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https://www.readbyqxmd.com/read/28927240/temporal-dynamics-of-hippocampal-and-medial-prefrontal-cortex-interactions-during-the-delay-period-of-a-working-memory-guided-foraging-task
#1
Maxym Myroshnychenko, Jeremy K Seamans, Anthony G Phillips, Christopher C Lapish
Connections between the hippocampus (HC) and medial prefrontal cortex (mPFC) are critical for working memory; however, the precise contribution of this pathway is a matter of debate. One suggestion is that it may stabilize retrospective memories of recently encountered task-relevant information. Alternatively, it may be involved in encoding prospective memories, or the internal representation of future goals. To explore these possibilities, simultaneous extracellular recordings were made from mPFC and HC of rats performing the delayed spatial win-shift on a radial maze...
September 12, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28926941/why-ubiquitin-has-not-evolved
#2
Douglas C Allan, James C Phillips
Ubiquitin, discovered less than 50 years ago, tags thousands of diseased proteins for destruction. It is small (only 76 amino acids), and is found unchanged in mammals, birds, fish, and even worms, indicating that ubiquitin is perfect. Key features of its functionality are identified here using critical point thermodynamic scaling theory. These include synchronized pivots and hinges, a stabilizing central pivot, and Fano interference between first- and second-order elements of correlated long-range (allosteric) globular surface shape transitions...
September 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28926593/target-directed-motor-imagery-of-the-lower-limb-enhances-event-related-desynchronization
#3
Kosuke Kitahara, Yoshikatsu Hayashi, Shiro Yano, Toshiyuki Kondo
Event-related desynchronization/synchronization (ERD/S) is an electroencephalogram (EEG) feature widely used as control signals for Brain-Computer Interfaces (BCIs). Nevertheless, the underlying neural mechanisms and functions of ERD/S are largely unknown, thus investigating them is crucial to improve the reliability of ERD/S-based BCIs. This study aimed to identify Motor Imagery (MI) conditions that enhance ERD/S. We investigated following three questions: 1) whether target-directed MI affects ERD/S, 2) whether MI with sound imagery affects ERD/S, and 3) whether ERD/S has a body part dependency of MI...
2017: PloS One
https://www.readbyqxmd.com/read/28925798/laparoscopic-resections-of-colorectal-cancer-and-synchronous-liver-metastases-a-case-controlled-study
#4
Xiao Xu, Yulin Guo, Guijin Chen, Chen Li, Hongguang Wang, Guanglong Dong
PURPOSE: To investigate the efficacy and safety of laparoscopic simultaneous resections of colorectal cancer and synchronous colorectal liver metastases (SCRLM), relative to open surgery. METHODS: Between 1 January 2009 and 20 April 2014, 20 of 25 patients who underwent laparoscopic simultaneous colorectal cancer and SCRLM resections were matched with 20 of 29 patients who underwent an open approach, based on prognostic propensity scores. Perioperative results and survival outcomes were compared...
September 19, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/28924871/investigating-the-behavior-of-binding-properties-between-dissolved-organic-matter-dom-and-pb-ii-during-the-soil-sorption-process-using-parallel-factor-analysis-parafac-and-two-dimensional-correlation-spectroscopy-2d-cos
#5
Ying Zhang, Yifan Wang, Xinyuan Zhang, Ruizhen Li, Yukun Chen, Qingjuan Meng
Dissolved organic matter (DOM) is the most active component in an environmental system. It can influence the chemical and structural characteristics of soil. In this work, three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy, parallel factor analysis (PARAFAC), and two-dimensional correlation spectroscopy (2D-COS) integrated with synchronous fluorescence were used to explore the interaction between soil-derived DOM and Pb(II) during the soil sorption process. According to the data of batch sorption experiments, the adsorbing capacities of soil, soil + 5 mL DOM, and soil + 10 mL DOM were 16...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28924721/carcinoma-in-the-remnant-stomach-during-long-term-follow-up-after-distal-gastrectomy-for-gastric-cancer-analysis-of-cumulative-incidence-and-associated-risk-factors
#6
Takaaki Hanyu, Atsuhiro Wakai, Takashi Ishikawa, Hiroshi Ichikawa, Hitoshi Kameyama, Toshifumi Wakai
BACKGROUND: The number of patients with remnant gastric cancer following resection of gastric cancer may increase. The aims of this study were to investigate the development of remnant gastric cancer after distal gastrectomy for gastric cancer and to examine its cumulative incidence, clinicopathological characteristics, and risk factors. METHODS: We examined 437 patients with relapse-free survival for 5 years or more after distal gastrectomy with Billroth I reconstruction for gastric cancer performed between 1985 and 2005...
September 18, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28924567/rearrangeable-and-exchangeable-optical-module-with-system-on-chip-for-wearable-functional-near-infrared-spectroscopy-system
#7
Tsukasa Funane, Takashi Numata, Hiroki Sato, Shinsuke Hiraizumi, Yuichi Hasegawa, Hidenobu Kuwabara, Kiyoshi Hasegawa, Masashi Kiguchi
We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions...
January 2018: Neurophotonics
https://www.readbyqxmd.com/read/28924517/breast-cancer-metastases-to-the-gastrointestinal-tract-presenting-with-anemia-and-intra-abdominal-bleed
#8
Idrees Khan, Rehan Malik, Amina Khan, Salman Assad, Mehr Zahid, Muhammad Saad Sohail, Faizan Yasin, Ahmed H Qavi
Signet ring adenocarcinoma of the breast with synchronous metastasis to the gastrointestinal (GI) tract is a rare occurrence, typically presenting with abdominal pain, dyspepsia, or GI bleed. We report a case of metastatic breast cancer presenting with a complaint of anemia. A further diagnostic evaluation revealed generalized lymphadenopathy, nodular thickening of the urinary bladder wall, bone lesions, and enlarged pancreas. Biopsies from the lymph nodes, pancreatic biopsy, and bladder nodule all revealed a signet cell carcinoma...
July 6, 2017: Curēus
https://www.readbyqxmd.com/read/28923970/synchronous-timing-of-food-resources-triggers-bears-to-switch-from-salmon-to-berries
#9
Stephanie M Carlson
No abstract text is available yet for this article.
September 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28923929/exceptionally-tight-membrane-binding-may-explain-the-key-role-of-the-synaptotagmin-7-c2a-domain-in-asynchronous-neurotransmitter-release
#10
Rashmi Voleti, Diana R Tomchick, Thomas C Südhof, Josep Rizo
Synaptotagmins (Syts) act as Ca(2+) sensors in neurotransmitter release by virtue of Ca(2+)-binding to their two C2 domains, but their mechanisms of action remain unclear. Puzzlingly, Ca(2+)-binding to the C2B domain appears to dominate Syt1 function in synchronous release, whereas Ca(2+)-binding to the C2A domain mediates Syt7 function in asynchronous release. Here we show that crystal structures of the Syt7 C2A domain and C2AB region, and analyses of intrinsic Ca(2+)-binding to the Syt7 C2 domains using isothermal titration calorimetry, did not reveal major differences that could explain functional differentiation between Syt7 and Syt1...
September 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28923705/effect-of-gnrh-on-ovulatory-response-after-luteolysis-induced-by-two-low-doses-of-pgf2%C3%AE-in-lactating-dairy-cows
#11
Tsung-Ching Liu, Chen-Fei Chiang, Chia-Tang Ho, Jacky Peng-Wen Chan
This study investigated the effect of gonadotropin-releasing hormone (GnRH) on ovulatory response after complete luteolysis induced by two low doses of prostaglandin (PG)F2α in lactating dairy cows. Cows (n = 18) ranging between 45 and 65 days in milk were recruited for synchronization by a modified Ovsynch-48 protocol (GnRH-7 days-375 μg PGF2α-1 day-250 μg of PGF2α-1 day-GnRH) over a total of 23 estrous cycles. Synchronized cows (n = 16) were randomly assigned to GnRH and Saline groups in stage 1 of the experiment after 9-10 days of ovulation in synchronization...
September 9, 2017: Theriogenology
https://www.readbyqxmd.com/read/28923619/ten-year-follow-up-of-pharmacokinetics-guided-very-early-cyclosporine-minimization-synchronized-with-everolimus-initiation-in-de-novo-kidney-transplantation
#12
V Sumethkul, P Tankee, S Worawichawong, S Jirasiritham
BACKGROUND: Minimization of calcineurin inhibitor (CNI) from the 1st week after kidney transplantation (KT) may reduce the risk of CNI nephrotoxicity. METHODS: Ten de novo KT recipients who received full exposure cyclosporine (CsA) and prednisolone as initial therapy were enrolled. Initial CsA minimization was 50% and started at day 7 after KT. This was synchronized with everolimus (EVL) initiation. Target trough level of EVL was 3-8 ng/mL. Pharmacokinetics studies of CsA and EVL were studied at week 4...
October 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28923598/testicular-atrophy-and-reproductive-quiescence-in-photorefractory-and-scotosensitive-quail-involvement-of-hypothalamic-deep-brain-photoreceptors-and-gnrh-gnih-system
#13
Somanshu Banerjee, Chandra Mohini Chaturvedi
Birds time their daily and seasonal activities in synchronization with circadian and annual periodicities in the environment, which is mainly provided by changes in photoperiod/day length conditions. Photoperiod appears to act at the level of eye, pineal and encephalic/deep brain photoperception and thus entrain the hypothalamic clock as well as reproductive circuitry in different avian species. In this article our focus of study is to elucidate out the underlying molecular mechanism of modulation of the hypothalamic reproductive circuitry following the photoperception through the hypothalamic photoreceptor cells and the subsequent alteration in the reproductive responses in quail, kept under different simulated photoperiodic conditions...
September 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28923408/altered-functional-connectivity-in-mesial-temporal-lobe-epilepsy
#14
Hana Burianová, Nahla L Faizo, Marcus Gray, Julia Hocking, Graham Galloway, David Reutens
Growing evidence of altered functional connectivity suggests that mesial temporal lobe epilepsy (mTLE) alters not only hippocampal networks, but also a number of resting state networks. These highly coherent, yet functionally distinct brain circuits interact dynamically with each other in order to mediate consciousness, memory, and attention. However, little is currently known about the modulation of these networks by epileptiform activity, such as interictal spikes and seizures. The objective of the study was to use simultaneous EEG-fMRI to investigate functional connectivity in three resting state networks: default mode network (DMN), salience network (SN), and dorsal attentional network (DAN) in patients with mTLE compared to a healthy cohort, and in relation to the onset of interictal spikes and the period immediately prior to the spikes...
September 8, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28923080/prognostic-analysis-for-chinese-patients-with-stage-i-ovarian-endometrioid-carcinoma
#15
Yu Zhao, Shu Wang, Yi-Min Qu, Yu-Ting Ji, Keng Shen, Jing He Lang
BACKGROUND: This study aimed to identify the clinical and pathological characteristics and the possible prognostic factors for Chinese patients with early-stage ovarian endometrioid carcinoma. METHODS: The present study reviewed the medical records of patients who received initial treatment and a postoperative pathological diagnosis of ovarian endometrioid carcinoma at our center. In all, 78 patients had stage I ovarian endometrioid carcinoma. RESULTS: In this series, the 5-year overall survival rate and 5-year disease-free survival (DFS) rates of patients with stage I ovarian endometrioid carcinoma was 98...
September 18, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28922856/building-up-absence-seizures-in-the-somatosensory-cortex-from-network-to-cellular-epileptogenic-processes
#16
Guillaume Jarre, Tristan Altwegg-Boussac, Mark S Williams, Florian Studer, Mathilde Chipaux, Olivier David, Stéphane Charpier, Antoine Depaulis, Séverine Mahon, Isabelle Guillemain
The epileptogenic processes leading to recurrent seizures in Genetic Epilepsies are largely unknown. Using the Genetic Absence Epilepsy Rat from Strasbourg, we investigated in vivo the network and single neuron mechanisms responsible for the early emergence of epileptic activity. Local field potential recordings in the primary somatosensory cortex (SoCx), from the second post-natal week to adulthood, showed that immature cortical discharges progressively evolved into typical spike-and-wave discharges following a 3-step maturation process...
September 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28922137/finite-time-synchronization-of-networks-via-quantized-intermittent-pinning-control
#17
Chen Xu, Xinsong Yang, Jianquan Lu, Jianwen Feng, Fuad E Alsaadi, Tasawar Hayat
This technical correspondence considers finite-time synchronization of dynamical networks by designing aperiodically intermittent pinning controllers with logarithmic quantization. The control scheme can greatly reduce control cost and save both communication channels and bandwidth. By using multiple Lyapunov functions and convex combination techniques, sufficient conditions formulated by a set of linear matrix inequalities are derived to guarantee that all the node systems are synchronized with an isolated trajectory in a finite settling time...
September 18, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28922129/dissipativity-and-synchronization-of-generalized-bam-neural-networks-with-multivariate-discontinuous-activations
#18
Dongshu Wang, Lihong Huang, Longkun Tang
This paper is concerned with the dissipativity and synchronization problems of a class of delayed bidirectional associative memory (BAM) neural networks in which neuron activations are modeled by discontinuous bivariate functions. First, the concept of the Filippov solution is extended to functional differential equations with discontinuous right-hand sides and mixed delays via functional differential inclusions. The global dissipativity of the Filippov solution to the considered BAM neural networks is proven using generalized Halanay inequalities and matrix measure approaches...
September 14, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28921856/disruption-of-perineuronal-nets-increases-the-frequency-of-sharp-wave-ripple-events
#19
ZhiYong Sun, P Lorenzo Bozzelli, Adam Caccavano, Megan Allen, Jason Balmuth, Stefano Vicini, Jian-Young Wu, Katherine Conant
Hippocampal sharp wave ripples (SWRs) represent irregularly occurring synchronous neuronal population events that are observed during phases of rest and slow wave sleep. SWR activity that follows learning involves sequential replay of training-associated neuronal assemblies and is critical for systems level memory consolidation. SWRs are initiated by CA2 or CA3 pyramidal cells and require initial excitation of CA1 pyramidal cells as well as participation of parvalbumin (PV) expressing fast spiking (FS) inhibitory interneurons...
September 16, 2017: Hippocampus
https://www.readbyqxmd.com/read/28921823/encoding-seasonal-information-in-a-two-oscillator-model-of-the-multi-oscillator-circadian-clock
#20
Jihwan Myung, Scott D Pauls
The suprachiasmatic nucleus (SCN) is a collection of about 10,000 neurons, each of which functions as a circadian clock with slightly different periods and phases, that work in concert to form and maintain the master circadian clock for the organism. The diversity among neurons confers on the SCN the ability to robustly encode both the 24-hour light pattern as well as the seasonal time. Cluster synchronization brings the different neurons into line and reduces the large population to essentially two oscillators, coordinated by a macroscopic network motif of asymmetric repulsive-attractive coupling...
September 16, 2017: European Journal of Neuroscience
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