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https://www.readbyqxmd.com/read/29907958/the-mechanosensory-motor-apparatus-of-antennae-in-the-oleander-hawk-moth-daphnis-nerii-lepidoptera
#1
Harshada H Sant, Sanjay P Sane
Insect antennae are sensory organs of great importance because they can sense diverse environmental stimuli. In addition to serving as primary olfactory organs of insects, antennae also sense a wide variety of mechanosensory stimuli, ranging from low-frequency airflow or gravity cues to high-frequency antennal vibrations due to sound, flight or touch. The basal segments of the antennae house multiple types of mechanosensory structures that prominently include the sensory hair plates, or Böhm's bristles, which measure the gross extent of antennal movement, and a ring of highly sensitive scolopidial neurons, collectively called the Johnston's organs, which record subtle flagellar vibrations...
June 15, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29901503/consumer-hair-dye-kits-frequently-contain-isothiazolinones-other-common-preservatives-and-fragrance-allergens
#2
Dathan Hamann, Patrick Kishi, Carsten R Hamann
No abstract text is available yet for this article.
January 2018: Dermatitis
https://www.readbyqxmd.com/read/29899264/the-late-stages-of-melanogenesis-exploring-the-chemical-facets-and-the-application-opportunities
#3
REVIEW
Lucia Panzella, Atsuko Ebato, Alessandra Napolitano, Kenzo Koike
In the last decade, the late stages of melanin biosynthesis involving the oxidative polymerization of 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) have been extensively investigated. Most of the information derived from a biomimetic approach in which the oxidation of melanogenic indoles was carried out under conditions mimicking those occurring in the biological environment. Characterization of the early oligomers allowed for drawing a structural picture of DHI and DHICA melanins, providing also an interpretative basis for the different properties exhibited by these pigments, e...
June 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29851976/mycorrhizal-lipochitinoligosaccharides-lcos-depolarize-root-hairs-of-medicago-truncatula
#4
Anna-Lena Hürter, Sébastien Fort, Sylvain Cottaz, Rainer Hedrich, Dietmar Geiger, M Rob G Roelfsema
Arbuscular Mycorrhiza and Root Nodule Symbiosis are symbiotic interactions with a high benefit for plant growth and crop production. Thus, it is of great interest to understand the developmental process of these symbioses in detail. We analysed very early symbiotic responses of Medicago truncatula root hair cells, by stimulation with lipochitinoligosaccharides specific for the induction of nodules (Nod-LCOs), or the interaction with mycorrhiza (Myc-LCOs). Intracellular micro electrodes were used, in combination with Ca2+ sensitive reporter dyes, to study the relations between cytosolic Ca2+ signals and membrane potential changes...
2018: PloS One
https://www.readbyqxmd.com/read/29808681/application-of-anthocyanins-from-blackcurrant-ribes-nigrum-l-fruit-waste-as-renewable-hair-dyes
#5
Paul M Rose, Victoria Cantrill, Meryem Benohoud, Alenka Tidder, Christopher M Rayner, Richard S Blackburn
There is much concern about the toxicological effects of synthetic hair dyes. As an alternative approach, renewable waste blackcurrant ( Ribes nigrum L.) fruit skins from the fruit pressing industry were extracted using acidified water with a solid-phase purification stage. Anthocyanin colorants were isolated in good yields (2-3% w/ w) and characterized by HPLC. Sorption of anthocyanins onto hair followed a Freundlich isotherm; anthocyanin-anthocyanin aggregation interactions enabled high buildup on the substrate...
May 29, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29777444/comparison-of-lawsone-contents-among-lawsonia-inermis-plant-parts-and-neurite-outgrowth-accelerators-from-branches
#6
Yoshimi Oda, Souichi Nakashima, Erina Kondo, Seikou Nakamura, Mamiko Yano, Chisa Kubota, Yusuke Masumoto, Minami Hirao, Yuki Ogawa, Hisashi Matsuda
Lawsonia inermis L. (Lythraceae) is cultivated in many countries, including Japan, China, India and Egypt. Its leaves are well known as hair dye and exhibit antibacterial, anticancer, antifungal and anticonvulsant activities. However, there are few reports on its branches. 2-Hydroxy-1,4-naphthoquinone (lawsone) is a characteristic compound in its leaves. However, it remains to be clarified whether lawsone is present in other plant parts or not. In this study, we measured lawsone contents in the extracts of L...
May 17, 2018: Journal of Natural Medicines
https://www.readbyqxmd.com/read/29767482/multicenter-clinical-trial-on-a-permanent-hair-dye-containing-paratoluenediamine
#7
Caterina Foti, Nicola Balato, Antonio Cristaudo, Cataldo Patruno, Paolo Pigatto, Marina Ambrifi, Tamara Bufano, Giovanni Damiani, Mariagrazia De Rocco, Marco Diani, Maddalena Napolitano, Paolo Romita
BACKGROUND: Adverse reactions to hair dyes are frequent and usually caused by sensitization to paraphenylenediamine (PPD). The aim of the study was to evaluate the tolerability of a PPD-free permanent hair dye (Shine On, BioNike, Milan, Italy) containing paratoluenediamine (PTD) in a group of subjects sensitized to PPD. METHODS: The trial, which carried out at four dermatology centers, included subjects sensitized to PPD that turned out negative to patch testing to PTD...
August 2018: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
https://www.readbyqxmd.com/read/29743046/the-effect-of-pre-pregnancy-hair-dye-exposure-on-infant-birth-weight-a-nested-case-control-study
#8
Chao Jiang, Qingzhi Hou, Yaling Huang, Juan Ye, Xiaolian Qin, Yu Zhang, Wen Meng, Qiuyan Wang, Yonghua Jiang, Haiying Zhang, Mujun Li, Zengnan Mo, Xiaobo Yang
BACKGROUND: Limited evidences were reported about the risk of pre-pregnancy hair dye use or irregular menstruation with abnormal birth weight during pregnancy, and their joint effects were also unknown. The aim of our study was to explore whether the pre-pregnancy exposure of hair dye and irregular menstruation were associated with the risk of abnormal birth weight. METHODS: We conducted a nested case-control study from a prospective cohort of 6203 pregnant women...
May 9, 2018: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/29673419/combination-of-ultrasound-assisted-cloud-point-extraction-with-spectrophotometry-for-extraction-preconcentration-and-determination-of-low-levels-of-free-formaldehyde-from-cosmetic-products
#9
Nuket Kartal Temel, Ramazan Gürkan
In the present study, a new preconcentration method was developed to quantify the free formaldehyde (FA) in hair cosmetics by combining ultrasound-assisted cloud-point extraction with spectrophotometry. The method is based on the ion association of FA with cationic phenothiazine group dye, toluidine blue in presence of sulfite at pH 5.0, and then extraction of the formed complex into the micellar phase of nonionic surfactant, Triton X-114. The analyte extracted into the micellar phase was diluted with ethanol, and then detected at 630 nm by spectrophotometer...
April 19, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29666910/ontogeny-and-development-of-the-tritocerebral-commissure-giant-tcg-an-identified-neuron-in-the-brain-of-the-grasshopper-schistocerca-gregaria
#10
George Stephen Boyan, Leslie Williams, Tobias Müller, Jonathan P Bacon
The tritocerebral commissure giant (TCG) of the grasshopper Schistocerca gregaria is one of the best anatomically and physiologically described arthropod brain neurons. A member of the so-called Ventral Giant cluster of cells, it integrates sensory information from visual, antennal and hair receptors, and synapses with thoracic motor neurons in order to initiate and regulate flight behavior. Its ontogeny, however, remains unclear. In this study, we use bromodeoxyuridine incorporation and cyclin labeling to reveal proliferative neuroblasts in the region of the embryonic brain where the ventral giant cluster is located...
April 17, 2018: Development Genes and Evolution
https://www.readbyqxmd.com/read/29658875/new-aspects-of-the-structure-of-human-scalp-hair-ii-tubular-structure-and-material-flow-property-of-the-medulla
#11
Asao Yamauchi, Kiyoshi Yamauchi
Asian scalp hair fibers were made thin by treatment with papain or sliced along the longitudinal axis or randomly cut by mechanical means. Optical microscopic observations of the resulting specimens indicated that (i) the medulla (M) consisted of two types of the M-surrounding cells which were linearly linked one another to form a tubular structure running through the fiber and (ii) the drum-shaped vesicles containing small proteinous granules were neatly or sparsely stored within the tube. On the other hand, H+ and OH- ions were able to move spontaneously from one end to another through the M tube...
January 2018: Journal of Cosmetic Science
https://www.readbyqxmd.com/read/29643913/hair-dye-poisoning-an-early-intervention
#12
Syed Farrukh Umair, Imrana Amin, Ata Urrehman
The use of hair dye has been emerging worldwide however usage of Paraphenylenediamine (PPD) in making hair dye is generally restricted to underdeveloped and developing countries. In particular, prevalence of accidental and suicidal ingestion is more in low socioeconomic areas. The spectra of hair dye toxicity is wide, however, it presents more commonly with severe angioedema of face and neck leading to respiratory failure, rhabdomyolysis complicating into acute kidney injury, myocarditis and acute liver injury...
January 2018: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29607000/basaloid-follicular-hamartoma-a-case-report-and-a-novel-cosmetic-treatment
#13
Kelly Segars, Hassie Cooper, Daniel J Hogan, Richard Miller, Michael Heaphy, James Spencer
Introduction: Basaloid follicular hamartoma (BFH) is a rare, benign neoplasm of the hair follicle, characterized by multiple brown papules involving the face, scalp, and trunk. It is described by multiple clinical forms, and can present as localized or generalized. Diagnosis is made histologically via biopsy, which is important in order to distinguish BFH from basal cell carcinoma (BCC) or other malignant epithelial neoplasms. Correct diagnosis allows for the avoidance of unnecessary surgeries to remove benign lesions...
March 2018: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/29601618/the-use-of-a-self-occluding-topical-anasthetic-in-daily-practice-a-non-interventional-study
#14
Ravi Jain, Gerardo Moreno Arias, Pablo Naranjo, Max Murison, Jose Luis López Estebaranz, Alina Fratila, Welf Prager, Carlos Guillén Barona, Michael Weidmann, Serge Dahan, Hugues Cartier, Gerhard Sattler, Maurizio Podda
INTRODUCTION: A variety of topical anesthetic creams are available to reduce pain associated with dermatological procedures. Pliaglis is a self-occluding eutectic mixture of lidocaine and tetracaine. STUDY OBJECTIVES: To evaluate the post-marketing safety profile of Pliaglis and efficacy in terms of pain reduction, product satisfaction, and daily practice use prior to pre-defined dermatological procedures. METHODS: A prospective, non-interventional study conducted at 44 sites in four European countries; 581 patients were treated prior to dermatological procedures such as pulsed-dye laser therapy, laser-assisted hair removal, non-ablative laser resurfacing, dermal filler injections, and vascular access...
April 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29596886/environmental-and-occupational-exposure-to-resorcinol-in-finland
#15
Simo P Porras, Minna Hartonen, Katriina Ylinen, Jarkko Tornaeus, Tapani Tuomi, Tiina Santonen
Resorcinol is a suspected endocrine disruptor that affects thyroid function by inhibiting thyroxin peroxidase. It may also have an impact on iodine uptake. Resorcinol has various uses; for example in the manufacture of rubber products and in wood adhesives, flame retardants, UV stabilizers, and dyes. It is also used in personal care products such as hair colorants, anti-acne preparations, and peels. The aim of this study was to assess both environmental background exposure and occupational exposure to resorcinol in Finland...
March 27, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29574979/allergic-contact-dermatitis-caused-by-1-naphthol-a-red-coupler-in-a-purple-permanent-oxidative-hair-dye
#16
Thomas King, Ruth Sabroe, Catherine Holden
No abstract text is available yet for this article.
March 25, 2018: Contact Dermatitis
https://www.readbyqxmd.com/read/29556436/an-alkaline-bacterial-laccase-for-polymerization-of-natural-precursors-for-hair-dye-synthesis
#17
Deepak Kumar, Aditya Kumar, Sonica Sondhi, Prince Sharma, Naveen Gupta
In the present study, an extracellular alkali stable laccase (Lac DS) from Bacillus subtilis DS which has pH optima at 8.5 using p -phenylenediamine (PPD) as substrate has been reported. Lac DS retained 70% activity for 4 h at pH 8.5 and 90% activity for 24 h at 55 °C. The enzyme yield was enhanced by optimization of fermentation conditions. A 746-fold increase in yield was observed under optimized conditions using 150 µM MgSO4 , 1.2% yeast extract, 0.35% tryptone, and 150 µM vanillic acid. Lac DS was used to polymerize natural dye precursor catechol, pyrogallol, syringaldehyde, syringic acid, ferulic acid and gallic acid to develop a range of natural hair colors such as black, golden yellow, and reddish brown...
March 2018: 3 Biotech
https://www.readbyqxmd.com/read/29530615/skin-sensitization-quantitative-risk-assessment-for-occupational-exposure-of-hairdressers-to-hair-dye-ingredients
#18
Carsten Goebel, Thomas L Diepgen, Brunhilde Blömeke, Anthony A Gaspari, Axel Schnuch, Anne Fuchs, Kordula Schlotmann, Maya Krasteva, Ian Kimber
Occupational exposure of hairdressers to hair dyes has been associated with the development of allergic contact dermatitis (ACD) involving the hands. p-Phenylenediamine (PPD) and toluene-2,5-diamine (PTD) have been implicated as important occupational contact allergens. To conduct a quantitative risk assessment for the induction of contact sensitization to hair dyes in hairdressers, available data from hand rinsing studies following typical occupational exposure conditions to PPD, PTD and resorcinol were assessed...
June 2018: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29496197/allergic-contact-dermatitis-due-to-paraphenylenediamine-an-update
#19
B Encabo Durán, D Romero-Pérez, J F Silvestre Salvador
Paraphenylenediamine (PPD) is an amine that is mainly used as an ingredient in hair dyes and henna tattoos. The incidence of allergic contact dermatitis to PPD is increasing, particularly in younger patients. In this article, we review the main sources of PPD and the substances with which it can interact and present a practical algorithm for diagnosing and treating suspected cases of PPD allergy.
February 26, 2018: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/29482183/maternal-use-of-personal-care-products-during-pregnancy-and-risk-of-testicular-germ-cell-tumors-in-sons
#20
Armen A Ghazarian, Britton Trabert, Kim Robien, Barry I Graubard, Katherine A McGlynn
BACKGROUND: The etiology of testicular germ cell tumors (TGCT) is poorly understood, however, exposure to endocrine disrupting chemicals (EDCs) may be related to increased risk. Personal care products, some of which contain EDCs, are widely used on a daily basis and are known to cross the placenta, be present in breastmilk, and are capable of inducing reproductive tract abnormalities. To determine the association between personal care product use during pregnancy and breastfeeding and TGCT risk, an analysis among mothers of TGCT cases and controls was conducted...
July 2018: Environmental Research
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