Tuesday, September 25, 2012
6 PLANTAS PURIFICADORAS DE AIRE
Las plantas no solo pueden ser una herramienta de decoración que siempre hace juego con todo, sino una posibilidad de mantener espacios interiores con el aire purificado.
Sin embargo, no todas las plantas sirven para este fin, e incluso pueden afectarnos ya que existen las que tienen una alta toxicidad.
1. Palmera de Bambú: Elimina formaldehido, alérgeno que se encuentra presente en múltiples producto y también se dice que actúa como un humidificador natural.
2. La planta de serpiente: Sirve para absorber los óxidos de nitrógeno y formaldehido.
3. Areca Palma: Una de las mejores plantas de purificación de aire para la limpieza del aire en general.
4. Planta araña: Gran planta de interior que se utiliza para eliminar el monóxido de carbono y otras toxinas e impurezas. Es una de las tres plantas mejor consideradas para la eliminación de formaldehido en el aire.
5. Lirio de paz: Se podría llamar la “limpieza de todos.” A menudo son colocados en los baños o cuartos de lavado, ya que son conocidos por su capacidad para eliminar las esporas de moho.
También utilizados para eliminar formaldehido y el tricloroetileno.
6. Gerbera Daisy: No sólo estas maravillosas flores eliminan el benceno en el aire, sino que se las conoce por mejorar el sueño mediante la absorción de dióxido de carbono y emitir mayor cantidad de oxígeno durante la noche.
¿SUGIERE ALGUNA OTRA
Etiquetas:
AIRE,
AMBIENTE,
E AMBIENTE,
environment,
GREEN,
MEDIO AMBIENT,
plantas,
VERDE
CURIOSIDAD - Un lago que brilla en la oscuridad - AUSTRALIA
Un hombre logró fotografiar un
rarísimo fenómeno que convierte el color del agua de un lago australiano en un
tono azul fluorescente.
Los nadadores que tomaron un baño de
medianoche en ese acuífero también parecían brillar en la oscuridad, gracias a
una reacción química llamada bioluminiscencia, que ocurre cuando los
microorganismos presentes en el agua se alteran.
“Fue como si estuviéramos jugando con
pintura radiactiva”, dijo el fotógrafo Phil Hart autor de las imágenes.
Phil puso su cámara en una velocidad
de obturación muy lenta y tiró arena y piedras al agua para provocar la
reacción y capturar la mayor cantidad de neblina azul como fuera posible.
Estas imágenes son particularmente
impresionantes porque la concentración del microorganismo “Noctiluca
Scintillans” fue anormalmente alta cuando se registraron estas fotos en el Lago
Gippsland en Victoria, Australia.
Phil, quien dijo que estar allí
viendo esta bioluminiscencia es “fascinante y muy raro”. Explicó que hace más
de 50 años visita el lago Gippsland y jamás había visto una bioluminiscencia
como ésta.
Se cree que la combinación de los
incendios forestales e inundaciones han creado los altos niveles de nutrientes
que los organismos presentes en el mencionado lago utilizan para alimentarse.
¿Es una modificación del ADN de los
microorganismos? Eso es lo que piensa el investigador español John Doe. Asegura
que algunos de sus contactos, que son ex ingenieros de la NASA, le han dicho
que este fenómeno tiene que ver mucho con “el famoso cinturón de fotones, que
está modificando el ADN de todo ser viviente”.
SALUD MENTAL - 10 básicos para tu salud mental - URUGUAY
Aprende a mantener un equilibrio que
te permita tener una vida relajada. Aquí algunos consejos para mejorar nuestra
salud emocional.
La salud mental se refiere al
equilibrio que mantiene una persona con su entorno socio-cultural. Se trata de
un estado emocional y psicológico, con el que el sujeto es capaz de hacer uso
de sus habilidades emocionales y cognitivas, sus funciones sociales y sus
labores ordinarias, explica tusaludmental.com.
Es entonces importante cuidar no sólo
el alimento y la higiene física, sino también la salud mental. Por ello, con
información de 10puntos.com, estos son algunos consejos para mantener un estado
adecuado.
1. Fomentar la confianza.
Acepta quien eres. Conoce tanto tus habilidades como debilidades y construye
una mejor versión de ti mismo.
2. Si mantienes una dieta
equilibrada, acompañada de un poco de ejercicio y el descanso
necesario, lograrás reducir el estrés y así disfrutarás más del día a día.
3. Fomenta las relaciones
que te hagan sentir bien. La familia y los amigos son claves al momento para
nutrir tus días y experiencias.
4. Recuerda que todo tipo de
relación, prospera luego de que es puesta a prueba, así que acepta y
brinda apoyo.
5. Mantente preparado.
Piensa que los problemas financieros producen estrés, así que será mejor tener
siempre un ahorro que te pueda salvar de alguna urgencia. Para que gastes
menos, piensa en lo que verdaderamente necesitas y no en lo que deseas.
6. Involúcrate con tu
comunidad, de esa manera podrás tener un propósito y sentir
satisfacción cuando estés ayudando a los demás.
7. Autocontrol. Aprende
a tener el control sobre las cosas, no dejes que el estrés te maneje. Recuerda
que éste puede amenazarnos con abrumar nuestra salud mental y hasta física.
8. Aprende a hablar.
No te quedes todo lo que sientes, busca compartir tus problemas con alguien más
que haya pasado por una situación similar a la tuya, tal vez te pueda ayudar.
De esta manera puedes encontrar una solución a las cosas y sentirte menos
aislado. Buscar ayuda profesional.
9. ¡Conócete!
Aprende a identificar tus estados de ánimo y trata de encontrar la mejor manera
para expresarte, de modo que éstas sean constructivas, cuando quieras dejar ir
alegría, tristeza, enojo, ira y miedo.
10. Mantén siempre
pensamientos positivos, porque los negativos sólo absorben energía y
no te sirven de mucho para tener un buen estado de salud mental. Lo mejor será
que mantengas optimismo ante la vida, que conozcas lo que te hace feliz y
aprendas a equilibrar y a aceptar lo que no puedes cambiar. A final de cuentas,
todo se trata de ser feliz. ¿ALGÚN CONSEJO PARA APORTAR?
Etiquetas:
AUTOCONTROL,
CONFIAMZA. RELACIONES,
ESTRES,
POSITIVO,
SALUD MENTAL
Monday, September 24, 2012
UNIVERSO / CIENCIA - El telescopio Hubble fotografió la galaxia más lejana jamás vista - MUNDO
Por primera vez se ve la “edad oscura” del cosmos, cuando el Universo estaba en Formación.
El infinito y más allá. La nueva galaxia es la mancha rojo que se ve en la imagen de abajo a la derecha. Creen que tiene “apenas” 200 millones de años. NASA
El infinito y más allá. La nueva galaxia es la mancha rojo que se ve en la imagen de abajo a la derecha. Creen que tiene “apenas” 200 millones de años. NASA
El telescopio espacial Hubble
logró fotografiar a la galaxia más lejana jamás observada . Se trata de
un viaje en el tiempo de 13.700 millones de años luz, cuando el Universo tenía
apenas 500 millones de años, según informó ayer la NASA, agencia espacial de
Estados Unidos.
La galaxia, una mancha roja en
medio de un gigantesco grupo de galaxias más jóvenes, representa la primera vez
que el Hubble escudriña la frontera de la conocida como edad oscura del
cosmos , cuando el universo en expansión pasó de ser un gran vacío a
agruparse en galaxias, estrellas y gigantescos cúmulos gaseosos.
“Esta galaxia es el objeto más
distante que jamás hemos visto con un alto grado de confianza”, indicó Wei
Zheng, científico de la Universidad Johns Hopkins de Baltimore y uno de los
investigadores que estudió la imagen obtenida por el telescopio.
Zheng aseguró que este tipo de
imágenes permitirán estudiar cómo se pasó de la era oscura del cosmos a otra en
la que los materiales originados en el Big Bang –la gran explosión que
explicaría el origen del Universo– formaron cuerpos celestes.
La ventana abierta por el Hubble,
que contó con la ayuda del telescopio espacial infrarrojo Spitzer, muestra una
galaxia joven cuya luz viajó más de 13 mil millones de años hasta llegar
a los sensores de estos dos observatorios orbitales de la NASA. Ese haz de luz
es una galaxia cuando el universo contaba con apenas un 3,6 por ciento de su
edad actual .
Para detectar una galaxia tan
lejana, cuyas ondas en el espectro electromagnético van ampliando su longitud
hasta ser difícilmente detectables, los científicos se echaron mano del efecto
de lente gravitacional, por el cual un cuerpo masivo interpuesto entre el
objeto y el observador desvía y concentra la luz incidente.
Este efecto, que predijo
Albert Einstein , fue posible debido a la presencia de un cúmulo de
galaxias entre la Tierra y la lejana luz detectada, que gracias a este fenómeno
se magnificó 15 veces.
Los investigadores creen que lo
que ahora se puede ver en la Tierra es una galaxia que tenía 200 millones de
años y representaba solo un 1 por ciento de la masa de la Vía Láctea,
debido a que existía en los primeros estadios del universo, cuando apenas había
luz.
Puesto en órbita el 24 de abril
de 1990, el telescopio espacial Hubble –tomó su nombre del célebre astrónomo
estadounidense Edwin Hubble– gira en el espacio a unos 600 kilómetros de altura
y demora apenas 97 minutos en dar una vuelta completa a la Tierra . Pesa
más de 11 toneladas y ya recibió cuatro misiones de servicio (la última, en
2009), en las que se le realizó mantenimiento y se actualizó su equipamiento.
Desde su puesta en servicio tomó más de 500 mil fotografías , que se
usaron en numerosas investigaciones en todo el mundo, y se espera que siga en
funcionamiento al menos hasta 2014
Etiquetas:
FOTOGRAFIA,
GALAXIA,
HUBBLE,
LEJANA,
TELESCOPIO,
universo
SOCIEDAD - Crearon el primer mapa 3D completo del cerebro humano - ARGENTINA
Fue desarrollado por científicos de EE.UU. Aseguran que servirá para conocer qué causa trastornos neurológicos y psiquiátricos.
El funcionamiento del cerebro
humano, uno de los grandes enigmas que desde siempre atrae a la ciencia,
va develando de a poco sus secretos. Un grupo de científicos de Estados Unidos
creó un gran mapa del cerebro de una persona adulta, el primero de
este tipo en el mundo , que muestra la actividad de los genes en todo el
órgano. Sus creadores aseguran que servirá para conocer, en un futuro, los
factores que causan los trastornos neurológicos y psiquiátricos.
El mapa fue creado a partir de
análisis genéticos de cerca de 900 partes específicas de dos cerebros
“clínicamente comunes y corrientes”, donados por dos hombres (uno de 24 años y
el otro de 39), y de medio cerebro de un tercer individuo.
Los investigadores del Instituto
Allen para la Ciencia del Cerebro de Seattle, liderados por Michael Hawrylycz,
señalaron que este mapa servirá de referencia para que ellos y otros colegas
puedan comparar la actividad genética de cerebros enfermos para arrojar luz
así sobre factores que están detrás de condiciones psiquiátricas y neurológicas
.
“El cerebro humano es la
estructura más compleja que conoce la humanidad y uno de los mayores desafíos
de la biología moderna consiste en comprender su conformación y organización”,
comentó Seth Grant, profesor de Neurociencia Molecular en la Universidad de
Edimburgo, en Escocia, que trabajó en este mapa. “ Esto nos permite, por
primera vez, cubrir al genoma humano del cerebro.
Nos brinda básicamente la clave
para comprender la conexión entre el genoma y el cerebro y nos aporta una
camino hacia el futuro para poder decodificar cómo los trastornos genéticos
impactan y generan enfermedades cerebrales”, agregó el especialista.
El poder del cerebro deriva de
sus conexiones nerviosas, su variedad de células y estructuras, y en última
instancia de dónde y cuándo los diferentes genes se activan y desactivan en
toda su masa de tejido, que pesa 1,9 kilo.
A partir de las más de 100
millones de mediciones que se realizaron en los cerebros analizados, algunas en
nada más que unos pocos milímetros cúbicos, los científicos descubrieron que el
84 por ciento de los genes son activados en alguna parte de este órgano .
La actividad genética en regiones contiguas de la corteza, esa gran superficie
rugosa del cerebro, era similar pero diferente de la vista en las partes
inferiores, como el bulbo raquídeo.
Un análisis más detallado de la
corteza mostró patrones en la actividad genética que se correspondían con
regiones con papeles específicos del cerebro, como las funciones sensorial y de
movimiento. El mapa no mostró ninguna división importante de la actividad
genética en los costados derecho e izquierdo del cerebro, lo que sugiere que la
habilidad o destreza que maneja un hemisferio, como el lenguaje, proviene de
diferencias más sutiles que las que pudo detectar el estudio.
A pesar de que los cerebros
analizados provenían de hombres de edad y grupo étnico similares, el patrón de
actividad genética era tan parecido que los investigadores sospechan que
existiría una suerte de plan de acción común. Los científicos ya habían elaborado
mapas genéticos similares para los roedores, pero la escasez de cerebros
humanos donados, su tamaño y la naturaleza destructiva de los análisis
hacían ver que el equivalente humano era un desafío mayor.
En el artículo que escribieron
para la prestigiosa revista inglesa Nature –que publicó la investigación
como principal tema de su portada–, los científicos describen cómo escanearon
los cerebros donados y cómo los cortaron luego en pedazos. Midieron en cada uno
de ellos los niveles de actividad de los 20 mil genes del genoma humano.
El mapa, que superpone los
resultados genéticos en una imagen tridimensional del cerebro , está
disponible libremente en Internet para que todos los investigadores lo puedan
usar. Sólo hay que descargar una aplicación, disponible sólo en inglés para
computadoras Mac o que corran bajo Windows, desde la dirección www.brain-map.org
.
Grant adelantó que en los futuros
estudios intentarán relacionar al mapa cerebral genético con otros estudios
genéticos o escaneos cerebrales de cerebros anormales o enfermos. Esto podría
poner al descubierto los genes que juegan un papel en las enfermedades
cerebrales e indicar el camino para tratamientos.
Etiquetas:
3D,
CEREBRO,
CIENCIA,
MAPA,
MAPA DEL CEREBRO
SCIENCE / HERITAGE - Critics scrutinise claim that ancient papyrus suggests Jesus had a wife - EGYPT
Scholars on
Wednesday questioned the much-publicized discovery by a Harvard scholar that a
4th century fragment of papyrus provided the first evidence that some early
Christians believed Jesus was married.
And experts in the
illicit antiquities trade also wondered about the motive of the fragment's
anonymous owner, noting that the document's value has likely increased amid the
publicity of the still-unproven find.
Karen King, a
professor of early Christianity at Harvard Divinity School, announced the
finding Tuesday at an international congress on Coptic studies in Rome. The
text, written in Coptic and probably translated from a 2nd century Greek text,
contains a dialogue in which Jesus refers to "my wife" whom he
identifies as Mary.
King's paper, and
the front-page attention it received in some U.S. newspapers that got advance
word about it, was a hot topic of conversation Wednesday at the conference.
Christian tradition
has long held that Jesus was unmarried, although there is no reliable
historical evidence to support that, King said. Any evidence pointing to
whether Jesus was married or had a female disciple could have ripple effects in
current debates over the role of women in the church.
Stephen Emmel, a professor
of Coptology at the University of Muenster who was on the international
advisory panel that reviewed the 2006 discovery of the Gospel of Judas, said
the text accurately quotes Jesus as saying "my wife." But he
questioned whether the document was authentic.
"There's
something about this fragment in its appearance and also in the grammar of the
Coptic that strikes me as being not completely convincing somehow," he
said in an interview on the sidelines of the conference.
Another participant
at the congress, Alin Suciu, a papyrologist at the University of Hamburg, was
more blunt.
"I would say
it's a forgery. The script doesn't look authentic" when compared to other
samples of Coptic papyrus script dated to the 4th century, he said.
King acknowledged
Wednesday that questions remain about the fragment, and she welcomed the
feedback from her colleagues. She said she planned to subject the document to
ink tests to determine if the chemical components match those used in
antiquity.
"We still have
some work to do, testing the ink and so on and so forth, but what is exciting
about this fragment is that it's the first case we have of Christians claiming
that Jesus had a wife," she said.
She stressed that
the text, assuming it's authentic, doesn't provide any historical evidence that
Jesus was actually married, only that some two centuries after he died, some
early Christians believed he had a wife.
Wolf-Peter Funk, a
noted Coptic linguist, said there was no way to evaluate the significance of
the fragment because it has no context. It's a partial text and tiny, measuring
4 centimeters by 8 centimeters (1.5 inches by 3 inches), about the size of a
small cellphone.
"There are
thousands of scraps of papyrus where you find crazy things," said Funk,
co-director of a project editing the Nag Hammadi Coptic library at Laval
University in Quebec. "It can be anything."
He, too, doubted
the authenticity, saying the form of the fragment was "suspicious."
Ancient papyrus
fragments have been frequently cut up by unscrupulous antiquities dealers
seeking to make more money.
An anonymous
collector brought King the fragment in December 2011, seeking her help in
translating and understanding it. In March, she brought it to two papyrologists
who determined it was very likely authentic.
On Tuesday, Harvard
Divinity School announced the finding to great fanfare and said King's paper
would be published in January's Harvard Theological Review. Harvard said the
fragment most likely came from Egypt, and that its earliest documentation is
from the early 1980s indicating that a now-deceased professor in Germany
thought it evidence of a possible marriage of Jesus.
Some archaeologists
were quick to question Harvard's ethics, noting that the fragment has no known
provenance, or history of where it's been, and that its current owner may have
a financial interest in the publicity being generated about it.
King has said the
owner wants to sell his collection to Harvard.
"There are all
sorts of really dodgy things about this," said David Gill, professor of
archaeological heritage at University Campus Suffolk and author of the Looting
Matters blog, which closely follows the illicit trade in antiquities. "This
looks to me as if any sensible, responsible academic would keep their distance
from it."
He cited the
ongoing debate in academia over publishing articles about possibly dubiously
obtained antiquities, thus potentially fueling the illicit market.
The Archaeological
Institute of America, for example, won't publish articles in its journal
announcing the discovery of antiquities without a proven provenance that were
acquired after a UNESCO convention fighting the illicit trade went into effect
in 1973.
Similarly, many
American museums have adopted policies to no longer acquire antiquities without
a provenance, after being slapped with successful efforts by countries like
Italy to reclaim looted treasures.
Archaeologists also
complain that the looting of antiquities removes them from their historical
context, depriving scholars of a wealth of information.
However, AnneMarie
Luijendijk, the Princeton University expert whom King consulted to authenticate
the papyrus, said the fragment fit all the rules and criteria established by
the International Association of Papyrologists. She noted that papyrus
fragments frequently do not have a provenance, simply because so many were
removed from Egypt before such issues were of concern.
She acknowledged
the dilemma about buying such antiquities but said refraining from publishing
articles about them is another matter.
"You wouldn't
let an important new text go to waste," she said.
Hany Sadak, the
director general of the Coptic Museum in Cairo, said the fragment's existence
was unknown to Egypt's antiquities authorities until news articles this week.
"I personally
think, as a researcher, that the paper is not authentic because it was, if it
had been in Egypt before, we would have known of it and we would have heard of
it before it left Egypt," he said
Thursday, September 20, 2012
BUENA VIDA - Primavera para el amor - ARGENTINA
El clima cálido y la exposición al sol aumentan los estímulos y el deseo. Médicos y psicólogos dicen que estar enamorado mejora la salud y la capacidad para hacerle frente al estrés. Un remedio que no se vende bajo receta.
El bienestar, la estabilidad, la certidumbre, la seguridad y la compañía que configura la pareja aumentan la resistencia frente al estrés.
El bienestar, la estabilidad, la certidumbre, la seguridad y la compañía que configura la pareja aumentan la resistencia frente al estrés.
Los días cálidos invitan a salir y
divertirse. La primavera es una de las estaciones preferidas de los poetas que
le escriben al amor. Pero, ¿la llegada de esta estación modifica el
comportamiento emocional? Lo que la ciencia sabe es que el aumento de la temperatura,
los días más largos y la exposición a la luz solar aumentan los estímulos,
especialmente los que entran por los ojos y por la nariz, influyen en el
erotismo y, previo paso por el sistema nervioso central, provocarían una mayor
predisposición a la erección y el deseo.
Estar enamorado y ser correspondido,
lo sabe cualquiera que lo haya experimentado, es un estado en el que hasta los
más escépticos sienten que todo está bien y que la felicidad es posible. Esa
sensación tiene explicaciones diversas que varían de acuerdo a la teoría desde
la que se la mire. Pero tanto la psicología, como la medicina y la neurobiología
coinciden en el diagnóstico: una persona "enamorada" es una persona
más sana que aquellas que no sienten amor, en cualquiera de sus variantes.
“Hay que diferenciar el amor del
enamoramiento, que es la etapa más fascinante, el enamorado se siente
poderoso, y está como hechizado”, explica la psicoanalista Lila Isacovich,
directora del Area Asistencial de la Fundación Buenos Aires. “El amor no sólo
es saludable, es indispensable y necesario, si no, uno cae en la melancolía y
en la depresión. Cuando por momentos el amor decae nos sentimos desgraciados.
Uno soporta la vida porque hay amor”, agrega.
Sin ansiedad
“Enamorarse es una de las condiciones
más deseadas por el ser humano. El estado de enamoramiento es uno de los más
placenteros, no es casualidad que se dedique un día al año para recordar a
San Valentín, protector de los enamorados, para que vele por el porvenir del
romance y por ese ser que ha sido buscado y encontrado en la vida”, señala la
licenciada Gabriela Martínez Castro, psicóloga y directora del Centro de
Estudios Especializados en Trastornos de Ansiedad (CEETA).
“El estado de enamoramiento debería
ser uno de los más gratificantes, el ánimo es óptimo, la creatividad se incrementa,
aumenta la motivación por el cuidado personal, incluyendo el cuidado físico,
aunque esto se pueda transformar en un problema para las personas ansiosas que
confunden los síntomas muy comunes del enamoramiento con un cuadro de
ansiedad”, advierte . Cómo distinguirlos: los síntomas del amor enriquecen la
vida, los de los trastornos de ansiedad, por el contrario, la complican e
incapacitan.
El cerebro y sus circuitos
Los efectos del amor también se ven
en las neuronas. “Hay estudios que sugieren que en el amor se activan los
sistemas de recompensa del cerebro y se desactivan los circuitos cerebrales
responsables de las emociones negativas y de la evaluación social”, aporta el
doctor Facundo Manes, director de INECO y del Instituto de Neurociencias de la
Fundación Favaloro.
“El bienestar, la estabilidad, la
certidumbre, la seguridad y la compañía que configura la pareja aumentan la
resistencia frente al estrés”, dice, por su parte, el doctor Daniel López
Rosetti, presidente de la Sociedad Argentina de Medicina del Estrés.
“El amor, en términos bursátiles, es
una buena inversión, porque la resiliencia (la capacidad de sobreponerse a
situaciones adversas) mejora en las situaciones en que las personas se sienten
queridas. Si se pudiera recetar cápsulas de amor, los médicos las indicarían”,
concluye, romántico.
La salud del vínculo
Una investigación publicada en el
Journal of Psychosomatic Medicine demuestra que los hombres casados desarrollan
menor nivel de ateroesclerosis que los solteros.
“La tranquilidad y la estabilidad
emocional disminuyen el nivel de estrés y generan menor formación de
ateroesclerosis”, explica el estudio. ¿Qué ocurre con las mujeres? “Se comprobó
que quienes desarrollan menor nivel de ateroesclerosis son aquellas que
manifestaron vivir una relación de pareja feliz. Así, se interpretó que en los
hombres importa más el status (‘estar casado’), mientras que en las mujeres es
central que sea un vínculo satisfactorio”.
Otro estudio, realizado entre más de
500 mil parejas formadas por mayores de 65 años, mostró cuánto daña la salud la
viudez: el riesgo de muerte aumentó hasta un 21% en los hombres que enviudaron
y hasta el 17% en las mujeres.
ENVIRONMENT - Bolivia enacts law to protect Amazon pink dolphins - BOLIVIA
Bolivian President Evo Morales has enacted a law aimed at
protecting a unique species of dolphins that live in the country's Amazon
rivers.
The new legislation bans fishing freshwater pink dolphins and declares the species a national treasure.
At a ceremony along the shores of the Ibare river, President Morales called on the armed forces to protect the habitats of the pink dolphins
The species is threatened by erosion, pollution and logging in the Amazon.
The Bolivian pink dolphin, whose scientific name is Inia boliviensis, is similar to mammals found in neighbouring Brazil, Peru, Colombia and Venezuela.
Male Bolivian freshwater pink dolphins can weigh up to 200kg (440 pounds).
An appendix to the Convention on International Trade in Endangered Species of Wild Flora and Fauna (Cites) says the species is vulnerable because of overfishing in the Amazon basin.
But it says the main threat is the contamination of rivers in the region by mercury, used in illegal gold mining operations.
Etiquetas:
DELFINES,
DOLPHINS,
environment,
medio ambiente,
PROTECT,
SALVAR,
save
SCIENCE / MARS - Curiosity Mars rover picks up the pace - WORLD
The Curiosity rover is making good
progress towards its first major science destination on Mars.
The vehicle has now driven 289m (950ft) since its landing on the Red Planet some six weeks ago.
It has perhaps another 200m still left to cover to get to a location dubbed Glenelg, where researchers expect to find an interesting juxtaposition of three types of geological terrain.
But before it goes any further, the rover will study a dark rock.
Measuring about 25cm in height and 40cm at the base, it is not expected to have major science value.
Rather, the rock provides an opportunity for the robot to use three of its survey instruments in tandem for the first time.
The rock has been named "Jake Matijevic" in honour of a Curiosity engineer who tragically died shortly after the vehicle touched down in Mars' Gale Crater on 6 August (GMT).
The rover will zap the rock from a distance with its ChemCam laser and examine it up close with its Mahli "hand lens" and the X-ray spectrometer known as APXS. The latter two devices are held on the end of the rover's robotic arm; the laser is mounted on its mast.
The investigation will give a good idea of the atoms present in the Matijevic rock and its likely mineralogical composition - although the Curiosity science team fully expects to "discover" another ubiquitous lump of Martian basalt (a volcanic rock).
"It's a cool looking rock with almost pure pyramidal geometry," said Prof John Grotzinger, the mission's lead scientist. Such a shape was not uncommon, he explained, and probably reflected wind erosion processes.
"Our general consensus view is that these are pieces of impact ejecta from an impact somewhere else, maybe outside of Gale Crater, that throws a rock on to the plains, and it just goes on to sit here for a long period of time. It weathers more slowly than the stuff that's around it. So, that means it's probably a harder rock."
The point of the upcoming exercise is to demonstrate the procedure for selecting targets of higher importance - rocks that in future could have significantly more scientific interest and which might require a sample to be drilled and delivered to two sophisticated analysis labs inside the rover's body.
In a briefing with journalists on Wednesday, the US space agency (Nasa) also released pictures taken by the rover of the Martian moons Phobos and Deimos passing in front of the sun.
These transits are relatively rare - twice per Martian year, which is once every Earth year - but are of great interest to scientists trying to understand the internal make-up of the Red Planet.
"[The moons] have tidal forces that they exert on Mars; they change Mars' shape ever so slightly," explained Curiosity researcher Mark Lemmon from Texas A&M University, College Station.
"That in turn changes the moons' orbits - Phobos is slowing down, Deimos is speeding up (like our Moon is). This is something that is happening very slowly over time.
"And with the transits, we can measure their orbits very precisely and figure out how fast they're doing this. The reason that's interesting is because it constrains Mars' interior structure. We can't go inside Mars but we can use these transits to tell how much Mars deforms when the moons go by."
Curiosity has now spent 43 sols (Martian days) on the planet. Much of that time has been spent commissioning the rover's systems and instruments.
The vehicle was sent to Mars to try to understand whether past environments at its landing location in Gale Crater could ever have supported microbial life.
That question will more properly be addressed when it gets to the base of the big mountain (Mount Sharp) that dominates the centre of the 150km-wide equatorial depression.
Sediments at the lower reaches of the peak appear from satellite pictures to have been laid down in the presence of abundant water.
Curiosity will establish whether that is so, but it is unlikely to begin this particular investigation for many months.
The mountain target lies several km to the south-west of its current location, and the desire to see the interesting rocks at Glenelg is actually taking the vehicle in the opposite direction to Mount Sharp.
The science team is in no hurry, however. Curiosity is equipped with a nuclear battery and has ample power to complete its prime two-year mission. Further funding from Nasa could yet see this project drive and drive deep into the decade.
- (A) Curiosity will trundle around its landing site looking for interesting rock features to study. Its top speed is about 4cm/s
- (B) This mission has 17 cameras. They will identify particular targets, and a laser will zap those rocks to probe their chemistry
- (C) If the signal is significant, Curiosity will swing over instruments on its arm for close-up investigation. These include a microscope
- (D) Samples drilled from rock, or scooped from the soil, can be delivered to two hi-tech analysis labs inside the rover body
- (E) The results are sent to Earth through antennas on the rover deck. Return commands tell the rover where it should drive next
Wednesday, September 19, 2012
HEALTH / SCIENCE - Swedish women have world's first mother-to-daughter uterus transplants - SWEDEN
Two
Swedish women are carrying the wombs of their mothers after the world's first
mother-to-daughter uterus transplants.
Specialists
at the University of Gothenburg completed the surgery over the weekend without
complications.
They
were waiting until the women get pregnant to consider the procedures a success,
they said. Michael Olausson, one of the Swedish surgeons, told the Associated
Press: "That's the best proof."
He
said the daughters started in-vitro fertilization, or IVF, before the surgery.
After a waiting period of a year, their wombs will be implanted with their
embryos created by fertilising their harvested eggs with their partners' sperm.
The embryos have been frozen but each woman would only be allowed to have two
pregnancies, Olausson said. The wombs would then be removed.
The
university said one recipient had her uterus removed many years ago due to
cervical cancer and the other was born without a uterus. The women are aged 32
and 37 and have not been named. Their mothers were chosen as donors because
they were good tissue matches and their wombs had already proved they were
capable of carrying at least one child to term.
"Both
patients that received new uteri are doing fine but are tired after surgery.
The donating mothers are up and walking and will be discharged from the
hospital within a few days," team leader Mats Brannstrom said in a
statement.
The
team plan to carry out a further eight womb transplants.
Turkish
doctors last year said they performed the first successful uterus transplant,
giving a womb from a deceased donor to a young woman. Olausson said that woman
was doing well, but he wasn't sure whether she had started undergoing fertility
treatment.
In
2000, doctors in Saudi Arabia transplanted a uterus from a live donor, but it
had to be removed three months later because of a blood clot.
Scott
Nelson, chair of obstetrics and gynaecology at the University of Glasgow,
called the Swedish transplants a "huge step" but stressed it remained
to be seen whether they resulted in successful pregnancies.
"In
terms of the risk to the pregnancy, the greatest concerns are the placenta not
developing normally, the baby not growing properly and being born
prematurely," said Nelson, who was not involved with the transplants.
"Pre-term birth is a major risk, ie a small baby being born, that's what
you'd mainly be worried about."
Etiquetas:
DONATE,
DOUGTHER,
GIVE,
GOTHEMBURG,
mom,
transplant,
UTERUS,
WOMB
Tuesday, September 18, 2012
GREEN - Pro Sports Go Green. Do Fans Care? - USA
Pro sports teams around the country are hyping their renewable energy use and promising to become more efficient. Will that help make their fans greener?
The Philadelphia Eagles' Lincoln Financial Field is the greenest stadium
in pro sports.
The NFL season finally kicked off last night when the Dallas Cowboys
came to New York—or actually the New York-adjacent swamplands of New Jersey—to
take on the defending Super Bowl-champion Giants. (As a Philadelphia Eagles
fan, I would have liked some sort of double-forfeit scenario, but it wasn’t
meant to be.) The sky-high TV ratings of the NFL Kickoff game is a reminder that—Presidential
campaigns and political conventions aside—what Americans really care about is
professional sports. Doubt that? Nearly 167 million Americans watched
this year’s Super Bowl, well above the 130
million or so people who voted in the 2008
Presidential elections.
The sheer influence of pro sports prompted the Natural Resources Defense
Council (NRDC) to begin working in 2003 to help green the multi-billion dollar
industry. Yesterday NRDC released a report highlighting some of the
best environmental initiatives being carried out by NFL, NBA, NHL, MLB and WNBA
teams—more than a quarter of which have shifted to renewable energy for at
least some of their operations, while more than half have energy efficiency
programs. How much of an impact a little solar and a little extra insulation
have against the incalculably huge carbon footprints and energy bills of the
nation’s pro sports teams isn’t clear. But NRDC hopes that pro sports—perhaps
the one area where Americans of all political stripes come together—can
demonstrate that going green isn’t extreme, as NRDC green sports project
director Allen Hershkowitz put
it in a statement:
A
cultural shift in environmental awareness is needed in order for us to address
the serious ecological problems we face, and the sports industry, through its
own innovative actions, has chosen to lead the way. Pro sports are showing that
smart energy, water and recycling practices make sense. They save money and
prevent waste. That’s as mainstream and non-partisan as it comes.
Or at least that’s what NRDC and environmentalists are hoping. Clean
energy and efficiency are pretty mainstream and non-partisan notions, especially when they’re removed from the messiness of politics and
stripped for the most part of any mention of more sensitive topics like climate
change. If solar panels and biodiesel are good enough for the Eagles—whose
Lincoln Financial Field is set to become the first stadium in the
U.S. capable of generating 100% of its energy on site—it should be good enough
for all Americans. Maybe
even Cowboys fans.
Highlights from the report
include:
·
·
The NHL has introduced
Gallons for Goals, committing to restore 1,000 gallons of water to a critically
dewatered river in the Northwest for every goal scored in the regular season.
(Of course, this means that every time your favorite goalie stops a shot, he’s
actually hurting the environment. Although that may explain what Penguins’
goalie Marc-Andre Fleury was doing during last spring’s
playoffs.
·
This year the Cleveland
Indian’s Progressive Field became the first stadium to install a wind turbine,
which generates more than 40,000 kilowatt hours per year. (No word on whether
the Chicago White Sox will try to tap the wind energy generated by major league strikeout leader Adam
Dunn’s swings and misses.)
·
The Seattle Mariners
replaced an incandescent scoreboard with an LED one, reducing electricity
consumption by more than 90%. (It’s not part of their green program, but the
Mariners are also saving on electricity consumption for their scoreboard by simply not scoring. That’s offensive conservation.)
·
In one year, energy
efficiency at the Miami Heat’s American Airlines Arena resulted in 53% less
energy use than the average facility of the same size. This saved the team $1.6
million—enough to buy you about 7 games of Lebron James.
Bryan Walsh is a senior editor at TIME.
Find him on Twitter at @bryanrwalsh. You can also continue the discussion on TIME’s
Facebook page and on Twitter at @TIME
Etiquetas:
earth,
ECOENERGY,
ENERGY ECO,
environment,
GO GREEN,
GREEN,
PLANET
ENVIRONMENT NEWS - How Fungi Create the Amazon’s Clouds - BRAZIL
Adalberto Rios Lanz/Sexto Sol
Mist and clouds above the Amazon are formed in part by the vegetation
below
When you mess with the Amazon rainforest you mess with a lot of things —
2.5 million species of insects, 40,000 species of plants, 1,300 species of
birds, and those are only the known ones. The 1.4 billion of acres of thriving,
sprawling biology that cover the Amazon help drive the very metabolism of a
continent. And now it appears that the rainforest is at least partly
responsible for something else: the Amazonian clouds themselves. Clear-cut the
land and you could, in effect, clear-cut the sky.
That improbable idea comes courtesy of a paper just released in the journal Science, the product of work done
by researchers at the Max Planck Institute for Chemistry in
Mainz, Germany. The clouds in the Amazon, just like everywhere else, consist of
water vapor clinging to tiny clumps of carbon compounds. In forested areas, the
carbon compounds are byproducts of plants’ metabolism; in populated areas, they
are often from human pollution. Most of the time, atmospheric chemists can see
the carbon clumping taking place; when the microscopic bits reach a certain
size, they are able to attract and hold water. In the Amazon, the clumps seem
to appear out of nowhere, nearly fully formed. No one has ever been able to
catch them in the act of coming together.
(PHOTOS: Brazil’s Controversial Belo Monte Dam)
(PHOTOS: Brazil’s Controversial Belo Monte Dam)
Max Planck graduate student Christopher Pohlker traveled to a pristine
stretch of forest in Brazil to see if he could solve the riddle. He gathered a
bit of rainforest air, using an instrument that sucks a sample through a fine
nozzle and sprays it onto a ceramic square half a millimeter on each side,
where any microscopic airborne particles get stuck. To figure out the chemical
make-up of those particles, he and his colleagues brought the squares to Lawrence Berkeley
National Laboratory in California and
placed them in the facility’s synchrotron, where X-rays of varying energies
were fired at the collected specks. The specific frequencies that were absorbed
could reveal the samples’ chemical makeup.
What the researchers found was a mix of carbon compounds, plus one other
thing: potassium — and that told them a lot. Potassium salts appear to be good
at getting carbon compounds to stick together. The larger a carbon cluster was,
the larger the ratio of carbon compounds to potassium within it, suggesting
that just a certain amount of potassium was needed to get the accretion process
started, and after that the carbon compounds kept piling on of their own
accord. That, in turn, would get water droplets forming.
(More: Amazonia: What’s Happening to the World’s Biggest Rainforest?)
(More: Amazonia: What’s Happening to the World’s Biggest Rainforest?)
The real surprise was the source of the potassium. Forest fires often
release the element into the air, but there were none burning when Pohlker took
the samples. “Since we can rule out the burning source in our samples,” he
says, “the other source seemed to be the biosphere itself.” In other words, the
forest.
Plants and fungi can release potassium into the air under certain
conditions. Fungi in particular are veritable fountains of the stuff: when they
shoot out their spores, they also spray out a potassium-rich fluid. Biologists
working with leaf molds and other fungi in the lab had noticed this, and
atmospheric chemists had noticed that there seemed to be a lot of potassium floating
above the Amazon in the wet season. Pohlker’s adviser, chemist Meinrat Andreae,
in fact recently reported that a third of the Earth’s land surface is probably
covered with microscopic fungi. But until now, no one had linked potassium from
fungi to cloud formation. “We think the residue of these droplets is what we
are observing,” Pohlker says. “It’s really impressive.”
Pohlker, Andreae, and their colleagues ran the numbers and found that
the amount of potassium particles released from microscopic fungi in the lab
was indeed enough to account for the concentration of potassium they observed
in their samples. But there are still some crucial experiments left to do:
specifically, they have not yet actually verified that the microscopic fungi
living on the forest trees in the Amazon are in fact releasing the potassium
they see in the air. “What we’re still lacking is a demonstration that if you
go to a plant in the Amazon and put a plastic bag around it, you’ll see these
particles coming off,” Andreae says. “That’s one of the things we want to do
next.”
Even when that’s done, it’s not clear everyone will be sold on the new
findings — or at least on their thoroughness. “Are these particles only
relevant directly over the rain forest, or are they lofted by convection and
transported to surrounding regions?” wrote Yale University professor and climate modeler Trude Storelvmo in an email. Yet another
topic for future research is the question of whether the Amazon is the only rainforest
that gets the potassium cycle going this way or if other — perhaps all —
rainforests do it. What’s settled science now, however, is that just as the
Amazon is dependent on the rain and sunlight provided by the sky, the sky is
dependent on the nourishment from the forest. The circle of life just added
another ring.
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