Health & Environmental Research Online (HERO)


Naphthalene


16,764 References Were Found:

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Comparison of photocatalytic degradation of dyes in relation to their structure

Authors: Byberg, R; Cobb, J; Martin, LD; Thompson, RW; Camesano, TA; Zahraa, O; Pons, MN (In Press) Environmental Science and Pollution Research. HERO ID: 1501213

[Less] The photocatalytic degradation of a series of six acid dyes (Direct Red 80, Direct Red 81, Direct Red . . . [More] The photocatalytic degradation of a series of six acid dyes (Direct Red 80, Direct Red 81, Direct Red 23, Direct Violet 51, Direct Yellow 27, and Direct Yellow 50) has been tested compared in terms of color removal, mineralization, and toxicity (Lactuca sativa L. test) after photocatalysis on immobilized titanium dioxide. The dyes were examined at their natural pH and after hydrolysis at pH 12. Results show that hydrolysis decreases strongly the efficiency of color removal, that full mineralization takes much longer reaction time than color removal, and that toxicity is only very partially reduced. Some structural parameters, related to the structure and the topology of the dye molecules, could be correlated with the apparent color removal rates at natural pH.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Tree bark as a biomonitor for assessing the atmospheric pollution and associated human inhalation exposure risks of polycyclic aromatic hydrocarbons in rural China

Authors: Niu, L; Xu, C; Zhou, Y; Liu, W (2019) HERO ID: 5018043

[Less] Inhalation exposure to atmospheric polycyclic aromatic hydrocarbons (PAHs) is posing a great threat . . . [More] Inhalation exposure to atmospheric polycyclic aromatic hydrocarbons (PAHs) is posing a great threat to human health. Biomass combustion in rural areas contributes greatly to the total PAH emission in China. To conduct a comprehensive risk assessment of ambient PAHs in rural China, a nationwide air sampling campaign was carried out in this study. The 16 U.S. Environmental Protection Agency priority PAHs in tree bark, which was employed as a passive air sampler, were analyzed. The summation of the 16 PAHs ranged from 11.7 to 12,860 ng/m3 in the air of rural China. The national median benzo(a)pyrene equivalent (BaPeq) concentration was 18.4 ng/m3, with the range from 0.334 to 2497 ng/m3. The total inhalation carcinogenic risks of individual PAHs, with the exception for naphthalene, were very low (<1 × 10-6) at most of the sampling sites. The national median excess lifetime lung cancer risk associated with inhalation exposure to atmospheric PAHs was 20.3 × 10-6, corresponding to a population attributable fraction (PAF) of 3.38‰. Our estimations using tree bark were comparable to those reported in other studies and the uncertainties of the variables in the dataset were within the acceptable levels, demonstrating that tree bark is feasible for assessing the atmospheric PAH pollution and associated health risks. We feel that the outputs from this study can assist decision-makers focusing on protecting human health against exposure to atmospheric PAHs in rural China.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

An integrated approach to study novel properties of a MALDI matrix (4-maleicanhydridoproton sponge) for MS imaging analyses

Authors: Corinti, D; Crestoni, ME; Fornarini, S; Pieper, M; Niehaus, K; Giampà, M (2019) HERO ID: 5018048

[Less] The chemical properties accounting for the operation of a valuable matrix used in matrix-assisted laser . . . [More] The chemical properties accounting for the operation of a valuable matrix used in matrix-assisted laser desorption ionization (MALDI) to perform mass spectrometry imaging (MSI), namely 3-(4,5-bis(dimethylamino)napthalen-1-yl)furan-2,5-dione (4-maleicanhydridoproton sponge, MAPS), have been elucidated also by comparison with the parent molecule 1,8-bis(dimethylamino) naphthalene (so-called proton sponge, PS). Both compounds present the bis(dimethylamino) groups, apt to efficiently trap a proton imparting positive charge. Only MAPS, though, owns the maleicanhydrido function acting as electrophile and yielding covalently bound adducts with a variety of analytes. In this way, MAPS performs as "carrier" for the analyte (A) of interest, at the same time minimizing the presence of useless, background ions. The covalent character of the adducts, [MAPS+H + A]+, is testified by their collision-induced dissociation pattern, quite distinct from the one displayed by [PS + H]+, while PS does not form any [PS + H + A]+, thus confirming the key role of the maleicanhydrido functionality of MAPS. Vibrational spectroscopy of [MAPS+H + A]+ adducts (A = H2O, NH3) provided further structural evidence. The presence of a mobile proton on A was found to be a requisite for adduct formation by electrospray ionization of acetonitrile solutions, pointing to a possible role of MAPS in discriminating competing analytes based on molecular features. The performance of MAPS has been verified in MALDI-MSI of Atropa belladonna berries, exploiting MAPS binding to atropine. Graphical abstract ᅟ.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Quantification of the composition of liquid hydrocarbon streams: Comparing the GC-VUV to DHA and GCxGC

Authors: Dunkle, MN; Pijcke, P; Winniford, B; Bellos, G (2019) HERO ID: 5018053

[Less] Hydrocarbons analysis is important in the oil and gas industry, as stream composition has a strong impact . . . [More] Hydrocarbons analysis is important in the oil and gas industry, as stream composition has a strong impact on plant operations. The composition of hydrocarbon streams vary across a plant, which makes the selection of analytical methods challenging. Traditional methods for the evaluation of liquid hydrocarbon streams include the Detailed Hydrocarbon Analysis (DHA); however, non-traditional methods, such as comprehensive gas chromatography (GCxGC), are also utilized in the chemical industry, including Dow. This work details a comparison of analytical techniques available for such analyses, specifically, DHA and GCxGC compared to the recently introduced GC-Vacuum Ultra Violet (GC-VUV) system. Numerous liquid hydrocarbon streams were blended together to generate a composite and extensive matrix in terms of composition. Paraffin, isoparaffin, olefin, naphthene, and aromatic (PIONA) results are presented for the three techniques. All of those methods obtained relative standard deviations lower than 1.3% for five injections a day for three days. Standard addition curves were utilized to accurately quantify specific compounds in a liquid hydrocarbon stream, and these results were compared to the GC-VUV PIONA+ and DHA quantification procedures.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

A novel approach to oxazole-containing diterpenoid synthesis from plant roots: salviamines E and F

Authors: Narita, K; Fujisaki, N; Sakuma, Y; Katoh, T (2019) HERO ID: 5018056

[Less] In this study, salviamines E and F, which are structurally unique abietane-type diterpene alkaloids . . . [More] In this study, salviamines E and F, which are structurally unique abietane-type diterpene alkaloids containing an oxazole ring, were efficiently synthesized from a known molecule, 5,7,8-trimethoxy-1-naphthol. The synthetic sequence involves the following crucial steps: (i) the assembly of a carbon skeleton by coupling a six-carbon homoprenyl unit with a naphthalene moiety (Kumada-Tamao-Corriu coupling); (ii) the construction of a tricyclic phenanthrene ring by acid-induced cyclization of a naphthalene derivative with a homoprenyl side chain; (iii) the formation of an oxazole ring by nucleophilic ring closure of a 2-aminophenylene-1,4-diyl-diformate or -diacetate moiety and (iv) Friedel-Crafts acetylation at the C13 position of the tetracyclic intermediates to obtain the two target molecules, salviamines E and F. To the best of our knowledge, salviamine synthesis is reported here for the first time.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Size-selective encapsulation of C60 and C60-derivatives within an adaptable naphthalene-based tetragonal prismatic supramolecular nanocapsule

Authors: García-Simón, C; Monferrer, A; Garcia-Borràs, M; Imaz, I; Maspoch, D; Costas, M; Ribas, X (2019) HERO ID: 5018057

[Less] A novel naphthalene-based 5·(BArF)8 capsule allows for the size-selective inclusion of C60 from fullerene . . . [More] A novel naphthalene-based 5·(BArF)8 capsule allows for the size-selective inclusion of C60 from fullerene mixtures. Its size selectivity towards C60 has been rationalized by its dynamic adaptability in solution that has been investigated by molecular dynamics. Additionally, 5·(BArF)8 encapsulates C60-derivatives such as C60-PCBM and N-methylpyrrolidine-C60. The latter can be separated from C60 since 5·(BArF)8 displays distinct affinity for them.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

The Comparison of Surface Free Energy of Human, Yucatan Micropig, and Hairless Mouse Skins and Influence of Surfactant on Surface Free Energy of the Skin

Authors: Fujii, M; Kato, K; Imai, M; Kuwabara, H; Awano, M; Hashizaki, K; Taguchi, H (2019) HERO ID: 5018061

[Less] Surface free energy (SFE) is an important factor for evaluation of wettability or adhesion. Thus, the . . . [More] Surface free energy (SFE) is an important factor for evaluation of wettability or adhesion. Thus, the SFE of a Yucatan micropig (YMP) skin and a hairless mouse (HM) skin, which are commonly used in skin permeation studies instead of human skin, were compared with the human skin. Contact angles of water and 1-bromo naphthalene to skin were measured and the SFE was calculated using the Owens-Wendt equation. The SFE of the human abdominal skin was 40 mN/m and its polar component σsp was as low as 2 mN/m, which was similar to that of the low sebum skin reported previously. In the case of the YMP skin, σsp was high on the surface but similar to that obtained after the skin was tape-stripped twice. The HM skin showed similar SFE as that of the human skin. When the surfactant was applied on the skin, wiped, and dried, the remaining surfactant increased the SFE in σsp; however, the original SFE was obtained after rinsing with water. The YMP skin and HM skin is similar to the human abdominal skin with a low sebum level. Thus, they are also good skin models for studying wettability or adhesion of a substance.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Positive Allosteric Control of Guests Encapsulation by Metal Binding to Covalent Porphyrin Cages

Authors: Djemili, R; Kocher, L; Durot, S; Peuronen, A; Rissanen, K; Heitz, V (2019) HERO ID: 5018062

[Less] The allosteric control of the receptor properties of two flexible covalent cages is reported. These . . . [More] The allosteric control of the receptor properties of two flexible covalent cages is reported. These receptors consist of two zinc(II) porphyrins connected by four linkers of two different sizes, each incorporating two 1,2,3-triazolyl ligands. Silver(I) ions act as effectors, responsible for an on/off encapsulation mechanism of neutral guest molecules. Binding silver(I) ions to the triazoles opens the cages and triggers the coordination of pyrazine or the encapsulation of N,N'-dibutyl-1,4,5,8-naphthalene diimide. The X-ray structure of the silver(I)-complexed receptor with short connectors is reported, revealing the hollow structure with a cavity well-defined by two eclipsed porphyrins. Rather unexpectedly, the crystallographic structure of this receptor with pyrazine as a guest molecule showed that the cavity is occupied by two pyrazines, each binding to the zinc(II) porphyrin in a monotopic fashion.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Conformational isomerism controls collective flexibility in metal-organic framework DUT-8(Ni)

Authors: Petkov, PS; Bon, V; Hobday, CL; Kuc, AB; Melix, P; Kaskel, S; Düren, T; Heine, T (2019) HERO ID: 5018063

[Less] Metal-organic frameworks (MOFs) are coordination networks with organic ligands containing potential . . . [More] Metal-organic frameworks (MOFs) are coordination networks with organic ligands containing potential voids. Some MOFs show pronounced structural flexibility that may result in closing and re-opening these pores. Here, we show that collective flexibility in a MOF-DUT-8(Ni) - is controlled by conformational isomerism. DUT-8(Ni), a pillared-layer MOF with Ni2 paddle-wheels, dabco pillars and naphthalene dicarboxylate (ndc) linkers, can crystallize in many conformational isomers that depend on the orientation of the non-linear ndc linkers with respect to each other. While the open form is compatible with several of these conformations, only one of them, with alternating linker orientations, is stable as the closed form. We show, by means of first principles calculations, that in the stable closed form, the appreciable lattice strain is compensated by London-dispersion forces between the ndc linkers that arrange with maximum overlap in a stacking order similar to the stacking in graphite. We substantiate these results by well-tempered metadynamics calculations on the DFT-based Born-Oppenheimer potential energy surface, by refined X-ray diffraction data and by nitrogen adsorption data obtained by experiment and grand-canonical Monte-Carlo simulations based on the DFT-optimized and PXRD-derived geometries. While the reported origin of flexibility cannot be generalized to all flexible MOFs, it offers a rational design concept of folding mechanisms in switchable MOFs by exploitation of the stabilization effect of linker stacking in the closed form.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Body burden of organohalogenated pollutants and polycyclic aromatic hydrocarbons in Romanian population: Influence of age, gender, body mass index, and habitat

Authors: Luzardo, OP; Badea, M; Zumbado, M; Rogozea, L; Floroian, L; Ilea, A; Moga, M; Sechel, G; Boada, LD; Henríquez-Hernández, LA (2019) Science of the Total Environment 656:709-716. HERO ID: 5018064

[Less] Persistent organochlorine pollutants (POPs) are highly lipophilic and resistant to degradation, hence . . . [More] Persistent organochlorine pollutants (POPs) are highly lipophilic and resistant to degradation, hence these substances are commonly found in the environment even decades after their prohibition. The aim of the present study was to determine human serum concentrations of POPs and polycyclic aromatic hydrocarbons (PAHs) in the Romanian population, investigating the role of demographic variables on the body burden of such chemicals. A cross-sectional study including a total of 121 subjects from Brasov (Transylvania region) was designed. The concentration of 62 chemicals, including organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (BDEs) and PAHs, was measured by gas chromatography-mass spectrometry (GC-MS) in the serum of the participants. p,p'-DDE and β-HCH were detected in 100% and 62% of the series (median values = 2.1 and 0.5 μg/L); PCB-153 was detected in 77.7% of the subjects and PCB-28 showed the highest median concentration (0.5 μg/L); BDE-47 was detected at a low concentration in 11.6% of the individuals; phenanthrene and naphthalene were present in 98.3% and 38.8% of the serum samples (median values = 0.9 and 6.5 μg/L, respectively). Age was the main determinant of the total body burden of OCPs and PCBs. A positive correlation was observed between p,p'-DDE and age (Spearman Rho = 0.312, P < 0.0001), suggesting the prevalence of higher levels of pollutants at older ages. The present results showed a significant decrease in serum levels of p,p'-DDE and HCH in Romania -a country which has traditionally reported higher values than other Eastern European countries- as well as low levels of PCBs and BDEs. The presence of PAHs suggests an unknown source of exposure that deserves further investigation.