keyword
MENU ▼
Read by QxMD icon Read
search

Ovulation

keyword
https://www.readbyqxmd.com/read/29029246/the-epidermal-growth-factor-network-role-in-oocyte-growth-maturation-and-developmental-competence
#1
Dulama Richani, Robert B Gilchrist
BACKGROUND: The LH surge induces great physiological changes within the preovulatory follicle, which culminate in the ovulation of a mature oocyte that is capable of supporting embryo and foetal development. However, unlike mural granulosa cells, the oocyte and its surrounding cumulus cells are not directly responsive to LH, indicating that the LH signal is mediated by secondary factors produced by the granulosa cells. The mechanisms by which the oocyte senses the ovulatory LH signal and hence prepares for ovulation has been a subject of considerable controversy for the past four decades...
September 20, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29028291/reproductive-biology-of-aechmea-bracteata-sw-griseb-bromelioideae-bromeliaceae
#2
Manuel Pool-Chalé, Ivón Ramírez-Morillo, Germán Carnevali Fernández-Concha, Claudia T Hornung-Leoni
Individuals of Aechmea bracteata show inflorescences with red scape bracts and odorless, yellow, tubular, diurnal flowers, with closely-arranged sexual organs, producing a large amount of fruits. In order to investigate the reproductive system of this species, a suite of characters were assessed: phenology, floral morphology and biology, nectar production dynamics, and fruit and seed production and germination, as a result of controlled pollination crosses. The study was conducted during two flowering seasons in wild populations in Yucatán, Mexico...
October 13, 2017: Plant Biology
https://www.readbyqxmd.com/read/29028104/the-influence-of-ovulation-induction-and-assisted-conception-on-maternal-and-perinatal-outcomes-of-twin-pregnancies
#3
G Bordi, A D'Ambrosio, I Gallotta, L Di Benedetto, A Frega, F Torcia, M Schimberni, M Bonito, D Caserta
OBJECTIVE: To compare obstetrical and neonatal outcomes of twin pregnancies conceived via assisted reproductive technology (ART) with those of naturally conceived ones and to investigate the influence of the ART procedure type on these parameters. PATIENTS AND METHODS: This observational study included 450 ART and 647 spontaneous twin pregnancies delivered over 15 years at a single university-based hospital of Rome, Italy. Logistic and linear regression models adjusted for confounding factors were used to evaluate the effect of ART and the type of assisted conception (IVF/ICSI, ovulation induction ± intrauterine insemination, egg/embryo donation) on maternal and perinatal outcomes...
September 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29028068/more-than-euglossines-the-diverse-pollinators-and-floral-scents-of-zygopetalinae-orchids
#4
Carlos E P Nunes, Marina Wolowski, Emerson Ricardo Pansarin, Günter Gerlach, Izar Aximoff, Nicolas J Vereecken, Marcos José Salvador, Marlies Sazima
Floral volatile organic compounds (VOCs) play important roles in plant-pollinator interactions. We investigated the reproductive ecology and floral VOCs of Zygopetalinae orchids to understand the relationship between floral scents and pollinators. We performed focal observations, phenological censuses and breeding system experiments in eight species in southeast Brazil. Floral scents were collected and analysed using SPME/GC-MS. We performed multivariate analyses to group species according to affinities of their VOCs and define compounds associated to each plant...
October 13, 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/29025057/nqo2-inhibition-relieves-ros-effects-on-mouse-oocyte-meiotic-maturation-and-embryo-development
#5
Dandan Chen, Xin Li, Xiaoyun Liu, Xiaoyu Liu, Xiuying Jiang, Juan Du, Qian Wang, Yuanjing Liang, Wei Ma
NRH: quinone oxidoreductase 2 (NQO2) is a cytosolic and ubiquitously expressed flavoprotein that catalyzes the two-electron reduction of quinone to hydroquinones. Herein, we assessed the protein expression, subcellular localization and possible functions of NQO2 in mouse oocyte meiotic maturation and embryo development. Western blot analysis detected high and stable protein expression of NQO2 in mouse oocytes during meiotic progression. Immunofluorescence illustrated NQO2 distribution on nuclear membrane, chromosomes and meiotic spindles...
September 4, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29025011/significance-of-epidermal-growth-factor-receptor-signaling-for-acquisition-of-meiotic-and-developmental-competence-in-mammalian-oocytes
#6
Radek Prochazka, Milan Blaha, Lucie Nemcová
The surge in luteinizing hormone (LH) in preovulatory ovarian follicles triggers the resumption of oocyte meiosis accompanied by expansion of surrounding cumulus cells and ovulation of cumulus-oocyte complexes (COCs) into the oviduct. Over the last 15 years, substantial progress has been made in elucidating the key pathways by which the LH signal spreads within the preovulatory follicle and in identifying the molecules responsible for maintaining oocyte arrest and meiosis resumption. It is now clear that the adenylcyclase-mediated rise in intracellular cAMP leads to activation of the epidermal growth factor receptor (EGFR) network in granulosa and cumulus cells...
August 31, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29024378/the-cyclocalyx-study-ovulatory-cycle-affects-circulating-compartments-of-the-endothelial-glycocalyx-in-blood
#7
Nikolai Hulde, Nina Rogenhofer, Florian Brettner, Nicole C Eckert, Isabella Götzfried, Thu Nguyen, Judith-I Pagel, Tobias Kammerer, Klaus F Hofmann-Kiefer, Gustav Schelling, Andreas Dendorfer, Markus Rehm, Christian J Thaler
PROBLEM: The endothelial glycocalyx (EGX) plays an important role in vascular integrity. Recently, increased levels of EGX components were detected in the circulating blood of healthy pregnant women and were related to the increased tendency to edema formation during gestation. However, the EGX has not yet been systematically studied in non-pregnant women during ovulatory cycles. METHOD OF STUDY: Serum levels of EGX components syndecan-1, heparan sulfate, and hyaluronan in healthy women (n = 16) at 3 phases of the ovulatory cycle (early follicular phase, at ovulation, and mid-luteal phase) were compared with a control group of healthy men (n = 10)...
October 11, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29021177/men-s-preferences-for-women-s-body-odours-are-not-associated-with-human-leucocyte-antigen
#8
Fabian Probst, Urs Fischbacher, Janek S Lobmaier, Urs Wirthmüller, Daria Knoch
Body odours reportedly portray information about an individual's genotype at the major histocompatibility complex (MHC, called human leucocyte antigen, HLA, in humans). While there is strong experimental support for MHC-associated mating behaviour in animals, the situation in humans is more complex. A lot of effort has been spent on testing HLA-associated odour preferences of women. To date, only very few studies have looked at HLA-linked olfactory preferences in men and these studies have revealed inconsistent results...
October 11, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29018364/cloning-and-functional-characterization-of-oct%C3%AE-2-receptor-and-tyr1-receptor-in-the-chagas-disease-vector-rhodnius-prolixus
#9
Sam Hana, Angela B Lange
Octopamine and tyramine, both biogenic amines, are bioactive chemicals important in diverse physiological processes in invertebrates. In insects, octopamine and tyramine operate analogously to epinephrine and norepinephrine in the vertebrates. Octopamine and tyramine bind to G-protein coupled receptors (GPCRs) leading to changes in second messenger levels and thereby modifying the function in target tissues and insect behavior. In this paper, we report the cDNA sequences of two GPCRs, RhoprOctβ2-R, and RhoprTyr1-R, have been cloned and functionally characterized from Rhodnius prolixus...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29018155/clinical-characteristics-of-138-chinese-female-patients-with-idiopathic-hypogonadotropic-hypogonadism
#10
Rui-Yi Tang, Rong Chen, Miao Ma, Shou-Qing Lin, Yi-Wen Zhang, Ya-Ping Wang
OBJECTIVE: To evaluate the clinical features of Chinese women with idiopathic hypogonadotropic hypogonadism (IHH). METHODS: We retrospectively reviewed the clinical characteristics, laboratory and imaging findings, therapeutic management, and fertility outcomes of 138 women with IHH. All patients had been treated and followed-up at an academic medical centre during 1990-2016. RESULTS: Among the 138 patients, 82 patients (59.4%) were diagnosed with normosmic IHH and 56 patients (40...
October 10, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/29017868/rates-of-anovulation-in-adolescents-and-young-adults-with-moderate-to-severe-primary-dysmenorrhea-and-those-without-primary-dysmenorrhea
#11
Laura C Seidman, Kathleen M Brennan, Andrea J Rapkin, Laura A Payne
OBJECTIVE: To evaluate rates of presumptive anovulation in eumenorrheic adolescents and young adults with moderate to severe primary dysmenorrhea and those without primary dysmenorrhea. PARTICIPANTS: Thirty-nine adolescents and young adults (ages 16-24) with primary dysmenorrhea and 52 age-matched controls. DESIGN: Participants completed luteinizing hormone surge ovulation predictor test kits. Anovulatory cycles were defined by never receiving a positive result prior to the next menstrual period; participants were grouped as anovulatory if they experienced at least one anovulatory cycle during study participation...
October 7, 2017: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/28994115/the-effect-of-fertility-treatment-on-adverse-perinatal-outcomes-in-women-aged-at-least-40-years
#12
Avi Harlev, Asnat Walfisch, Eynan Oran, Iris Har-Vardi, Michael Friger, Eitan Lunenfeld, Eliahu Levitas
OBJECTIVE: To compare perinatal outcomes between spontaneous conception and assisted reproductive technologies (ART) among patients of advanced maternal age. METHODS: The present retrospective study included data from singleton pregnancies of women aged at least 40 years who delivered between January 1, 1991, and December 31, 2013, at Soroka University Medical Center, Beer Sheva, Israel. Demographic, obstetric, and perinatal data were compared between pregnancies conceived with ART (in vitro fertilization [IVF] or ovulation induction) and those conceived spontaneously...
October 10, 2017: International Journal of Gynaecology and Obstetrics
https://www.readbyqxmd.com/read/28993105/dual-trigger-of-final-oocyte-maturation-in-poor-ovarian-responders-undergoing-ivf-icsi-cycles
#13
Jie Zhang, Yun Wang, Xiaoyan Mao, Qiuju Chen, Qingqing Hong, Renfei Cai, Shaozhen Zhang, Yanping Kuang
Previous studies show that a dual trigger ovulation regimen significantly improves number and maturity of retrieved oocytes for normal ovarian responders or patients with history of low oocyte yield. The current retrospective cohort study investigated whether dual trigger of final oocyte maturation may benefit IVF outcomes for poor ovarian responders fulfilling the Bologna criteria. Undertaken between May 2014 and August 2016, the study involved 1350 patients undergoing 1389 IVF/intracytoplasmic sperm injection treatment cycles...
September 21, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28992536/how-many-receptor-like-kinases-are-required-to-operate-a-pollen-tube
#14
REVIEW
Jorge P Muschietti, Diego L Wengier
Successful fertilization depends on active molecular dialogues that the male gametophyte can establish with the pistil and the female gametophyte. Pollen grains and stigmas must recognize each other; pollen tubes need to identify the pistil tissues they will penetrate, follow positional cues to exit the transmitting tract and finally, locate the ovules. These molecular dialogues directly affect pollen tube growth rate and orientation. Receptor-like kinases (RLKs) are natural candidates for the perception and decoding of extracellular signals and their transduction to downstream cytoplasmic interactors...
October 6, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28992179/overexpression-of-the-class-d-mads-box-gene-sl-agl11-impacts-fleshy-tissue-differentiation-and-structure-in-tomato-fruits
#15
Baowen Huang, Jean-Marc Routaboul, Mingchun Liu, Wei Deng, Elie Maza, Isabelle Mila, Guojian Hu, Mohamed Zouine, Pierre Frasse, Julia T Vrebalov, James J Giovannoni, Zhengguo Li, Benoît van der Rest, Mondher Bouzayen
MADS-box transcription factors are key elements of the genetic networks controlling flower and fruit development. Among these, the class D clade gathers AGAMOUS-like genes which are involved in seed, ovule, and funiculus development. The tomato genome comprises two class D genes, Sl-AGL11 and Sl-MBP3, both displaying high expression levels in seeds and in central tissues of young fruits. The potential effects of Sl-AGL11 on fruit development were addressed through RNAi silencing and ectopic expression strategies...
September 14, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28989909/evaluation-of-progesterone-and-ovulation-stimulating-drugs-on-the-glandular-epithelium-and-angiogenesis-in-mice
#16
Bahman Rashidi, Mohammad Mardani, Mostafa Peyvandi Karizbodagh
BACKGROUND: Human endometrium is a dynamic tissue during the menstrual cycle can be influenced by ovarian hormones. The purpose of this study was to evaluate the endometrium angiogenesis under the influence of human menopausal gonadotropin and human chorionic gonadotropin (HMG and HCG) that stimulate ovulation and progesterone. MATERIALS AND METHODS: In this study, thirty adult female mice were randomly divided into three groups as: control, gonadotropin and gonadotropin + progesterone...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28987889/hormonal-therapeutic-strategy-on-the-induction-of-accessory-corpora-lutea-in-relation-to-follicle-size-and-on-the-increase-of-progesterone-in-sheep
#17
J Fernandez, M M Bruno-Galarraga, A T Soto, R L de la Sota, M I Cueto, I M Lacau, A E Gibbons
We determined the effect of GnRH or hCG treatment on day 4 post-time artificial insemination (FTAI) on the formation of accessory corpora lutea (acc-CL) and on the concentration of serum progesterone (P4) in sheep. Multiparous adult Merino ewes (n = 36) were synchronized for estrus using double injection of PGF2α agonist (125 μg Cloprostenol) with an interval of 14 days. At 53-56 h after the second PG application, FTAI was performed. On day 4 post FTAI, ewes were either treated with analogue of GnRH (4 μg buserelin; n = 12) or hCG (300 IU, hCG; n = 12) or saline solution (1 ml; Control; n = 12)...
September 23, 2017: Theriogenology
https://www.readbyqxmd.com/read/28987795/morphological-evaluation-of-day-8-embryos-developed-during-induced-aluteal-cycles-in-the-mare
#18
C A Leisinger, V Medina, M L Markle, D L Paccamonti, C R F Pinto
A novel in vivo model utilizing serial administrations of PGF2α to induce aluteal cycles in the mare was used to evaluate the effects of progesterone-deprivation on the morphology of in vivo preimplantation embryos. We hypothesized that equine embryos produced during induced aluteal cycles (AL) would be developmentally affected, characterized by earlier embryo stage at collection, smaller embryo diameter, and lower quality grade, compared with those collected on the same day post-ovulation from control cycles during diestrus (high progesterone; > 4 ng/mL)...
September 25, 2017: Theriogenology
https://www.readbyqxmd.com/read/28987588/characterization-of-luteal-dynamics-in-lactating-holstein-cows-for-32-days-after-synchronization-of-ovulation-and-timed-artificial-insemination
#19
A Ricci, P D Carvalho, M C Amundson, P M Fricke
Approximately 20 to 30% of cows diagnosed not pregnant 32 d after timed artificial insemination (TAI) lack a corpus luteum (CL), and cows submitted to a resynchronization protocol in the absence of a CL have about 10% fewer pregnancies per AI (P/AI) than cows with a CL. An understanding of luteal dynamics after synchronization of ovulation and TAI may help refine strategies for reinseminating cows failing to conceive. Lactating Holstein cows (n = 141) were synchronized for first TAI using a Double-Ovsynch protocol...
October 4, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28985546/ovulation-induction-and-controlled-ovarian-stimulation-using-letrozole-gonadotropin-combination-a-single-center-retrospective-cohort-study
#20
Sushila Arya, Sanja Kupesic-Plavsic, Zuber D Mulla, Alok K Dwivedi, Zeni Crisp, Jisha Jose, Luis S Noble
OBJECTIVE: To assess the effect of letrozole in combination with low dose gonadotropins for ovulation induction in anovulatory infertility from polycystic ovary syndrome (PCOS) and controlled ovarian stimulation for endometriosis, and unexplained infertility patients. STUDY DESIGN: Retrospective cohort study in a setting of private Reproductive Endocrinology and Infertility Clinic affiliated with the University. Three hundred couples (650 cycles) requiring OI/COS for PCOS (92 patients, 195 cycles), endometriosis (89 patients, 217 cycles), and unexplained infertility (119 patients, 238 cycles)...
September 23, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
keyword
keyword
44213
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"