Halogens
Curing Lights, Dental
Bromine
Light-Curing of Dental Adhesives
Dental Equipment
Chlorine
Resin Cements
Materials Testing
Lewis Bases
Adhesives
Hardness
Laminaria
Orthodontic Brackets
Technology, Dental
Polymerization
Tooth Bleaching
Glare
Phosphoric Acids
Dental Debonding
Tooth Abrasion
Lighting
Polyurethanes
Dental Bonding
Semiconductors
Bisphenol A-Glycidyl Methacrylate
Bromides
Disinfectants
Dental Clasps
Dental Disinfectants
Bacteria
Disinfection
Evidence that halogenated furanones from Delisea pulchra inhibit acylated homoserine lactone (AHL)-mediated gene expression by displacing the AHL signal from its receptor protein. (1/259)
Acylated homoserine lactone (AHL)-mediated gene expression controls phenotypes involved in colonization, often specifically of higher organisms, in both marine and terrestrial environments. The marine red alga Delisea pulchra produces halogenated furanones which resemble AHLs structurally and show inhibitory activity at ecologically realistic concentrations in AHL bioassays. Evidence is presented that halogenated furanones displace tritiated OHHL [N-3-(oxohexanoyl)-L-homoserine lactone] from Escherichia coli cells overproducing LuxR with potencies corresponding to their respective inhibitory activities in an AHL-regulated bioluminescence assay, indicating that this is the mechanism by which furanones inhibit AHL-dependent phenotypes. Alternative mechanisms for this phenomenon are also addressed. General metabolic disruption was assessed with two-dimensional PAGE, revealing limited non-AHL-related effects. A direct chemical interaction between the algal compounds and AHLs, as monitored by 1H NMR spectroscopy, was shown not to occur in vitro. These results support the contention that furanones, at the concentrations produced by the alga, can control bacterial colonization of surfaces by specifically interfering with AHL-mediated gene expression at the level of the LuxR protein. (+info)Degradation of 1,2-dibromoethane by Mycobacterium sp. strain GP1. (2/259)
The newly isolated bacterial strain GP1 can utilize 1, 2-dibromoethane as the sole carbon and energy source. On the basis of 16S rRNA gene sequence analysis, the organism was identified as a member of the subgroup which contains the fast-growing mycobacteria. The first step in 1,2-dibromoethane metabolism is catalyzed by a hydrolytic haloalkane dehalogenase. The resulting 2-bromoethanol is rapidly converted to ethylene oxide by a haloalcohol dehalogenase, in this way preventing the accumulation of 2-bromoethanol and 2-bromoacetaldehyde as toxic intermediates. Ethylene oxide can serve as a growth substrate for strain GP1, but the pathway(s) by which it is further metabolized is still unclear. Strain GP1 can also utilize 1-chloropropane, 1-bromopropane, 2-bromoethanol, and 2-chloroethanol as growth substrates. 2-Chloroethanol and 2-bromoethanol are metabolized via ethylene oxide, which for both haloalcohols is a novel way to remove the halide without going through the corresponding acetaldehyde intermediate. The haloalkane dehalogenase gene was cloned and sequenced. The dehalogenase (DhaAf) encoded by this gene is identical to the haloalkane dehalogenase (DhaA) of Rhodococcus rhodochrous NCIMB 13064, except for three amino acid substitutions and a 14-amino-acid extension at the C terminus. Alignments of the complete dehalogenase gene region of strain GP1 with DNA sequences in different databases showed that a large part of a dhaA gene region, which is also present in R. rhodochrous NCIMB 13064, was fused to a fragment of a haloalcohol dehalogenase gene that was identical to the last 42 nucleotides of the hheB gene found in Corynebacterium sp. strain N-1074. (+info)Renal angiotensin I-converting enzyme as a mixture of sialo- and asialo-enzyme, and a rapid purification method. (3/259)
Angiotensin I-converting enzyme [EC 3.4.15.1] was rapidly and highly purified from a particulate fraction of hog kidney cortex with 13% yield. The procedure, which was rapid, included fractionation on DEAE-cellulose and calcium phosphate gel, chromatographies on DEAE-Sephadex A-50 and hydroxylapatite columns, and gel filtration on a Sephadex G-200 column. The purified enzyme preparation gave two protein bands on standard disc gel electrophoresis, but showed a single protein component on the gel after treatment with neuraminidase [EC 3.2.1.18]. The data strongly suggest that the purified enzyme preparation was a mixture of sialo- and asialo-enzyme. Sialic acid residues apparently do not contribute to the catalytic activity of the enzyme. The enzyme was activated more by chloride ions than by other halide ions tested, using Bz-Gly-Gly-Gly as a substrate. The dissociation constant for chloride ions was determined to be 2.2 mM. Chloride did not protect the enzyme against heat or low pH. The enzyme was resistant to inactivation by trypsin [EC 3.4.21.4] and chymotrypsin [EC 3.4.21.1]. (+info)A possible effect of different light sources on pregnancy rates following gamete intra-fallopian transfer. (4/259)
A retrospective study of 34 sequential gamete intra-Fallopian transfer (GIFT) procedures suggested a significant effect on pregnancy rates associated with the different laparoscopic light sources, with a pregnancy rate of 50% in 22 cycles using a halogen light source and 9% in 12 cycles using a xenon light source. Other explanatory variables were explored, but none was to have a significant effect on the pregnancy rate. Further investigation revealed that the xenon light source emitted more ultraviolet light than the conventional halogen light source--suggesting a possible detrimental effect of ultraviolet light on the gametes in the GIFT procedure. (+info)Induction and prevention of micronuclei and chromosomal aberrations in cultured human lymphocytes exposed to the light of halogen tungsten lamps. (5/259)
Previous studies have shown that the light emitted by halogen tungsten lamps contains UV radiation in the UV-A, UV-B and UV-C regions, induces mutations and irreparable DNA damage in bacteria, enhances the frequency of micronuclei in cultured human lymphocytes and is potently carcinogenic to the skin of hairless mice. The present study showed that the light emitted by an uncovered, traditional halogen lamp induces a significant, dose-related and time-related increase not only in micronuclei but also in chromosome-type aberrations, such as breaks, and even more in chromatid-type aberrations, such as isochromatid breaks, exchanges and isochromatid/chromatid interchanges, all including gaps or not, in cultured human lymphocytes. All these genotoxic effects were completely prevented by shielding the same lamp with a silica glass cover, blocking UV radiation. A new model of halogen lamp, having the quartz bulb treated in order to reduce the output of UV radiation, was considerably less genotoxic than the uncovered halogen lamp, yet induction of chromosomal alterations was observed at high illuminance levels. (+info)DL-2-Haloacid dehalogenase from Pseudomonas sp. 113 is a new class of dehalogenase catalyzing hydrolytic dehalogenation not involving enzyme-substrate ester intermediate. (6/259)
DL-2-Haloacid dehalogenase from Pseudomonas sp. 113 (DL-DEX 113) catalyzes the hydrolytic dehalogenation of D- and L-2-haloalkanoic acids, producing the corresponding L- and D-2-hydroxyalkanoic acids, respectively. Every halidohydrolase studied so far (L-2-haloacid dehalogenase, haloalkane dehalogenase, and 4-chlorobenzoyl-CoA dehalogenase) has an active site carboxylate group that attacks the substrate carbon atom bound to the halogen atom, leading to the formation of an ester intermediate. This is subsequently hydrolyzed, resulting in the incorporation of an oxygen atom of the solvent water molecule into the carboxylate group of the enzyme. In the present study, we analyzed the reaction mechanism of DL-DEX 113. When a single turnover reaction of DL-DEX 113 was carried out with a large excess of the enzyme in H(2)(18)O with a 10 times smaller amount of the substrate, either D- or L-2-chloropropionate, the major product was found to be (18)O-labeled lactate by ionspray mass spectrometry. After a multiple turnover reaction in H(2)(18)O, the enzyme was digested with trypsin or lysyl endopeptidase, and the molecular masses of the peptide fragments were measured with an ionspray mass spectrometer. No peptide fragments contained (18)O. These results indicate that the H(2)(18)O of the solvent directly attacks the alpha-carbon of 2-haloalkanoic acid to displace the halogen atom. This is the first example of an enzymatic hydrolytic dehalogenation that proceeds without producing an ester intermediate. (+info)Mcm2, but not RPA, is a component of the mammalian early G1-phase prereplication complex. (7/259)
Previous experiments in Xenopus egg extracts identified what appeared to be two independently assembled prereplication complexes (pre-RCs) for DNA replication: the stepwise assembly of ORC, Cdc6, and Mcm onto chromatin, and the FFA-1-mediated recruitment of RPA into foci on chromatin. We have investigated whether both of these pre-RCs can be detected in Chinese hamster ovary (CHO) cells. Early- and late-replicating chromosomal domains were pulse-labeled with halogenated nucleotides and prelabeled cells were synchronized at various times during the following G1-phase. The recruitment of Mcm2 and RPA to these domains was examined in relation to the formation of a nuclear envelope, specification of the dihydrofolate reductase (DHFR) replication origin and entry into S-phase. Mcm2 was loaded gradually and cumulatively onto both early- and late-replicating chromatin from late telophase throughout G1-phase. During S-phase, detectable Mcm2 was rapidly excluded from PCNA-containing active replication forks. By contrast, detergent-resistant RPA foci were undetectable until the onset of S-phase, when RPA joined only the earliest-firing replicons. During S-phase, RPA was present with PCNA specifically at active replication forks. Together, our data are consistent with a role for Mcm proteins, but not RPA, in the formation of mammalian pre-RCs during early G1-phase. (+info)Effect of Tn10/Tn5 transposons on the survival and mutation frequency of halogen light-irradiated AB1157 Escherichia coli K-12. (8/259)
We show here that the Tn10/Tn5 transposon when inserted into the chromosome of strain AB1157 makes the bacteria more sensitive to and less mutable by halogen light irradiation. These effects are most probably caused by depletion of UmuD and UmuC proteins since: (i) transformation of the transposon-bearing bacteria with plasmids harbouring umuD'C (or umuDC) leads to recovery of the original survival and mutation frequencies; (ii) insertion of Tn10/Tn5 into chromosomal DNA has no effect on the level of mutation induced by ethyl methane-sulphonate treatment, a mutagen whose activity is umuDC-independent; (iii) the decline in survival is in about the same range for Tn10-bearing bacteria as for bacteria with deleted umuDC. However, whereas transformation of bacteria deleted in umuDC with plasmids carrying umuD'C/umuDC leads to full recovery of halogen light-induced mutability, recovery of survival is poor. This suggests that the mechanisms leading to umuDC-dependent mutagenesis and umuDC-dependent protection of cell survival are different. None of these effects occurs in bacteria bearing the Tn9 transposon in their DNA. (+info)1. Improper brushing techniques: Brushing too hard or with a hard-bristled toothbrush can wear down the tooth surface.
2. Poor diet: Consuming hard, sticky, or acidic foods and drinks can cause wear on the teeth.
3. Grinding or clenching: Grinding or clenching teeth can cause wear on the opposing teeth, leading to abrasion.
4. Gastric reflux: Stomach acid can wear down the teeth over time.
5. Dental work: Teeth that have undergone dental procedures such as fillings, crowns, or bonding may be more prone to abrasion.
Symptoms of tooth abrasion may include:
* Sensitivity to hot or cold temperatures
* Pain when chewing or biting
* Unsightly appearance of the teeth
* Chipping or cracking of the teeth
Treatment for tooth abrasion depends on the severity of the condition and may include:
1. Desensitizing toothpaste: Using a toothpaste specifically designed for sensitivity can help alleviate discomfort.
2. Fluoride treatments: Applying fluoride to the teeth can help strengthen the enamel and prevent further wear.
3. Dental fillings or crowns: In severe cases, dental fillings or crowns may be necessary to repair damaged teeth.
4. Changing oral habits: Avoiding hard, sticky, or acidic foods and drinks, and practicing proper brushing and flossing techniques can help prevent further abrasion.
5. Mouth guards: Wearing a mouth guard at night to prevent grinding or clenching can help alleviate symptoms.
It is important to maintain good oral hygiene and visit a dentist regularly for check-ups and cleanings to prevent and detect tooth abrasion early on.
Halogen
Halogen (disambiguation)
Halogen (album)
Halogen Communications
Halogen Foundation
Halogen oven
Halogen (band)
Halogen bond
Halogen lamp
Halogen acne
Halogen Software
Halogen TV
Halogen dance rearrangement
Carius halogen method
Halogen addition reaction
Halogen Group Nigeria
Metal-halogen exchange
Low smoke zero halogen
Origin and use of the term metalloid
Polyhalogen ions
Hypobromite
Nonmetal
List of nonmetal monographs
Block (periodic table)
Cerium(IV) fluoride
Dichlorine heptoxide
Barbara J. Finlayson-Pitts
Stage lighting instrument
Nickel tetracarbonyl
Daniel Jackson (footballer)
Brickshelf Gallery - halogen.png
Garden Guides | Common Halogen Disinfectants
Terahertz Detection of Halogen Additive-Containing Plastics
Halogen
Tungsten Halogen Bulb (100-watt)
Stage/Studio Halogen
Halogen | Difference Between
"All in the Family" Properties of Halogens | Flinn...
MR13 Halogen Reflector
Dedolight Non-Blackened Halogen Lamp (150W/24V) DL150-NB B&H
Nexans - HSL Zuid: halogen-free cables in the Netherlands
HLX® - Halogen Technology Family - BulbAmerica
Halogen Light Bulbs | Bulbs.com
Sylvania Capsylite 14588 - 45W Halogen PAR38 | 1000Bulbs.com
Re-lamped: Halogen to LED conversions | Landscape Management
Automotive Aftermarket HID, Halogen & LED Lights | KC Lights
PIAA | H113 (9008) XTreme White Hybrid Twin Pack Halogen Bulbs #23-10113
Halogen-Free Flame Retardant Compounds - RTP Company
HALOGEN CHART LIGHT BRASS - Fawcett Boat Supplies
Changing MR16 bathroom lights to LED (from halogen) | DIYnot Forums
Showing results for tags 'halogen'. - GM-Trucks.com
Mettler Toledo HR83P Halogen Moisture Analyzer Listing #778111
Unity Manufacturing 380 Roof Mount Halogen Spotlight | Waytek
Bronze, Mid-Century, Halogen, Track Lighting | Lamps Plus
Mains Voltage Halogen
Halogen
Incandescent Light Bulb - Halogen Light Bulb - HID Bulb - Video Production Lighting
HEINE XHL Xenon Halogen spare bulb #069 - HEINE Optotechnik
Casell 100W Halogen Linear 78mm 240V
Bulb3
- It has a T3 lamp shape, and is a halogen bulb. (topbulb.com)
- Description This 24V/250W tungsten halogen light bulb is most commonly used in applications like projectors and fiber optics. (bulbamerica.com)
- Looking for a 50 watt halogen bulb, we have it. (bulbs.com)
Lamp6
- This 150-watt, 24-volt Non-Blackened Halogen Lamp from Dedolight is a spare or replacement lamp for heads that feature a GY6.35 2-pin sockets. (bhphotovideo.com)
- Those are the perks of using a halogen lamp. (bulbs.com)
- This Sylvania Capsylite 14588 45-watt halogen PAR38 lamp features Sylvania's advanced SPL optics package which combines a unique spiral-fluted reflector with a patented spiral lens to enhance the performance of the 30-degree beam angle. (1000bulbs.com)
- I don't want to have to stock halogen lamps and take up room in my service vehicles and storage to carry a lamp that will rarely get used. (landscapemanagement.net)
- This optical system's features include monocular observation, magnification X10, and the use of an illumination system (3.5-V halogen lamp). (medscape.com)
- The illumination system includes a halogen lamp (12 V/50 W). The stereomicroscope is expensive, is large and bulky, and is only available in a few centers. (medscape.com)
Incandescent1
- Although using incandescent or halogen bulbs in lamps can give good focused light, be careful with these lights. (medlineplus.gov)
Lamps2
- OSRAM Halogen HLX lamps utilize Xenon gas instead of Krypton, which provides up to 10% greater output over the lamp's lifetime. (bulbamerica.com)
- There are too many variables that create liability for us as a company to replace halogen lamps without taking voltage and amperage readings everywhere. (landscapemanagement.net)
Bulbs3
- We offer energy-efficient replacement halogen bulbs in numerous styles, including floods, spots, capsule and tube-shaped bulbs for both home and business. (bulbs.com)
- Bulbrite, Eiko, and Philips halogen bulbs can all be found in one place. (bulbs.com)
- They produce high contrast and do not get as hot as halogen bulbs. (medlineplus.gov)
MR161
- I currently have 6 halogen MR16 12v lights in the bathroom. (diynot.com)
Disinfection1
- Oxide and peroxide bleaches use non-halogen chemicals for disinfection. (gardenguides.com)
LEDS2
- As LED prices have dropped, more and more, homeowners have been looking to install LEDs in place of the halogens that would fail at least annually, compared to LEDs that can last six to seven years without failing. (landscapemanagement.net)
- Therefore the light emitting diodes (LEDs), have been suggested in opposite to halogen light, which can present more advantages. (bvsalud.org)
Bromine1
- In addition, the THz refractive index of acrylonitrile butadiene styrene (ABS) increases in proportion to the content of bromine (Br), which can be used to quantitatively evaluate the presence of halogen additives in waste plastic. (scirp.org)
Compounds1
- What are the similarities and differences in the chemical properties of the halogens and their compounds? (flinnsci.com)
Lights2
- Southern Lights of N.C. performs one to two halogen to LED conversions per week. (landscapemanagement.net)
- At Southern Lights, a halogen to LED conversion sale is usually triggered by a service call. (landscapemanagement.net)
Fixtures1
- Only for use in approved enclosed halogen fixtures. (ushio.com)
Lighting5
- Though LED landscape lighting installations are the norm in 2018, some contractors emphasize the opportunity they see in halogen to LED conversions. (landscapemanagement.net)
- Most landscape lighting customers quickly understand the benefits of converting from halogen to LED, lighting professionals say. (landscapemanagement.net)
- We typically don't give our clients an option for halogen, especially on systems where we weren't originally a part of the lighting design or installation," Bryant says. (landscapemanagement.net)
- From LED and HID to Halogen our lighting products are all race-tested and adventure-ready. (kchilites.com)
- So my question, is a 12v LED transformer any different to a 12v transformer for halogen lighting? (diynot.com)
Commonly1
- Halogens, a series of non-metal elements that are lethal to living organisms, are commonly used in disinfectants. (gardenguides.com)
Evaluate1
- The aim of this study was to evaluate the microhardness of the two resin composites, a condensable resin (Tetric Ceram) and other flow resin (Tetric Flow), using two light curing units, a halogen light (Ultarlux EL) and a LED (Ultraled XP). (bvsalud.org)
Results1
- The results suggest that halogen light curing unit is more effective than LED. (bvsalud.org)
Service2
- McKay's conversion approach has been a marketing campaign directed at annual service customers and also at homes where McKay did the halogen installation years ago but hasn't maintained an annual contract with the client. (landscapemanagement.net)
- We still do a lot of halogen on the service side of things-everyone can't go to LED right off the bat," he says. (landscapemanagement.net)
SYSTEMS2
- McKay has added three to four jobs per month converting halogen systems over to LED. (landscapemanagement.net)
- But we're not installing halogen systems anymore, and it's harder and harder to find materials to keep those systems going. (landscapemanagement.net)
Bulbs2
- Although using incandescent or halogen bulbs in lamps can give good focused light, be careful with these lights. (medlineplus.gov)
- They produce high contrast and do not get as hot as halogen bulbs. (medlineplus.gov)
Chlorine1
- Personal breathing zone and area sampling was conducted for ammonia, carbon monoxide, halogens (chlorine and iodine), and egg protein. (cdc.gov)
Ammonia1
- Environmental sampling revealed ammonia, carbon monoxide, and halogen levels were well below occupational exposure criteria. (cdc.gov)
Lamps2
- These include tungsten-halogen lamps, fluorescent tubes, fiberoptic systems, and gallium nitride LED lights. (medscape.com)
- Halogen-based phototherapy lamps, or spotlights, use a commercially available tungsten- halogen light bulb and direct a strong beam of white/yellow light towards the infant. (medscape.com)
ADVANTAGES1
- Therefore the light emitting diodes (LEDs), have been suggested in opposite to halogen light, which can present more advantages. (bvsalud.org)
Light3
- The light curing of resin composite by halogen light is frequent in dental. (bvsalud.org)
- The aim of this study was to evaluate the microhardness of the two resin composites, a condensable resin (Tetric Ceram) and other flow resin (Tetric Flow), using two light curing units, a halogen light (Ultarlux EL) and a LED (Ultraled XP). (bvsalud.org)
- The results suggest that halogen light curing unit is more effective than LED. (bvsalud.org)
Environmental1
- Organic halogens in the environment: studies of environmental biodegradability and human exposure. (nih.gov)
Water1
- Additionally, due to the associated heat output, halogen lights may result in increased insensible water loss in infants receiving phototherapy. (medscape.com)