Quantum dots diffuse within living cells in a nearly two-dimensional fashion. This result, which was obtained using a new 3D microscopy technique that can track single particles, sheds fresh light on intracellular diffusion – a process that is critical for moving molecules around the cell and for mediating other important activities. According to study leader Hui Li, a biophysicist at the Chinese Academy of Sciences in Beijing and Beijing Normal University, the 2D motion he and his colleagues observed is robust and stems from the complex architectures of the flat “adherent” biological cells they studied.
Quantum dots make ideal probes for studying intracellular diffusion in living cells. They are similar in size to intracellular macromolecules and can be made to mimic biological materials relatively easily, by coating their surfaces with organic molecules. Previous studies, however, relied mainly on two-dimensional measurements of their movement, with the assumption that three-dimensional diffusion is an extension of 2D diffusion and is isotropic.</em>
Why cannot we write the entire 24 volumes of the Encyclopedia Britannica on the head of a pin? Dr. Richard P. Feynman, "There's Plenty of Room at the Bottom," said to be the seminal talk that started the concept of atomic-level engineering, soon known as nanotechnology, (named by Professor Norio Taniguchi, 1974, of the Tokyo Science University).
The intricate arrangement of base pairs in our DNA encodes just about everything about us. Now, DNA contains the entirety of “The Wonderful Wizard of Oz” as well.
A team of University of Texas Austin scientists just vastly improved the storage capacity of DNA and managed to encode the entire novel — translated into the geek-friendly language of Esperanto — in a double strand of DNA far more efficiently than has been done before. DNA storage isn’t new, but this work could help finally make it practical.
Big tech companies like Microsoft are already exploring DNA-storage technology, as the biomolecule can encode several orders of magnitude more information per unit volume than a hard drive. But DNA is particularly error-prone. It can easily be damaged and erase whatever’s stored on it.
“The key breakthrough is an encoding algorithm that allows accurate retrieval of the information even when the DNA strands are partially damaged during storage,” molecular biologist Ilya Finkelstein said in a UT Austin press release.
FIG. 1. (a) Long-legs cellar spider. (b) Reeling mechanism. (c) Manufacturing process of decorating spider silk. (d) Spider silk with dome lens placed on a dedicated holder. (e) Microphotograph of dome lens. (f) Laser scanning digital microscope system for measuring dome lens. (g) Schematic diagram of the dome lens for generating PNJ.
In this work, we thoroughly investigate the shape, size, and location of the photonic nanojets (PNJs) generated from the illuminated dome lens. The silk fiber is directly extracted from the cellar spider and used to form the dome lens by its liquid-collecting ability. The solidified dielectric dome lenses with different dimensions are obtained by using ultraviolet curing. Numerical and experimental results show that the long PNJs are strongly modulated by the dimension of the dome lens. The optimal PNJ beam shaping is achieved by using a mesoscale dielectric dome lens. The PNJ with a long focal length and a narrow waist could be used to scan over a target for large-area imaging. The silk fiber with a dome lens is especially useful for bio-photonic applications by combining its biocompatibility and flexibility.
A lattice scaffold 3D printed directly onto soft living tissue. (Courtesy: Ohio State University)
Topics: 3D Printing, Bioengineering, Biofabrication, Biology, Tissue Engineering
Tissue engineering is an emerging field in which cells, biomaterials and biotechnologies are employed to replace or regenerate damaged or diseased tissues. Currently, this is achieved by generating a biomaterial scaffold outside of the body, maturation in a bioreactor and then surgically implanting the created tissue into the patient. This surgery, however, poses the added risk of infection, increases recovery time and may even negate the therapeutic benefits of the implant.
To prevent such complications, a US research team is developing a way to fabricate 3D tissue scaffolds inside a living patient – so-called intracorporeal tissue engineering. The researchers, from the Terasaki Institute, Ohio State University and Pennsylvania State University, aim to use robotic direct-write 3D printing to dispense cell-laden biomaterials (bioinks) in a highly precise, programmable manner. The printed bioinks are delivered through minimally invasive surgical incisions and the body itself acts as the bioreactor for maturation.
Any technique used to directly print tissues inside the body, however, must meet a specific set of requirements. The biomaterial must be 3D printable at body temperature (37 °C), for example, and all procedural steps should not harm the patient. For example, current methods use UV light to crosslink the constructed tissue, which is not safe for use within the body.
To meet these requirements, the team produced a specially-formulated bioink designed for printing directly in the body. They used the hydrogel gelatin methacryloyl (GelMA) as the biomaterial, and introduced Laponite and methylcellulose as rheological modifiers to enhance printability. “This bio-ink formulation is 3D printable at physiological temperature, and can be crosslinked safely using visible light inside the body,” explains first author Ali Asghari Adib.
A game-changing technique for imaging molecules known as cryo-electron microscopy has produced its sharpest pictures yet — and, for the first time, discerned individual atoms in a protein.
By achieving atomic resolution using cryogenic-electron microscopy (cryo-EM), researchers will be able to understand, in unprecedented detail, the workings of proteins that cannot easily be examined by other imaging techniques, such as X-ray crystallography.
The breakthrough, reported by two laboratories late last month, cements cryo-EM’s position as the dominant tool for mapping the 3D shapes of proteins, say scientists. Ultimately, these structures will help researchers to understand how proteins work in health and disease, and lead to better drugs with fewer side effects.
“It’s really a milestone, that’s for sure. There’s really nothing to break anymore. This was the last resolution barrier,” says Holger Stark, a biochemist and electron microscopist at the Max Planck Institute for Biophysical Chemistry in Göttingen, Germany, who led one of the studies1. The other2 was led by Sjors Scheres and Radu Aricescu, structural biologists at the Medical Research Council Laboratory of Molecular Biology (MRC-LMB) in Cambridge, UK. Both were posted on the bioRxiv preprint server on 22 May.
“True ‘atomic resolution’ is a real milestone,” adds John Rubinstein, a structural biologist at the University of Toronto in Canada. Getting atomic-resolution structures of many proteins will still be a daunting task because of other challenges, such as a protein’s flexibility. "These preprints show where one can get to if those other limitations can be addressed,” he adds.
On March 26, 1953, American medical researcher Dr. Jonas Salk announces on a national radio show that he has successfully tested a vaccine against poliomyelitis, the virus that causes the crippling disease of polio. In 1952—an epidemic year for polio—there were 58,000 new cases reported in the United States, and more than 3,000 died from the disease. For promising eventually to eradicate the disease, which is known as “infant paralysis” because it mainly affects children, Dr. Salk was celebrated as the great doctor-benefactor of his time.
Polio, a disease that has affected humanity throughout recorded history, attacks the nervous system and can cause varying degrees of paralysis. Since the virus is easily transmitted, epidemics were commonplace in the first decades of the 20th century. The first major polio epidemic in the United States occurred in Vermont in the summer of 1894, and by the 20th century thousands were affected every year. In the first decades of the 20th century, treatments were limited to quarantines and the infamous “iron lung,” a metal coffin-like contraption that aided respiration. Although children, and especially infants, were among the worst affected, adults were also often afflicted, including future president Franklin D. Roosevelt, who in 1921 was stricken with polio at the age of 39 and was left partially paralyzed. Roosevelt later transformed his estate in Warm Springs, Georgia, into a recovery retreat for polio victims and was instrumental in raising funds for polio-related research and the treatment of polio patients.
According to the link, the trials weren't without consequence:
In 1954, clinical trials using the Salk vaccine and a placebo began on nearly two million American schoolchildren. In April 1955, it was announced that the vaccine was effective and safe, and a nationwide inoculation campaign began. Shortly thereafter, tragedy struck in the Western and mid-Western United States, when more than 200,000 people were injected with a defective vaccine manufactured at Cutter Laboratories of Berkeley, California. Thousands of polio cases were reported, 200 children were left paralyzed and 10 died.
The Salk method - created in 1954 - is to inject inert forms of the virus into the bloodstream (made inactive with formaldehyde), then the body develops defenses, or antibodies against them, however it didn't prevent the virus from thriving in the intestines. His colleague, Dr. Sabin, injected an attenuated vaccine (1961), meaning it wasn't a fully inert strain so that the gut environment could be addresses. More here. The Sabin mostly eliminated Polio in the world, but the U.S. still uses the Salk method.
April 8, 1950, Mildred Dean married Robert H. Goodwin. Mom would earn an associates degree as a PN - practical nurse, and Pop worked for Hanes Dye and Finishing as an operator, under grueling conditions and few opportunities to promote until retirement. My big sister - in grade school at the time - would come along for the ride.
1954 - the year of the Polio vaccine, was also the date of Brown vs. Board of Education, where the Supreme Court reached a non-partisan, 9-0 decision, that education in America was separate and unequal.
1961 was the year the Sabin vaccine was created, and a couple who had been married twelve years got pregnant around Thanksgiving - I would be born August of 1962. I likely was beneficiary of the Sabin method at Kate Biting Hospital in Winston-Salem, NC, also the black hospital where my mother worked.
We cannot "patent the sun." But one can be grateful for the impact of invention by Dr. Salk and Dr. Sabin on the quality of life given to everyone in my generation, and forward, and African American parents wise enough to wait for it.
People walk through Piazza Duomo in Milan on May 7th. Some restrictions were lifted this week in Italy.BY CARLO COZZOLI/SHUTTERSTOCK.
Topics: Biology, COVID-19, Mathematical Models
Though I likely look like an alarmist to some of my neighbors and most of Greensboro, I will be wearing masks for the duration of this pandemic and the release of a vaccine under hopefully, a more functional administration in 2021.
“I felt like this was pretty urgent,” said De Kai, who was born in St. Louis, and is the son of immigrants from China. “I saw the country where I grew up, where my family lives [now mostly in the Bay Area], about to face this pandemic without knowing much about something as simple as wearing a mask to protect themselves and others.” In part, this comes from a cultural difference between East Asia, where masks have been routinely worn for decades to fend off pollution and germs, and other parts of the world. This includes the U.S., where people are unaccustomed to wearing masks, and, in the past, have sometimes been insensitive, even stigmatizing East Asians, many of whom had chosen to wear them in public prior to the pandemic, and had continued the practice in the aftermath of the SARS and MERS outbreaks. (In part, this habit was meant to show other people that they were concerned about transmitting the disease—something we in the West would do well to emulate.)
De Kai’s solution, along with his team, was to build a computer forecasting model they call the masksim simulator. This allowed them to create scenarios of populations like those in Japan (that generally wear masks) and others (that generally don’t), and to compare what happens to infection rates over time. Masksim takes sophisticated programming used by epidemiologists to track outbreaks and pathogens like COVID-19, Ebola, and SARS, and blended this with other models that are used in artificial intelligence to take into account the role of chance, in this case the randomness and unpredictability, of human behavior—for instance, when a person who is infected decides to go to a beach. De Kai’s team have also added some original programming that takes into account mask-specific criteria, such as how effective certain masks are at blocking the invisible micro-droplets of moisture that spray out of our mouths when we exhale or speak, or our noses when we sneeze, which scientists believe are significant vectors for spreading the coronavirus.
Here's the ArXiv preprint paper to review. It takes ninth grade reading comprehension. What you don't understand in terms can be discerned with a search engine.
What is not "exceptional," nor greatness is the threat of "getting beat up" (M. Signorile article) that an Austin man reported saying he felt simply complying with the simple, constitutional right of wearing a mask to protect others from the spread of a lethal virus. What is not "exceptional," nor greatness: threatening a sovereign state assembly in Minnesota with armed terrorists (that's the only word that comes to mind), and making a deal amounts to quid pro quo extortion! Nor is it normal Michigan State Rep. Sarah Anthony has to enlist armed citizens to protect her as she goes about her duties of governance.
The beginning of this four decade cluster fuck started with a simple phrase that became dogma and orthodoxy for republicans by their only patron saint, Ronald Reagan:
In his inaugural address after taking the oath of office on January 20, Ronald Reagan called upon Americans to "begin an era of national renewal." In response to the serious problems facing the country, both foreign and domestic, he asserted his familiar campaign phrase: "Government is not the solution to our problem, government is the problem." He hoped that America "will again be the exemplar of freedom and a beacon of hope for those who do not have freedom."
It has thus devolved to Orange Satan's comment by Stephen-lost-to-Jews-forever-Miller, noted by Dahlia Lithwick in Slate: “This American carnage stops right here and stops right now,” was simply the inauguration of the same; a preamble to depravity. It has devolved into the irony of lock down protesters spreading the very virus they travel hundreds of miles to protest: then, take their bodies and arms back home after not social distancing from possibly asymptomatic brethren to "hug grandma." It has been government by past midnight Tweet, ineptitude on steroids, bungled pandemic response, bullying threats, racist innuendo; stoked nationalism and xenophobia. Any outside observer would say "United States" is an oxymoron, led by a fucking moron. An electoral victory won't magically solve our problems. We'll be wearing masks for a while until we get an actual treatment protocol and vaccine. "Normal" is a relative term. We haven't gone back to walking loved ones to their planes, we haven't stopped taking off our shoes nor have we repented of invasive body scans since and after 9/11. We won't go back to "normal" anymore other than science fiction, where we can travel to the past, glorified or not.
At least the mask of "exceptionalism" has permanently been removed, replaced by red hats and armed terrorists. There is no room for doubt of our full depravity. My vote in November will be to end this, and Damnatio Memoriae: a fitting end to a narcissist.
Unless there is widespread testing for COVID-19, experts warn, cases will surge as governments reopen more businesses and public spaces. But there is still a woeful shortage of diagnostic tests for coronavirus infections, because of unprecedented demand for chemicals and supplies. The U.S., for instance, does hundreds of thousands of tests a day, but that number is still far short of the millions of daily assays recommended for a safe return to normal.
Now dozens of researchers in the U.S., Israel and Germany are pursuing a strategy to dramatically increase diagnostic capacity: group tests. By pooling samples from many people into a few groups and evaluating pools rather than individuals, the scientists think they can use fewer tests on more people. This approach could lead to the faster detection of individuals who are unwitting carriers of the disease and an ability to quickly clear others who have not been infected. The strategy has been used in the past to successfully detect cases of HIV, chlamydia, malaria and influenza, and was originally conceived during World War II to test thousands of military personnel for syphilis.
“As long as we have no vaccine, we can only stop the transmission of the virus by testing and isolation of people who are infected,” says Sandra Ciesek, director of the Geothe University Frankfurt’s Institute of Medical Virology in Germany. In mid-February, she was among the first to report that people with no symptoms could spread the virus. Since then, Ciesek has been working on a pooled testing technique to identify asymptomatic carriers. The approach “is trying to do more with the same number of tests,” says Tomer Hertz, a computational immunologist at Ben-Gurion University of the Negev in Israel, who is also developing a batch-testing strategy. There is a caveat, though: as the prevalence of the infection in a community goes up, the ability to save resources through group testing goes down.
As the coronavirus outbreak roils university campuses across the world, early-career scientists are facing several dilemmas. Many are worrying about the survival of cell cultures, laboratory animals, and other projects critical to their career success. And some are reporting feeling unwelcome pressure to report to their laboratories—even if they don’t think it’s a good idea, given that any gathering can increase the risk of spreading the virus.
It’s unclear exactly how common these concerns are, but social media posts reveal numerous graduate students expressing stress and frustration at requests to come to work. “Just emailed adviser to say I am not comfortable breaking self isolation to come to lab this week. They emailed … saying I have to come in. What do I do?” tweeted an anonymous Ph.D. student on 16 March who doesn’t have essential lab work scheduled. “My health & safety should NOT be subject to the whims of 1 person. It should NOT be this scary/hard to stand up for myself.”
Many universities, including Harvard, have moved to shut down all lab activities except for those that are deemed “essential,” such as maintaining costly cell lines, laboratory equipment, live animals, and in some cases, research relating to COVID-19. But others have yet to ban nonessential research entirely.
Problem research - This involves gathering data in the form of previous written papers, published and peer-reviewed; writing notes (for yourself), summaries and reviews.
Hypothesis - This is your question asked from all the research, discussion with your adviser, especially if it's a valid question to ask or research to pursue.
Test the hypothesis - Design of experiment (s) to verify the hypothesis.
Data analysis - Usually with a software package, and a lot of statistical analysis.
Conclusion - Does it support the hypothesis?
- If so, retest several times, to plot an R squared fit of the data, so predictions can be made.
- If not, form another hypothesis and start over.
Often, conclusions are written up for peer review to be considered for journal publication. No one ever gets in on first submission - get used to rejection. Conclusions will be challenged by subject matter experts that may suggest other factors to consider, or another way to phrase something. Eventually, you get published. You can then submit an abstract to present a poster and a talk at a national conference.
It is with deep regret that we are informing you of the cancellation of the 2020 APS March Meeting in Denver, Colorado. APS leadership has been monitoring the spread of the coronavirus disease (COVID-19) constantly. The decision to cancel was based on the latest scientific data being reported, and the fact that a large number of attendees at this meeting are coming from outside the US, including countries where the CDC upgraded its warning to level 3 as recently as Saturday, February 29.
Social distancing and "shelter-in-place" slows the scientific enterprise. Science is in-person and worked out with other humans in labs and libraries. However, I am in support of this action and reducing the impact on the healthcare industry that on normal days are dealing with broken bones, gunshot wounds; cancer and childbirth surgeries with anxious, expectant mothers.
The dilemma is the forces that would reject the science behind this pandemic (and most science in any endeavor), would have us all "go back to work" after two weeks. The curve we're trying to flatten could sharply spike. The infection rates would increase and otherwise healthy people would be stricken. Immunodeficient groups would start getting sick again ...dying again. Our infrastructure is not designed for that many sick or dead people. Science continues with our survival and societal stability.
The persons with the solutions might be chomping-at-the-bit at home for now. Survival insures science will continue ...someday.
I shopped and bought the supplies you see above for the suggested "hunker down." It's the most I've ever purchased at one time in a grocery store. Missing from the pile of food, meat and cleaning supplies is hand sanitizer and toilet paper. Amazon is out, with delivery projections of off-brand toilet paper mid April, according to a college friend on lock down in California. Though I don't own a dog anymore, I observed dog food was missing from the shelves. The city is on limited hours from 10 am to 3 pm. The suggested crowd assemblies dwindled swiftly from 500 - 300 - 100 to 10 or less. There will likely be no spring commencement. Susan Rice was to be our keynote speaker, and I was going to attend to congratulate newly-minted Doctors of Philosophy.
My classes went online almost immediately through Blackboard. It was kind of cute to see my professors struggling and fully admitting they've never taught an online class before. The fact that they were lecturing was a departure from previous experiences, typically PowerPoint slides uploaded to Canvas (another college app), chapters read and a test proctored. That was my experience with it before. There's a video app: Zoom that I used to view a Ph.D. defense and a seminar on writing. My tiny house seems at comparison to my mobility before, smaller ...
I took a walk today in the neighborhood. Teleworking tends to drive one "stir crazy." I saw a family that lives across the street from me playing with her son in the street. She was accompanied by her brother, his girlfriend, her kids and their mother. The brother and his family had moved into the neighborhood. I said hello, mouthing a few brief remarks. I was friendly ...at a distance.
I continued walking.
A jogger passed by me on my right. A couple walked by on my left: I spoke briefly. I still walked.
A neighbor said "did anyone tell you you look like Charles Barkley?" I smiled: I've heard it before, and said "I wish I had his salary!" We laughed. I said it ...at a distance.
I continued walking.
A read on my phone about a few young spring breakers determined to party in Florida, full of the invulnerability of youth. They're not practicing social distancing, or good sense.
Italy passed a grim marker in the number of infected and deaths. I'm sure we're trying not to copy-exact this aspect of what was the Roman Empire in these modern times where the globe is no longer vast, and the oceans not the barriers they once were.
Columbus Day may not get as much attention as our other holidays, but scientists are still fascinated by what Christopher Columbus’ arrival meant for the “New World” and how it shaped where we are today.
“It was a culture clash, obviously,” said OMRF President Stephen Prescott, M.D. “But it also launched a clash of infectious diseases.”
Columbus and other visitors from Europe lived in agrarian societies and cities, he said. The viruses and bacteria that develop in farming and when large groups of people live together are different from those in a more nomadic society, like the American Indians.
Think about swine flu and bird flu, Prescott said. We’re always on the lookout for viruses that pass from humans to animals, mutate DNA, and then return to humans.
“Well, that didn’t just start last year. So long as humans have been raising livestock, we’ve been passing viruses back and forth,” he said. “When explorers from Europe reached the Americas, they brought livestock and they brought diseases and the result was devastating.”
In Hispaniola, Columbus’ first stop in the Americas, the native Taino population (an indigenous Arawak people) had no immunity to new infectious diseases, including smallpox, measles and influenza. There were an estimated 250,000 indigenous people in Hispaniola in 1492. By 1517, only 14,000 remained.
The conversation that hasn't been had: we're seeing not just the impact of a zoological virus from bat to human, we're seeing the impact of a globalization protocol that's been in place since 1492. The bats are in China, but bats are on every continent. The trade agreements we've negotiated for cheap labor also meant the ones in charge of the labor pool ignored (or, weren't pressed to follow) OSHA and safety regulations we take for granted. The "chickens [were eventually going to] come home to roost" because human society as far as temporal considerations is episodic. We think of the quarter, the end-of-year, the holiday push and financial goals higher than last years. We think of stock dividends and investor sentiments; use bailout money to buy back stocks and artificially pump up the value of their companies. This selloff on Wall Street has simply been an adjustment from the previous superfluous bullshit. My trip to Texas to see our granddaughter, relatives and friends; my wife's annual girlfriends' trip, our sons trip to Greensboro have all been put on hold indefinitely to flatten the curve.
I walked alone ...home, continuing social distancing.
Note: As I'm getting my sea legs in online classes, the blog will post not at the normal times because these aren't normal times. My karate instructor from undergrad is a cancer survivor: his doctor has him in isolation as COVID-19 can be exacerbated by immunodeficient systems. In addition, his wife and daughter just came back from overseas and are in isolation. He has relatives visiting him, though.
A brief I wrote my first year of graduate school for a class called Nano Safety (excerpt):
From an article in Nature: Education, it posits that viruses are not ‘alive’ in a sense they don’t have metabolic processes, one of the four criteria for life (“organized, metabolism, genetic code, and reproduction”) as discussed in class, 24 August 2017. There are three possible mechanisms to origins. The Progressive Hypothesis: “bits and pieces” of a genome gained the ability to move in and out of cells (retroviruses like HIV given as an example). The Regressive Hypothesis: meaning the viruses evolved from some common ancestor to their current state. The Virus-First Hypothesis: that viruses existed before mortals as “self-replicating units.”
My wife and I suffer allergies during this time of year. Out of an abundance of caution, we attempted to have her tested for COVID-19. The doctor surmised she didn't have any symptoms of Coronavirus, but the inventory of test kits from the CDC is what really troubled me: ONE. Only if you meet the stringent requirement of damned-near death's door will anyone get the test. Then, the doctor will order another SINGULAR test.
In response to the COVID-19 pandemic, the Allen Institute for AI has partnered with leading research groups to prepare and distribute the COVID-19 Open Research Dataset (CORD-19), a free resource of over 29,000 scholarly articles, including over 13,000 with full text, about COVID-19 and the coronavirus family of viruses for use by the global research community.
This dataset is intended to mobilize researchers to apply recent advances in natural language processing to generate new insights in support of the fight against this infectious disease. The corpus will be updated weekly as new research is published in peer-reviewed publications and archival services like bioRxiv, medRxiv, and others.
Topics: Biology, NASA, International Space Station, Space Exploration
The procedure to ensure that astronauts don't bring an illness to the International Space Station is under evaluation as NASA enacts tactics to help slow the spread of the novel-coronavirus disease COVID-19.
Governments and agencies around the world have been enacting measures meant to contain the spread of the novel coronavirus; those measures include social distancing and quarantines for people who think they may have been exposed to the virus. But these tactics aren't new territory for NASA astronauts, who take such measures to prepare for close-quarter, secluded living that can last six months or longer.
Professor George Washington Carver, Tuskegee University, History.com
Topics: African Americans, Biology, Diversity, Diversity in Science, Nanotechnology
Part of being in nanotechnology is you get to exercise a bit of creativity and invention. Research is about looking into an area that people know something about, reading a LOT of papers and formulating your own ideas about an approach to a subject. You may either fail miserably at first, or successfully bring about something novel.
George Washington Carver I'm referring to as a proto nanotechnologist. Planting peanuts, soy and sweat potatoes replaced nitrogen other plants like cotton leached from the soil. Though this crop rotation method (introduced by Carver) gave the farmers high yields on the produce they were used to selling, it had the unintended consequence of giving them a surplus of produce for which, there had previously been no market. Carver would go on to invent 300 uses for the peanut, one of which, peanut butter he surprisingly DIDN'T, though I'm sure you've eaten unless you have allergies. If it weren't for him, the farmers in the south would have gone out of business due to a boll weevil infestation that decimated cotton throughout the south. It was a fortuitous confluence of events.
George Washington Carver was an agricultural scientist and inventor who developed hundreds of products using peanuts (though not peanut butter, as is often claimed), sweet potatoes and soybeans. Born an African American slave a year before slavery was outlawed, Carver left home at a young age to pursue education and would eventually earn a master’s degree in agricultural science from Iowa State University. He would go on to teach and conduct research at Tuskegee University for decades, and soon after his death his childhood home would be named a national monument — the first of its kind to honor an African American.
Born on a farm near Diamond, Missouri, the exact date of Carver’s birth is unknown, but it’s thought he was born in January or June of 1864.
Nine years prior, Moses Carver, a white farm owner, purchased George Carver’s mother Mary when she was 13 years old. The elder Carver reportedly was against slavery, but needed help with his 240-acre farm.
When Carver was an infant, he, his mother and his sister were kidnapped from the Carver farm by one of the bands of slave raiders that roamed Missouri during the Civil War era. They were sold in Kentucky.
Moses Carver hired a neighbor to retrieve them, but the neighbor only succeeded in finding George, whom he purchased by trading one of Moses’ finest horses. Carver grew up knowing little about his mother or his father, who had died in an accident before he was born.
A team of researchers have built what they claim to be the first living robots. The “xenobots,” they say, can move, pick up objects, and even heal themselves after being cut.
The team is hoping the biological machines could one day be used to clean up microplastics in the ocean or even deliver drugs inside the human body, The Guardian reports.
To build the robots, the team used living cells from frog embryos and assembled them into primitive beings.
“These are novel living machines,” research co-lead Joshua Bongard, robotics expert at the University of Vermont, said in a statement. “They’re neither a traditional robot nor a known species of animal. It’s a new class of artifact: a living, programmable organism.”
The millimeter-length robots were designed by a supercomputer running an “evolutionary algorithm” that tested thousands of 3D designs for rudimentary life forms inside a simulation. The scientists then built a handful of the designs, which were able to propel themselves forward or fulfill a basic task inside the simulation using tweezers and cauterizing tools.
The tiny robots had about a week to ten days of “power” courtesy of living heart muscle cells that were able to expand and contract on their own.
This scanning electron microscope image was taken of artificial “protocells” created at Argonne’s Center for Nanoscale Materials, which have the ability to convert light to chemical energy through the use of a light-harvesting membrane. (Image by Argonne National Laboratory.)
Topics: Alternative Energy, Battery, Biology, Green Tech, Nanotechnology
By replicating biological machinery with non-biological components, scientists have found ways to create artificial cells that accomplish a key biological function of converting light into chemical energy.
In a study from the U.S. Department of Energy’s (DOE) Argonne National Laboratory, scientists created cell-like hollow capsule structures through the spontaneous self-assembly of hybrid gold-silver nanorods held together by weak interactions. By wrapping these capsules’ walls with a light-sensitive membrane protein called bacteriorhodopsin, the researchers were able to unidirectionally channel protons from the interior of the artificial cells to the external environment.
“Nature uses compartmentalization to accomplish biological functions because it brings in close vicinity the ingredients needed for chemical reactions,” said Argonne nanoscientist Elena Rozhkova, a corresponding author of the study. “Our goal was to replicate nature, yet use inanimate materials to probe how cells accomplish their biological tasks.”
"Extraordinary claims require extraordinary evidence." Carl Sagan
I'm guessing "I did Ancestry" is going to become the "I used to do Amway" in the 21st Century?
I participated, thinking it was legitimate science. It did somewhat jive with my own experiences of being consistently identified by Nigerians as resembling someone from the Igbo. This again is pure conjecture, and likely only a polite guess.
I can see the desire to know about our roots, especially if you're a part of the African Diaspora is tempting as well as an opportunity for confidence rackets and quackery.
In the spring of 2017, a college student named Mary spit into a tube and sent it to the DNA testing company Ancestry, which analyzed it and sent back a breakdown of her family history.
But Mary wanted to know more. The human genome contains, in theory, an extraordinary wealth of pre-programmed information about who we are and who we might become: whether she was at risk for the same types of cancer that killed her parents, for instance, or if she had medical conditions she could unknowingly pass on to her children.
For that information, Mary — we’re withholding her last name to protect her privacy — turned to a dubious new sector of the genomics industry, in which startups claim to provide vastly greater insights than prominent companies like Ancestry and 23andMe do. She uploaded a copy of her raw genetic code, which Ancestry provided as a 17.6 megabyte text file, to a site called Genomelink, which advertises tests for everything from medical conditions and mental illnesses to ludicrously specific personality traits including “loneliness,” “social communication problems,” and “vulnerability to helicopter parenting.”
But when her results arrived, Mary immediately noticed that many were “wildly inaccurate.” Genomelink said she was “less easily depressed,” but Mary was diagnosed with clinical depression at a young age. The startup predicted that she had a peanut allergy, but Mary told Futurism that “peanut butter is one of the true loves of my life.” Other errors in Mary’s report included traits like blood iron levels, body fat measurements, hearing problems, height, and skin complexion.
“I felt that much of it was off-base and unhelpful,” she told Futurism, “as it didn’t fit me at all.”
Genomelink is just one of a growing number of shady DNA testing startups now operating in the regulatory Wild West of commercial genomics.
There’s GenePlaza, for instance, which sold a DNA test that claimed to predict users’ sexual preferences — and still sells tests that purport to measure intelligence and risk of depression. A company called Soccer Genomics claims to examine a child’s DNA to create a sports training regimen to turn them into the perfect soccer player. An outfit called GenoPalate told a Milwaukee Journal Sentinel reporter that their DNA demanded a diet of elk meat and passion fruit. A venture called Vinome claims it can recommend the perfect wine for each person based on their genetic code.
The problem, according to experts, is that these companies are promising information about DNA with a granularity that even scientists can’t deliver. Deanna Church, a geneticist at the biotech company Inscripta, told Futurism the tests are “all equally useless.”
“There is not a scientific basis for this sort of testing,” she said. “I certainly would not recommend anyone spend any money on this sort of thing.”
A private DNA ancestry database that’s been used by police to catch criminals is a security risk from which a nation-state could steal DNA data on a million Americans, according to security researchers.
Security flaws in the service, called GEDmatch, not only risk exposing people’s genetic health information but could let an adversary such as China or Russia create a powerful biometric database useful for identifying nearly any American from a DNA sample.
GEDmatch, which crowdsources DNA profiles, was created by genealogy enthusiasts to let people search for relatives and is run entirely by volunteers. It shows how a trend toward sharing DNA data online can create privacy risks affecting everyone, even people who don’t choose to share their own information.
“You can replace your credit card number, but you can’t replace your genome,” says Peter Ney, a postdoctoral researcher in computer science at the University of Washington.
Ney, along with professors and DNA security researchers Luis Ceze and Tadayoshi Kohno, described in a report posted online how they developed and tested a novel attack employing DNA data they uploaded to GEDmatch.
Though the movie poster is an attempt at dark humor, I do agree with the science. We're in a time of our history where science is being suborned to political and economic considerations, when we need it literally for survival.
From a biological perspective, there is no such thing as devolution. All changes in the gene frequencies of populations--and quite often in the traits those genes influence--are by definition evolutionary changes. The notion that humans might regress or "devolve" presumes that there is a preferred hierarchy of structure and function--say, that legs with feet are better than legs with hooves or that breathing with lungs is better than breathing with gills. But for the organisms possessing those structures, each is a useful adaptation.
Chief among these misconceptions is that species evolve or change because they need to change to adapt to shifting environmental demands; biologists refer to this fallacy as teleology. In fact, more than 99 percent of all species that ever lived are extinct, so clearly there is no requirement that species always adapt successfully. As the fossil record demonstrates, extinction is a perfectly natural--and indeed quite common--response to changing environmental conditions. When species do evolve, it is not out of need but rather because their populations contain organisms with variants of traits that offer a reproductive advantage in a changing environment.
Nearly a quarter of a million science teachers are hard at work in public schools in the United States, helping to ensure that today’s students are equipped with the theoretical knowledge and the practical know-how they will need to flourish in tomorrow’s world. Ideally, they are doing so with the support of the lawmakers in their state’s legislatures. But in 2019 a handful of legislators scattered across the country introduced more than a dozen bills that threaten the integrity of science education.
It was a mixed batch, to be sure. In Indiana, Montana and South Carolina, the bills sought to require the misrepresentation of supposedly controversial topics in the science classroom, while in North Dakota, Oklahoma and South Dakota, their counterparts were content simply to allow it. Meanwhile, bills in Connecticut, Florida and Iowa aimed beyond the classroom, targeting supposedly controversial topics in the state science standards and (in the case of Florida) instructional materials.
Despite their variance, the bills shared a common goal: undermining the teaching of evolution or climate change. Sometimes it is clear: the one in Indiana would have allowed local school districts to require the teaching of a supposed alternative to evolution, while the Montana bill would have required the state’s public schools to present climate change denial. Sometimes it is cloaked in vague high-sounding language about objectivity and balance, requiring a careful analysis of the motives of the sponsors and supporters.
Either way, though, such bills would frustrate the purpose of public science education. Students deserve to learn about scientific topics in accordance with the understanding of the scientific community. With the level of acceptance of evolution among biomedical scientists at 99 percent, and the level of acceptance of climate change among climate scientists not far behind at 97 percent, it is a disservice to students to misrepresent these theoretically and practically important topics as scientifically controversial.
Tyche: Modern Greek: [ˈti.çi] "luck"; Roman equivalent: Fortuna) was the presiding tutelary deity who governed the fortune and prosperity of a city, its destiny. In Classical Greek mythology, she is the daughter of Aphrodite and Zeus or Hermes. Source: Wikipedia
Dust from the breakup of a 150-kilometer- (93 mile) diameter asteroid may have caused — or at least intensified — an ice age half a billion years ago, providing the impetus for a sweeping array of aquatic animal adaptations that shaped today's spectacularly diverse ocean ecosystems, according to a new study published in the September 20 issue of Science Advances.
The authors uncovered extraterrestrial material in sediments that correlate the timing of asteroid breakup with a major dip in sea level frequently attributed to the onset of the Mid-Ordovician ice age. Their findings suggest that asteroid dust may have settled in Earth's atmosphere, shading the planet from the sun's radiation and cooling global temperatures.
While extraterrestrial dust only accounts for about one percent of the modern atmosphere and does not impact the climate, large quantities of dust lingering for several hundred thousand years or more would be expected to cause global cooling.
"This is the first time anyone has shown that asteroid breakups and asteroid dust can lead to ice ages," said Birger Schmitz, a professor of geology at Lund University in Sweden and the first author of the study. "This is also the first time since the discovery of the asteroid impact that killed the dinosaurs that an important event in the history of life has been tied to an astronomical event."