The flower is the reproductive organ of angiosperm plants. Flowers that have reproductive organs of both sexes, male and female, are called hermaphrodites (or monoecious). Flowers that have reproductive organs of only one sex (male or female) are called dioecious.
Schwann Cells Certain types of neurons are surrounded by special cells, Schwann cells. These cells coil dozens of times around the axon and form a membranous layer called the myelin sheath. The myelin sheath acts as an electrical insulation and increases the velocity of nerve impulse propagation along the axon.
In most dicot plants the xylem is concentrated in the innermost region of the central cylinder. When a cross-sectional view of the root is observed, the protoxylem occupies an area in the shape of a cross or star, the ends of which touch the pericycle. The protofloema is found in the vertices formed by the "arms" of the cross.
In the epidermis, structures such as stomata, trichomes, hydatodes and acumini differ. Stomata No doubt, stomata are the most important attachments related to the exchange of gases and water between the leaves and the environment. Stomatic cells are the only cells in the epidermis that have chlorophyll. A stomata seen from above, resembles two beans arranged with the concavities facing each other: they are the two stomatal cells or guard cells, which have thicker cell wall on the concave face and whose arrangement leaves between them a space called stomatal slit or ostiole.
The best known plant hormones are auxins, substances related to growth regulation. Of the auxins, the best known is AIA - indolylacetic acid. EIA in plants is not only produced in coleoptile (Coleoptile is called the first portion of the plant that appears on the soil surface.
How plants nourish themselves Plant nutrition is autotrophic, in that it differs from animal nutrition, which is heterotrophic. While animals obtain food by eating other living things, plants themselves make the organic matter they feed them. For this they use carbon dioxide from the air and water and mineral salts (inorganic nutrition) taken from the ground.
Scientists have identified a part of the brain that appears to be unique to humans. The brain region, called the lateral frontal pole of the prefrontal cortex, was described on January 28, 2014 in the journal Neuron, and is linked to higher thinking processes. "We tend to think that being able to plan for the future, being flexible in approach and learning from others are things that are particularly impressive about humans," said Matthew Rushworth, experimental psychologist at Oxford University.
Scientists discover cause of bee disappearance Brazilian clay filter is the most efficient in the world British company sells plant that gives potatoes and tomatoes Koalas may disappear with Australian warming, study says Researcher finds 5.4m 'monster fish' in US Activists Rescue dogs after complaint in SP Stuffed cracker is as addictive as cocaine, scientists say Greenhouse gas emissions should pass ideal limit by 2020, UN alert Detected 26 cases of thyroid cancer in children in Fukushima Country says Anvisa Africa could lose 20% of its elephants in 10 years, says report Disappearance of large carnivores threatens ecosystem Discovery of new brain region that makes humans unique Oil has toxic effects on fish heart Monkey can control movements another with thought Asian elephants are able to comfort themselves at home Angsts of Anguish Creates Low - Cost Microscope Printed on Cardboard Moss Reborn 1.
Researchers rely on the intelligence and learning ability of animals to create alternatives to slaughter. The Australian government recently authorized shark slaughter on the east coast of the country due to the increasing number of attack deaths. There have been seven in the last three years, compared with 20 in the last century.
Mobile app photographs animal run over and uploads to database. Mobile vulture wants to boost planning to curb animal deaths. A smartphone app could become Brazil's main ally to reduce road kill of roadkillers, estimated at 450 million a year.
Scientists produce altered insects to produce mainly males - the idea being that this leads to the disappearance of the species. Biologists announced on Tuesday, June 11, 2014, that they have developed a new weapon against malaria. They created genetically engineered mosquitoes to produce mainly male offspring - eventually leading to the disappearance of the entire insect population.
Mutation was inherited from a lawyer who helped found Clube do Choro. Family says it is proud and elects Hulk, Oscar and David Luiz their favorites. João Silva, 15, who likes to play as a goalkeeper, shows a six-fingered hand; This feature is common to 14 members of his family. The beginning of the World Cup reinforced in a family in Brasilia the pride for a characteristic that makes it very peculiar: of the 24 members, 14 were born with 6 fingers and toes.
Ability to see colors helps identify predator or catch insects. Study helps to understand 'color blindness' found in American monkeys. Images of predators hidden in the wild were shown to human volunteers with normal vision and color blindness; In the photo, a taxidermized leopard was hidden in the middle of the foliage.
Researchers at the University of Surrey say empathy with an interviewer also helps to remember facts more accurately. Closing your eyes when you think increases your chances of remembering facts accurately, according to researchers at the University of Surrey. Scientists tested people's ability to remember details of movies that show fake crime scenes.
Disposable items are already laundered when they arrive at cooperatives. Disposable cup production comes to consume 500 ml of water. In times of water scarcity, the need to revise water-saving habits has become a priority. Washing garbage before recycling is one that needs to be reviewed.
Species was named Campylocentrum insulare because of the island of SC. Discovery was cataloged and published in the journal Systematic Botany (USA). Researchers at the Federal University of Santa Catarina (UFSC) found in Florianopolis the smallest orchid flower ever identified in the world, with less than half a millimeter.
Harvard genetics has been successful in inserting genes from extinct species for over three millennia into an elephant's DNA. In ancient times, thousands of years ago, humanity lived with mammoths. During the last ice age, it was common for our ancestors to slaughter the woolly mammoth depicted in the image and enjoy its meat as food and also its bones as raw material for tools or works of art.
Scottish researchers have identified changes in sounds used by animals to order apples. Learning other languages is common for humans. But scientists consider the discovery that chimps are also able to understand different sounds of other primates. Scientists accompanied two groups of chimps that were put together at the Edinburgh Zoo (Scotland).
Scientists find that they dream about places they want to visit and, of course, food. According to University College London research, when they can't access their food, mice dream of it as soon as they have their eyes. "It's like looking at pictures of Greece the day before you take a vacation - that night you can dream about the pictures," says study author Hugo Spiers.
It is hypothesized that radiation contributed to changes in the blood. Local monkeys have fewer white and red blood cells. Blood tests on monkeys living in the Fukushima region after the nuclear catastrophe showed a lower presence of white and red blood cells, which could cause greater vulnerability in these primates, a study published on Thursday. July 2014) in the journal "Scientific Reports" of the "Nature" group.