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Croatica Chemica Acta最新文献

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A Historical Perspective on Crystallography in Croatia and the Career of Biserka Kojić-Prodić from the Viewpoint of the CSD 从CSD的角度看克罗地亚晶体学和比塞卡的职业生涯Kojić-Prodić
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3342
P. Wood, Clare A Tovee, Andrew G. P. Maloney, S. Ward
{"title":"A Historical Perspective on Crystallography in Croatia and the Career of Biserka Kojić-Prodić from the Viewpoint of the CSD","authors":"P. Wood, Clare A Tovee, Andrew G. P. Maloney, S. Ward","doi":"10.5562/CCA3342","DOIUrl":"https://doi.org/10.5562/CCA3342","url":null,"abstract":"There is a long history of chemical crystallography and use of the Cambridge Structural Database (CSD) in Croatia, which dates back to 1985 when the CSD first became accessible there thanks to the efforts of Biserka Kojić-Prodić as head of the National Affiliated Centre. On the occasion of Dr Kojić-Prodić’s 80th birthday we take the opportunity to look back at the history of crystallography in Croatia, and particularly in Biserka’s career, from the point of view of the CSD. Biserka has been a prolific author and contributor of crystal structures over the years sharing over 400 structures and collaborating with over 270 different co-authors on a wide range of different types of structure.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"149-152"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47546941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Role of Phosphate Binding in Purine Nucleoside Phosphorylase of Helicobacter pylori 磷酸结合在幽门螺杆菌嘌呤核苷磷酸化酶中的作用
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3335
Marta Bošnjaković, Ivana Leščić Ašler, Z. Štefanić
{"title":"The Role of Phosphate Binding in Purine Nucleoside Phosphorylase of Helicobacter pylori","authors":"Marta Bošnjaković, Ivana Leščić Ašler, Z. Štefanić","doi":"10.5562/CCA3335","DOIUrl":"https://doi.org/10.5562/CCA3335","url":null,"abstract":"Purine nucleoside phosphorylase (PNP) is an essential enzyme in the purine salvage pathway of Helicobacter pylori. Since H. pylori lacks the ability to synthesize purine nucleosides de novo, inhibition of this enzyme could stop the growth of this bacterium. However, for the design of successful inhibitors the details of the mechanism of this enzyme should be fully understood. PNPs catalyze cleavage of the glycosidic bond of purine nucleosides, and phosphate is one of the substrates. It is thought that binding of phosphate induces the conformational change as a necessary initial step in the catalysis. This conformational change is manifested in closing of either one of the six active sites in the homohexameric PNPs. It is unclear whether the binding of phosphate is sufficient or just a necessary condition for the closing of the active site. In this paper we conducted an experiment to check this by soaking the crystals of the apo form of the enzyme in increasing concentrations of phosphate.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"171-175"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49079381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Auxin Amidohydrolases – From Structure to Function: Revisited 生长素酰胺水解酶——从结构到功能的再认识
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3356
Ana Smolko, J. Ludwig-Müller, B. Salopek-Sondi
{"title":"Auxin Amidohydrolases – From Structure to Function: Revisited","authors":"Ana Smolko, J. Ludwig-Müller, B. Salopek-Sondi","doi":"10.5562/CCA3356","DOIUrl":"https://doi.org/10.5562/CCA3356","url":null,"abstract":"The control of plant growth and development is a well-coordinated process between exogenous and endogenous signals. Auxins are plant hormones belonging to the endogenous signals, which control a vast array of different processes. While auxins are growth promoting at low concentrations, higher levels are often inhibitory. Therefore, the tight control of auxin concentrations in a given plant tissue is essential. Among several processes that participate in auxin homeostasis, we focused herein on the process of reversible auxin conjugation that considers the synthesis of inactive auxin conjugates, which can be hydrolyzed back to the active form by so called auxin conjugate hydrolases. Although these proteins have been known for quite some time, their role in plants is still not clear, especially since novel hydrolases with different substrate specificities have been isolated. Thus, we have revisited the knowledge about auxin hydrolases, from their structure and biochemistry to the role in plant development and in dealing with unfavorable climate conditions.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"233-239"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43448225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Identification of stable and enantioselective lipases for biotechnological applications 生物技术应用中稳定和对映选择性脂肪酶的鉴定
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3357
K. Jaeger, Alexander Fulton, U. Schwaneberg, J. Pietruszka, F. Kovačić
{"title":"Identification of stable and enantioselective lipases for biotechnological applications","authors":"K. Jaeger, Alexander Fulton, U. Schwaneberg, J. Pietruszka, F. Kovačić","doi":"10.5562/CCA3357","DOIUrl":"https://doi.org/10.5562/CCA3357","url":null,"abstract":"s are used yielding libraries and enantioselective lipases stable under industrially relevant : lipases, screening, biotechnology, stability, enantioselectivity, enzyme assays, high throughput What Should be Considered During Planning Enzyme Screening Projects? CREENING methods for identification of enzymes with desired properties are important in biotechnology. These methods rely on the simultaneous analysis of a large number of samples defined as throughput, which can vary from medium (ca. 10","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"249-253"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44083750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structure and Reactivity Relationships in Methyl and Hydrido Complexes of Platinum(II) by Group 15 Donor Atom Ligands 铂（II）的15族供体原子配体甲基和氢化物配合物的结构与反应关系
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3344
S. Otto, E. Botha, A. Roodt
{"title":"Structure and Reactivity Relationships in Methyl and Hydrido Complexes of Platinum(II) by Group 15 Donor Atom Ligands","authors":"S. Otto, E. Botha, A. Roodt","doi":"10.5562/CCA3344","DOIUrl":"https://doi.org/10.5562/CCA3344","url":null,"abstract":"Square-planar substitution reactions (chlorido for iodide, trans to methyl and hydrido as non-labile ligands) was kinetically investigated in chloroform solution in a series of platinum(II) trans-[PtRCl(L)2] complexes (R = Me: L = PPh3, 1; PPh2Fc, 2; P(NMe2)3, 3; AsPh3, 5; As(4-Me-Ph)3, 6; R = H: L = PPh3, 7) and cis-[PtMeCl(Ph2PFcPPh2)], 4. The reactions follow the normal associative mode of activation, but with equilibria present in all steps, with rate constants for the direct substitution pathway, k12, of (9.1 ± 1.0) × 10−4, 0, (1.389 ± 0.016)×10−2, (1.51 ± 0.15), (2 ± 4) × 10−3, (2.79 ± 0.04) × 10−2 and 0 mol−1 dm3 s−1 at 298 K for 1 to 7 respectively. The corresponding second order rate constants for the solvent assisted pathway, k13', were also determined. The activation parameters for the direct and solvent assisted pathways for 3 were determined as ∆H≠ = 60.4 ± 1.4 and 53.7 ± 0.3 kJ mol−1, and ∆S≠ = −78 ± 4 and −142 ± 1 J mol−1 K−1. A significant more than four orders-of-magnitude reactivity range was observed. Crystal structures of trans-[PtMeCl(PPh2Fc)2].2CHCl3.2H2O, trans-[PtMeCl{P(NMe2)3}2], cis-[PtMeCl(Ph2PFcPPh2)].2CHCl3 and trans-[PtHCl(PPh3)2].CH3OH are reported.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"265-279"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49504881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Alkali salts of nitranilic and cyanochloranilic acids 硝基和氰基氯苯胺酸的碱金属盐
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3333
V. Milašinović, K. Molčanov
{"title":"Alkali salts of nitranilic and cyanochloranilic acids","authors":"V. Milašinović, K. Molčanov","doi":"10.5562/CCA3333","DOIUrl":"https://doi.org/10.5562/CCA3333","url":null,"abstract":"Series of novel alkali salts of nitranilic acid (3, 6-dinitro-2, 5-dihydroxyquinone) and cyanochloranilic acid (3-cyano-6-chloro-2, 5-dihydroxyquinone), and also of neutral cyanochloranilic acid dihydrate, were prepared and their structures were studied. The nitranilate dianion revealed a considerable conformational flexibility of nitro groups. Steric and inductive effects exerted by different substituents (nitro, cyano and chloro) and their influence on molecular geometry and crystal packing are discussed.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"177-186"},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47778147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Distribution of trace elements in waters of the Zrmanja River estuary (eastern Adriatic coast, Croatia) Zrmanja河河口（克罗地亚亚得里亚海东部海岸）水域中微量元素的分布
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-05-09 DOI: 10.5562/CCA3202
Ž. Fiket, M. Ivanić, M. Turk, N. Mikac, G. Kniewald
{"title":"Distribution of trace elements in waters of the Zrmanja River estuary (eastern Adriatic coast, Croatia)","authors":"Ž. Fiket, M. Ivanić, M. Turk, N. Mikac, G. Kniewald","doi":"10.5562/CCA3202","DOIUrl":"https://doi.org/10.5562/CCA3202","url":null,"abstract":"This study aims to investigate the geochemical characteristics of waters of the highly stratified Zrmanja River estuary (eastern Adriatic coast, Croatia). For that purpose, data on salinity and distribution of 16 elements in surface and bottom water of the Zrmanja River estuary was used to assess the spatial variation of trace elements in the estuary water and to identify the main processes governing these variations. The composition of the investigated water was found to be determined primarily by natural factors. Mass concentration levels of dissolved elements were relatively low and typical for unpolluted waters and are considered to primarily reflect the geological and hydrogeological background of the catchment area. The distribution of element mass concentrations along the water column was found to primarily reflect different water masses, the river on the surface and sea at the bottom. Deviation from conservative behaviour for some elements in the bottom water is due to adsorption and desorption processes from the particulate phases.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"29-41"},"PeriodicalIF":0.3,"publicationDate":"2018-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43099298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Bibliometric Analysis of Atmospheric Simulation Trends in Meteorology and Atmospheric Science Journals 气象和大气科学期刊大气模拟趋势的文献计量分析
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3210
Jinfeng Li, Yuanhang Zhang, Xuesong Wang, Y. Ho
{"title":"Bibliometric Analysis of Atmospheric Simulation Trends in Meteorology and Atmospheric Science Journals","authors":"Jinfeng Li, Yuanhang Zhang, Xuesong Wang, Y. Ho","doi":"10.5562/CCA3210","DOIUrl":"https://doi.org/10.5562/CCA3210","url":null,"abstract":"This study was designed to evaluate the global scientific output of simulation research in \"meteorology and atmospheric sciences\" for the past 16 years and to assess the characteristics of the atmospheric simulation research patterns, tendencies and methods in the papers, from leading countries and institutes. Data were based on the online version of Science Citation Index, Web of Science from 1992 to 2007. Articles referring to atmospheric simulation were assessed by exponential regression fitting the trend of publication outputs with r 2 = 0.9996, distribution of source countries, source institutes, source titles, author keywords, and keywords plus, and the four most cited articles in these years. By synthetic analysis of the three kinds of keywords, it was concluded that atmospheric simulation research related to \"ozone\", \"climate\", \"circulation\", \"transport\", \"parameterization\" and \"assimilation\" will be foci of atmospheric simulation research in the 21 st century.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"695-705"},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42950738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 42
Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro 黑山白铝土矿中天然Allophane/Gibbsite的微观结构特征
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3276
M. Ristić, S. Krehula, S. Musić
{"title":"Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro","authors":"M. Ristić, S. Krehula, S. Musić","doi":"10.5562/CCA3276","DOIUrl":"https://doi.org/10.5562/CCA3276","url":null,"abstract":"Microstructural properties of white bauxite from Montenegro were investigated. XRD analysis showed the presence of allophane (Al2O3 · 2SiO2 · 3H2O) and gibbsite (γ-Al(OH)3). The allophane phase showed very broadened diffraction lines, thus indicating poor crystallinity as well as very fine nanoparticles in this phase. Upon heating of natural allophane/gibbsite at 1000 °C mullite (Al6Si2O13) was formed, but with a lower degree of crystallinity. FT-IR spectra of allophane, gibbsite and mullite were interpreted. FE-SEM images of natural allophane/gibbsite showed a dominantly amorphous-like morphology. Upon heating of natural allophane/gibbsite two-dimensional (2D) microstructure was visible. EDS analysis showed traces of calcium, potassium, magnesium and iron. The 57Fe Mössbauer spectrum of iron traces showed a small relative intensity magnetic splitting component due to the presence of hematite and a central quadrupole doublet due to the presence of Fe3+ ions substituted for Al3+ in octahedral positions and/or a superparamagnetic fraction of hematite particles. The possible geochemical mechanism of white bauxite formation in Montenegro is discussed.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"65-70"},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48155946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Unsanitary Landfill Fires as a Source of a PCDD/Fs Contamination 不卫生的堆填区火灾是多氯联苯/氟污染的来源
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3145
H. Fajković, M. Ivanić, Lovorka Pitarević, I. Nemet, Sanda Rončević, E. Prohić
{"title":"Unsanitary Landfill Fires as a Source of a PCDD/Fs Contamination","authors":"H. Fajković, M. Ivanić, Lovorka Pitarević, I. Nemet, Sanda Rončević, E. Prohić","doi":"10.5562/CCA3145","DOIUrl":"https://doi.org/10.5562/CCA3145","url":null,"abstract":"The aim of this study was to determine whether a combustion process (open burning) on an unsanitary landfill produces polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), for which several media were analysed (smoked air, landfill soil, and lake sediment). The concentration of PCDD/Fs detected in the air increased over 4000 times during the landfill fire, from 0.480 fg m–3 to 1940.4 fg m–3 or expressed as Toxic Equivalency (TEQ) from 0.004 fg TEQ m–3 to 25.72 fg TEQ m–3. Increased values of PCDD/Fs were also determined in the soil from the landfill site (2597.6 ng kg-1, 48.11 ng TEQ kg-1), and the influence of combustion process occurring on the landfill was also registered in the nearby lake sediment (23.17 ng kg–1, 0.03 ng TEQ kg–1). Due to the high sedimentation rate (6.4 mm y–1), a significant contaminant dilution in the lake sediment can be expected. The results of this preliminary study point to the need of implementing a continuous long-term monitoring of PCDD/PCDFs in the landfill surrounding environment.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":"91 1","pages":"71-79"},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46563498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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