Hf

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Hf,

symbol for the element hafniumhafnium
, metallic chemical element; symbol Hf; at. no. 72; at. wt. 178.49; m.p. about 2,227°C;; b.p. 4,602°C;; sp. gr. 13.31 at 20°C;; valence +4. Hafnium is a lustrous, ductile, silvery metal with a hexagonal, close-packed crystalline structure.
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Hf

(chemistry)
hafnium

HF

(communications)
high frequency
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

HF

On drawings, abbr. for “hot finished.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

HF

(High Frequency) A range of radio frequencies from 3 to 30 MHz. The HF band is used for amateur radio, marine, aviation and military communications and high-frequency RFID tags.

With regard to audio, high-frequency waves are typically above 3,000 Hz. See frequency bands.
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Cells were selected as [CD3.sup.+][CD4.sup.+] ([CD4.sup.+] T), [CD3.sup.+][CD8.sup.+] ([CD8.sup.+] T), [CD3.sup.+] [gamma][delta][TCR.sup.+] ([gamma][delta] T), [CD3.sup.+][NK1.1.sup.+] ([NK1.1.sup.+] T), and [CD3.sup.-][NK1.1.sup.+] (NK), and expression of gzmA and gzmB was analyzed in these populations.
To gain insight into the role of gzmA and gzmB in peritonitis and sepsis, we first sought to ascertain the expression of these gzms before and during E.
In PLF, the percentage of NK cells expressing gzmA clearly decreased over time, while the MFI (i.e., the amount of gzmA expressed by [gzmA.sup.+] NK cells) increased after infection (Figures 2(a) and 2(b)).
With the aim of evaluating whether gzmA and/or gzmB deficiency influences local bacterial outgrowth and subsequent dissemination, we determined bacterial loads in the PLF, blood, and liver and lung homogenates of WT, [gzmA.sup.-/-], [gzmB.sup.-/-], and [gzmAxB.sup.-/-] mice at predefined time points after infection (Figure 3).
Expression and Function of Granzymes A and B in Escherichia coli Peritonitis and Sepsis

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