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Diagnosis of oxyuris equi

Chişinău, str.

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Academiei, l, etaj 3, birou Secţia de Ştiinţe Naturale şi Exacte tel. Tiraj Tipografia AŞM, str. În locul de origine fiecare specie nouă apărută intră în interdependenţă cu alte specii ale biocenozelor succesive și nu ar putea supraviețui și evolua în cazul în care nu funcționează unele mecanisme de autoreglare, care nu permit creșterea exponențială a unei specii și excizia altora.

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Dacă o specie-producător devine ținta unui grup de specii fitofage, acestea nu pot mouth warts nhs producătorul din natură, deoarece ar pune în pericol propria existență pe de o parte, iar pe de altă parte, populațiile de specii fitofage sunt de asemenea controlate de mulțimi de specii zoofage, asigurând un echilibru în natură.

În acest sens aducem dovezi obținute în cercetări de aproape o jumătate de secol și se referă la unele specii de dăunători care atacă culturile de Brassica oleracea var. Cuvinte cheie: specii, biosemiotică, mulțime, biocenoze parasitoide, biocenoze de entomofagi. This means that diagnosis of oxyuris equi species cannot live alone, but it must enter into relationship with other species in the biocoenosis of which it depends on.

In other words, each species depends in its existence on other species that ensure their existence and control its own existence. The famous geneticist Nicholas Vavilov perfectly intuited that a species cannot survive and evolve but in interrelation with other species that depend on each other in their existence.

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Vavilov believes that the place diagnosis of oxyuris equi which a species occurs and evolves is its world genetic centre. This means that each species has a proper evolution, resulting in geological time from the interrelations established with other species in the successive ecosystems in which it evolved along time. The essence of this concept is that a species cannot be isolated from the complex of species in the middle of diagnosis of oxyuris equi it develops its existence.

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If a species belongs to the category of producers, it means that it can become the target of a complex of phytophagous species that depend in diagnosis of oxyuris equi existence on that producer. The phytophagous species might eliminate the respective producer from nature, if they multiply exponentially. Such elimination does not occur in nature, or it is produced under extreme conditions, because the phytophagous species would put their existence into danger, on the one hand, and on the other hand, these would become the target of the attack of some zoophagous species, which control their populations, ensuring the survival of the producer.

The complex interrelationships do 4 5 Articole de fond not stop here because the zoophagous species of first order may become the target of some zoophagous species of the second order, and, these, in their turn, diagnosis of oxyuris equi some zoophagous species of higher order or of peak figure 1at a time when we speak about predatory species, diagnosis of oxyuris equi in case of the parasitoid species one can form tertiary particularly complex food chains, such as: primary parasitoids secondary parasitoids tertiary parasitoids quaternary parasitoids figure 2 [10].

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In nature, it functions a series of self-adjustment mechanisms within each biological system. In the present case such mechanisms might function according to the models render below: Figure diagnosis of oxyuris equi.

Self-adjustment mechanism of predatory type. Figure 2. Self-adjustment mechanism of parasitoid type. Such self-adjustment mechanisms do not allow the exponential growth of some species and the extinction of others. Only in such a way, we can explain the survival of some species in geological time in the world genetic centre of a species.

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Moved from this centre, the species may face some difficulties or can achieve exponential multiplication The case of the species Leptinotarsa decemlineata Say and Plutella xylostella L. Thinking in this way, we can imagine the species Brassica oleracea var.

diagnosis of oxyuris equi

The phytophagous species also become the target of some zoophagous species predatory or parasitoid that control their populations thus providing a natural biological balance. In this way, we can imagine that around a predatory species it acts a swarm of phytophagous species, closely followed by parasitoid and predatory swarms.

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All of these swarms revolve around a predatory species as an intrinsic part of the respective species. Thus, when we think of the species Brassica oleracea var. Forcing the thinking, we might consider that the cabbage has the ecological mission to ensure the existence of some phytophagous species.

So, in nature, virus del papiloma humano caracteristicas del virus, where we find cabbage plants it is natural almost obligatory to meet some phytophagous species, too, as if they would belong to the species. Accepting this possibility we realize that the broad sphere of the producing species extends incorporating the predatory and parasitoid swarms too; it is as if the producing species were a swarm of species swarms.

Thus, we arrive to the biosemiotic diagnosis diagnosis of oxyuris equi oxyuris equi of Jasper Hoffmeyer, who, in the 7 th biosemiotic principle, postulates that the organisms are a swarm of swarms of papiloma humano definition. It is about pluricellular organisms, to which swarms of cells form different types of tissues, and these give rise to other swarms that are the organs that make up the organisms as a unitary whole, which is a swarm of swarms of cells depending in their existence on each other and on the whole the respective being forms [1, 2].

Why do we not apply this principle in the case of biological and ecological species? The species appears to us as a swarm of species swarms depending in their existence on each other.

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Thus, thinking we realize the biosemiotic dimensions of the species that become unexpected. Results and discussions To ensure the understanding of the concept according to which a species is a swarm of swarms of species, we bring some arguments based on our research of nearly half a century referring to the knowledge of the complexes of pests and natural diagnosis of oxyuris equi that control some crops of Brassica oleracea var.

Cabbage is a cosmopolitan species that accompanies man everywhere. It is native to the Mediterranean zone, which means that here it is found the world genetic centre of this species, but it expanded its area almost diagnosis of oxyuris equi the whole planet.

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Normally, the Brassica oleracea var. Not really; not all the species have the same ecological valences. The biggest density of phytophagous species is found in the native zone. However, in this area we will meet both the complexes of predators and the parasitoids which provide a certain biological balance. In Romania, Brassica oleracea var.

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Being near the world genetic centre, the cabbage should not be put in danger of extinction. And, though, some crops diagnosis of oxyuris equi cabbage may be totally destroyed in some areas, as a result of the environmental ecological imbalances caused by the chemical controlling activity against pests. But, if in a certain area some cabbage crops may be compromised, in other areas they can resist to the attack and even thrive.

Conditions vary from one area to another and from one period to another.

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In our research, we followed a number of species of phytophagous insects that attack the cabbage crops and the complexes of entomophages that diagnosis of oxyuris equi their populations. In this regard, we will only put into discussion just some of these species: Brevicoryne brassicae L. These species are the most damaging species, but they are controlled, in the conditions of Romania, by strong complexes of entomophages.

Brevicoryne brassicae is a species particularly harmful in certain conditions; it may compromise totally some cabbage crops. The big number of generations per year over 20 and the very high prolificacy of virginogenous females make possible the exponential growth of this species at the time when it is not controlled.

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