Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6

We report the revised crystal structure, static and dynamic magnetic properties of quasi-two dimensional honeycomb-lattice silver delafossite Ag3Co2SbO6. The magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long range order at low temperatures with N\'eel temperature TN ~ 21.2 K. In addition, the magnetization curves revealed a field-induced (spin-flop type) transition below TN in moderate magnetic fields. The GGA+U calculations show the importance of the orbital degrees of freedom, which maintain a hierarchy of exchange interaction in the system. The strongest antiferromagnetic exchange coupling was found in the shortest Co-Co pairs and is due to direct and superexchange interactions between the half-filled xz+yz orbitals pointing directly to each other. The other four out of six nearest neighbor exchanges within the cobalt hexagon are suppressed, since for these bonds active half-filled orbitals turned out to be parallel and do not overlap. The electron spin resonance (ESR) spectra reveal a Gaussian shape line attributed to Co2+ ion in octahedral coordination with average effective g-factor g=2.3+/-0.1 at room temperature and shows strong divergence of ESR parameters below 120 K, which imply an extended region of short-range correlations. Based on the results of magnetic and thermodynamic studies in applied fields, we propose the magnetic phase diagram for the new honeycomb-lattice delafossite

Formation of an integrated financial regulation system of transport corporations’ economic development

Scientific findings of this article correspond with the fact that the development of interacting business entities is quite diverse. This affects the efficiency of corporations’ budget management. So, a need arises to adjust the financial assets applied to the development of integrated enterprises, basing on their economic compatibility evaluation. Authors suggest using the companies’ development intensity determined by the increasing qualitative business activity indicators compared to the increasing quantitative ones. Theoretical economics gives no clear definition of compatibility of developing companies. Economic practices do not pay proper attention to the development of effective financial regulation of economic development of companies integrated into a corporation. The article suggests original definitions of economic compatibility as well as the model of forming the integrated system of transport companies’ economic development on the basis of morphological approach. Theoretical and methodological findings are approved in the business activity of transport corporationspeer-reviewe

Importance of thermometry in monitoring of the flaps

Department of Orthopaedics and Traumatology, Nicolae Testemitanu State University of Medicine and Pharmacy, Chisinau, Republic of Moldova, The 6th International Medical Congress for Students and Young Doctors, May 12-14, 2016Introduction: Complications highlighted in the postoperative period remains to be one of the current problems of reconstructive surgery, which has a relatively increased incidence (5-17%). Aim: evaluation of diagnostic value of local thermometry of flaps for early detection of complications. Material and methods: The study group was 36 patients treated in the period 2014-2015 within the IEM, women - 10 (27.8%), men - 26 (72.2%). The limits of age were 16-70 years, with mean age 44.7 years. The thermometry was performed with an electronic thermometer with an accuracy of 0.1 0C and the data were recorded in the form of thermal curves. The temperature of the receiving areas were considered baseline values that were compared to the thermometric values of the flaps. Duration of monitoring was from 1 postoperative day to 1 year, at 2-3 months range. Data were statistically analyzed using the "step by step regression" with truthful coefficients. Results: In the study group were 30(83.3%) island flaps, free – 6 (16.7%) cases. Thermometric differences in the postoperative period ZR/ZD >20C were found in 6 (16.7%) cases: island flaps – 4 (13.3%) cases, free – 2 (33.3%) cases. If the island complications occurred in 8( 26.7%) cases, free – two (33.3%) cases. Free flap complications: venous insufficiency due to anastomosis’s thrombosis (n=1), marginal necrosis (n=1) and insufficiency of anastomosis due to adjacent tissue’s edema (n=1). Complications of island flaps were: marginal necrosis (n=4), vascular insufficiency due to edema (n=3) and loss of the flap (n=1). Conclusions: In the early postoperative period thermometric difference >20C indicates a flap’s vascular suffering that requires urgent actions. In the case of island flaps the thermometry has a sensitivity of approximately 85%, while in the case of free - 95%, the specificity is 98% in both

The first rays joint fractures and treatment modalities

Catedra de ortopedie și traumatologie, USMF „Nicolae Testemițanu”, Clinica de chirurgie plastică și microchirurgie reconstructivă a locomotorului, IMSP IMU, Chișinău, Republica Moldova, Conferința stiințifică „Nicolae Anestiadi – nume etern al chirurgiei basarabene” consacrată centenarului de la nașterea profesorului Nicolae Anestiadi 26 august 2016Introducere. Incidenţa crescută a traumatismelor mâinii ocupa primul loc in traumatismele corpului uman. Aceasta stimulează în permanenţă ingeniozitatea chirurgilor în a găsi noi metode reconstructive tot mai performante. Deși, ei se confruntă pe de o parte, cu anatomia complexă a mâinii, iar pe de altă parte cu obligativitatea de a păstra integritatea sistemului nervos, vascular şi tendinos totuși, este reala posibilitatea unei reconstrucţii complexe cu ţesuturi similare fără a crea defecte secundare importante.Scopul. Eșalonarea incidenței lezionale a policelui în complexul de traumatisme ale mâinii si separarea itimilor depistați în funcție de suprafață și pe nivele razei digitale. Material si metode. În lucrare am inclus un lot de 460 de pacienți pe perioada anului 2015. Limitele de vârsta au fost între 19-70 ani, divizați pe categorii a câte 10 ani. Repartizarea pe sexe dintre cei 79 de pacienți cu traumatisme a policelui a constituit: 69 (87.34%) bărbați si 10 (12.66%) femei. Frecvența traumatismelor înregistrate la membrul stâng 40 (50.34%) a fost mai mare decât la membrul drept 39 (49.67%). 79 (17.17%) pacienți din lotul total au suferit traumatisme ale policelui, dintre care: separat al policelui 46 (58.22%) și în complex cu alte degete 33 (41.78%). În traumatismele policelui pe segmente au fost incluși pacienții tratați in staționar. Falanga proximală s-a dovedit a fi cel mai des traumată 39 (49.36%) de cazuri, apoi urmează falanga distală 37 (46.83%) de cazuri și doar în 3 (3.79%) cazuri au avut de suferit ambele falange. Rezultate. Incidența traumatismului policelui separat se întâlnesc la 46(58.22%) de pacienți și in complex cu alte degete la 33 (41.78%) de pacienți. Ceia ce constituie din ansamblu de traumatisme ale mâinii 17.17%. Prelucrarea materialului obținut denota prevalenta incidentei pentru falanga distală a policelui dar nu si ca gravitate care se manifesta mai accentuat pe măsura avansării spre baza lui. Aceasta a dictat managementul tratamentului si complexitatea intervențiilor chirurgicale efectuate. Concluzie. Leziunile policelui in complexul traumatismelor mâinii se întâlnesc mai des ca fiind un traumatism separat decât in asociere cu celelalte degete ale mâinii, prevalând la bărbați, iar membrul superior stâng fiind afectat intr-o incidenta ușor mai sporită.Introduction. The increased incidence of hand trauma injuries ranks first in the human body. This continually stimulates surgeons ingenuity to find new performant ways in reconstructive methods. Although, they are facing, on the one hand, with complex hand’s anatomy complex and, on the other hand, with the obligation to preserve the integrity of the nervous, vascular and tendon system, however, it is real the possibility of a complex reconstruction with similar tissues without creating significant defects. Purpose. Distribution of thumb’s lesional incidence in hand’s trauma complex and items separation detected depending on the surface and levels of digital beam. Material and methods. In this paper we included a group of 460 patients treated during the 2015 year. The age limits were between 19-70 years, divided into categories of 10 years. The sex ratio of the 79 patients with thumb injury was: 69 (87.34%) men and 10 (12.66%) women. Frequency of trauma registered in left member - 40 (50.34%), was higher than in the right one - 39 (49.67%). 79 (17.17%) patients from total group have suffered thumb’s trauma, including: separate thumb - 46 (58.22%) and in complex with other fingers - 33 (41.78%). In thumb’s trauma, according to segments, were included patients treated in hospital. Proximal phalanx was found to be most traumatized - 39 (49.36%) cases, followed by the distal phalanx - 37 (46.83%) cases and only in 3 (3.79%) cases have suffered both phalanges. Results. Incidents of separate thumb’s trauma are met at 46 (58.22%) patients and in complex with other fingers in 33 (41.78%) patients, which constitutes in the ensemble of hand’s trauma 17.17%. Processing of obtained material denotes prevalence of incidence of thumb’s distal phalanx, but not the severity that manifests more pronounced as it progresses toward its base. This dictated the treatment’s management and complexity of performed surgery. Conclusion. Thumb’s injuries in complex of hand’s trauma are more often met as a separate trauma than in association with other fingers of the hand, with prevalence in men, and left upper limb is affected with a slightly increased incidence

Thermometry need in monitoring flaps

Catedra de ortopedie și traumatologie, USMF „Nicolae Testemițanu”, Clinica de chirurgie plastică și microchirurgie reconstructivă a locomotorului, IMSP IMU, Chișinău, Republica Moldova, Conferința stiințifică „Nicolae Anestiadi – nume etern al chirurgiei basarabene” consacrată centenarului de la nașterea profesorului Nicolae Anestiadi 26 august 2016Introducere. Complicațiile evidențiate în perioada post-operatorie rămân a fi una din problemele actuale ale chirurgiei reconstructive, acestea având o incidență relativ mărită (5-17%). Scopul. Evaluarea valorii diagnostice a termometriei locale a lambourilor în depistarea precoce a complicațiilor. Material și metode. Lotul de studiu a constituit 36 de pacienți, tratați în perioada 2014-2115 în cadrul IMU,repartizarea fiind: femei - 10 (27,8%), bărbați - 26 (72,2%). Limitele de vârstă - 16-70 ani, vârsta medie fiind de 44,7 ani. Termometria s-a efectuat cu un termometru electronic cu precizie de 0,1 0C, datele fiind înregistrate sub forma de curbe termice. Valorile termice ale zonelor receptoare au fost considerate valori de referință cu care s-au comparat valorile termice ale lambourilor. Durata de monitorizare: din 1 zi postoperator până la 1 an, cu interval de 2-3 luni. Datele obținute au fost prelucrate statistic prin metoda “regresiei pas cu pas” cu coeficienți veridici. Rezultate. În lotul de studiu au fost lambouri insulare 30 (83,3%) cazuri, libere – 6 (16,7%) cazuri. În perioada postoperatorie diferențele termometrice ZR/ZD > 2 0C au fost evidențiate în 6 (16,7%) cazuri: lambouri insulare – 4 (13,3%) cazuri, libere – 2 (33,3%) cazuri). În cazul celor insulare complicații au survenit în 8 (26,7%) cazuri, în libere - 2 (33,3%) cazuri. Concluzii. În perioada postoperatorie precoce diferența termometrică >20C indică asupra unei suferințe vasculare a lamboului necesitând măsuri urgente de resuscitare. În cazul lambourilor insulare termometria posedă o sensibilitate de aproximativ 85%, iar în cazul celor libere - 95 %, specificitatea fiind de 98% în ambele tipuri.Introduction. Complications highlighted in the postoperative period remains to be one of the current problems of reconstructive surgery, which has a relatively increased incidence (5-17%). Purpose. Evaluation of diagnostic value of local thermometry of flaps for early detection of complications. Material and methods. The study group was 36 patients treated in the period 2014-2115 within the IEM, women - 10 (27.8%), men - 26 (72.2%). The limits of age were 16-70 years, with mean age 44.7 years. The thermometry was performed with an electronic thermometer with an accuracy of 0.1 0C and the data were recorded in the form of thermal curves. The temperature of the receiving areas was considered baseline values that were compared to the thermometric values of the flaps. Duration of monitoring was from 1 postoperative day to 1 year, at 2-3 months range. Data were statistically analyzed using the "step by step regression" with truthful coefficients. Results. In the study group were 30(83.3%) island flaps, free - 6(16.7%) cases. Thermometric differences in the postoperative period ZR / ZD> 20C were found in 6(16.7%) cases: island flaps - 4(13.3%) cases, free - 2(33.3%) cases). If the island complications occurred in 8(26.7%) cases, free - two(33.3%) cases. Conclusions. In the early postoperative period thermometric difference > 20C indicates a flap’s vascular suffering that requires urgent actions. In the case of island flaps the thermometry has a sensitivity of approximately 85%, while in the case of free - 95%, the specificity is 98% in both

The elements of pathology and physiology of microsurgical flaps

Clinica de Chirurgie Plastică și Microchirurgie Reconstructivă, USMF “Nicolae Testemițanu”, Chișinău, Republica Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Transferul microchirurgical la prima vedere, pe lîngă cursul de dezvoltare extrem de rapid al nanomedicinei, s-ar părea că rezolvă livrarea țesuturilor pentru plastia și reconstrucția zonelor afectate ale corpului uman. În realitate, direcția acestui vector nu este suficient elucidată și la moment rămîn a fi discutate semnele de întrebare, care apar pe marginea acestui subiect. Scopul: Interpretarea corectă a concepțiilor modificărilor care au loc în lambou, în baza cărora ulterior vom putea stabili un algoritm de supraveghere și de tratament bine elucidat și funcționabil. Material și metode: Au fost studiate 112 surse de specialitate care reflectă starea țesuturilor umane în anumite situații critice, inclusiv în lambouri. Rezultate: Chirurgia lambourilor este însoțită de trauma chirurgicală, iar transferul de țesuturi este urmat de leziuni ischemice de reperfuzie, ceea ce poate compromite tot rezultatul intervenției. Este acceptat faptul că leziunea de reperfuzie este un proces inflamator modulat de mecanisme complexe de semnalizare, care în cele din urmă duce la moartea celulară și afectarea lamboului. Restabilirea fluxului sanguin este esențială pentru supraviețuirea lamboului, cu toate acestea, paradoxul este că reperfuzia produce un prejudiciu ischemic prin numeroase căi inflamatorii. Concluzie: Blocajul acut al fluxului sanguin, fără depistarea de curînd și tratarea activă, poate urma cu acțiune sistemică sub forma insuficienței poliorganice și moarte.Introduction: The microsurgical transfer, besides the extremely rapid development of nanomedicine, seems that solves and offers solutions pertaining to the supply of tissues for the plasty and reconstruction of affected areas of the human body. In fact, the direction of this vector isn’t fully elucidated and at this moment remains to be discussed the questions which appear on this subject. Purpose: Correct interpretation of the concept of changes which take place in the flap, on the basis of which, later we’ll be able to establish a well understood and functional algorithm of monitoring and treatment. Material and methods: It has been studied 112 specialized literature sources that reflect the state of human tissues in some critical situations, including flaps. Results: Flap’s surgery is accompanied buy surgical trauma, and transfer of human tissues is followed by ischemic lesions of reperfusion, which can compromise the whole outcome of the interventions. It is recognized that the lesions of reperfusion is an inflammatory process, modulated by complex signaling mechanisms which eventually leads to cell death and flap’s damage. Restoring blood flow is essential for the flap’s survival; however, the paradox is that reperfusion produces an ischemic injury through numerous inflammatory pathways. Conclusions: Acute blockage of blood flow, without early detection and active treatment, soon is followed by systemic action in the form of polyorganic insufficiency and death

Cross-leg technique in the treatment of tibial bone defects

Clinica de Chirurgie Plastică şi Microchirurgie Reconstructivă, USMF “Nicolae Testemițanu”, Chişinău, Republica Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: În situații deosebite, unde vasele membrului traumatizat au suportat leziuni importante şi nu pot fi utilizate ca sursă receptoare, se foloseşte metoda de plastie a defectelor „împrumutînd” temporar surse donatoare de pe membrele alăturate. Scopul: Identificarea aspectelor esențiale în literatura de specialitate şi în baza studiului propriu, ceea ce vizează ulterior transferul de lambou fibular osteocutanat prin metoda “cross-leg”. Material și metode: Transferul de fibulă vascularizată prin metoda “cross-leg” a fost efectuată la 4 pacienți – bărbați, cu un defect osos tibial cuprins între 10 şi 24 cm. Metoda cuprinde 2 etape. Timpul I a presupus o incizie verticală pe partea anterolaterală a gambei şi două incizii transversal-paralele pînă la adîncul fasciei profunde. Lamboul fiind ridicat în plan subfascial, incizia a fost continuată pînă la fibulă cu secționarea ulterioară în proximal şi distal. Inciziile transversale sînt continuate în plan subfascial pînă la limita postero-medială a tibiei, păstrîndu-se septul crural posterior şi integritatea perforantelor. Ambele gambe sînt fixate în aparat extern pe un termen de aproximativ 21 de zile. Timpul II presupune disecția lamboului de la locul donator, iar defectul donator este grefat. Rezultate: Indicații pentru procedeul dat sunt leziunile grave vasculare la membrul afectat, care nu permit un transfer liber sau un procedeu microchirurgical. Concluzii: Lamboul fibular osteofasciocutanat este un lambou sigur pentru acoperirea defectelor osoase şi tisulare, doar în concordanță strictă cu stabilirea indicațiilor şi contraindicațiilor către acest procedeu.Introduction: In special situations, where vessels of injured limb suffered severe lesions and can’t be used as recipient source, it uses method of defect’s plasty ”borrowing” temporary donor sources from adjacent limbs. Purpose: Identification of essential theoretical and practical issues in literature and based on own experience, which aims further transfer of fibular osteo-cutaneous flap using cross-leg method. Material and methods: The vascularized fibula transfer using “cross leg” method in treatment of tibial bone defects was performed in 4 men, with tibial bone defect between 10 and 24 cm. The method consists in performing a 2 stage surgery. Initially, first stage assumed a vertical incision on the antero-lateral side of the lower leg and 2 transverse parallel incisions to depth of deep fascia. Raising flap in a subfascial plan, incision was continued until the fibula with its subsequent proximal and distal sectioning. Transverse incisions were continued in subfascial plan until the postero-medial limit of the tibia, preserving posterior crural septum and integrity of perforator vessels. Both legs were attached to an external device for a period of approximately 21 days. Later, the second stage assumed the flap’s dissection from the donor area, and the grafting of the defect. Results: Respecting the method’s principle is possible to treat bone defects when an usual microsurgical technique is not feasible due to severe concomitant ipsilateral vascular lesions. Conclusions: The fascio-osteo-cutaneous fibular flap is a safe flap for coverage of bone and tissues defects, only in accordance with strict preset of indications and contraindications of the procedure

Planning flaps in the calf according to availability physiology

Catedra de ortopedie și traumatologie, USMF „Nicolae Testemițanu”, Clinica de chirurgie plastică și microchirurgie reconstructivă a locomotorului, IMSP IMU, Chișinău, Republica Moldova, Conferința stiințifică „Nicolae Anestiadi – nume etern al chirurgiei basarabene” consacrată centenarului de la nașterea profesorului Nicolae Anestiadi 26 august 2016Introducere. Acest studiu a fost efectuat pentru a determina lățimea optima disponibila a zonei donatoare de lambou care nu va prejudicia închiderea primara a plăgii donore, fiind suturata primar plan cu plan.Scop. Evaluarea disponibilității tegumentare fiziologice a fiecărei regiuni donatoare de la nivelul gambei. Material și metode. Studiul a fost efectuat pe un lot de 30 de voluntari, pe membrele sănătoase. Limitele de vârsta in lot au fost de 20 - 60 de ani, divizate pe categorii a câte 10 ani, fiecare subcategorie incluzând minim 5 voluntari. Disponibilitatea fiziologica s-a calculat pentru lambourile: safen, sural, peronier superficial, suprameleolar, fibular, tibial posterior si tibial anterior. Tegumentul s-a plicaturat in centrul teritoriului donator (cetripet), pana când părtile plicaturate contactau formând duplicatura (Ld). Grosimea duplicaturii s-a măsurat, fiind trecuta pe linia milimetrica. Ulterior, plica cutanata era desfăcuta la parametrii normali ai tegumentului cu extensia acelorași puncte in exterior (centrifug), fixându-se lungimea in milimetri (Le). Disponibilitatea tegumentara fiziologica (Dt) s-a calculat după formula: Dt =Le – Ld. Rezultate. Cea mai mare disponibilitate fiziologica la nivelul gambei s-a determinat in regiunea lamboului safen (5.05±0.29 cm; n=30; p=0.033), urmata de regiunea lamboului sural (4.83±0.25 cm; n=30; p=0.028) si regiunea lamboului tibial anterior (4.28±0.20 cm; n=30; p=0.03). Cea mai mica disponibilitate fiziologica s-a determinat în regiunea lamboului supramaleolar (3.04±0.21 cm; n=30; p=0.018). Concluzii. În urma studiului efectuat am constatat ca ridicarea unui lambou cu lățimea disponibila fiziologica a regiunilor donatoare la gamba nu va produce probleme de închidere a plăgii donore, fiind suturata primar plan cu plan.Introduction. This study was conducted to determine the optimal, available width of the flap’s donor site that will not harm the primary closure of donor wound. Purpose. To assess the skin physiological availability of each donor region of the calf. Material and methods. The study was conducted on a group of 30 volunteers, assessing healthy limbs. Age limits in group were 20-60 years, divided into categories of 10 years, including at least 5 volunteers each category. Physiological availability was calculated for flaps: saphenous, sural, superficial peroneal, suprameleolar, fibular, posterior and anterior tibial. The skin was fold in the center of donor territory (centripetal) until the folded parts was contacting, forming a folding (Ld). Folding’s thickness was measured, being passed on millimeter line. Subsequently, skin fold was unfolded to normal skin with the extension of the same points outside (centrifugal), attaching the length in millimeters (Le). Skin physiological availability (Dt) was calculated using the formula: Dt = Le - Ld. Results. Highest physiological availability was determined in region of saphenous flap (5.05±0.29 cm; n = 30; p = 0.033), followed by the sural flap (4.83±0.25 cm; n=30; p= 0.028) and region of anterior tibial flap (4.28±0.20 cm, n=30; p=0.03). The smallest physiological availability was determined in the region of supramalleolar flap (3.04±0.21 cm, n = 30; p = 0.018). Conclusions. From this study we found that raising a flap with physiological available width of donor regions of calf will not cause problems in donor wound’s closure, this being sutured primary

Static and dynamic magnetic response of fragmented haldane-like spin chains in layered Li3Cu2SbO6

The structure and the magnetic properties of layered Li3Cu2SbO6 are investigated by powder X-ray diffraction, static susceptibility, and electron spin resonance studies up to 330 GHz. The XRD data experimentally verify the space group C2=m with halved unit cell volume in contrast to previously reported C2=c. In addition, the data show significant Li=Cuintersite exchange. Static magnetic susceptibility and ESR measurements show two magnetic contributions, i.e., quasifree spins at low-temperature and a spin-gapped magnetic subsystem, with about half of the spins being associated to each subsystem. The data suggest ferromagnetic-antiferromagnetic alternating chains with JFM = -285 K and JAFM = 160 K with a significant amount of Li-defects in the chains. The results are discussed in the scenario of fragmented 1D S = 1 AFM chains with a rather high defect concentration of about 17% and associated S =1=2 edge states of the resulting finite Haldane chains. © 2016 The Physical Society of Japan