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The subject of interest is:
waterpipe, water-pipe, nargile, narghile, arguileh, arguile, shisha, sheesha, chichi, hubble bubble, hubbly bubbly, goza, hookah, bong
| Title | Pub Year | Author | SearchLink Sort descending |
|---|---|---|---|
| Biofilm formation by and antifungal susceptibility of Candida isolates from urine | 2007 | Department of Medicine and Microbiology and Immunology, Ullmann 1223, 1300 Morris Park Ave., Albert Einstein College of Medicine, Bronx, NY 10461, USA. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Applied and Environmental Microbiology
Periodical, Abbrev.
Appl.Environ.Microbiol.
Pub Date Free Form
Mar
Volume
73
Issue
6
Start Page
1697
Other Pages
1703
Notes
LR: 20140910; GR: D43TW001403/TW/FIC NIH HHS/United States; GR: R0-1 AI59681/AI/NIAID NIH HHS/United States; GR: R01 AI059681/AI/NIAID NIH HHS/United States; GR: R01 AI059681-05/AI/NIAID NIH HHS/United States; JID: 7605801; 0 (Antifungal Agents); 0 (Cultu
Place of Publication
United States
ISSN/ISBN
0099-2240; 0099-2240
Accession Number
PMID: 17261524
Language
eng
SubFile
Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; IM
DOI
AEM.02439-06 [pii]
Output Language
Unknown(0)
PMID
17261524
Abstract
Biofilm formation (BF) in the setting of candiduria has not been well studied. We determined BF and MIC to antifungals in Candida spp. isolates grown from urine samples of patients and performed a retrospective chart review to examine the correlation with risk factors. A total of 67 Candida spp. isolates were grown from urine samples from 55 patients. The species distribution was C. albicans (54%), C. glabrata (36%), and C. tropicalis (10%). BF varied greatly among individual Candida isolates but was stable in sequential isolates during chronic infection. BF also depended on the growth medium and especially in C. albicans was significantly enhanced in artificial urine (AU) compared to RPMI medium. In nine of the C. albicans strains BF was 4- to 10-fold higher in AU, whereas in three of the C. albicans strains and two of the C. glabrata strains higher BF was measured in RPMI medium than in AU. Determination of the MICs showed that planktonic cells of all strains were susceptible to amphotericin B (AMB) and caspofungin (CASPO) and that three of the C. glabrata strains and two of the C. albicans strains were resistant to fluconazole (FLU). In contrast, all biofilm-associated adherent cells were resistant to CASPO and FLU. The biofilms of 14 strains (28%) were sensitive to AMB (MIC(50) of <1 mug/ml). Correlation between degree of BF and MIC of AMB was not seen in RPMI grown biofilms but was present when grown in AU. A retrospective chart review demonstrated no correlation of known risk factors of candiduria with BF in AU or RPMI. We conclude that BF is a stable characteristic of Candida strains that varies greatly among clinical strains and is dependent on the growth medium. Resistance to AMB is associated with higher BF in AU, which may represent the more physiologic medium to test BF. Future studies should address whether in vitro BF can predict treatment failure in vivo.
Descriptors
Antifungal Agents/pharmacology, Biofilms/drug effects/growth & development, Candida/classification/drug effects/isolation & purification/physiology, Culture Media, Drug Resistance, Fungal, Female, Humans, Male, Microbial Sensitivity Tests/methods, Urinary Tract Infections/microbiology, Urine/microbiology
Links
Book Title
Database
Publisher
Data Source
Authors
Jain,N., Kohli,R., Cook,E., Gialanella,P., Chang,T., Fries,B. C.
Original/Translated Title
URL
Date of Electronic
20070119
PMCID
PMC1828833
Editors
|
|||
| RF ablation of intestinal metaplasia (Barrett esophagus) | 2004 | Read more... | |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Conference proceedings : ...Annual International Conference of the IEEE Engineering in Medicine and Biology Society.IEEE Engineering in Medicine and Biology Society.Annual Conference
Periodical, Abbrev.
Conf.Proc.IEEE Eng.Med.Biol.Soc.
Pub Date Free Form
Volume
7
Issue
Start Page
5128
Other Pages
Notes
LR: 20140821; JID: 101243413; ppublish
Place of Publication
United States
ISSN/ISBN
1557-170X; 1557-170X
Accession Number
PMID: 17271477
Language
eng
SubFile
Journal Article
DOI
10.1109/IEMBS.2004.1404421 [doi]
Output Language
Unknown(0)
PMID
17271477
Abstract
Esophageal intestinal metaplasia, otherwise known as Barrett's Esophagus, is a pre-cancerous condition that afflicts over 1 million Americans annually. Barrett's Esophagus is caused by chronic esophageal exposure to stomach acid which can occur in patients afflicted with Gastro Esophageal Reflux Disease (GERD). The lining of the esophagus undergoes a metaplastic change, from normal squamous cell epithelium to columnar cell epithelium. Over time, this condition can progress to dysplasia and ultimately to adenocarcinoma. Currently, there are no widely practiced therapies for Barrett's Esophagus. Patients diagnosed with this disease are routinely screened to ensure do not have cancer, yet. It has been shown that if the GERD is controlled (i.e. a normal esophageal pH is maintained) and the metaplastic lining of the esophagus is carefully removed, i.e. no damage to underlying tissues), the normal squamous epithelial cells will repopulate the esophagus. A system has been designed to couple radiofrequency (RF) energy to the epithelial lining of the esophagus to effectively ablate the metaplastic cells and allow normal squamous cell repopulation. The design principles of this system and the resulting effects are the subject of this presentation.
Descriptors
Links
Book Title
Database
Publisher
Data Source
Authors
Jackson,J.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
|
|||
| Dynamics and biodiversity of populations of lactic acid bacteria and acetic acid bacteria involved in spontaneous heap fermentation of cocoa beans in Ghana | 2007 | Research Group of Industrial Microbiology and Food Biotechnology (IMDO), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Applied and Environmental Microbiology
Periodical, Abbrev.
Appl.Environ.Microbiol.
Pub Date Free Form
Mar
Volume
73
Issue
6
Start Page
1809
Other Pages
1824
Notes
LR: 20140907; JID: 7605801; 0 (DNA, Bacterial); 0 (DNA, Ribosomal); 2968PHW8QP (Citric Acid); 30237-26-4 (Fructose); 33X04XA5AT (Lactic Acid); 3K9958V90M (Ethanol); 3OWL53L36A (Mannitol); Q40Q9N063P (Acetic Acid); OID: NLM: PMC1828797; 2007/02/02 [aheadof
Place of Publication
United States
ISSN/ISBN
0099-2240; 0099-2240
Accession Number
PMID: 17277227
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
AEM.02189-06 [pii]
Output Language
Unknown(0)
PMID
17277227
Abstract
The Ghanaian cocoa bean heap fermentation process was studied through a multiphasic approach, encompassing both microbiological and metabolite target analyses. A culture-dependent (plating and incubation, followed by repetitive-sequence-based PCR analyses of picked-up colonies) and culture-independent (denaturing gradient gel electrophoresis [DGGE] of 16S rRNA gene amplicons, PCR-DGGE) approach revealed a limited biodiversity and targeted population dynamics of both lactic acid bacteria (LAB) and acetic acid bacteria (AAB) during fermentation. Four main clusters were identified among the LAB isolated: Lactobacillus plantarum, Lactobacillus fermentum, Leuconostoc pseudomesenteroides, and Enterococcus casseliflavus. Other taxa encompassed, for instance, Weissella. Only four clusters were found among the AAB identified: Acetobacter pasteurianus, Acetobacter syzygii-like bacteria, and two small clusters of Acetobacter tropicalis-like bacteria. Particular strains of L. plantarum, L. fermentum, and A. pasteurianus, originating from the environment, were well adapted to the environmental conditions prevailing during Ghanaian cocoa bean heap fermentation and apparently played a significant role in the cocoa bean fermentation process. Yeasts produced ethanol from sugars, and LAB produced lactic acid, acetic acid, ethanol, and mannitol from sugars and/or citrate. Whereas L. plantarum strains were abundant in the beginning of the fermentation, L. fermentum strains converted fructose into mannitol upon prolonged fermentation. A. pasteurianus grew on ethanol, mannitol, and lactate and converted ethanol into acetic acid. A newly proposed Weissella sp., referred to as "Weissella ghanaensis," was detected through PCR-DGGE analysis in some of the fermentations and was only occasionally picked up through culture-based isolation. Two new species of Acetobacter were found as well, namely, the species tentatively named "Acetobacter senegalensis" (A. tropicalis-like) and "Acetobacter ghanaensis" (A. syzygii-like).
Descriptors
Acetic Acid/metabolism, Acetobacter/classification/isolation & purification/metabolism, Biodiversity, Bioreactors, Cacao/metabolism/microbiology, Carbohydrate Metabolism, Citric Acid/metabolism, Cluster Analysis, Colony Count, Microbial, DNA Fingerprinting, DNA, Bacterial/genetics, DNA, Ribosomal/genetics, Ethanol/metabolism, Fermentation, Fructose/metabolism, Gram-Positive Bacteria/classification/isolation & purification/metabolism, Lactic Acid/metabolism, Lactobacillus/classification/isolation & purification/metabolism, Mannitol/metabolism, Streptococcaceae/classification/isolation & purification/metabolism, Yeasts/metabolism
Links
Book Title
Database
Publisher
Data Source
Authors
Camu,N., De Winter,T., Verbrugghe,K., Cleenwerck,I., Vandamme,P., Takrama,J. S., Vancanneyt,M., De Vuyst,L.
Original/Translated Title
URL
Date of Electronic
20070202
PMCID
PMC1828797
Editors
|
|||
| The effect of thermocycling on the adhesion of self-etching adhesives on dental enamel and dentin | 2007 | Department of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Alexandria, Egypt. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
The journal of contemporary dental practice
Periodical, Abbrev.
J.Contemp.Dent.Pract.
Pub Date Free Form
1-Feb
Volume
8
Issue
2
Start Page
17
Other Pages
24
Notes
LR: 20100826; JID: 101090552; 0 (Composite Resins); 0 (Dentin-Bonding Agents); 0 (Polymethacrylic Acids); 0 (Prime and Bond NT); 0 (Prompt L-Pop); 0 (Resin Cements); 0 (Xeno III); epublish
Place of Publication
United States
ISSN/ISBN
1526-3711; 1526-3711
Accession Number
PMID: 17277823
Language
eng
SubFile
Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; D; IM
DOI
1526-3711-372 [pii]
Output Language
Unknown(0)
PMID
17277823
Abstract
AIM: The aim of the present study was to investigate the effectiveness of one total-etch self-priming adhesive and two one-step self-etching adhesive systems on the adhesion of a resin composite to both dentin and enamel. The effect of thermocycling on the adhesion was also investigated. The null hypothesis tested was thermocycling would not affect bond strengths to enamel and dentin treated with self-etching adhesives or a total-etch adhesive. METHODS AND MATERIALS: Two single-step self-etching adhesives [Xeno III (XE3) and Prompt L-Pop (PP)] and one two-step total-etch adhesive system (Prime & Bond NT) (P&B NT) were used in this study. Thirty caries-free unrestored human third molars were used to make specimens of enamel and dentin. Different adhesives were applied on enamel and dentin surfaces according to the manufacturer's instructions then hybrid composite restorative material was condensed on the surface using a mold. The bonded specimens were stored in distilled water at 37 masculineC for 24 hours before being tested. Half of the bonded specimens were tested for shear bond strength without thermocycling. The other half of the test specimens were thermocycled using a thermocycling apparatus in water baths held at 5 masculineC and 55 masculineC with a dwell time of one minute each for 10,000 cycles prior to shear testing. The mean shear bond strength before and after thermocycling was calculated, and the results were subjected to two-way analysis of variance (ANOVA) and repeated measure design to show the interaction between different materials and different times. RESULTS: The results showed shear bond strength on both enamel and dentin of the total-etch adhesive and the self-etching adhesives decreased after the specimens were subjected to thermocycling. CONCLUSIONS: The null hypothesis tested "thermocycling would not affect bond strengths treated with self-etching adhesives" was rejected. Furthermore, the study revealed the following: 1. The shear bond strength to both enamel and dentin of the total-etch adhesive and the self-etching adhesives decreased after the specimens were subjected to thermocycling. 2. XE3 achieved the highest bond strength to both enamel and dentin (26.994+/-1.17 and 25.22+/-1.26, respectively). 3. XE3 showed even better bonding after thermocycling to enamel and dentin than the total-etching system or PP. 4. Although PP bonded to enamel showed lower shear bond strength value than XE3, it has durable bond strength even after thermocycling.
Descriptors
Composite Resins, Dental Bonding, Dental Enamel, Dental Etching/methods, Dental Stress Analysis, Dentin, Dentin-Bonding Agents, Hot Temperature, Humans, Polymethacrylic Acids, Resin Cements, Shear Strength, Smear Layer
Links
Book Title
Database
Publisher
Data Source
Authors
El-Araby,A. M., Talic,Y. F.
Original/Translated Title
URL
Date of Electronic
20070201
PMCID
Editors
|
|||
| Attitudes and behaviour concerning cigarette smoking among the students of the first year at the Health Department | 2006 | Katedra Medycyny Spolecznej i Zapobiegawczej, Uniwersytetu Medycznego w Lodzi. office@cindi.org.pl | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Przeglad lekarski
Periodical, Abbrev.
Przegl.Lek.
Pub Date Free Form
Volume
63
Issue
10
Start Page
1041
Other Pages
1044
Notes
LR: 20151119; JID: 19840720R; 0 (Tobacco Smoke Pollution); ppublish
Place of Publication
Poland
ISSN/ISBN
0033-2240; 0033-2240
Accession Number
PMID: 17288211
Language
pol
SubFile
English Abstract; Journal Article; IM
DOI
Output Language
Unknown(0)
PMID
17288211
Abstract
Smoking is still very common in Poland. Our country is among the leading countries with the greatest consumption of cigarettes. It is estimated that currently, there are about 40% smokers among men and 20% among women. In the future, most of the graduates from the Health Department will take care of the promotion of healthy life style and health education in the society. It is important that their theoretical knowledge be supported by proper health bases. A health centre worker who is inhaling smoke and at the same time encouraging quitting smoking is by no means credible. The aim of this work was to establish the participation of those students who are inhaling tobacco smoke that is among the students of the three departments of daily students of the Health Department. There were 108 female students who underwent the survey among the first year students of the Heath Department of Medical University of Lodz. The tool used was a survey. In the research carried out between 1st and 15th March 2006, 104 students (96.3%) took part. Among those who handed the surveys back, there were 32 males (30.8%) and 72 women (69.2%). In the group of respondents, which included 104 people, 33 (31.7%) stated that in January and February 2006 smoked cigarettes and 71 people (68.3%) claimed that within that time they did not smoke a single cigarette. Among the smokers, there were 11 males (f = 0.33) and 22 women (f = 0.67), whereas in the non-smokers' group, there were 21 male students (f = 0.30) and 50 female students (f = 0.70). In the past, there were 55 surveyed who inhaled tobacco smoke (52.9%), whereas 49 surveyed (47.1%) stated that they had never smoked in the past. In the smokers' group, there were 18 male students (f = 0.30) and 37 female students (f = 0.70). Among those who claimed they had never smoked before, there were 14 male students (f = 0.30) and 35 female students studies of the Health Department of Medical University of Lodz inhaled tobacco smoke. In comparison with the studies carried out at other universities in Poland, the received result in the worst. It is necessary to undertake actions that would lead to some changes in the behaviour of the students of the first year of Heath Department in order to achieve the greatest possible ratio of non-smokers before their graduation.
Descriptors
Adult, Age of Onset, Female, Health Education, Health Knowledge, Attitudes, Practice, Humans, Male, Peer Group, Poland/epidemiology, Population Surveillance, Prevalence, Smoking/epidemiology/prevention & control/psychology, Smoking Cessation, Students, Medical/psychology/statistics & numerical data, Surveys and Questionnaires, Tobacco Smoke Pollution/statistics & numerical data, Tobacco Use Disorder/epidemiology/prevention & control/psychology
Links
Book Title
Database
Publisher
Data Source
Authors
Kowalska,A., Rzeznicki,A., Drygas,W.
Original/Translated Title
Postawy i zachowania dotyczace palenia tytoniu studentow pierwszego roku Wydzialu Nauk o Zdrowiu
URL
Date of Electronic
PMCID
Editors
|
|||
| Influence of tobacco smoking to development of the fetus, newborn and child--a review | 2006 | Katedra i Klinika Zdrowia Matki i Dziecka, Akademii Medycznej w Poznaniu. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Przeglad lekarski
Periodical, Abbrev.
Przegl.Lek.
Pub Date Free Form
Volume
63
Issue
10
Start Page
1135
Other Pages
1137
Notes
JID: 19840720R; 0 (Tobacco Smoke Pollution); RF: 32; ppublish
Place of Publication
Poland
ISSN/ISBN
0033-2240; 0033-2240
Accession Number
PMID: 17288237
Language
pol
SubFile
English Abstract; Journal Article; Review; IM
DOI
Output Language
Unknown(0)
PMID
17288237
Abstract
Maternal smoking during pregnancy is associated with not only low birth weight and intrauterine fetal growth retardation or sudden infant death syndrome but also causes complications in postnatal growth and development. The aim of the study was to estimate the effect of tobacco smoking during pregnancy on development of the fetus, newborn and child. We conclude that active and passive smoking during pregnancy is a risk factor for the child.
Descriptors
Child, Child Development, Female, Fetal Development, Humans, Infant, Infant, Low Birth Weight, Infant, Newborn, Infant, Small for Gestational Age, Maternal-Fetal Exchange, Pregnancy, Pregnancy Complications/epidemiology, Prenatal Exposure Delayed Effects/epidemiology/prevention & control, Smoking/epidemiology/prevention & control, Sudden Infant Death/epidemiology, Tobacco Smoke Pollution/prevention & control/statistics & numerical data
Links
Book Title
Database
Publisher
Data Source
Authors
Szymanowski,K., Chmaj-Wierzchowska,K., Florek,E., Opala,T.
Original/Translated Title
Wplyw dymu tytoniowego na rozwoj plodu, noworodka i dziecka--przeglad pismiennictwa
URL
Date of Electronic
PMCID
Editors
|
|||
| Detection and characterisation of CTX-M and CMY-2 beta-lactamases among Escherichia coli isolates from farm animals in Guangdong Province of China | 2007 | College of Veterinary Medicine, Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou 510642, China. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
International journal of antimicrobial agents
Periodical, Abbrev.
Int.J.Antimicrob.Agents
Pub Date Free Form
May
Volume
29
Issue
5
Start Page
576
Other Pages
581
Notes
JID: 9111860; 0 (Anti-Bacterial Agents); EC 3.5.2.6 (beta-Lactamases); 2006/09/20 [received]; 2006/12/22 [revised]; 2006/12/22 [accepted]; 2007/02/20 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
0924-8579; 0924-8579
Accession Number
PMID: 17314033
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
S0924-8579(07)00038-6 [pii]
Output Language
Unknown(0)
PMID
17314033
Abstract
The objective of this study was to characterise the beta-lactamase genes of cephalosporin-resistant Escherichia coli isolated from farm animals in Guangdong Province of China. Of 592 E. coli isolates recovered from farm animals from 2003-2005, 50 (8.4%) showed cephalosporin resistance. Polymerase chain reaction and sequencing analysis showed that 14 isolates (2.4%) from chickens, ducks, pigs and partridges were positive for the bla(CTX-M) gene (10 for bla(CTX-M-14) and 4 for bla(CTX-M-27)). CMY-2 was detected for the first time in mainland China in six E. coli isolates (1.0%) from chickens and goose. Except for one isolate, bla(CTX-M)- and bla(CMY-2)-containing isolates also harboured the bla(TEM-1b) gene. Conjugation experiments demonstrated that the bla(CTX-M) and bla(TEM) genes could be transferred to E. coli DH5alpha. Pulsed-field gel electrophoresis (PFGE) showed that the 14 CTX-M-producing isolates belonged to 12 different types. Two isolates (one from a chicken, the other from a pig) containing CTX-M-14 showed indistinguishable PFGE patterns, indicating clonal dissemination of this strain among animals from different farms. This study describes for the first time the emergence of CTX-M- and CMY-2-producing E. coli among farm animals in China, with the CTX-M-9 group being the predominant extended-spectrum beta-lactamase detected.
Descriptors
Animals, Animals, Domestic/microbiology, Anti-Bacterial Agents/pharmacology, Cephalosporin Resistance, Chickens, China, Cloning, Molecular, Drug Resistance, Bacterial, Ducks, Electrophoresis, Gel, Pulsed-Field, Escherichia coli/drug effects/enzymology, Feces/microbiology, Microbial Sensitivity Tests, Swine, beta-Lactamases/chemistry/genetics/isolation & purification
Links
Book Title
Database
Publisher
Data Source
Authors
Liu,J. H., Wei,S. Y., Ma,J. Y., Zeng,Z. L., Lu,D. H., Yang,G. X., Chen,Z. L.
Original/Translated Title
URL
Date of Electronic
20070220
PMCID
Editors
|
|||
| An aniline-based fiber coating for solid phase microextraction of polycyclic aromatic hydrocarbons from water followed by gas chromatography-mass spectrometry | 2007 | Department of Chemistry, Sharif University of Technology, Tehran, Iran. bagheri@sharif.edu | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Journal of chromatography.A
Periodical, Abbrev.
J.Chromatogr.A
Pub Date Free Form
8-Jun
Volume
1152
Issue
2-Jan
Start Page
168
Other Pages
174
Notes
LR: 20090115; JID: 9318488; 0 (Aniline Compounds); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 0 (polyaniline); 2006/10/02 [received]; 2007/01/28 [revised]; 2007/02/02 [accepted]; 2007/02/08 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
0021-9673; 0021-9673
Accession Number
PMID: 17316658
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
S0021-9673(07)00255-5 [pii]
Output Language
Unknown(0)
PMID
17316658
Abstract
A fiber coating from polyaniline (PANI) was electrochemically prepared and employed for solid phase microextraction (SPME) of some polycyclic aromatic hydrocarbons (PAHs) from water samples. The PANI film was directly electrodeposited on the platinum wire surface in sulfuric acid solution using cyclic voltammetry (CV) technique. The applicability of this coating was assessed employing a laboratory-made SPME device and gas chromatography with mass spectrometry (GC-MS) for the extraction of some PAHs from the headspace of aqueous samples. Application of wider potential range in CV led to a PANI with more stability against the temperature. The homogeneity and the porous surface structure of the film were examined by the scanning electron microscopy (SEM). The study revealed that this polymer is a suitable SPME fiber coating for extracting the selected PAHs. Important parameters influencing the extraction process were optimized and an extraction time of 40 min at 40 degrees C gave maximum peak area, when the aqueous sample was added with NaCl (20%, w/v). The synthesis of the PANI can be carried out conveniently and in a reproducible manner while it is rather inexpensive and stable against most of organic solvents. The film thickness of PANI can be precisely controlled by the number of CV cycles. The resulting thickness was roughly 20 microm after 20 cycles. At the optimum conditions, the relative standard deviation (RSD) for a double distilled water spiked with selected PAHs at ppb level were 8.80-16.8% (n = 3) and detection limits for the studied compounds were between 0.1-6 pg mL(-1). The performance of PANI was, also, compared with a commercial solid coated-based SPME fiber, carbowax/divinylbenzene (CW/DVB), under similar experimental conditions.
Descriptors
Aniline Compounds/chemistry, Gas Chromatography-Mass Spectrometry/methods, Microscopy, Electron, Scanning, Osmolar Concentration, Polycyclic Hydrocarbons, Aromatic/isolation & purification, Solid Phase Microextraction/instrumentation, Temperature, Water Pollutants, Chemical/isolation & purification
Links
Book Title
Database
Publisher
Data Source
Authors
Bagheri,H., Babanezhad,E., Es-haghi,A.
Original/Translated Title
URL
Date of Electronic
20070208
PMCID
Editors
|
|||
| Species-specific partitioning of soil water resources in an old-growth Douglas-fir-western hemlock forest | 2007 | USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, USA. fmeinzer@fs.fed.us | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Tree physiology
Periodical, Abbrev.
Tree Physiol.
Pub Date Free Form
Jun
Volume
27
Issue
6
Start Page
871
Other Pages
880
Notes
LR: 20131121; JID: 100955338; 0 (Soil); 059QF0KO0R (Water); ppublish
Place of Publication
Canada
ISSN/ISBN
0829-318X; 0829-318X
Accession Number
PMID: 17331905
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; IM
DOI
Output Language
Unknown(0)
PMID
17331905
Abstract
Although tree- and stand-level estimates of forest water use are increasingly common, relatively little is known about partitioning of soil water resources among co-occurring tree species. We studied seasonal courses of soil water utilization in a 450-year-old Pseudotsuga menziesii (Mirb.) Franco-Tsuga heterophylla (Raf.) Sarg. forest in southwestern Washington State. Soil volumetric water content (theta) was continuously monitored with frequency domain capacitance sensors installed at eight depths from 0.2 to 2 m at four locations in the vicinity of each species. Vertical profiles of root distribution and seasonal and daily courses of hydraulic redistribution (HR), sap flow and tree water status were also measured. Mean root area in the upper 60 cm of soil was significantly greater in the vicinity of T. heterophylla trees. However, seasonal water extraction on a root area basis was significantly greater near P. menziesii trees at all depths between 15 and 65 cm, leading to significantly lower water storage in the upper 65 cm of soil near P. menziesii trees at the end of the summer dry season. Greater apparent efficiency of P. menziesii roots at extracting soil water was attributable to a greater driving force for water uptake rather than to differences in root hydraulic properties between the species. The dependence of HR on theta was similar in soil near individuals of both species, but seasonal maximum rates of HR were greater in soil near P. menziesii because minimum values of theta were lower, implying a steeper water potential gradient between the upper and lower soil that acted as a driving force for water efflux from shallow roots. The results provide information on functional traits relevant for understanding the ecological distributions of these species and have implications for spatial variability of processes such as soil respiration and nutrient cycling.
Descriptors
Plant Roots/metabolism/physiology, Plant Transpiration/physiology, Pseudotsuga/metabolism/physiology, Soil, Species Specificity, Tsuga/metabolism/physiology, Water/metabolism
Links
Book Title
Database
Publisher
Data Source
Authors
Meinzer,F. C., Warren,J. M., Brooks,J. R.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
|
|||
| Ammonium and nitrate uptake, nitrogen productivity and biomass allocation in interior spruce families with contrasting growth rates and mineral nutrient preconditioning | 2007 | Centre for Forest Biology, University of Victoria, PO Box 3020, STN CSC, Victoria, BC V8N 1J3, Canada. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Tree physiology
Periodical, Abbrev.
Tree Physiol.
Pub Date Free Form
Jun
Volume
27
Issue
6
Start Page
901
Other Pages
909
Notes
LR: 20131121; JID: 100955338; 0 (Nitrates); 0 (Quaternary Ammonium Compounds); N762921K75 (Nitrogen); ppublish
Place of Publication
Canada
ISSN/ISBN
0829-318X; 0829-318X
Accession Number
PMID: 17331908
Language
eng
SubFile
Journal Article; IM
DOI
Output Language
Unknown(0)
PMID
17331908
Abstract
Four full-sib families of interior spruce (Picea glauca (Moench) Voss) x Picea engelmanii Parry ex Engelm.) with contrasting growth rates (two fast-growing and two slow-growing families) were grown aeroponically with either a 2% relative nitrogen addition rate or free access to nitrogen. Fast-growing families showed greater plasticity in allocating biomass to shoots at high nitrogen supply and to roots at low nitrogen supply than slow-growing families. Compared with the slow-growing families, short-term net ammonium uptake rate measured with an ion selective electrode was significantly greater in fast-growing families at high ammonium supply, but not at low supply. Net nitrate uptake showed the same trend, but differences among families were not significant. Results indicate that differences in seedling growth rate are partly a result of physiological differences in net nitrogen uptake efficiency and nitrogen productivity.
Descriptors
Algorithms, Biomass, Models, Biological, Nitrates/metabolism, Nitrogen/metabolism, Picea/growth & development/metabolism, Quaternary Ammonium Compounds/metabolism, Time Factors
Links
Book Title
Database
Publisher
Data Source
Authors
Miller,B. D., Hawkins,B. J.
Original/Translated Title
URL
Date of Electronic
PMCID
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