Suntan Health Dictionary

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Suntan: From 1 Different Sources

Darkening of the skin after exposure to sunlight.

Specialized cells in the epidermis respond to ultraviolet light by producing the pigment melanin.

(See also sunlight, adverse effects of; sunburn.)

Health Source: BMA Medical Dictionary
Author: The British Medical Association

Arc Eye

Damage to the corneal surface of the EYE caused by ultraviolet light from arc welding. A painful condition, it usually heals if the eyes are covered with pads for a day or two. It can be prevented by the proper use of protective goggles. A similar condition occurs in snow-blindness or when someone fails to protect the eyes when using suntan lamps.... arc eye

Cyperus Rotundus

Linn.

Family: Cyperaceae.

Habitat: Throughout India, as a weed upto 2,000 m.

English: Nut Grass.

Ayurvedic: Musta, Mustaa, Mus- taka, Abda, Ambuda, Ambhoda, Ambodhara, Bhadra, Bhadraa, Bhadramusta, Bhadramustaa, Bhadramustaka, Ghana, Jalada, Jaldhara, Meghaahvaa, Nirada, Vaarida, Vaarivaaha, Payoda, Balaahaka. Ganda-Duurvaa (var.).

Unani: Naagarmothaa, Saad-e-Kufi.

Siddha/Tamil: Koraikkizhangu.

Folk: Mothaa.

Action: Carminative, astringent, anti-inflammatory, antirheumat- ic, hepatoprotective, diuretic, antipyretic, analgesic, hypoten- sive, emmenagogue and nervine tonic.

Used for intestinal problems, indigestion, sprue, diarrhoea, dysentery, vomiting and fever; also as a hypoc- holesterolaemic drug and in obesity.

Along with other therapeutic applications, The Ayurvedic Pharmacopoeia of India indicated the use of the rhizome in rheumatism, inflammations, dysuria, puerperal diseases and obesity.

The tuber is rich in Cu, Fe, Mg and Ni. Beta-sitosterol, isolated from the tubers, exhibits significant anti- inflammatory activity against carra- geenan- and cotton pellet-induced oedema in rats; the activity is comparable to hydrocortisone and phenylbutazone when administered intraperi- toneally.

The alcoholic and aqueous extracts of the tubers possess lipolytic action and reduce obesity by releasing enhanced concentrations of biogenic amines from nerve terminals of the brain which suppress the appetite centre. Presence of eudalne group of ses- quiterpenic compounds of sesquiter- pene alcohol, isocyperol is said to play an important role in lipid metabolism.

An alcoholic extract of the plant exhibits liver-protective activity against CCL4-induced liver damage in mice.

Methanolic extract of the plant stimulates the production of melanin in cultured melanocytes. (Plant extract is used in preparations used for pigmentation of skin and hair, also in suntan gels.) Aqueous-alcoholic extract of the tuber exhibited hypotensive, diuretic, antipyretic and analgesic activities. These are attributed to a triterpenoid.

The essential oil (0.5-0.9%) from the tubers contains mainly sesquiterpenes.

C. platystilis Br. is equated with Kaivarta-mustaka.

Dosage: Rhizome—3-6 g powder; 20-30 ml decoction. (API Vol. III.)... cyperus rotundus

Pityriasis

A skin disorder typi?ed by a bran-like desquamation (?aking). There are several varieties including P. alba, rosea, versicolor (fungal caused) and rubra (exfoliative dermatitis).

Pityriasis alba is a mild form of chronic eczema (see DERMATITIS) occurring mainly in children on the face and in young adults on the upper arms. It is characterised by round or oval ?aky patches which are paler than the surrounding skin due to partial loss of MELANIN pigment. The appearance is more dramatic in dark-skinned or suntanned subjects. Moisturising cream often su?ces, but 1 per cent HYDROCORTISONE cream is more e?ective.

Pityriasis rosea is a common self-limiting eruption seen mainly in young adults. It usually begins as a solitary red ?aky patch (often misdiagnosed as ringworm). Within a week this ‘herald patch’ is followed by a profuse symmetrical eruption of smaller rose-pink, ?aky, oval lesions on the trunk and neck but largely sparing the limbs and face. Itching is variable. The eruption usually peaks within 3 weeks and fades away leaving collarettes of scale, disappearing within 6–7 weeks. It rarely recurs and a viral cause is suspected but not proved. It is not contagious and there is no speci?c treatment, but crotamiton cream (Eurax) may relieve discomfort.... pityriasis

Jojoba

Peanut of the desert. Simmondsia chinensis. Part used: nut-bean. An animal fat (wax) substitute. Contains myristic acid. Once an important medicinal fruit among Southern Arizona Indians. Action: anti-oxidant, emollient, digestant, anti-inflammatory, detergent, anti-foaming agent, vulnerary for cuts and injuries, appetite-depressant, helps restore pH balance, tuberculostatic. The oil is not readily broken-down by the digestive juices, thus it more directly benefits the intestines.

Uses: Used by the native population for indigestion from a ‘cold’ stomach, for wounds that refuse to heal, and by the squaws for painless delivery. Internally, said to inhibit the spread of tuberculosis.

External: Mexican men still apply the oil to their eye-brows and hair for growth while their women use it to dress their braids and tresses. To the scalp the oil removes excess sebum, moistens dry skin and expels dandruff. Used for minor skin disorders, acne, sunburn, minor burns, chapped skin, nappy-rash, soft fingernails and facial blemishes.

Preparations: Nuts – eaten freely by Mexicans, their children and farm animals. Roasted to make coffee. Meal left over after oil extraction contains no less than 17 amino acids. With its 35 per cent protein Jojoba is a valuable nutrient. Oil is obtained from Mexican beans by cold pressing to ensure that properties provided by nature are not destroyed by chemical processing. It has now replaced some animal oils, especially whale oil (spermaceti) as a base for ointments, creams, bath oils, suntan lotions, and other cosmetic preparations. So successful it is as a substitute for whale oil that the sperm whale now has a new lease of life. It is both non-toxic and non-allergenic. May substitute Olive oil in salads. ... jojoba

Tan

See suntan.... tan

Ultraviolet Rays

invisible short-wavelength radiation beyond the violet end of the visible spectrum. Sunlight contains ultraviolet rays, which are responsible for the production of both suntan and – on overexposure – *sunburn. The dust and gases of the earth’s atmosphere absorb most of the ultraviolet radiation in sunlight (see ozone). If this did not happen, the intense ultraviolet radiation from the sun would be lethal to living organisms.... ultraviolet rays

Greater Ammi

Ammi majus

Apiaceae

Importance: Greater Ammi, also known as Bishop’s weed or Honey plant is an annual or biennial herb which is extensively used in the treatment of leucoderma (vitiligo) and psoriasis. The compounds responsible for this are reported to be furocoumarins like ammoidin (xanthotoxin), ammidin (imperatorin) and majudin (bergapten) present in the seed. Xanthotoxin is marketed under the trade name “Ox soralen” which is administered orally in doses of 50 mg t.d. or applied externally as 1% liniment followed by exposure of affected areas to sunlight or UV light for 2 hours. It is also used in “Suntan lotion”. Meladinine is a by-product of Ammi majus processing, containing both xanthotoxin and imperatorin sold in various formulations increases pigmentation of normal skin and induces repigmentation in vitiligo. Imperatorin has antitumour activity. Fruit or seed causes photosensitization in fouls and sheep.

Distribution: The plant is indigenous to Egypt and it grows in the Nile Valley, especially in Behira and Fayoom. It is also found in the basin of the Mediterranean Sea, in Syria, Palestine, Abyssinia, West Africa, in some regions of Iran and the mountains of Kohaz (Ramadan, 1982). It grows wild in the wild state in Abbottabad, Mainwali, Mahran and is cultivated in Pakistan. The crop was introduced to India in the Forest Research Institute, Dehra Dun, in 1955 through the courtesy of UNESCO. Since then, the crop has been grown for its medicinal fruit in several places in Uttar Pradesh, Gujarat, Kashmir and Tamil Nadu.

Botany: Ammi majus Linn. belongs to the family Apiaceae (Umbelliferae). A. visnaga is another related species of medicinal importance. A. majus is an annual or beinnial herb growing to a height of 80 to 120 cm. It has a long tap root, solid erect stem, decompound leaves, light green alternate, variously pinnately divided, having lanceolate to oval segments. Inflorescence is axillary and terminal compound umbels with white flowers. The fruits are ribbed, ellipsoid, green to greenish brown when immature, turning reddish brown at maturity and having a characteristic terebinthinate odour becoming strong on crushing with extremely pungent and slightly bitter taste.

Agrotechnology: Ammi is relatively cold loving and it comes up well under subtropical and temperate conditions. It does not prefer heavy rainfall. Though the plant is biennial it behaves as an annual under cultivation in India. A mild cool climate in the early stages of crop growth and a warm dry weather at maturity is ideal. It is cultivated as a winter annual crop in rabi season. A wide variety of soils from sandy loam to clay loam are suitable. However, a well drained loamy soil is the best. Waterlogged soils are not good. Being a hardy crop, it thrives on poor and degraded soils.

The plant is seed propagated. Seeds germinate within 10-12 days of sowing. The best time of sowing is October and the crop duration is 160-170 days in north India. Crop sown later gives lower yield. The crop can be raised either by direct sowing of seed or by raising a nursery and then transplanting the crop. Seed rate is 2 kg/ha. The land is brought to a fine tilth by repeated ploughing and harrowing. Ridges and furrows are then formed at 45-60 cm spacing. Well decomposed FYM at 10-15 t/ha and basal fertilisers are incorporated in the furrows. Seeds being very small are mixed with fine sand or soil, sown in furrows and covered lightly with a thin layer of soil. A fertilizer dose of 80:30:30 kg N, P2O5 and K2O/ha is generally recommended for the crop while 150:40:40 kg/ha is suggested in poor soils for better yields. The furocoumarin content of Ammi majus is increased by N fertiliser and the N use efficiency increases with split application of N at sowing, branching and at flowering. For obtaining high yields it is essential to give one or two hoeings during November to February which keeps down the weeds. If winter rains fail, one irrigation is essential during November to January. As the harvesting season is spread over a long period of time, two irrigations during March and April meets the requirements of the crop (Chadha and Gupta, 1995).

White ants and cut worms are reported to attack the crop which can be controlled by spraying the crop with 40g carbaryl in 10 l of water. Damping off and powdery mildew are the common diseases of the crop. Seed treatment with organomercuric compounds is recommended for damping off. To control powdery mildew the crop is to be sprayed with 30g wettable sulphur in 10 l of water whenever noticed.

The crop flowers in February. Flowering and maturity of seed is spread over a long period of two months. The primary umbels and the early maturing secondary umbels are the major contributors to yield. A little delay in harvesting results in the shattering of the seed which is the main constraint in the commercial cultivation of the crop and the main reason for low yields in India. Sobti et al (1978) have reported increased yield by 50 - 60% by the application of planofix at 5 ppm at flower initiation and fruit formation stages. The optimum time of harvest is the mature green stage of the fruit in view of the reduced losses due to shattering and maximum contents of furocoumarins. The primary umbels mature first within 35-45 days. These are harvested at an interval of 2-4 days. Later, the early appearing secondary umbels are harvested. Afterwards, the entire crop is harvested, stored for a couple of days and then threshed to separate the seeds. The seed yield is 900-1200 kg/ha.

Postharvest technology: The processing of seed involves solvent extraction of powdered seeds, followed by chilling and liquid extraction and chromatographic separation after treatment with alcoholic HCl. Bergapten, xanthotoxin and xanthotoxol can be separated. Xanthotoxol can be methylated and the total xanthotoxin can be purified by charcoal treatment in acetone or alcohol.

Properties and activity: Ammi majus fruit contains amorphous glucoside 1%, tannin 0.45%, oleoresin 4.76%, acrid oil 3.2%, fixed oil 12.92%, proteins 13.83% and cellulose 22.4%. This is one of the richest sources of linear furocoumarins. Ivie (1978) evaluated the furocoumarin chemistry of taxa Ammi majus and reported the presence of xanthotoxin, bergapten, imperatorin, oxypencedanin, heraclenin, sexalin, pabulenol and many other compounds. Furocoumarins have bactericidal, fungicidal, insecticidal, larvicidal, moluscicidal, nematicidal, ovicidal, viricidal and herbicidal activities (Duke, 1988).... greater ammi

Melanin

Pigment which confers colour on the SKIN, hair and EYE. It is produced by cells called melanocytes interspersed along the basal layer of the EPIDERMIS. The maturation of the epidermis into stratum corneum cells packed with melanin granules confers an ultraviolet light barrier which protects the skin against the harmful effects resulting from continued solar exposure. The races do not di?er in the number of melanocytes in their skin, only in the rate and quantity of melanin production. Exposure to bright sunlight stimulates melanin production and distribution causing ‘suntan’. A hormone from the PITUITARY GLAND may stimulate melanin production on the face in pregnancy (see CHLOASMA).... melanin

Bergamot

Citrus bergamia

FAMILY: Rutaceae

SYNONYM: Citrus aurantium subsp. bergamia.

GENERAL DESCRIPTION: A small tree, about 4.5 metres high with smooth oval leaves, bearing small round fruit which ripen from green to yellow, much like a miniature orange in appearance.

DISTRIBUTION: Native to tropical Asia. Extensively cultivated in Calabria in southern Italy and also grown commercially on the Ivory Coast.

OTHER SPECIES: Not to be confused with the herb bergamot or bee balm (Monarda didyma).

HERBAL/FOLK TRADITION: Named after the Italian city of Bergamo in Lombardy, where the oil was first sold. The oil has been used in Italian folk medicine for many years, primarily for fever (including malaria) and worms; it does not feature in the folk tradition of any other countries. However, due to recent research in Italy, bergamot oil is now known to have a wide spectrum of applications, being particularly useful for mouth, skin, respiratory and urinary tract infections.

ACTIONS: Analgesic, anthelmintic, antidepressant, antiseptic (pulmonary, genito-urinary), antispasmodic, antitoxic, carminative, digestive, diuretic, deodorant, febrifuge, laxative, parasiticide, rubefacient, stimulant, stomachic, tonic, vermifuge, vulnerary.

EXTRACTION: Essential oil by cold expression of the peel of the nearly ripe fruit. (A rectified or terpeneless oil is produced by vacuum distillation or solvent extraction.)

CHARACTERISTICS: A light greenish-yellow liquid with a fresh sweet-fruity, slightly spicy-balsamic undertone. On ageing it turns a brownish-olive colour. It blends well with lavender, neroli, jasmine, cypress, geranium, lemon, chamomile, juniper, coriander and violet.

PRINCIPAL CONSTTTUENTS Known to have about 300 compounds present in the expressed oil: mainly linalyl acetate (30–60 per cent), linalol (11–22 per cent) and other alcohols, sesquiterpenes, terpenes, alkanes and furocoumarins (including bergapten, 0.30–0.39 per cent).

SAFETY DATA: Certain furocoumarins, notably bergapten, have been found to be phototoxic on human skin; that is, they cause sensitization and skin pigmentation when exposed to direct sunlight (in concentration and in dilution even after some time!). Extreme care must be taken when using the oil in dermal applications – otherwise a rectified or ‘bergapten-free’ oil should be substituted. Available information indicates it to be otherwise non-toxic and relatively non-irritant.

AROMATHERAPY/HOME: USE

Skin Care: Acne, boils, cold sores, eczema, insect repellent and insect bites, oily complexion, psoriasis, scabies, spots, varicose ulcers, wounds.

Respiratory System: Halitosis, mouth infections, sore throat, tonsillitis.

Digestive System: Flatulence, loss of appetite.

Genito-URINARY SYSTEM: Cystitis, leucorrhoea, pruritis, thrush.

Immune System: Colds, fever, ’flu, infectious diseases.

Nervous System: Anxiety, depression and stress-related conditions, having a refreshing and uplifting quality.

OTHER USES: Extensively used as a fragrance and, to a degree, a fixative in cosmetics, toiletries, suntan lotions and perfumes – it is a classic ingredient of eau-de-cologne. Widely used in most major food categories and beverages, notably Earl Grey tea.... bergamot


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