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https://www.readbyqxmd.com/read/28432953/new-and-practical-mathematical-model-of-membrane-fouling-in-an-aerobic-submerged-membrane-bioreactor
#1
Mst Fazana Rahman Zuthi, Wenshan Guo, Huu Hao Ngo, Duc Long Nghiem, Faisal I Hai, Siqing Xia, Jianxin Li, Jixiang Li, Yi Liu
This study aimed to develop a practical semi-empirical mathematical model of membrane fouling that accounts for cake formation on the membrane and its pore blocking as the major processes of membrane fouling. In the developed model, the concentration of mixed liquor suspended solid is used as a lumped parameter to describe the formation of cake layer including the biofilm. The new model considers the combined effect of aeration and backwash on the foulants' detachment from the membrane. New exponential coefficients are also included in the model to describe the exponential increase of transmembrane pressure that typically occurs after the initial stage of an MBR operation...
April 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432538/superoxide-generated-in-the-chloroplast-stroma-causes-photoinhibition-of-photosystem-i-in-the-shade-establishing-tree-species-psychotria-henryi
#2
Wei Huang, Ying-Jie Yang, Jiao-Lin Zhang, Hong Hu, Shi-Bao Zhang
Our previous studies indicated that high light induced significant photoinhibition of photosystem I (PSI) in the shade-establishing tree species Psychotria henryi. However, the underlying mechanism has not been fully clarified. In the present study, in order to investigate the mechanism of PSI photoinhibition in P. henryi, we treated detached leaves with constant high light in the presence of methyl viologen (MV) or a soluble α-tocopherol analog, 2,2,5,7,8-pentamethyl-6-chromanol (PMC). We found that MV significantly depressed photochemical quantum yields in PSI and PSII when compared to PMC...
April 21, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28432165/intravitreal-cysticercosis-with-full-thickness-macular-hole-management-outcome-and-intraoperative-optical-coherence-tomography-features
#3
Karthikeya R, Raghav Dinesh Ravani, Prateek Kakkar, Atul Kumar
Ocular cysticercosis is a serious condition with a potential for complete vision loss if left untreated. Intravitreal cysticercosis is the most common ocular form of cysticercosis and is associated with retinal detachment, retinal traction, subretinal scarring and vitritis. To the best of our knowledge, there is no report of the occurrence of a live intravitreal cysticercosis with a full thickness macular hole (FTMH) in the literature. We here report a case of live intravitreal cysticercosis with a FTMH along with its management and intraoperative optical coherence tomography features of the live cysticercus...
April 21, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28430324/negative-staining-of-the-vitreous-with-the-use-of-vital-dyes
#4
Cesare Mariotti, Michele Nicolai, Simone Donati, Michele Reibaldi
PURPOSE: The vitreous cortex, epiretinal membrane (ERM), and inner limiting membrane (ILM) are transparent tissues and are thus difficult to visualize. Staining these structures can increase the efficiency of a nontraumatic removal. METHODS: The surgeon performs a partial core vitrectomy and induces a posterior vitreous detachment. The vital dye is then injected into the retrohyaloid space in balanced salt solution (BSS). The dyes used are TWIN (Alchimia srl, Padova, Italy), MembraneBlue-Dual (DORC International, Zuidland, the Netherlands), and Doubledyne (Alfa Intes, Casoria, Italy)...
April 13, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28428970/changes-in-anterior-segment-parameters-following-pars-plana-vitrectomy-measured-by-ultrasound-biomicroscopy-ubm
#5
Zahra Ghomi, Fariba Ghassemi
Despite being a posterior segment ocular surgery, pars plana vitrectomy (PPV) may also affect anterior segment parameters. We aimed to investigate anterior segment alterations following PPV using ultrasound biomicroscopy (UBM) to visualize the structural anatomy of the eye. In this study, we enrolled phakic patients undergoing PPV (as the sole procedure). The anterior chamber depth, crystalline lens anterior-posterior (AP) diameter, anterior chamber angle, ciliary body dimensions, and integrity of the ciliary zonules and posterior capsule were assessed using UBM before and at least 3 months after PPV...
2017: Medical Hypothesis, Discovery and Innovation in Ophthalmology
https://www.readbyqxmd.com/read/28427572/a-search-for-mixotrophy-and-mucus-trap-production-in-alexandrium-spp-and-the-dynamics-of-mucus-trap-formation-in-alexandrium-pseudogonyaulax
#6
Hannah E Blossom, Tine Dencker Bædkel, Urban Tillmann, Per Juel Hansen
Recently, a hitherto unknown feeding strategy, the toxic mucus trap, was discovered in the dinoflagellate Alexandrium pseudogonyaulax. In this study, over 40 strains of 8 different Alexandrium species (A. ostenfeldii, A. tamarense, A. catenella, A. taylorii, A. margalefii, A. hiranoi, A. insuetum and A. pseudogonyaulax) were screened for their ability to ingest prey and/or to form mucus traps. The mucus trap feeding strategy, where a mucus trap is towed by the longitudinal flagellum remains unique to A. pseudogonyaulax...
April 2017: Harmful Algae
https://www.readbyqxmd.com/read/28427081/choroidal-thickness-and-microperimetry-sensitivity-in-age-related-macular-degeneration
#7
Geoffrey K Broadhead, Thomas Hong, Peter McCluskey, John R Grigg, Timothy E Schlub, Andrew A Chang
PURPOSE: To assess choroidal thickness (CT) and its relationship to retinal sensitivity in mild/moderate age-related macular degeneration (AMD). METHODS: Seventy-two eyes of 51 participants with mild/moderate AMD and 36 eyes of 18 age-matched normal participants were prospectively recruited to undergo enhanced-depth imaging optical coherence tomography (EDI-OCT) imaging and microperimetry (MP) functional assessment. OCT-measured CT and retinal thickness (RT) were matched with MP sensitivity at 13 retinal loci, and correlations were analysed...
April 21, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/28427073/surgical-management-and-techniques
#8
Marco Codenotti, Lorenzo Iuliano, Gisella Maestranzi
Technical advancements have substantially extended the indications for surgery in diabetic retinopathy (DR) during the last 40 years, from the traditional indications including non-clearing vitreous hemorrhage, traction retinal detachment (RD), and traction-rhegmatogenous RD, to epiretinal membrane (ERM), vitreomacular traction, diffuse macular edema, neovascular glaucoma, and anterior hyaloid fibrovascular proliferation. The goals of vitreoretinal surgery in DR are multiple: clearing media opacities, release of traction (anteroposterior and/or tangential), segmentation and/or removal of traction bands, peeling of ERMs, hemostasis, laser photocoagulation, and tamponade of retinal breaks with gas or silicone oil...
2017: Developments in Ophthalmology
https://www.readbyqxmd.com/read/28427062/emerging-issues-for-optical-coherence-tomography
#9
Luisa Pierro, Alessandro Rabiolo
Almost 25 years after its introduction, optical coherence tomography (OCT) is still a crucial test in the evaluation of patients affected by diabetic retinopathy. In this chapter, the authors provide an extensive overview of the posterior segment pathological changes induced by diabetes, characterized using OCT. OCT plays a key role in diabetic macular edema (DME) as it assesses related retinal changes both in a qualitative (i.e., DME pattern, presence and aspects of cysts, fluid localization, integrity, and reflectivity of retinal layers) and quantitative (i...
2017: Developments in Ophthalmology
https://www.readbyqxmd.com/read/28426628/ocular-hypertension-and-glaucoma-following-vitrectomy-a-systematic-review
#10
Alba Miele, Andrea Govetto, Carlo Fumagalli, Simone Donati, Ilaria Biagini, Claudio Azzolini, Stanislao Rizzo, Gianni Virgili
PURPOSE: Pars plana vitrectomy has been reported to increase the risk of ocular hypertension and open-angle glaucoma. The authors conducted a systematic review of randomized and nonrandomized studies to compare the incidence of open-angle glaucoma and ocular hypertension in vitrectomized versus nonvitrectomized eyes. METHODS: A literature search was performed using MEDLINE and EMBASE until August 2016. Data on ocular hypertension and open-angle glaucoma incidence and mean intraocular pressure after at least 1 year were pooled using random-effects metaanalysis models...
April 19, 2017: Retina
https://www.readbyqxmd.com/read/28426623/intravitreal-dexamethasone-implantation-in-patients-with-different-morphological-diabetic-macular-edema-having-insufficient-response-to-ranibizumab
#11
Havva Kaldırım, Serpil Yazgan, Kursat Atalay, Ceren Gurez, Fatma Savur
PURPOSE: To evaluate the effectiveness of a single intravitreal injection of dexamethasone implant in resistant diabetic macular edema that have different morphological types. METHODS: In this retrospective study, 31 patients (35 eyes) with persistent diabetic macular edema, who underwent a single injection of dexamethasone implant, were evaluated. Diabetic macular edema was classified into three types: diffuse retinal thickening (n = 10), cystoid macular edema (n = 13), and serous retinal detachment (n = 12)...
April 19, 2017: Retina
https://www.readbyqxmd.com/read/28425969/the-pharmacological-effects-of-lutein-and-zeaxanthin-on-visual-disorders-and-cognition-diseases
#12
REVIEW
Yu-Ping Jia, Lei Sun, He-Shui Yu, Li-Peng Liang, Wei Li, Hui Ding, Xin-Bo Song, Li-Juan Zhang
Lutein (L) and zeaxanthin (Z) are dietary carotenoids derived from dark green leafy vegetables, orange and yellow fruits that form the macular pigment of the human eyes. It was hypothesized that they protect against visual disorders and cognition diseases, such as age-related macular degeneration (AMD), age-related cataract (ARC), cognition diseases, ischemic/hypoxia induced retinopathy, light damage of the retina, retinitis pigmentosa, retinal detachment, uveitis and diabetic retinopathy. The mechanism by which they are involved in the prevention of eye diseases may be due their physical blue light filtration properties and local antioxidant activity...
April 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28425538/uv-induced-hydrogen-atom-transfer-and-hydrogen-atom-detachment-in-monomeric-7-azaindole-isolated-in-ar-and-n-h2-matrices
#13
Maciej J Nowak, Igor Reva, Hanna Rostkowska, Leszek Lapinski
Photochemical transformations were investigated for monomers of 7-azaindole isolated in low-temperature Ar and normal-H2 (n-H2) matrices. The most stable N1H tautomer was the only form of the compound populated in Ar and n-H2 matrices before any irradiation. Upon exposure of Ar matrices to UV (λ > 270 nm) light, two higher-energy tautomers N7H and C3H were photoproduced. Additionally, spectral signatures of the photogenerated 7-azaindolyl radical were also found. All of these photoproducts were experimentally observed for the first time...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28424735/tongue-necrosis-secondary-to-giant-cell-arteritis-a-case-report-and-literature-review
#14
Rafael Alex Barbosa de Siqueira Sobrinho, Karolina Cayres Alvino de Lima, Helena Carvalho Moura, Mônica Modesto Araújo, Christyanne Maria Rodrigues Barreto de Assis, Pedro Alves da Cruz Gouveia
Giant cell arteritis is a form of vasculitis involving the medium- and large-sized arteries that chiefly affects older people. Clinical findings are headache, jaw claudication, fever, pain, and thickening of the temporal artery. The most feared complication is visual loss due to impairment of the ophthalmic artery and posterior ciliary arteries. This a case report of an 85-year-old male presenting with headache and jaw pain, who was admitted with tongue necrosis as an initial manifestation of giant cell arteritis...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28424380/-schizotypy-detachment-or-magical-fusion
#15
János Kállai, Mária Simon, István Hartung, Béla Birkás, Róbert Herold
Nowadays, both in the clinical population, and in general communities, we tend to encounter an increasing number of personality disorder patients, whose social adjustment, partnerships and efficient life management is made difficult by the disorder. The ideas of borderline personality disorder patients, who fluctuate between farfetched expectations and fears of their selves being demolished, schizoid patients, who close their selves in their own alienating prison, avoidant patients, who try to escape difficulties, which would enhance their self-esteem, OCD patients, who build their own mythic superstitious world, and antisocial patients who tend to ignore and aggressively override others' interests are all important in the development of cultures with insecure identities...
2017: Psychiatria Hungarica: A Magyar Pszichiátriai Társaság Tudományos Folyóirata
https://www.readbyqxmd.com/read/28423313/power-grid-protection-of-the-muscle-mitochondrial-reticulum
#16
Brian Glancy, Lisa M Hartnell, Christian A Combs, Armel Fenmou, Junhui Sun, Elizabeth Murphy, Sriram Subramaniam, Robert S Balaban
Mitochondrial network connectivity enables rapid communication and distribution of potential energy throughout the cell. However, this connectivity puts the energy conversion system at risk, because damaged elements could jeopardize the entire network. Here, we demonstrate the mechanisms for mitochondrial network protection in heart and skeletal muscle (SKM). We find that the cardiac mitochondrial reticulum is segmented into subnetworks comprising many mitochondria linked through abundant contact sites at highly specific intermitochondrial junctions (IMJs)...
April 18, 2017: Cell Reports
https://www.readbyqxmd.com/read/28423280/does-nitrogen-lone-pair-lead-to-two-centered-three-electrons-2c-3e-interactions-in-pyridyl-radical-isomers
#17
Chitranjan Sah, Lilit Jacob, Mayank Saraswat, Sugumar Venkataramani
Each of the three isomeric pyridyl radicals (2-, 3- and 4-dehydropyridines) contains a lone pair and an unpaired electron. As a result, a potential two centered - three electron interaction between the radical electron and the lone pair through space (TS) and/or through bond (TB) can exist that may influence the stability of the radicals. Due to the change in geometrical positions relative to each other the strength of interaction can be varied. In this study, we investigated the structural and stability aspects of pyridyl radical isomers with a major emphasis on the interaction of nitrogen lone pair with the radical center...
April 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28423075/glass-microbeads-in-analog-models-of-thrust-wedges
#18
Taynara D'Angelo, Caroline J S Gomes
Glass microbeads are frequently used in analog physical modeling to simulate weak detachment zones but have been neglected in models of thrust wedges. Microbeads differ from quartz sand in grain shape and in low angle of internal friction. In this study, we compared the structural characteristics of microbeads and sand wedges. To obtain a better picture of their mechanical behavior, we determined the physical and frictional properties of microbeads using polarizing and scanning electron microscopy and ring-shear tests, respectively...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28422911/do-vented-chest-seals-differ-in-efficacy-an-experimental-evaluation-using-a-swine-hemopneumothorax-model
#19
Bijan S Kheirabadi, Irasema B Terrazas, Nahir Miranda, Spc Amber N Voelker, Francoise Arnaud, Harold G Klemcke, Frank F Butler, Michael A Dubick
OBJECTIVE: Hemopneumothorax (HPTX) is the second leading cause of potentially preventable death among combat casualties. We investigated the ability of five FDA-approved non-occlusive chest seals (CSs) to seal a bleeding chest wound and prevent tension HPTX in a swine model. METHODS: Following instrumentation, an open chest wound was created in the left thorax of spontaneously air-breathing anesthetized pigs (n=26, 43 Kg). Autologous fresh blood (226 mL) was then infused into the pleural cavity to produce HPTX...
April 18, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28421606/role-of-mucosa-in-generating-spontaneous-activity-in-the-guinea-pig-seminal-vesicle
#20
Mitsue Takeya, Hikaru Hashitani, Tokumasa Hayashi, Ryuhei Higashi, Kei-Ichiro Nakamura, Makoto Takano
The role of the mucosa in generating the spontaneous activity of guinea-pig seminal vesicle (SV) was explored. Changes in contractility, membrane potential and intracellular Ca(2+) dynamics of SV smooth muscle cells (SMCs) were recorded using isometric tension recording, intracellular microelectrode recording and epi-fluorescence Ca(2+) imaging, respectively. Mucosa-intact but not mucosa-denuded SV preparations generated TTX (1 μm)-resistant spontaneous phasic contractions that were abolished by nifedipine (3 μm)...
April 19, 2017: Journal of Physiology
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