holmium


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holmium

(hōl`mēəm) [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.93032; m.p. about 1,474°C;; b.p. about 2,425°C;; sp. gr. 8.78 at 25°C;; valence +3. Holmium is a soft, malleable, lustrous, silvery metal of the lanthanide serieslanthanide series,
a series of metallic elements, included in the rare-earth metals, in Group 3 of the periodic table. Members of the series are often called lanthanides, although lanthanum (atomic number 57) is not always considered a member of the series.
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 in Group 3 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
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. It is prepared by reduction of a holmium halide with calcium metal. Holmium is stable in dry air at room temperature but is rapidly oxidized in moist air or when heated. Holmia, the oxide, is found in nature, with other rare earthsrare earths,
in chemistry, oxides of the rare-earth metals. They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they were once thought to be very scarce.
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, in the minerals gadolinite and monazite. Holmium, its oxide, and its salts have no commercial uses. The metal was discovered spectroscopically in 1878 by the Swiss chemists Soret and Delafontaine and independently in 1879 by the Swedish chemist Per T. Cleve; it is named for Cleve's native city.

holmium

[′hōl·mē·əm]
(chemistry)
A rare-earth element belonging to the yttrium subgroup, symbol Ho, atomic number 67, atomic weight 164.9304, melting point 1400-1525°C.

holmium

a malleable silver-white metallic element of the lanthanide series. Symbol: Ho; atomic no.: 67; atomic wt.: 164.93032; valency: 3; relative density: 8.795; melting pt.: 1474°C; boiling pt.: 2700°C
References in periodicals archive ?
Prospective evaluation of the learning curve for holmium laser enucleation of the prostate.
Evaluation of holmium laser for managing mesh/suture complications of continence surgery.
Group-I###included 55 patients undergoing transurethral cystolithotripsy with holmium laser and simultaneous TURP using the 24F resectoscope and Group-II###consisted of 54 patients who used 22F cystoscope and 24F resectoscope for treating both these conditions.
Knight, who earlier performed 1,850 laser disc decompression procedures and 173 endoscopic laser disc decompression procedures, has performed 1,250 endoscopic laser foraminoplasty procedures with Trimedyne's Holmium lasers and proprietary side firing laser needles.
The first technique for holmium prostatectomy was the combination endoscopic laser ablation of the prostate (CELAP) (Gilling et al.
Once the stricture site was located, the holmium laser fibre (365 [micro]m) was introduced through a side channel of 17 Fr sheath and 0 degree scope.
The medically utilized holmium laser emits a pulsed beam of 2,100 um (nanometers) with a maximum power output of 60 watts.
Together we will provide urologic surgeons worldwide access to the latest Holmium laser technologies that can result in a significant, positive impact on kidney stone treatment.
Holmium laser transurethral incision of the prostate: Can prostate size predict the long-term outcome?
Boston Scientific and Lumenis currently market Lumenis' angled firing laser fibers for use with Lumenis' Holmium lasers to treat BPH (with fiber royalty payments made to Trimedyne), in competition with Laserscope, Inc.
3mm, length 403mm, for the Ultrasound hand piece compatible for EMS Lithoclast Master,Laser fibers (reusable) with SMA connector compatible with 30W Holmium :Yag Surgical Laser System Model,150 micron reusable fibers compatible with 30W Holmium :Yag Surgical Laser System Model,200 micron reusable fibers compatible with 30W Holmium :Yag Surgical Laser System Model,365micron reusable fibers compatible with 30W Holmium :Yag Surgical Laser System Model :Auriga Qi.
These patients were treated with transurethral holmium laser vaporization to urethral tumour and transurethral resection and degeneration of the bladder tumour (TURD-Bt).