HASTANELERDE YENİ İLETİŞİM TEKNOLOJİLERİ KULLANIMININ KURUM İÇİ İLETİŞİM DOYUMUNA ETKİSİ

Hastanelerde örgütsel hedeflerin başarılabilmesi ancak, örgütü belirlenmiş amaçlara ulaştıran, etkili kılan, hizmetin maddi ve emek yönünü harekete geçirecek ahengi sağlayan iletişim sürecinin doğru işlemesi ile olacaktır. Sağlık yöneticisinin doğru iletişim kanallarını kullanmaması hedeflenen amaçların gerçekleştirilmesini sekteye uğratacaktır. Kesitsel tipte olan bu araştırmanın evreni; İstanbul Anadolu yakasında bulunan iki özel hastane ve farklı kamu hastaneleri birliğine bağlı olmak üzere iki eğitim ve araştırma hastanesi çalışanlarından oluşmaktadır. Anket yöntemiyle toplanan veriler SPSS 22.0 programına aktarılarak değerlendirmiştir. Anket geçerlilik ve güvenirliği faktör analizi  ile test edilmiş ve verilerin değerlendirilmesinde Anova ve student t testi kullanılmıştır. Katılımcıların genel iletişim doyumu düzeyi incelendiğinde orta düzeyde kurum içi iletişim doyumuna sahip oldukları tespit edilmiştir. İletişim sürecinde yeni iletişim kanallarından daha az yararlandığı tespit edilen Kamu hastanesi çalışanlarının iletişim doyumu orta düzeyde iken yeni iletişim teknolojilerini daha fazla kullandığı gözlenen Özel hastane çalışanlarının iletişim doyumu yüksek düzeydedir

Congenital absence of the pericardium: A rare cause of right ventricular dilatation and levoposition of the heart

Congenital absence of the pericardium is a rare cardiac defect with variable clinical presentations and is usually discovered incidentally. The pathology may lead to serious complications such as incarceration of cardiac tissue, myocardial ischemia, aortic dissection or valvular insufficiency. Diagnosis is not difficult so long as some tips are remembered. We present the cases of two patients with congenital absence of left pericardium

Analysis of the Probable Signature of Mid-Latitude Electron Density Trough at the Ionospheric Critical Frequencies over Europe

In this study, probable signature of mid-latitude electron density trough at the ionospheric critical frequencies is investigated. For this purpose, hourly ionospheric critical frequency (foF2) data obtained from ionosonde stations for the year 1972 is used. These stations are situated at between 45o - 66oinvariant magnetic latitudes (Λ) of the Northern hemisphere. foF2 data is investigated in terms of local time (LT), seasons, Λ and geomagnetic activity (Kp) variations. The results show that the troughs occur at nighttime hours between dusk and dawn sector for all situations. The troughs at geomagnetic active (Kp>2+) conditions are more prominent and apparent than that at geomagnetic quiet (Kp≤2+) conditions. The troughs and their minimum positions tend to occur at lower Λ for all four seasons at geomagnetic active conditions. Also, the average of foF2 values in the minimum points of the troughs has lower values at geomagnetic active conditions. It is observed that the seasonal variations have important effects on the structure of trough, especially for December Solstice. The results of this study will contribute a better description and prediction of the mid-latitude electron density trough features for the ionospheric F2 peak heights and better understanding the role of the mid-latitude electron density trough on the ionospheric variability

Thermally buffering polyethylene/halloysite/phase change material nanocomposite packaging films for cold storage of foods

Nanocomposite flexible food packaging films that prolong the time that frozen or chilled food products stay cold are demonstrated. Nanohybrids of phase change materials (PCMs) and halloysite nanotubes (HNTs) were prepared as nanofillers with thermal buffering performance. HNTs were impregnated with polymeric PCMs, PEG400 and PEG600, resulting in a mixture of form-stable HNT/PCM nanohybrids that presented consecutive melting transitions in the temperature range of -22 degrees C - 22 degrees C. The incorporation of the mixture of HNT/PEG400 and HNT/PEG600 nanonybrids into polyethylene (PE) matrix by melt compounding resulted in flexible nanocomposite films that have acceptable mechanical properties for use in food packaging applications and presented a broad melting transition from -17 degrees C to 26 degrees C with a latent heat of 2.3 J/g. The thawing rate of frozen nanocomposite films at room temperature was less than half of the thawing rate of neat PE films. Furthermore, nanocomposite films delayed the warming of frozen and chilled samples for 18 min and 20 min, respectively, relative to neat PE films. Nanocomposite films composed of PCM impregnated HNTs demonstrated here are the first examples of flexible food packaging films with significant thermal buffering capacity in cold chain temperatures and have a great potential to enhance food quality and food safety in cold-chain storage and transportation

YÜKSEK ENLEM foF2 DEĞERLERİNDEKİ DEĞİŞİMLERİN JEOMANYETİK AKTİVİTEYE BAĞLILIĞI

Bu çalışmada, Aralık 1971-Eylül 1972 tarihleri arasında yüksek enlem bölgesi olarak tanımlanan 60o-90o değişmeyen manyetik enlem arasındaki 7 iyonsonda istasyonundan alınan saatlik foF2 verilerinin değişmeyen manyetik enleme göre değişimleri, farklı jeomanyetik aktivite durumları için incelenmiştir. Analizlerden elde edilen sonuçlara göre, gündüz saatlerindeki foF2 değerlerinin, gece saatlerindeki değerlerden büyük olduğu, ayrıca bu saatlerde foF2 değerlerinin değişmeyen manyetik enlem artışı ile 68o-72o değişmeyen manyetik enlemleri arasındaki artış dışında azaldığı tespit edilmiştir. Gece saatlerinde ise foF2 değerlerinin yaklaşık 66o-72o değişmeyen manyetik enlemleri arasında arttığı, bu enlemlerden daha büyük ve daha küçük enlemlerde ise foF2 değerlerinin azalarak çukura benzer bir yapı oluşturduğu gözlemlenmiştir. Ayrıca mevsimsel ve jeomanyetik aktivite değişimlerinin, foF2 değerlerinin enlemsel değişimleri üzerinde önemli bir etkiye sahip olduğu tespit edilmiştir. Jeomanyetik pasif durumdaki foF2 değerleri, jeomanyetik aktif durumdaki foF2 değerlerinden büyüktür. Özellikle jeomanyetik aktif durumdaki Aralık döneminde, polar cap ve polar oval bölgeleri daha belirgin ve bu bölgeler enlemsel olarak daha geniş bir yapıya sahiptir

Lysostaphin-functionalized waterborne polyurethane/polydopamine coatings effective against S. aureus biofilms

Hybrid waterborne polyurethane/polydopamine (WPU/PDA) matrix, showing the adhesive properties of PDA in its entirety, was utilized for the immobilization of lysostaphin (Lys), an important anti-staphylococcal agent, to obtain highly effective antibacterial and antibiofilm surface coatings. WPU/PDA matrix prepared by the encapsulation of WPU particles with PDA in aqueous dispersion was applied as coatings on substrates, and the facile incubation of the WPU/PDA-coated surfaces with Lys in aqueous solution resulted in WPU/PDA/Lys coatings that contained immobilized Lys on the surface. WPU/PDA/Lys coatings showed strong anti-Staphylococcus aureus activity with a 4 log reduction in the number of cells. Furthermore, WPU/PDA/Lys coatings were demonstrated to be durable without any enzyme leakage, and their antibacterial activity was preserved for at least 30 days and over multiple exposures to bacteria. WPU/PDA/Lys coatings presented significant antibiofilm activity against S. aureus with a 3.5 log reduction in the number of surface-attached bacteria. WPU/PDA/Lys coatings that are easy-to-apply to almost any surface, non-toxic, and environmentally friendly provide promising antibacterial and antibiofilm surfaces that are effective against S. aureus

NIR-responsive waterborne polyurethane-polydopamine coatings for light-driven disinfection of surfaces

Apart from conventional chemical-based methods, alternative disinfection methods that can physically destroy bacteria are needed. Here, biocompatible, non-toxic, environmentally friendly hybrid coatings prepared from dispersions of polydopamine-coated waterborne polyurethane particles (WPU-PDA) that offer effective light-to-heat conversion were designed to eradicate pathogenic bacteria and biofilms using photothermal therapy. The resulting WPU-PDA hybrid coatings demonstrated an effective photothermal activity by reaching 155 °C under 4 min NIR-laser irradiation and staying stable upon multiple irradiation cycles. WPU-PDA coatings induced hyperthermia on S. aureus resulting in a 3.5 log reduction of viable cells with a killing activity that is stable for at least 20 contamination/disinfection cycles. Furthermore, the prepared coatings were shown to have antibiofilm properties resulting in a 3 min NIR-light activated 3.9 log reduction in the viability through physical disruption of biofilm bacteria. Light-activated antibacterial/antibiofilm coatings demonstrated here provide a strong potential for NIR-light activated disinfection of surfaces

Polydopamine-coated halloysite nanotubes for sunlight-triggered release of active substances

A sunlight-triggered controlled release system comprising environmentally friendly components is presented herein. The combination of a photothermal nanocarrier that can be remotely heated by sunlight and a heat-activatable stopper that can be removed via sunlight-triggered heating of the nanocarriers resulted in a smart controlled release system. Surfaces of halloysite nanotubes (HNTs) were coated with a polydopamine (PDA) layer to create a photothermal nanocarrier that heats up when irradiated with sunlight. The resulting HNT-PDA nanocarriers were impregnated with carvacrol, a volatile essential oil as a model active substance, and were further functionalized with lauric acid, as a stopper layer. The presence of lauric acid hindering the carvacrol release from HNT-PDA nanocarriers was confirmed by differential scanning calorimetry and transmission electron microscopy imaging. HNT-PDA nanocarriers were shown to be heated to 45 °C upon sunlight irradiation for 10 min, demonstrating that their sunlight activation can trigger the melting of the lauric acid stopper. In the absence of the light trigger, the lauric acid stopper slowed down and hindered the carvacrol release. Only 40% of impregnated carvacrol was released from the lauric acid-functionalized nanocarriers in 60 days, whereas all carvacrol molecules were released in 30 days when the lauric acid stopper was not present. Release of carvacrol molecules that were entrapped in the HNT-PDA nanocarriers with the lauric acid stopper was shown to be controlled with sunlight. 10-15% of impregnated carvacrol molecules were released upon sunlight irradiation for 6 h, and carvacrol release stopped when the sunlight irradiation was turned off, where 92% of all carvacrol was released over 6 consecutive light-on/light-off cycles. The presented clay nanotube-based controlled release system comprising a photothermal nanocarrier and a heat-activatable stopper demonstrated excellent sunlight-triggered release behavior and therefore can be utilized in various applications requiring remote control of active substance release

Waterborne polydopamine-polyurethane/polyethylene glycol-based phase change films for solar-to-thermal energy conversion and storage

Form-stable phase change films composed of a polydopamine-polyurethane polymer matrix with photothermal conversion properties and polyethylene glycol (PEG) are presented. Surfaces of environmentally friendly waterborne polyurethane (WPU) particles in aqueous dispersions were coated with polydopamine to create a stable waterborne dispersion of a polydopamine-polyurethane (PDA-WPU) matrix, which intrinsically presents significant photothermal conversion properties, and PEG was directly integrated into the PDA-WPU matrix by simple mixing in the dispersion form. Successful film formation was achieved at PDA-WPU to PEG ratios of 1:1 and higher by weight, resulting in form-stable, homogeneous PDA-WPU/PEG phase change films. Incorporation of PEG into the amorphous PDA-WPU matrix was demonstrated to impart a semicrystalline character to PDA-WPU films, which also increased their thermal stability and thermal conductivity. Young's modulus of PDA-WPU/PEG films increased while the tensile strength and elongation at break values decreased as a function of PEG content, yet all films showed a flexible behavior. For the films prepared with the highest amount of PEG (PDA-WPU:PEG 1:1), the melting and solidifying enthalpies were calculated to be 81.1 and 77.9 J/g, respectively, and enthalpies remained the same over 60 consecutive heating-cooling cycles. The temperature of the PDA-WPU:PEG 1:1 film reached 74.8 °C under 20 min of solar irradiation at 150 mW/cm2 with a solar-to-thermal energy conversion efficiency of 72.9%. In a cold environment, PDA-WPU/PEG films and their surroundings were shown to heat up more than controls under solar light and stay warmer after the solar irradiation was stopped. The temperature of the environment surrounded with the PDA-WPU/PEG film increased 10 °C more than the temperature of the control environment under 30 min of sunlight irradiation. Upon switching the sunlight irradiation off, the PDA-WPU/PEG environment cooled down to ambient temperature 10 min later than the control environment, demonstrating that these form-stable, flexible, and durable films can efficiently harvest and store sunlight and have strong potential as solar-driven thermoregulating materials