Hydrothermal Synthesis and X-ray Characterization of Silver(I) Complex:Diacetylthiocarbamide Silver(I) Nitrate, [Ag(CH_3CONHC(S)NH_2)_2](NO_3)

The title compound [Ag(CH3CONHC(S)NH2)2](NO3) has been prepared by hydrothermal synthesis and characterized by single-crystal X-ray diffraction. It crystallizes in mo-noclinic, space group P21/c with Mr = 406.20 (C6H12Ag N5O5S2), a = 12.0680(6), b = 6.8056(5), c = 18.0173(1) ? b = 111.383(4), V = 1377.9(2) 3, Z = 4, Dc = 1.958 g/cm3 , F(000) = 808, = 1.789 mm-1, R = 0.0361 and wR = 0.1015. Of 4185 reflections ((2)max = 55.00?, 3147 were unique (Rint = 0.0174) and 2820 with I > 2(I) were used to solve the structure. The silver(I) atom adopts V-shape geometry with the AgS bond distance of 2.4271(7) and 2.7229(9) , respectively. Seven atoms of one acetylthiocarbamide ligand are coplanar, while only four atoms of another acetylthio-carbamide ligand are fairly planar. The [Ag(CH3CONHC(S)NH2)2]+ cation and nitrate anion NO3- are connected by hydrogen bonds to form a three dimensional hydrogen bonding network..

Solubility of the silver nitrate in supercritical carbon dioxide with ethanol and ethylene glycol as double cosolvents: Experimental determination and correlation

Solubility of the silver nitrate in the supercritical carbon dioxide containing ethanol and ethylene glycol as double cosolvents was measured under certain pressure and temperature range(10–25 MPa, 323.15–333.15 K). The impact of the pressure and temperature on the solubility was also investigated. Based on the experiment data,a correlation model concerning solid's solubility in supercritical fluids was established by combining the solubility parameter with the thermodynamic equation when a binary interaction parameter and a mixed solvent solubility parameter were defined. Experiments show the solubility of AgNO_3 increases with the pressure at a certain temperature. However, the influence of temperature is related to a pressure defined as the turnover pressure(12.3 MPa). When the pressure is higher(or lower) than this turnover pressure, silver nitrate's solubility shows increasing(or decreasing) trend as the temperature rises. Satisfactory accuracy of our presented model was revealed by comparing experimental data with calculated results.

THE COORDINATION BETWEEN SILVER NITRATE AND OPEN CHAIN POLYETHER

A complex of silver nitrate with 1.8-bis（8’-quinolyloxy）-3.6-dioxaoctane （noted as ligand L） was synthesized. The results of element analysis show that it consists of the calculated values of [Ag4L3]（NO3）4. It is clear from the IR, UV and ’HNMR spectra that the ligand L coordinated to Ag+ ion with its N and 0 atoms which connected with the terminal quinolyloxy group.

Silver nitrate mimicking a foreign body in the pharyngeal mucosal space

Silver nitrate is sometimes used as a means of chemicalcauterization for control of minor bleeding and management of hypergranulation tissue following bedside head and neck procedures. There are only few reports available on the imaging appearance of silver nitrate and its potential to mimic a foreign body. We report a case of a patient presenting with dysphagia, odynophagia, and fever following dental work who had a peritonsillar incision and drainage for treatment of a deep neck space infection. During the procedure, silver nitrate was applied to halt the bleeding. Patient was subsequently transferred to another institution. Since the patient was not showing significant clinical improvement on antibiotic therapy, a computed tomography(CT) scan was performed demonstrating a hyperdense structure lodged in the pharyngeal mucosal space in the oropharynx and soft palate that was mistaken for a foreign body such as bone. Silver nitrate can have density similar to bone but does not have the normal architecture of bone with cortex and marrow on CT. Familiarity with the appearance of silver nitrate on CT, lack of bone architecture, and proper documentation and communication of the use of silver nitrate to the consultant radiologist and medical personnel could help avoid misdiagnosis and potentially unnecessary surgical exploration.

Role of Silver Nitrate on in Vitro Flowering and Shoot Regeneration of Solanum nigrum (L.)—An Important Multipurpose Medicinal Plant

Silver nitrate induced MS media enhanced multiple shoot regeneration and in vitro flowering from axillary bud and leaf explants of Solanum nigrum (L.) an important antiulcer medicinal plant. Healthy axillary bud and leaf explants were inoculated on MS medium supplemented with BAP/Kn (1.0 - 2.0 mg/l) in combination with IAA/NAA (0.5 mg/l) and AgNO3 (0.1 - 1.0 mg/l). The explants were responded effectively and good regeneration frequencies were observed in all the combinations of silver nitrate tested when compared to control. Maximum number of multiple shoots (34.3) was found in leaf explants cultured on MS media supplemented with BAP (2.0 mg/l), NAA (0.5 mg/l) and AgNO3 (0.4 mg/l). These regenerated shoots were sub-cultured on to the flowering media. Maximum number of in vitro flowers (12) was obtained from axillary bud explants in BAP (2.0 mg/l), Kn (1.0 mg/l), IAA (0.5 mg/l) and AgNO3 (6.0 mg/l) supplemented media when compared to leaf (4) and control. All the in vitro raised shoots were transferred to rooting medium supplemented with NAA, IBA (1.0 - 2.0 mg/l) and AgNO3 (0.1 - 0.6 mg/l). The best rooting response (24.6) was observed in 2.0 mg/l IBA + 0.4 mg/l AgNO3. The well rooted plantlets were transferred to polybags containing soil + vermiculate in 1:1 ratio for hardening and finally the hardened plantlets were transferred to field conditions.

Influence of Ethylene Inhibitor Silver Nitrate on Direct Shoot Regeneration from in Vitro Raised Shoot Tip Explants of Sphaeranthus indicus Linn.—An Important Antijaundice Medicinal Plant

In the present investigation, an attempt has been made to study the influence of ethylene inhibitor silver nitrate on direct shoot regeneration in Sphaeranthus indicus, an important antijaundice medicinal plant, by using in vitro raised shoot tip explants. The effect of various concentrations of kinetin, BAP (0.5 - 3.0 mg/l), and NAA (0.1 - 0.5 mg/l) along with AgNO3 (0.1 - 1.0 mg/l) was studied. Among the combinations tested MS medium augmented with kinetin (1.0 mg/l), NAA (0.1 mg/l) and AgNO3 (0.4 mg/l) was found to be optimum for production of multiple shoots (34.3 ± 0.36). Addition of AgNO3 to the media not only increases shoot number in all the concentrations tested but also shoot length. AgNO3 at the concentration of 0.4 mg/l produced 35% more number of multiple shoots when compared to multiple shoots (10.8 ± 0.12) produced in control. In the present study by the addition of ethylene inhibitor silver nitrate and growth regulators, more number of multiple shoots (three folds) and shoot length was observed compared to control. These in vitro raised shoots were transferred to the rooting medium containing different concentrations of auxins such as NAA and IAA along with AgNO3 (0.1 - 0.6 mg/l). Better rooting response (21.6) was observed on NAA (2.0 mg/l) and AgNO3 (0.4 mg/l) containing media. The healthy rooted plantlets were transferred to polybags containing soil and vermiculate in 1:1 ratio for hardening. Finally the hardened plants were transferred to field environment for utmost survivability.

OXIDATIVE DEGRADATION OF BILIVERDIN AND BILIRUBIN ESTERS IN PRESENCE OF SILVER NITRATE

Treatment of biliverdin IXα dimethyl ester(2)with silver nitrate in alkaline solution gave two violin-like tripyrrione carbaldehydes,one de- graded at C15-C16,other at C4-C5.Biliverdin IXα(1),bilirubin IXα(3)and its dimethyl ester(4)gave the same results.

Application of silver nitrate colorimetric method to non-steady-state diffusion test

NT build 443,or profile fitting method,is often used to measure the diffusion coefficient of chloride in concrete.However,this method is quite laborious and needs special equipment.Colorimetric method is a quick and simple method to measure the penetration depth of chloride by spraying 0.1 mol/L silver nitrate solution.The objective of this work is to study the possibility of the use of colorimetric method in the calculation of non-steady-state diffusion coefficient.Twelve concrete mixtures with different supplementary cementitious materials and water-to-cement ratios of 0.35,0.48 and 0.6 were used for study.According to NT build 443,the concrete specimens were immersed in 165 g/L NaCl(2.8 mol/L) solution for 42 d.Both water-soluble(convert to free chloride) chloride and acid-soluble chloride at different layers of specimens were measured.The results show that the mean value of free chloride concentration at the color change boundary cd was 0.306 mol/L.The surface free chloride concentration cs was obtained by profile fitting method,which was 40% lower than the chloride concentration of exposure solution after an immersion period of 42 d.Chloride diffusion coefficients obtained by the colorimetric method was not well correlated with those obtained by profile fitting method.

银染高尔基染色法用于神经元完整结构成像

高尔基染色是神经元树突和树突棘可视化的经典方法,目前仍被广泛用于神经元形态可视化。银高尔基染色目前存在易产生黑色沉淀、染色神经元形态结构不完整等问题。对重铬酸钾(K_(2)Cr_(2)O_(7))和硝酸银(AgNO_(3))如何影响银染高尔基染色方法的染色效果进行了研究,通过研究染色液组成成分重铬酸钾、硝酸银质量浓度变化和组分的不同作用方式,实现了对银染高尔基染色方法的优化。结果表明,35 mg/mL多聚甲醛(Paraformaldehyde,PFA)和20 mg/mL K_(2)Cr_(2)O_(7)混合液染色效果要明显优于20 mg/mL K_(2)Cr_(2)O_(7)单独染色效果,在K_(2)Cr_(2)O_(7)的质量浓度优化过程中,80 mg/mL K_(2)Cr_(2)O_(7)的染色效果最佳,35 mg/mL PFA与20 mg/mL K_(2)Cr_(2)O_(7)混合溶液和80 mg/mL K_(2)Cr_(2)O_(7)最佳染色时长比为3∶1,染色过程中AgNO_(3)的最佳质量浓度为10 mg/mL,在最终的染色液组成成分以及作用方式中40 mg/mL PFA固定2 d、35 mg/mL PFA和20 mg/mL K_(2)Cr_(2)O_(7)混合溶液处理3 d、80 mg/mL K_(2)Cr_(2)O_(7)处理1 d和10 mg/mL AgNO_(3)处理5 d对脑组织神经元形态的可视化具有最佳效果。优化后的银染高尔基染色方法可实现对神经元的完整形态结构染色,同时在染色过程也将产生更少的成像杂质沉淀噪点。该工作将提供一种新的高尔基改良染色方法,实现神经元完整形态结构的染色,有望为研究脑神经元结构变化与脑疾病之间的关系提供新的染色方法。

硝酸银硅胶色谱法制备蒙药土木香中土木香内酯和异土木香内酯

目的探讨蒙药土木香中土木香内酯及异土木香内酯的制备方法。方法采用硝酸银硅胶色谱法进行制备。结果得到两个色泽优良、克数较大的结晶化合物,根据其理化性质及波谱技术鉴定为土木香内酯和异土木香内酯。结论硝酸银硅胶色谱法对土木香内酯及异土木香内酯能实现满意分离,且产量大、纯度高、操作简单,是一种高效快速的制备方法,为土木香内酯及异土木香内酯的广泛应用提供精准可靠的参考资料。

茚二酮-硝酸银复合显现膜应用于纸质客体上潜手印的显现研究

指纹证据的研究一直是刑事科学的热点之一,其中潜在手印更是重中之重。潜在指纹的成分是由人体皮肤中各种腺体分泌的自然物质组成。基于指纹独一无二、终身基本不变的特性,该项目首先通过确定茚二酮、硝酸银化学试剂各自的最佳浓度,并将二者混合制备茚二酮-硝酸银复合显现膜作用于纸质客体上进行显现研究,同时观察遗留时间长短等因素的影响。通过探究茚二酮-硝酸银复合显现膜作用在打印纸,牛皮纸、相纸、滤纸等常见客体表面上潜在指纹显现的效果,以期更好地改进潜手印的显现方法,在显现潜手印方面获得效果稳定、应用范围广、操作简单、价格低廉具有较好应用前景的显现技术。

载银氧化壳聚糖的制备与抑菌性能研究

为制备一种高效抑菌剂,以壳聚糖(chitosan,CS)为原料,采用漆酶/2,2,6,6-四甲基哌啶-1-氧自由基(2,2,6,6-tetramethylpiperidine-1-oxyl,TEMPO)体系制备6-羧基壳聚糖(6-carboxyl chitosan,C-COS),然后与硝酸银反应制备载银氧化壳聚糖(silver-carried oxidized chitosan,C-COS-Ag),对其抑菌性能进行研究。结果表明,与CS相比,C-COS-Ag的抑菌效果明显提高,其对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别为(22.75±1.50)和(13.75±2.50)mm,最小抑菌质量浓度均为6.10μg·mL^(-1)。细菌生长曲线试验证实,C-COS-Ag能明显降低大肠杆菌和金黄色葡萄球菌的生长速率;细胞内容物渗透试验表明,C-COS-Ag能够破坏细菌的细胞膜和细胞壁形态,导致核酸、蛋白质等大分子物质渗出,碱性磷酸酶活性上升,β-半乳糖苷酶活性下降,半乳糖合成途径受阻,细菌正常代谢受到影响。以上研究结果为C-COS-Ag的应用提供了理论依据。

师范院校化学专业研究型实验教学体验课——以从含银废液中回收硝酸银项目为例

研究型实验教学是当前高校实验教学的研究热点。硝酸银是一种价格比较昂贵的试剂,从含银废液中回收硝酸银,不仅能解决环境污染问题,也能节约实验成本。该实验所需仪器设备简单,涉及的操作及过程中出现的问题等,学生也能够利用所学知识和技能有效解决。本文以含银废液为原料回收硝酸银为实验项目,让学生自己设计实验方案,并通过方案的实施,体验研究型实验教学的过程,达到培养学生科学研究意识的目的。

硝酸银滴定法和离子色谱法测定水中氯化物的比对分析

采用硝酸银滴定法和离子色谱法对水中氯化物进行测定,并对取样量、检测时间、精密度、准确度进行比对分析。结果显示,硝酸银滴定法取样量多,但测定时间相对较短;而离子色谱法取样量少,可实现多种离子的同时检测;两种方法的相对标准偏差分别为3.6%、0.5%,加标回收率分别为90.0%~107%、100%~110%,均满足质控要求。

消除化学需氧量测定时氯离子干扰的方法论述

化学需氧量(COD_(cr))作为一项衡量水体中有机污染物相对含量的综合指标,是水质监测中的重要因子。重铬酸盐法是测定化学需氧量(COD_(cr))最常用的方法,但其测定结果易受水样中氯离子浓度影响,介绍了4种消除氯离子干扰的方法:硫酸汞屏蔽法、氯气校正法、银盐抑制法及标准曲线校正法,同时对比了各自适用范围和优缺点,以供监测人员开展监测工作时能因地制宜选择合适的干扰消除方法以提高分析测试结果的准确度。

Preparation, characterization, and antibacterial activity of γ-irradiated silver nanoparticles in aqueous gelatin

Colloidal silver nanoparticles （Ag-NPs） were obtained through γ-irradiation of aqueous solutions containing AgNO3 and gelatin as a silver source and stabilizer, respectively. The absorbed dose of γ-irradiation influences the particle diameter of the Ag-NPs, as evidenced from surface plasmon resonance （SPR） and transmission electron microscopy （TEM） images. When the γ-irradiation dose was increased （from 2 to 50 kGy）, the mean particle size was decreased continuously as a result of γ-induced Ag-NPs fragmentation. The antibacterial properties of the Ag-NPs were tested against Methicillinresistant Staphylococcus aureus （MRSA） （Gram-positive） and Pseudomonas aeruginosa （P.a） （Gram-negative） bacteria. This approach reveals that the γ-irradiation-mediated method is a promising simple route for synthesizing highly stable Ag-NPs in aqueous solutions with good antibacterial properties for different applications.

Comparison of Antioxidant Activities of Silver Nanoparticles and Methanol Extracts of Three Indigenous Nigeria Herbal Seeds

The antioxidant of seeds was carried out using extracts from methanol and Silver Nanoparticles from the spice. The SEM shows the shapes, dispersion and agglomeration of the sample, while the EDX confirms the SEM and the presence of some compounds. The FT-IR reveals the AgNPs capping and reducing the particular biomolecule from the functional group for identification. Compounds found in the FT-IR seeds of Capsicum annum are Ag L (Silver iodide), C K (Cyanogen chloride), P K (Phenol). Monodora myristica are Mo L (Molybdenum), Ag L (Silver iodide), C K (Cyanogen chloride), P K (Phenol), Mg K (Magnesium). Piper guineense are Ag L (Silver iodide), Ci K (Potassium chloride), C K (Cyanogen chloride), P K (Phenol). The seeds show that the AgNPS of CA and MM has a better antioxidant activity than the methanol of CA and MM, while the PG methanol has a better activity than the AgNPS PG. The control (Catechin and Galic acid) has a slight overall better DPPH activity than the AgNPS. It is important to note that there is a concentration dependency in CA, MM AgNPS, PG methanol respectively. Notably, at CA methanol, the conc. at 125 was higher than the conc. at 250. Hence, there is need to create a great part in using plant samples for making tabulated or capsulated drugs for treatment of diseases and using plant silver nanoparticles to develop a healthy food/drug preservative package material “smart packaging” that will enhance shelf-life.

Zinc and Silver Salts-Containing Lamellar Titanium Phosphate: A Multifunctional Filler

Zinc and silver compounds have been studied because they have ultraviolet light barrier properties and bactericidal action, respectively. Materials with multifunctional characteristics have been sought to produce polymeric nanocomposites. In this work, the chemical modification of titanium phosphate (TiP) was carried out through a route with successive intercalations. TiP was synthesized and consecutively pre-expanded with ethylamine and pyromellitic acid. Then it was modified with zinc acetate and silver nitrate. The final product was characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, wide-angle X-ray diffractometry, field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and thermogravimetry. Infrared revealed dislocation and appearance of bands according to the intercalating agent. Inorganic salts interfered in the crystallization and melting processes of pyromellitic acid. Vanishing of the TiP hkl plane and variation and appearance of new crystallographic planes at low diffraction angles induced intercalation. SEM showed agglomerated structures. New thermal degradation events at higher temperatures endorsed the formation of zinc and silver carboxylate salts. We concluded that a new miscellaneous and multifunctional matter was achieved.

脉冲激光起爆光敏炸药特性

光敏炸药乙炔银-硝酸银加载技术是模拟强脉冲X射线结构响应的重要手段之一,采用脉冲激光起爆是一种不同于传统的闪光高压起爆方式,其优势在于增强了操作可控性、异型加载实现性和同时加载时效性。对激光起爆机理进行针对性分析,介绍激光起爆平台和乙炔银-硝酸银材料性质。针对光敏炸药的光吸收特性开展激光起爆实验,获得193 nm/266 nm/532 nm/1064 nm等波长激光起爆阈值分别为5.07 mJ/mm^(2)、6.77 mJ/mm^(2)、7.21 mJ/mm^(2)、10.61 mJ/mm^(2),并通过爆速验证完全爆轰过程,用辐射光谱分析表征反应过程元素生成。所得成果对于脉冲激光起爆过程、机理及爆炸载荷规律研究,以及光敏炸药模拟X射线结构响应加载技术具有很好的技术支持作用。