نتایج جستجو برای: gametes life cycle

تعداد نتایج: 977826  

2015
Michael L. Brosnahan Lourdes Velo‐Suárez David K. Ralston Sophia E. Fox Taylor R. Sehein Alexi Shalapyonok Heidi M. Sosik Robert J. Olson Donald M. Anderson

Transitions between life cycle stages by the harmful dinoflagellate Alexandrium fundyense are critical for the initiation and termination of its blooms. To quantify these transitions in a single population, an Imaging FlowCytobot (IFCB), was deployed in Salt Pond (Eastham, Massachusetts), a small, tidally flushed kettle pond that hosts near annual, localized A. fundyense blooms. Machine-based i...

Journal: :Human reproduction update 2000
J J Tarín S Pérez-Albalá A Cano

The present review aims to analyse (i) the molecular, biochemical and cellular changes that accompany oocyte and sperm ageing in any of the internal or external environments where they can reside, and (ii) the consequences of the abnormal function in ageing gametes on pre- and post-implantation development and later life of offspring. This review also aims to propose and discuss cellular/molecu...

Journal: :Theoretical population biology 1983
A Rogers

Feldman and Cavalli-Sforza (Theoret. Pop. Biol. (1979), 15, 276-307; (1981), 19, 370-377) have emphasized the role of the segregation variance in models of assortative mating for continuous characters. This note examines its behavior in the context of a general additive model. Using known results concerning the effects of assortative mating and selection on genic variance and correlations among...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
E L Smith

Journal: :international journal of environmental research 2015
f. o. ogundipe o. d. jimoh

waste is a by-product of our daily activities, which poses a serious threat to societies all over the world. in this study, life cycle assessment (lca) methodology was used to determine municipal solid waste (msw) management strategy for minna, niger state, nigeria. three scenarios were modelled as alternatives to the current waste management system in minna. the baseline scenario was the exist...

Journal: :international journal of environmental research 0
a. lo giudice department of quality and operations management, faculty of engineering and the built environment, university of johannesburg, johannesburg, south africa c. mbohwa department of quality and operations management, faculty of engineering and the built environment, university of johannesburg, johannesburg, south africa m.t. clasadonte department of economics and business, university of catania, catania, italy c. ingrao external collaborator of the department of economics and business, university of catania, catania, italy

this paper presents the results obtained from the life cycle assessment (lca) of the productionof sicilian artichokes (cynara scolymus) with the aim of reducing impacts, interpreting the results, suggesting possible improvements and enriching the sustainability knowledge already existing in the agro food field. artichokes represent one of the excellent italian agricultural products even if stil...

Journal: :iranian journal of environmental sciences 0
gholamreza asadollahfardi civil engineering department, kharazmi university, tehran, iran azadeh panahandeh civil engineering department, kharazmi university, tehran, iran amir ali khalvati civil engineering department, kharazmi university, tehran, iran ali sekhavati civil engineering department, kharazmi university, tehran, iran

transportation is an important part of modern community life as well as one of the largest sources of greenhouse gas emissions in urban communities, the population growth of which can increase transportation capacity. monorail systems are relatively new rail transportation systems which are currently being designed and constructed in different countries. we have applied the intergovernmental pa...

Journal: :iranian journal of parasitology 0
hakim azizi dept. of parasitology and mycology, school of public health, tehran university of medical sciences, tehran, iran ali farahnak dept. of parasitology and mycology, school of public health, tehran university of medical sciences, tehran, iran iraj mobedi dept. of parasitology and mycology, school of public health, tehran university of medical sciences, tehran, iran mohamadbagher molaei rad dept. of parasitology and mycology, school of public health, tehran university of medical sciences, tehran, iran

background: human echinostomiasis is an intestinal disease caused by the members of family echinostomatidae parasites. the aim of present research was to identify echinos­tomatidae cercariae emitted by lymnaea palustris snails from mazandaran province in the north of iran based on the morphological and morphometrical charac­teristics of the different stages of experimental parasite life cycle. ...

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