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Dissolution of fluorite colloid particles coated with sodium poly(4-styrenesulphonate)
No full textPraćena je kinetika otapanja čestica fluorita u vodi prije i nakon prekrivanja natrijevim poli(4-stirensulfonatom) pri nekoliko različitih pH vrijednosti pomoću fluoridne (F-ISE) i kalcijeve ion-selektivne elektrode (Ca-ISE), pH elektrode te konduktometrijski. Pomoću metoda dinamičkog i elektroforetskog raspršenja svjetlosti praćena je veličina odnosno elektrokinetički potencijal čestica tijekom otapanja. Prisutnost natrijeva poli(4-stirensulfonata) na česticama nakon adsorpcije potvrđena je UV-Vis spektrofotometrijom i elektroforetskim raspršenjem svjetlosti. Mjerenja s ISE pokazala su da se prekrivene čestice otapaju sporije od neprekrivenih, dok su mjerenja provodnosti pokazala suprotno. Mjerenja s F-ISE ukazuju da brzina otapanja neprekrivenih čestica ne ovisi o pH vrijednosti, dok mjerenja s Ca-ISE ukazuju na smanjenje brzine s povećanjem pH. Mjerenjima s ISE uočeno je da se prekrivene čestice otapaju najbrže pri pH = 4, a bez značajne međusobne razlike pri pH = 6 i pH = 8. Mjerenja provodnosti potvrđuju smanjenje brzine otapanja s porastom pH vrijednosti za neprekrivene i prekrivene čestice.The dissolution kinetics of fluorite particles in water were studied before and after coating with sodium poly(4-styrenesulfonate) at various pH values using fluoride (F-ISE) and calcium ion- selective electrodes (Ca-ISE), a pH electrode, and conductometrically. Dynamic and electrophoretic light scattering were used to measure particle size and electrokinetic potential during dissolution. The presence of sodium poly(4-styrenesulfonate) on particles was confirmed by UV-Vis spectrophotometry and electrophoretic light scattering. ISE measurements indicated that coated particles dissolve more slowly than uncoated ones, whereas conductivity measurements showed the opposite. F-ISE data suggested that the dissolution rate of uncoated particles is pH-independent, while Ca-ISE data indicated a decrease in rate with increasing pH value. ISE measurements showed that coated particles dissolved fastest at pH = 4, with no significant difference between pH = 6 and
pH = 8. Conductivity measurements confirmed a decrease in dissolution rate with increasing pH for both coated and uncoated particles
Synthesis and characterization of vanadium(V) metallosupramolecular compounds with hydrazone ligands
No full textU ovom diplomskom radu istražene su reakcije oksobis(pentan-2,4-dionato)vanadija(IV) i salicilaldehid izonikotinoil hidrazona (H2SIH), odnosno salicilaldehid nikotinoil hidrazona (H2SalNH) s metanolom, etanolom i propanolom. U reakcijama s ligandom H2SIH sintetizirani su tetramer [VO(SIH)(MeO)]44CH3OH, monomer [VO2(HSIH)] i polimer [VO(SIH)(PrO)]n. Reakcijama između oksobis(pentan-2,4-dionato)vanadija(IV) i H2SalNH u metanolu, etanolu i propanolu sintetizirani su monomer [VO(SalNH)(OMe)(HOMe)] te polimeri [VO(SalNH)(OEt)]n i [VO(SalNH)(OPr)]n. Spojevi su identificirani na temelju podataka dobivenih infracrvenom spektroskopijom, termogravimetrijskom analizom, difrakcijom rentgenskog zračenja na jediničnom kristalu te u polikristalnom uzorku.In this thesis, the reactions of oxobis(pentan-2,4-dionato)vanadium(IV) with salicylaldehyde isonicotinoyl hydrazone (H2SIH) and salicylaldehyde nicotinoyl hydrazone (H2SalNH) with methanol, ethanol, and propanol were investigated. In the reactions with the H2SIH ligand, the tetramer [VO(SIH)(MeO)]4·4CH3OH, the monomer [VO2(HSIH)], and the polymer [VO(SIH)(PrO)]n were synthesized. Reactions between oxobis(pentan-2,4- dionato)vanadium(IV) and H2SalNH in methanol, ethanol, and propanol yielded the monomer [VO(SalNH)(OMe)(HOMe)] and the polymers [VO(SalNH)(OEt)]n and [VO(SalNH)(OPr)]n. The compounds were identified based on data obtained from infrared spectroscopy, thermogravimetric analysis, single-crystal X-ray diffraction, and powder X-ray diffractio
Azuma's inequality and its applications
No full textU ovom radu bavili smo se Azuminom nejednakosti i njenim primjenama u kombinatorici. Sama Azumina nejednakost vezana je uz specifičnu vrstu slučajnih procesa, martingale. Uzmemo li sada martingal čiji su prirasti ograničeni, tada Azumina nejednakost daje ogradu na vjerojatnost događaja da ćemo nakon koraka otići "daleko" od očekivanja. U prvom poglavlju uveli smo teorijski pojam martingala i dali neke rezultate vezane uz njih. Nadalje, dokazali smo Azuminu nejednakost te usporedili nju i Černovljevu nejednakost s poznatom Markovljevom i Čebiševljevom ogradom. Također, obradili smo nekoliko poboljšanja glavne nejednakosti u nekim specifičnim slučajevima.\par Na kraju smo obradili neke primjene Azumine nejednakosti u kombinatorici. Primjeri su bili vezani uz slučajne grafove i kromatski broj, te takozvane pseudo-Booleove funkcije.In this paper, we focused on Azuma's inequality and its applications in combinatorics. Azuma's inequality itself is related to a specific type of stochastic process, martingales. If we take a martingale with bounded increments, Azuma's inequality provides an upper bound on the probability that, after steps, we will be "far" from the expected value. In the first chapter, we introduced the theoretical concept of martingales and presented some results related to them. Furthermore, we proved Azuma's inequality and compared Azuma's and Chernoff's inequalities with the well-known Markov and Chebyshev bounds. We also explored several improvements to the main inequality in certain specific cases.\par Finally, we examined some applications of Azuma's inequality in combinatorics. All examples were related to random graphs, the chromatic number, and so-called pseudo-Boolean functions
DYNAMICS AND PROPERTIES OF ORGANIC MATTER IN THE CHANGING MARINE ENVIRONMENT OF ROGOZNICA LAKE – ZMAJEVO OKO (CROATIA)
No full textOrganski ugljik je važan indikator globalnih promjena te važna komponenta u biogeokemijskim procesima u morskom okolišu. Ovaj rad istražuje promjene u kvalitativnim i kvantitativnim svojstvima organske tvari (OT), kompleksne smjese organskih spojeva s različitim karakteristikama koje se mijenjaju pod utjecajem promjenjivih okolišnih uvjeta u jedinstvenom, raslojenom euksinskom morskom okruženju Rogozničkog jezera - Zmajeva oka (RJ) na istočnoj obali Jadranskog mora. RJ pruža brz odgovor na okolišne promjene, što ga čini idealnim za istraživanje brojnih biogeokemijskih procesa uzrokovanih tim promjenama. Primjetne promjene uključuju zagrijavanje vodenog stupca, deoksigenaciju, te akumulaciju toksičnih sulfida i amonijaka. Dugoročna analiza (1996. - 2020.) OT u RJ pokazuje specifičnu dinamiku OT, uključujući akumulaciju čestičnog organskog ugljika (POC, engl. particulate organic matter) u vodenom stupcu i otopljenog organskog ugljika (DOC, engl. dissolved organic matter) u anoksičnom pridnenom sloju. Potvrđene su kvantitativne i kvalitativne promjene OT sukladno elektrokemijskim mjerenima površinski aktivnih tvari (PAT), kao najreaktivnije skupine spojeva organskog ugljika. Elektrokemijska analiza, posebno parametar normalizirane površinske aktivnosti (NPA), pokazala se pouzdanim indikatorom promjena u DOC-u morskog okoliša. Načela karakterizacije OT ispitana su i u eutrofnim uzorcima (uzorci obogaćeni s DOC-om i POC-om do 320 mg L-1 i PAT-om do 15 mg L-1) s područja sjevernog i srednjeg Jadrana, dodatno i po prvi puta koristeći stabilne izotope δ13C, δ15N i δ34S, te C : N i C : S omjere. Na temelju rezultata ove radnje, predložena je gruba granica hidrofilnosti-hidrofobnosti OT (NPA = 0,083). NPA vrijednosti iznad ove granice ukazuju na hidrofobniju i reaktivniju OT, dok vrijednosti ispod nje upućuju na prisutnost hidrofilnije i inertnije OT. Također su ispitana optimizirana voltametrijska mjerenja PAT-a na potenciostatu novije generacije bez fazne osjetljivosti kako bi se osigurala dosljednost mjerenja PAT na modernim instrumentima.Organic carbon serves as a crucial indicator of global change, participating in diverse biogeochemical processes within marine environments. This study investigates changes in the qualitative and quantitative properties of organic matter (OM), a complex mixture of organic compounds with varying characteristics that respond to changing environmental conditions in the unique, stratified eutrophic marine environment of Rogoznica Lake – Zmajevo oko (RL) on the eastern coast of the Adriatic Sea. RL exhibits rapid responses to environmental changes, rendering it ideal for studying numerous biogeochemical processes influenced by these changes. Noteworthy changes include water column warming, deoxygenation, and the accumulation of toxic sulfides and ammonia. Long-term analysis (1996 - 2020) of RJ reveals specific dynamics of OM, including the accumulation of particulate organic carbon (POC) in the water column and dissolved organic carbon (DOC) in the anoxic bottom layer. Quantitative and qualitative changes in OM, particularly related to surface active substances (SAS), the most reactive subset of organic carbon, have been confirmed. Electrochemical analysis, especially the parameter of normalized surface activity (NSA), has proven to be a reliable indicator of changes in marine DOC. Principles of OM characterization were further examined in eutrophic samples (up to 320 mg L-1 od DOC and POC and SAS up to 15 mg L-1) from the northern and central Adriatic, using stable isotopes δ13C, δ15N, and δ34S, as well as C : N and C : S ratios, to investigate the origin of OM and biogeochemical processes in the studied marine ecosystems. Based on the dissertation's findings, a rough threshold of hydrophilicity-hydrophobicity of OM (NSA = 0.083) is proposed. NSA values above this threshold indicate more hydrophobic and reactive OM, while values below it suggest the presence of more hydrophilic and inert OM. Additionally, optimized voltammetric measurements of SAS on a phase-insensitive potentiostat of the latest generation were examined to ensure measurement consistency of SAS in modern instruments
Study of interactions of amino-substututed tetracyclic imidazo [4,5-b] pyridines with zinc and copper(II) ions using mass spectrometry
No full textNedavno je sintetiziran novi niz tetracikličkih derivata imidazo[4,5-b]piridina kao potencijalnih antiproliferativnih sredstava. Na njihovu antiproliferativnu aktivnost protiv ljudskih stanica raka utjecalo je uvođenje odabranih amino bočnih lanaca na različite položaje na tetracikličkom skeletu, a posebno na položaj atoma dušika u jezgri piridina. Nekoliko spojeva pokazalo je izražene citostatske učinke u submikromolarnom području, posebice na stanice raka HCT116 i MCF-7. Izabrano je 4 novosintetiziranih spojeva za analizu nekovalentnih interakcija s metalnim ionima (cinkov i bakrov(II) ion) pomoću spektrometrije masa uz ionizaciju elektroraspršenjem. Na temelju dobivenih spektara predložene su strukture kompleksa izabranih spojeva s bakrovim(II) ionom i predložene su strukture kompleksa izabranih spojeva sa cinkovim(II) ionom. Rezultati ovog diplomskog rada mogli bi poslužiti za procjenu nekovalentnih interakcija izabranih spojeva s metalnim ionima (cinkov i bakrov(II) ion) u budućoj primjeni predmetnih spojeva u studijama djelovanja u stanici, ali i kao potencijalni novi spojevi za daljnja istraživanja i primjenu u medicini.A new series of tetracyclic imidazo[4,5-b]pyridine derivatives have been synthesized as potential antiproliferative agents. Their antiproliferative activity against human cancer cells was influenced by the introduction of selected amino side chains to different positions on the tetracyclic skeleton, especially to the position of the nitrogen atom in the pyridine core. Several compounds showed pronounced cytostatic effects in the submicromolar range, especially on HCT116 and MCF-7 cancer cells. 4 newly synthesized compounds were selected for analysis of non covalent interactions with metal ions (zinc and copper(II) ions) using mass spectrometry with electrospray ionization. The structures of the complexes of the selected compounds with copper(II) ion and stuctures of the complexes of the selected compounds with zinc(II) ion were proposed. The results of this thesis could be used to evaluate the non-covalent interactions of selected compounds with metal ions (zinc and copper(II) ions) for the eventual application of the compounds in question in studies of their action in the cell, but also as potential new compounds for further research and application in medicine
Investigation of the influence of plastic deformation on binary tellurides
No full textProvedena su mjerenja NMR rezonantne frekvencije i spin-rešetka relaksacijskog vremena jezgre 207Pb u ovisnosti o temperaturi na monokristalnom uzorku olovova telurida (PbTe). Napravljena su i transportna mjerenja otpora i Hallova efekta. Mjerenja su provedena na netaknutom uzorku te su ponovljena nakon plastične deformacije iznosa 3 %. NMR pomak u nedeformiranom uzorku ne pokazuje značajnu temperaturnu ovisnost. Nakon deformacije, dolazi do pomaka rezonantne frekvencije za iznos reda veličine 0.1 %, no temperaturna je ovisnost i dalje vrlo slaba. Spin-rešetka relaksacijsko vrijeme T1 u nedeformiranom uzorku prati temperaturnu ovisnost za poluvodiče. Vrijeme T1 nakon deformacije smanjuje se i pokazuje metalno ponašanje opisano Korringinom relacijom. Transportna mjerenja otpora prije i poslije deformacije pokazuju kvadratnu ovisnost o temperaturi (R ∝ T 2 ), bez aktivacije na nižim temperaturama. Deformirani uzorak ima znatno veći rezidualni otpor koji ne teži u nulu sa smanjenjem temperature. Porast otpora s temperaturom blaži je u deformiranom uzorku u odnosu na nedeformirani. Mjerenjem Hallova koeficijenta, koji je pozitivnog predznaka, utvrđujemo da gustoća nosilaca naboja (šupljina) ne ovisi značajno o temperaturi. U deformiranom uzorku iznos Hallova koeficijenta smanjuje se, dakle gustoća nosilaca naboja je veća. Plastična deformacija monokristalnog uzorka čistog PbTe, na temelju mjerenja nuklearne magnetske rezonancije i transportnih mjerenja, uzorak čini boljim metalom.NMR resonant frequencies and spin-lattice relaxation times of nucleus 207Pb were measured as a function of temperature on a single crystal sample of lead telluride (PbTe). Transport measurements of resistance and Hall effect were also performed. The measurements were carried out on a pristine sample and repeated after plastically deforming it by 3 %. The NMR shift in the undeformed sample does not show significant temperature dependence. After deformation, there is a change in the resonant frequency by an order of magnitude 0.1 %, but the temperature dependence remains very weak. The spin-lattice relaxation time T1 in the undeformed sample follows the temperature dependence typical for semiconductors. The T1 time decreases after deformation and shows metallic behavior described by the Korringa relation. Transport measurements of resistance before and after deformation show a quadratic temperature dependence (R ∝ T 2 ), without activation at lower temperatures. The deformed sample has a significantly higher residual resistance that does not tends to zero as the temperature decreases. Increase of resistance with temperature is more gradual in the deformed sample compared with the undeformed one. By measuring the Hall coefficient, which has a positive sign, it is determined that the charge carrier (holes) density does not significantly depend on temperature. In the deformed sample, the Hall coefficient decreases, indicating that the charge carrier density is higher. Plastic deformation of the single crystal sample of pure PbTe, based on nuclear magnetic resonance and transport measurements, makes the sample a better metal
Photophisical characterization of quinazoline derivates: potential for WOLED technology
No full textKinazolinski spojevi specifičnog tipa strukture koja ima elektron-donorski i elektron-privlačeći dio su pogodni za molekulski dizajn ciljanih svojstava. U okviru ovog rada provedena je spektroskopska karakterizacija kinazolinskih derivata u različitim otapalima i krutom stanju. Određivana su fotofizička svojstva spojeva, a posebno se ispitao utjecaj protonacije s obzirom na položaje elektron-donorskih supstituenata u odnosu na elektron deficijentni (akceptorski) kinazolinski kromofor. Stacionarnom fluorimetrijom određeni su relativni i apsolutni kvantni prinosi fluorescencije spojeva u otopinama, odnosno u krutim uzorcima u integracijskoj sferi. Određeno je vrijeme života fluorescencije spojeva metodom vremenski koreliranog brojanja pojedinačnih fotona. Iz emisijskih spektara spojeva određene su kromatične koordinate prema CIE 1931 sustavu boja (fr. Commission Internationale de l'Éclairage). Laserskom pulsnom fotolizom ispitana su dodatna fotofizička svojstva kroz detekciju tranzijenata. Na temelju dobivenih rezultata fotofizičkih svojstava spojeva, predložene su nove molekulske strukture za sintezu, potencijalni emiteri bijele svijetlosti usmjereni za primjenu u uređajima WOLED (eng. White Organic Light-Emitting Diode).Quinazoline compounds with a specific structure that has both electron-donating and electron-accepting parts are suitable for molecular design targeting specific properties. This master thesis features the spectroscopic characterization of quinazoline derivatives in different solvents and in the solid state. The photophysical properties of these compounds were determined, with particular focus on the effect of protonation with respect to the positions of the electron- donating substituents in relation to the electron-deficient (accepting) quinazoline chromophore. Steady-state fluorimetry was used to determine the relative or absolute fluorescence quantum yields of the compounds in solutions or solid samples within an integrating sphere. The fluorescence lifetimes of the compounds were determined using the time-correlated single- photon counting method. The color coordinates were calculated from the emission spectra of the compounds according to the CIE 1931 color system (fr. Commission Internationale de l'Éclairage). Further photophysical properties were investigated by laser flash photolysis technique. Based on the results obtained on the photophysical properties of the compounds, new molecular structures were proposed for synthesis as potential white light emitters for application in WOLED devices (White Organic Light-Emitting Diodes)
Jordanovi homomorfizmi strukturnih matričnih algebri
No full textJordan homomorphisms between two associative algebras are linear maps which preserve squares. This dissertation studies Jordan homomorphisms between structural matrix algebras (SMAs), which are unital subalgebras of (the algebra of all complex square matrices of order ) spanned by some set of matrix units. The first objective of the dissertation is to completely describe the form of all Jordan embeddings between two SMAs using concepts introduced by Coelho’s description of SMA automorphisms. Secondly, continuing the work of Molnar and Šemrl on rank-one preservers of the algebra of uppertriangular matrices , it considers several natural linear preserver problems on SMAs and puts them into the broader context of Jordan embeddings on SMAs. The third part of the dissertation contains a full extension of the well-known nonlinear preserver results of Petek and Šemrl (on and ) in the context of SMAs. More precisely, a characterization of SMAs is obtained with the property that all injective continuous commutativity and spectrum preserving map are necessarily Jordan embeddings.Jordanovi homomorfizmi između dviju asocijativnih algebri su linearna preslikavanja koja čuvaju kvadrate. U ovoj disertaciji se proučavaju Jordanovi homomorfizmi između strukturnih matričnih algebri (SMA), tj. unitalnih podalgebri od (algebre svih kompleksnih kvadratnih matrica reda ) razapetih nekim skupom matričnih jedinica. Prvi cilj disertacije je u potpunosti opisati formu svih Jordanovih ulaganja između dviju SMA koristeći koncepte uvedene u Coelhinom opisu automorfizama SMA. Nastavljajući rad Molnara i Šemrla na preserverima ranga jedan algebre gornjetrokutastih matrica , u drugom dijelu disertacije se promatra nekoliko prirodnih linearnih preservera na SMA i stavlja ih se u širi kontekst Jordanovih ulaganja na SMA. Treći dio disertacije sadrži potpuno proširenje dobro poznatog preserverskog rezultata Petek i Šemrla u kontekstu SMA. Preiznije, dobivena je karakterizacija SMA takvih da su sva injektivna neprekidna preslikavanja koja čuvaju komutativnost i spektar nužno Jordanova ulaganja
The effect of postbiotics on in vitro model of inflammatory bowel disease
No full textFermentirani čaj kombucha se konzumira tisućama godina i prepisuju mu se mnoga ljekovita
svojstva. Dosad je dokazano kako ima značajan antioksidacijski učinak i potencijalno pozitivno
djelovanje na mnoge bolesti od kojih su neke i upalne bolesti crijeva. S obzirom da za upalne
bolesti crijeva ne postoji terapija koja dovodi do izlječenja, istražuju se novi faktori uključeni u
patologiju bolesti kao što je oksidacijski stres i očuvanje epitelne barijere probavnog sustava.
Ovaj diplomski rad istražuje učinak postbiotika kombuche na ljudskom staničnom modelu kokulture staničnih linija Caco-2 i THP-1. Uspostavila sam model zdrave epitelne membrane i
model epitelne membrane u stanju upale te ih tretirala postbiotikom kombuche u različitim
testnim skupinama koje ispituju preventivni i terapijski učinak kombuche. Mjerenjem
transepitelnog otpora sam pokazala da kombucha jača integritet epitelne membrane crijeva.
Mjerenjem razine reaktivnih vrsta kisika nisam pokazala statistički značajan učinak na povećanje
niti smanjenje oksidacijskog stresa. Međutim, analizom ekspresije gena za enzime oksidacijskog
stresa pokazala sam da ih stanje upale blago pojačava i da tretman samo kombuchom izrazito
povećava ekspresiju katalaze (CAT) i superoksidne dismutaze 1 (SOD1). Rezultati istraživanja
upućuju na potencijalno bolji integritet crijevne barijere i veću spremnost obrane od
oksidacijskog stresa pri konzumaciji fermentiranog čaja kombuche.Fermented kombucha tea has been consumed for thousands of years and is thought to have
healing properties. It has been confirmed to have a significant antioxidative effect and potentially
positive effect on many diseases, among which is Inflammatory bowel disease (IBD). Current
IBD therapies do not offer a complete cure for the disease, so new targets such as oxidative stress
and gut-barrier disruption are being investigated. This master thesis focuses on the effect of
kombucha postbiotics on a human cell co-culture model using Caco-2 and THP-1 cell lines. I
established a healthy co-culture and an inflamed one and I treated them both with the postbiotic
in different test groups which investigate kombucha’s preventative and therapeutic potential. By
measuring the transepithelial electrical resistance (TEER), I showed that the postbiotic has an
influence on improving barrier integrity. Measurements of reactive oxygen species did not show
statistically significant decrease nor increase in oxidative stress. But gene expression analysis of
antioxidant enzymes showed that inflammation causes a slight increase in their expression and
that treatment with kombucha alone, causes a drastic increase in expression of catalase (CAT)
and superoxide dismutase 1 (SOD1). Overall, the findings suggest that consuming fermented
kombucha tea may improve the gut barrier integrity and enhance the body's defense against
oxidative stress
Checklist of leaf beetles (Insecta: Coleoptera: Chrysomelidae) and state of the knowledge on their fauna in Croatia
No full textDanašnje ubrzano smanjenje biološke raznolikosti svakoj zemlji nameće potrebu popisivanja
svoje flore i faune. U ovome radu je po prvi puta sustavno istraživana fauna raznolike i brojne
porodice kornjaša, zlatica (Chrysomelidae). Analizirane su tri povijesne muzejske zbirke, tri
recentne privatne zbirke te literatura kako bi se I) nadopunilo znanje o entomofauni, II) sastavio
prvi sistematski popis vrsta zlatica te III) utvrdila dosadašanja istraženost zlatica na području
Republike Hrvatske. Obrađene su tri zbirke Hrvatskog prirodoslovnog muzeja čiji su predmeti,
ovisno o stupnju prethodne obrađenosti, popisani i (re)determinirani. Svi povijesni podaci
usklađeni su s recentnim nazivljem, a lokaliteti su georeferencirani. Ukupno su zabilježene 602
vrste zlatica, od čega je 15 novih vrsta za faunu Hrvatske. Nalazi i njihova brojnost prikazani
su na karti razine 10 × 10 km kvadranata. Provedena je analiza faune prema biogeografskim
regijama koja je ukazala na najveći broj vrsta i nalaza za mediteransku regiju.Trenutno u više
od polovice hrvatskog teritorija nema niti jedan zabilježen nalaz zlatica. Stoga, buduća
istraživanja trebaju biti fokusirana upravo na te dijelove Hrvatske. Ovaj rad predstavlja
značajan doprinos znanju o entomofauni naše zemlje. Temelj je budućim istraživanjima faune
kornjaša za područje Republike Hrvatske, jer implementira i povijesne i recentne podatke.Nowadays accelerated decline of biodiversity is forcing every country to enlist its flora and
fauna. In this work, the fauna of a species-rich and numerous family of beetles, the leaf beetles
(Chrysomelidae), was systematically analysed for the first time. Three historical museum
collections, three recent private collections and literature were analysed in order to I) contribute
to the knowledge of entomofauna, II) compile the first systematic list and III) determine the
extent to which leaf beetles have been studied in the Republic of Croatia so far. Three
collections of the Croatian Natural History Museum were analysed, their objects listed and
(re)identified where necessary. All historical data were analysed and linked to the current
nomenclature, while the localities were georeferenced. A total of 602 species of leaf beetles
were recorded, 15 of which are new to the Croatian fauna. The records are presented on a 10 ×
10 km quadrangle map. An analysis of the fauna by biogeographical region was carried out,
which revealed the largest number of species and findings for the Mediterranean region.
Currently, not a single leaf beetle has been found in more than half of the Croatian territory.
Therefore, future research should focus precisely on those parts of Croatia. This work represents
an important contribution to the knowledge of the entomofauna of our country in general and
represents the basis for future studies of the beetle fauna as it includes both historical and current
data