PubAg

Main content area

You searched for: Publication Year 2018 Remove constraint Publication Year: 2018
Start Over

Search

231,446  Search Results

« Previous | 1 - 20 of 231,446 |
Number of results to display per page

Search Results

1. Agricultural impact and political economy: Niche construction in the Gordion region, central Anatolia

Author:
Kealhofer, Lisa; Marsh, Ben
Source:
Quaternary international 2018
ISSN:
1040-6182
Subject:
case studies; environmental degradation; intensive farming; land use; landscapes; politics; population growth; streams; watersheds; Turkey (country)
Abstract:
... Narratives of societal collapse typically point to environmental degradation as an outcome of population increase or political breakdown. Here we present a case study from Gordion, central Anatolia, spanning the Chalcolithic to Ottoman period (c. 7000 yrs). We use a cultural version of Niche Construction Theory to interpret the timing and nature of landscape change. Recent work in the Gordion regi ...
DOI:
10.1016/j.quaint.2018.12.027

2. Amphiphilic Bottlebrush Block Copolymers: Analysis of Aqueous Self-Assembly by Small-Angle Neutron Scattering and Surface Tension Measurements

Author:
Alaboalirat, Mohammed; Qi, Luqing; Arrington, Kyle J.; Qian, Shuo; Keum, Jong K.; Mei, Hao; Littrell, Kenneth C.; Sumpter, Bobby G.; Carrillo, Jan-Michael Y.; Verduzco, Rafael; Matson, John B.
Source:
Macromolecules 2018 v.52 no.2 pp. 465-476
ISSN:
1520-5835
Subject:
anisotropy; composite polymers; deuterium oxide; micelles; molecular dynamics; molecular weight; nanomaterials; neutron diffraction; polymerization; polystyrenes; simulation models; solvents; surface tension
Abstract:
... A systematic series of 16 amphiphilic bottlebrush block copolymers (BCPs) containing polystyrene and poly(N-acryloylmorpholine) (PACMO) side chains were prepared by a combination of atom-transfer radical polymerization (ATRP), photoiniferter polymerization, and ring-opening metathesis polymerization (ROMP). The grafting-through method used to prepare the polymers enabled a high degree of control o ...
DOI:
10.1021/acs.macromol.8b02366

3. Applicability of the protein-lipid profile and activity of lactate dehydrogenase isoenzymes for diagnosing nutritional muscular dystrophy in calves

Author:
Żarczyńska, Katarzyna; Sobiech, Przemysław; Snarska, Anna; Tobolski, Dawid; Shekhar Pareek, Chandra; Bednarek, Dariusz
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 503-509
ISSN:
2450-8608
Subject:
aspartate transaminase; blood serum; calves; cholesterol; creatine kinase; early diagnosis; glutathione peroxidase; hypocholesterolemia; isozymes; lactate dehydrogenase; lipolysis; muscles; muscular dystrophy; myocytes; protein content; selenium; skeletal muscle; triacylglycerols; vitamin E
Abstract:
... In calves, hyposelenosis degenerates skeletal muscles in different parts of the body. The extent of damage to muscle cells can be diagnosed by determining the activity of creatine kinase (CK), aspartate aminotransferase (AST), and lactate dehydrogenase (LDH). The aim of this study was to analyse variations in the serum levels of LDH isoenzymes in calves with nutritional muscular dystrophy (NMD), t ...
DOI:
10.2478/jvetres-2018-0072

4. Assessing the linkage between dairy productivity growth and climatic variability: The case of New York State

Author:
Ranjan, Alok; Mukherjee, Deep
Source:
Open Agriculture 2018 v.3 no.1 pp. 658-669
ISSN:
2391-9531
Subject:
air temperature; climate change; climatic factors; dairy farming; milk production; models; production functions; soaking; technological change; viability; New York
Abstract:
... Despite the importance of maintaining a high productivity level for the future viability of the dairy sector in the face of changing climate, very few studies have investigated how climatic conditions impact total factor productivity (TFP) growth in dairy farming. In order to bridge this gap in literature, we conducted a TFP decomposition exercise using dairy farm summary records from the New York ...
DOI:
10.1515/opag-2018-0069

5. A Three-Phase Four-Component Coupling Reaction: Selective Synthesis of o-Chloro Benzoates by KCl, Arynes, CO₂, and Chloroalkanes

Author:
Jiang, Huanfeng; Zhang, Yu; Xiong, Wenfang; Cen, Jinghe; Wang, Lu; Cheng, Ruixiang; Qi, Chaorong; Wu, Wanqing
Source:
Organic letters 2018 v.21 no.2 pp. 345-349
ISSN:
1523-7052
Subject:
benzoates; carbon dioxide; chemical reactions; chemical structure; potassium chloride
Abstract:
... A transition-metal-free three-phase four-component coupling reaction (3P-4CR) involving KCl, arynes, chloroalkanes and CO₂ has been reported for the first time, enabling the incorporation of both chloro and CO₂ into an aryne simultaneously. The reactions for the synthesis of different types of o-chloro benzoates can be selectively modulated by the chloroalkane utilized. The corresponding products ...
DOI:
10.1021/acs.orglett.8b03193

6. Avian poxvirus infection in Polish great tits (Parus major)

Author:
Kozdruń, Wojciech; Styś-Fijoł, Natalia; Czekaj, Hanna; Indykiewicz, Piotr; Sandecki, Rafał; Niczyporuk, Jowita Samanta
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 427-430
ISSN:
2450-8608
Subject:
Avipoxvirus; DNA; Parus major; agarose; electrophoresis; financial economics; gels; genes; heart; laboratory experimentation; nucleotide sequences; polymerase chain reaction; poultry; skin lesions; viruses; wild birds; Poland
Abstract:
... Avian poxvirus infections are widespread in the domestic poultry population but are also reported in wild birds. In poultry, these infections cause significant economic losses, while wild birds may be a reservoir for poxvirus which affects breeding poultry. However, wild birds may also exhibit characteristic anatomopathological changes. This study concerns the infection of wild-living great tits ( ...
DOI:
10.2478/jvetres-2018-0065

7. Black Phosphorus Hydrogel Scaffolds Enhance Bone Regeneration via a Sustained Supply of Calcium-Free Phosphorus

Author:
Huang, Keqing; Wu, Jun; Gu, Zhipeng
Source:
ACS applied materials & interfaces 2018 v.11 no.3 pp. 2908-2916
ISSN:
1944-8252
Subject:
animal models; biomineralization; bone formation; bones; calcium; encapsulation; engineering; gelatin; hydrogels; ions; nanosheets; phosphates; phosphorus; rabbits; stem cells; tooth pulp; transcription factors
Abstract:
... Effective bone regeneration remains a challenge for bone-tissue engineering. In this study, we propose a new strategy to accelerate bone regeneration via a sustained supply of phosphorus without providing foreign calcium. Herein, a black phosphorus nanosheet (BPN)-based hydrogel platform was developed, and the BPNs were used to stably and mildly provide phosphorus. The hydrogel was fabricated by p ...
DOI:
10.1021/acsami.8b21179

8. Building Covalent Molecular Capsules by Thiol-Michael Addition Click Reaction

Author:
Perretti, Marcelle D.; Pérez-Márquez, Lidia A.; García-Rodríguez, Raúl; Carrillo, Romen
Source:
Journal of organic chemistry 2018 v.84 no.2 pp. 840-850
ISSN:
1520-6904
Subject:
chemical reactions; chemical structure; organic chemistry; organic compounds
Abstract:
... The thiol-Michael addition (TMA) is a powerful methodology to click several fragments together, despite having been underestimated in the synthesis of complex systems for supramolecular chemistry. Herein, a very fast and efficient method has been developed to make covalent molecular capsules by taking advantage of the TMA click reaction. Several scaffolds commonly used in supramolecular chemistry, ...
DOI:
10.1021/acs.joc.8b02677

9. Cell viability in normal fibroblasts and liver cancer cells after treatment with iron (III), nickel (II), and their mixture

Author:
Terpiłowska, Sylwia; Siwicka-Gieroba, Dorota; Siwicki, Andrzej Krzysztof
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 535-542
ISSN:
2450-8608
Subject:
biocompatible materials; cell viability; fibroblasts; human cell lines; industry; iron; liver neoplasms; metabolism; mitochondria; neoplasm cells; nickel; synergism; toxicity
Abstract:
... Nickel and iron are very commonly occurring metals. Nickel is used in industry, but nowadays it is also used in medical biomaterials. Iron is an element necessary for cell metabolism and is used in diet supplements and biomaterials, whence it may be released along with nickel. BALB/3T3 and HepG2 cells were incubated with iron chloride or nickel chloride at concentrations ranging from 100 to 1,400 ...
DOI:
10.2478/jvetres-2018-0067

10. β-Chloroaldehydes from Trapping Zirconium Enolates Produced in Asymmetric 1,4-Additions

Author:
Wang, Jiao Yu Joseph; Palacin, Thomas; Fletcher, Stephen P.
Source:
Organic letters 2018 v.21 no.2 pp. 378-381
ISSN:
1523-7052
Subject:
Lewis bases; carbon; chemical reactions; chemical structure; enantioselectivity; organic compounds; zirconium
Abstract:
... Zirconium enolates, derived from copper-catalyzed asymmetric conjugate additions, are trapped with the Vilsmeier–Haack reagent. Asymmetric additions generate quaternary carbon centers with high enantioselectivity (generally ∼90% ee), and the enolates are converted to unsaturated β-chloroaldehydes (41–57% yields). The reaction tolerates changes to the nucleophile, can be used to form five-, six-, o ...
DOI:
10.1021/acs.orglett.8b03520

11. Climate change in Upper East Region of Ghana; challenges existing in farming practices and new mitigation policies

Author:
Fagariba, Clifford James; Song, Shaoxian; Baoro, Serge Kévin Gildas Soule
Source:
Open Agriculture 2018 v.3 no.1 pp. 524-536
ISSN:
2391-9531
Subject:
case studies; climate change; crop rotation; drought; extension education; farmers; farming systems; focus groups; fossil fuels; fuel combustion; greenhouse gases; humans; international organizations; irrigation; land use change; livelihood; meteorological data; planting date; regression analysis; subsidies; surveys; temperature; transportation; Ghana
Abstract:
... Countries and international organizations are making conscious effort to address climate change threat to humanity. Rising fossil fuel burning and land use changes to meet human demands continuously emit large quantities of greenhouse gases into the atmosphere thus causing climate change. The research used Talensi District as a case study to determine factors influencing farmers’ adaptation respon ...
DOI:
10.1515/opag-2018-0057

12. Comparison of Fe, Zn, Mn, Cu, Cd and Pb concentration in spruce needles collected in the area of Gdansk and Gdynia in Northern Poland

Author:
Konieczyński, Paweł; Moszczyński, Jan; Wesołowski, Marek
Source:
Ochrona Środowiska i Zasobów Naturalnych 2018 v.29 no.4 pp. 1-9
ISSN:
2353-8589
Subject:
atomic absorption spectrometry; cadmium; conifer needles; copper; elemental composition; iron; lead; manganese; monitoring; principal component analysis; quantitative analysis; soil; soil sampling; toxicity; variance; zinc; Poland
Abstract:
... The aim of the investigation was to assess the utility of spruce needles as a potential material to be used for monitoring the contamination level of the environment of Tricity agglomeration (represented by Gdansk and Gdynia). This aim was realized by determining the levels of selected essential elements indispensable for the life of living organisms, such as Fe, Zn, Mn and Cu, as well as toxic, n ...
DOI:
10.2478/oszn-2018-0015

13. Contamination of bottom sediments by lead, zinc and cadmium in Rzeszow reservoir

Author:
Maj-Zajezierska, Katarzyna; Koszelnik, Piotr
Source:
Ochrona Środowiska i Zasobów Naturalnych 2018 v.29 no.4 pp. 10-15
ISSN:
2353-8589
Subject:
cadmium; heavy metals; lead; risk; rivers; sediments; zinc; Poland
Abstract:
... The aim of the present study was to determine the level of contamination of the bottom sediments in the Rzeszow reservoir by the selected heavy metals Pb, Cd and Zn, and to identify the potential environmental risks of heavy metals content basing on available assessments and classification of bottom sediments. The Rzeszow reservoir is situated on the Wisłok River in the Podkarpackie Voivodeship, s ...
DOI:
10.2478/oszn-2018-0016

14. Control of residues of thyreostats in slaughter animals in Poland in 2011–2017

Author:
Woźniak, Barbara; Matraszek-Żuchowska, Iwona; Sielska, Katarzyna; Witek, Sebastian; Posyniak, Andrzej; Niemczuk, Krzysztof; Żmudzki, Jan
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 511-517
ISSN:
2450-8608
Subject:
Brassicaceae; European Union; cattle; compliance; diet; drinking water; drugs; farms; finishing; liquid chromatography; methylthiouracil; muscles; propylthiouracil; slaughter; slaughterhouses; swine; tandem mass spectrometry; thiouracil; urine; Poland
Abstract:
... In the European Union, the use of thyreostatic drugs for fattening slaughter animals has been banned since 1981 under Council Directive 81/602/EEC. For protection of consumer health against unwanted residues and in compliance with Directive 96/23, each EU country must monitor thyreostats in samples of animal origin. This paper presents the results of research on thyreostatic residues carried out i ...
DOI:
10.2478/jvetres-2018-0077

15. Coupled Sulfur and Iron(II) Carbonate-Driven Autotrophic Denitrification for Significantly Enhanced Nitrate Removal

Author:
Zhu, Ting-ting; Cheng, Hao-yi; Yang, Li-hui; Su, Shi-gang; Wang, Hong-cheng; Wang, Shu-sen; Wang, Ai-jie
Source:
Environmental science & technology 2018 v.53 no.3 pp. 1545-1554
ISSN:
1520-5851
Subject:
biomass; carbonates; chemical oxygen demand; denitrification; iron; leaching; limestone; liquids; nitrates; nitrites; nitrous oxide; risk; sulfates; sulfur; synergism
Abstract:
... Sulfur-based denitrification process has attracted increasing attentions because it does not rely on the external addition of organics and avoids the risk of COD exceeding the limit. Traditionally, limestone is commonly employed to maintain a neutral condition (SLAD process), but it may reduce the efficiency as the occupied zone by limestone cannot directly contribute to the denitrification. In th ...
DOI:
10.1021/acs.est.8b06865

16. Cytological evaluation of the influence of high and low doses of bisphenol A on an erythroblastic cell line of porcine bone marrow

Author:
Snarska, Anna; Wysocka, Dominika; Rytel, Liliana; Makowska, Krystyna; Gonkowski, Sławomir
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 543-547
ISSN:
2450-8608
Subject:
adverse effects; anemia; bisphenol A; bone marrow; cell lines; compact discs; epoxides; erythrocytes; hematopoiesis; humans; polyphenols; resins; swine; toxicity; xenoestrogens
Abstract:
... Bisphenol A (BPA) is a substance widely used in industry for the production of polycarbonates and epoxy resins used in packaging and containers for beverages, contact lenses, compact discs (CDs), window panes, and many other elements. This compound belongs to the group of polyphenols and xenoestrogens commonly found in the human environment. What we know about BPA is still insufficient to enable u ...
DOI:
10.2478/jvetres-2018-0068

17. Cytotoxicity of iron (III), molybdenum (III), and their mixtures in BALB/3T3 and HepG2 cells

Author:
Terpiłowska, Sylwia; Siwicka-Gieroba, Dorota; Siwicki, Andrzej Krzysztof
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 527-533
ISSN:
2450-8608
Subject:
DNA; cell proliferation; cell viability; cytotoxicity; enzymes; human cell lines; iron; metabolism; molybdenum; neoplasm cells; neoplasms; synergism
Abstract:
... Iron and molybdenum are essential trace elements for cell metabolism. They are involved in maintaining proper functions of enzymes, cell proliferation, and metabolism of DNA. BALB/3T3 and HepG2 cells were incubated with iron chloride or molybdenum trioxide at concentrations from 100 to 1,400 μM. The cells were also incubated in mixtures of iron chloride at 200 μM plus molybdenum trioxide at 1,000 ...
DOI:
10.2478/jvetres-2018-0066

18. Detection of bovine respiratory syncytial virus, Pasteurella multocida, and Mannheimia haemolytica by immunohistochemical method in naturally-infected cattle

Author:
Yaman, Turan; Büyükbayram, Hüseyin; Özyıldız, Zafer; Terzi, Funda; Uyar, Ahmet; Keles, Ömer Faruk; Özsoy, Şule Yurdagül; Yener, Zabit
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 439-445
ISSN:
2450-8608
Subject:
Bovine orthopneumovirus; Mannheimia haemolytica; Pasteurella multocida; bronchioles; cattle; cattle diseases; cytoplasm; enzymes; epithelial cells; formalin; immunohistochemistry; pathogens; pneumonia; slaughterhouses; viral antigens
Abstract:
... The aim of this study was to determine the predisposing effect of bovine respiratory syncytial virus (BRSV) on Pasteurella spp. infection in naturally-induced pneumonia in cattle by immunohistochemical labelling. Lungs of cattle slaughtered in the slaughterhouse were examined macroscopically, and 100 pneumonic samples were taken. The samples were fixed in 10% neutral formalin and embedded in paraf ...
DOI:
10.2478/jvetres-2018-0070

19. Development of a new RT-PCR with multiple primers for detecting Southern African Territories foot-and-mouth disease viruses

Author:
Liu, Ya-Li; Ding, Yao-Zhong; Dai, Jun-Fei; Ma, Bing; He, Ji-Jun; Ma, Wei-Min; Lv, Jian-Liang; Ma, Xiao-Yuan; Ou, Yun-Wen; Wang, Jun; Liu, Yong-Sheng; Chang, Hui-Yun; Wang, Yong-Lu; Zhang, Qiang; Liu, Xiang-Tao; Zhang, Yong-Guang; Zhang, Jie
Source:
Journal of Veterinary Research 2018 v.62 no.4 pp. 431-437
ISSN:
2450-8608
Subject:
Enterovirus B; Foot-and-mouth disease virus; Seneca Valley virus; cattle; disease outbreaks; genes; genetic variation; goats; monitoring; oligodeoxyribonucleotides; pathogens; reverse transcriptase polymerase chain reaction; screening; serotypes; sheep; swine; viruses; China; Southern Africa
Abstract:
... The extremely high genetic variation and the continuously emerging variants of foot-and-mouth disease virus (FMDV) of Southern African Territory (SAT) serotypes including SAT1, SAT2, and SAT3 make it necessary to develop a new RT-PCR for general use for monitoring viruses based on the updated genome information. A FMDV SAT-D8 one-step RT-PCR was established based on the 1D2A2B genes of the SAT ser ...
DOI:
10.2478/jvetres-2018-0064

20. Dietary glycemic index and glycemic load in relation to general obesity and central adiposity among adults

Author:
Salari-Moghaddam, Asma; Keshteli, Ammar Hassanzadeh; Haghighatdoost, Fahimeh; Esmaillzadeh, Ahmad; Adibi, Peyman
Source:
Clinical nutrition 2018
ISSN:
0261-5614
Subject:
adiposity; adults; body mass index; cross-sectional studies; developing countries; food frequency questionnaires; gender; glycemic index; men; obesity; waist circumference; women; Iran
Abstract:
... Although the association between dietary Glycemic Index (GI), Glycemic Load (GL) and general/abdominal obesity has extensively been examined, limited data are available in this regard in developing countries. The aim of this study was to examine the association between dietary GI and GL with general and abdominal obesity.This cross-sectional study was conducted among adults in Isfahan, Iran. Dieta ...
DOI:
10.1016/j.clnu.2018.12.036