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	<title>Znanstveni kutak | Prirodoslovna škola Karlovac</title>
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		<title>Jesenske boje u labaratoriju</title>
		<link>https://prirodoslovnaskola-ka.hr/jesenske-boje-u-labaratoriju/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Fri, 14 Nov 2025 16:45:10 +0000</pubDate>
				<category><![CDATA[Novosti]]></category>
		<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114998</guid>

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				<div class="et_pb_text_inner"><p style="font-weight: 400;">Koliko boja skriva list? Učenici 3.C razreda, smjera tehničar nutricionist otkrili su ih uz pomoć kromatografije, uz mentoricu prof. Maričić. Ako i vas zanimaju boje jeseni i što je kromatografija, pogledajte u našu galeriju.</p>
<p style="font-weight: 400;">Koliko je promatranje promjena boja lišća u jesen popularno govori i sam naziv aktivnosti ‘leaf peeping’. Izađite van i pogledajte sve te boje.</p></div>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/jesenske-boje-u-labaratoriju/">Jesenske boje u labaratoriju</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>ZRAK – VRLO BITAN!</title>
		<link>https://prirodoslovnaskola-ka.hr/zrak-vrlo-bitan/</link>
					<comments>https://prirodoslovnaskola-ka.hr/zrak-vrlo-bitan/#respond</comments>
		
		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Wed, 05 Nov 2025 13:19:06 +0000</pubDate>
				<category><![CDATA[Novosti]]></category>
		<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114976</guid>

					<description><![CDATA[]]></description>
										<content:encoded><![CDATA[<div class="et_pb_section et_pb_section_1 et_section_regular" >
				
				
				
				
				
				
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				<div class="et_pb_text_inner">Danas smo dokazali da zrak ima volumen i masu. Papirnatu maramicu smo stavili u manju čašu i naopako uronili u veću čašu do polovice napunjenu vodom.</p>
<p>Maramica je ostala suha pa smo dokazali prisutnost zraka. Tko ne vjeruje neka pogleda video.</p>
<p>U pokusu sa svijećom uočili smo da poklapanjem upaljene svijeće menzurom, dolazi do stvaranja vakuuma pa se zato svijeća podigne u vis. Naime, gorenjem svijeće dolazi do trošenja kisika u kemijskoj reakciji gorenja. (Malo kemije mora biti u svakom objašnjenju 😊).</p>
<p>U trećem pokusu dokazali smo da je zrak otopljen u vodi. Prilikom zagrijavanja vode došlo je do pojave mjehurića koji su išli ka površini epruvete, što dokazuje da zrak ima manju gustoću od vode.</p>
<p>U četvrtom pokusu imali smo vapnenu vodu i u nju smo slamkom upuhivali zrak. Kroz slamku je izlazio CO2, reagirao s vapnenom vodom zbog čega je nastao kalcijev karbonat koji je uzrokovao zamućenje vode. Tako lako!</p>
<p>Pokuse su proveli učenici 3.C razreda s mentoricom Monikom Maričić. Pokusi su preuzeti sa stranice PROFIL Klett.</p>
<p><img loading="lazy" decoding="async" class="alignnone size-large wp-image-114977" src="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/11/Picture1-1024x666.png" alt="" width="1024" height="666" srcset="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/11/Picture1-980x637.png 980w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/11/Picture1-480x312.png 480w" sizes="(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw" /></p>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/zrak-vrlo-bitan/">ZRAK – VRLO BITAN!</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>Tofu, tempeh, seitan</title>
		<link>https://prirodoslovnaskola-ka.hr/tofu-tempeh-seitan/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Wed, 19 Mar 2025 17:09:16 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114562</guid>

					<description><![CDATA[<p>Tofu, tempeh, seitan. Namirnice koje su česte u veganskoj prehrani, no puno ljudi za njih nikada nije ni čulo. U sklopu Praktične nastave, tehničari nutricionisti su se okušali u proizvodnji seitana. Podrijetlom iz Kine, seitan je jelo od punog pšeničnog zrna, bogato bjelančevinama. Kako je 4.c proizveo seitan pogledajte na slikama, a ako se i [&#8230;]</p>
<p>The post <a href="https://prirodoslovnaskola-ka.hr/tofu-tempeh-seitan/">Tofu, tempeh, seitan</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></description>
										<content:encoded><![CDATA[<p>Tofu, tempeh, seitan. Namirnice koje su česte u veganskoj prehrani, no puno ljudi za njih nikada nije ni čulo. U sklopu Praktične nastave, tehničari nutricionisti su se okušali u proizvodnji seitana. Podrijetlom iz Kine, seitan je jelo od punog pšeničnog zrna, bogato bjelančevinama. Kako je 4.c proizveo seitan pogledajte na slikama, a ako se i vi želite okušati u izradi recept pronađite u tekstu niže.</p>
<p>Recept: Za dobivanjem jednog manjeg komada seitana zamijesite glatko, mekano tijesto od 100g brašna i 100g vode. Započnite proces ispiranja tijesta kako bi odstranili škrob, a zadržali gluten. Dobiveno tijesto lagano okrećite rukama u vodi kako bi zadržalo oblik kugle. Kada voda postane bijela, zamijenite ju čistom mlakom vodom te nastavite s ispiranjem. Proces nastavite sve dok voda ne postane bistra. Dobivenu gumastu masu, oblikujte u kuglu te ostavite u hladnoj vodi na 10 minuta. Tijesto izvadite iz vode, stavite u gazu i zavežite. Stavite ga u lonac s vodom, dodajte željene začine i sol ili soja sos te kuhajte oko jedan sat. Seitan ostavite da se hladi u vodi u kojoj se kuhao. Potom ga izvadite iz gaze te stavite na mrežicu da se ocijedi i konzumirajte.</p><p>The post <a href="https://prirodoslovnaskola-ka.hr/tofu-tempeh-seitan/">Tofu, tempeh, seitan</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>Med</title>
		<link>https://prirodoslovnaskola-ka.hr/med/</link>
					<comments>https://prirodoslovnaskola-ka.hr/med/#respond</comments>
		
		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Wed, 19 Mar 2025 17:07:20 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114558</guid>

					<description><![CDATA[<p>Med je namirnica poznata po svojim mnogobrojnim ljekovitim svojstvima. Bogat je antioksidansima koji pomažu u smanjenju stresa i zaštiti tijela, zbog prisutnosti vitamina, minerala i enzima pomaže u jačanju imunološkog sustava. U kombinaciji s toplim napitcima ublažuje kašalj i grlobolju. Učenici 2.a razreda u sklopu vježbi Prehrane i poznavanje robe pokušali su dobiti umjetni med. [&#8230;]</p>
<p>The post <a href="https://prirodoslovnaskola-ka.hr/med/">Med</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></description>
										<content:encoded><![CDATA[<p>Med je namirnica poznata po svojim mnogobrojnim ljekovitim svojstvima. Bogat je antioksidansima koji pomažu u smanjenju stresa i zaštiti tijela, zbog prisutnosti vitamina, minerala i enzima pomaže u jačanju imunološkog sustava. U kombinaciji s toplim napitcima ublažuje kašalj i grlobolju.<br />
Učenici 2.a razreda u sklopu vježbi Prehrane i poznavanje robe pokušali su dobiti umjetni med. Dobiva se ukuhavanjem šećera uz dodatak limunske kiseline i po želji drugih aditiva. Kako izgleda umjetni med, pogledajte na videu.</p>
<div style="width: 1080px;" class="wp-video"><video class="wp-video-shortcode" id="video-114558-1" width="1080" height="1920" preload="metadata" controls="controls"><source type="video/mp4" src="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/03/YouCut_20250319_075937038.mp4?_=1" /><a href="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/03/YouCut_20250319_075937038.mp4">https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/03/YouCut_20250319_075937038.mp4</a></video></div><p>The post <a href="https://prirodoslovnaskola-ka.hr/med/">Med</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>Duga u Labosu</title>
		<link>https://prirodoslovnaskola-ka.hr/duga-u-labosu/</link>
					<comments>https://prirodoslovnaskola-ka.hr/duga-u-labosu/#respond</comments>
		
		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Thu, 20 Feb 2025 18:14:28 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114462</guid>

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				<div class="et_pb_text_inner">Nedostaje vam malo duginih boja? Učenici 2.c razreda, smjera tehničar nutricionist, stvaraju svoju dugu u menzuri. Zaključak: kemija može biti zabavna. STEM znanosti su zakon.<br />
Mentor: prof.Maričić</div>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/duga-u-labosu/">Duga u Labosu</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>Kristali</title>
		<link>https://prirodoslovnaskola-ka.hr/kristali/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Fri, 17 Jan 2025 17:04:52 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114390</guid>

					<description><![CDATA[<p>Kako nastaju pahuljice te kako izgledaju dijamanti kada su nebrušeni? Odgovore na ta pitanja za vas su pronašle Gabrijela i Ilijana u svojim prezentacijama. Kristale soli možemo napraviti i kod kuće, a kristale sumpora u labosu uz mentorstvo prof. Maričić. Zavirite u galeriju te dajte svoj prijedlog za kristale. Prezentacija: KRISTALI, KRISTALI 1</p>
<p>The post <a href="https://prirodoslovnaskola-ka.hr/kristali/">Kristali</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></description>
										<content:encoded><![CDATA[<p>Kako nastaju pahuljice te kako izgledaju dijamanti kada su nebrušeni? Odgovore na ta pitanja za vas su pronašle Gabrijela i Ilijana u svojim prezentacijama. Kristale soli možemo napraviti i kod kuće, a kristale sumpora u labosu uz mentorstvo prof. Maričić. Zavirite u galeriju te dajte svoj prijedlog za kristale.</p>
<p>Prezentacija: <a href="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/01/KRISTALI.pptx">KRISTALI</a>, <a href="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2025/01/KRISTALI-1.pptx">KRISTALI 1</a></p>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/kristali/">Kristali</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>Mole day &#8211; Dan mola</title>
		<link>https://prirodoslovnaskola-ka.hr/mole-day-dan-mola/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Wed, 23 Oct 2024 13:27:24 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114239</guid>

					<description><![CDATA[<p>Koliko molekula vode popijemo u 2 dL vode? Odgovor na to pitanje dale su nam učenice 1.c razreda s nastavnicom kemije Sandrom Humić. Svake godine 23. listopada od 6:02 do 18:02, Dan mola obilježava Avogadrov broj (6,02 x 10²³) koji je osnovna mjerna jedinica u kemiji. Dan mola osmišljen je kao način poticanja interesa za kemiju, [&#8230;]</p>
<p>The post <a href="https://prirodoslovnaskola-ka.hr/mole-day-dan-mola/">Mole day – Dan mola</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></description>
										<content:encoded><![CDATA[<p>Koliko molekula vode popijemo u 2 dL vode? Odgovor na to pitanje dale su nam učenice 1.c razreda s nastavnicom kemije Sandrom Humić.<br />
Svake godine 23. listopada od 6:02 do 18:02, Dan mola obilježava Avogadrov broj (6,02 x 10²³) koji je osnovna mjerna jedinica u kemiji. Dan mola osmišljen je kao način poticanja interesa za kemiju, a nadamo se da su učenice 1.c uspjele u tome.</p>
<p><img loading="lazy" decoding="async" class="alignnone size-large wp-image-114242" src="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-3.-Koliko-molekula-vode-popijemo-472x1024.jpeg" alt="" width="472" height="1024" /></p>
<p><img loading="lazy" decoding="async" class="alignnone size-large wp-image-114241" src="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-1024x768.jpeg" alt="" width="1024" height="768" srcset="https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-1024x768.jpeg 1024w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-300x225.jpeg 300w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-768x576.jpeg 768w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-1536x1152.jpeg 1536w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-510x382.jpeg 510w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-1080x810.jpeg 1080w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-1280x960.jpeg 1280w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-980x735.jpeg 980w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza-480x360.jpeg 480w, https://prirodoslovnaskola-ka.hr/wp-content/uploads/2024/10/Slika-2.-1-mol-sumpora-kuhinjske-soli-i-željeza.jpeg 2000w" sizes="(max-width: 1024px) 100vw, 1024px" /></p><p>The post <a href="https://prirodoslovnaskola-ka.hr/mole-day-dan-mola/">Mole day – Dan mola</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>MALI, ALI MOĆNI &#8211; KVASCI</title>
		<link>https://prirodoslovnaskola-ka.hr/mali-ali-mocni-kvasci/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Fri, 18 Oct 2024 13:52:39 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114232</guid>

					<description><![CDATA[<p>Kvasci su ovalna/kuglasta jednostanična gljivica, nevidljiva golim okom. Najčešći i najpoznatiji oblici kvasca su pekarski i pivski kvasac. Kvasci igraju ključnu ulogu u rastu kruha. Fermentiraju škrob iz brašna prilikom čega proizvode CO2 i alkohol etanol. CO2  uzrokuje dizanje i prozračnost kruha, a alkohol ispari pri visokim temperaturama dajući kruhu posebnu aromu. Jednadžba alkoholne fermentacije [&#8230;]</p>
<p>The post <a href="https://prirodoslovnaskola-ka.hr/mali-ali-mocni-kvasci/">MALI, ALI MOĆNI – KVASCI</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></description>
										<content:encoded><![CDATA[<p>Kvasci su ovalna/kuglasta jednostanična gljivica, nevidljiva golim okom. Najčešći i najpoznatiji oblici kvasca su pekarski i pivski kvasac.</p>
<p>Kvasci igraju ključnu ulogu u rastu kruha. Fermentiraju škrob iz brašna prilikom čega proizvode CO2 i alkohol etanol.</p>
<p>CO2  uzrokuje dizanje i prozračnost kruha, a alkohol ispari pri visokim temperaturama dajući kruhu posebnu aromu.</p>
<p>Jednadžba alkoholne fermentacije je:</p>
<p>C6H12O6 à 2CO2 + 2CH3CH2OH</p>
<p>&nbsp;</p>
<p>Na slikama je prikazan pokus koji je 4.c razred izveo u sklopu vježbi iz predmeta mikrobiologija namirnica, uz nastavnicu Maju Macut.</p>
<p>Učenici su u tikvice dodali vodu, šećer i kvasac te tikvice izložili različitim uvjetima. Jedna skupina je imala različit pH, druga skupina različite temperature vode, a treća skupina različite količine šećera. Na slikama možemo vidjeti koji uvjeti najbolje odgovaraju kvascima za rast.</p>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/mali-ali-mocni-kvasci/">MALI, ALI MOĆNI – KVASCI</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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		<title>PRAVILA PONAŠANJA U LABORATORIJU</title>
		<link>https://prirodoslovnaskola-ka.hr/pravila-ponasanja-u-laboratoriju/</link>
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Tue, 15 Oct 2024 12:17:43 +0000</pubDate>
				<category><![CDATA[Znanstveni kutak]]></category>
		<guid isPermaLink="false">https://prirodoslovnaskola-ka.hr/?p=114193</guid>

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				<div class="et_pb_text_inner">Kako se treba ponašati u laboratoriju?</p>
<p>Na koji način izbjeći moguću nesreću u laboratoriju?</p>
<p>S čim se sve možete susresti u laboratoriju?</p>
<p>&nbsp;</p>
<p>To su samo neka pitanja o kojima možete razmisliti prije ulaska u laboratorij, a odgovor su nam dali učenici 3.c razreda.</p>
<p>Video 1 &#8211; Antonija Bukovšćak, Karlo Klobučar i Nika Vinski</p>
<p>Video 2 &#8211; Luka Marković, Sven Odak i Sergej Kunić</div>
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			</div><p>The post <a href="https://prirodoslovnaskola-ka.hr/pravila-ponasanja-u-laboratoriju/">PRAVILA PONAŠANJA U LABORATORIJU</a> first appeared on <a href="https://prirodoslovnaskola-ka.hr">Prirodoslovna škola Karlovac</a>.</p>]]></content:encoded>
					
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