Relevant bibliographies by topics / Worker polymorphism

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Worker polymorphism'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 June 2025

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Journal articles on the topic "Worker polymorphism"

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Hughes, William O. H., and Jacobus J. Boomsma. "Genetic polymorphism in leaf-cutting ants is phenotypically plastic." Proceedings of the Royal Society B: Biological Sciences 274, no. 1618 (2007): 1625–30. http://dx.doi.org/10.1098/rspb.2007.0347.

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Advanced societies owe their success to an efficient division of labour that, in some social insects, is based on specialized worker phenotypes. The system of caste determination in such species is therefore critical. Here, we examine in a leaf-cutting ant ( Acromyrmex echinatior ) how a recently discovered genetic influence on caste determination interacts with the social environment. By removing most of one phenotype (large workers; LW) from test colonies, we increased the stimulus for larvae to develop into this caste, while for control colonies we removed a representative sample of all wor
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Vidhu, V. V., and Evans D.A. "Molecular probe, colony structure and SEM of antennal sensillae substantiate intermediate workers of Oecophylla smaragdina (Fab.) as typical worker." ENTOMON 41, no. 4 (2016): 319–28. http://dx.doi.org/10.33307/entomon.v41i4.220.

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The polymorphic colony of arboreal weaver ant Oecophylla smaragdina Fabricius has three categories of workers designated as typical, major and minor. The colony structure fluctuated sharply with seasons but the numerical ratio of worker castes always remained as 65:25:10. Typical workers have highest number of sensillae/unit area on the terminal segment of antenna and all the above characters established their role in the colony different from major and minor workers. Microsatellite DNA analysis of worker castes indicated high degree of genetic diversity, heterozygocity and genetic polymorphis
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Thresiamma, Varghese. "Description of dealate of Myrmecina urbanii Tiwari (Hymenoptera: Formicidae) from Karnataka, India, with notes on worker castes." Halteres 9 (May 30, 2018): 45–56. https://doi.org/10.5281/zenodo.1255825.

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<strong>The dealate of the myrmicine ant, <em>Myrmecina</em> <em>urbanii</em>, is described. The genus <em>Myrmecina</em> is known to show queen polymorphism, wherein wingless &ldquo;intermorphs&rdquo; which are morphologically intermediate between gynomorphs and worker castes are known to occur and lay eggs. <em>M. urbanii</em> is known from worker castes only. In the present study, few workers, which are intermediate between queen and worker castes, are also observed. Based on the external morphology and morphometric measurements, variations across the worker castes are also discussed in thi
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Santiago, Fábio, Rafaele Tavares Silvestre, Ubirani Barros Otero, et al. "The association of three DNA repair genes polymorphisms on the frequency of chromosomal alterations detected by fluorescence in situ hybridization." International Archives of Occupational and Environmental Health 94, no. 7 (2021): 1567–77. http://dx.doi.org/10.1007/s00420-021-01652-8.

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Abstract Purpose Gas station workers (GSWs) are exposed to carcinogenic agents. The aim was to study the association of high somatic chromosome alterations (CAs) rates in the blood of GSWs and the polymorphisms of three genes playing a role in DNA double-strand break repair. Methods This is a cross-sectional study with 114 GSWs and 115 age-matched controls. Cytogenetic analyses, blood exams, medical interviews and genotypes for RAD51/G135C (rs1801320), ATM/P1054R (rs1800057) and CHEK2/T470C (rs17879961) genes were performed. Results The CA rate in GSWs was 9.8 CAs/1000 metaphases, and 19.1% of
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Kamhi, J. Frances, Kelley Nunn, Simon K. A. Robson, and James F. A. Traniello. "Polymorphism and division of labour in a socially complex ant: neuromodulation of aggression in the Australian weaver ant, Oecophylla smaragdina." Proceedings of the Royal Society B: Biological Sciences 282, no. 1811 (2015): 20150704. http://dx.doi.org/10.1098/rspb.2015.0704.

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Complex social structure in eusocial insects can involve worker morphological and behavioural differentiation. Neuroanatomical variation may underscore worker division of labour, but the regulatory mechanisms of size-based task specialization in polymorphic species are unknown. The Australian weaver ant, Oecophylla smaragdina , exhibits worker polyphenism: larger major workers aggressively defend arboreal territories, whereas smaller minors nurse brood. Here, we demonstrate that octopamine (OA) modulates worker size-related aggression in O. smaragdina . We found that the brains of majors had s
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Hasan, Aizhar Hamzih, Dhuha Salman Asker Aljuboory, Hawraa Hamid Hussein, and Mona N. Al-Terehi. "The High Lead Level Role in the DNA Repair RAD 18 and OGG1 Gene Polymorphism in Gasoline Station Workers." Asian Journal of Water, Environment and Pollution 20, no. 2 (2023): 17–22. http://dx.doi.org/10.3233/ajw230020.

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The DNA repair enzymes–heavy metal interaction is an interesting project that can help elucidate several diseases. The current study aims to assess the lead effect in the two DNA repair genes RAD-18 Arg302Gln (rs373572) and OGG1 Ser326Cys in Gasoline station workers. The output showed that work types were Gasoline supply worker with a high percentage (73.52%) than other groups (11.76% and 14.7%) for a maintenance worker and station employee, respectively, significant lead (p 0.010) increasing in station worker than the control group, and significant lead changes among work types groups (p 0.00
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Wills, Bill D., Scott Powell, Michael D. Rivera, and Andrew V. Suarez. "Correlates and Consequences of Worker Polymorphism in Ants." Annual Review of Entomology 63, no. 1 (2018): 575–98. http://dx.doi.org/10.1146/annurev-ento-020117-043357.

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Chiu, Ming-Chung, Wen-Jer Wu, and Li-Chuan Lai. "Carriers and cutters: size-dependent caste polyethism in the tropical fire ant (Solenopsis geminata)." Bulletin of Entomological Research 110, no. 3 (2019): 388–96. http://dx.doi.org/10.1017/s0007485319000750.

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AbstractBody size is an important life-history trait in eusocial insects which plays a key role in colony fitness. The division of labour, represented by caste polyethism, correlates with divergent morphological traits. Size polymorphism has been noted in the tropical fire ant, Solenopsis geminata; however, little is known regarding the differences in the size distributions of workers performing foraging tasks. In the present study, task partitioning was observed in the foraging activities of S. geminata. Two subgroups among foraging workers of S. geminata were discovered using the Gaussian mi
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Holman, Luke. "Bumblebee size polymorphism and worker response to queen pheromone." PeerJ 2 (September 30, 2014): e604. http://dx.doi.org/10.7717/peerj.604.

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Wheeler, Diana E. "The Developmental Basis of Worker Caste Polymorphism in Ants." American Naturalist 138, no. 5 (1991): 1218–38. http://dx.doi.org/10.1086/285279.

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Dissertations / Theses on the topic "Worker polymorphism"

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Huang, Ming Hua. "Extreme Worker Polymorphism in the Big-headed Pheidole Ants." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/247257.

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Polymorphism is the existence of multiple phenotypes within a given species in a population. In social insects, worker polymorphism plays a key role in maximizing the effectiveness of the division of labor. Some ants have an extreme form of worker polymorphism where workers have a broad size range and multiple size modes. Pheidole ants, for example, consist of both highly polymorphic species as well as those with relatively low polymorphism. Here, we examined why different Pheidole species have different degrees of polymorphism and how polymorphism is produced. We thoroughly characterized the
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Glazier, Robert Udell. "Antioxidant Polymorphisms and Susceptibility to Solvent- Induced Hearing Loss in Factory Workers." Yale University, 2010. http://ymtdl.med.yale.edu/theses/available/etd-03052010-143503/.

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Occupational exposure-related hearing loss is a significant health concern for affected workers. Organic solvent exposure has emerged as an important contributor to hearing loss. It is thought that hearing loss related to solvent and noise exposure is mediated by reactive oxygen species (ROS). The glutathione associated enzymes and the manganese superoxide dismutase enzymes (SOD2) are important components of the cochlear hair cellâs defense against oxidative stress. This study is aimed to determine whether polymorphisms within the glutathione S-transferases (GST) P1 and GSTM1, glutathione pero
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Patel, Nirav D., Kanishka Chakraborty, Garrett Messmer, Koyamangalath Krishnan, and John B. Bossaer. "Severe Sunitinib-Induced Myelosuppression in a Patient with a CYP 3A4 Polymorphism." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/2330.

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Sunitinib, an oral vascular endothelial growth factor receptor, is a first-line option for metastatic renal cell carcinoma and widely used in clinical practice. Despite the proven benefit of sunitnib in metastatic renal cell carcinoma, patients may suffer from a variety of adverse events including hypertension, fatigue, hypothyroidism, hand?foot skin reactions, rash, depigmentation, and myelosuppression. Myelosuppression is usually mild, transient and resolves during the two weeks at the end of each cycle where no drug is taken. We present a case of severe and early grade 3 neutropenia and thr
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Wagle, John P., Kevin M. Carroll, Aaron J. Cunanan, et al. "Preliminary Investigation Into the Effect of ACTN3 and ACE Polymorphisms on Muscle and Performance Characteristics." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/4663.

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The purpose of this investigation was to explore the phenotypic and performance outcomes associated with ACTN3 and ACE polymorphisms. Ten trained men (age = 25.8 ± 3.0 years, height = 183.3 ± 4.1 cm, body mass = 92.3 ± 9.3 kg, and back squat to body mass ratio = 1.8 ± 0.3) participated. Blood samples were analyzed to determine ACTN3 and ACE polymorphisms. Standing ultrasonography images of the vastus lateralis (VL) were collected to determine whole muscle cross-sectional area (CSA-M), and a percutaneous muscle biopsy of the VL was collected to determine type I–specific CSA (CSA-T1), type II–sp
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Davis, Jennifer A. "Role of TNF-alpha polymorphism -308 in Irritant Contact Dermatitis and Neurosensory Response." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1267453650.

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CARREON-VALENCIA, TANIA. "EFFECT OF GENETIC POLYMORPHISMS OF METABOLIC ENZYMES ON BENZIDINE-INDUCED BLADDER CANCER IN CHINESE WORKERS: A NESTED CASE-CONTROL STUDY." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1006796728.

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Lu, Jia-Yi, and 呂家宜. "Metallothionein-1A Gene Polymorphism impacts Renal Function in chronic Lead-Exposed Workers." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5a9sn2.

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碩士<br>高雄醫學大學<br>公共衛生學系公共衛生學碩士班<br>106<br>Introduction and aims: Lead is widely used in occupational environments and can enter the body through many ways, accumulate in tissues, affecting nerves, hematopoiesis, reproductive system etc. The nephrotoxicity caused by lead exposure will damage the proximal tubule and hurt the renal function. Some studies have shown that different genotypes have different susceptibility to lead. The aim of this study was to investigate the relationship between MT1A nucleotide polymorphism and renal function in chronic lead exposure workers. Methods: The chronic lea
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Chen, Hsin-I., and 陳心怡. "The Relation Between Metallothionein (MT) Gene Polymorphism and Biomarkers on Lead-exposed Workers." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/28500926682044880746.

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碩士<br>高雄醫學大學<br>職業安全衛生研究所碩士班<br>94<br>Objective：To investigate the variance among different Metallothionein 1A (MT1A) genotypes and the effects on biomarkers in lead workers. Materials and Methods：The subjects are lead workers from two plants in Taiwan. We obtained their annual health examination data and their renal function markers. The questionnaire information which contains demographic data, smoking, alcohol, and food consumptions was also collected. We extracted DNA from blood, and amplified DNA with real-time PCR, then verified the sequence of these DNA products. We obtained the MT1A g
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Kao, Yun-Ting, and 高韻婷. "Gene polymorphisms and malondialdehyde levels in workers exposed to cooking oil fumes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65625334782306437587.

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碩士<br>高雄醫學大學<br>生物醫學檢驗學研究所碩士班<br>96<br>In Taiwan, Chinese restaurant cooks work more than 6 hours per day in the kitchen. They suffer serious health problems by being exposed to indoor air pollution arising from the cooking oil fumes (COF) in their daily lives. Several studies have established the presence of oxidative stress in cooking oil fumes, but the determinants of oxidative stress in cooking workers population and especially the contribution of the genotype of the xenobiotics- metabolizing enzymes (XME) to the observed oxidative stress are incompletely understood study. The aim of this
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Ho, Shu-Fen, and 何淑棻. "Association between Genetic Polymorphism and Biomakers in Workers Exposed to 4,4'-methylene-bis(2-chloroaniline)." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/96685402280809289918.

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碩士<br>國防醫學院<br>公共衛生學研究所<br>94<br>(4, 4 methylene-bis(2- chloroaniliene); MBOCA) is used as curing agent in isocyanate polymer and epoxy resin. The chemical constitution of MBOCA is similar to benzidine (A1 carcinogen ). Due to limited evidence of carcinogenicity to human, MBOCA is considered to be a suspected carcinogen (A2) by American Conference of Governmental Industrial Hygienist (ACGIH), and is considered to be probably carcinogenic to human by International Agency of Research on Cancer (IARC). Recent studies have reported that workers exposed to MBOCA may lead to bladder cancer in Taiwan
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Books on the topic "Worker polymorphism"

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Lappano, E. R. Morphological Study of Larval Development in Polymorphic All-Worker Broods of the Army Ant Eciton Burchelli. Creative Media Partners, LLC, 2021.

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Gephart, Werner; Witte, ed. The Sacred and the Law: The Durkheimian Legacy. Klostermann, 2017. http://dx.doi.org/10.5771/9783465142942.

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There is little doubt about the importance of Emile Durkheim’s work and the influence it had on the social sciences. His insights into the realms of normativity in particular remain an inspiring mine of information for theoretical reflection and empirical analyses. While his strengths, as we know nowadays, might not have always laid in systematic arguments, his main concerns have shaped the development of social thought in fundamental ways: the question of changing social bonds and the problem of integration; belief and unbelief in societal values; acceptance and rejection of the law, obligati
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Godderis, Lode. Cancer Risk Assessment at the Workplace: Cancer Risk of Workers Exposed to Styrene & the Influence of Genetic Polymorphisms of Enzymes Involved in Metabolism & DNA Repair (Acta Biomedica Lovaniensia). Leuven Univ Pr, 2006.

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Divan, Aysha, and Janice A. Royds. 2. DNA. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723882.003.0002.

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Another significant milestone was the publication in 2003 of the complete sequence of the human genome—the entire DNA contained within the forty-six chromosomes located in the nucleus of each human somatic (body) cell. Once this was published, further worldwide projects were launched to work out what the functions of these genes and other regions of the genome actually were. ‘DNA’ outlines the components of the human genome and their organization; DNA replication; mutations and correction mechanisms; polymorphisms; and new DNA technologies, including gene cloning, the polymerase chain reaction
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Phillips, Lynne. Genders, Spaces, Places. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190846626.013.193.

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The concepts of gender, space, and place have significant social and political implications for the kind of world that people inhabit and the kinds of lives we can lead. That there has been a transformation in thinking about these concepts is indicated in references today to pluralized (and polymorphic) spaces, to the waxing, and waning of distinctions between space and place, and to the idea that gender, space, and place are something produced rather than simply lived in, or ventured into. These subtle shifts hint at a complex history of ideas about what constitutes gender, space, and/or plac
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Book chapters on the topic "Worker polymorphism"

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Molet, Mathieu. "Worker Polymorphism." In Encyclopedia of Social Insects. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-90306-4_138-1.

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Molet, Mathieu. "Worker Polymorphism: Ants." In Encyclopedia of Social Insects. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-28102-1_138.

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Ye, Wenjia, and Bruno C. d. S. Oliveira. "Pragmatic Gradual Polymorphism with References." In Programming Languages and Systems. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30044-8_6.

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AbstractGradualizing System F has been widely discussed. A big challenge is to preserve relational parametricity and/or the gradual guarantee. Most past work has focused on the preservation of parametricity, but often without the gradual guarantee. A few recent works satisfy both properties by giving up System F syntax, or with some restrictions and the introduction of sophisticated mechanisms in the dynamic semantics.While parametricity is important for polymorphic languages, most mainstream languages typically do not satisfy it, for a variety of different reasons. In this paper, we explore the design space of polymorphic languages that satisfy the gradual guarantee, but do not preserve parametricity. When parametricity is not a goal, the design of polymorphic gradual languages can be considerably simplified. Moreover, it becomes easy to add features that are of practical importance, such as mutable references. We present a new gradually typed polymorphic calculus, called $$\lambda ^{G}_{gpr}$$ λ gpr G , with mutable references and with an easy proof of the gradual guarantee. In addition, compared to other gradual polymorphism work, $$\lambda ^{G}_{gpr}$$ λ gpr G is defined using a Type-Directed Operational Semantics (TDOS), which allows the dynamic semantics to be defined directly instead of elaborating to a target cast language. $$\lambda ^{G}_{gpr}$$ λ gpr G and all the proofs in this paper are formalized in Coq.
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Kim, Kyoung Ah, Yong-Yeun Cho, Jung Sik Cho, et al. "Tumor necrosis factor-α gene promoter polymorphism in coal workers’ pneumoconiosis." In Oxygen/Nitrogen Radicals: Cell Injury and Disease. Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-1087-1_23.

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Bonabeau, Eric, Marco Dorigo, and Guy Theraulaz. "Introduction." In Swarm Intelligence. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195131581.003.0005.

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Insects that live in colonies, ants, bees, wasps, and termites, have fascinated naturalists as well as poets for many years. “What is it that governs here? What is it that issues orders, foresees the future, elaborates plans, and preserves equilibrium?,” wrote Maeterlinck [230]. These, indeed, are puzzling questions. Every single insect in a social insect colony seems to have its own agenda, and yet an insect colony looks so organized. The seamless integration of all individual activities does not seem to require any supervisor. For example, Leafcutter ants (Atta) cut leaves from plants and trees to grow fungi. Workers forage for leaves hundreds of meters away from the nest, literally organizing highways to and from their foraging sites [174]. Weaver ant (Oecophylla) workers form chains of their own bodies, allowing them to cross wide gaps and pull stiff leaf edges together to form a nest. Several chains can join to form a bigger one over which workers run back and forth. Such chains create enough force to pull leaf edges together. When the leaves are in place, the ants connect both edges with a continuous thread of silk emitted by a mature larva held by a worker [172, 174]. In their moving phase, army ants (such as Eciton) organize impressive hunting raids, involving up to 200,000 workers, during which they collect thousands of prey (see chapter 2, section 2.2.3) [52, 269, 282]. In a social insect colony, a worker usually does not perform all tasks, but rather specializes in a set of tasks, according to its morphology, age, or chance. This division of labor among nestmates, whereby different activities are performed simultaneously by groups of specialized individuals, is believed to be more efficient than if tasks were performed sequentially by unspecialized individuals [188, 272]. In polymorphic species of ants, two (or more) physically different types of workers coexist. For example, in Pheidole species, minor workers are smaller and morphologically distinct from major workers.
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Siddiqui, Surayya, Sridevi I. Puranik, Aimen Akbar, and Shridhar C. Ghagane. "Genetic Polymorphism and Prostate Cancer: An Update." In Genetic Polymorphisms - New Insights [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99483.

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Genetic polymorphism and prostate cancer (PC) are the most pernicious and recurrently malignancy worldwide. It is the most dominating cause of cancer related casualty among men in the US. Asian countries are inflicted with PC at an alarming rate though still the prevalence of PC is lower than European and American men. Some of the genetic and environmental factors that might play a role in PC risk include: age genetic predilection, family history, race/ethnicity, lifestyle, and dietary habits and non-dietary environmental risk factors such as smoking. Socio-economic factors including economic, scholastic and intellectual factors do not, intrinsically seem to straight away influence the risk of acquiring PC. Other genetic changes that may support an increased risk of developing PC include HPC1, HPC2, HPCX, CAPB, ATM,s HOXB13 and mismatch repair genes. PC occurrence rates are highly variable. Almost all PC mortalities are due to metastatic disease, generally through tumors the progress to be hormone refractory or castrate resistant. PC, developing research has acknowledged a number of candidate genes and biological pathways associated with PC. Indirect pathways such as P13K/AKT signaling pathway is one of most well known alternate pathway in PC Vascular endothelial growth factor (VEGF) is widely known to be potent stimulator of angiogenesis. The over expression of EGFR in a very large majority of cases is accompanied by the succession of PC, implying that this may play a mechanistic role. Numerous occupational factors have been proposed to cause PC. Some of the risk factors include; farmers/agricultural workers, pesticides, shift work and flight personnel. PC treatment can be done through surgery, radical prostatectomy is the main type of surgery. Risks of injury are many – reactions to anesthesia, loss of blood, blood clumps in the legs/lungs, injury to surrounding organs, infection at the site of surgery and many more. The other treatments are hormone therapy, chemotherapy and radio therapy chemotherapy. Chemotherapeutic drugs are typically used one at a time for PC such as transurethral resection of prostate (TURP). Some of the chemotherapeutic drugs are Docetaxel, Cabazitaxel, Mitoxantrone and Estramustine. Among the score of biomarkers being studied, numerous markers and techniques deserve awareness and acceptability for both patients and urologists in clinical practice.
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Roisin, Yves. "Selective pressures on pleometrosis and secondary polygyny: a comparison of termites and ants." In Queen Number and Sociality in Insects. Oxford University PressOxford, 1993. http://dx.doi.org/10.1093/oso/9780198540571.003.0017.

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Abstract Highly organized and ecologically successful societies have evolved convergently in both termites and ants. These societies are characterized by large numbers of individuals and a great complexity with respect to social polymorphism, constructions, communications, foraging behaviour, etc. Perhaps the most important feature of these societies, from an evolutionary viewpoint, is the reproductive division of labour. In many ant and termite colonies, the egg-laying function is restricted to one or a few reproductive female(s), the queen(s). Polygyny, i.e. the coexistence of several functional queens in a colony, has considerable effects on intra-nest relatedness. Moreover, it generates conflicts of interests among these queens, in addition to possible conflicts between queens and non-reproductive individuals (workers, soldiers). Polygynous colonies are therefore of high interest for testing predictions derived from kin-selection theory.
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Jolivet, Jean-Pierre. "Titanium, Manganese, and Zirconium Dioxides." In Metal Oxide Nanostructures Chemistry. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190928117.003.0011.

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The dioxides of titanium (TiO2), manganese (MnO2), and zirconium (ZrO2) are important materials because of their technological uses. TiO2 is used mainly as white pigment. Because of its semiconducting properties, TiO2, in its nanomaterial form, is also used as an active component of photocells and photocatalysis for self-cleaning glasses and cements . MnO2 is used primarily in electrode materials. ZrO2 is used in refractory ceramics, abrasive materials, and stabilized zirconia as ionic conductive materials stable at high temperature. Many of these properties are, of course, dependent on particle size and shape (§ Chap. 1). Dioxides of other tetravalent elements with interesting properties have been studied elsewhere in this book, especially VO2, which exhibits a metal–isolator transition at 68°C, used, for instance, in optoelectronics (§ 4.1.5), and silica, SiO2 (§ 4.1.4), which is likely the most ubiquitous solid for many applications and uses. Aqueous chemistry is of major interest in synthesizing these oxides in the form of nanoparticles from inorganic salts and under simple, cheap, and envi­ronmental friendly conditions. However, as the tetravalent elements have re­stricted solubility in water (§ 2.2), metal–organic compounds such as titanium and zirconium alkoxides are frequently used in alcoholic solution as precursors for the synthesis of TiO2 and ZrO2 nanoparticles. An overview of the conversion of alkoxides into oxides is indicated about silica formation (§ 4.1.4), and since well-documented works have already been published, these compounds are not considered here. The crystal structures of most MO2 dioxides are of TiO2 rutile type for hexacoordinated cations (e.g., Ti, V, Cr, Mn, Mo, W, Sn, Pb) and CaF2 fluorite type for octacoordinated, larger cations (e.g., Zr, Ce), but polymorphism is common. Some dioxides of elements such as chromium and tin form only one crystal­line phase. So, hydrolysis of SnCl4 or acidification of stannate [Sn(OH)6]2− leads both to the same rutile-type phase, cassiterite, SnO2. Many other dioxides are polymorphic, especially TiO2, which exists in three main crystal phases: anatase, brookite, and rutile; and MnO2, which gives rise to a largely diversified crystal chemistry.
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Crossland, Susan, David Coates, John Grahame, and Peter J. Mill. "The littorina saxatilis species complex — interpretation using random amplified Polymorphic DNAs." In Origin and Evolutionary Radiation of the Mollusca. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780198549802.003.0017.

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Abstract The Littorina saxatilis species complex comprises four recognised species. Littorina saxatilis (Olivi), L. arcana Hannaford Ellis and L. nigrolineata Gray are generally recognised as ‘good’ species by most workers since Hannaford Ellis (1978) described L. arcana as a separate species. The status of L. neglecta Bean has, however, been called into question by several workers (B. Johannesson and K. Johannesson, 1990; K. Johannesson and B. Johannesson; 1990, Reid, 1993), who have suggested that L. neglecta represents an extreme ecomorph of L. saxatilis. Previous work on the species complex has been ambiguous in separating Littorina saxatilis and L. arcana into genetically distinct groups (e.g. Knight, Hughes and Ward, 1987; Mill and Grahame, 1988; Knight and Ward, 1991). However, their different reproductive modes, for example, provide clear evidence for separation at the species level. Morphometric analysis is confounded by ecological variance, with exposed shore morphs differing from sheltered shore morphs.
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Roulstone, Alan. "Disability, work and welfare: the disappearance of the polymorphic productive landscape." In Disabled People, Work and Welfare. Policy Press, 2015. http://dx.doi.org/10.56687/9781447318354-018.

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Conference papers on the topic "Worker polymorphism"

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Flaten, Ellen Marie, Xiaoguang Ma, Marion Seiersten, Charlotte Aanonsen, Ralf Beck, and Jens-Petter Andreassen. "Impact of Monoethylene Glycol and Fe2+ on Crystal Growth of CaCO3." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05770.

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Abstract Calcium carbonate is one of the most abundant minerals precipitating during gas production. This work is focused on precipitation of CaCO3 in presence of Monoethylene glycol (MEG), used as hydrate inhibitor. MEG is known to affect the thermodynamics of calcium carbonate and this study shows that it has a large impact on the precipitation kinetics. The whole precipitation process has been investigated including polymorphism, induction times, nucleation rates and growth rates. Growth rate is emphasized as it has a large impact on both induction time and transformation rate from metastab
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Flaten, Ellen Marie, Marion Seiersten, Ralf Beck, Charlotte Aanonsen, and Jens-Petter Andreassen. "Precipitation of Calcium Carbonate in Monoethylene Glycol and Water." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-4047.

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Abstract Calcium carbonate is one of the most abundant minerals precipitating during gas production. This work is focused on precipitation of CaCO3 in presence of Monoethylene glycol (MEG), used as hydrate inhibitor. MEG is known to affect the thermodynamics of calcium carbonate and the results show that it also has a large impact on the precipitation kinetics. The whole precipitation process has been investigated including polymorphism, induction times, nucleation rates and growth rates. Emphasize has been on growth rate as it is most important and has a large impact on both induction time an
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Tjelta, M., and J. Kvarekvål. "Electrochemistry of Iron Sulfide and Its Galvanic Coupling to Carbon Steel in Sour Aqueous Solutions." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07478.

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Abstract Iron sulfide, frequently found on carbon steel under sour conditions, is under certain circumstances expected to act as a (large area) cathode thereby increasing the corrosion rate of the underlying steel through galvanic coupling. In the present work electrochemical reactions taking place at electrodes of different iron sulfide polymorphs (namely troilite, pyrrhotite and pyrite) in sour aqueous solutions have been studied using electrochemical techniques. Also, the effect of galvanic coupling between different iron sulfides and steel electrodes has been investigated. The results show
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Sanni, Olujide, Ogbemi Bukuaghangin, Wassim Taleb, et al. "Mechanisms and Polymorphic Transformation of Calcium Carbonate Inorganic Scale in Oil-Water Emulsion." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17876.

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ABSTRACT Studying the kinetics of scale formation on the surface and in the bulk of the fluid when the oil phase is present has not yet received much attention. The impact of adding an oil phase to both surface deposition and bulk precipitation is not clear and needs to be studied. This work studies the mechanisms and behavior of precipitation of calcium carbonate scale in the presence of oil - water emulsion. A total of 100ml of different oil fractions including cyclohexane, kerosene, toluene and asphaltene is introduced to a vessel with 1000ml of brine at temperature, T=30°C. Using the Rotat
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Wylde, J. J., and I. G. Winning. "Challenges and Solutions Associated with the Development of an Iron Scale Dissolver Chemistry." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04730.

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Abstract Further work has been undertaken on the continued to develop a novel chemistry to dissolve iron scale deposits. Laboratory tests showed promising results when applied to actual field deposits with very high dissolution and low corrosion rates. The novel dissolver blend is based upon Tetrakishydroxymethylphosphonium sulphate (THPS), yet little is understood about this chemistry and the synergies it displays. Laboratory studies have been performed investigating the various synergies, the effect of pH, concentration of components and the use of alternative chemistries to THPS. Many types
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Caetano, Geovanna Cota, Julia Assis Rodrigues, Patrícia Aguiar Bellini, Clécio Ênio Murta de Lucena, Renata Toscano Simões, and Valéria Cristina Sandrim. "EVALUATION OF CYP2D6 POLYMORPHISM IN PATIENTS WITH BREAST CANCER AND TAMOXIFEN USERS OF TWO BREAST SERVICES OF BELO HORIZONTE." In Brazilian Breast Cancer Symposium 2022. Mastology, 2022. http://dx.doi.org/10.29289/259453942022v32s2031.

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Objective: This study aimed to assess the CYP2D6*4 polymorphism and the association of this polymorphism with the evolution of breast cancer since the reduction of the CYP2D6 activity due to polymorphisms of the gene that encodes the enzyme or the use of inhibitory drugs has been linked to reduced levels of endoxifen (EDF) and worse prognosis in women treated with tamoxifen (TAM). The treatment is multidisciplinary; TAM is an established and important therapeutic modality. This drug is metabolized by the CYP2D6 enzyme into its active metabolites, 4-hydroxytamoxifen (HTF), and EDF. Methods: The
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Карпушкина, Т. В., Н. А. Свеженцева, М. С. Форнара, Н. В. Бардуков, Н. Ф. Бакоев, and О. В. Костюнина. "EVALUATION OF THE INFLUENCE OF THE ESR1 DNA MARKER ON THE REPRODUCTION QUALITIES OF LARGE WHITE AND LANDRACE PIGS." In Биотехнология в растениеводстве, животноводстве и сельскохозяйственной микробиологии. Crossref, 2021. http://dx.doi.org/10.48397/arriab.2021.21.xxi.020.

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Исследования полиморфизма в генe ESR1 представляют интерес в связи с ассоциацией с хозяйственно-полезными признаками свиней. Целью данной работы явилось исследование влияния полиморфизма гена ESR1 на изменчивость воспроизводительных качеств свиней пород крупная белая и ландрас. Studies of polymorphism in the ESR1 gene are of interest in connection with the association with economically useful traits of pigs. The purpose of this work was to study the effect of ESR1 gene polymorphism on the variability of the reproductive qualities of Large White and Landrace pigs.
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Imran, Iffat. "Analysis Of Organo Chlorine Pesticides (OCPs) Toxicity For CYP1A1A1384G Polymorphism In Agricultural Workers." In International Conference on Biological Research and Applied Science. Jinnah University for Women, Karachi,Pakistan, 2022. http://dx.doi.org/10.37962/ibras/2022/54-55.

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Surniyantoro, Harry Nugroho Eko, Devita Tetriana, Teja Kisnanto, et al. "Association of C-262T (rs1001179) genetic polymorphism and catalase level in medical radiation workers." In INTERNATIONAL CONFERENCE ON NUCLEAR SCIENCE, TECHNOLOGY, AND APPLICATIONS – ICONSTA 2022. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0193386.

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Baldanova, D. R., T. R. Khamnueva, and Z. N. Dugarov. "ACANTHOCEPHALANS IN WATERFOWLS OF LAKE BAIKAL." In THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL. All-Russian Scientific Research Institute for Fundamental and Applied Parasitology of Animals and Plant – a branch of the Federal State Budget Scientific Institution “Federal Scientific Centre VIEV”, 2023. http://dx.doi.org/10.31016/978-5-6048555-6-0.2023.24.67-72.

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The purpose of this work was to clarify the species composition of acanthocephalans&#x0D; of Baikal waterbirds and to determine their relative abundance in modern&#x0D; environmental conditions. Ninety nine specimens of 13 species of waterfowls were&#x0D; studied by the method of special and complete dissection in Lake Baikal. Birds were&#x0D; studied according to the method given in the work by M. N. Dubinina. Three species&#x0D; of acanthocephalans were recorded: Polymorphus minutus (Goeze, 1782), P. acutis&#x0D; Van Cleave et Starret, 1940, and P. magnus Skrjabin, 1913. To assess the quanti
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Reports on the topic "Worker polymorphism"

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Sadka, Avi, Mikeal L. Roose, and Yair Erner. Molecular Genetic Analysis of Citric Acid Accumulation in Citrus Fruit. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7573071.bard.

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The acid content of the juice sac cells is a major determinant of maturity and fruit quality in citrus. Many citrus varieties accumulate acid in concentrations that exceed market desires, reducing grower income and consumer satisfaction. Pulp acidity is thought to be dependent on two mechanisms: the accumulation of citric acid in the vacuoles of the juice sac cells, and acidification of the vacuole. The major aim of the project was to direct effort toward understanding the mechanism of citric acid accumulation in the fruit. The following objectives were suggested: Measure the activity of enzym
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Reisch, Bruce, Pinhas Spiegel-Roy, Norman Weeden, Gozal Ben-Hayyim, and Jacques Beckmann. Genetic Analysis in vitis Using Molecular Markers. United States Department of Agriculture, 1995. http://dx.doi.org/10.32747/1995.7613014.bard.

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Genetic analysis and mapping in grapes has been difficult because of the long generation period and paucity of genetic markers. In the present work, chromosome linkage maps were developed with RAPD, RFLP and isozyme loci in interspecific hybrid cultivars, and RAPD markers were produced in a V. vinifera population. In three cultivars, there were 19 linkage groups as expected for a species with 38 somatic chromosomes. These maps were used to locate chromosome regions with linkages to important genes, including those influencing powdery mildew and botrytis bunch rot resistance; flower sex; and be
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Tzin, V., B. Dilkes, and H. Sela. Identifying molecular markers for defense metabolites against aphid feeding in wild emmer wheat. United States-Israel Binational Agricultural Research and Development Fund, 2021. http://dx.doi.org/10.32747/2021.8134174.bard.

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Bread wheat is the second most important food crop, providing calories to half of the world population and roughly one-fifth of the calories and protein consumed by people worldwide. Crop losses to insect pests depress yields and climate change is expected to significantly increase this problem. To combat global food insecurity, the protection of crops from insect pests must be prioritized. The Bird cherry-oat aphid, Rhopalosiphum padi, is the most abundant and economically important cereal pest, causes up to 40-60 % yield loss through direct feeding and vectoring plant diseases. The main goal
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Blum, Abraham, and Henry T. Nguyen. Molecular Tagging of Drought Resistance in Wheat: Osmotic Adjustment and Plant Productivity. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7580672.bard.

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Drought stress is a major limitation to bread wheat (Triticumaestivum L.) productivity and its yield stability in arid and semi-arid regions of world including parts of Israel and the U.S. Currently, breeding for sustained yields under drought stress is totally dependent on the use of yield and several key physiological attributes as selection indices. The attempt to identify the optimal genotype by evaluating the phenotype is undermining progress in such breeding programs. Osmotic adjustment (OA) is an effective drought resistance mechanism in many crop plants. Evidence exists that there is a
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Bennett, Alan B., Arthur A. Schaffer, Ilan Levin, Marina Petreikov, and Adi Doron-Faigenboim. Manipulating fruit chloroplasts as a strategy to improve fruit quality. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7598148.bard.

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The Original Objectives were modified and two were eliminated to reflect the experimental results: Objective 1 - Identify additional genetic variability in SlGLK2 and IPin wild, traditional and heirloom tomato varieties Objective 2 - Determine carbon balance and horticultural characteristics of isogenic lines expressing functional and non-functional alleles of GLKsand IP Background: The goal of the research was to understand the unique aspects of chloroplasts and photosynthesis in green fruit and the consequences of increasing the chloroplast capacity of green fruit for ripe fruit sugars, yiel
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Sherman, Amir, Rebecca Grumet, Ron Ophir, Nurit Katzir, and Yiqun Weng. Whole genome approach for genetic analysis in cucumber: Fruit size as a test case. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7594399.bard.

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The Cucurbitaceae family includes a broad array of economically and nutritionally important crop species that are consumed as vegetables, staple starches and desserts. Fruit of these species, and types within species, exhibit extensive diversity as evidenced by variation in size, shape, color, flavor, and others. Fruit size and shape are critical quality determinants that delineate uses and market classes and are key traits under selection in breeding programs. However, the underlying genetic bases for variation in fruit size remain to be determined. A few species the Cucurbitaceae family were
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Abbott, Albert G., Doron Holland, Douglas Bielenberg, and Gregory Reighard. Structural and Functional Genomic Approaches for Marking and Identifying Genes that Control Chilling Requirement in Apricot and Peach Trees. United States Department of Agriculture, 2009. http://dx.doi.org/10.32747/2009.7591742.bard.

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Structural and functional genomic approaches for marking and identifying genes that control chilling requirement in apricot and peach trees. Specific aims: 1) Identify and characterize the genetic nature of chilling requirement for flowering and dormancy break of vegetative shoots in Prunusgermplasm through the utilization of existing apricot (NeweYa'ar Research Center, ARO) and peach (Clemson University) genetic mapping populations; 2) Use molecular genetic mapping techniques to identify markers flanking genomic regions controlling chilling; 3) Comparatively map the regions controlling chilli
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Michelmore, Richard, Eviatar Nevo, Abraham Korol, and Tzion Fahima. Genetic Diversity at Resistance Gene Clusters in Wild Populations of Lactuca. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7573075.bard.

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Genetic resistance is often the least expensive, most effective, and ecologically-sound method of disease control. It is becoming apparent that plant genomes contain large numbers of disease resistance genes. However, the numbers of different resistance specificities within a genepool and the genetic mechanisms generating diversity are poorly understood. Our objectives were to characterize diversity in clusters of resistance genes in wild progenitors of cultivated lettuce in Israel and California in comparison to diversity within cultivated lettuce, and to determine the extent of gene flow, re
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Eyal, Yoram, and Sheila McCormick. Molecular Mechanisms of Pollen-Pistil Interactions in Interspecific Crossing Barriers in the Tomato Family. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7573076.bard.

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During the evolutionary process of speciation in plants, naturally occurring barriers to reproduction have developed that affect the transfer of genes within and between related species. These barriers can occur at several different levels beginning with pollination-barriers and ending with hybrid-breakdown. The interaction between pollen and pistils presents one of the major barriers to intra- and inter-specific crosses and is the focus of this research project. Our long-term goal in this research proposal was defined to resolve questions on recognition and communication during pollen-pistil
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