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https://www.readbyqxmd.com/read/28443722/reflections-on-o2-as-a-biosignature-in-exoplanetary-atmospheres
#1
Victoria S Meadows
Oxygenic photosynthesis is Earth's dominant metabolism, having evolved to harvest the largest expected energy source at the surface of most terrestrial habitable zone planets. Using CO2 and H2O-molecules that are expected to be abundant and widespread on habitable terrestrial planets-oxygenic photosynthesis is plausible as a significant planetary process with a global impact. Photosynthetic O2 has long been considered particularly robust as a sign of life on a habitable exoplanet, due to the lack of known "false positives"-geological or photochemical processes that could also produce large quantities of stable O2...
April 26, 2017: Astrobiology
https://www.readbyqxmd.com/read/28434559/what-do-george-clooney-and-sarah-jessica-parker-have-in-common-big-data
#2
Toshimasa J Clark, Rebecca J Mieloszyk, Puneet Bhargava
xxx.
May 2017: Current Problems in Diagnostic Radiology
https://www.readbyqxmd.com/read/28422534/in-situ-sampling-of-relative-dust-devil-particle-loads-and-their-vertical-grain-size-distributions
#3
Jan Raack, Dennis Reiss, Matthew R Balme, Kamal Taj-Eddine, Gian Gabriele Ori
During a field campaign in the Sahara Desert in southern Morocco, spring 2012, we sampled the vertical grain size distribution of two active dust devils that exhibited different dimensions and intensities. With these in situ samples of grains in the vortices, it was possible to derive detailed vertical grain size distributions and measurements of the lifted relative particle load. Measurements of the two dust devils show that the majority of all lifted particles were only lifted within the first meter (∼46...
April 19, 2017: Astrobiology
https://www.readbyqxmd.com/read/28415216/derivation-of-matrix-product-states-for-the-heisenberg-spin-chain-with-open-boundary-conditions
#4
Zhongtao Mei, C J Bolech
Using the algebraic Bethe Ansatz, we derive a matrix product representation of the exact Bethe-Ansatz states of the six-vertex Heisenberg chain (either XXX or XXZ and spin-1/2) with open boundary conditions. In this representation, the components of the Bethe eigenstates are expressed as traces of products of matrices that act on a tensor product of auxiliary spaces. As compared to the matrix product states of the same Heisenberg chain but with periodic boundary conditions, the dimension of the exact auxiliary matrices is enlarged as if the conserved number of spin-flips considered would have been doubled...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414078/the-influence-of-the-glutamatergic-system-on-cognition-in-schizophrenia-a-systematic-review
#5
REVIEW
Elizabeth H X Thomas, Kiymet Bozaoglu, Susan L Rossell, Caroline Gurvich
Thomas, E.H.X., K. Bozaoglu, S.L. Rossell and C. Gurvich. The Influence of the Glutamatergic System on Cognition in Schizophrenia: A Systematic Review. NEUROSCI BIOBEHAV REV 21(1) XXX-XXX, 2016. Previous literature showing the role of the glutamatergic system on cognition in schizophrenia has been inconclusive. 44 relevant pharmacological, candidate gene and neuroimaging studies were identified through systematic search following PRISMA guidelines. To be included, studies must have observed at least one objective measure of cognitive performance in patients with schizophrenia and either manipulated or measured the glutamatergic system...
April 13, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28411067/is-cigarette-and-alcohol-use-associated-with-high-risk-sexual-behaviors-among-youth-in-china
#6
Chao Guo, Xu Wen, Ning Li, Zhenjie Wang, Gong Chen, Xiaoying Zheng
BACKGROUND: Very few studies have explored the association between cigarette or alcohol use and high-risk sexual behaviors (HRSBs) among Chinese youth. AIM: To identify the associations between cigarette and/or alcohol use and HRSBs in unmarried youth 15 to 24 years old in China. METHODS: Data were obtained from a nationally representative survey of youth 15 to 24 years old in China. Population numbers, prevalences, and proportions were calculated where appropriate...
April 11, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28411066/the-actual-and-ideal-sexual-self-concept-in-the-context-of-genital-pain-using-implicit-and-explicit-measures
#7
Marieke Dewitte, Maarten De Schryver, Niclas Heider, Jan De Houwer
BACKGROUND: The experience of pain during sexual intercourse generates significant distress and sexual impairments, which is likely to affect sexual identity and become a threat to the sense of self. AIM: To explore the role of the concept of the sexual self in the context of genital pain by measuring different states of self (ie, actual vs ideal) at different levels of responding (ie, explicit vs implicit) and examine their associations with sexual, emotional, and pain-related variables...
April 11, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28406537/non-invasive-prenatal-screening-versus-prenatal-diagnosis-by-array-comparative-genomic-hybridization-a-comparative-retrospective-study
#8
Alexandros Sotiriadis, Ioannis Papoulidis, Elisavet Siomou, Elena Papageorgiou, Makarios Eleftheriades, Vasilios Papadopoulos, Maria Alexiou, Emmanouil Manolakos, Apostolos Athanasiadis
OBJECTIVE: To calculate the proportion of array comparative genomic hybridization (aCGH) pathogenic results, that would not be detectable by non-invasive prenatal screening (NIPS). METHODS: This is a comparative study using data from 2,779 fetuses, which underwent invasive prenatal diagnosis and the samples were analyzed using aCGH. The simulated NIPS assay would test for trisomies 21, 18, 13, monosomy X, 47,XXX, 47,XYY and 47,XXY. Indications for invasive testing were grouped into categories and the absolute, relative rates of pathogenic/likely pathogenic results of aCGH analysis that would not be detectable by NIPS, were calculated...
April 12, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28400207/the-safety-and-efficacy-of-growth-hormone-secretagogues
#9
REVIEW
John T Sigalos, Alexander W Pastuszak
INTRODUCTION: Growth hormone (GH) increases lean body mass, decreases fat mass, increases exercise tolerance and maximum oxygen uptake, enhances muscle strength, and improves linear growth. Long-term studies of GH administration offer conflicting results on its safety, which has led to strict Food and Drug Administration criteria for GH use. The potential drawbacks of exogenous GH use are believed to be due in part to impaired regulatory feedback. AIM: To review the literature on GH secretagogues (GHSs), which include GH-releasing peptides and the orally available small-molecule drug ibutamoren mesylate...
April 8, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28400085/distinguishing-failure-to-cure-from-complication-after-penile-prosthesis-implantation
#10
Miguel Pineda, Arthur L Burnett
BACKGROUND: A successful penile prosthesis implantation (PPI) surgery can be defined by outcomes beyond the absence of complications. AIM: To introduce the concept of failure to cure (FTC) in the context of PPI to more accurately gauge postoperative outcomes after PPI. METHODS: Consecutive patients from our sexual function registry who underwent PPI from January 2011 to December 2013 were analyzed. Demographics, previous treatment of erectile dysfunction, comorbidities, social history, postoperative problems (POPs), and surgical outcomes were tabulated...
April 8, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28395998/changes-in-the-effects-of-peyronie-s-disease-after-treatment-with-collagenase-clostridium-histolyticum-male-patients-and-their-female-partners
#11
Irwin Goldstein, L Dean Knoll, Larry I Lipshultz, Ted Smith, Gregory J Kaufman, Chris G McMahon
INTRODUCTION: Collagenase Clostridium histolyticum (CCH) intralesional injection was efficacious for the management of Peyronie's disease (PD) in the double-blinded, randomized, placebo-controlled Investigation for Maximal Peyronie's Reduction Efficacy and Safety Studies I and II (IMPRESS I and II). Little is known about the consequences of PD or treatment on the sexual partners of affected men. AIM: To assess the safety and efficacy of CCH treatment in men who received placebo in the IMPRESS I or II study and to evaluate the men's PD symptoms and partner bother as reported by female sexual partners...
April 5, 2017: Sexual Medicine
https://www.readbyqxmd.com/read/28395997/discontinuation-of-dapoxetine-treatment-in-patients-with-premature-ejaculation-a-2-year-prospective-observational-study
#12
Hyun Jun Park, Nam Cheol Park, Tae Nam Kim, Seung Ryong Baek, Kyung Min Lee, Sangmin Choe
INTRODUCTION: Although dapoxetine is the only oral pharmacologic agent approved for the treatment of premature ejaculation (PE) and is very effective, the discontinuation rate is high. AIM: To assess the discontinuation rate of patients with PE and the reasons for discontinuation in real-world practice. METHODS: In total, 182 consecutive patients were enrolled. Type of PE, self-estimated intravaginal ejaculation latency time, and medical history were evaluated in all patients who also completed the erectile function domain of the International Index of Erectile Function (IIEF)...
April 5, 2017: Sexual Medicine
https://www.readbyqxmd.com/read/28387189/enamel-pit-defects-and-taurodontism-in-a-patient-with-ring-chromosome-14-and-47-xxx
#13
Janice A Townsend, Letitia Lacour, Angela E Scheuerle
The purpose of this paper is to describe the clinical findings and management of a case involving a patient with co-occurring ring chromosome 14 syndrome and 47,XXX presenting with enamel pit defects and taurodontism. Ring chromosome 14 syndrome is an unusual condition with uncontrolled seizure disorder as its most significant finding; 47,XXX (trisomy X; triple X) is a more common condition and has characteristic physical and behavioral findings. Neither condition has been associated with enamel pit defects...
January 15, 2017: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/28372960/the-kiel-concept-of-long-term-administration-of-daily-low-dose-sildenafil-initiated-in-the-immediate-post-prostatectomy-period-evaluation-and-comparison-with-the-international-literature-on-penile-rehabilitation
#14
REVIEW
Daniar K Osmonov, Klaus P Jünemann, Andreas Bannowsky
INTRODUCTION: Radical prostatectomy (RP) is the most common definitive invasive treatment option for localized prostate cancer. Although the different surgical procedures-open RP, laparoscopic RP, and robot-assisted laparoscopic RP-do not differ significantly for the results of postoperative erectile dysfunction (ED) and continence, the fear of losing erectile function (EF) is often an important factor for preoperatively sexually active men when deciding for or against a procedure. AIM: To review the available literature on rehabilitation of EF after RP and to evaluate the value of the "Kiel concept" against different strategies of phosphodiesterase type 5 inhibitor (PDE5i) low-dose treatments...
March 31, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28372959/-cherchez-la-femme-modulation-of-estrogen-receptor-function-with-selective-modulators-clinical-implications-in-the-field-of-urology
#15
REVIEW
Sevann Helo, Blake Wynia, Andrew McCullough
INTRODUCTION: Selective estrogen receptor modulators (SERMs) have been used off-label in men for more than 50 years. SERMs exert their action on the estrogen receptor agonistically or antagonistically. A fundamental knowledge of the complex molecular action and physiology of SERMs is important in understanding their use and future directions of study in men. AIM: To review the basic science and mechanism of the action of estrogens, the estrogen receptor, and SERMs, and the existing clinical publications on the use of SERMs in men for infertility and hypogonadism with their strengths and weaknesses and to identify the need for future studies...
March 31, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28372939/c-tactile-mediated-erotic-touch-perception-relates-to-sexual-desire-and-performance-in-a-gender-specific-way
#16
Johanna Bendas, Janniko R Georgiadis, Gerhard Ritschel, Håkan Olausson, Kerstin Weidner, Ilona Croy
BACKGROUND: Unmyelinated low-threshold mechanoreceptors-the so-called C-tactile (CT) afferents-play a crucial role in the perception and conduction of caressing and pleasant touch sensations and significantly contribute to the concept of erotic touch perception. AIM: To investigate the relations between sexual desire and sexual performance and the perception of touch mediated by CT afferents. METHODS: Seventy healthy participants (28 men, 42 women; mean age ± SD = 24...
March 31, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28372938/biomarkers-of-inflammation-mediate-an-association-between-sexual-activity-and-quality-of-life-in-older-adulthood
#17
Mark S Allen
BACKGROUND: Inflammatory processes underlie biological mechanisms responsible for age-related disease and quality of life. Psychological stress can activate acute-phase reactants associated with inflammation, and sexual activity can assist in the management of stress. AIM: To test whether inflammatory biomarkers (C-reactive protein [CRP], fibrinogen, and white blood cell [WBC] count) would mediate an association between frequency of sexual activity and quality of life in older adulthood...
March 31, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28372937/effects-of-aversive-classical-conditioning-on-sexual-response-in-women-with-dyspareunia-and-sexually-functional-controls
#18
Stephanie Both, Marieke Brauer, Philomeen Weijenborg, Ellen Laan
INTRODUCTION: In dyspareunia-a somatically unexplained vulvovaginal pain associated with sexual intercourse-learned pain-related fear and inhibited sexual arousal are supposed to play a pivotal role. Based on research findings indicating that enhanced pain conditioning is involved in the etiology and maintenance of chronic pain, in the present study it was hypothesized that enhanced pain conditioning also might be involved in dyspareunia. AIM: To test whether learned associations between pain and sex negatively affect sexual response; whether women with dyspareunia show stronger aversive learning; and whether psychological distress, pain-related anxiety, vigilance, catastrophizing, and sexual excitation and inhibition were associated with conditioning effects...
March 31, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28372923/penoscrotal-strangulation-caused-by-a-steel-ring-a-case-report
#19
Jiqing Zhang, Xueming Wang, Zhulin Li, Junhui Zhang, Xiaodong Zhang, Nianzeng Xing
INTRODUCTION: Strangulation of the penis and scrotum by a constricting object has been rarely reported. AIM: To describe a man with penoscrotal strangulation caused by a steel ring and its successful removal. METHODS: A 28-year-old man presented to the emergency department with a 7-hour history of a steel ring lodged at the base of his penis and scrotum. Removal was accomplished with the assistance of fire brigade personnel who used their hydraulic cable cutter to shear the ring...
March 31, 2017: Sexual Medicine
https://www.readbyqxmd.com/read/28369492/night-monkey-hybrids-exhibit-de-novo-genomic-and-karyotypic-alterations-the-first-such-case-in-primates
#20
Hirohisa Hirai, Yuriko Hirai, Mayumi Morimoto, Akihisa Kaneko, Yoshiro Kamanaka, Akihiko Koga
Using molecular chromosomal analyses, we discovered night monkey hybrids produced in captivity from matings between a female Aotus azarae boliviensis (2n = 50) and a male Aotus lemurinus griseimembra (2n = 53). The parents produced seven offspring in total, including one male and six females-a pattern consistent with Haldane's rule. Chromosomal studies were conducted on four of the hybrid offspring. Two of them showed relatively "simple" mixture karyotypes, including different chromosome numbers (2n = 51, 52), which were formed because of a heteromorphic autosome pair in the father (n = 26, 27)...
April 1, 2017: Genome Biology and Evolution
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