scholarly journals Superproof about Sexual Reproduction and Life Cycle in the Parasitic Generation of Strongyloides stercoralis in Human Host

2016 ◽  
Vol 6 (1) ◽  
pp. 1-6
Author(s):  
Feleke Eriso
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Strongyloides Stercoralis ◽  
Human Host ◽  
Parasitic Generation

Life cycle of Spirogyra decimina var. juergensii (Kütz.) O.V. Petlovany from Lake Baikal

2018 ◽  
pp. 1-7
Author(s):  
Ekaterina A. Volkova
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Lake Baikal

Identification of Spirogyra species is based on the morphology of the fertile specimens. This work provides characteristics of growth and the time of reproduction of Spirogyra decimina var. juergensii in Lake Baikal and describes sexual reproduction and conditions for germination of new filaments of this species isolated from the lake.

Heterozygote advantage and the evolution of a dominant diploid phase.

Genetics ◽  
1992 ◽  
Vol 132 (4) ◽  
pp. 1195-1198 ◽  
Author(s):  
D B Goldstein
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Genetic Factor ◽  
Higher Plants ◽  
Heterozygote Advantage ◽  
Seed Plants ◽  
Sexual Species ◽  
Evolutionary Forces ◽  
Eukaryotic Species ◽  
Selection For

Abstract The life cycle of eukaryotic, sexual species is divided into haploid and diploid phases. In multicellular animals and seed plants, the diploid phase is dominant, and the haploid phase is reduced to one, or a very few cells, which are dependent on the diploid form. In other eukaryotic species, however, the haploid phase may dominate or the phases may be equally developed. Even though an alternation between haploid and diploid forms is fundamental to sexual reproduction in eukaryotes, relatively little is known about the evolutionary forces that influence the dominance of haploidy or diploidy. An obvious genetic factor that might result in selection for a dominant diploid phase is heterozygote advantage, since only the diploid phase can be heterozygous. In this paper, I analyze a model designed to determine whether heterozygote advantage could lead to the evolution of a dominant diploid phase. The main result is that heterozygote advantage can lead to an increase in the dominance of the diploid phase, but only if the diploid phase is already sufficiently dominant. Because the diploid phase is unlikely to be increased in organisms that are primarily haploid, I conclude that heterozygote advantage is not a sufficient explanation of the dominance of the diploid phase in higher plants and animals.

scholarly journals Observation of asexual reproduction with symbiont transmission in planktonic foraminifera

2020 ◽  
Vol 42 (4) ◽  
pp. 403-410 ◽  
Author(s):  
Haruka Takagi ◽  
Atsushi Kurasawa ◽  
Katsunori Kimoto
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Vertical Transmission ◽  
Asexual Reproduction ◽  
Planktonic Foraminifera ◽  
Gamete Release ◽  
Symbiotic Algae ◽  
Laboratory Cultures ◽  
Symbiont Transmission

Abstract Gamete release has been frequently observed in laboratory cultures of various species of planktonic foraminifera. Those observations have been taken as evidence that these organisms produce new generations exclusively by sexual reproduction. We report here the first observation of asexual reproduction in Globigerinita uvula, a small, microperforate foraminifera. The asexual phase was associated with the release of ca. 110 offspring, all of which hosted symbiotic algae that must have been passed on directly from the parent. This event was also the first observation of vertical transmission of symbionts in planktonic foraminifera. Although the trigger of the observed asexual reproduction and its frequency in nature remain unknown, our observation indicates that among the planktonic foraminifera, at least G. uvula has not abandoned the asexual phase of its life cycle.

Strongyloides stercoralis: Complete Life Cycle in SCID Mice

1995 ◽  
Vol 81 (1) ◽  
pp. 136-139 ◽  
Author(s):  
H.L. Rotman ◽  
W. Yutanawiboonchai ◽  
R.A. Brigandi ◽  
O. Leon ◽  
T.J. Nolan ◽  
...  
Keyword(s):  
Life Cycle ◽  
Strongyloides Stercoralis ◽  
Scid Mice ◽  
Complete Life Cycle

Sexual reproduction of Entomoneis cf. paludosa (Bacillariophyta)

2019 ◽  
pp. 194-196
Author(s):  
Yulia A. Podunay ◽  
Nickolai A. Davidovich ◽  
Olga I. Davidovich
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Pennate Diatom ◽  
Sexual Process

Sexual reproduction and the life cycle of the marine pennate diatom Entomoneis cf. paludosa are described. The reproduction in this species is characterized by morphological and behavioral isogamy. Two gametangia are involved in the sexual process, each of which produces two gametes.

Helminthic Infections

2010 ◽  
Author(s):  
Wesley C Van Voorhis
Keyword(s):  
Hydatid Cyst ◽  
Strongyloides Stercoralis ◽  
Life Cycles ◽  
Larva Migrans ◽  
Visceral Larva Migrans ◽  
Human Host ◽  
Intestinal Nematode ◽  
Helminthic Infections ◽  
Organ Systems ◽  
Infected Meat

Helminthic parasites are multicellular worms that possess differentiated organ systems. They (with a few exceptions) do not replicate in the human host, and they tend to elicit eosinophilia within the tissues and blood of infected humans. Helminthic parasites include nematodes (roundworms), cestodes (tapeworms), and trematodes (flukes). The major intestinal nematodes are roundworm, pinworm, hookworm, whipworm, and Strongyloides stercoralis. Trichinellosis is caused by five species of the nematode Trichinella and develops after ingestion of infected meat, usually pork or the meat of certain carnivores. Nematode infections of the major tissue are anisakiasis, visceral larva migrans,Angiostrongylus cantonensis infection, mammomonogamosis (syngamosis), gnathostomiasis, dracunculiasis, and filariasis. Trematode and cestode infections are also described in this chapter, including infections by fish, beef, and pork tapeworms, as well as cysticercosis. Disease from Paragonimus, Clonorchis, Fasciola, Fasciolopsis, and Schistosoma is covered. Echinococcus infection and hydatid cyst disease are discussed. Tables describe intestinal nematode infection and treatment and filarial parasites of humans. Figures illustrate a variety of helminthic parasites and their life cycles. This review contains 136 references.

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