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Vasanthanathan Poongavanam, Jacob Kongsted
The high rate of drug resistance as well as the complex biochemical process of the parasite reproduction cycle makes development of new drugs for malaria a very important but challenging task. Falcipain 2 (FL2) and Falcipain 3 (FL3) are the major cysteine protease enzymes that play a central role in providing essential amino acids for the parasite's protein biosynthesis through the hemoglobin hydrolysis process. Selective inhibition of these enzymes is considered as a promising chemotherapeutic target. In the present investigation, the highly efficient linear interaction energy (LIE) method has been parameterized for binding affinity predictions and assessed with a set of 244 compounds for FL2 and FL3 inhibition...
June 26, 2016: Journal of Molecular Graphics & Modelling
Zhenyang Yu, Guohua Sun, Yanjun Liu, Daqiang Yin, Jing Zhang
Trans-generational effects are increasingly used to indicate long-term influences of environmental pollutants. However, such studies can be complex and yield inconclusive results. In this study, the trans-generational effects of sulfamethoxazole (SMX) on Caenorhabditis elegans on lifespan, reproduction and population growth were tested for 7 consecutive generations, which included gestating generation (F0), embryo-exposed generation (F1), germline-exposed generation (F2), the first non-exposed generation (F3) and the three following generations (F4-F6)...
October 19, 2016: Ecotoxicology and Environmental Safety
Paula Sosenski, Sergio Ramos-Castro, César A Domínguez, Karina Boege, Juan Fornoni
The evolution of monomorphisms from heterostylous ancestors has been related with the presence of homostyly and the loss of self-incompatibility allowing the occurrence of selfing, which could be advantageous under pollinator limitation. However, flowers of some monomorphic species show herkogamy, attraction and rewarding traits that presumably favour cross-pollination and/or a mixed mating system. This study evaluated the contributions of pollinators, breeding system and floral traits to the reproduction of Turnera velutina, a herkogamous monomorphic species...
October 22, 2016: Plant Biology
Guaraci D Cordeiro, Mardiore Pinheiro, Stefan Dötterl, Isabel Alves-Dos-Santos
Bees are the most important diurnal pollinators of angiosperms. In several groups of bees a nocturnal/crepuscular habit was developed, yet, little is known about their role in pollination and whether some plants are adapted specifically to these bees. We used a multidisciplinary approach to investigate the reproductive biology and to understand the role of nocturnal/crepuscular bees in pollination of Campomanesia phaea (Myrtaceae), popularly named cambuci. We studied the floral biology and the breeding system of C...
October 22, 2016: Plant Biology
Verónica María Corrales-Carvajal, Aldo A Faisal, Carlos Ribeiro
Internal states can profoundly alter the behavior of animals. A quantitative understanding of the behavioral changes upon metabolic challenges is key to a mechanistic dissection of how animals maintain nutritional homeostasis. We used an automated video tracking setup to characterize how amino acid and reproductive states interact to shape exploitation and exploration decisions taken by adult Drosophila melanogaster. We find that these two states have specific effects on the decisions to stop at and leave proteinaceous food patches...
October 22, 2016: ELife
M Butsashvili, M Kajaia, M Kochlamazashvili, M Zarandia, T Gagua, D Meskhishvili, N Avaliani, G Kamkamidze
Of the 100 types of human papillomaviruses (HPV), approximately 35 infect the genital tract. The viruses are categorized as "high risk" and "low risk" depending on whether they are known to cause cancer or not. Cervical cancer is an important cause of cancer mortality in Georgia, and worldwide. Only limited and incomplete data are available about the epidemiology of HPV infection and related molecular and cellular changes in Georgia. Objectives of our study included the estimation of the prevalence and the distribution of HPV genotypes among women in Georgia...
September 2016: Georgian Medical News
Gisele Cristiane de Melo Dias, Mônica Cassel, Lázaro Wender Oliveira de Jesus, Sergio Ricardo Batlouni, Maria Inês Borella
Prochilodus lineatus is an important representative of the order Characiformes and a species that offers great advantages to fish farming. Therefore, detailed knowledge of its reproductive biology can be applied to various fields of production and biotechnology. In this study, we have identified testicular germ cells during spermatogenesis and have evaluated the volumetric proportion of the testes occupied by structures of the tubular and intertubular compartments. In addition, the individual volume of type A spermatogonia was measured and used to estimate the mean number of these cells per testis...
October 22, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
Daniel Shane Wright, Nicolle Demandt, Jeroen T Alkema, Ole Seehausen, Ton G G Groothuis, Martine E Maan
Local adaptation can be a potent force in speciation, with environmental heterogeneity leading to niche specialization and population divergence. However, local adaption often requires non-random mating in order to generate reproductive isolation. Population divergence in sensory properties can be particularly consequential in speciation, affecting both ecological adaptation and sexual communication. Pundamilia pundamila and Pundamilia nyererei are two closely related African cichlid species that differ in male coloration, blue vs...
October 22, 2016: Journal of Evolutionary Biology
Sheryl de Lacey
Perspectives on the status of human embryos and whether they should be discarded differ globally. Some countries protect embryos in law while in other countries embryos 'die' or 'succumb' in assisted reproductive technology clinics on a daily basis. This study analyses interview data drawn from a larger qualitative study conducted in South Australia from 2004-2007. 21 women and 12 of 21 partners were interviewed about the decision they made to discard their embryos. The analysis reported here sought to examine the ways in which women constructed and experienced the decision to discard embryos...
October 22, 2016: Sociology of Health & Illness
Doanh Nguyen-Ngoc, Thuy Nguyen-Phuong
We investigate a system of two species exploiting a common resource. We consider both abiotic (i.e. with a constant resource supply rate) and biotic (i.e. with resource reproduction and self-limitation) resources. We are interested in the asymmetric competition where a given consumer is the locally superior resource exploiter (LSE) and the other is the locally inferior resource exploiter (LIE). They also interact directly via interference competition in the sense that LIE individuals can use two opposite strategies to compete with LSE individuals: we assume, in the first case, that LIE uses an avoiding strategy, i...
October 21, 2016: Acta Biotheoretica
Mara A Schonberg, Vicky W Li, A Heather Eliassen, Roger B Davis, Andrea Z LaCroix, Ellen P McCarthy, Bernard A Rosner, Rowan T Chlebowski, Susan E Hankinson, Edward R Marcantonio, Long H Ngo
PURPOSE: Accurate risk assessment is necessary for decision-making around breast cancer prevention. We aimed to develop a breast cancer prediction model for postmenopausal women that would take into account their individualized competing risk of non-breast cancer death. METHODS: We included 73,066 women who completed the 2004 Nurses' Health Study (NHS) questionnaire (all ≥57 years) and followed participants until May 2014. We considered 17 breast cancer risk factors (health behaviors, demographics, family history, reproductive factors) and 7 risk factors for non-breast cancer death (comorbidities, functional dependency) and mammography use...
October 21, 2016: Breast Cancer Research and Treatment
Luca Mannini, Flavia Sorbi, Ivo Noci, Viola Ghizzoni, Federica Perelli, Mariarosaria Di Tommaso, Alberto Mattei, Massimiliano Fambrini
PURPOSE: The main aim of this study was to evaluate the incidence of endometriosis and intrahepatic cholestasis (ICP) and induction of labor in pregnant women with endometriosis compared with women without endometriosis. The secondary aim was to confirm increased incidence of already known endometriosis-related pregnancy complications in these patients. METHODS: This is a retrospective cohort study performed at a tertiary hospital between January 2009 and December 2014 to compare obstetrics outcome between women with endometriosis and women without endometriosis...
October 21, 2016: Archives of Gynecology and Obstetrics
Akihisa Kangawa, Masayoshi Otake, Satoko Enya, Toshinori Yoshida, Masatoshi Shibata
Microminipigs are becoming increasingly attractive alternatives for various experimental applications, such as general toxicology studies, owing to their manageable size. However, there are limited studies on the male reproductive organs of microminipigs, particularly on the histological aspects of sexual maturity. To clarify the development of male reproductive organs, 35 male microminipigs, aged 0 to 12 months, were used in this study. Histological and histomorphological evaluation was performed based on spermatogenic development, measurement of tubular structure in testes and epididymides, and histological progress of accessory glands...
October 21, 2016: Toxicologic Pathology
Louise Hetherington, Elena Schneider, Caroline Scott, David DeKretser, Charles H Muller, Hubert Hondermarck, Tony Velkov, Mark A Baker
Globally, approximately 1 in 15 men of reproductive age are infertile, yet the precise mechanisms underlying their gamete failure are unknown. Although a semen-analysis is performed to determine fertilizing potential, the diagnostic suitability of this analysis has been questioned in several reports, as many men, classified as "infertile" according to their semen analysis, subsequently turn out to be fertile. Herein, we have used a quantitative (phospho)-proteomic analysis, using enrichment on titanium dioxide followed by ion-trap mass spectrometry (LC-MS/MS), to compare the semen of infertile versus fertile males...
October 21, 2016: Molecular & Cellular Proteomics: MCP
Stephanie Robins, Helena J Barr, Rachel Idelson, Sylvie Lambert, Phyllis Zelkowitz
BACKGROUND: Many men lack knowledge about male infertility, and this may have consequences for their reproductive and general health. Men may prefer to seek health information online, but these sources of information vary in quality. OBJECTIVE: The objective of this study is to determine if online sources of information regarding male infertility are readable, suitable, and of appropriate quality for Internet users in the general population. METHODS: This study used a cross-sectional design to evaluate online sources resulting from search engine queries...
October 21, 2016: Interactive Journal of Medical Research
Pengfei Fan, Yang Liu, Zhechun Zhang, Chao Zhao, Cheng Li, Wulin Liu, Zhijin Liu, Ming Li
The white-cheeked macaque Macaca leucogenys is a recently described species that was only diagnosed based on photos, without any specimen measurements or molecular genetic diagnosis. Using extracted DNA from four newly collected skin specimens, we studied the genetic diversity and phylogenetic position of M. leucogenys using multilocus sequence data, including mitochondrial and Y chromosomal genes. Skin measurements of four individuals showed that the white-cheeked macaque is robust and larger than M. assamensis but is similar in body size to M...
October 18, 2016: Molecular Phylogenetics and Evolution
V Rougeron, T De Meeûs, A-L Bañuls
One key process of the life cycle of pathogens is their mode of reproduction. Indeed, this fundamental biological process conditions the multiplication and the transmission of genes and thus the propagation of diseases in the environment. Reproductive strategies of protozoan parasites have been a subject of debate for many years, principally due to the difficulty in making direct observations of sexual reproduction (i.e. genetic recombination). Traditionally, these parasites were considered as characterized by a preeminent clonal structure...
October 18, 2016: Infection, Genetics and Evolution
Manisha Balwani, Preeti Singh, Anju Seth, Ekta Malik Debnath, Hetanshi Naik, Dana Doheny, Brenden Chen, Makiko Yasuda, Robert J Desnick
Acute Intermittent Porphyria (AIP), an autosomal dominant inborn error of heme metabolism, typically presents in adulthood, most often in women in the reproductive age group. There are limited reports on the clinical presentation in children, and in contrast to the adults, most of the reported pediatric cases are male. While acute abdominal pain is the most common presenting symptom in children, seizures are commonly seen and may precede the diagnosis of AIP. As an example, we report a 9year old developmentally normal pre-pubertal boy who presented with acute abdominal pain, vomiting and constipation followed by hyponatremia, seizures, weakness and neuropathy...
October 15, 2016: Molecular Genetics and Metabolism
Hanna R Goldberg, Lisa Allen, Sari Kives
BACKGROUND: Fetiform teratoma, a highly differentiated mature cystic teratoma resembling a fetus, is rare and typically found in the ovaries of women of reproductive age. This report describes the youngest case of ovarian fetiform teratoma. CASE: A 7-year-old female presented with acute abdominal pain. Radiological examinations revealed a 5.2 cm ovarian complex cystic mass with fetal-like components in favour of fetus-in-fetu (FIF) and teratoma. Following surgical removal, the mass resembled a fetus consisting of a head, two eye slits, two small upper limb projections, and hair...
October 18, 2016: Journal of Pediatric and Adolescent Gynecology
Soyoung Kim, Jonggul Lee, Eunok Jung
A mathematical model for the transmission dynamics of the 2009 A/H1N1 influenza epidemic in the Republic of Korea is developed. The simulation period is separated into three consecutive periods based on the government's intervention strategies: the nonpharmaceutical strategy is used during Period 1. The nonpharmaceutical and antiviral strategies are executed during Period 2 and the vaccine strategy is added during Period 3. During Period 1, we estimate the reduction in the transmission rate due to the government's intervention policies as a difference between the data-fitted and uncontrolled transmission rate that is derived from the basic reproductive number, R0, of the model without intervention...
October 18, 2016: Journal of Theoretical Biology
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