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https://www.readbyqxmd.com/read/29222679/-objective-audiometry-and-clinical-application
#1
M Cebulla, D Ehrmann-Müller, W Shehata-Dieler
Subjective and objective hearing tests are used for evaluation of hearing impairments. Objective methods include impedance measurement with tympanometry and stapedius reflex measurement, otoacoustic emissions (OAE), and auditory evoked potentials (AEP). Combined with statistical analysis, the introduction of auditory steady state responses (ASSR) has enabled objective hearing tests in newborn hearing screening and automated hearing threshold assessment. The type and degree of hearing loss can be determined using the abovementioned methods...
December 8, 2017: HNO
https://www.readbyqxmd.com/read/29222513/biotrophy-necrotrophy-switch-in-pathogen-evoke-differential-response-in-resistant-and-susceptible-sesame-involving-multiple-signaling-pathways-at-different-phases
#2
Supriyo Chowdhury, Arpita Basu, Surekha Kundu
Infection stages of charcoal rot fungus Macrophomina phaseolina in sesame revealed for the first time a transition from biotrophy via BNS (biotrophy-to-necrotrophy switch) to necrotrophy as confirmed by transcriptional studies. Microscopy using normal and GFP-expressing pathogen showed typical constricted thick intercellular bitrophic hyphae which gave rise to thin intracellular necrotrophic hyphae during BNS and this stage was delayed in a resistant host. Results also show that as the pathogen switched its strategy of infection, the host tailored its defense strategy to meet the changing situation...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29220539/significance-and-mechanism-of-androgen-receptor-ar-overexpression-and-ar-mtor-crosstalk-in-hepatocellular-carcinoma
#3
Hong Zhang, Xiaoxing Li, Yang Yang, Yanjie Zhang, Hui-Yun Wang, X F Steven Zheng
Hepatocellular carcinoma (HCC) is a male-dominant cancer and androgen receptor (AR) has been linked to the pathogenesis of HCC. However, AR expression and its precise role in HCC remain controversial. Moreover, previous anti-androgen and -AR clinical trials in HCC failed to demonstrate clinical benefits. In this study, we found that AR is overexpressed in the nucleus of approximately 37% HCC tumors, which is significantly associated with advanced disease stage and poor survival. AR overexpression in HCC cells markedly alters AR-dependent transcriptome, stimulates oncogenic growth and determines therapeutic response to enzalutamide, a second generation of AR antagonist...
December 8, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29220524/brain-responses-to-cigarette-related-and-emotional-images-in-smokers-during-smoking-cessation-no-effect-of-varenicline-or-bupropion-on-the-late-positive-potential
#4
Francesco Versace, Elise M Stevens, Jason D Robinson, Yong Cui, Menton M Deweese, Jeffrey M Engelmann, Charles E Green, Maher Karam-Hage, Cho Y Lam, Jennifer A Minnix, David W Wetter, Paul M Cinciripini
Introduction: Varenicline and bupropion are two effective smoking cessation pharmacotherapies. Researchers have hypothesized that they might be effective, in part, because they reduce cue reactivity and cue-induced cravings. Here, we used event-related potentials (ERPs) to directly measure brain responses to cigarette-related and other motivationally relevant images during a pharmacologically aided quit attempt. Methods: Smokers involved in a 12-week placebo-controlled double-blind clinical trial of smoking cessation medications (varenicline, bupropion, placebo) took part in the study...
December 6, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/29220361/pre-stimulus-pupil-dilation-and-the-preparatory-control-of-attention
#5
Jessica L Irons, Minjeong Jeon, Andrew B Leber
Task preparation involves multiple component processes, including a general evaluative process that signals the need for adjustments in control, and the engagement of task-specific control settings. Here we examined the dynamics of these different mechanisms in preparing the attentional control system for visual search. We explored preparatory activity using pupil dilation, a well-established measure of task demands and effortful processing. In an initial exploratory experiment, participants were cued at the start of each trial to search for either a salient color singleton target (an easy search task) or a low-salience shape singleton target (a difficult search task)...
2017: PloS One
https://www.readbyqxmd.com/read/29220192/fluidic-microactuation-of-flexible-electrodes-for-neural-recording
#6
Flavia Vitale, Daniel Vercosa, Alexander V Rodriguez, Sushma Sri Pamulapati, Frederik Seibt, Eric Lewis, Jiaxi Stephen Yan, Krishna Badhiwala, Mohammed Adnan, Gianni Royer-Carfagni, Michael Beierlein, Caleb Kemere, Matteo Pasquali, Jacob Robinson
Soft and conductive nanomaterials like carbon nanotubes, graphene, and nanowire scaffolds have expanded the family of ultra-flexible microelectrodes that can bend and flex with the natural movement of the brain, reduce the inflammatory response and improve the stability of long-term neural recordings. However, current methods to implant these highly flexible electrodes rely on temporary stiffening agents that temporarily increase the electrode size and stiffness thus aggravating neural damage during implantation, which can lead to cell loss and glial activation that persists even after the stiffening agents are removed or dissolve...
December 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/29219063/an-insight-on-the-pathogenesis-and-treatment-of-systemic-lupus-erythematosus
#7
Murtaza Ali, Chelapram K Firoz, Nasimudeen R Jabir, Mohd Rehan, Mohd Shahnawaz Khan, Shams Tabrez
BACKGROUND AND OBJECTIVE: Systemic lupus erythematosus (SLE) is a diverse autoimmune disorder, evoked in response to self-immune system that leads to immune complex depositions and organ damage. The exact mechanism of SLE pathogenesis is still unclear but certain genetic and environmental factors have been suggested in the literature that could influence its pathogenesis. The modulation in B- and T- cell responses and genetic variations could lead to abnormal lymphocyte functions and the production of antibodies against the indigenous proteins and the immune complex depositions...
December 7, 2017: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/29218601/regulation-of-myelopoiesis-by-proinflammatory-cytokines-in-infectious-diseases
#8
REVIEW
Yukino Chiba, Izuru Mizoguchi, Hideaki Hasegawa, Mio Ohashi, Naoko Orii, Taro Nagai, Miyaka Sugahara, Yasunori Miyamoto, Mingli Xu, Toshiyuki Owaki, Takayuki Yoshimoto
Hematopoiesis is hierarchically orchestrated by a very small population of hematopoietic stem cells (HSCs) that reside in the bone-marrow niche and are tightly regulated to maintain homeostatic blood production. HSCs are predominantly quiescent, but they enter the cell cycle in response to inflammatory signals evoked by severe systemic infection or injury. Thus, hematopoietic stem and progenitor cells (HSPCs) can be activated by pathogen recognition receptors and proinflammatory cytokines to induce emergency myelopoiesis during infection...
December 7, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29218415/timing-of-cortical-activation-during-spontaneous-swallowing
#9
Erin Kamarunas, Rachel Mulheren, Katie Palmore, Christy Ludlow
Saliva accumulation in the oropharynx generates an automatic pattern of swallowing in the brainstem in animals. Previous fMRI studies have found that spontaneous saliva and water swallows in humans evoked activation following swallow onset in both precentral motor and postcentral somatosensory cortical regions. Using event-related averaging of continuous functional near infrared spectroscopy (fNIRS), we examined cortical hemodynamic responses (HDR) from 5 s before to 35 s after spontaneous reflexive saliva swallow onset in the lateral postcentral somatosensory and precentral motor regions in both hemispheres in healthy volunteers...
December 7, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29217689/dopamine-dependent-sensitization-of-rod-bipolar-cells-by-gaba-is-conveyed-through-wide-field-amacrine-cells
#10
Amanda M Travis, Stephanie J Heflin, Arlene A Hirano, Nicholas C Brecha, Vadim Y Arshavsky
Vertebrate retina has the remarkable ability to support visual function under conditions of limited illumination, including processing signals evoked by single photons. Dim light vision is regulated by several adaptive mechanisms. The mechanism explored in this study is responsible for increasing the light sensitivity and operational range of rod bipolar cells, the retinal neurons operating immediately downstream of rod photoreceptors. This sensitization is achieved through the sustained dopamine-dependent GABA release from other retinal neurons...
December 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29216451/mechanosensory-based-phase-coding-of-odor-identity-in-the-olfactory-bulb
#11
Ryo Iwata, Hiroshi Kiyonari, Takeshi Imai
Mitral and tufted (M/T) cells in the olfactory bulb produce rich temporal patterns of activity in response to different odors. However, it remains unknown how these temporal patterns are generated and how they are utilized in olfaction. Here we show that temporal patterning effectively discriminates between the two sensory modalities detected by olfactory sensory neurons (OSNs): odor and airflow-driven mechanical signals. Sniff-induced mechanosensation generates glomerulus-specific oscillatory activity in M/T cells, whose phase was invariant across airflow speed...
December 6, 2017: Neuron
https://www.readbyqxmd.com/read/29215024/identification-of-srna-mediated-responses-to-nutrient-depletion-in-burkholderia-pseudomallei
#12
Hirzahida Mohd-Padil, Nadzirah Damiri, Suhaila Sulaiman, Shiao-Fei Chai, Sheila Nathan, Mohd Firdaus-Raih
The Burkholderia genus includes many species that are known to survive in diverse environmental conditions including low nutrient environments. One species, Burkholderia pseudomallei is a versatile pathogen that can survive in a wide range of hosts and environmental conditions. In this study, we investigated how a nutrient depleted growth environment evokes sRNA mediated responses by B. pseudomallei. Computationally predicted B. pseudomallei D286 sRNAs were mapped to RNA-sequencing data for cultures grown under two conditions: (1) BHIB as a nutrient rich media reference environment and (2) M9 media as a nutrient depleted stress environment...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29213104/musical-imagery-involves-wernicke-s-area-in-bilateral-and-anti-correlated-network-interactions-in-musicians
#13
Yizhen Zhang, Gang Chen, Haiguang Wen, Kun-Han Lu, Zhongming Liu
Musical imagery is the human experience of imagining music without actually hearing it. The neural basis of this mental ability is unclear, especially for musicians capable of engaging in accurate and vivid musical imagery. Here, we created a visualization of an 8-minute symphony as a silent movie and used it as real-time cue for musicians to continuously imagine the music for repeated and synchronized sessions during functional magnetic resonance imaging (fMRI). The activations and networks evoked by musical imagery were compared with those elicited by the subjects directly listening to the same music...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29212923/response-inhibition-activates-distinct-motor-cortical-inhibitory-processes
#14
John Cirillo, Matthew J Cowie, Hayley J MacDonald, Winston D Byblow
We routinely cancel pre-planned movements that are no longer required. If stopping is forewarned, proactive processes are engaged to selectively decrease motor cortex excitability. However, without advance information there is a non-selective reduction in motor cortical excitability. Here we examine modulation of human primary motor cortex inhibitory networks during response inhibition tasks with informative and uninformative cues using paired-pulse transcranial magnetic stimulation. Long- and short-interval intracortical inhibition (LICI and SICI), indicative of GABAB- and GABAA-receptor mediated inhibition respectively, were examined from motor evoked potentials obtained in task-relevant and task-irrelevant hand muscles when response inhibition was preceded by informative and uninformative cues...
December 6, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29212780/excitatory-gabaergic-action-and-increased-vasopressin-synthesis-in-hypothalamic-magnocellular-neurosecretory-cells-underlie-the-high-plasma-level-of-vasopressin-in-diabetic-rat
#15
Young-Beom Kim, Woong Bin Kim, Won Woo Jung, Xiangyan Jin, Yoon Sik Kim, Byoungjae Kim, Hee Chul Han, Gene D Block, Christopher S Colwell, Yang In Kim
Diabetes mellitus (DM) is associated with increased plasma levels of arginine-vasopressin (AVP) which may aggravate hyperglycemia and nephropathy. However, the mechanisms by which DM may cause the increased AVP levels are not known. Electrophysiological recordings in the supraoptic nucleus (SON) slices from streptozotocin-induced DM model (STZ) rats and vehicle-treated control rats revealed that GABA functions generally as an excitatory neurotransmitter in the AVP neurons of STZ rats, whereas it evoked usually inhibitory responses in the cells of control animals...
December 6, 2017: Diabetes
https://www.readbyqxmd.com/read/29211684/independent-component-analysis-for-cochlear-implant-artifacts-attenuation-from-electrically-evoked-auditory-steady-state-response-measurements
#16
Hanne Deprez, Robin Gransier, Michael Hofmann, Astrid van Wieringen, Jan Wouters, Marc Moonen
OBJECTIVE: Electrically evoked auditory steady-state responses (EASSRs) are potentially useful for objective cochlear implant (CI) fitting and follow-up of the auditory maturation in infants and children with a CI. EASSRs are recorded in the electro-encephalogram (EEG) in response to electrical stimulation with continuous pulse trains, and are distorted by significant CI artifacts related to this electrical stimulation. The aim of this study is to evaluate a CI artifacts attenuation method based on independent component analysis (ICA) for three EASSR datasets...
December 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29211653/exploring-the-organization-of-semantic-memory-through-unsupervised-analysis-of-event-related-potentials
#17
Marijn van Vliet, Marc M Van Hulle, Riitta Salmelin
Modern multivariate methods have enabled the application of unsupervised techniques to analyze neurophysiological data without strict adherence to predefined experimental conditions. We demonstrate a multivariate method that leverages priming effects on the evoked potential to perform hierarchical clustering on a set of word stimuli. The current study focuses on the semantic relationships that play a key role in the organization of our mental lexicon of words and concepts. The N400 component of the event-related potential is considered a reliable neurophysiological response that is indicative of whether accessing one concept facilitates subsequent access to another (i...
December 6, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29211339/%C3%AE-3-adrenoceptor-agonists-inhibit-carbachol-evoked-ca2-oscillations-in-murine-detrusor-myocytes
#18
Caoimhin S Griffin, Eamonn Bradley, Mark A Hollywood, Noel G McHale, Keith D Thornbury, Gerard P Sergeant
OBJECTIVE: To test if carbachol-evoked Ca2+ oscillations in freshly isolated murine detrusor myocytes were affected by β3-adrenoceptor modulators. MATERIAL & METHODS: Isometric tension recordings were made from strips of murine detrusor and intracellular Ca2+ measurements were made from isolated detrusor myocytes using confocal microscopy. Transcriptional expression of β-AR sub-types in detrusor strips and isolated detrusor myocytes was assessed using RT-PCR and real-time quantitative PCR...
December 6, 2017: BJU International
https://www.readbyqxmd.com/read/29210020/effects-of-visual-and-cognitive-interference-on-joint-contributions-in-perturbed-standing-a-temporal-and-spectral-analysis
#19
Mohammed N Ashtiani, Mahmood-Reza Azghani
Postural balance requires using joint strategies which may be changed from normal conditions by interfering with the sensory information. The goal of the present study was to quantitatively evaluate the role of the joint mechanisms during perturbed stance. Visual and cognitive interference was imposed to sixteen healthy young males under rotational toes-down or up perturbations. Power spectral analysis was employed to distinguish the joint contribution and their in- or out-phase co-works. Results showed that addition of cognitive loads reduce the stability by increasing the center of mass (CoM) power to three times greater...
December 5, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29209365/immune-and-inflammatory-responses-of-the-intestinal-mucosa-following-extended-liver-radiofrequency-ablation
#20
Petros Ypsilantis, Maria Lambropoulou, Antonios Evagellou, Nikolaos Papadopoulos, Constantinos Simopoulos
Background and Aim: Extended liver radiofrequency ablation (RFA) has been shown to disrupt gut barrier integrity with subsequent bacterial translocation. The aim of the present project was to study the immune and inflammatory responses of the intestinal mucosa after extended RFA of the liver. Methods: Twelve Wistar rats were either subjected to RFA of the left lateral hepatic lobe (approximately 30% of the liver mass) after midline laparotomy (group RFA, n = 6) or sham operation (group Sham, n = 6)...
2017: Gastroenterology Research and Practice
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