31 resources related to Hair follicle
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The conference program will consist of plenary lectures, symposia, workshops andinvitedsessions of the latest significant findings and developments in all the major fields ofbiomedical engineering.Submitted papers will be peer reviewed. Accepted high quality paperswill be presented in oral and postersessions, will appear in the Conference Proceedings and willbe indexed in PubMed/MEDLINE & IEEE Xplore
Science, technology and applications spanning the millimeter-waves, terahertz and infrared spectral regions
It is our pleasure to invite you to participate in the 4st IEEE Middle East Conference on Biomedical Engineering (MECBME 2018), which will be hosted by IEEE Medicine and Biology Society (EMBS) Tunisia chapter and the IEEE Tunisia section, in collaboration with the REGIM-Lab. (University of Sfax, Tunisia).The conference will be held at the Ramada Plaza Hotel in Gammarth - Tunis (Tunisia) from March 28-30, 2018.MECBME 2018 is technically co-sponsored by IEEE Region 8 and IEEE Medicine and Biology Society (EMBS)
Haptic devices enable human-machine interaction through the senses of force and touch. WorldHaptics is the major nternational meeting addressing all aspects related to haptics, covering the basic scientific underpinnings, technological developments, and algorithms and applications.
BMEI is a premier international forum for scientists and researchers to present the state of the art of biomedical engineering and informatics. Specific topics include Biomedical imaging and visualization; Biomedical signal processing and analysis; etc.
The Field of Interest of the IEEE Sensors Journal is the science and applications of sensing phenomena, including theory, design, and application of devices for sensing and transducing physical, chemical, and biological phenomena. The emphasis is on the electronics, physics, biology, and intelligence aspects of sensors and integrated sensor-actuators. (IEEE Guide for Authors) (The fields of interest of the IEEE ...
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control was the number-three journal in acoustics in 2002, according to the annual Journal Citation Report (2002 edition) published by the Institute for Scientific Information. This publication focuses on the theory, design, and application on generation, transmission, and detection of bulk and surface mechanical waves; fundamental studies in physical acoustics; design of sonic ...
LEOS 2000. 2000 IEEE Annual Meeting Conference Proceedings. 13th Annual Meeting. IEEE Lasers and Electro-Optics Society 2000 Annual Meeting (Cat. No.00CH37080), 2000
The field of laser hair removal has undergone rapid evolution since the first Q-switched Nd:YAG system combined with carbon-black sensitizer was developed by Thermolase and cleared by the FDA in 1995. Today, numerous coherent and incoherent light sources are available for this application. To thermally damage the hair follicle without injuring the surrounding dermis, these systems target melanin in the ...
Proceedings of the IEEE-EMBS Special Topic Conference on Molecular, Cellular and Tissue Engineering, 2002
When performing hair transplantation procedures, it is of the foremost importance to try to obtain the maximum survival rate possible of transplanted micrografts. The aim of our studies were: to evaluate the effects of preserving micrografts, for 5 hours, in an enriched storage medium in order to enhance the survival rate of hair micrografts; to test the benefits provided by ...
Proceedings 2011 International Conference on Human Health and Biomedical Engineering, 2011
The preliminary laboratory study found that Prunus Tomentosa Thumb Total Flavone (PTTTF) had certain protection function on skin tissues and its subsidiary organs. Combined with civilian application experience, the study adopted C57BL 6 mouse phalacrosis models, the models were randomly divided into 5 groups with 10 in each group, namely: saline group (1 time / day), 70% ethanol group (1 ...
2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz Electronics, 2007
The presence of hair follicles in human skin appear not to disturb Terahertz (THz) transmission, but existing measurements made on human head hair show conflicting results on THz scattering. It is not known if large numbers of hair strands protruding from skin would affect THz transmission. This scenario is distinct from measuring clumps of head hair because hair strands on ...
Proceedings of the IEEE-EMBS Special Topic Conference on Molecular, Cellular and Tissue Engineering, 2002
The aim of this study was to evaluate, in an in vitro model, the survival and growth rates of transversely sectioned human hair follicles to assess experimentally the soundness of this approach as a future possible method for "duplicating" available donor hair grafts in hair transplantation procedures. Furthermore, we have grafted bisected hair follicles in 11 inbred mice, in order ...
The field of laser hair removal has undergone rapid evolution since the first Q-switched Nd:YAG system combined with carbon-black sensitizer was developed by Thermolase and cleared by the FDA in 1995. Today, numerous coherent and incoherent light sources are available for this application. To thermally damage the hair follicle without injuring the surrounding dermis, these systems target melanin in the hair shaft/follicle with wavelengths in the 700-1100 nm range. The stem cells, which are responsible for hair-follicle regrowth, are located at the connective tissue sheath in a ring concentric with the hair shaft at a depth of 0.8-1.2 mm below the skin surface. According to one theory, the stem cells (which do not contain melanin) must be damaged to achieve permanent hair removal. Thus the entire follicular structure bounded by the connective tissue sheath should be heated to the 65-70/spl deg/C thermal denaturation temperature. Since only the hair shaft and matrix contain melanin, the rest of the follicle can be damaged by either explosive vaporization of the hair shaft/matrix or by thermal diffusion. Most light- based hair-removal devices currently on the market utilize relatively long (1-100 ms) pulses to damage hair follicles. For pulsewidths in this range (neglecting explosive vaporization), only part of the follicle is thermally damaged because the temperature at the connective tissue sheath remains below the denaturation temperature. Explosive vaporization of the hair shaft/matrix may create areas of damage out to the connective tissue sheath, but the damage patterns are unpredictable. For pulsewidths in the 0.1-1 second range (super long pulse), the temperature at the connective tissue sheath exceeds 65-70/spl deg/C, but the surrounding tissue remains below the denaturation temperature. Thus the entire follicle volume is thermally denatured while the surrounding dermal tissue remains viable.
When performing hair transplantation procedures, it is of the foremost importance to try to obtain the maximum survival rate possible of transplanted micrografts. The aim of our studies were: to evaluate the effects of preserving micrografts, for 5 hours, in an enriched storage medium in order to enhance the survival rate of hair micrografts; to test the benefits provided by cold-storing hair grafts; to quantify the survival and growth rates of "plucked" human hair follicles; to compare the growth rates of follicular units, conventional, and skeletonized micrografts maintained in culture for 10 days. According to our data, the described method is, in our opinion, an useful adjunct in order to quantitatively evaluate the effects of various procedures in the field of hair transplantation surgery.
The preliminary laboratory study found that Prunus Tomentosa Thumb Total Flavone (PTTTF) had certain protection function on skin tissues and its subsidiary organs. Combined with civilian application experience, the study adopted C57BL 6 mouse phalacrosis models, the models were randomly divided into 5 groups with 10 in each group, namely: saline group (1 time / day), 70% ethanol group (1 time / day), PTTTF group I (1% PTTTF tincture, 1 time / day), 5% minoxidil tincture group (1 time / day) and PTTTF group II (1% PTTTF tincture, 2 times / day), with the PTTTF was used in external local parts continuously, the length mean of new hair was measured, meanwhile, the tissues of the phalacrosis zones were selected for pathological analysis. The results showed that PTTTF can prominently prolong the hair growth cycle, promote hair growth and promote follicle maturation. Tip: PTTTF has stronger role in promoting hair growth.
The presence of hair follicles in human skin appear not to disturb Terahertz (THz) transmission, but existing measurements made on human head hair show conflicting results on THz scattering. It is not known if large numbers of hair strands protruding from skin would affect THz transmission. This scenario is distinct from measuring clumps of head hair because hair strands on skin (particularly on animals) are not bound together, are oriented randomly, are mostly thinner than head hair, and have slightly varying lengths. This study presents measured THz data on excised rat skin before and after shortening/removal of hair. Results show that the THz signals before and after hair shortening/removal are similar. A mathematical model is also presented to elucidate the effects of rough surfaces on THz reflection mode spectroscopy.
The aim of this study was to evaluate, in an in vitro model, the survival and growth rates of transversely sectioned human hair follicles to assess experimentally the soundness of this approach as a future possible method for "duplicating" available donor hair grafts in hair transplantation procedures. Furthermore, we have grafted bisected hair follicles in 11 inbred mice, in order to in vivo evaluate the soundness of this procedure. A total of 300 human anagen hair follicles were thus randomly assigned to one of the following groups: group A, cultured intact as dissected, and group B, transversely transected. Regarding the in vivo animal model, we have prepared 96 emimicrografts transplanted in the dorsum of the inbred mice. No statistically significant differences were found between the growth rate of intact follicles and of lower-half follicles, whereas a statistically significant difference was found between the growth rate of follicles from the two above mentioned groups and the growth rate of the "upper-half" follicles. In our opinion, the reported in vitro and in vivo survival rates of transected human hair follicles represent an interesting starting point in striving to augment the number of donor hairs available during a hair transplantation procedure.
This paper focused on studying the effect of diode laser on the burn healing. The study is based on using 32 mature, male albino mice divided into four groups, all groups were burned using an electrical soldering unit on the back of each mouse for five seconds to create a 3<sup>rd</sup> degree burn of 1 cm in length. Two groups were treated with diode laser. The first group (S1) is treated with 785nm, 3.5mW CW diode laser for 3 minutes to get energy density = 3J/cm<sup>2</sup>. The second group (S2) is illuminated by using CW diode laser of 637nm, 2mW for 5 minutes with the same energy density, while the pulsed group (group S3) is treated by pulsed diode laser (637nm) of pulse repetition frequency (p.r.f) 1 KHz and duty cycles, 50%. One group of these animals was not irradiated by laser energy. It is used as a control group. The animals were irradiated three times per week. The first laser irradiation was given immediately after burn creation followed by the two other exposures at the next 2<sup>nd</sup> and 3<sup>rd</sup> day after burning. The histological assessment was started at day 4 after the burn and carried on for 25 days; once per week. The results showed that for a CW laser groups; the re- epithelialization appear one week earlier in laser group S2 (CW-637nm wavelength, 2mW) at day 18, while in the control group appear only at day 25 after burn. The hair follicles in this group seem to appear more quickly than the control group. The pulsed laser showed also better results comparing to the result of CW diode laser.
We propose a tactile enhancement structure inspired by hair follicle receptors. Unlike other receptors, part of the hair follicle receptor is exposed to the outside. Recent research has shown that skin hair contributes to perception of minute forces that cannot be perceived with glabrous skin. We considered how the skin perceives these minute forces. Our tactile enhancement device mimics the structure of hair follicle receptors. A matrix structure simulating artificial body hair is driven by minute forces external to the skin surface. This structure can be used on any surface of the human body because it is fully composed of passive elements.
Low level laser therapy is widely used to relieve pain and inflammation, and to restore cellular functions. The photons of light are absorbed by mitochondria in cells, leading to an increase in the production of adenosine triphosphate (ATP), nitric oxide release, blood flow, and reactive oxygen species (ROS). This study proposed the use of a laser diode array at 808 nm to stimulate the proliferation and to activate the functions of dermal papilla cells, which were an important part of the hair growth cycle. These cells were isolated from human hair follicles and were exposed to 808 nm light at various doses from 0.5, 1, 2.5, 4, and 6 J/cm<sup>2</sup>. The rate of cell proliferation and the gene expression profile of dermal papilla cells were investigated and compared with the control in which the cells did not received any light treatment. The growth curves of the dermal papilla cells were used to determine the specific growth rates. Higher specific growth rates were observed in the cells exposed to laser at doses higher than 0.5 J/cm<sup>2</sup>. The effect of the laser light treatment on several gene markers, specifically for dermal papilla cells, was evaluated using real-time polymerase chain reaction (qPCR). Our result shows that collagen type 1 (Col1), alkaline phosphatase (Alp), and versican (Vcan) did not increase when the cells were irradiated by the laser light. Interestingly, sex determining region y-box 2 (Sox2) gene was up-regulated when 0.5 J/cm<sup>2</sup>, and 1 J/cm<sup>2</sup> light was used, while an increase in the level of fibroblast growth factor 7 (Fgf7) gene was observed with light irradiation at 0.5 J/cm<sup>2</sup>, 1 J/cm<sup>2</sup>, 2.5 J/cm<sup>2</sup>, and 4 J/cm<sup>2</sup>. Too high irradiation dose was shown to yield no effect on the gene expression of dermal papilla cells.
The rationale of this paper is the silver nanoparticles' responsive behavior by activating adult stem cells of mesodermal and ectodermal in vivo origin. Reports on regeneration of hair follicles in rabbit skin, meaning an accelerated healing of surgical wounds and a process of hair follicle neogenesis, produced by subcutaneous implantation of some nanofibers functionalized with silver nanoparticles have been highlighted. Another laboratory scaled injury model of rat striated muscle, showed an enhanced histological aspect of healed muscle comparing to placebo, by using an oily nanodispersion of silver. In vitro stimulation of mesenchymal stem cells by silver nanoparticles has also been reported by the literature. However, it is noteworthy to mention that even if the silver nanoparticles do not produce mesenchymal stem differentiation in vitro, the interleukin 6 and 8 secreted by mesenchymal stem cells under the action of these nanoparticles, could accelerate the healing of cutaneous lesions. Moreover, the process of hair follicle neogenesis found in our studies would not be possible, without proliferation and differentiation of hair follicle stem cells. An assumed confirmation of the above mentioned hypothesis will open a new research direction toward silver nanoparticles, using in plastic and reconstructive surgery, degenerative diseases and anti-aging therapy. Specific histological methods concerning the responsive behavior of the stem cells in injured tissues, which are treated with pharmacological preparations containing silver nanoparticles, will be used. Taking into account the experimental studies showing a pronounced regenerative /responsive behavior of silver nanoparticles, novel pharmaceutical formulations with topic response have been synthesized.
Near-infrared spectroscopy (NIRS) has increasingly been used to noninvasively determine hemodynamic concentration change noninvasively by detecting light intensity changes. The effect of scalp hair follicle (SHF) on NIRS quantification is highlighted since its dark pigmentations is a strong absorption source to contaminate the NIRS signal. Here we have incorporated the Monte Carlo modeling for light transport in voxelized media, and visible Chinese human with high precision in depicting three-dimensional human anatomical structures, to study the effect of SHF density on NIRS quantification. The results quantified the strong impact of SHF on NIRS measurements and revealed that the detected light intensity signal decreased by 15%–80% when SHF density varied from 1% to 11.1% at Asian human range. More surprisingly, the hemodynamics-interpreted brain activation could be miscalculated by 11.7%–292.24% linearly with SHF density varied in 1%–11.1%. It is the first time that the effect of SHF on NIRS measurements has been quantitatively evaluated and the dramatic influence of SHF is outlined to be seriously concerned. The finding of the linear correlation between NIRS signal underestimation and the density of scalp hair follicles also indicate a potential calibration method to eliminate the SHF effect on NIRS measurement.
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