
U103-C Filter
Materials:
Body: Aluminum(spray-painted)
Technical Specifications:
Working pressure:0.2Mpa
Filter accuracy:30um
Maximum flow rate:220L/min
Medium:gasoline,diesel
Features :
?92*82
M20*1.5
Package:
Product ID Net Weight Cross Weight Dimension
U103-C 18kg/case of35 19kg/case of35 50×28×35cm/case of35
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Zoology
On the one hand
Mar 23rd 2006
From The Economist print edition
Why some snails are left-handed
IN THE human world, the left-handed seem at quite a disadvantage. Indeed, a whole industry has sprung up to
supply this oppressed minority with everything from left-handed computer mice to mugs and boomerangs.
The world of snails, too, has its sinister minority. Hold a snail with the tip of its shell pointing upwards and the
opening towards you, and the shell will normally coil away to the right. Less commonly, it will coil to the left. Until
now, biologists have been at a loss to explain what advantage these rare reversals in shell-coiling offer. But
Gregory Dietl, of Yale University, and Jonathan Hendricks, at Cornell, think they know the answer.
Dr Dietl and Dr Hendricks, who have just published their results in Biology Letters, looked at the question by
examining fossil sea snails. They studied 1,722 specimens from six different species and found that right-handed
snails were far more likely than left-handers, on a per-snail basis, to show evidence of a lethal confrontation with a
crab. What they suspect is happening is that left-handed snails avoid the attentions of right-handed crabs because
these dexterous crustaceans find it tricky to eat lefties.
To appreciate this theory fully, you need to understand a little about crab table manners. Modern-day right-handed
crabs orient their prey with the shell pointing away from their body and the opening on the right-hand side. This
allows the crab to insert a large toothlike appendage on its right-hand claw into the opening, thus cracking the
snail s shell. The rest fuel dispenser of the shell is then rolled towards the tooth in an anticlockwise direction, in order to remove it.
The process is rather like peeling a potato with a right-handed peeler. Peeling in the other direction is awkward. fuel dispenser