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https://www.readbyqxmd.com/read/27925199/dopamine-dependent-effects-on-basal-and-glutamate-stimulated-network-dynamics-in-cultured-hippocampal-neurons
#1
Yan Li, Xin Chen, Rhonda Dzakpasu, Katherine Conant
Oscillatory activity occurs in cortical and hippocampal networks with specific frequency ranges thought to be critical to working memory, attention, differentiation of neuronal precursors, and memory trace replay. Synchronized activity within relatively large neuronal populations is influenced by firing and bursting frequency within individual cells, and the latter is modulated by changes in intrinsic membrane excitability and synaptic transmission. Published work suggests that dopamine (DA), a potent modulator of learning and memory, acts on dopamine receptor 1-like dopamine receptors (D1Rs) to influence the phosphorylation and trafficking of glutamate receptor subunits, along with long-term potentiation (LTP) of excitatory synaptic transmission in striatum and prefrontal cortex...
December 7, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27924433/effect-of-wave-current-interactions-on-sediment-resuspension-in-large-shallow-lake-taihu-china
#2
Yiping Li, Chunyan Tang, Jianwei Wang, Kumud Acharya, Wei Du, Xiaomeng Gao, Liancong Luo, Huiyun Li, Shujun Dai, Jepkirui Mercy, Zhongbo Yu, Baozhu Pan
The disturbance of the water-sediment interface by wind-driven currents and waves plays a critical role in sediment resuspension and internal nutrient release in large, shallow lakes. This study analyzed the effects of the interactions between wind-induced currents an1d waves on the driving mechanism of sediment resuspension in Lake Taihu, the third largest freshwater lake in China, using acoustic and optic techniques to collect long-term, high-frequency, synchronous in situ measurements of wind, currents, waves, and suspended solid concentrations (SSCs)...
December 6, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27924307/dendrites-and-pits-untangling-the-complex-behavior-of-lithium-metal-anodes-through-operando-video-microscopy
#3
Kevin N Wood, Eric Kazyak, Alexander F Chadwick, Kuan-Hung Chen, Ji-Guang Zhang, Katsuyo Thornton, Neil P Dasgupta
Enabling ultra-high energy density rechargeable Li batteries would have widespread impact on society. However the critical challenges of Li metal anodes (most notably cycle life and safety) remain unsolved. This is attributed to the evolution of Li metal morphology during cycling, which leads to dendrite growth and surface pitting. Herein, we present a comprehensive understanding of the voltage variations observed during Li metal cycling, which is directly correlated to morphology evolution through the use of operando video microscopy...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27924282/a-computationally-efficient-algorithm-for-fitting-ion-channel-parameters
#4
Zachary R Teed, Jonathan R Silva
Continuous time Markov models have been widely used to describe ion channel kinetics, providing explicit representation of channel states and transitions. Fitting models to experimental data remains a computationally demanding task largely due to the high cost of model evaluation. Here, we propose a method to efficiently optimize model parameters and structure. Voltage clamp channel protocols can be decomposed into a series of fixed steps of constant voltage resulting in a set of linear systems of differential equations...
2016: MethodsX
https://www.readbyqxmd.com/read/27923638/dance-and-music-share-gray-matter-structural-correlates
#5
Falisha J Karpati, Chiara Giacosa, Nicholas E V Foster, Virginia B Penhune, Krista L Hyde
Intensive practise of sensorimotor skills, such as music and dance, is associated with brain structural plasticity. While the neural correlates of music have been well-investigated, less is known about the neural correlates of dance. Additionally, the gray matter structural correlates of dance versus music training have not yet been directly compared. The objectives of the present study were to compare gray matter structure as measured by surface- and voxel-based morphometry between expert dancers, expert musicians and untrained controls, as well as to correlate gray matter structure with performance on dance- and music-related tasks...
December 3, 2016: Brain Research
https://www.readbyqxmd.com/read/27923593/diagnosis-and-treatment-of-in-transit-melanoma-metastases
#6
REVIEW
A Testori, S Ribero, V Bataille
In transit metastases (ITM) from extremity or trunk melanomas are subcutaneous or cutaneous lymphatic deposits of melanoma cells, distant from the primary site but not reaching the draining nodal basin. Superficial ITM metastases develop in 5-10% of melanoma patients and are thought to be caused by cells spreading along lymphatics; ITM appear biologically different from distant cutaneous metastases, these probably due to a haematogenous dissemination. The diagnosis is usually clinical and by patients, but patients need to be adequately educated in the recognition of this clinical situation...
October 27, 2016: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27923424/orexin-and-epilepsy-potential-role-of-rem-sleep
#7
Marcus C Ng
Interest in orexin receptor antagonism as a novel mechanism of action against seizures and epilepsy has increased in recent years. Loss of orexinergic activity is associated with REM sleep onset, and REM sleep is generally protective against seizures. This paper discusses the dynamic modulation of seizure threshold by orexin through a postulated "orexi-cortical" axis in which the specific type of orexinergic activity exquisitely regulates sleep-wake states to modify ascending subcortical influences on cortical synchronization with profound subsequent consequences on seizure threshold...
November 28, 2016: Sleep
https://www.readbyqxmd.com/read/27923192/regional-homogeneity-associated-with-overgeneral-autobiographical-memory-of-first-episode-treatment-naive-patients-with-major-depressive-disorder-in-the-orbitofrontal-cortex-a-resting-state-fmri-study
#8
Yansong Liu, Xudong Zhao, Zaohuo Cheng, Fuquan Zhang, Jun Chang, Haosen Wang, Rukui Xie, Zhiqiang Wang, Leiming Cao, Guoqiang Wang
BACKGROUND: Overgeneral autobiographical memory (OGM) is involved in the onset and maintenance of depression. Recent studies have shown correlations between OGM and alterations of some brain regions by using task-state functional magnetic resonance imaging (fMRI). However, the correlation between OGM and spontaneous brain activity in depression remains unclear. The purpose of this study was to determine whether patients with major depressive disorder (MDD) show abnormal regional homogeneity (ReHo) and, if so, whether the brain areas with abnormal ReHo are associated with OGM...
November 30, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/27923040/a-low-correlation-resting-state-of-the-striatum-during-cortical-avalanches-and-its-role-in-movement-suppression
#9
Andreas Klaus, Dietmar Plenz
During quiet resting behavior, involuntary movements are suppressed. Such movement control is attributed to cortico-basal ganglia loops, yet population dynamics within these loops during resting and their relation to involuntary movements are not well characterized. Here, we show by recording cortical and striatal ongoing population activity in awake rats during quiet resting that intrastriatal inhibition maintains a low-correlation striatal resting state in the presence of cortical neuronal avalanches. Involuntary movements arise from disturbed striatal resting activity through two different population dynamics...
December 2016: PLoS Biology
https://www.readbyqxmd.com/read/27922540/prognostic-value-of-quantitative-pet-ct-in-patients-with-a-nonsmall-cell-lung-cancer-and-another-primary-cancer
#10
Xuee Zhu, Chuanhong Liao, Bill C Penney, Feng Li, Mark K Ferguson, Cassie A Simon, Tianming Wu, Haiyan Liu, Yonglin Pu
OBJECTIVE: The staging and management of patients with newly diagnosed nonsmall cell lung cancer (NSCLC) in the setting of recently diagnosed other (metachronous or synchronous) primary cancer are challenging. This retrospective cohort study was carried out to test our hypothesis that baseline 2-deoxy-2-[F]fluoro-D-glucose (F-FDG) PET/CT parameters, including whole-body metabolic tumor volume (MTVWB), total lesion glycolysis (TLGWB), and maximum standardized uptake value (SUVmaxWB), are associated with the overall survival (OS) of such patients...
December 2, 2016: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/27922105/interplay-of-coupling-and-common-noise-at-the-transition-to-synchrony-in-oscillator-populations
#11
Anastasiya V Pimenova, Denis S Goldobin, Michael Rosenblum, Arkady Pikovsky
There are two ways to synchronize oscillators: by coupling and by common forcing, which can be pure noise. By virtue of the Ott-Antonsen ansatz for sine-coupled phase oscillators, we obtain analytically tractable equations for the case where both coupling and common noise are present. While noise always tends to synchronize the phase oscillators, the repulsive coupling can act against synchrony, and we focus on this nontrivial situation. For identical oscillators, the fully synchronous state remains stable for small repulsive coupling; moreover it is an absorbing state which always wins over the asynchronous regime...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921363/morphomechanics-and-developmental-constraints-in-the-evolution-of-ammonites-shell-form
#12
Alexander Erlich, Derek E Moulton, Alain Goriely, Regis Chirat
The idea that physical processes involved in biological development underlie morphogenetic rules and channel morphological evolution has been central to the rise of evolutionary developmental biology. Here, we explore this idea in the context of seashell morphogenesis. We show that a morphomechanical model predicts the effects of variations in shell shape on the ornamental pattern in ammonites, a now extinct group of cephalopods with external chambered shell. Our model shows that several seemingly unrelated characteristics of synchronous, ontogenetic, intraspecific, and evolutionary variations in ornamental patterns among various ammonite species may all be understood from the fact that the mechanical forces underlying the oscillatory behavior of the shell secreting system scale with the cross-sectional curvature of the shell aperture...
December 6, 2016: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/27921066/review-of-imaging-network-activities-in-developing-rodent-cerebral-cortex-in-vivo
#13
REVIEW
Heiko J Luhmann
The combination of voltage-sensitive dye imaging (VSDI) with multielectrode array (MEA) recordings in the rodent cerebral cortex in vivo allows the simultaneous analysis of large-scale network interactions and electrophysiological single-unit recordings. Using this approach, distinct patterns of spontaneous and sensory-evoked activity can be recorded in the primary somatosensory (S1) and motor cortex (M1) of newborn rats. Already at the day of birth, gamma oscillations and spindle bursts in the barrel cortex synchronize the activity of a local columnar ensemble, thereby generating an early topographic representation of the sensory periphery...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/27920648/synchronous-adenocarcinoma-of-the-colon-and-rectal-carcinoid
#14
Vamshidhar Vootla, Rafeeq Ahmed, Masooma Niazi, Bhavna Balar, Suresh Nayudu
Primary colonic adenocarcinoma and synchronous rectal carcinoids are rare tumors. Whenever a synchronous tumor with a nonmetastatic carcinoid component is encountered, its prognosis is determined by the associate malignancy. The discovery of an asymptomatic gastrointestinal carcinoid during the operative treatment of another malignancy will usually only require resection without additional treatment and will have little effect on the prognosis of the individual. This article reports a synchronous rectal carcinoid in a patient with hepatic flexure adenocarcinoma...
September 2016: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/27920487/synchronous-occurrence-of-a-hepatic-myelolipoma-and-two-hepatocellular-carcinomas
#15
Shao-Yan Xu, Hai-Yang Xie, Lin Zhou, Shu-Sen Zheng, Wei-Lin Wang
Myelolipoma is a rare tumor composed of fat and bone marrow components, most of which are located in the adrenal gland. Myelolipoma in the liver is extremely rare. To date, only 10 cases have been reported in the English-language medical literature. In one of these cases, the hepatic myelolipoma was found within a hepatocellular carcinoma (HCC). In the present study, we report the first case of the synchronous occurrence of hepatic myelolipoma and HCCs in different liver sections of one patient, a 26-year-old female who was admitted to our hospital because of a 4-d history of upper abdominal pain...
November 21, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27920039/systems-chronobiology-global-analysis-of-gene-regulation-in-a-24-hour-periodic-world
#16
Jérôme Mermet, Jake Yeung, Felix Naef
Mammals have evolved an internal timing system, the circadian clock, which synchronizes physiology and behavior to the daily light and dark cycles of the Earth. The master clock, located in the suprachiasmatic nucleus (SCN) of the brain, takes fluctuating light input from the retina and synchronizes other tissues to the same internal rhythm. The molecular clocks that drive these circadian rhythms are ticking in nearly all cells in the body. Efforts in systems chronobiology are now being directed at understanding, on a comprehensive scale, how the circadian clock controls different layers of gene regulation to provide robust timing cues at the cellular and tissue level...
December 5, 2016: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/27919803/germ-cell-proliferation-and-cluster-behavior-in-ovarioles-of-sialis-flavilatera-megaloptera-sialidae-during-larval-growth
#17
Ralph Rübsam, Jürgen Büning
Telotrophic meroistic insect ovaries are assigned to four different types. The Sialis type is found in Sialidae (Megaloptera), Raphidioptera and a coleopteran subgroup (Myxophaga: Hydroscaphidae). King and Büning (1985) proposed a hypothetical model for the development of this ovariole type, a detailed description of ovarian development in Sialis was missing so far. Using light and electron microscopy, we investigated developing ovaries of Sialis flavilatera starting in the 10(th) month of the biennial larval phase until adulthood...
December 2, 2016: Arthropod Structure & Development
https://www.readbyqxmd.com/read/27919266/arrest-at-the-diplotene-stage-of-meiotic-prophase-i-is-delayed-by-progesterone-but-is-not-required-for-primordial-follicle-formation-in-mice
#18
Sudipta Dutta, Deion M Burks, Melissa E Pepling
BACKGROUND: In mammalian females, reproductive capacity is determined by the size of the primordial follicle pool. During embryogenesis, oogonia divide mitotically but cytokinesis is incomplete so oogonia remain connected in germ cell cysts. Oogonia begin to enter meiosis at 13.5 days postcoitum in the mouse and over several days, oocytes progress through the stages of meiotic prophase I arresting in the diplotene stage. Concurrently, germ cell cysts break apart and individual oocytes become surrounded by granulosa cells forming primordial follicles...
December 5, 2016: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/27919117/noninvasive-neurally-adjusted-ventilatory-assist-in-premature-infants-postextubation
#19
Tarah T Colaizy, Gary J Kummet, Colleen M Kummet, Jonathan M Klein
Background Neurally adjusted ventilatory assist (NAVA) has distinct advantages when used invasively compared with conventional ventilation techniques. Evidence supporting the use of noninvasive NAVA is less robust, especially in the very low birth weight (VLBW) population. Objective To determine whether synchronized noninvasive ventilation via neurally adjusted ventilatory assist (NIV NAVA) supports ventilation postextubation in premature infants. Methods A retrospective analysis of a cohort of twenty-four former VLBW (<1...
December 5, 2016: American Journal of Perinatology
https://www.readbyqxmd.com/read/27918914/transformation-of-jaw-muscle-satellite-cells-to-cardiomyocytes
#20
Randall S Daughters, Susan A Keirstead, Jonathan M W Slack
In the embryo a population of progenitor cells known as the second heart field forms not just parts of the heart but also the jaw muscles of the head. Here we show that it is possible to take skeletal muscle satellite cells from jaw muscles of the adult mouse and to direct their differentiation to become heart muscle cells (cardiomyocytes). This is done by exposing the cells to extracellular factors similar to those which heart progenitors would experience during normal embryonic development. By contrast, cardiac differentiation does not occur at all from satellite cells isolated from trunk and limb muscles, which originate from the somites of the embryo...
December 2, 2016: Differentiation; Research in Biological Diversity
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