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https://www.readbyqxmd.com/read/28525712/engineering-hydrogen-bonding-interaction-and-charge-separation-in-bio-polymers-for-green-lubrication
#1
Liwen Mu, Yijun Shi, Jing Hua, Wei Zhuang, Jiahua Zhu
Synthetic additives are widely used in lubricants nowadays to upgrade lubrication properties. The potential of integrating sustainable components in modern lubricants has rarely been studied yet. In this work, two sustainable resources lignin and gelatin have been synergistically incorporated into ethylene glycol (EG) and their tribological properties were systematically investigated. The abundant hydrogen bonding sites in lignin and gelatin as well as their inter-chain interaction via hydrogen bonding play the dominating roles in tuning the physicochemical properties of the mixture and improving lubricating properties...
May 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28514709/protein-adsorption-on-implant-metals-with-various-deformed-surfaces
#2
Zhongwei Wang, Yu Yan, Lijie Qiao
The adsorption of proteins has great influence on the biocompatibility, lubrication and corrosion properties of implantable metals. The subsurface microstructure of metals can be easily changed during the manufacturing or service processes and it is easily ignored. The same chemical composition but with various surface microstructures can result in very different adsorption behaviour. In this study, mechanical polishing, electrochemical polishing and shot peening methods were used to generate different gradient deformed surfaces for CoCrMo alloys...
May 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28514245/comparison-of-ocular-lubricant-osmolalities
#3
Etty Bitton, Carolyn Perugino, Stéphanie Charette
PURPOSE: The aim of this study was to evaluate the osmolality of commercially available ocular tear lubricants. METHODS: Thirty-seven (n = 37) ocular lubricants, measured three times each, were evaluated for osmolality using a vapor pressure osmometer (Wescor VAPRO 5520). The osmometer was calibrated before each use, and the order of the lubricants was randomized. Ambient temperature and humidity were monitored for stability. RESULTS: Of the 37 ocular lubricants tested, 35 (94...
May 16, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28513499/role-of-mini-scleral-lens-in-mucous-membrane-pemphigoid
#4
Mukesh Kumar, Rohit Shetty, Chaitra Jayadev
This study aims to report the use of mini-scleral contact lens in the management of mucous membrane pemphigoid (MMP) with persistent epithelial defects. A 68-year-old male with a history of ocular pain and declining visual acuity was referred to our clinic with a diagnosis of MMP. His corrected distance visual acuity (CDVA) was 20/200 in the right eye and 20/100 in the left eye. Despite being on lubricants, topical steroids and intravenous cyclophosphamide, the patient developed persistent corneal epithelial defects in both eyes...
April 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28501788/dynamic-femoral-head-translations-in-dysplastic-hips
#5
Tatsuya Sato, Hiromasa Tanino, Yasuhiro Nishida, Hiroshi Ito, Takeo Matsuno, Scott A Banks
BACKGROUND: Developmental dysplasia of the hip is an important disease leading to osteoarthritis. Recently, researchers have focused on hip instability as a potentially important dynamic factor for osteoarthritis, but the detailed kinematics of dysplastic hips during weight-bearing gait have not been reported. The purpose of this research is to contrast femoral translation in contralateral healthy hips and dysplastic hips during weight-bearing stepping. METHODS: Twelve dysplastic hips and eight healthy hips were investigated...
May 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28501001/one-pot-chemo-enzymatic-synthesis-of-furfuralcohol-from-xylose
#6
Yu-Cai He, Chun-Xia Jiang, Ji-Wei Jiang, Jun-Hua Di, Feng Liu, Yun Ding, Qing Qing, Cui-Luan Ma
Furfuralcohol (FOL) is an important intermediate for the production of lysine, ascorbic acid, and lubricants. It can be used as a hypergolic fuel in rocketry. In this study, it was attempted to synthesize FOL from xylose by tandem catalysis with solid acid SO4(2-)/SnO2-Montmorillonite and recombination Escherichia coli CCZU-K14 whole cells. Using SO4(2-)/SnO2-Montmorillonite (3.0wt% dosage) as catalyst, a highest furfural yield of 41.9% was achieved from xylose at 170°C for 20min. Furthermore, Escherichia coli CCZU-K14 whole cells were used for bioconverting furfural to FOL...
April 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28500999/effects-of-working-gas-pressure-on-zirconium-dioxide-thin-film-prepared-by-pulsed-plasma-deposition-roughness-wettability-friction-and-wear-characteristics
#7
M Berni, G Marchiori, A Gambardella, M Boi, M Bianchi, A Russo, A Visani, M Marcacci, P G Pavan, N F Lopomo
In joint arthroplasty one of the main issues related to the failure of prosthetic implants is due to the wear of the ultra-high molecular weight polyethylene (UHMWPE) component. Surface treatments and coatings have been recognized as enhancing methods, able to improve the tribological properties of the implants. Therefore, the main objective of this work was to investigate the possibility to fabricate yttria-stabilized zirconia (YSZ) coatings on a metal (AISI 316-L) substrate by means of Pulsed Electron Deposition, in order to improve the tribological behavior of the polymer-metal coupling, by reducing the initial wear of the UHMWPE component...
May 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28497970/electrowetting-of-weak-polyelectrolyte-coated-surfaces
#8
Vincent Sénéchal, Hassan Saadaoui, Juan Rodriguez-Hernandez, Carlos Drummond
Polymer coatings are commonly used to modify interfacial properties like wettability, lubrication, or biocompatibility. These properties are determined by the conformation of polymer molecules at the interface. Polyelectrolytes are convenient elementary bricks to build smart materials, given that polyion chain conformation is very sensitive to different environmental variables. Here we discuss the effect of an applied electric field on the properties of surfaces coated with poly(acrylic acid) brushes. By combining atomic force microscopy, quartz crystal microbalance, and contact angle experiments, we show that it is possible to precisely tune polyion chain conformation, surface adhesion, and surface wettability using very low applied voltages if the polymer grafting density and environmental conditions (pH and ionic strength) are properly formulated...
May 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28497859/superlubricity-between-mos2-monolayers
#9
He Li, Jinhuan Wang, Song Gao, Qing Chen, Lianmao Peng, Kaihui Liu, Xianlong Wei
The ultralow friction between atomic layers of hexagonal MoS2 , an important solid lubricant and additive of lubricating oil, is thought to be responsible for its excellent lubricating performances. However, the quantitative frictional properties between MoS2 atomic layers have not been directly tested in experiments due to the lack of conventional tools to characterize the frictional properties between 2D atomic layers. Herein, a versatile method for studying the frictional properties between atomic-layered materials is developed by combining the in situ scanning electron microscope technique with a Si nanowire force sensor, and the friction tests on the sliding between atomic-layered materials down to monolayers are reported...
May 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28496503/sexual-therapy-for-women-with-multiple-sclerosis-and-its-impact-on-quality-of-life
#10
Maryam Zamani, Azadeh Tavoli, Behjat Yazd Khasti, Neda Sedighimornani, Masood Zafar
Objective: Multiple Sclerosis (MS) is a disease with a detrimental effect on functional status. The present study investigated the effect of a sexual therapy program on the quality of life (QOL) of women with multiple sclerosis. Method: Women with multiple sclerosis and sexual dysfunction (n = 30) were selected, and were randomly assigned into the treatment (n = 15), or the control groups (n = 15). Participants of the treatment group (n = 15) received 12 weekly sessions of sexual therapy. Participants in both groups completed the Female Sexual Function Inventory (FSFI) and the MS Quality of Life- 54 (MSQOL-54) in the onset of the program and at the end of the program...
January 2017: Iranian Journal of Psychiatry
https://www.readbyqxmd.com/read/28492147/female-sexual-dysfunction-in-the-late-postpartum-period-among-women-with-previous-gestational-diabetes-mellitus
#11
Mehmet Akif Sargin, Murat Yassa, Bilge Dogan Taymur, Bulent Taymur, Gizem Akca, Niyazi Tug
OBJECTIVE: To compare the status of female sexual dysfunction (FSD) between women with a history of previous gestational diabetes mellitus (GDM) and those with follow-up of a healthy pregnancy, using the female sexual function index (FSFI) questionnaire. STUDY DESIGN: Cross-sectional study. PLACE AND DURATION OF STUDY: Department of Obstetrics and Gynecology, Fatih Sultan Mehmet Training and Research Hospital, Istanbul, Turkey, from September to December 2015...
April 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28492016/vaginal-rejuvenation-using-energy-based-devices
#12
REVIEW
Cheryl Karcher, Neil Sadick
Physiologic changes in a woman's life, such as childbirth, weight fluctuations, and hormonal changes due to aging and menopause, may alter the laxity of the vaginal canal, damage the pelvic floor, and devitalize the mucosal tone of the vaginal wall. These events often lead to the development of genitourinary conditions such as stress urinary incontinence; vaginal atrophy; dryness; and physiologic distress affecting a woman's quality of life, self-confidence, and sexuality. Various treatment modalities are currently available to manage these indications, varying from invasive vaginal surgery to more benign treatments like topical vaginal hormonal gels or hormone-replacement therapy...
September 2016: International Journal of Women's Dermatology
https://www.readbyqxmd.com/read/28488715/van-der-waals-interaction-between-a-moving-nano-cylinder-and-a-liquid-thin-film
#13
René Ledesma-Alonso, Elie Raphaël, Thomas Salez, Philippe Tordjeman, Dominique Legendre
We study the static and dynamic interaction between a horizontal cylindrical nano-probe and a thin liquid film. The effects of the physical and geometrical parameters, with a special focus on the film thickness, the probe speed, and the distance between the probe and the free surface are analyzed. Deformation profiles have been computed numerically from a Reynolds lubrication equation, coupled to a modified Young-Laplace equation, which takes into account the probe/liquid and the liquid/substrate non-retarded van der Waals interactions...
May 10, 2017: Soft Matter
https://www.readbyqxmd.com/read/28486478/effect-of-chronic-estradiol-plus-progesterone-treatment-on-experimental-arterial-and-venous-thrombosis-in-mouse
#14
Marie-Cécile Valéra, Emmanuelle Noirrit-Esclassan, Marion Dupuis, Melissa Buscato, Alexia Vinel, Maeva Guillaume, Anne Briaux, Cédric Garcia, Thibaut Benoit, Olivier Lairez, Coralie Fontaine, Bernard Payrastre, Jean-François Arnal
Postmenopausal hormone replacement therapy (HRT) with estrogen plus progestogens is the first line therapy to treat menopausal symptoms. The progestogen is added to estrogen to reduce or eliminate the excess risk of endometrial cancer due to the unopposed effect of estrogen. Whereas progestin clearly opposes the proliferative and deleterious long-term actions of estrogen on the endometrium, the interference of progestin on the other estrogen action remains unclear. We previously reported that chronic subcutaneous 17α-estradiol (E2) in mice decreases platelet responsiveness, prolongs the tail-bleeding time and protects against acute thromboembolism...
2017: PloS One
https://www.readbyqxmd.com/read/28484730/the-relation-of-diabetes-type-2-with-sexual-function-among-reproductive-age-women-in-iran-a-case-control-study
#15
Poorandokht Afshari, Shiva Yazdizadeh, Parvin Abedi, Homayra Rashidi
Background. Diabetic patients are at the greater risk of retinopathy, nephropathy, neuropathy, and sexual dysfunction compared to the general population. Objective. The aim of this study was to evaluate the sexual dysfunction in type 2 diabetes reproductive age women in Iran. Method. This was a case-control study carried out on 130 women with type 2 diabetes and 130 healthy women. The type 2 diabetes diagnosis was confirmed with abnormal fasting blood sugar, abnormal random blood sugar test, and abnormal level of HbA1C...
2017: Advances in Medicine
https://www.readbyqxmd.com/read/28482643/female-sexual-dysfunction-in-presymptomatic-mutation-carriers-and-patients-with-huntington-s-disease
#16
Matej Kolenc, Jan Kobal, Simon Podnar
BACKGROUND: Although in Huntington's disease (HD) movement, cognition, and personality are most significantly affected, autonomic dysfunction should not be neglected. In women with HD sexual dysfunction has not been adequately studied yet. OBJECTIVE: To report sexual dysfunction in a systematically studied cohort of female HD patients and compare it with controls of a similar age. METHODS: In female HD patients and presymptomatic HD mutation carriers, we compared the Female Sexual Function Index (FSFI) questionnaire, neurologic assessment using the Unified Huntington's Disease Rating Scale (UHDRS) and the Total Functional Capacity (TFC)...
May 5, 2017: Journal of Huntington's Disease
https://www.readbyqxmd.com/read/28480642/effect-of-hap-and-%C3%AE-tcp-incorporation-on-the-tribological-response-of-ti6al4v-biocomposites-for-implant-parts
#17
T A Dantas, M M Costa, G Miranda, F S Silva, C S Abreu, J R Gomes
Titanium and its alloys have been widely used in many engineering areas due to their properties. Despite having a high implant-tissue osseointegration time, Ti6Al4V has been extensively used in prosthesis and articular implants. To promote a faster bone ingrowth and consequently reduce the implant fixation time, the addition of a bioactive phase to form a biocomposite seems to be an excellent solution. Because of their bioactivity and similarity in composition with the human bone, HAp and β-TCP are two of the most widely used calcium phosphates in biomedical applications...
May 8, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28476153/-when-they-know-that-you-are-a-sex-worker-you-will-be-the-last-person-to-be-treated-perceptions-and-experiences-of-female-sex-workers-in-accessing-hiv-services-in-uganda
#18
Rhoda K Wanyenze, Geofrey Musinguzi, Juliet Kiguli, Fred Nuwaha, Geoffrey Mujisha, Joshua Musinguzi, Jim Arinaitwe, Joseph K B Matovu
BACKGROUND: HIV prevalence among female sex workers (FSWs) in high burden countries in sub-Saharan Africa varies between 24 and 72%, however their access to HIV services remains limited. This study explored FSWs' perspectives of the barriers and opportunities to HIV service access in Uganda. METHODS: The cross-sectional qualitative study was conducted between October and December 2013. Twenty-four focus group discussions were conducted with 190 FSWs in 12 districts...
May 5, 2017: BMC International Health and Human Rights
https://www.readbyqxmd.com/read/28473052/silica-based-systems-for-oral-delivery-of-drugs-macromolecules-and-cells
#19
REVIEW
Roudayna Diab, Nadia Canilho, Ileana A Pavel, Fernanda B Haffner, Maxime Girardon, Andreea Pasc
According to the US Food and Drug Administration and the European Food Safety Authority, amorphous forms of silica and silicates are generally recognized to be safe as oral delivery ingredients in amounts up to 1500mg per day. Silica is used in the formulation of solid dosage forms, e.g. tablets, as glidant or lubricant. The synthesis of silica-based materials depends on the payload nature, drug, macromolecule or cell, and on the target release (active or passive). In the literature, most of the examples deal with the encapsulation of drugs in mesoporous silica nanoparticles...
April 20, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28470741/canine-oral-mucosa-evaluation-as-a-potential-autograft-tissue-for-the-treatment-of-unresponsive-keratoconjunctivitis-sicca
#20
Rose L Cherry, Jodi D Smith, Gil Ben-Shlomo
PURPOSE: Labial mucosa transplantation for the treatment of canine keratoconjunctivitis sicca (KCS) has been reported recently. Postoperative alleviation of clinical signs was noted and assumed to be the result of labial salivary glands providing lubrication to the ocular tissue. The aim of this study was to evaluate the presence of minor salivary glands (MSG) in the canine oral mucosa. METHODS: Oral mucosal biopsies were collected from six dogs that died (n = 1) or were euthanized (n = 5) for reasons unrelated to this study...
May 4, 2017: Veterinary Ophthalmology
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