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Blue Lettuce

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Botanical Name : Lactuca pulchella
Family :Asteraceae – Aster family
Genus: Lactuca L. – lettuce
Species: Lactuca tatarica (L.) C.A. Mey. – blue lettuce
Variety:Lactuca tatarica (L.) C.A. Mey. var. pulchella (Pursh) Breitung – blue lettuce
Kingdom :Plantae – Plants
Subkingdom: Tracheobionta – Vascular plants
Superdivision: Spermatophyta – Seed plants
Division: Magnoliophyta – Flowering plants
Class: Magnoliopsida – Dicotyledons
Subclass: Asteridae
Order: Asterales

Synonyms:
*Lactuca tatarica (Linnaeus) C.A. Meyer subsp. pulchella (Pursh) A.P. de Candolle
*Mulgedium pulchellum (Pursh) G. Don
*Sonchus pulchellus Pursh

Common Name : Blue Lettuce,Chicory Lettuce

Habitat:
In Michigan this species is native only to Isle Royale, where it occurs in rocky openings on ridges. It is adventive elsewhere in the state. In other portions of its range, this species inhabits moist prairies, meadows, clearings, and riverbanks. The Isle Royale populations have not been collected since 1930.

Description:
General: plant with milky sap, 20-100 cm tall.
Growth habit: perennial from white, deep-seated, creeping root, often growing in patches.
Stems: erect, hairless or almost so.
Leaves: alternate, narrowly lance-shaped, 5-18 cm
long and 6-35 mm wide, entire, or the lower ones more or
less with triangular, backward-pointig lobes or sharply
toothed, often with waxy coating beneath.
Flowerheads: blue, showy, about 2 cm wide, with
18-50 ray florets only, several in open clusters. Involucre
15-20 mm high in fruit, with overlapping bracts in 3 rows.
Flowering time: June-September.
Fruits: achenes, 4-7 mm long, the slender body
moderately compressed, prominently several-nerved on
each face, the beak stout, often whitish, equaling or less
than half as long as the body. Pappus of white, hair-like
bristles.
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Cultivation:
Prefers a light sandy loam. This species is considered to be a noxious weed in N. America where it spreads freely by suckers in cultivated ground – even a small portion of the root can regenerate to form a new plant.

Propagation:
Seed – sow April in a greenhouse, only just covering the seed. Germination is usually fairly quick. Prick out the seedlings into individual pots when large enough to handle and plant them out in the summer. Division in spring. Root cuttings in spring.

Edible uses:
Young leaves – raw or cooked – of blue lettuce have been eaten by Native tribes. A gum obtained from the roots is used for chewing. However, caution should be used, because of the mild narcotic properties of the plant.

Medicinal Uses:
A tea of the roots and stems has been used by the Okanagan-Colville Indians of British Columbia in the treatment of diarrhea in children. Hemorrhoids have been treated by applying a moist, usually warm or hot mass of plant material. The whole plant is rich in a milky sap, containing ‘lactucarium’, which is used in medicine for its mildly pain-relieving, antispasmodic, digestive, urination-inducing, hypnotic, narcotic and sedative properties. Lactucarium has mild narcotic effects. It has been taken internally in the treatment of insomnia, anxiety, neuroses, hyperactivity in children, dry coughs, whooping cough, rheumatic pain etc. The sap has also been applied externally in the treatment of warts. An infusion of the roots and stems has been given to children in the treatment of diarrhea. The sap has also been applied externally in the treatment of warts.

Other Uses: The Gum has several uses.

Precautions:
The plant should be used with caution, and never without the supervision of a skilled practitioner. Even normal doses can cause drowsiness, excess causes restlessness and overdoses can cause death through cardiac paralysis.

Disclaimer:
The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider.

Resources:
http://montana.plant-life.org/species/lactuca_tatari.htm
http://web4.msue.msu.edu/mnfi/explorer/species.cfm?id=13578
http://plants.usda.gov/java/profile?symbol=LATAP
http://www.herbnet.com/Herb%20Uses_AB.htm
http://www.wnmu.edu/academic/nspages/gilaflora/lactuca_pulchella.html

http://www.wildstaudenzauber.de/Seiten/Praerie.html

http://www.fromoldbooks.org/Fletcher-FarmWeeds/pages/033-Blue-lettuce/411×764-q75.html

http://www.pfaf.org/user/Plant.aspx?LatinName=Lactuca+pulchella

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How Light Sensors in Eye Work

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Neuro-scientists have unravelled how newly discovered light sensors in the eye detect light and communicate with the brain.
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These light sensors are a small number of nerve cells in the retina that contain melanopsin molecules.

Unlike conventional light-sensing cells in the retina-rods and cones, melanopsin-containing cells are not used for seeing images.

Instead, they monitor light levels to adjust the body’s clock and control constriction of the pupils in the eye, among other functions.

“These melanopsin-containing cells are the only other known photoreceptor besides rods and cones in mammals, and the question is, how do they work,” said Michael Do, a postdoctoral fellow in neuro-science at Johns Hopkins.

“We want to understand some fundamental information, like their sensitivity to light and their communication to the brain,” he informed.

Using mice, the team first tested the light sensitivity of these cells by flashing light at the cells and recording the electrical current generated by one cell.

They found that these cells are very insensitive to light, in contrast to rods, which are very sensitive and therefore enable us to see in dim light at night, for example.

According to Do, the melanopsin-containing cells are less sensitive than cones, which are responsible for our vision in daylight.

“The next question was, what makes them so insensitive to light? Perhaps each photon they capture elicits a tiny electrical signal. Then there would have to be bright light-giving lots of captured photons for a signal large enough to influence the brain. Another possibility is that these cells capture photons poorly,” said Do.

To figure this out, the team flashed dim light at the cells. The light was so dim that, on average, only a single melanopsin molecule in each cell was activated by capturing a photon.

They found that each activated melanopsin molecule triggered a large electrical signal. Moreover, to their surprise, the cell transmits this single-photon signal all the way to the brain, said a Johns Hopkins release.

Yet the large signal generated by these cells seemed incongruous with their need for such bright light. “We thought maybe they need so much light because each cell might also contain very few melanopsin molecules, decreasing their ability to capture photons,” said King-Wai Yau, a professor of neuroscience at Hopkins.

When they did the calculations, the research team found that melanopsin molecules are 5,000 times sparser than other light-capturing molecules used for image-forming vision.

“It appears that these cells capture very little light. However, once captured, the light is very effective in producing a signal large enough to go straight to the brain,” said Yau.

Sources: The Telegraph (Kolkata, India)

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Featured Healthy Tips

Broccoli ‘May Help Protect Lungs’

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A substance found in broccoli may limit the damage which leads to serious lung disease, research suggests.
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Sulforapane is found in broccoli and brussel sprouts

Chronic obstructive pulmonary disease (COPD) is often caused by smoking and kills about 30,000 UK residents a year.

US scientists found that sulforapane increases the activity of the NRF2 gene in human lung cells which protects cells from damage caused by toxins.

The same broccoli compound was recently found to be protective against damage to blood vessels caused by diabetes.

Brassica vegetables such as broccoli have also been linked to a lower risk of heart attacks and strokes.

Cell pollutants

In the latest study, a team from Johns Hopkins School of Medicine found significantly lower activity of the NRF2 gene in smokers with advanced COPD.

Writing in the American Journal of Respiratory and Critical Care Medicine, they said the gene is responsible for turning on several mechanisms for removing toxins and pollutants which can damage cells.

“We know broccoli naturally contains important compounds but studies so far have taken place in the test tube and further research is needed to find if you can produce the same effect in humans” :-Spokeswoman, British Lung Foundation

Previous studies in mice had shown that disrupting the NRF2 gene caused early onset severe emphysema – one of the conditions suffered by COPD patients.

Increasing the activity of NRF2 may lead to useful treatments for preventing the progression of COPD, the researchers said.

In the study, they showed that sulforapane was able to restore reduced levels of NRF2 in cells exposed to cigarette smoke.

“Future studies should target NRF2 as a novel strategy to increase antioxidant protection in the lungs and test its ability to improve lung function in people with COPD,” said study leader Dr Shyam Biswal.

A spokeswoman for the British Lung Foundation said: “This is an important study for the 3 million people in the UK with COPD because of its findings about the imbalance of oxidants and antioxidants in the lungs.

“We know broccoli naturally contains important compounds but studies so far have taken place in the test tube and further research is needed to find if you can produce the same effect in humans.

Sources:BBC NEWS:Sept 12. ’08

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