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Lana NB, Berton P, Covaci A, Ciocco NF, Barrera-Oro E, Atencio A, Altamirano JC. Fingerprint of persistent organic pollutants in tissues of Antarctic notothenioid fish. Sci Total Environ 2014; 499:89-98. [PMID: 25173865 DOI: 10.1016/j.scitotenv.2014.08.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 08/08/2014] [Accepted: 08/10/2014] [Indexed: 05/22/2023]
Abstract
In the present work, persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and metabolites, polybrominated diphenyl ethers (PBDEs), and hexachlorocyclohexane (HCH) were analyzed in three Antarctic notothenioids fish species: Trematomus newnesi (TRN), Notothenia coriiceps (NOC) and Notothenia rossii (NOR). The contribution of each POP-family to the total load was as follows: ΣPCB (40%)>ΣDDT (27%)>ΣPBDEs (23%)>ΣHCH (10%). Among the 23 PCB congeners analyzed, penta-CBs homologues were the prevalent group, followed by hexa-CBs and hepta-CBs. DDT and its metabolites presented the following trend: p,p'-DDT>p,p'-DDE~p,p'-DDD. PBDE profile was dominated by BDE-47 and BDE-99 congeners, followed by BDE-100>BDE-28>BDE-154, BDE-153. Among HCHs, the γ-HCH isomer was detected in all samples, constituting 69% total HCH load, while α-HCH and β-HCH contributions were 15% and 16%, respectively. The levels of POPs reported here suggest that NOR and NOC are more susceptible to accumulate the analyzed contaminants than TRN, a species not previously analyzed for POPs. Distribution of POPs among different tissues of the three species (muscle, liver, gonads, and gills) was also investigated. Considering lipid weight, the general pattern of POPs distribution in tissues indicated that while gonads showed higher levels of PCBs, DDTs and HCH, the most significant PBDE concentrations were recorded in gills. Also, a comparative analysis of POPs concentration in fish samples from Antarctic area was included.
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Affiliation(s)
- Nerina B Lana
- Laboratorio de Química Ambiental, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA)-CONICET, Mendoza, P.O. Box 131 ZC5500, Mendoza, Argentina
| | - Paula Berton
- Laboratorio de Química Ambiental, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA)-CONICET, Mendoza, P.O. Box 131 ZC5500, Mendoza, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Adrian Covaci
- Toxicological Center, Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Néstor F Ciocco
- Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina; Instituto Argentino de Investigación de Zonas Áridas (IADIZA)-CONICET, Mendoza, Argentina
| | - Esteban Barrera-Oro
- Instituto Antártico Argentino (IAA), Buenos Aires, Argentina; Museo Argentino de Ciencias Naturales Bernardino Rivadavia-CONICET, Buenos Aires, Argentina
| | - Adrián Atencio
- Laboratorio de Estratigrafía Glaciar y Geoquímica del Agua y la Nieve (LEGAN)-IAA-CONICET, Mendoza, Argentina
| | - Jorgelina C Altamirano
- Laboratorio de Química Ambiental, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA)-CONICET, Mendoza, P.O. Box 131 ZC5500, Mendoza, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.
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Abstract
A mechanism for separating chiral molecules is proposed. The separation of two enantiomers in an aquifer is considered. The molecules are dragged in the aquifer porous medium by a flow of water or of another liquid. The molecule velocity is u=v/R, where v is the liquid velocity, and R is the retardation factor. The aquifer consists of two one-dimensional layers disposed in series. The layers differ by the retardation factor or by the liquid velocity. The enantiomer velocity is a function of the enantiomer concentrations. This function is different in the two layers. For certain values of the model parameters and when the molecules entering the aquifer are enantiomerically enriched or when the medium is chiral, the concentration of one enantiomer increases around the interface between the two layers and in one layer, whereas the concentration of the other enantiomer decreases. Enantiomer synthesis and decay are not taken into account. The needed values of the parameters can be obtained when the enantiomers are moved by an alternating liquid flow, and the retardation factor oscillates in synchronism with the alternating liquid flow. The parameters of the model are then understood as quantities averaged over one oscillation period. The equations that give the values of the stationary concentrations of the enantiomers are found. The evolution of the enantiomer concentrations is determined by numerically solving a system of two nonlinear advection-dispersion equations. The proposed mechanism may have played a role in the emergence of biomolecular homochirality.
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Affiliation(s)
- A Atencio
- Institute of Spectroscopy, Russian Academy of Science, 142190, Troitsk, Moscow Region, Russia.
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Liem A, Pesti G, Atencio A, Edwards H. Experimental approach to optimize phytate phosphorus utilization by broiler chickens by addition of supplements. Poult Sci 2009; 88:1655-65. [DOI: 10.3382/ps.2008-00481] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
An experiment was conducted with 25- to 66-wk-old Ross broiler breeders in an environment excluding ultraviolet light to determine the cholecalciferol (D3) requirements for hen day egg production; hatchability; body weight of the progeny at 1 d; embryo mortality during the early (1 to 10 d of incubation), middle (11 to 15 d of incubation), and late stages (16 to 21 d of incubation) of development; egg weight; specific gravity; and body ash of the progeny at 1 d of age. Five levels of vitamin D3 (125, 250, 500, 1,000, and 2,000 IU/kg of diet) were fed to hens from 25 to 66 wk of age. One additional group was fed no supplemental D3 until 36 wk of age and was then changed to 4,000 IU/kg of diet. Separate regression analyses were performed for wk 27 to 36 (peak original design) and for wk 37 to 66 (postpeak production modified design). The D3 levels for the predicted maximum hen day egg production during peak and postpeak were 1,424 and 2,804 IU/kg, respectively. The D3 levels for the predicted maximum hatchability were 1,390 IU/ kg (peak) and 2,708 IU/kg (postpeak). The level of D3 that resulted in the minimum early embryo mortality was 1,288 IU/kg at peak; however, no significant effect was observed at postpeak. The D3 levels for minimum middle stage embryo mortality were 1,130 IU/kg (peak) and 2,568 IU/kg (postpeak) and for late stage embryo mortality were 1,393 IU/kg (peak) and 2,756 IU/kg (postpeak). The D3 level for maximum egg weight was 1,182 IU/kg (peak) and for specific gravity was 1,337 IU/kg (peak) and >2,000 IU/kg (postpeak). The D3 level for maximum body ash of progeny at d 1 was >2,000 IU/kg. Analysis of the data from the original design of the experiment (treatments providing 0, 125, 250, 500, 1,000, and 2,000 IU of vitamin D3/kg for the 27- to 36-wk-old birds) indicates a requirement of approximately 1,400 IU of D3/kg of feed for broiler breeder hens. When the data from the modified experiment (37 to 66 wk of age) include conversion of the treatment provided at 0 IU of D3/kg to a treatment providing 4,000 IU of D3/kg, the requirement may be approximately 2,800 IU of D3/kg.
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Affiliation(s)
- A Atencio
- Department of Poultry Science, University of Georgia, Athens 30602, USA
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Driver JP, Atencio A, Edwards HM, Pesti GM. Improvements in Nitrogen-Corrected Apparent Metabolizable Energy of Peanut Meal in Response to Phytase Supplementation. Poult Sci 2006; 85:96-9. [PMID: 16493951 DOI: 10.1093/ps/85.1.96] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A study was conducted to investigate the effect of phytase on the AMEn of peanut meal. One hundred twenty Ross x Ross broiler chicks of mixed sex were fed one of 4 experimental diets from 5 to 15 d of age. Diets used were Diet 1, a low P corn-soybean based basal diet; Diet 2, a 50% basal + 50% peanut meal diet; Diet 3, the basal diet supplemented with 24,000 phytase units (FTU) of Natuphos 5000 phytase/kg; and Diet 4, a phytase-supplemented 50% basal + 50% peanut meal diet. Chromic oxide was added to the basal diet at 0.1% as an indigestible marker. Apparent metabolizable energy was determined by substituting peanut meal at the expense of the basal diet. Other parameters measured included the phytate content of the diets as well as phytate P disappearance. Phytase significantly improved phytate P disappearance for both the corn and soybean meal basal diet (23.8 to 93.7%) as well as the 50% basal + 50% peanut meal diet (16.7 to 89.5%). Phytase increased the AMEn of peanut meal on a DM basis by approximately 9%, from 3,209 to 3,559 kcal/kg.
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Affiliation(s)
- J P Driver
- Department of Poultry Science, University of Georgia, Athens 30602-2772, USA.
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Driver JP, Atencio A, Pesti GM, Edwards HM, Bakalli RI. The Effect of Maternal Dietary Vitamin D3 Supplementation on Performance and Tibial Dyschondroplasia of Broiler Chicks. Poult Sci 2006; 85:39-47. [PMID: 16493944 DOI: 10.1093/ps/85.1.39] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A series of experiments was conducted to investigate the effects of maternal dietary vitamin D3 supplementation at 4 different times during the laying cycle, on the performance and bone quality of broiler chicks fed a diet that induced tibial dyschondroplasia (TD) or an adequate diet. Ross x Ross broiler breeder hens were fed a corn-soy diet with various levels of vitamin D3 from 24 to 66 wk of age. Eggs were collected at 39, 44, 53, and 64 wk of age and hatched. Chicks from hens fed 250 IU of D3/kg (low maternal D3 or LMD3) and 2,000 IU of D3/ kg (high maternal D3 or HMD3) levels were placed in battery brooders and fed the diets from 0 to 16 d. At 16 d, the chicks were weighed and killed; the left tibias were used for bone ash determinations, and the right tibias were used to score the incidence and severity of TD (0, 1, 2, or 3, where 3 is the most severe). Body weight gain and feed intake were significantly lower for the LMD3 chicks at wk 44 and 64, although there was no difference in weight at hatch. For the first 2 hatches (wk 39 and 44), the LMD3 and HMD3 chicks demonstrated high average TD scores (2.03 and 1.57 vs. 2.05 and 1.75 for the LMD3 vs. HMD3 chicks, respectively) and high average incidences of severe TD (50 and 35% vs. 45 and 34% for LMD3 vs. HMD3 levels, respectively). However, results from the last 2 hatches (wk 53 and 64) showed that HMD3 chicks, compared with LMD3 chicks, had reduced average TD scores (1.39 and 1.47 vs. 1.01 and 0.44 for LMD3 vs. HMD3 levels, respectively) and severe TD incidence (36 and 40% vs. 17 and 8% for the LMD3 vs. HMD3 levels, respectively). In this experiment, as egg production declined toward the end of the laying cycle, hens fed the HMD3 might have been able to deposit sufficient quantities of vitamin D3 in the egg to maintain excellent body weight gain at 16 d of age and reduce the incidence and severity of TD. Hens fed the LMD3 diet were unable to produce similar improvements.
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Affiliation(s)
- J P Driver
- Department of Poultry Science, University of Georgia, Athens 30602-2772, USA.
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Atencio A, Edwards HM, Pesti GM. Effect of the level of cholecalciferol supplementation of broiler breeder hen diets on the performance and bone abnormalities of the progeny fed diets containing various levels of calcium or 25-hydroxycholecalciferol. Poult Sci 2005; 84:1593-603. [PMID: 16335129 DOI: 10.1093/ps/84.10.1593] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Four experiments were conducted using Ross x Ross chicks hatched from broiler breeder hens fed various levels of cholecalciferol (vitamin D3; 0 to 4,000 IU/kg of diet) to determine the effect of the maternal diet on the performance and leg abnormalities of the progeny. Chicks hatched from eggs laid by the hens at different ages were used in experiments 1 to 4. The studies were conducted in an ultraviolet light-free environment as split plot designs, with Ca levels or 25-hydroxycholecalciferol (25-OHD3) in the chicks' diet as the whole plot, and vitamin D3 in the maternal diet as a subplot. Chicks in experiments 1 and 2 were fed 2 levels of Ca (0.63% or 0.90%) and chicks in experiments 3 and 4 were fed 6 levels of 25-OHD3 (0 to 40 microg/kg of diet). Significant increases in body weight gain (BWG) of the progeny were observed in experiments 1, 2, and 4 as the vitamin D3 level in the maternal diet increased. Chicks hatched from eggs laid by hens fed the highest levels of D3 had the highest tibia ash. Significant reductions in Ca rickets incidence (experiments 1 and 2) and tibial dyschondroplasia (TD) incidence (experiment 1) were observed as the level of vitamin D3 in the maternal diet increased. Chicks fed lower levels of Ca had lower BWG and tibia ash and higher incidences of TD and Ca rickets than chicks fed higher levels of Ca. Increasing the level of 25-OHD3 in the chicks' diet significantly improved BWG, tibia ash, and plasma Ca and reduced TD and Ca rickets incidence. An overall evaluation of the study indicates that chicks from hens fed the highest levels of vitamin D3 and fed high levels of Ca or 25-OHD3 had the highest BWG, tibia ash, and plasma Ca, and the lowest incidences of TD and Ca rickets.
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Affiliation(s)
- A Atencio
- Department of Poultry Science, University of Georgia 30602, USA
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Atencio A, Pesti GM, Edwards HM. Twenty-five hydroxycholecalciferol as a cholecalciferol substitute in broiler breeder hen diets and its effect on the performance and general health of the progeny. Poult Sci 2005; 84:1277-85. [PMID: 16156212 DOI: 10.1093/ps/84.8.1277] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
An experiment was conducted with broiler breeder hens to determine the relative biological value of 25-hydroxycholecalciferol (25-OHD3) compared with cholecalciferol (vitamin D3) for hen-day egg production, hatchability, embryo mortality (early, 1 to 10 d of incubation, late, 11 to 21 d), and body ash of the progeny. The study was conducted with 73-to-90-wk-old molted Ross broiler breeder hens in an environment excluding ultraviolet light. A basal vitamin D3 deficient diet supplemented with 4 levels of vitamin D3 (0, 3,125, 12,500, and 50,000 ng/kg of diet) and 2 levels of 25-OHD3 (3,125 and 12,500 ng/kg of diet) was fed. The relative biological values of 25-OHD3 in comparison to vitamin D3, using slope ratio techniques, were 138, 133, 128, and 111% for hen-day egg production, hatchability, late embryo mortality, and body ash of the progeny,, respectively (average = 128%). When comparing 25-OHD3 against D3 at the 3,125 ng/kg level, the relative biological values were 209, 167, 400, and 108% for the same criteria, respectively (average = 221%). However, at the 12,500 ng/kg level no statistical differences between 25-OHD3 and D3 were observed (average = 108%). Four trials were conducted to determine the effect of the maternal diet on the performance and leg abnormalities of the hens' progeny. In experiment 1, no vitamin D was added to the corn-soybean meal basal diet fed to the chicks, and in experiments 2, 3, and 4 the basal diet was supplemented with 27.5 microg of D3/kg of diet. In the progeny study, the average relative biological value of 25-OHD3 at the 3,125 and 12,500 ng/kg levels were 115 and 101%, respectively. The potency of 25-OHD3 in relation to vitamin D3 depended on the level tested. When comparing vitamin D sources, 25-OHD3 had greater potency than D3 only at very low levels of supplementation.
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Affiliation(s)
- A Atencio
- Department of Poultry Science, Poultry Science Building, University of Georgia, Athens, Georgia 30602-2772, USA
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Atencio A, Edwards HM, Pesti G. Effects of vitamin D3 dietary supplementation of broiler breeder hens on the performance and bone abnormalities of the progeny. Poult Sci 2005; 84:1058-68. [PMID: 16050123 DOI: 10.1093/ps/84.7.1058] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Six experiments were conducted using Ross x Ross chicks hatched from eggs laid by broiler breeder hens fed various levels of vitamin D3 (0 to 4,000 IU/kg of diet) to determine the effects of vitamin D3 level in the maternal diet on the performance and leg abnormalities of their progeny. Chicks hatched from eggs laid when hens were 27, 41, 29, 36, 45, and 52 wk of age were used in experiments 1, 2, 3, 4, 5, and 6, respectively. The studies were conducted in a ultraviolet (UV)-light-free environment. Experiments 1 and 2 were conducted as complete randomized designs with the maternal diets as the treatments, and experiments 3, 4, 5, and 6 were conducted as split plot designs, with vitamin D3 in the chick diets as the whole plot and vitamin D3 in the maternal diet as a subplot. Chicks in experiments 1 and 2 were fed a vitamin D3-deficient diet, whereas chicks in experiments 3 and 4 were fed 4 levels of vitamin D3 (0 to 400 IU/kg of diet), and chicks in experiments 5 and 6 were fed 6 levels of vitamin D3 (0 to 3,200 IU/kg of D3). The highest body weight gains and tibia ash were observed in chicks hatched from hens fed the highest levels of vitamin D3 in all experiments. Reductions in the incidence of Ca rickets were observed in experiments 3 and 6, whereas increases in tibia ash were observed in experiments 2 and 6 as the level of vitamin D3 in the maternal diet increased. Body weight gain and tibia ash increased and Ca rickets incidence decreased as the vitamin D3 level in chick diets increased. An evaluation of the study indicates that chicks hatched from eggs laid by hens fed 2,000 or 4,000 IU of D3/kg as the maximum level of vitamin D3 had the highest body weight gains, and chicks fed 3,200 IU had the highest body weight and tibia ash and the lowest TD and Ca rickets incidences.
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Affiliation(s)
- A Atencio
- Department of Poultry Science, University of Georgia, Athens, Georgia 30602, USA
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Landaeta-Hernández AJ, Palomares-Naveda R, Soto-Castillo G, Atencio A, Chase CC, Chenoweth PJ. Social and breed effects on the expression of a PGF2alpha induced oestrus in beef cows. Reprod Domest Anim 2005; 39:315-20. [PMID: 15367263 DOI: 10.1111/j.1439-0531.2004.00515.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Social organization and breed effects following PGF2alpha were studied in mature Angus, Brahman and Senepol cows allocated into two groups (each A = 5, B = 5 and S = 5). Variables including interval to oestrus onset (IEO), oestrous duration (DE), total mounts received (TMR), and oestrous intensity (IE) were derived via HeatWatch. Breed-type influenced IEO (B = 42.6 +/- 6.7 h; S = 54.6 +/- 6.0 h; and A = 27.8 +/- 5.8 h; p < 0.003). Within breeds, dominant B (69.4 +/- 13.3 h) and S (65.5 +/- 7.4 h) cows were slower (p < 0.05) to be detected in oestrus than subordinate (38.1 +/- 4.4 h) and intermediate (40.6 +/- 6.0 h). However, within A, dominant cows (16.4 +/- 12.5 h) were detected in oestrus earlier (p < 0.05) than intermediate (44.3 +/- 9.2 h) and subordinates (32.7 +/- 5.1 h). Angus (21.5 +/- 2.4 h) and B (22.1 +/- 3.0 h) cows had longer (p < 0.01) DE than S (9.1 +/- 2.8 h). Dominants (20.4 +/- 3.0) and intermediates (20.2 +/- 2.3 h) cows had longer DE (p < 0.04) than subordinates (12.1 +/- 2.1 h) although the interaction breed x social order showed that dominant S had shorter DE than dominant A and B (10.1 +/- 3.3; 34.8 +/- 6.0 h; and 20.0 +/- 6.4 h, respectively; p < 0.001). Angus cows had less TMR than B (p < 0.02) and tended to be less than S cows (p < 0.06). Overall, greatest (p < 0.008) IE occurred in the first 9 h after onset of oestrus with no breed effect (p > 0.05). Dominant cows tended (p < 0.10) to have less TMR (3.2 +/- 0.7 mounts) than subordinate (4.1 +/- 0.4 mounts) and intermediate (4.7 +/- 0.6 mounts) throughout, especially 3-6 h after oestrus onset (p < 0.07). Breed and social order both influence PGF2alpha-induced oestrus behaviour.
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Affiliation(s)
- A J Landaeta-Hernández
- Facultad de Ciencias Veterinarias, Universidad del Zulia, Av Guajira, Ciudad Universitaria. Maracaibo, Venezuela.
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Abstract
Ultrasonic evaluation of the vitreous body augments and complements visual and clinical assessment in any condition in which some form of media opacity exists, eg, cornea, lens, hemorrhage, or subretinal mass. The appearance of the eye in hypotony, the presence of foreign material, the pattern of hemorrhage, and the presence of a detached retina or choroid are all identifiable and their diagnosis may be of critical importance to patient management. Patterns of diabetic retinopathy and ocular tumors are usually characteristic using conventional 10 MHz ultrasound. The use of Very High Frequency (VHF or UBM) ultrasound can identify ciliary body detachment or other retroiridal pathology, such as tumors and cysts.
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Affiliation(s)
- D J Coleman
- Department of Ophthalmology, Margaret M. Dyson Vision Research Institute, Cornell University Medical College, New York, NY 10021, USA
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Moore-West M, West DA, Obenshain SS, Atencio A. Factors influencing minority students' choice of medicine as a career. J Med Educ 1984; 59:523. [PMID: 6726777 DOI: 10.1097/00001888-198406000-00015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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