Amino-Fe 3 O 4 -functionalized graphene oxide as a novel adsorbent of Methylene Blue: kinetics, equilibrium, and recyclability aspects

Abstract

Graphene oxide (GO) was synthetized from graphite oxidation via the modified Hummers method. Afterwards, the GO was functionalized with diethylenetriamine (DETA) and FeCl₃ to obtain the novel amino-iron oxide functionalized graphene (GO-NH₂-Fe₃O₄). FTIR, XRD, SEM with EDX, and Raman spectroscopy were performed to characterize both GO and GO-NH₂-Fe₃O₄. The GO-NH₂-Fe₃O₄ was then evaluated as adsorbent of the cationic dye Methylene Blue (MB); analysis of the point of zero net charge (pH_PZC) and pH effect showed that the GO-NH₂-Fe₃O₄ pH_PZC was 8.2; hence, the MB adsorption was higher at pH 12.0. Adsorption kinetics studies indicated that the system reached the equilibrium state after 5 min, with adsorption capacity at equilibrium (q_e) and kinetic constant (k_S) of 966.39 mg g⁻¹ and 3.17∙10⁻² g mg⁻¹ min⁻¹, respectively; moreover, the pseudo-second-order model was better fitted to the experimental data. Equilibrium studies showed maximum adsorption capacity of 1047.81 mg g⁻¹; furthermore, Langmuir isotherm better fitted the adsorption. Recycling experiments showed that the GO-NH₂-Fe₃O₄ maintained the MB removal rate above 95% after 10 cycles. All the results showed sorbent high adsorption capacity and outstanding regeneration capability and evidenced the employment of novel GO-NH₂-Fe₃O₄ as a profitable adsorbent of textile dyes.

https://ift.tt/2O23kZb

Association between age at menopause and fracture risk: a systematic review and meta-analysis

Abstract

Purpose

Early menopause (EM, age at menopause < 45 years) and premature ovarian insufficiency (POI, age at menopause < 40 years) are associated with an increased risk of osteoporosis. However, their association with increased fracture risk has not been established, with studies yielding conflicting results. The primary aim of this systematic review and meta-analysis was to synthesize studies evaluating the association between age at menopause and fracture risk. The secondary aim was to evaluate this effect concerning the site of fractures.

Methods

A comprehensive search was conducted in PubMed, CENTRAL and Scopus, up to 31 January 2018. Data were expressed as odds ratio (OR) with 95% confidence intervals (CI). The I² index was employed for quantifying heterogeneity.

Results

Eighteen studies were included in the qualitative and quantitative analysis (462,393 postmenopausal women, 12,130 fractures). Compared with women with age at menopause > 45 years, women with EM demonstrated higher fracture risk (OR 1.36, 95% CI 1.11–1.66, p < 0.002, I² 81.5%). Women with POI did not display any difference in fracture risk compared either with women with age at menopause > 40 (OR 1.23, 95% CI 0.72–2.09, p = 0.436, I² 62.5%) or >45 years (OR 0.54, 95% CI 0.22–1.29, p = 0.17, I² 0%). No difference was evident when a separate analysis was performed for vertebral, non-vertebral and hip fractures.

Conclusions

This is the first meta-analysis showing that EM is associated with increased fracture risk compared with normal age at menopause, without any distinct effect on the site of the fracture.

https://ift.tt/2QjkSBS

Association between age at menopause and fracture risk: a systematic review and meta-analysis

Abstract

Purpose

Early menopause (EM, age at menopause < 45 years) and premature ovarian insufficiency (POI, age at menopause < 40 years) are associated with an increased risk of osteoporosis. However, their association with increased fracture risk has not been established, with studies yielding conflicting results. The primary aim of this systematic review and meta-analysis was to synthesize studies evaluating the association between age at menopause and fracture risk. The secondary aim was to evaluate this effect concerning the site of fractures.

Methods

A comprehensive search was conducted in PubMed, CENTRAL and Scopus, up to 31 January 2018. Data were expressed as odds ratio (OR) with 95% confidence intervals (CI). The I² index was employed for quantifying heterogeneity.

Results

Eighteen studies were included in the qualitative and quantitative analysis (462,393 postmenopausal women, 12,130 fractures). Compared with women with age at menopause > 45 years, women with EM demonstrated higher fracture risk (OR 1.36, 95% CI 1.11–1.66, p < 0.002, I² 81.5%). Women with POI did not display any difference in fracture risk compared either with women with age at menopause > 40 (OR 1.23, 95% CI 0.72–2.09, p = 0.436, I² 62.5%) or >45 years (OR 0.54, 95% CI 0.22–1.29, p = 0.17, I² 0%). No difference was evident when a separate analysis was performed for vertebral, non-vertebral and hip fractures.

Conclusions

This is the first meta-analysis showing that EM is associated with increased fracture risk compared with normal age at menopause, without any distinct effect on the site of the fracture.

https://ift.tt/2QjkSBS

Paediatric mastocytosis: long‐term follow‐up of 53 patients with whole sequencing of KIT. A prospective study

British Journal of Dermatology, EarlyView.


https://ift.tt/2Qia8n5

Cutaneous epidermotropic metastasis of an oesophageal squamous cell carcinoma: Wound healing and transepidermal elimination as possible mechanisms for epidermotropism

Australasian Journal of Dermatology, EarlyView.


https://ift.tt/2Qi5PrN

A case of lymphomatoid papulosis, pityriasis lichenoides acuta, and mycosis fungoides coexistence

Australasian Journal of Dermatology, EarlyView.


https://ift.tt/2CDjWW8

One versus two eyes makes a difference! Early face perception is modulated by featural fixation and feature context

Publication date: Available online 8 September 2018

Source: Cortex

Author(s): Karisa B. Parkington, Roxane J. Itier

Abstract

The N170 event-related potential component is an early marker of face perception that is particularly sensitive to isolated eye regions and to eye fixations within a face. Here, this eye sensitivity was tested further by measuring the N170 to isolated facial features and to the same features fixated within a face, using a gaze-contingent procedure. The neural response to single isolated eyes and eye regions (two eyes) was also compared. Pixel intensity and contrast were controlled at the global (image) and local (featural) levels. Consistent with previous findings, larger N170 amplitudes were elicited when the left or right eye was fixated within a face, compared to the mouth or nose, demonstrating that the N170 eye sensitivity reflects higher-order perceptual processes and not merely low-level perceptual effects. The N170 was also largest and most delayed for isolated features, compared to equivalent fixations within a face. Specifically, mouth fixation yielded the largest amplitude difference, and nose fixation yielded the largest latency difference between these two contexts, suggesting the N170 may reflect a complex interplay between holistic and featural processes. Critically, eye regions elicited consistently larger and shorter N170 responses compared to single eyes, with enhanced responses for contralateral eye content, irrespective of eye or nasion fixation. These results confirm the importance of the eyes in early face perception, and provide novel evidence of an increased sensitivity to the presence of two symmetric eyes compared to only one eye, consistent with a neural eye region detector rather than an eye detector per se.

https://ift.tt/2Nv5Jib

Adolescents with autism show typical fMRI repetition suppression, but atypical surprise response

Publication date: Available online 8 September 2018

Source: Cortex

Author(s): Christian Utzerath, Iris C. Schmits, Jan Buitelaar, Floris P. de Lange

Abstract

Recent theoretical frameworks have hypothesized that autism spectrum disorder (ASD) may be marked by an altered balance between sensory inputs and prior knowledge – the so-called hypoprior hypothesis. Yet evidence regarding such an altered balance is mixed. Here, we aimed to test this hypothesis within the domain of visual perception, by examining how neural activity in the visual system was modulated by stimulus repetition and stimulus expectation in healthy and ASD participants.

We presented 22 adolescents with ASD and 22 typically developing (TD) adolescents with pairs of object stimuli, while measuring brain activity using functional magnetic resonance imaging (fMRI). Stimulus pairs could be stimulus repetitions or not and could be expected or not. We examined neural activity in early (V1) and object-selective (LOC) visual cortex.

Both ASD and TD individuals showed robust and equal repetition suppression in LOC. By contrast, ASD and TD groups showed a different response to expected versus unexpected stimuli, specifically in V1. Thereby, our results suggest that while the more automatic modulation of activity by repetition is unaffected in ASD, there is some evidence that the balance between sensory evidence and prior knowledge may indeed be altered in early visual cortex of ASD.

https://ift.tt/2CBmfZJ

Anosognosia For Chronic Dysphagia

Publication date: Available online 8 September 2018

Source: Cortex

Author(s): Nicoletta Beschin, Cristina Reverberi, Sergio Della Sala

https://ift.tt/2Nuz8sD

Antibiotic exposure is associated with cutaneous adverse events in hairy cell leukemia patients treated with purine analogs

Publication date: Available online 8 September 2018

Source: Journal of the American Academy of Dermatology

Author(s): Rebecca F. Wang, Daniel Li, Gina J. Kuehn, Leslie A. Andritsos, Michael R. Grever, Benjamin H. Kaffenberger

https://ift.tt/2oRda5l

Recurrent fevers, progressive lipodystrophy and annular plaques in a child

Publication date: Available online 8 September 2018

Source: Journal of the American Academy of Dermatology

Author(s): Michael A. Cardis, Gina A. Montealegre Sanchez, Raphaela Goldbach-Mansky, Chyi-Chia Richard Lee, Edward W. Cowen

https://ift.tt/2CC6ykT

Response to the Letter to the Editor entitled, “Use of immortal time within survival analysis”: JAAD-D-18-01157

Publication date: Available online 8 September 2018

Source: Journal of the American Academy of Dermatology

Author(s): Charles Kyung Min Lee, Shufeng Li, Duy Cong Tran, Gefei Alex Zhu, Jinah Kim, Bernice Y. Kwong, Anne Lynn S. Chang

https://ift.tt/2oQavIW

Scholar : Behaviour & Information Technology, Volume 37, Issue 9, September 2018 is now available online on Taylor & Francis Online

The online platform for Taylor & Francis Online content Behaviour & Information Technology, Volume 37, Issue 9, September 2018 is now available online on Taylor & Francis Online. Highlights from ECCE 2018 This new issue contains the following articles: Editorial Editorial Panos Markopoulos, Christian Stary, Françoise Detienne & Herre van Oostendorp Pages: 873-873 | DOI: 10.1080/0144929X.2018.1519089 Articles Enhancing the quality of service of mobile video technology by increasing multimodal synergy F. van der Sluis, E. L. van den Broek, A. van Drunen & J. G. Beerends Pages: 874-883 | DOI: 10.1080/0144929X.2018.1505954 How to evaluate emotional experiences in television drama series: improving viewer evaluations using a combination of psychophysiological measurements and self-reports Lene Heiselberg & Thomas Bjørner Pages: 884-893 | DOI: 10.1080/0144929X.2018.1505953 The Konect value – a quantitative method for estimating perception time and accuracy for HMI designs Marie-Christin Harre & Sebastian Feuerstack Pages: 894-903 | DOI: 10.1080/0144929X.2018.1505952 Cognitive work analysis in the conceptual design of first-of-a-kind systems – designing urban air traffic management | Jonas Lundberg, Mattias Arvola, Carl Westin, Stefan Holmlid, Mathias Nordvall & Billy Josefsson Pages: 904-925 | DOI: 10.1080/0144929X.2018.1505951 Profiling ethics orientation through play Carlos Pereira Santos, Vassilis-Javed Khan & Panos Markopoulos Pages: 926-935 | DOI: 10.1080/0144929X.2018.1508501 To update which email alerts you receive, manage your alerts within the My Account area. Unsubscribe from new content alerts for this journal (both new issue and latest article notifications) with one click. If you need any further help, please contact us at support@tandfonline.com Please do not reply to this email. To ensure that you receive your alerts and information from Taylor & Francis Online, please add "alerts@tandfonline.com" and "info@tandfonline.com" to your safe senders list. Taylor & Francis, an Informa business. Taylor & Francis is a trading name of Informa UK Limited, registered in England under no. 1072954. Registered office: 5 Howick Place, London, SW1P 1WG.

News and Notices

Clinical and Experimental Dermatology, Volume 43, Issue 7, Page 863-863, October 2018.


https://ift.tt/2NrS5fI

Issue Information

Clinical and Experimental Dermatology, Volume 43, Issue 7, Page i‐ii, 757-758, October 2018.


https://ift.tt/2CC3jKt

Sex‐dependent changes in neuroactive steroid concentrations in the rat brain following acute swim stress

Journal of Neuroendocrinology, Volume 0, Issue ja, -Not available-.


https://ift.tt/2oTzfAg

Tolerability and efficacy of a medical device repairing emollient cream in adults with chronic hand dermatitis

Journal of Cosmetic Dermatology, EarlyView.


https://ift.tt/2QaFDj3

Image gallery: Hairy‐cell leukaemia presenting with Sweet syndrome

British Journal of Dermatology, Volume 0, Issue ja, -Not available-.


https://ift.tt/2oRQUbt

Fertility induction in hypogonadotropic hypogonadal men

Clinical Endocrinology, Volume 0, Issue ja, -Not available-.


https://ift.tt/2MeqA4r

Protopanaxatriol inhibits melanin synthesis through inactivation of the pCREB–MITF–tyrosinase signalling pathway in melanocytes

Clinical and Experimental Dermatology, EarlyView.


https://ift.tt/2CMGO5J

Topical ingenol mebutate for viral wart on the ear

Dermatologic Therapy, Volume 0, Issue ja, -Not available-.


https://ift.tt/2wXULYe

Efficacy of omalizumab in severe chronic spontaneous urticaria: real life data from a Greek tertiary center

Dermatologic Therapy, Volume 0, Issue ja, -Not available-.


https://ift.tt/2NsSHlj