Un grupo de científicos de la Universidad de Cambridge ha logrado reparar, por primera vez, conductos biliares lesionados en hígados humanos mediante la inyección de organoides.
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Un método que emplea técnicas sencillas genera objetos en el espacio sin impresoras 3D. Usa tinta de rotuladores y agua. Y un poco de química.
Si se quiere combatir información falsa, lo mejor es desmentirla a posteriori.
«Don't mess with masturbation. "It's making love with someone I love." They are words of Woody Allen that serve to remove a little iron from a pleasurable activity that has nothing negative, quite the opposite.
The National Survey of Sexual Health and Behavior (NSSHB) at Indiana University, between March and May 2009, collected data from 5,865 Americans between 14 and 94 years of age regarding masturbation. The survey was presented anonymously and online to ensure that people lied less. You can see the results in the following table:
Averages
On average, 78 percent of respondents ages 14 and older say they have masturbated at some point in their lives. Doing it very often does not reflect any problem, as long as this activity does not steal time for things that we consider more important.
When men in their 30s were asked if they had masturbated at any time in their lives, 93.4 percent said yes. 80.3 percent of 30-year-old women say they have masturbated at some point. One explanation for the differences between age groups could be that masturbation has become more frequent as taboos around masturbation itself have weakened.
Masturbation increases oxytocin levels in both sexes. Masturbating helps strengthen the immune system, since when you ejaculate, hormones such as cortisol are released, which improve defenses.. Reduces infections or diseases of the urinary tract. Men who practice masturbation between the ages of 20 and 50 have a lower risk of suffering from prostate tumors, according to a study published by the journal of urology BJU International.
By the way, May was Masturbation Month. During the 19th and early 20th centuries, It was believed that a swollen nose was a sign of sexual obsession and that it revealed a habit of masturbation., but fortunately we no longer have to hide our nose (or anything else).
Via | FiveThirtyEight
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How much do men and women masturbate?
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A study by scientists at Kyoto University and Fukui University reports that an antibody to a gene (uterine sensitization-associated gene-1 or USAG-1) can stimulate tooth growth in mice who suffer from dental agenesis, a congenital condition.
The study is the first to show the benefits of monoclonal antibodies in tooth regeneration and provides a new therapeutic framework for a clinical problem that can currently only be solved with implants and other artificial measures. He study has been published in Science Advances.
dental anesia
The dental agenesis This is what we commonly know as the lack or absence of a tooth. It is a defect in which certain teeth do not erupt in the mouth due to the absence of these pieces. It is quite common in a high percentage of human beings. It can occur in both permanent teeth and temporary teeth (baby teeth). Although the normal adult mouth has 32 teeth, approximately the 1% of the population has more or less due to congenital conditions.
According to Katsu Takahashi, one of the main authors of the study and a senior professor at the Faculty of Medicine of Kyoto University, the fundamental molecules responsible for the development of teeth have already been identified:
The morphogenesis of individual teeth depends on the interactions of several molecules, including BMP, or bone morphogenetic protein, and Wnt signaling.
BMP and Wnt They are involved in much more than tooth development. They modulate the growth of multiple organs and tissues of the human body. Consequently, medications that directly affect its activity are commonly avoided, as the side effects could affect the entire body.
Considering, then, that targeting the factors that antagonize BMP and Wnt specifically in tooth development could be safer, the team considered the USAG-1 gene.
Therefore, they investigated the effects of several monoclonal antibodies to USAG-1. Monoclonal antibodies are commonly used to treat cancers, arthritis, and vaccine development.
Experiments with this antibody revealed that BMP signaling is essential for determining tooth number in mice. Furthermore, a single administration was sufficient to generate a complete tooth. Subsequent experiments showed the same benefits in ferrets.
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This new drug makes teeth grow in mice that lack them
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Sergio Parra
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La misión MAIUS-1 publica los resultados de la primera colisión de condensados de Bose-Einstein en una nave en órbita. El estudio de sistemas cuánticos en microgravedad abre la puerta a nuevos experimentos de física fundamental.
Los pacientes con trastornos depresivos perciben el contraste de las imágenes de modo distinto.
The resulting material shows high mechanical strength, stability when containing liquids and resistance to ultraviolet light. It's a new bioplastic developed using wood by-products, according to a study published in Nature Sustainability.
It can also be safely recycled or biodegraded in the natural environment, and has a lower environmental impact over the life cycle compared to petroleum-based plastics and other biodegradable plastics.
Discarded wood dust
The researchers used a wood dust, a processing residue that is usually discarded as waste at sawmills, and deconstructed the loose, porous structure of the dust with a biodegradable and recyclable deep eutectic solvent (DES).
As explained Yuan Yao, assistant professor of industrial ecology and sustainable systems at the Yale School of the Environment (YSE):
There are many people who have tried to develop these types of polymers into plastic, but mechanical threads are not good enough to replace the plastics we use today, which are mainly made from fossil fuels. We have developed a simple and direct manufacturing process that generates biomass-based plastics from wood, but also plastic that also offers good mechanical properties.
While the process currently uses wood byproducts in manufacturing, the researchers note that they are aware that large-scale production could require the use of massive amounts of wood, which could have far-reaching implications on forests, which is why the research team continues to investigate the potential impact on forests if the manufacturing of this bioplastic is expanded.
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The news
More durable and sustainable bioplastics developed using wood by-products
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Xataka Science
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Sergio Parra
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Un reciente artículo ha establecido un récord de velocidad a la hora de multiplicar dos matrices. Pero también marca el final del método que se ha usado durante décadas para realizar avances.
¿Pudo haber supervivientes en Pompeya? Un estudio determina que si los flujos piroclásticos hubiesen sido más breves, sí podría haberlos habido.