or unexpected facts and explanations behind them. From sneezes to fingernail growth, here are 100 weird, wacky, and interesting facts about the human body. The Brain The human brain is the most complex and least understood part of the human anatomy. Nerve impulses to and from the brain travel as fast as 170 miles per hour. Hair and Nails While they’re not a living part of your body, most people spend a good amount of time caring for their hair and nails. Facial hair grows faster than any other hair on the body. Internal Organs The largest internal organ is the small intestine. Bodily Functions Sex and Reproduction

Writing in Psychology: Experimental Report Writing Summary: Written for undergraduate students and new graduate students in psychology (experimental), this handout provides information on writing in psychology and on experimental report and experimental article writing. Contributors:Dana Lynn Driscoll, Aleksandra KasztalskaLast Edited: 2013-03-11 09:54:55 Experimental reports (also known as "lab reports") are reports of empirical research conducted by their authors. You should think of an experimental report as a "story" of your research in which you lead your readers through your experiment. As you are telling this story, you are crafting an argument about both the validity and reliability of your research, what your results mean, and how they fit into other previous work. These next two sections provide an overview of the experimental report in APA format. General-specific-general format Experimental reports follow a general to specific to general pattern. Title page Experimental reports in APA format have a title page. Crafting your story

The 2013 Microscope Images of the Year The yawning trap of a carnivorous plant has taken First Prize in the 2013 Olympus BioScapes Digital Imaging Competition. Igor Siwanowicz, a researcher from the Howard Hughes Medical Institute captured the fascinating photo. The confocal image was selected from more than 2100 entries. In addition to the Top 10 award-winning recipients, 69 Honorable Mentions received recognition this year, including 55 still images and 14 movies. Next year’s competition, which closes September 30, 2014 is already open for participants. 1st Place Igor Siwanowicz Open trap of aquatic carnivorous plant, humped bladderwort (Utricularia gibba). 2nd Place Dorit Hockman A lateral view of a black mastiff bat embryo (Molossus rufus), at the “Peek-a-boo” stage when its wings have grown to cover its eyes. 3rd Place Dr. A composite image showing a collection of single-cell fresh water algae, desmids. 4th Place Spike Walker Stained transverse section of a lily flower bud. 5th Place Dr. 6th Place Kurt Wirz 8th Place Dr.

How the kidney works Each kidney contains about a million tiny structures called nephrons. A nephron has a cup-shaped Bowman's capsule leading into the renal tubule. The two sections of each nephron extend across the two different regions of the kidney: the Bowman's capsules are found within the outer cortex regionthe renal tubules run from the cortex into the darker medulla How does the kidney balance the blood? Placed end to end, the nephrons of one kidney would stretch about 8 km. A branch of the renal artery supplies the nephrons with blood. | wildlife, science, awesome Cell Membrane Structure and Function The Plasma Membrane fluid mosaic model, semi-permeable (selectively permeable), double layer of phospholipids with embedded proteins Jobs of the cell membrane Isolate the cytoplasm from the external environment Regulate the exchange of substances Communicate with other cells Identification Phospholipids (fats) contain a hydrophilic head and a nonpolar hydrophobic tail, which creates a barrier. Cholesterol - stiffens the membrane by connecting phospholipids Glycolipids - signal molecules Glycoproteins - have an attached chain of sugar (antibodies) Proteins embedded in membrane serve different functions 1. Transport Across Membrane -The membrane is selectively permeable (also called semipermeable ) - Small particles, or particles with no charge can pass through the bilayer (carbon dioxide and oxygen) - Water has a charge, does not easily cross the membrane - a channel protein, Aquaporin helps water across Passive Transport Osmosis - diffusion of water Solutions: Hypertonic | Isotonic | Hypotonic