j. Cosmet. sci., 52, 325-327 (September/October 2001) Abstracts Journal of the Society of Cosmetic Chemists Japan Vol. 34, No. 4, 2000* Impression of Physical Appearance and Its Influence to Others Mariko Yamamoto Department of Psychology, University of Tsukuba In this review, the author's research on the influence of physical appearance (with the focus on the face) impression on self and others, and an overview of the studies on the physical appearance is presented. First, I present the controllability of appearance in impression change. That is, even the same physical appearance has both easy aspect and difficult aspect to change impression. Moreover, it is indicated that depending on the high and low controllability of impression change, there might be differences in the content changed impression. Next, the inl•)rmation processing of physical appearance is presented. The information on physical appearance has a strong influence on the information processing of others, especially with regard to earlier stage. The influence involves stereotypes of appearance. In addition, depending on the lkatures of physical appearance how the behavior of self and others is influenced is discussed. Finally, operating the process of self presentation through physical appearance and individual differences regarding sensitiveness to self presentation are discussed. Reduction of Langerhans Cell Number by Repeated Challenges of Low Dose UVB IrradiationYukiko Ishitsuka, Takuji Masunaga, Chiharu Koide, Kumi Arakane Fundamental Research Laboratory, KOSE Corporation important in developing sun care cosmetics. While the damages caused by exposure to high dose ultraviolet irradiation have been studied so far, the influence of repeated low dose ultraviolet irradiation has remained unclear. The purpose of this study was to clarify the influence of repeated sub erythema ultraviolet irradiation to the skin, and to investigate the effect of natural herbs preventing ultraviolet damage to develop skin care products. The backs of hairless mice were exposed to ultraviolet (UVB) irradiation at 100 mJ cm2xl time, 50Mj cm2 (1MED)x2 times, 25mJ cm2x4times, or 10mJ cm2xl 0 times, followed by taking the skin specimens for histochemical examinations. The population of epidermal Langerhans cells in the specimens, which was employed as a marker for skin damage, exposed to repeated sub erythema doses was reduced to approximately 40 of non irradiated control, whereas that in the specimen exposed to a single high dose was only 67. Furthermore, Langerhans cells demonstrated less dendricity with exposure to ultraviolet irradiation. Clearly, the repeated sub erythema doses induced greater damage than the single high dose exposure. Besides, we found that Phellodendron bark extract and Glycyrrhiza extract were effective in combating ultraviolet induced reduction of Langerhans cells number. In conclusion, the repeated challenges of even sub erythema ultraviolet irradiation to which we are exposed in daily life can cause substantial damage to the epidermis, and it is necessary to prevent this damage. It is common knowledge that ultraviolet irradiation damages human skin. Understanding the mechanism by which this damage occurs is * These abstracts appear exactly as they were originally published. They have not been edited by the Journal of Cosmetic Science. 325

326 JOURNAL OF COSMETIC SCIENCE The Relationship between Sebum Composition, Facial Skin Condition and Seasonal Changes Masaru Kenjo, Sayuri Okura, Miho Toda, Chikako Kaneko, Naoko Ota Safety Analytical Research Center, POLA Chemical Industries, Inc. Sebum secretion onto skin surfaces is a normal process, and plays an important role in the protection of skin. However, it is known that either excessive or poor secretion of sebum often causes skin troubles. There are many studies about the relationship between the sebum components and facial skin conditions, but little research exists considering seasonal changes. We investigated the relationships between sebum composition and lhcial skin conditions with seasonal changes. Our findings are as follows: 1) The quantity and ratio of sebum components varied during seasonal changes, and the range of variation depended on each subject. 2) The evaluated skin conditions varied with each subject. 3) Based on the comparison between sebum compositions and skin conditions in each subject, it was determined that dry skin improved along with the decrease of free fatty acid ratio in sebum, and that the corneocyte surface area increased along with the decrease of unsaturated saturated ratio in free fatty acid. Therefore, it was concluded that the amount of sebum and the compositional variation of free thtty acids had a relationship to skin conditions. 4) There were some subjects who specifically showed a high unsaturated saturated ratio in free fatty acids with low amounts of secreted sebum, and almost all of their skin conditions were classified as "sensitive skin." Based on the results, it is suggested that sebum composition may influence the skin sensitivity. Evaluation of Skin Surface Relief Using 3 D Analysis of Stereomicroscopic Images Naruhito Toyoda, Masakazu Fukuoka Institute of Beauty Sciences, Shisedo Co., Ltd. The stereoscopic recording/analyzing system for the skin surface image has been developed. Two sets of video camera with a magnifying lens are installed in the probe for recording the right and left images (area of 2.9x2.2mm) synchronously. The stereoscopic images can be recorded by a2 channel video cassette recorder. These images are synthesized on the screen and they are visible using a binocular stereo vision method. The system can replay the image of the skin surlhce with high fidelity, which is useful in cosmetic product tests for assisting researchers to evaluate the skin condition visually. The system can also measure topographic dimensions by an image processing method. The approximate diameters and depths of hair pores were obtained, in which the depth was calculated from the disparity between the right and left images with the use of trigonometry. The 3 D data were analyzed to grade the pore size and to categorize the skin for cosmetic counseling. Development of Care Products to Prevent Aged Body Odor 1 Yoko Gozu 2, Shinichiro Haze 2, Shoji Nakamura 2, Yoshiyuki Kohno 3, Hiroshi Fukui 2 Yoshimaru Kumano 2, Kiyohito Sawano 4, Hideaki Ohta 4, Kazuo Yamazaki 4 Shiseido Product Development Center 2, Shiseido Basic Research Center 3, Fragrance Division, Takasago International Co.4 We investigated the development of technique to cope with middle age body odor (ABO) by two suggested ways, 1) intercept the key component of ABO that is nonenal on the way of generation 2) using ABO masking able or variation able fragrance, match to the character of ABO. In the first way, we developed in vitro ABO generation system by coexistence of palmitoleic acid and squalenemonohydroperoxide. Thiotaurine, a prominent biomedical antioxidant, was sel•ected by this in vitro system for the ingredient to cut off the generation of nonenal. The using test of protocol product including thiotaurine was down the skin nonenal level and had an effect on suppression of ABO generation. Next, we developed the model ABO that general people considered the middle age body odor. We use the model ABO to test the fragrance efficacy of masking or variation. Based on this screening test, some effective fragrance was developed, and protocol product fragrant with that effective fragrance had the ability to prevent the odor of ABO in the using test. The application of technique we investigated shown the way for the product of cope with ABO. Development of a New Color Rendering Powder and Its Application to Base Make up Katsuki Ogawa, Osamu Sakurai, Setsuko Fuse, Kazuhisa Ohno, Sigenori Kumagai Shiseido Research Center I It is well known that a sintered pigment made from a mixture of titanium oxide and iron oxide by calcining at 700 or more shows photochromic characteristics. To develop a photochromic powder having new optical characteristics, we synthesized a composite powder made from the mixture of interference type pearly pigment and iron oxide (0.2 to 0.3wt) through sintering process at 900. The photochromic powder (hereinafter