Chemie

2'-Desoxyisoguanosin: Synthese, Desoxygenierung und Einbau in Oligonucleotide

Diplomarbeit aus dem Jahr 1993 im Fachbereich Chemie - Organische Chemie, Note: 1,5, Universität Osnabrück, Sprache: Deutsch, Abstract: 1) 2'-Desoxyisoguanosin (1) wurde in einer zweistufigen Synthese dargestellt. Zu diesem Zweck wurde 2'-Desoxyguanosin (3) zunächst in 2-Amino-2'-desoxyadenosin (5) überführt. Dieses wurde in 2'-Desoxyisoguanosin (1) umgewandelt. Bei der Reaktion von 2'-Desoxyisoguanosin (1) mit Chloracetaldehyd bildete sich N6-Etheno-2'-desoxyisoguanosin (9). Dieses zeigte mit N6-Ethenoadenosin (6) vergleichbare Fluoreszenzeigenschaften. 2) 2',3'-Didesoxyisoguanosin (2) konnte über den photochemischen Austausch des 2-Substituenten von 2-Chlor-2',3'-didesoxyadenosin (20) dargestellt werden. Verbindung 20 konnte über zwei Synthesewege gewonnen werden: Anfänglich ausgehend von 2-Chlor-2'-desoxyadenosin (16) über Barton-Desoxygenierung in 27 % Gesamtaubeute über vier Stufen. Alternativ wurde in einem konvergenten Syntheseweg der 2',3'-Didesoxyzucker 21 mit 2,6-Dichlorpurin (23) unter Mitsunobu-Bedingungen umgesetzt. Durch nachfolgenden Austausch des 6-Substituenten gegen NH2 waren die anomeren 6-Amino-2-chlor-2',3'-didesoxynucleoside (25a, 25b) zugänglich. 3) Mit Hilfe der Festphasensynthese wurde das Oligomer d(iG-C)3 (32) synthetisiert und seine Zusammensetzung durch enzymatische Hydrolyse bewiesen. Anhand des Tm-Wertes von 29 °C konnte die iGd-dC-Basenpaarung nachgewiesen werden. Da alternierende iGd-dC -Sequenzen nur unter paralleler Strangorientierung selbstkomplementär sind, resultiert im Vergleich zu d(G-C)3 (33) der Verlust eines Basenpaares. Der parallele Duplex von d(iG-C)3 wies mit 29°C einen geringeren Tm-Wert als d(G-C)3 (45°C) auf. Mit Hilfe von Inkrementberechnungen für die freie Enthalpie pro Basenpaar, konnte bewiesen werden, daß diese Destabilisierung von d(iG-C)3 (32) durch die Einbuße eines Basenpaares ausgelöst wurde.

A physiochemical analysis of two varieties of the Tiger Nut

A Teacher's Guide on Complexometric Titration

Lesson Plan from the year 2019 in the subject Chemistry - Anorganic Chemistry, grade: A, , language: English, abstract: This laboratory material seeks to help fresh teachers of the UG-PG departments as well as self studying students. It eliminates the difficulties which are common in the starting stage of a teaching carrier regarding solution preparations in various concentrations, calculations and procedures for the experiments and the practical set up.Moreover, the work is helpful to understand the role of reagents/chemicals used in experiments, reactions, conditions and structures. The work will provide all the information related to the complexometric titrations.

Acetylsalicylsäure: Die Synthese des Medikamentes auf zwei verschiedenen Wegen sowie die Stoffeigenschaften

Facharbeit (Schule) aus dem Jahr 2022 im Fachbereich Chemie - Organische Chemie, Note: 1, , Sprache: Deutsch, Abstract: Entdecken Sie die faszinierende Welt der Acetylsalicylsäure (ASS) und begeben Sie sich auf eine Reise durch die chemischen Prozesse, die hinter diesem allgegenwärtigen Schmerzmittel stehen. Diese umfassende Facharbeit enthüllt die Geheimnisse der ASS-Synthese, indem sie zwei unterschiedliche Synthesewege detailliert untersucht und vergleicht. Von der sorgfältigen Isolierung der ASS aus handelsüblichen Tabletten bis hin zur präzisen Synthese im Labor werden alle Schritte anschaulich und nachvollziehbar dargestellt. Tauchen Sie ein in die Welt der organischen Chemie und erlernen Sie die Kunst der Reinheitsbestimmung, wobei Dünnschichtchromatographie und Schmelzpunktbestimmung als zuverlässige Werkzeuge zur Qualitätskontrolle dienen. Erfahren Sie, wie die chemischen Eigenschaften von ASS, ihre Struktur als Carbonsäure und Ester sowie ihre Reaktionen wie die Hydrolyse ihre Wirksamkeit und Stabilität beeinflussen. Die Arbeit beleuchtet nicht nur die theoretischen Grundlagen, sondern legt auch großen Wert auf die praktische Anwendung und die Bedeutung von Sicherheitsvorkehrungen im Labor. Durch den Vergleich der beiden Synthesewege werden Vor- und Nachteile aufgezeigt und Verbesserungspotenziale für eine optimierte Ausbeute und Reinheit diskutiert. Diese Abhandlung ist somit ein unverzichtbarer Leitfaden für angehende Naturwissenschaftler und alle, die ein tieferes Verständnis für die Chemie der Acetylsalicylsäure und die Prinzipien des wissenschaftlichen Arbeitens im Labor erlangen möchten. Lassen Sie sich von der Präzision und Sorgfalt dieser Untersuchung begeistern und erweitern Sie Ihr Wissen über die Welt der Moleküle und Reaktionen. Ob Student, Lehrer oder einfach nur neugierig - diese Arbeit bietet Ihnen einen fundierten Einblick in die Synthese, die chemischen Eigenschaften und die Reinheitsbestimmung von Acetylsalicylsäure und vermittelt gleichzeitig die essenziellen Grundlagen für sicheres und erfolgreiches Experimentieren.

Adsorption of Erichrome Black T using Activated Charcoal

Research Paper (undergraduate) from the year 2024 in the subject Chemistry - Other, grade: A, , language: English, abstract: The removal of Eriochrome Black T (EBT) dye from aqueous solutions using activated charcoal was investigated through batch adsorption studies. The effects of adsorption parameters such as initial dye concentration, adsorbent dose, and contact time were systematically examined. The results demonstrated that the adsorption capacity of activated charcoal increased with higher adsorbent doses and longer contact times, attributed to the availability of adsorption sites and extended interaction periods. Transmittance measurements, obtained using a colorimeter, indicated a significant reduction in dye concentration post-adsorption. These findings suggest that activated charcoal is an effective adsorbent for EBT dye removal, highlighting its potential application in industrial wastewater treatment processes. Colorimetric analysis using transmittance measurements provided quantitative evidence of significant dye concentration reduction after treatment, confirming effective adsorption. The adsorption process was rapid initially, followed by a slower phase as equilibrium approached, suggesting multilayer adsorption and a potential chemisorption mechanism. These findings were consistent with the behavior observed in other kinetic studies involving synthetic dyes.

Adsorption von Tensiden an festen Grenzflächen

Diplomarbeit aus dem Jahr 1991 im Fachbereich Chemie - Materialchemie, Werkstoffchemie, Note: Sehr gut, Heinrich-Heine-Universität Düsseldorf (Forschungszentrum Jülich ICH-4), Sprache: Deutsch, Abstract: Mit der Technik der oberflächenverstärkten Ramanspektroskopie (SERS) wurde das Adsorptionsverhalten verschiedener, auch deuterierter, Trimethylammonium-Kationentenside an Silberelektroden untersucht.

An analysis on the dendral expert system

Seminar paper from the year 2013 in the subject Chemistry - Organic Chemistry, Lovely Professional University, Punjab (School of computer science), course: MTech C.S.E, language: English, abstract: In this paper, we do an analysis on the influential pioneer project in the application area of Heuristic programming for experimental analysis in empirical science using IUPAC conventions. The primary aim of the DENDRAL project was to help organic chemists in identifying unknown organic molecules from compounds extracted from known origin that had medicinal or utility value. The process was done by analysing their mass spectra and then undergoing comparative study using knowledge of chemistry. It was done at Stanford University by Edward Feigenbaum, Bruce Buchanan, Joshua Lederberg, and Carl Djerassi. It began in 1965 and spans approximately half the history of AI research. The DENDRAL Project was one of the first large-scale programs to embody the strategy of using detailed, task-specific knowledge about a problem domain as a source of heuristics, and to seek generality through automating the acquisition of such knowledge.

Analyse der Wasserhärte in Bezug auf die geomorphologische Entwicklung

Facharbeit (Schule) aus dem Jahr 2011 im Fachbereich Chemie - Sonstiges, Note: 1.7, , Veranstaltung: Leistungskurs Chemie, Sprache: Deutsch, Abstract: Jedes Kind ist mit dem Element Wasser vertraut. Es hat mit viele charakteristische und einzigartige Eigenschaften. Es bedeckt die Erdoberfläche zu 71% , was der Erde seinen, allgemein bekannten, Namen "Blauer Planet" verschafft. Auch entstammen die ersten Lebensformen den Meeren. Zusätzlich hat "[der] Mensch (...) das Wasser für viele Zwecke nöthig" , denn es ist großer Bestandteil des menschlichen Körpers und ist unter anderem für den Nährstofftransport, Aufbau von Organen und Kühlung des Körpers durch Schwitzen unabkömmlich. Aufgrund der Teilnahme an wichtigen biochemischen Prozessen ist es nötig, dass das, dem Körper zugeführte Wasser rein und mit möglichst wenig schädlichen Stoffen versehen ist. Deswegen schaffen diese Umstände Anreiz diese Flüssigkeit näher zu betrachten und sich die stets darin gelösten Verbindungen näher anzusehen, mit einem Fokus auf die ErdalkaliIonen, die so genannten Härtebildner. Alle diese im Wasser gelösten Ionen bzw. ihre Salze stellen die Härte des Wassers dar. Dabei ist die Konzentration der Magnesium(Mg2+)- und Calci-um(Ca2+)-Ionen Ausschlag gebend, denn Barium und Strontium sind nur in sehr geringen Anteilen vorhanden. Dabei steht eine geringe Konzentration der Ionen für ein weiches Wasser, welches für den menschlichen Organismus besser verträglich ist und auch in Haushaltsgeräten weniger Spuren hinterlässt. Eine hohe Konzentration steht im Gegenzug für hartes Wasser, welches für den menschlichen Organismus weniger gut ist und auch bei den Haushaltsgeräten zu schnelleren und stärken Kalkablagerungen führt, wenn die Ionen sich ablagern. Der Begriff der Härte des Wassers muss noch etwas feiner gegliedert werden, denn "[d]iese selbst unterscheidet man gewöhnlich in Gesamthärte, d. i. die Härte, welche das frisch geschöpfte Wasser zeigt, und in permanente Härte, diejenige, welche sich noch im gekochten Wasser zeigt; die Differenz beider pflegt man als vorübergehende Härte zu bezeichnen."

Analyse von Koffein und Taurin in Energy-Drinks

Wissenschaftliche Studie aus dem Jahr 2015 im Fachbereich Chemie - Biochemie, , Sprache: Deutsch, Abstract: Analytische Untersuchung ausgewählter Energy-Drinks durch HPLC-Chromatographie. Bestimmung der absoluten Konzentrationen von Koffein und Taurin und Darstellung der HPLC-Chromatogramme.

Anti HIV Drugs. Non-Nucleoside Reverse Transcriptase Inhibitors

Assessment of Cadmium in Chicken Meat and Offal. Food Safety and Food Poisoning

Project Report from the year 2015 in the subject Chemistry - Food Chemistry, grade: A, University of Ibadan, course: Zoology, language: English, abstract: This study was carried out on the evaluation of cadmium in chicken meat and offal in Bodija, Sango and Ojoo markets in Ibadan between July and October, 2015. The appraisal was aimed at assessing the cadmium that can be accumulated in the kidney, liver, intestine, blood, muscle and the feathers. Ten mature chickens were bought and dissected to remove the chicken meat and offal samples. This samples were oven-dried separately and pulverised into powdered form through grinding with a mortar and pestle. These were acid-digested for cadmium analyses using Buck Scientific 210 VGP Atomic Absorption Spectrophotometer. The results showed varying mean concentrations in the intestine (0.713±0.024 ppm), feather (0.702±0.035 ppm) and muscle (0.592±0.019 ppm) with low mean concentrations in the blood (0.426±0.032 ppm), liver (0.432±0.021 ppm) and kidney (0.352±0.027 ppm). Most of the chicken meat and offal samples were above the WHO guideline limit of 0.05 ppm. The Target Hazard Quotient (THQ) from the study was below 1 which is indicative that the general populace in this study area is not at risk. It is therefore recommended that regular biomonitoring should be carried out on chicken meat and offal locally and globally for the purpose of food safety.

Bioanorganische Chemie

Biochemical Characterization of Cotton Hybrids and their Parents

Master's Thesis from the year 2022 in the subject Chemistry - Bio-chemistry, , course: biochem-599 - Agriculture, language: English, abstract: Unlock the secrets hidden within the genetic tapestry of cotton! Venture into the intricate world of Gossypium hirsutum and discover the biochemical keys that unlock superior hybrid vigor. This groundbreaking work meticulously dissects the biochemical composition of cotton hybrids and their parent lines, revealing the subtle yet significant differences that drive yield and fiber quality. Explore a comprehensive analysis of key biochemical parameters, including reducing sugar, total soluble sugar, protein content, proline levels, tannin concentrations, gossypol percentages, total phenol content, flavanol measurements, iodine value, and seed oil content. Through rigorous experimentation and detailed analysis, this study unveils the intricate relationships between these biochemical markers and crucial agronomic traits, providing invaluable insights for cotton breeders and researchers alike. Delve into the methodologies employed, from experimental design to precise biochemical assays, ensuring reproducibility and reliability of the findings. Discover how these biochemical fingerprints can be used to identify superior genotypes, optimize breeding strategies, and ultimately enhance cotton production. This research not only illuminates the biochemical underpinnings of hybrid cotton performance but also paves the way for developing climate-resilient and high-yielding varieties, addressing the growing global demand for this essential crop. Whether you're a seasoned cotton breeder, a plant biochemist, or simply fascinated by the science of crop improvement, this book offers a compelling journey into the heart of cotton genetics and the future of sustainable agriculture, offering a comprehensive understanding of cotton breeding through biochemical characterization, and pushing the boundaries of agricultural innovation.

Biochemistry: A Very Short Introduction

Very Short Introductions: Brilliant, Sharp, Inspiring From the simplest bacteria to humans, all living things are composed of cells of one type or another, all of which have fundamentally the same chemistry. This chemistry must provide mechanisms that allow cells to interact with the external world, a means to power the cell, machinery to carry out varied processes within the cell, a structure within which everything runs, and also governance through a web of interlocking chemical reactions. Biochemistry is the study of those reactions, the molecules that are created, manipulated, and destroyed as a result of them, and the massive macromolecules (such as DNA, cytoskeletons, proteins and carbohydrates) that form the chemical machinery and structures on which these biochemical reactions take place. It didn't take long for an understanding of the chemistry of life to turn into a desire to manipulate it. Drugs and therapies all aim to modify biochemical processes for good or ill: Penicillin, derived from mould, stops bacteria making their cell walls. Aspirin, with its origins in willow bark, inhibits enzymes involved in inflammatory responses. A few nanograms of botulinum toxin (botox), can kill by preventing the release of neurotransmitters from the ends of nerves and so leads to paralysis and death, or give a wrinkle free forehead (if administered in very tiny quantities).This Very Short Introduction discusses the key concepts of biochemistry, as well as the historical figures in the field and the molecules they studied, before considering the current science and innovations in the field, and the interaction between biochemistry, biotechnology, and synthetic biology. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.

Bioorganische Chemie

Captura de CO2 Mediante Adsorbentes Silíceos Mesoestructurados Funcionalizados con Grupos Amino

Characterization of histone modifying enzymes and their substrates in maize

Doctoral Thesis / Dissertation from the year 2007 in the subject Chemistry - Bio-chemistry, grade: Doctorate, University of Innsbruck (Institute of Molecular Biology), language: English, abstract: The maize ZmHda1 is a class II, HDA1-like histone deacetylase. ZmHda1 has been purified to homogeneity and found to be a 48 kDa monomeric protein (Brosch et al., 1996a). However, ZmHda1 specific antibodies can detect two other protein bands of molecular sizes of 84 and 65 kDa on immunoblots indicating that ZmHda1 exists natively in different molecular forms. These two protein forms of ZmHda1 are found in protein complexes of high molecular weights and they are enzymatically inactive (Pipal et al., 2003). Attempts to identify the protein components of the ZmHda1 protein complexes have been made. The second part of this study showed that histone methylation profile in maize embryos quantitatively and qualitatively changes as the germination progresses from 0 to 72 h. The total and chromatin unbound HMT activity decrease during the germination progress, while the chromatin bound HMT activity increases. This increase was most remarkable as an increase in methylation of H4K20 residue and to a lesser extent in mono- and tri- methylated H3K9 and dimethylated H3K36. With the progress of germination, the decrease in dimethylated H3K9 was remarkable. The decrease in H3K4 methylation and dimethylated H4R3 was less pronounced. Seven different histone methyltransferase activities could be separated from the 72h maize embryos; three of them were chromatin bound and four were found soluble in the cytoplasmic extract. Two of the chromatin bound activities, AI and AII2 methylate histone H3. AII2 showed H3K9 specificity and has a molecular size of 67 kDa. The third chromatin bound HMT activity, AII1, has a molecular size of 120 kDa and is H4 specific. Purification schemes could not yield purification of these activities to homogeneity; however, LC-MS/MS analysis of a chromatographic fraction containing the AII1 activity showed that it might have a homology to a putative SAM-dependent methyltransferase from Rhodobacter sphaeroides. Histone H3 is methylated by two activities from 72h maize embryos cytoplasmic extract; BI which has a molecular size of 30 kDa and another uncharacterized activity form. BII, from 72h embryos cytoplasmic extract, was purified to homogeneity using a series of FPLC chromatographic steps followed by native PAG. BII has been identified by nano-LC-MS/MS as a homologue of PRMT5, a type II PRMT and hence BII is referred to as ZmPRMT5.

Chemical Horizons: Research and Development

Scientific Study from the year 2024 in the subject Chemistry - General, , language: English, abstract: The world is rapidly evolving due to advancements in science, technology, and research. Chemical Sciences, in particular, have played a pivotal role in driving these changes. Over the course of seven chapters, this book attempts to highlight some significant advancements in this discipline. Our extreme contributors to this book deserve a great deal of praise for their efforts. These are the chapters that make up this edited book.Chapter 1- A Mini Review on Green Synthesis of Dihydropyrimidinones/thiones via Biginelli Reaction by Dr. Murshida KarimChapter 2- Carbon Nanomaterials for Renewable Energy Applications by Dr. Monmi Saikia and Trisha DuttaChapter 3- Tert-amino effect: Synthesis of nitrogen heterocycles by Dr. Biswajita BaruahChapter 4- Assessment of Antioxidant Potential of some Indigenous Medicinal Vegetables of Northeast India by Dr. Manas Pratim BoruahChapter 5- A facile method for synthesis of triazoles using copper nano particles supported on Montmorillonite by Dr. Mitali ChetiaChapter 6- Artemisinin is a Sesquiterpene lactone: Remedy for Malaria and Cancer by Dr. Bishwajit SaikiaChapter 7- A study of some important medicinal plants in Manipur by Dr. Malabika Borah and Mr. Ankur ChoudhuryWe extend our sincere gratitude to the contributors of each chapter, whose invaluable contributions form the backbone of this book. We hope this book will ignite the passion of aspiring researchers and motivate them to delve deeper into the realm of science.

Chemical Reactivity and Bioactivity Rates Of Marine Peptides Hemiasterlin Derivatives. Cancer Treatment Through Conceptual Density Functional Theory

Seminar paper from the year 2020 in the subject Chemistry - Bio-chemistry, , language: English, abstract: This study involved the assessment of the MNI2SX/Def2TZVP and the MNI2SX models to enhance the understanding of the structural composition of marine peptide Hemisterline derivatives A and B used in cancer treatment.The Conceptual Density Functional theory was used in the calculation of molecular properties of the system chemical descriptors during the study. Integration of the active molecular regions into their respective Fukui functions was used in the selection of radical, electrophilic, and nucleophilic attacks.Additionally, the proposed correlation between global hardness and the pKa was used as the basis of deriving accurate predictions for the pKa values while a homology technique was used in the prediction of bioactivity and bioavailability scores of the peptides under investigation.

Chemistry in a Shopping Trolley. Ascorbic acid Concentrations of fresh orange, fresh lemon, store-bought orange juice, store-bought lemon juice and a Berocca tablet

Scientific Study from the year 2016 in the subject Chemistry - Food Chemistry, grade: 12, , language: English, abstract: The concentration of Ascorbic acid in lemons, oranges, lemon juice, orange juice and a Berocca tablet were calculated to determine the best way to receive the recommended daily intake of Ascorbic acid. This experiment was conducted to decide the best source of Ascorbic acid for pregnant women, which is available from a supermarket. The concentrations were finalised by titrating the five substances and then calculating the concentration of Ascorbic acid. It was found that lemons had the highest concentration of Ascorbic acid, which was 0.6175mol/L. The fresh lemon was followed by the Berocca tablet, which had a concentration of 0.585mol/L, lemon juice with 0.5625mol/L, orange with 0.105mol/L, and finally orange juice, which had 0.095mol/L. While the lemon had the highest concentration, it was decided that fresh oranges were the best source of Ascorbic acid for pregnant women. These findings are significant because many pregnant women do not receive the recommended daily intake of Ascorbic acid, which has detrimental health impacts on themselves, and their child.

Chemistry of Heterocyclic Compounds

Scientific Study from the year 2018 in the subject Chemistry - Organic Chemistry, grade: A, , language: English, abstract: Heterocyclic chemistry is one of the largest branches of chemistry. Well over six million discrete heterocyclic compounds are known, reflecting their central and important role in Science and Technology. The usefulness of heterocycles is due to their combination of compact and robust molecular structures with a high degree of molecular diversity that results in properties, which can be finely adjusted to the needs of sophisticated applications. This is well illustrated by the functions of many naturally occurring heterocycles that are essential components of living cells, including DNA in which specific nitrogen heterocycles are directly responsible for encoding all genetic information. Morphine and quinine, two of the earliest compounds to be used in therapy and in use today, are both heterocyclic natural products. William Perkin's synthesis of the lucrative quinine molecule in 1856 led to the discovery of an important synthetic heterocycle, mauveine, and this laid the foundation of the synthetic dye industry. This in turn gave birth to the modern industry when in 1932 the antibacterial properties of the dye lead to the discovery of heterocyclic sulfapyridines. These antibacterial agents were the first major life saving synthetic drugs and they quickly had a dramatic effect on the quality of life.

Cleaning ability of Washing Powders

Research Paper (undergraduate) from the year 2015 in the subject Chemistry - Other, grade: A, , course: IB Chemistry HL, language: English, abstract: I researched and studied the effect of temperature and concentration of the detergent, Sodium Lauryl Sulphate, on the cleaning ability of various popular washing powders, in terms of surface tension. Furthermore, it was the minimum concentration of LAS that must be present and maximum value of the surface was determined.I researched and found that the cleaning ability is a function of the surface tension and that washing powders contain surfactants or detergents like Sodium Lauryl Sulphate (LAS) that lower the surface tension. Surface tension causes the surface portion of liquid to be attracted to another surface. Thus lowering the surface tension allows the water to spread further and can penetrate into the holes and pores of the surface giving a better cleaning performance. However, these detergents only work if they are at their Critical Micelle Concentration. Keeping the CMC of LAS in mind, I took different concentrations of it so as to find the maximum value of surface tension that must be passed for effective cleaning.

Comparison of Honey Quality of Kangra and Bilaspur District of Himachal Pradesh

Academic Paper from the year 2015 in the subject Chemistry - Food Chemistry, , language: English, abstract: India is the second largest honey producer and exporter in the world, plays an important role in world honey production and trade. The total production of honey in India is approx. 27000MT per year and the maximum production of honey in India comes from the forests.In Himachal Pradesh the total honey production is about 120MT per year. Honey has been used by man in various ways since times immemorial. It contains more than so different substances but 95-99,5% of the total solids and sugars. The color, aroma, flavor, texture are the important quality characteristics of honey. Besides this, honey is prized for.

Compuestos de Coordinación de Manganeso(II) y Calcio(II) con 2,2'-Bipiridina y 1,10-Fenantrolina para su Uso Potencial en Sistemas de Fotosíntesis Artificial