Sentences with phrase «in xylem»

I have closed out my positions in Xylem and ITT (2 of the 3 ITT spinoff companies) to raise some cash.

In this brief paper, Todd Ahlsten, CIO, discusses water shortages and quality issues, and explains why the Parnassus investment team has invested in Xylem and Pentair, two companies that sell products designed to more efficiently manage water.

Scanning electron micrograph of the bacterium Xylella fastidiosa, causal agent of the citrus variegated chlorosis, present in the xylem vessel of infected sweet orange leaf (ca.

Water molecules in the xylem, I innocently explained, are linked by bonds that form among their positively and negatively charged poles.

Also, I had been told repeatedly that the water in xylem tubes is under tension — which sounded like pulling, not pushing, to me.

As the contents leak out, they percolate through the youngest vessels, or «pipes», in the xylem, the tree's internal plumbing system.

Such is the case in the xylem tubes of trees.

When water is scarce, the trees have to pull much harder on the water in the xylem, which allows air bubbles to infiltrate the pipes.

The pores also limit cavitation, a process by which air bubbles can grow and spread in xylem, eventually killing a tree.

Typically, when plants become extremely dehydrated and water pressure drops, air bubbles can develop in the xylem, tissue that carries water up from the roots (SN: 05/14/16, p. 32).

[The bacterium] lives in the xylem, so an infected tree could have a healthy limb, and if we test the wrong one, we may allow the tree to live and continue to be a host.

Water and other materials necessary for biological activity in trees are transported throughout the stem and branches in thin, hollow tubes in the xylem, or wood tissue.

Not exact matches

By Martin Kunz, EMEA Segment Leader, Industry with Xylem's Applied Water Systems business Only 2.5 percent of the world's water is fresh water, and of that, only one percent is accessible as much is trapped in glaciers and snowfields.

In the lab, they studied plant xylem vessels — xylem cells make the tubes that transport water from the roots to the top of a tree.

At some point during this struggle, air bubbles can be pulled up into the xylem causing embolisms (analogous to those to those that form in the human vascular system).

In a coastal redwood, though, the xylem is mostly made up of tracheids that move water slowly to the top of the tree.

The trees make use of an abundance of living cells around their xylem to conserve and redistribute water in drought conditions.

Like the vascular system in people, the xylem and phloem tissues extend throughout the plant.

Xylem tissue is found in all growth rings (wood) of the tree.

Each typical xylem vessel may only be several microns in diameter.

In contrast, the xylem of conifers consists of enclosed cells called tracheids.

«Tropical trees, compared those in temperate forests, have three times as many living cells surrounding the xylem that can facilitate these processes, which are not observed by the typical experiments we conduct to determine how vulnerable a plant is to droughts.»

This unique situation comes about because the xylem tissue in oaks has very large vessels; they can carry a lot of water quickly, but can also be easily disrupted by freezing and air pockets.

There are major differences between hardwoods (oak, ash, maple) and conifers (redwood, pine, spruce, fir) in the structure of xylem.

Because of the narrow diameter of the xylem tubing, the degree of water tension, (vacuum) required to drive water up through the xylem can be easily attained through normal transpiration rates that often occur in leaves.»

But in cladoxylopsids, «each strand of xylem had its own growth rings,» says paleobotanist Christopher M. Berry of Cardiff University in Wales, who co-authored the study with colleagues at the Chinese Academy of Sciences in Nanjing and Binghamton University, S.U.N.Y.

Designers interested in using sapwood as a filtering material will also have to find ways to keep the wood damp, or to dry it while retaining the xylem function.

The xylem's tiny pores can trap bubbles, preventing them from spreading in the wood.

Published online this week in the Proceedings of the National Academy of Sciences, the study found that the species most resistant to drought are those that are better at withstanding stress to the water transport system — composed of internal pipes known as xylem — that carries water from the roots to the crown.

A false - color electron microscope image showing E. coli bacteria (green) trapped over xylem pit membranes (red and blue) in the sapwood after filtration.

They say the size of the pores in sapwood — which contains xylem tissue evolved to transport sap up the length of a tree — also allows water through while blocking most types of bacteria.

Fossilized slices of a 374 - million - year - old tree reveal a hollow core surrounded by numerous bundles of woody strands called xylem (the larger black spots), with soft tissue (in gray) between.

New xylem grow in rings at the periphery of the trunk just behind the bark, adding girth so the tree can get taller.

But it also split apart the tree's xylem skeleton, which required the tree to continually repair itself, the team reports today in the Proceedings of the National Academy of Sciences.

The researchers focused on the secondary cell walls in a type of plant tissue called xylem from the Arabidopsis plant's roots.

In the largest of the two fossil trunks, above the bulge, the xylem and soft tissue occupied a ring about 50 centimeters in diameter and 5 centimeters thick, with external roots making up the remainder of the 70 - centimeter - diameter tree trunIn the largest of the two fossil trunks, above the bulge, the xylem and soft tissue occupied a ring about 50 centimeters in diameter and 5 centimeters thick, with external roots making up the remainder of the 70 - centimeter - diameter tree trunin diameter and 5 centimeters thick, with external roots making up the remainder of the 70 - centimeter - diameter tree trunk.

«We investigated whether coiling wire around the lower part of the plant stems to reduce the capacity of xylem to transport water to the shoot would result in low shoot moisture conditions and increase the sugar concentration of fruit like salt and water stresses,» the authors said.

In other trees, notably palms, xylem is formed in strands embedded in softer tissues throughout the trunIn other trees, notably palms, xylem is formed in strands embedded in softer tissues throughout the trunin strands embedded in softer tissues throughout the trunin softer tissues throughout the trunk.

Massive, exceptionally well - preserved cladoxylopsid tree trunks found in Xinjiang, China, have revealed an interconnected web of woody strands (xylem)...

Morphologically, the DZ in the wild type (WT) is marked by the appearance of epidermal root hairs on the external surface of outer cell files (trichoblast) and the existence of fully differentiated xylem for internal cell files (Dolan et al, 1993; Ishikawa & Evans, 1995; Beemster et al, 2003; Verbelen et al, 2006; Zhang et al, 2010; Mähönen et al, 2014).

The breakup, structured as a spin - off of two companies, Xylem (XYL) and Exelis (XLS), was announced in the 1st Quarter of 2011 and consummated this past October 31.

Of the three companies coming out of the ITT spinoffs (Xylem, Exelis and the ITT stub) I decided to focus my attention on Exelis in the weeks after the spinoff; it was the company who's shares traded down the most post spin and seemed the most undervalued.

Plants transport water in pipe - like structures made of dead and empty cells within a vascular tissue called xylem.

Samuelson et al. -LRB-[2004]-RRB- showed a lag effect in the response of foliage to large changes in precipitation by correlating current growth of loblolly pine (Pinus taeda) with the previous year's LAI, and Sperry et al. -LRB-[2002]-RRB- explained how combinations of soil texture and xylem can impose «hydraulic limits» on the ability of the foliage to maintain adequate pressure potentials to support a continuous water column.

During late April, the xylem of a healthy tree transported water at a rate of 320 cm3 day − 1 cm − 2, compared with 228 and 100 cm3 day − 1 cm − 2 in M and S trees, respectively.

Latin name: Pseudotsuga menziesii A close - up photo of tree rings in Douglas - fir reveals the individual wood cells that make up the xylem.