Early cytologists believed that the inside of the living cell was filled with a smooth, viscous fluid into which the nucleus was immersed. This fluid is called cytoplasm (from the Greek kytos, cell, and plasma, that which forms, which shapes). It is now known that the space between the plasma membrane and the nucleus is quite different than those pioneer cytologists imagined.
Leptospirosis is a bacterial disease that affects humans and animals, caused by bacteria of the genus Leptospira. It is transmitted by water and food contaminated by the urine of animals, especially the rat. It is a very common disease after floods, as people walk unprotected in contaminated waters.
It is also called schist, or snail disease. It is triggered by a worm called schistosome. Worms live in the veins of the intestines and can cause diarrhea, weight loss, belly pain, which increases a lot of volume (water belly), and problems in various organs of the body. The eggs of the schistosome come out along with the feces of the infected person.
Surface Tension Another feature of liquid water is the tension it represents on its surface. This is because water molecules attract, staying together (together), as if they formed a very thin surface membrane. Look at the picture below. Pascal's Principle Pascal was a French scientist who lived from 1623 to 1662.
It is a flexible ring, covered by a thin rubber membrane, that the woman should place in the vagina to cover the cervix. As a barrier, it prevents sperm from entering and should be used together with a spermicide no later than 6 hours prior to sexual intercourse. Patient compliance depends on the correct use of the device.
Sex may also result in illness. These are sexually transmitted diseases (or STDs) that can be transmitted from a contaminated person to a healthy person during sexual intercourse. While it is true that we can say that some diseases that affect man are still inevitable today, as is the case with some cancers, we believe that the same does not apply to sexually transmitted diseases, STDs.
From puberty, the body of boys and girls is able to bear children. But having children is a very serious decision. Caring for a child requires conditions that adolescents often lack. Babies and children need constant care, caring and guidance from responsible adults with available time and financial conditions to raise them.
Float or sink? Ever wonder why some objects sink in water? Why does a nail sink and a ship float on water? What makes water support some objects so that they can float on it? Understanding why some objects sink in water while others float is very important in building ships, submarines, etc.
These methods prevent the sperm from rising to the uterus and are critical in preventing STDs and AIDS. Condom or condom Almost everyone can use it; protects against sexually transmitted diseases, including AIDS; prevents cervical diseases; it is not bad for your health; It is within easy reach.
The sponges are made of polyurethane, are adapted to the cervix with handle for removal and are disposable (unlike the diaphragm). They are associated with spermicides, which are chemicals that immobilize and destroy sperm and can also be used in combination with the diaphragm or preservatives.
Oxygen gas is a gas of fundamental importance to the vital processes of our planet, used in the breathing of most living things. Algae and plants also absorb oxygen in respiration, but, through photosynthesis, release this gas, enabling its continuous renewal in the environment.
If we know it's going to rain, we take the umbrella when we leave the house. But an important tip about time helps us in many other things. Among them, to assess road conditions when we travel, and also for agriculture. Farmers often need to plant at the beginning of a rainy season because seeds need water to germinate.
Vasectomy and tubal ligation Sterilization (vasectomy and tubal ligation) is a definitive surgical contraceptive method. It is performed in women through ligation or cutting of the tubes, preventing the meeting of male and female gametes. In men, it is performed by ligating or cutting the vas deferens (vasectomy), which prevents the presence of sperm in the ejaculated fluid.
In addition to the hormonal methods presented in the previous topics, we can mention three more, which are: - Hormonal implant - Vaginal ring - Contraceptive patch Follow the description of each of them. Hormonal Implant Microbason of progesterone-like synthetic hormone, which is implanted in the forearm (with local anesthesia) and inhibits ovulation.
Meteorological stations record and analyze changes in atmospheric conditions using equipment they use, such as thermometers, hygrometers, anemometers, rainfall, etc. In these stations the meteorologists work, professionals who study, among other things, the atmospheric conditions.
It predominates in the northern hemisphere, eastern United States, western Europe, eastern Asia, Korea, Japan and parts of China. The amount of radiant energy is higher and rainfall reaches 750 to 1,000 mm, distributed throughout the year. Clear seasons of the year. In this biome, most shrubs and trees lose their leaves in the fall and animals migrate, hibernate, or have special adaptations to withstand the intense cold.
It is an industrial facility used to generate electricity / electricity from heat-released energy, usually through the combustion of some type of renewable or non-renewable fuel. Other forms of electricity generation are solar, wind or hydropower.
The so-called density-dependent factors are those that prevent excessive population growth due to the large number of individuals in a given population: disputes over space, food, sexual partner eventually lead to decreased reproductive rate and increased mortality.
Parasitism is a more common form of inharmonious relationship than antibiosis. It characterizes the species that settles in the body of another, removing matter for its nutrition and consequently causing damage that can vary in severity, from minor disturbances to the death of the parasitized individual.
Inharmonious interspecific relations between different species in the same community have the same or very similar ecological niches, triggering a dispute mechanism for the same environmental resource, when it is not sufficient for both populations. This mechanism can determine density control of the two populations that are interacting, extinction of one of them or even specialization of the ecological niche.