keyword
MENU ▼
Read by QxMD icon Read
search

Oxygen delivery

keyword
https://www.readbyqxmd.com/read/29684688/layer-by-layer-hollow-photosensitizer-microcapsule-design-via-a-manganese-carbonate-hard-template-for-photodynamic-therapy-in-cells
#1
Andreza Ribeiro Simioni, Priscila Costa Carvalho de Jesus, Antonio Claudio Tedesco
BACKGROUND: Microcapsules fabricated using layer-by-layer self-assembly have unique properties, making them attractive for drug delivery applications. The technique has been improved, allowing the deposition of multiple layers of oppositely charged polyelectrolytes on spherical, colloidal templates. These templates can be decomposed by coating multiple layers, resulting in hollow shells. In this paper, we describe a novel drug delivery system for loading photosensitizer drugs into hollow multilayered microcapsules for photoprocess applications...
April 20, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29683458/isolation-of-human-endothelial-cells-from-normal-colon-and-colorectal-carcinoma-an-improved-protocol
#2
Elisabeth Naschberger, Daniela Regensburger, Clara Tenkerian, Melanie Langheinrich, Felix B Engel, Carol Geppert, Arndt Hartmann, Robert Grützmann, Vera S Schellerer, Michael Stürzl
Primary cells isolated from human carcinomas are valuable tools to identify pathogenic mechanisms contributing to disease development and progression. In particular, endothelial cells (EC) constituting the inner surface of vessels, directly participate in oxygen delivery, nutrient supply, and removal of waste products to and from tumors, and are thereby prominently involved in the constitution of the tumor microenvironment (TME). Tumor endothelial cells (TECs) can be used as cellular biosensors of the intratumoral microenvironment established by communication between tumor and stromal cells...
April 4, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29683388/hematocrit-and-impact-of-transfusion-in-patients-receiving-extracorporeal-life-support
#3
Justyna Swol, Christopher Marschall, Justus T Strauch, Thomas A Schildhauer
INTRODUCTION: Increasing the hematocrit is considered to increase oxygen delivery to the patient, especially when hypoxic conditions exist and the patient may become more stable. The aim of this study was to evaluate the relationship between hematocrit and hospital mortality via subgroup analyses of trauma and non-trauma patients. METHODS: The hospital length of stay (LOS) and LOS in the intensive care unit (ICU) and hospital after extracorporeal life support (ECLS) treatment of 81 patients were analyzed and compared...
April 1, 2018: Perfusion
https://www.readbyqxmd.com/read/29680471/the-neu-prem-trial-neuromonitoring-of-brains-of-infants-born-preterm-during-resuscitation-a-prospective-observational-cohort-study
#4
Anup C Katheria, M J Harbert, Sunil B Nagaraj, Kathy Arnell, Debra M Poeltler, Melissa K Brown, Wade Rich, Kasim O Hassen, Neil Finer
OBJECTIVE: To determine whether monitoring cerebral oxygen tissue saturation (StO2 ) with near-infrared spectroscopy (NIRS) and brain activity with amplitude-integrated electroencephalography (aEEG) can predict infants at risk for intraventricular hemorrhage (IVH) and death in the first 72 hours of life. STUDY DESIGN: A NIRS sensor and electroencephalography leads were placed on 127 newborns <32 weeks of gestational age at birth. Ten minutes of continuous NIRS and aEEG along with heart rate, peripheral arterial oxygen saturation, fraction of inspired oxygen, and mean airway pressure measurements were obtained in the delivery room...
April 16, 2018: Journal of Pediatrics
https://www.readbyqxmd.com/read/29679806/an-intelligent-dual-stimuli-responsive-photosensitizer-delivery-system-with-o-2-supplying-for-efficient-photodynamic-therapy
#5
Hongjuan Zhao, Li Li, Cuixia Zheng, Yongwei Hao, Mengya Niu, Yujie Hu, Junbiao Chang, Zhenzhong Zhang, Lei Wang
The effects of photodynamic therapy (PDT) are limited by the hypoxic tumor microenvironment (TME). In this paper, a new type of biocompatible multifunctional photosensitizer delivery system was fabricated to relieve tumor hypoxia and improve the efficacy of PDT. The photosensitizer hematoporphyrin monomethyl ether (HMME) and catalase (CAT) were encapsulated in the pores of mesoporous graphitic-phase carbon nitride nanosheets (mpg-C3 N4 ). Next, hyaluronic (HA) was coated on the surface of the mpg-C3 N4 via an amide linkage to construct the tumor-targeting HAase/CAT dual activatable and mpg-C3 N4 /HMME response photosensitizer delivery system (HA@mpg-C3 N4 -HMME/CAT)...
April 10, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29679541/treatment-with-d-%C3%AE-hydroxybutyrate-protects-heart-from-ischemia-reperfusion-injury-in-mice
#6
Yongsheng Yu, Yunhua Yu, Yuefan Zhang, Zhigang Zhang, Weishuai An, Xianxian Zhao
The present study was designed to examine the protection of D-β-hydroxybutyrate (BHB) against ischemia/reperfusion (I/R) injury in heart and investigate its underlying mechanism. Male adult mice were exposed to 30min of ischemia and 24h of reperfusion. Osmotic pumps were implanted subcutaneously 5min before reperfusion for continuous delivery of the exogenous BHB (1.6mmol/kg/24h). Treatment with BHB reduced infarct size and levels of cardiac troponin I, creatine kinase and lactate dehydrogenase in serum, attenuated apoptosis in myocardium, and preserved cardiac function of I/R mice...
April 18, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29678953/metabolic-adjustment-to-high-altitude-hypoxia-from-genetic-signals-to-physiological-implications
#7
REVIEW
Andrew J Murray, Hugh E Montgomery, Martin Feelisch, Michael P W Grocott, Daniel S Martin
Ascent to high altitude is associated with physiological responses that counter the stress of hypobaric hypoxia by increasing oxygen delivery and by altering tissue oxygen utilisation via metabolic modulation. At the cellular level, the transcriptional response to hypoxia is mediated by the hypoxia-inducible factor (HIF) pathway and results in promotion of glycolytic capacity and suppression of oxidative metabolism. In Tibetan highlanders, gene variants encoding components of the HIF pathway have undergone selection and are associated with adaptive phenotypic changes, including suppression of erythropoiesis and increased blood lactate levels...
April 20, 2018: Biochemical Society Transactions
https://www.readbyqxmd.com/read/29677597/the-systematic-evaluation-of-size-dependent-toxicity-and-multi-time-biodistribution-of-gold-nanoparticles
#8
Xiaomin Li, Zhenpeng Hu, Jinlong Ma, Xinyu Wang, Yapei Zhang, Wei Wang, Zhi Yuan
As a promising nanomaterial, gold nanoparticles (Au NPs) have been widely applied in diagnosis, drug and gene delivery, and photothermal therapy. However, the toxicity and biodistribution profile of differently sized Au NPs still remains controversial and incomplete, thus hindering their further applications. Herein, a systematic evaluation of size effect on toxicity and multi-time (from 4 h to 90 days) biodistribution of Au NPs ranging from 6.2 nm to 61.2 nm was conducted. The in vitro toxicity by MTT assays manifested that toxicity could be distinctly observed and increased with size decreasing when the dose of Au NPs reached up to a certain amount (1 mM)...
April 4, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29677351/retinal-oxygen-delivery-and-metabolism-in-healthy-and-sickle-cell-retinopathy-subjects
#9
Mahnaz Shahidi, Anthony E Felder, Ou Tan, Norman P Blair, David Huang
Purpose: Reduction in inner retinal oxygen delivery (DO2) can cause retinal hypoxia and impair inner retinal oxygen metabolism (MO2), leading to vision loss. The purpose of the current study was to establish measurements of DO2 and MO2 in healthy subjects and test the hypothesis that DO2 and MO2 are reduced in sickle cell retinopathy (SCR) subjects. Methods: Dual wavelength retinal oximetry and Doppler optical coherence tomography were performed in 12 healthy control and 12 SCR subjects...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29677087/military-supplement-perfluorocarbon-gas-transport-an-overview-of-medical-history-with-yet-unrealized-potentials
#10
Bruce D Spiess
Perfluorocarbon (PFCs) compounds have been a hereto fore under realized pharmaceutical class of intravenous emulsions and respiratory adjuvants researched extensively since the late 1970. This review represents an introduction for a series of more detailed lectures/manuscripts that were part of a combined United States collaborative Federal agency meeting in early February, 2017 at Ft Detrick, MD, focused upon potential technologies in development to fulfill a perceived need: "When blood transfusion is not available...
April 19, 2018: Shock
https://www.readbyqxmd.com/read/29677080/corm-401-reduces-ischemia-reperfusion-injury-in-an-ex-vivo-renal-porcine-model-of-the-donation-after-cardiac-death
#11
Rabindra N Bhattacharjee, Mahms Richard-Mohamed, Qizhi Sun, Aaron Haig, Ghaleb Aboalsamh, Peter Barrett, Richard Mayer, Ibrahim Alhasan, Karen Pineda-Solis, Larry Jiang, Hajed Alharbi, Manujendra Saha, Eric Patterson, Alp Sener, Gediminas Cepinskas, Anthony M Jevnikar, Patrick P W Luke
BACKGROUND: Carbon monoxide (CO) inhalation protects organ by reducing inflammation and cell death during transplantation processes in animal model. However, using CO in clinical transplantation is difficult due to its delivery in a controlled manner. A manganese-containing CORM-401 has recently been synthesized which can efficiently deliver 3 molar equivalents of CO. We report the ability of this anti-inflammatory CORM-401 to reduce ischemia reperfusion injury associated with prolonged cold storage of renal allografts obtained from donation after cardiac death in a porcine model of transplantation...
April 19, 2018: Transplantation
https://www.readbyqxmd.com/read/29675862/hemodialysis-a-model-for-extreme-physiology-in-a-vulnerable-patient-population
#12
REVIEW
Jeroen P Kooman, Krassimir Katzarski, Frank M van der Sande, Karel M Leunissen, Peter Kotanko
Hemodialysis (HD) is a lifesaving treatment for patients with end-stage renal disease, which is very efficient in the correction of abnormalities of the internal environment. However, this efficiency also induces significant hemodynamic, thermal, and respiratory stressors. These have parallels with the extreme physiologic demands which are normally mainly experienced by healthy subjects under adverse environmental conditions, with the difference that they must be endured by a vulnerable patient population. Hemodynamic stress induced by ultrafiltration leads to a decline in circulating blood volume, which may result in intradialytic hypotension (IDH) and changes in tissue perfusion, which may have long-term consequences for the function of vital organs such as the brain and the heart...
April 19, 2018: Seminars in Dialysis
https://www.readbyqxmd.com/read/29675842/oxygen-to-little-too-much-or-just-right
#13
EDITORIAL
Pontus B Persson, Anja B Persson
Supply and demand, delivery obstacles and a number of complex systems to classify shortages - in physiology texts, oxygen appears to be one of the most in depth- researched commodity on the market. Classifications of the different states of "too little oxygen in relation to demand" usually start of textbook chapters and never cease to cause a lot of confusion among learners. The immediate and long-term effects of varying oxygen tensions, their consequences and pathophysiological relevance are what most of the journal articles that come up in databases when you enter hypoxia as a search term are centred on...
April 19, 2018: Acta Physiologica
https://www.readbyqxmd.com/read/29675543/improved-vaccine-induced-immune-responses-via-a-ros-triggered-nanoparticle-based-antigen-delivery-system
#14
Xiaoyu Liang, Jianwei Duan, Xuanling Li, Xiaowei Zhu, Youlu Chen, Xiaoli Wang, Hongfan Sun, Deling Kong, Chen Li, Jing Yang
Subunit vaccines that are designed based on recombinant antigens or peptides have shown promising potential as viable substitutes for traditional vaccines due to their better safety and specificity. However, the induction of adequate in vivo immune responses with appropriate effectiveness remains a major challenge for vaccine development. More recently, the implementation of a nanoparticle-based antigen delivery system has been considered a promising approach to improve the in vivo efficacy for subunit vaccine development...
April 20, 2018: Nanoscale
https://www.readbyqxmd.com/read/29674752/protecting-the-ischaemic-penumbra-as-an-adjunct-to-thrombectomy-for-acute-stroke
#15
REVIEW
Jean-Claude Baron
After ischaemic stroke, brain damage can be curtailed by rescuing the 'ischaemic penumbra' - that is, the severely hypoperfused, at-risk but not yet infarcted tissue. Current evidence-based treatments involve restoration of blood flow so as to salvage the penumbra before it evolves into irreversibly damaged tissue, termed the 'core'. Intravenous thrombolysis (IVT) can salvage the penumbra if given within 4.5 h after stroke onset; however, the early recanalization rate is only ~30%. Direct removal of the occluding clot by mechanical thrombectomy considerably improves outcomes over IVT alone, but despite early recanalization in > 80% of cases, ~50% of patients who receive this treatment do not enjoy functional independence, usually because the core is already too large at the time of recanalization...
April 19, 2018: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/29673646/polymeric-micelles-encapsulating-ph-responsive-doxorubicin-prodrug-and-glutathione-activated-zinc-ii-phthalocyanine-for-combined-chemotherapy-and-photodynamic-therapy
#16
Di Gao, Pui-Chi Lo
A series of polymeric micelles encapsulating different ratios of doxorubicin (DOX) and zinc(II) phthalocyanine (ZnPc) have been prepared for dual chemotherapy and photodynamic therapy (PDT). The amphiphilic block copolymers consist of methoxypolyethylene glycol (PEG) and poly(β-benzyl-l-aspartate) (PBLA), in which DOX and ZnPc were conjugated to the aspartate side chain through an acid-labile hydrazone linker and a redox-responsive disulfide linker, respectively. The polymers were self-assembled into spherical polymeric micelles with diameters of about 160-180 nm and their surface charges were found to be nearly neutral due to the outermost PEG layer...
April 16, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29670348/effects-of-hydrogenated-tio-2-nanotube-arrays-on-protein-adsorption-and-compatibility-with-osteoblast-like-cells
#17
Ran Lu, Caiyun Wang, Xin Wang, Yuji Wang, Na Wang, Joshua Chou, Tao Li, Zhenting Zhang, Yunhan Ling, Su Chen
Background: Modified titanium (Ti) substrates with titanium dioxide (TiO2 ) nanotubes have broad usage as implant surface treatments and as drug delivery systems. Methods: To improve drug-loading capacity and accelerate bone integration with titanium, in this study, we hydrogenated anodized titanium dioxide nanotubes (TNTs) by a thermal treatment. Three groups were examined, namely: hydrogenated TNTs (H2 -TNTs, test), unmodified TNTs (air-TNTs, control), and Ti substrates (Ti, control)...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29670347/alpcs-4-pdt-for-gastric-cancer-therapy-using-gold-nanorod-cationic-liposome-and-pluronic-%C3%A2-f127-nanomicellar-drug-carriers
#18
Jing Xin, Sijia Wang, Bing Wang, Jiazhuang Wang, Jing Wang, Luwei Zhang, Bo Xin, Lijian Shen, Zhenxi Zhang, Cuiping Yao
Purpose: As a promising photodynamic therapy (PDT) agent, Al(III) phthalocyanine chloride tetrasulfonic acid (AlPcS4 ) provides deep penetration into tissue, high quantum yields, good photostability, and low photobleaching. However, its low delivery efficiency and high binding affinity to serum albumin cause its low penetration into cancer cells, further limiting its PDT effect on gastric cancer. In order to improve AlPcS4 /PDT effect, the AlPcS4 delivery sys tems with different drug carriers were synthesized and investigated...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29668768/cardiovascular-and-respiratory-effects-of-lumbosacral-epidural-bupivacaine-in-isoflurane-anesthetized-dogs-the-effects-of-two-volumes-of-0-25-solution
#19
Raquel Sartori Gonçalves Dias, João Henrique Neves Soares, Douglas Dos Santos E Castro, Maria Alice Kuster de Albuquerque Gress, Marcela Lemos Machado, Pablo E Otero, Fabio Otero Ascoli
The purpose of this study was to compare cardiovascular and respiratory effects of two volumes of bupivacaine 0.25% (0.2 mL kg-1-treatment BUP02-and 0.4 mL kg-1 -treatment BUP04) administered epidurally at the lumbosacral intervertebral space in dogs anesthetized with isoflurane. This experimental prospective randomized crossover design trial used six mixed breed adult dogs, four neutered males and two spayed females. Each dog was anesthetized on three different occasions: the first for isoflurane minimum alveolar concentration (MAC) measurement, and the following two assigned treatments (BUP02 or BUP04)...
2018: PloS One
https://www.readbyqxmd.com/read/29668341/silicon-dioxide-nanoparticle-exposure-affects-small-intestine-function-in-an-in-vitro-model
#20
Zhongyuan Guo, Nicole J Martucci, Yizhong Liu, Eusoo Yoo, Elad Tako, Gretchen J Mahler
The use of nanomaterials to enhance properties of food and improve delivery of orally administered drugs has become common, but the potential health effects of these ingested nanomaterials remain unknown. The goal of this study is to characterize the properties of silicon dioxide (SiO2 ) nanoparticles (NP) that are commonly used in food and food packaging, and to investigate the effects of physiologically realistic doses of SiO2 NP on gastrointestinal (GI) health and function. In this work, an in vitro model composed of Caco-2 and HT29-MTX co-cultures, which represent absorptive and goblet cells, was used...
April 18, 2018: Nanotoxicology
keyword
keyword
82691
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"