bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mobile app interaction in pandemic times: experience of pregnant and postpartum woman / Interação por aplicativo móvel em tempos de pandemia: experiência de gestantes e puérperas
Authors: De Lima Margarete Maria , De Almeida Rocha Gabriela , Costa Roberta , Antunes Wilhelm Laís , Pereira Drews Miriane , Frello Roque Ariane Thaise 
Published: January 2024

Objetivo: conhecer a experiência de mulheres que compartilharam a vivência do ciclo gravídico-puerperal durante a Pandemia Covid-19 em um grupo de aplicativo de mensagem criado para complementar as atividades educativas de um grupo de gestantes. Método: estudo qualitativo, descritivo e exploratório. Os dados são provenientes das mensagens de 94 mulheres participantes de Grupos de Gestantes e Casais Grávidos realizados em 2020, vinculado a um projeto de extensão de uma Universidade do Sul do país. Resultados: apresentam sentimentos relacionados à ausência do contato físico com família e amigos, dúvidas e desafios encontrados durante a gestação e puerpério, medos e incertezas em relação ao processo de parto e nascimento. Conclusão: o grupo de gestantes mediado por aplicativo de mensagens mostrou ser um aliado na interação entre as mulheres, possibilitando a educação em saúde e a criação de uma rede de apoio respeitando o distanciamento social.
Crystallographic report: Crystal structure of a three‐dimensional coordination polymer, [Cd(Hbtc)(H2O)]n (btc = 1, 2, 4−benzenetricarboxylate)
Authors: Zheng Pei‐Qing , Long La‐Sheng , Huang Rong‐Bin , Zheng Lan‐Sun 
Published: July 2003

AbstractThe three‐dimensional coordination polymer [Cd(Hbtc)(H2O)]n (1) (btc = 1, 2, 4−benzenetricarboxylate) has been synthesized by hydrothermal reaction of cadmium(II) ions and 1,2,4‐benzenetricarboxylic acid anhydride in which the cadmium(II) center is coordinated by one water molecule and five separated Hbtc ligands that define a distorted octahedral geometry. Copyright © 2003 John Wiley & Sons, Ltd.
Synthesis, properties and crystal structural characterization of diorganotin(IV) derivatives of 2‐mercapto‐6‐nitrobenzothiazole
Authors: Ma Chunlin , Jiang Qin , Zhang Rufen 
Published: July 2003

AbstractThe diorganotin(IV) dichlorides R2SnCl2 (R: Ph, PhCH2 or n‐Bu) react with 2‐mercapto‐6‐nitrobenzothiazole (MNBT) in benzene to give [Ph2SnCl(MNBT)] (1), [(PhCH2)2Sn(MNBT)2] (2) and [(n‐Bu)2Sn(MNBT)2] (3). The three complexes have been characterized by elemental analysis and IR, 1H, 13C and 119Sn NMR spectroscopies. X‐ray studies of the crystal structures of 1, 2 and 3 show the following. The tin environment for complex 1 is distorted cis‐trigonal bipyramid with chlorine and nitrogen atoms in apical positions. The structure of complex 2 is a distorted octahedron with two benzyl groups in the axial sites. The geometry at the tin atom of complex 3 is that of an irregular octahedron. Interestingly, intra‐molecular non‐bonded Cl…S interactions and S…S interaction were recognized in the crystallographic structures of 1 and 3 respectively. As a result, complex 1 is a polymer and complex 3 is a dimer. Copyright © 2003 John Wiley & Sons, Ltd.
Studies on the disproportionation of trichloromethyltin
Authors: Bertelo Christopher A. , Duriez Christophe , Girois Stéphane , Jousseaume Bernard , Toupance Thierry 
Published: July 2003

AbstractThe rate of disproportionation of trichloromethyltin in various solvents was studied by two methods, derivatization with sodium tetraethylborate and 13C NMR measurements, which gave similar results. The reaction followed second‐order kinetics and was more rapid in coordinating solvents than in uncoordinating ones. Moreover, it was catalyzed by nucleophiles, such as amines or alcohols, which is in favor of a nucleophile‐assisted electrophilic reaction. Copyright © 2003 John Wiley & Sons, Ltd.
Preparation and properties of organic–inorganic hybrid gel films based on polyvinylpolysilsesquioxane synthesized from trimethoxy(vinyl)silane
Authors: Gunji Takahiro , Okonogi Hiroshi , Sakan Tomomi , Takamura Norihiro , Arimitsu Koji , Abe Yoshimoto 
Published: July 2003

AbstractPolyvinylpolysilsesquioxane (PVPS) organic–inorganic hybrid gel films comprising polyethylene and siloxane backbone linkages were prepared through two routes: trimethoxy(vinyl)silane (VTS) was first subjected to radical polymerization of the vinyl groups, followed by acid‐catalyzed hydrolytic polycondensation of the trimethoxysilyl groups (route A) to afford PVPS; in the second route PVPS was prepared in reverse order (route B). PVPS gel films were transparent and homogeneous. We find that the mechanical and heat‐resisting properties correlate both to the degree of polymerization and the degree of cross‐linking. Copyright © 2003 John Wiley & Sons, Ltd.
Arylferrocenylmethanols: a new family of ferrocenes to be used as mediators in biosensors
Authors: Carollo Lorenzo , Curulli Antonella , Floris Barbara 
Published: July 2003

AbstractArylferrocenylphenylmethanols, ArFcPhCOH, were prepared from the corresponding aryl ferrocenyl ketones, ArCOFc, prepared by Friedel–Crafts acylation. pKa values of ArCOFc were determined in sulfuric acid. The electrochemical properties of ArFcPhCOH were investigated. Copyright © 2003 John Wiley & Sons, Ltd.
Synthesis and radioprotective study of new siladithioacetals and germadithioacetals
Authors: Célariès Benoît , Amourette Christine , Lion Claude , Rima Ghassoub 
Published: July 2003

AbstractA series of organosilicon and organogermanium compounds derived from cysteamine, methylcysteamine and 2‐[1‐(1‐naphthyl)ethyl]‐2‐imidazoline have been prepared and their radiopharmacological properties (radioprotective activity and toxicity) have been determined in mice. A number of these new organometallic derivatives have been found to possess radioprotective activity.We have also noted a notable decrease of the toxicity and a fairly large increase in the radioprotective activity in comparison with the unsubstituted organic molecules. Copyright © 2003 John Wiley & Sons, Ltd.
UV light‐mediated alkylation of inorganic selenium
Authors: Guo Xuming , Sturgeon Ralph E. , Mester Zoltán , Gardner Graeme J. 
Published: July 2003

AbstractIn the presence of low molecular weight organic acids (formic, acetic, propionic and malonic), inorganic selenium(IV) is converted by UV irradiation to volatile selenium carbonyl, dimethylselenide and diethylselenide, depending on the acid used. Gas chromatography–mass spectrometry analysis of the volatile products shows that, in 0.7 M formic acid solution, approximately 60–70% (v/v) SeH2 and 30–40% (v/v) SeCO are formed. The presence of nitrate ion appears to increase threefold the formation of SeCO while completely suppressing formation of SeH2. Copyright © 2003 Crown in the right of Canada. Published by John Wiley & Sons, Ltd.
Synthesis and characterization of novel chelated dimethylamino lithium arylamide dimers: molecular structure of [1‐LiNPhCHPhCH2‐2‐NMe2C6H4]2
Authors: Al‐Masri Harbi Tomah , Sieler Joachim , Hey‐Hawkins Evamarie 
Published: July 2003

AbstractThe reaction of 1‐NHPhCHPh‐2‐NMe2C6H4 (1) and 1‐NHPhCHPhCH2‐2‐NMe2C6H4 (2) with n‐BuLi in diethyl ether gave the solvent‐free chelated dimethylamino lithium amides [1‐LiNPhCHPh‐2‐NMe2C6H4]2 (3) and [1‐LiNPhCHPhCH2‐2‐NMe2C6H4]2 (4). The lithium amides 3 and 4 were characterized by 1H, 7Li, and 13C NMR spectroscopy. A crystal structure determination was carried out on 4, which is the first example of a structurally characterized solvent‐free dimeric chelated dimethylamino lithium arylamide with three‐coordinate lithium centers that contains a seven‐membered chelate ring. Copyright © 2003 John Wiley & Sons, Ltd.
Effects of tributyltin(IV) chloride on fertilization of Styela plicata (Ascidiacea: Tunicata): II. Scanning and transmission electron microscopy studies
Authors: Mansueto C. , Villa L. , D'Agati P. , Marcianò V. , Pellerito C. , Fiore T. , Scopelliti M. , Nagy L. , Pellerito L. 
Published: July 2003

AbstractThe morphological aspects of Styela plicata fertilization after treatment with tributyltin(IV) chloride are described by means of scanning and transmission electron microscopy investigations. Alterations have been shown both on female and male gametes; spermatozoa, all the egg envelopes and the mitochondria of the egg cortical cytoplasm are modified in relation to incubation time. As a consequence, the damage to gametes blocks sperm–egg interaction and fertilization does not occur. Copyright © 2003 John Wiley & Sons, Ltd.
Simultaneous arsenic‐ and selenium‐specific detection of the dimethyldiselenoarsinate anion by high‐performance liquid chromatography–inductively coupled plasma atomic emission spectrometry
Authors: Gailer J. , Buttigieg G. A. , Denton M. B. 
Published: July 2003

AbstractThe seleno‐bis (S‐glutathionyl) arsinium ion, [(GS)2AsSe]−, which can be synthesized from arsenite, selenite and glutathione (GSH) at physiological pH, fundamentally links the mammalian metabolism of arsenite with that of selenite and is potentially involved in the chronic toxicity/carcinogenicity of inorganic arsenic. A mammalian metabolite of inorganic arsenic, dimethylarsinic acid, reacts with selenite and GSH in a similar manner to form the dimethyldiselenoarsinate anion, [(CH3)2As(Se)2]−. Since dimethylarsinic acid is an environmentally abundant arsenic compound that could interfere with the mammalian metabolism of the essential trace element selenium via the in vivo formation of [(CH3)2As(Se)2]−, a chromatographic method was developed to rapidly identify this compound in aqueous samples. Using an inductively coupled plasma atomic emission spectrometer (ICP‐AES) as the simultaneous arsenic‐ and selenium‐specific detector, the chromatographic retention behaviour of [(CH3)2As(Se)2]− was investigated on styrene–divinylbenzene‐based high‐performance liquid chromatography (HPLC) columns. With a Hamilton PRP‐1 column as the stationary phase (250 × 4.1 mm ID, equipped with a guard column) and a phosphate‐buffered saline buffer (0.01 mol dm−3, pH 7.4) as the mobile phase, [(CH3)2As(Se)2]− was identified in the column effluent according to its arsenic:selenium molar ratio of 1 : 2. With this stationary phase/mobile phase combination, [(CH3)2As(Se)2]− was baseline‐separated from arsenite, selenite, dimethylarsinate, methylarsonate and low molecular weight thiols (GSH, oxidized GSH) that are frequently encountered in biological samples. Thus, the HPLC–ICP‐AES method developed should be useful for rapid identification and quantification of [(CH3)2As(Se)2]− in biological fluids. Copyright © 2003 John Wiley & Sons, Ltd.
Synthesis and characterization of di‐n‐butyltin(IV) complexes with 4′/2′‐nitrobiphenyl‐2‐carboxylic acids: X‐ray crystal structures of [{(n‐C4H9)2Sn(OCOC12H8NO2−4′)}2O]2 and (n‐C4H9)2Sn{OCOC12H8NO2−4′}2
Authors: Kapoor Ramesh , Gupta Anand , Kapoor Pratibha , Venugopalan Paloth 
Published: July 2003

AbstractReactions of di‐n‐butyltin(IV) oxide with 4′/2′‐nitrobiphenyl‐2‐carboxylic acids in 1 : 1 and 1 : 2 stoichiometry yield complexes [{(n‐C4H9)2Sn(OCOC12H8NO2−4′/2′)}2O]2 (1 and 2) and (n‐C4H9)2Sn(OCOC12H8NO2−4′/2′)2 (3 and 4) respectively. These compounds were characterized by elemental analysis, IR and NMR (1H, 13C and 119Sn) spectroscopy. The IR spectra of these compounds indicate the presence of anisobidentate carboxylate groups and non‐linear CSnC bonds. From the chemical shifts δ (119Sn) and the coupling constants 1J(13C, 119Sn), the coordination number of the tin atom and the geometry of its coordination sphere have been suggested. [{(n‐C4H9)2Sn(OCOC12H8NO2−4′)}2O]2 (1) exhibits a dimeric structure containing distannoxane units with two types of tin atom with essentially identical geometry. To a first approximation, the tin atoms appear to be pentacoordinated with distorted trigonal bipyramidal geometry. However, each type of tin atom is further subjected to a sixth weaker interaction and may be described as having a capped trigonal bipyramidal structure. The diffraction study of the complex (n‐C4H9)2Sn(OCOC12H8NO2−4′)2 (3) shows a six–coordinate tin in a distorted octahedral frame containing bidentate asymmetric chelating carboxylate groups, with the n‐Bu groups trans to each other. The n‐BuSnn‐Bu angle is 152.8° and the SnO distances are 2.108(4) and 2.493(5) Å. The oxygen atom of the nitro group of the ligand does not participate in bonding to the tin atom in 1 and 3. Crystals of 1 are triclinic with space group P1 and of that of 3 have orthorhombic space group Pnna. Copyright © 2003 John Wiley & Sons, Ltd.
The synthesis, NMR (1H, 13C, 119Sn) and IR spectral studies of some di‐ and tri‐organotin(IV) sulfonates: X‐ray crystal structure of [(n‐C4H9)2Sn(OSO2C6H4CH3‐4)2·2H2O]
Authors: Kapoor Ramesh , Gupta Anand , Kapoor Pratibha , Venugopalan Paloth 
Published: July 2003

AbstractA number of alkyltin(IV) paratoluenesulfonates, RnSn(OSO2C6H4CH3‐4)4−n (n = 2, 3; R = C2H5, n‐C3H7, n‐C4H9), have been prepared and IR spectra and solution NMR (1H, 13C, 119Sn) are reported for these compounds, including (n‐C4H9)2Sn(OSO2X)2 (X = CH3 and CF3), the NMR spectra of which have not been reported previously. From the chemical shift δ(119Sn) and the coupling constants 1J(13C, 119Sn) and 2J(1H, 119Sn), the coordination of the tin atom and the geometry of its coordination sphere in solutions of these compounds is suggested. IR spectra of the compounds are very similar to that observed for the paratoluenesulfonate anion in its sodium salt. The studies indicate that diorganotin(IV) paratoluenesulfonates, and the previously reported compounds (n‐C4H9)2Sn(OSO2X)2 (X = CH3 and CF3), contain bridging SO3X groups that yield polymeric structures with hexacoordination around tin and contain non‐linear CSnC bonds. In triorganotin(IV) sulfonates, pentacoordination for tin with a planar SnC3 skeleton and bidentate bridging paratoluenesulfonate anionic groups are suggested by IR and NMR spectral studies. The X‐ray structure shows [(n‐C4H9)2Sn(OSO2C6H4CH3‐4)2·2H2O] to be monomeric containing six‐coordinate tin and crystallizes from methanol–chloroform in monoclinic space group C2/c. The SnO (paratoluenesulfonate) bond distance (2.26(2) Å) is indicative of a relatively high degree of ionic character in the metal–anion bonds. Copyright © 2003 John Wiley & Sons, Ltd.
Toxicological and pesticidal studies on novel bioactive sulfonamide imine organotin(IV) complexes
Authors: Jain Mukta , Singh R. V. 
Published: July 2003

AbstractToxicological, pesticidal and stereochemical aspects of organotin(IV) complexes with a sulfonamide imine ligand having an N∩N donor system are described with the support of elemental analysis, IR, UV, 1H NMR, 13C NMR and 119Sn NMR spectroscopy. The spectral data suggest that the ligand acts in a monobasic bidentate manner coordinating through the nitrogen atom. The complexes have been characterized on the basis of molecular weight determinations, conductivity measurements, and magnetic measurements. The isolated products are coloured solids, soluble in dimethylsulfoxide, dimethylformamide (DMF) and methanol. All the complexes are monomeric in nature, as indicated by their molecular weight determinations. Conductivity measurements in dry DMF show them to be non‐electrolytes. From the analyses of these studies the donor sites of the ligand are located and the geometries of the donor environment around the tin(IV) acceptor centres proposed. The ligand and its metal complexes are tested in vitro against a number of pathogenic fungal and bacterial strains and the findings are discussed. Emphasis has been given to the nematicidal properties. Copyright © 2003 John Wiley & Sons, Ltd.
Prospective evaluation of laparoscopic total mesorectal excision with colonic J-pouch reconstruction for mid and low rectal cancers
Authors: Tsang W W C , Chung C C , Li M K W 
Published: July 2003

Abstract

Background
Results of laparoscopic sphincter-preserving total mesorectal excision and colonic J-pouch reconstruction are few. The aim of this study was to examine outcomes after this procedure.

Methods
Patients with mid or low rectal cancer underwent laparoscopic total mesorectal excision with construction of a colonic J pouch, performed by a single surgeon. The patients were evaluated prospectively.

Results
From March 1999 to January 2002, 44 patients underwent laparoscopic total mesorectal excision with colonic J-pouch reconstruction. There were 21 men and 23 women of median age 65·5 years. The median operating time was 180 min and median blood loss 80 ml. There was no conversion to an open procedure. The median distance of the anastomosis from the anal verge was 4 cm. No procedure-related death occurred. Four patients developed significant complications that required reoperation. With a median follow-up period of 15 months, no port-site recurrence was noted. Five patients developed distant metastases, and two had local recurrence in the pelvis. Bowel function was satisfactory at 6, 12 and 18 months after ileostomy closure.

Conclusion
Laparoscopic total mesorectal excision with colonic J-pouch reconstruction is safe, with a reasonable operating time. Early results suggest satisfactory oncological control and functional outcomes.
Prospective study of proximal gastrectomy for early gastric cancer in the upper third of the stomach
Authors: Katai H , Sano T , Fukagawa T , Shinohara H , Sasako M 
Published: July 2003

Abstract

Background
Total gastrectomy with D2 dissection is the standard treatment in Japan for early upper-third gastric cancer. The purpose of this study was to confirm the safety and radicality of proximal gastrectomy as an alternative operation.

Methods
Between 1993 and 1999, 45 patients with an apparent primary early gastric cancer in the upper third of the stomach were treated by proximal gastrectomy with jejunal interposition. The spleen was preserved, but the suprapancreatic nodes were cleared.

Results
Histology confirmed early gastric cancer in 37 patients while eight had advanced disease. Nodal metastasis was observed in six patients. There was no hospital death and no early postoperative complications. One patient died from nodal recurrence and two from unrelated causes. Two patients had reflux symptoms without endoscopic oesophagitis. Mean weight loss was 11·5 per cent of initial bodyweight.

Conclusion
Proximal gastrectomy for early upper-third gastric cancer can be performed safely with an excellent cure rate. This procedure deserves further clinical evaluation to assess patients' quality of life.
Non-Hodgkin lymphoma presenting with obstructive jaundice
Authors: Ravindra K V , Stringer M D , Prasad K R , Kinsey S E , Lodge J P A 
Published: July 2003

Abstract

Background
Obstructive jaundice is a rare presenting feature of non-Hodgkin lymphoma (NHL). Lymphomatous masses in the peripancreatic and hepatic hilar regions are potentially difficult to diagnose.

Methods
A retrospective analysis was undertaken of patients presenting with obstructive jaundice secondary to NHL at a tertiary care hepatobiliary unit.

Results
Over a 7-year period, six adults and three children with NHL were managed. The site of the lymphomatous mass was at the hepatic hilum in six patients and the peripancreatic area in three. Diagnostic procedures included a laparotomy and biopsy in four patients, hepatic trisectionectomy in two, percutaneous biopsy in two and lymph node biopsy in one patient. Percutaneous biopsy confirmed the diagnosis in both the patients in whom it was attempted. One patient died following liver resection. Chemotherapy was the mainstay of treatment and achieved complete remission in four patients, partial remission in three and no response in one patient. Two patients subsequently required operation for a benign biliary stricture after achieving complete remission.

Conclusion
NHL must be considered in the differential diagnosis of obstructive jaundice in adults and children. Attempts must be made to diagnose the condition using non-operative techniques. Chemotherapy is the mainstay of treatment. Late benign strictures of the bile duct requiring operation may develop.
l-Erythro-methoxamine is more potent than phenylephrine in effecting contraction of internal anal sphincter in vitro
Authors: Jones O M , Thompson J M , Brading A F , Mortensen N J McC 
Published: July 2003

Abstract

Background
Topical phenylephrine has been shown to increase resting anal canal pressure in normal and incontinent individuals. However, high concentrations of gel (10–40 per cent) are required that may cause local side-effects. The aim of this study was to determine whether methoxamine, another α-1-adrenoceptor agonist, might be a more potent alternative to phenylephrine.

Methods
Porcine internal anal sphincter (IAS) tissue was cut into strips, suspended in a superfusion organ bath and allowed to equilibrate. Strips were subjected to each drug under test for 20 s, sufficient to obtain stable tone. Phenylephrine, methoxamine (1 : 1 : 1 : 1 ratio of its four isomers) and each of the individual isomers of methoxamine were evaluated in turn.

Results
In vitro, methoxamine racemate and phenylephrine were similarly potent in causing contraction of IAS strips (mean(s.e.m.) dose giving half maximal effect (EC50) at 74·7(16·5) versus 58·3(13·4) µM respectively; P = 0·443). However, one of the methoxamine isomers, l-erythro-methoxamine (EC50 17·6(3·7) µM), was significantly more potent than the other three isomers, methoxamine racemate and phenylephrine (P = 0·002).

Conclusion
l-Erythro-methoxamine is four times more potent than phenylephrine and is a possible treatment for incontinence. Trials are under way to examine the efficacy of l-erythro-methoxamine in vivo.
Reoperation for neurological complications following carotid endarterectomy
Authors: Stewart A H R , McGrath C M , Cole S E A , Smith F C T , Baird R N , Lamont P M 
Published: July 2003

Abstract

Background
There remains a dilemma whether or not to re-explore the carotid artery when a neurological complication occurs after carotid endarterectomy. This study reviewed the indications for, findings and clinical outcomes following re-exploration.

Methods
Patients who experienced transient or permanent neurological events following carotid endarterectomy were identified from a prospectively compiled computerized database. Case notes were retrieved to determine time to onset of symptoms, use of carotid artery imaging and details about patients who had surgical re-exploration, and outcomes.

Results
Some 780 consecutive carotid endarterectomies were performed over 16 years, with an incidence of major stroke or death of 2·3 per cent (18 patients). Fifty-one patients experienced transient or permanent neurological events following surgery, 25 of whom underwent re-exploration. The findings included carotid thrombosis (ten patients), flap or other technical cause (three), haematoma (two) and no abnormality (ten). The neurological outcome after 30 days was similar, whether or not the carotid artery was re-explored.

Conclusion
Carotid artery re-exploration was undertaken in approximately half of the patients who developed neurological complications following carotid endarterectomy. Although the cause was identified and a secondary procedure was undertaken in 14 of 25 patients, there was no improvement in clinical outcome at 30 days compared with that of patients managed non-operatively.