A new study demonstrates that macrophages can effectively substitute for so-called dendritic cells as primers of T-cell-dependent immune responses. They instead stimulate a broader-based response.
The immune response, the process by which the adaptive immune system reacts to, and eliminates foreign substances and cells, depends on a complex interplay between several different cell types. So-called dendritic cells, which recognize and internalize invasive pathogens, play a crucial role in this process.
Since it was revealed that Andreas Lubitz – the co-pilot who purposefully crashed Germanwings Flight 9525, killing 150 people – had been treated for psychiatric illness, a debate has ensued over whether privacy laws regarding medical records should be less strict when it comes to professions that carry special responsibilities.
It has been widely argued that Germany’s privacy laws were to blame for the tragedy. The Times, for example, headlined an article: “German obsession with privacy let killer pilot fly.” Similarly, another article published in TIME said “German privacy laws let pilot ‘hide’ his illness from employers.”
Stone tools, shaped by striking a stone "core" with a piece of bone, antler, or another stone, provide some of the most abundant evidence of human behavioral change over time. Simple Oldowan stone flakes are the earliest things considered tools, dating back 2.6 million years, and the Late Acheulean hand axe goes back 500,000 years.
While it's relatively easy to learn to make an Oldowan flake, the Acheulean hand axe is harder to master, due to its lens-shaped core tapering down to symmetrical edges.
Though some studies have linked icebergs to abrupt climate change cycles during the last glacial period - by introducing fresh water to the surface of the ocean and changing ocean currents, which changes climate - new findings present a contradictory narrative and suggest that icebergs generally arrived too late to trigger marked cooling across the North Atlantic.
Abrupt climate change, characterized by transitions between warm and cold conditions across the North Atlantic, is a pervasive feature of the Late Pleistocene - the most recent period of repeated glacial cycles.
To modern cultural sensibilities, "Victorian" means 'repressed' because it seemed overly formal to people that want to wear flip-flops into the office, yet they clearly got some things right.(1)
The name derives from the reign of Queen Victoria in the United Kingdom in the latter half of the 19th century, a time when England ruled the western world culturally and every region militarily. The Victorian Era brought with it with the creation of a paid police force(2) rather than the local constable system that had been around since the Tudors. (3)
Source: University of Liverpool
Thermoluminescence is used on sediment 'grains', which function as natural radiation dosimeters when buried with defects or impurities, to determine age. The valid range is 1,000 to 500,000 years and the technique is used extensively in archeology and earth sciences to date artifacts and rocks.
E-cigarettes, battery-powered devices that heat a liquid nicotine solution, have been sold in the United States since 2007 and are marketed as an option to help smokers kick the habit. Instead of a nicotine patch or chewing gum, e-cigarette users inhale the vapor.
It's obviously safer than smoking but anti-cigarette advocates in the United States of America are also against this 'vaping' because of the presence of cigarette companies as investors. Originally, smoking awareness was to get people to get rid of smoking but a campaign against a smoking cessation product means it is more of a desire to get rid of certain companies.
A systematic review of the genomes of patients with ALK-negative anaplastic large cell lymphoma (ALCL), a particularly aggressive form of non-Hodgkin's lymphoma, shows that many cases of the disease are driven by alterations in the JAK/STAT3 cell signaling pathway. The study also demonstrates, in mice implanted with human-derived ALCL tumors, that the disease can be inhibited by compounds that target this pathway, raising hopes that more effective treatments might soon be developed.
A team of astronomers studied the simultaneous collision of four galaxies in the galaxy cluster Abell 3827 and could trace out where the mass lies within the system and compare the distribution of the dark matter with the positions of the luminous galaxies.
Although dark matter cannot be seen, the team could deduce its location using a technique called gravitational lensing. The collision happened to take place directly in front of a much more distant, unrelated source. The mass of dark matter around the colliding galaxies severely distorted spacetime, deviating the path of light rays coming from the distant background galaxy -- and distorting its image into characteristic arc shapes.
Climate change and the loss of biodiversity are two of the greatest environmental issues of our time. Is it possible to address both of those problems at once?
In Australia, farmers and landholders will this week be able to apply for payments through the Federal government’s A$2.55 billion Emissions Reduction Fund. Bidders can request funding for projects that reduce emissions using agreed methods, which include approaches relevant to the transport, waste and mining sectors, as well as the land sector: for example, by managing or restoring forests.
