نتایج جستجو برای: cyclical parthenogenesis algorithm
تعداد نتایج: 760872 فیلتر نتایج به سال:
A new algorithm for the tracking and cancellation of broadband sources in linear arrays employing baseband tapped delay line processing is presented and investigated. Using this technique, each broadband source is individually tracked in a cyclical timemultiplexed manner by steering a broadband null formed from the use of a tapped delay line filter with weights constrained to have maximally fla...
From the Department of Pediatric Gastroenterology (Hasosah), and Department of Pediatrics (Al-Johani), King Saud Bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Jeddah, Kingdom of Saudi Arabia. Address correspondence to: Dr. Mohammed Y. Hasosah, Department of Pediatric Gastroenterology, National Guard Hospital, King Saud Bin Abdulaziz University for Health Sciences,...
MASSIMO FRANCHI AND PAOLO PARUOLO PRELIMINARY VERSION Abstract. This paper presents an additive decomposition of the moving average representation of VAR processes into cyclical components. We give a de nition of cyclical component that encompasses seasonal components as well as (stationary) long-run and short-run uctuations. Each cyclical component is univariate and is characterized by a spect...
Parthenogenesis and Somatic cell nuclear transfer (SCNT) techniques, offer a unique approach to manipulate the genetic composition of derived human embryonic stem cells - an essential step if the full opportunities for disease modeling, drug discovery or individualized stem cell therapy are to be realized. The present study describes the use of sheep oocytes to acquire expertise and establish m...
Parthenogenesis, a natural form of asexual reproduction produced from unfertilized eggs, occurs in many insects in Hemiptera and Hymenoptera, but very rarely in Lepidoptera. The current study aimed to test the larval density dependent occurrence of parthenogenesis in potato tuber moth, Phthorimaea operculella (Zeller; Lepidoptera: Gelechiidae) under laboratory conditions. More than 10% of femal...
Asexual taxa often have larger ranges than their sexual progenitors, particularly in areas affected by Pleistocene glaciations. The reasons given for this 'geographical parthenogenesis' are contentious, with expansion of the ecological niche or colonisation advantages of uniparental reproduction assumed most important in case of plants. Here, we parameterized a spread model for the alpine butte...
Abstract Endosymbiotic bacteria can induce parthenogenesis in many haplo-diploid species, but little is known about their role asexual reproduction diplodiploids. Bacteria are essential for the lineages of springtails and booklice, possibly some weevils, whether they causative agent remains to be proven. This would require comparing unisexual forms closely related bisexual such model species ve...
Cyclic parthenogenesis (heterogony) is a widespread reproductive mode found in diverse taxa such as digenean trematodies, gall wasps, gall midges, aphids, cladocerans and rotifers. It is of particular interest as it combines the advantages of asexual reproduction (rapid population growth) and sexual reproduction (recombination). Usually sexual reproduction is initiated when or slightly before e...
Purpose. Investigation of cytogenetic aspects embryological processes in the culture immature apomictic embryos, breeding genotypes sugar beet with cytoplasmic sterility for differentiation and selection by gametophyte reduced parthenogenesis.
 Methods. Cytological, biotechnological, fluorescent cytophotometry, field, laboratory.
 Results. The features genesis embryos cells induced vi...
Generally,some booms in housing prices are followed by busts. One common phenomenon relating these changes is that the house price cycle is generally believed to the product of the short-run deviations from the long-run upward trends. The long-term cyclical fluctuation in Iran’s housing market was periodically occurred about every 6 years. Furthermore, Movements in house prices have significant...
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