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Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation defines a prequalification process as a process to verify the compliance of a reserve providing unit or a reserve providing group with the requirements set by the transmission system operator. Croatian Transmission System Operator Plc. (HOPS) carries out a prequalification process in order for (potential) ancillary service providers to prove their capability of providing ancillary services, which means that the prequalification process is a prerequisite for the provision of ancillary services. As part of the European Network of Transmission System Operators for Electricity, HOPS participates in the European implementation projects PICASSO and MARI, which aim is to establish a single European platform for aFRR and mFRR balancing services. Within the PICASSO and MARI projects, the technical characteristics of the products traded on unique European platforms were defined. This paper analyzes the difference between the requirements from the existing prequalification process rules and the technical requirements for products within the PICASSO and MARI projects, explores practice in Slovenia and Germany and suggests the required adoptions of aFRR and mFRR prequalification process in Croatia.

Defolijacija je jedan od zahvata zelene rezidbe tijekom kojeg se vrši prorjeđivanje ili potpuno uklanjanje lisne mase u zoni grožđa. Ako se djelomična defolijacija provodi u fenofazi cvatnje vinove loze smatra se ranom dok se defolijacija u fenofazi šare smatra kasnom defolijacijom. Cilj ovog istraživanja je utvrditi utjecaj djelomične defolijacije provedene u različitim fenofazama (jedna varijanta predstavlja bazalnu defolijaciju u fenofazi zametanja boba, druga bazalnu početkom šare, a treća defolijaciju iznad zone grozda, također početkom šare) na kemijski sastav grožđa sorte Graševina u podregiji Slavonija., Defoliation is one of the green pruning interventions in which thinning or complete removal of leaves in the grape zone is performed. If partial defoliation is carried out in the grapevine during the flowering phase, it is considered an early defoliation, while defoliation in the pattern phase is considered to be a late defoliation. The aim of this study was to investigate the influence of partial defoliation performed in three different variants (one variant represents basal defoliation in grape berries flowering phenophase, the second variant basal defoliation at the beginning of the verison, and the third variant represents defoliation above the cluster zone, also at the beginning of the verison) on the chemical composition of Graševina variety in Slavonia.

Fenolni spojevi predstavljaju sekundarne biljne metabolite koji imaju vrlo važnu fiziološku i morfološku ulogu u rastu i reprodukciji biljke pružajući joj i zaštitu protiv patogena i predatora. Cilj ovoga istraživanja je dobiti pregled promjena u sastavu i sadržaju fenolnih spojeva odnosno flavonola, flavanola, hidroksicimetnih i hidroksibenzojevih kiselina prisutnih u listovima četiri različite crne sorte vinove loze. Ekstrakti su analizirani tekućinskom kromatografijom visoke djelotvornosti. Dobivenim rezultatima utvrđena je značajna varijabilnost u masenim udjelima fenolnih spojeva između sorata po pojedinim terminima uzorkovanja, kao i značajna varijabilnost u sadržaju fenolnih spojeva unutar iste sorte tijekom različitih termina uzorkovanja., Phenolic compounds represent secondary plant metabolites which play an important physiological and morphological role in plant growth and reproduction. They also provide a protection against pathogens and predators. The aim of this study is to obtain an overview of changes in the composition and phenolic compounds content, more precisely flavonols, flavanols, hydroxycimetic and hydroxybenzoic acids present in the leaves of four different grapevine varieties. The extracts were analyzed by high performance liquid chromatography. Based on the obtained results, significant variability in mass shares of phenolic compounds between varieties was determined by individual sampling terms, as well as significant variability in the content of phenolic compounds within the same variety during different sampling terms.

Grapevine is an important plant species known worldwide, counting more than 10,000 cultivars of Vitis vinifera spread all over the world. There is a strong need for long-term conservation of grapevine genetic resources. With so polymorphic species, it is highly difficult to obtain relevant results considering that cryopreservation protocols were established testing only few very often specific cultivars. Regarding cryopreservation protocols, many factors are influencing the final result. Research articles processing cryopreservation protocols of grapevine are reporting a percentage of recovery, but a broader application of some protocol on a large range of Vitis vinifera cultivars is limited. How to design an efficient cryopreservation protocol, starting from plant material to the appropriate observation of recovery, will be discussed in this chapter.

Grapevine is an important plant species known worldwide, counting more than 10,000 cultivars of Vitis vinifera spread all over the world. There is a strong need for long-term conservation of grapevine genetic resources. With so polymorphic species, it is highly difficult to obtain relevant results considering that cryopreservation protocols were established testing only few very often specific cultivars. Regarding cryopreservation protocols, many factors are influencing the final result. Research articles processing cryopreservation protocols of grapevine are reporting a percentage of recovery, but a broader application of some protocol on a large range of Vitis vinifera cultivars is limited. How to design an efficient cryopreservation protocol, starting from plant material to the appropriate observation of recovery, will be discussed in this chapter.