bluuebunny/crossref_metadata_2025 huggingface dataset:
Iliac Veins Are More Compressible Than Iliac Arteries: A New Method of Testing
Authors: Brass Margaret , Kassab Ghassan S.
Published: July 2019

Incompressibility implies that a tissue preserves its volume regardless of the loading conditions. Although this assumption is well-established in arterial wall mechanics, it is assumed to apply for the venous wall without validation. The objective of this study is to test whether the incompressibility assumption holds for the venous wall. To investigate the vascular wall volume under different loading conditions, inflation-extension testing protocol was used in conjunction with intravascular ultrasound (IVUS) in both common iliac arteries (n = 6 swine) and common iliac veins (n = 9 dogs). Use of IVUS allows direct visualizations of lumen dimensions simultaneous with direct measurements of outer dimensions during loading. The arterial tissue was confirmed to preserve volume during various load conditions (p = 0.11) consistent with the literature, while the venous tissue was found to lose volume (about 35%) under loaded conditions (p < 0.05). Using a novel methodology, this study shows the incompressibility assumption does not hold for the venous wall especially at higher pressures, which suggests that there may be fluid loss through the vein wall during loading. This has important implications for coupling of fluid transport across the wall and biomechanics of the wall in healthy and diseased conditions.
Nasal mucosal melanoma as a cause of epistaxis
Authors: Behranwala Ruqaiyah , Loku Waduge Bhagya Harindi , Teo Bervin
Published: July 2019

A 43-year-old woman presented with an 8-week history of fatigue and recurrent right sided nasal bleeds progressing to significant pain and swelling on the right side of her face. Clinical examination revealed a friable mass in her right nasal passage. A biopsy and staging positron emission tomography-CT scan confirmed the diagnosis of a T4 N1 M1 BRAF wild type mucosal melanoma. The melanoma had metastasised to the right paranasal sinuses, right and left neck nodes, right submental node, right upper breast, liver, the subcutaneous fat of the left buttock and the right iliac bone as well as cerebral metastasis with further disease progression. Combination immunotherapy was started but initially suspended due to an adverse reaction to nivolumab and restarted in due course. Surgical debulking was carried out for symptomatic relief. This case report explores the delay in diagnosis of mucosal melanoma with its subsequent consequences and the lack of understanding of associated risk factors and optimal treatment.
Non-operatively managed case of contained jejunal diverticular perforation
Authors: Jambulingam Raja , Nanayakkara Gayan
Published: July 2019

Jejunal diverticulosis is an underdiagnosed condition due to its relatively benign existence and uncharacteristic presentation. The complications can be very severe and, due to its often late diagnosis, patients may require urgent surgery. We present a woman who initially complained of non-specific abdominal symptoms but was diagnosed with a contained jejunal diverticular perforation relatively early. We managed her non-operatively with intravenous antibiotics from which she recovered well. She was discharged 2 days later and has remained completely well. Follow-up at 3 months showed no recurrence. Our case differs from most of the literature due to the early diagnosis and successful non-operative management of the patient. We conclude that, in cases of non-specific abdominal pain with diagnostic ambiguity, a diagnosis of small bowel diverticulosis should be considered. It should be managed non-operatively where possible.
Intralesional and subarachnoid bleeding of a spinal schwannoma presenting with acute cauda equina syndrome
Authors: Dobran Mauro , Nasi Davide , Della Costanza Martina , Formica Francesco
Published: July 2019

We present an unusual case of spinal neurinoma with intralesional and subarachnoid bleeding with acute cauda equina syndrome. A 38-year-old man was admitted to our department after a minor thoracic spinal trauma with right lower limb plegia and urinary retention. MRI showed a T11 intradural tumour with intralesional and subarachnoid haemorrhage. The patient was operated of spinal cord decompression and complete tumour resection. The histological examination documented a schwannoma with large haemorrhagic intratumoural areas. A full neurological recovery was documented at 6-month follow-up.
Splenic rupture as a rare and unpredicted complication in a patient with systemic lupus erythematosus after colonoscopy
Authors: Thavaraputta Subhanudh , Laoveeravat Passisd , Thavaraputta Bhakhathorn , Rakvit Ariwan
Published: July 2019

Colonoscopy is a common procedure that gastroenterologists perform on a daily basis. It is considered a low-risk outpatient procedure and patients can be discharged on the same day after the procedure. Colonoscopy has become more feasible with the increasing application of standard screening for colon cancer and diagnostic procedures for large intestinal disease. There are reported possible risk factors of splenic rupture during the procedure. However, splenic injury after colonoscopy is considered a rare complication and less than 100 cases have been reported in international literature. Interestingly, this is the first case report demonstrating systemic lupus erythematosus (SLE) as a possible risk factor leading to splenic rupture post-colonoscopy. Failure to recognise this possibility even in its rarity can lead to life-threatening complications. We present a case of an acute splenic rupture with massive intraperitoneal bleeding after colonoscopy in a patient with SLE.
Fever with persistent flagellate erythema in a primigravida: a rare presentation of adult-onset Still’s disease
Authors: Bhatia Riti , Kaeley Nidhi , Kant Ravi , Basi Ankith
Published: July 2019

We describe a case of a 25-year-old primigravida, who presented to the emergency department with fever, arthralgia and erythematous maculopapular eruption. There was confluent violaceous macular erythema on the arms, v-area of the neck and upper back with periorbital oedema, mimicking dermatomyositis. There was flagellate erythema on the back. Skin biopsy and systemic investigations helped to rule out dermatomyositis. A final diagnosis of adult-onset Still’s disease with atypical cutaneous manifestations was made. This atypical variant is associated with a worse prognosis. Early recognition of this clinical variant can be life-saving for the patient.
Hepatic artery pseudoaneurysm following percutaneous transhepatic cholangiogram: an extremely rare complication
Authors: Tirumanisetty Pratyusha , Sotelo Jose William , Rander Aditya , Syed Taussif
Published: July 2019

A 72-year-old female patient who was admitted for ischaemic stroke had developed ascending cholangitis. Percutaneous transhepatic cholangiogram was performed to drain the infected bile, but this was complicated by haemorrhagic shock and hepatic haematoma. Mesenteric angiogram showed right hepatic artery (RHA) pseudoaneurysm which was embolised, there by stopping her bleeding. RHA is normally located posterior to common bile duct (CBD). An uncommon location of RHA is anterior to CBD, which can lead to haemorrhagic complications during percutaneous cholangiogram.
Intraperitoneal bladder explosion during transurethral surgery
Authors: Gupta Jagdish , Gupta Archit
Published: July 2019

Transurethral resection of prostate (TURP) is the most common operation performed for obstruction secondary to prostatic enlargement. Though considered as a safe procedure, occasionally life-threatening complications may be seen. Intravesical explosion, secondary to ignition by diathermy of the accumulated mixture of hydrogen, hydrocarbons and higher concentration of oxygen, is a rarely reported complication (only 38 cases reported until). We are reporting a 60-year-old man suffering from benign prostatic hyperplasia in whom during TURP bladder explosion occurred which was suspected early and immediately explored and repaired leading to a favourable outcome.
Toe necrosis: report of uncommon aetiology
Authors: Mansouri Siham , Bounsir Ayoub , Benzekri Laila , Hassam Badr
Published: July 2019

Toe necrosis has many aetiologies. The most common one is ischaemia. In fact, both direct and indirect toe necrosis, as well as related lower limb gangrene, could be secondary to mechanical trauma, infections, pharmacological sensitivity, cancer, blue toe syndrome and other granulomatous diseases. We report a case of toes necrosis caused by an uncommon aetiology.
Risk factors for postoperative delirium in patients undergoing lower extremity joint arthroplasty: a retrospective population-based cohort study
Authors: Memtsoudis Stavros , Cozowicz Crispiana , Zubizarreta Nicole , Weinstein Sarah M , Liu Jiabin , Kim David H , Poultsides Lazaros , Berger Marc Moritz , Mazumdar Madhu , Poeran Jashvant
Published: July 2019

Background

With an ageing population, the demand for joint arthroplasties and the burden of postoperative delirium is likely to increase. Given the lack of large-scale data, we investigated associations between perioperative risk factors and postoperative delirium in arthroplasty surgery.

Methods

This retrospective population-based cohort study, utilized national claims data from the all-payer Premier Healthcare database containing detailed billing information from >25% nationwide hospitalizations. Patients undergoing elective total hip/knee arthroplasty surgery (2006–2016) were included.

The primary outcome was postoperative delirium, while potential risk factors included age, gender, race, insurance type, and modifiable exposures including anesthesia type, opioid prescription dose (low/medium/high), benzodiazepines, meperidine, non-benzodiazepine hypnotics, ketamine, corticosteroids, and gabapentinoids.

Results

Among 1 694 795 patients’ postoperative delirium was seen in 2.6% (14 785/564 226) of hip and 2.9% (32 384/1 130 569) of knee arthroplasties. Multivariable models revealed that the utilization of long acting (OR 2.10 CI 1.82 to 2.42), combined long/short acting benzodiazepines (OR 1.74 CI 1.56 to 1.94), and gabapentinoids (OR 1.26 CI 1.16 to 1.36) was associated with increased odds of postoperative delirium. Lower odds of postoperative delirium were seen for neuraxial versus general anesthesia (OR 0.81 CI 0.70 to 0.93) and with the utilization of non-steroidal anti-inflammatory drugs (OR 0.85 CI 0.79 to 0.91) as well as cyclooxygenase-2 inhibitors (OR 0.82 CI 0.77 to 0.89). Age-stratified analysis revealed lower odds with high versus low opioid dose (OR 0.86 CI 0.76 to 0.98) in patients >65 years. Findings were consistent between hip and knee arthroplasties.

Conclusions

In this large national cohort, we identified various modifiable risk factors (including anesthesia type and pharmaceutical agents) for postoperative delirium, demonstrating possible prevention pathways.
The impact of obesity on severity of solid organ injury in the adult population at a Level I trauma center
Authors: Chen Allen K , Jeffcoach David , Stivers John C , McCullough Kyle A , Dirks Rachel C , Boehnke Ryland J , Sue Lawrence , Kwok Amy M , Wolfe Mary M , Davis James W
Published: July 2019

Background

The obese (body mass index, BMI > 30) have been identified as a subgroup of patients in regards to traumatic injuries. A recent study found that high-grade hepatic injuries were more common in obese than non-obese pediatric patients. This study seeks to evaluate whether similar differences exist in the adult population and examine differences in operative versus non-operative management between the obese and non-obese in blunt abdominal trauma.

Methods

Patient with trauma evaluated at an American College of Surgeons verified Level I trauma center from February 2013 to November 2016 were retrospectively reviewed. All patients aged>18 years with blunt mechanism of injury and a BMI listed in the trauma registry were included. Patients were excluded for incomplete data, including BMI or inability to grade hepatic or splenic injury. Data collected included age, gender, BMI, injury severity score, hospital length of stay, procedures on liver or spleen, and mortality. Organ injuries were scored using the American Association for the Surgery of Trauma grading scales, and were determined by either imaging or intraoperative findings. Obesity was classified as BMI > 30 compared with non-obese with BMI < 30.

Results

During the study period, 9481 patients were included. There were 322 spleen injuries and 237 liver injuries, with 64 patients sustaining both liver and splenic injuries. No differences existed in the percentage of high-grade hepatic or splenic injuries between the obese and non-obese. Obese patients with liver injuries were more likely to have procedural intervention than non-obese liver injuries and had higher rates of mortality. No differences were found in intervention for splenic injury between obese and non-obese.

Conclusions

Contrary to prior studies on adult and pediatric patients with trauma, this study found no difference between obese and non-obese patients in severity of solid organ injury after blunt abdominal trauma in the adult population. However, there was an increased rate of procedural intervention and mortality for obese patients with liver injuries.

Level of Evidence

3.
Predictors of splenic artery embolization as an adjunct to non-operative management of stable blunt splenic injury: a multi-institutional study
Authors: Salottolo Kristin , Carrick Matthew M , Madayag Robert M , Yon James , Tanner Allen , Mains Charles W , Topham Andrew , Lieser Mark , Acuna David , Bar-Or David
Published: July 2019

Background

We sought to identify predictors of splenic artery embolization (SAE) over observation for hemodynamically stable patients with blunt splenic injury (BSI), by Organ Injury Scale (OIS) grade.

Methods

This was a multi-institutional retrospective study of all adults (≥18) with BSI who were initially managed non-operatively between 2014 and 2016. Multivariate logistic regression analysis was used to identify predictors of SAE by OIS grade. Covariates included radiographic characteristics (presence/quantity of hemoperitoneum, blush, vascular injury), demographics (age, sex, cause), Injury Severity Score, vital signs, and hemoglobin values. We also examined outcomes of death, length of stay (LOS), intensive care unit (ICU) admission, blood products, and failed non-operative management (NOM).

Results

Among 422 patients with stable BSI, 93 (22%) had SAE and 329 (78%) were observed. The rate of SAE increased by grade (p<0.001). In grade I and II BSI, 7% had SAE; significant predictors of SAE were blush (OR: 5.9, p=0.02), moderate or large hemoperitoneum (OR: 3.0, p=0.01), and male sex (OR: 6.3, p=0.05). In grade III BSI, 26% had SAE; significant predictors included moderate or large hemoperitoneum (OR: 3.9, p=0.04), motor vehicle crash (OR: 6.1, p=0.005), and age (OR=1.4, 40% with each decade increase in age, p=0.02). The rate of SAE was 52% for grade IV and 85% for grade V BSI; there were no independent predictors of SAE in either grade. Clinical outcomes were comparable by NOM strategy and grade, except longer LOS with SAE in grades I–III (p<0.05) and longer ICU LOS with SAE in grades I–IV (p<0.05). Only 5 (1.2%) patients failed NOM (4 observation, 1 SAE).

Conclusion

These results strongly support SAE consideration for patients with stable grade IV and V BSI even if there are no other high-risk clinical or radiographic findings. For grades I–III, the identified predictors may help refine consideration for SAE.

Level of evidence

Level III, retrospective epidemiological study.
Variation in the use of MRI for cervical spine clearance: an opportunity to simultaneously improve clinical care and decrease cost
Authors: Albaghdadi Alia , Leeds Ira L. , Florecki Katherine L. , Canner Joseph K. , Schneider Eric B. , Sakran Joseph V. , Haut Elliott R.
Published: July 2019

Background

For years, controversy has existed about the ideal approach for cervical spine clearance in obtunded, blunt trauma patients. However, recent national guidelines suggest that MRI is not necessary for collar clearance in these patients. The purpose of this study was to identify the extent of national variation in the use of MRI and assess patient-specific and hospital-specific factors associated with the practice.

Methods

We performed a retrospective review of the National Trauma Data Bank from 2007 to 2012. We included blunt trauma patients aged ≥18 years, admitted to level 1 or 2 trauma centers (TCs), with a Glasgow Coma Scale <8, Abbreviated Injury Scale >3 for the head and mechanically ventilated for more than 72 hours. Multilevel modeling was used to identify patient-level and hospital-level factors associated with spine MRI use.

Results

32 125 obtunded, blunt trauma patients treated at 395 unique TCs met our inclusion criteria. The mean proportion of patients who received MRI over the entire sample was 9.9%. The proportions of patients at each hospital who received a spine MRI ranged from 0.5% to 68.7%. Younger patients, with injuries from motor vehicle collisions and pedestrian injuries, were more likely to receive MRI. When controlling for other variables, Injury Severity Score (ISS) was not associated with MRI use. Hospitals in the Northeast, level 1 TCs and non-teaching hospitals were more likely to obtain MRIs in this patient population.

Conclusion

After controlling for patient-level characteristics, variation remained in MRI use based on geography, trauma center level and teaching status. This evidence suggests that current national guidelines limiting the use of MRI for cervical spine evaluation following blunt trauma are not being followed consistently. This may be due to physicians not being up to date with best practice care, unavailability of locally adopted protocols in institutions or lack of consensus among clinical providers.

Level of evidence

Prognostic and epidemiological, level III.
Interrelations Between Arterial Stiffness, Target Organ Damage, and Cardiovascular Disease Outcomes
Authors: Vasan Ramachandran S. , Short Meghan I. , Niiranen Teemu J. , Xanthakis Vanessa , DeCarli Charles , Cheng Susan , Seshadri Sudha , Mitchell Gary F.
Published: July 2019

Background

Excess transmission of pressure pulsatility caused by increased arterial stiffness may incur microcirculatory damage in end organs (target organ damage
[TOD]
) and, in turn, elevate risk for cardiovascular disease (
CVD
) events.

Methods and Results

We related arterial stiffness measures (carotid‐femoral pulse wave velocity, mean arterial pressure, central pulse pressure) to the prevalence and incidence of
TOD
(defined as albuminuria and/or echocardiographic left ventricular hypertrophy) in up to 6203 Framingham Study participants (mean age 50±15 years, 54% women). We then related presence of
TOD
to incident
CVD
in multivariable Cox regression models without and with adjustment for arterial stiffness measures. Cross‐sectionally, greater arterial stiffness was associated with a higher prevalence of
TOD
(adjusted odds ratios ranging from 1.23 to 1.54 per
SD
increment in arterial stiffness measure,
P
<0.01). Prospectively, increased carotid‐femoral pulse wave velocity was associated with incident albuminuria (odds ratio per
SD
1.28, 95%
CI,
1.02–1.61;
P
<0.05), whereas higher mean arterial pressure and central pulse pressure were associated with incident left ventricular hypertrophy (odds ratio per
SD
1.37 and 1.45, respectively;
P
<0.01). On follow‐up, 297 of 5803 participants experienced a first
CVD
event. Presence of
TOD
was associated with a 33% greater hazard of incident
CVD
(95%
CI
, 0–77%;
P
<0.05), which was attenuated upon adjustment for baseline arterial stiffness measures by 5–21%.

Conclusions

Elevated arterial stiffness is associated with presence of
TOD
and may partially mediate the relations of
TOD
with incident
CVD
. Our observations in a large community‐based sample suggest that mitigating arterial stiffness may lower the burden of
TOD
and, in turn, clinical
CVD
.
Prevalence and Cardiovascular Health Impact of Family History of Premature Heart Disease in the United States: Analysis of the National Health and Nutrition Examination Survey, 2007–2014
Authors: Moonesinghe Ramal , Yang Quanhe , Zhang Zefeng , Khoury Muin J.
Published: July 2019

Background

Because family history is a known risk factor for heart disease, it is important to characterize its public health impact in terms of population prevalence of family history of heart disease, the burden of heart disease attributable to family history, and whether family history interacts with modifiable risk factors for heart disease.

Methods and Results

We used population data from NHANES (the National Health and Nutrition Examination Survey [2007–2014]) to measure the association of self‐reported family history of premature heart disease (
FHPHD
) with cardiovascular disease (n=19 253) and to examine the association between cardiovascular health metrics and
FHPHD
(n=16 248). Using logistic regression and multivariable adjustment, family history odds ratios were 5.91 (95%
CI
, 3.34–10.44) for ages 20 to 39, 3.02 (95% CI, 2.41–3.79) for ages 40 to 59, and 1.87 (95%
CI
, 1.54–2.28) for age ≥60 for cardiovascular disease. The prevalence of cardiovascular disease for the population with a
FHPHD
(15.72%; 95%
CI
, 13.81–17.64) was more than double the prevalence of cardiovascular disease for those without a family history (6.25%; 95%
CI
, 5.82–6.69). Compared with participants with optimum cardiovascular health, the prevalence ratio for
FHPHD
was 1.98 (95%
CI
, 1.40–2.79) for those with inadequate cardiovascular health.

Conclusions

Millions of people who are at high risk of having cardiovascular disease could be identified using
FHPHD
.
FHPHD
can become an important component of public health campaigns that address modifiable risk factors that plan to reduce the overall risk of heart disease.
ÖRGÜTSEL SESSİZLİK ÖLÇEĞİ’NİN TÜRKÇEYE UYARLANMASI
Authors: ÇAVUŞOĞLU Selin , KÖSE Sevinç
Published: July 2019

Literatürde,
örgütsel sessizlik düzeyini belirlemek üzere farklı yazarlar tarafından
geliştirilen ölçekler mevcuttur. Bu ölçeklerden biri de Knoll ve Dick
tarafından geliştirilen örgütsel sessizlik ölçeğidir. Çalışmanın amacı, bu
ölçeğin Türkçe literatürde geçerlilik ve güvenilirlik araştırmasını yapmaktır.
İlk adımda ölçeğin Türkçeye çevrilmesi gerçekleştirilmiştir. İkinci adımda
çevirisi yapılan ölçeğin geçerliliği analiz edilmiştir. Bu aşamada öncelikle
ölçeğin içerik/kapsam geçerliliği bakımından uzman öğretim üyeleri tarafından
değerlendirilmesi sağlanmıştır. Uzman değerlendirmeleri sonrasında ölçeği
içeren bir anket formu 150 akademisyene uygulanmıştır. Bu uygulama neticesinde
elde edilen verilerle açıklayıcı ve doğrulayıcı faktör analizleri yapılmıştır.
Son olarak oluşturulan ölçeğin güvenilirliği analiz edilmiştir. Yapılan
analizler sonucunda ölçeğin Türkçe alan yazında kullanılabileceği görülmüştür.
SAĞLIK ÇALIŞANLARINDA HASTA GÜVENLİĞİ KÜLTÜRÜ ALGISININ DEĞERLENDİRİLMESİ ÜZERİNE BİR ARAŞTIRMA
Authors: OKSAY Aygen , KILINÇ Mehmet , SAYHAN Mehmet
Published: July 2019

Sağlık sektöründe artan rekabet neticesinde hizmet sunumunda yükselen
kalite, hasta güvenliği kavramının önemini arttırmıştır. Verilen hizmet
esnasında hastaların güvenliğini tehdit eden herhangi bir unsur insan sağlığı
açısından telafi edilemeyen sağlık sorunlarına ya da insan hayatının
kaybedilmesine yol açabilmektedir. Bu bakımdan sağlık çalışanlarının hasta
güvenliği algıları ve sağlık kurumlarında oluşturulan hasta güvenliği kültürü
hizmet kalitesini etkilemekte, insan sağlığı açısından daha da önemli hale
gelmektedir. Çalışma sağlık çalışanlarının hasta güvenliği kültürü algısını
değerlendirmek, demografik verilerle ilişkisini incelemek amacıyla
gerçekleştirilmiştir. Hasta güvenliği kültürüne ilişkin mevcut durumu ortaya
koyması açısından uygulamalı ve betimsel bir çalışma niteliğindedir. Çalışma
bulgularına göre, sağlık çalışanlarının hasta güvenliği kültürü aritmetik
ortalamalarının orta düzeyin üzerinde olduğu saptanmıştır. Hasta güvenliği
kültürü ile yaş, görev, görev yılı ve görev yeri arasında anlamlı ilişki tespit
edilmiştir.
YURTDIŞI YERLEŞİKLERİNİN HİSSE SENEDİ YATIRIMLARININ BORSA İSTANBUL’A ETKİSİ
Authors: POLAT Müslüm , KILIÇ Ethem
Published: July 2019

Bu çalışmada,
yurtdışı yerleşiklerin menkul kıymet portföy yatırımlarının BİST100 endeksi ile
ilişkisi araştırılmıştır. Çalışmada 01.01.2010 – 23.02.2018 dönemlerine ait
haftalık veriler yardımıyla değişkenler arasındaki eşbütünleşme ve nedensellik
ilişkisi Johansen eşbütünleşme ve Granger nedensellik testleriyle
incelenmiştir.  Sonuç olarak; değişkenler
arasında uzun dönemde anlamlı bir ilişkinin bulunduğu ve yurtdışı yerleşiklerin
menkul kıymet portföy yatırımlarından BIST100’e doğru tek yönlü nedensellik olduğu
tespit edilmiştir.
ZAMAN HIRSIZLIĞI ÖLÇEĞİNİN TÜRKÇE UYARLAMASININ GEÇERLİLİĞİNİN YENİDEN DEĞERLENDİRİLMESİ VE KİŞİLİK ÖZELLİKLERİ İLE ZAMAN HIRSIZLIĞI ARASINDAKİ İLİŞKİ
Authors: BABADAĞ Mustafa , KERSE Gökhan
Published: July 2019

Bu
araştırmanın iki temel amacı bulunmaktadır. Araştırmanın ilk amacı daha önce
Türkçe yazın açısından uygunluğu
belirlenmiş olan zaman hırsızlığı ölçeğinin, farklı örneklemlerden alınan
verilerle, tekrardan geçerliliğini sınamaktır. Araştırma ikinci olarak
ise çalışanların sorumluluk, duygusal dengelilik ve dışa dönüklük kişilik
özelliklerinin zaman hırsızlığı davranışı üzerindeki etkisini belirlemeyi
amaçlamaktadır. Araştırmada bu iki amaç doğrultusunda finans, tekstil, eğitim ve kamu sektörlerinde çalışan 123 personelden
anket yöntemi ile veri toplanmış ve verilerin analizleri SPSS ve AMOS
programlarıyla gerçekleştirilmiştir. Verilerin analizinde Açıklayıcı Faktör
Analizi, Doğrulayıcı Faktör Analizi, Korelasyon Analizi ve Regresyon Analizi
kullanılmıştır. Analizler sonucunda ulaşılan bulgulara göre zaman hırsızlığı
ölçeğinin Türkçe yazın açısından geçerliliği bir kez daha doğrulanmıştır.
Ayrıca kişilik özelliklerinden sadece sorumluluk özelliğinin zaman hırsızlığı
üzerindeki etkisi anlamlı olarak tespit edilmiş ve bu anlamlı etkinin negatif
yönlü olduğu sonucuna ulaşılmıştır.
KURUMSAL İMAJ ALGISINDA FİZİKİ UNSURLARIN MÜŞTERİ SADAKATİNE ETKİSİ: TARİHİ OTEL İŞLETMELERİNDE BİR İNCELEME
Authors: GÖKTAŞ KULUALP Halime , YİĞİT Mustafa
Published: July 2019

Günümüz rekabet koşullarında işletme
yöneticilerinin müşteri sadakati oluşturmalarında kurumsal imajın önemli bir
unsur olduğu kabul edilmektedir. Bu kapsamda araştırmanın amacı, kurumsal imaj algısında fiziki
unsurların müşteri sadakatine etkisini belirlemektir. Fiziki unsurların
özellikle tarihi otel işletmeleri müşterileri için değerli olduğu
öngörülmektedir. Bu amaçla, İstanbul Beyoğlu’nda Pera bölgesi adıyla anılan
bölgede yer alan 4 tarihi otelde konaklayan 271 müşteriye anket uygulanmıştır.
Analiz bulgularına göre, kurumsal imaj algısı boyutlarından personel hizmeti,
görsellik, donanım/ekipman, iç kalite, dış ve diğer etkenler boyutlarının müşteri
sadakati üzerinde anlamlı ve pozitif yönlü bir etkisi bulunmaktadır. Bu sonuca
dayanarak, işletme yöneticilerine fiziksel unsurlar çerçevesinde imaj oluşturma
çabalarında bulunmaları önerilmektedir.
TÜRKİYE VE AB ÜLKELERİNDE AR-GE HARCAMALARI İLE YÜKSEK TEKNOLOJİLİ ÜRÜN İHRACATI İLİŞKİSİ
Authors: SARIDOĞAN Hasan Önder
Published: July 2019

Bu çalışmanın amacı Türkiye ve 28 AB üyesi ülke verisi kullanılarak
2000-2016 dönemi için Ar-Ge harcamaları ve yüksek teknolojili ürün ihracatı
arasındaki uzun dönemli ilişkiyi araştırmaktır. Bu amaçla Westerlund Eş
Bütünleşme Testi, Panel DOLS ve Dumitrescu ve Hurlin Panel Granger Nedensellik
Testi kullanılmıştır. Analiz sonuçlarına göre Ar-Ge harcamaları ile yüksek
teknolojili ürün ihracatı arasında uzun dönemde istatistiksel olarak bir ilişki
bulunmaktadır. Bu bağlamda, Ar-Ge harcamalarındaki %1’lik artışın, yüksek
teknolojili ürün ihracatını %0,58 artırdığı tespit edilmiştir.
TÜRKİYE’DE EKONOMİK BÜYÜME VE TOPLAM FAKTÖR VERİMLİLİĞİ İLİŞKİSİ
Authors: DOĞAN ÇALIŞKAN Zehra , BİBER Ahmet Emre
Published: July 2019

Ekonomik
büyüme, sermayenin fiziki yapısının yanı sıra girdinin verimliliği ve
sermayenin teknolojik içeriği gibi faklı belirleyicilere de dayanmaktadır.
Büyümeye katkı sağlayan beş temel faktör bulunmaktadır. Bunlar işgücünün
miktarı, işgücünün kalitesi (nitelikli işgücü), fiziki sermaye miktarı,
teknolojik içerikli fiziki sermaye ve son olarak daha çok nitelikli işgücü ve
teknolojik içerikli sermaye tarafından belirlenen toplam faktör verimliliğidir.
Toplam faktör verimliliğinin aynı zamanda bilgi temelli ekonomik büyümenin kaynağı
olduğu ve özellikle küresel pazarlarda ülkelerin rekabet edebilirliğini
artıracağı için oldukça önemli olduğu düşünülmektedir. Bu nedenle çalışmada,
Granger nedensellik analizi kullanılarak Türkiye’nin 1950 ve 2016 yılları
arasında toplam faktör verimliliği ve ekonomik büyüme arasındaki ilişki
gözlemlenmiştir.
CHARACTERISTICS OF MOBILE COMMUNICATION DEMAND: THE CASE OF TURKEY
Authors: KAR Mikail
Published: July 2019

In this study, different types of demand for mobile communications are discussed and price elasticity, income elasticity and cross-price elasticity of demand are analyzed for the case of Turkey. In the analysis, multiple linear regression approach is preferred and 68 quarterly time series between 2001 and 2017 are used. This study is the most comprehensive and up-to-date analysis of the Turkey Mobile Telecommunications Market and contributes to the empirical market analysis literature. The results obtained are as follows: The demand for access to network has (-1.4) price elasticity, (0.7) income elasticity and (-0.2) cross elasticity. The demand for network usage has (-0.2) price elasticity, (0.4) income elasticity and (0.4) cross elasticity. The demand for mobile diffusion has (-1.3) price elasticity, (0.6) income elasticity and (-0.2) cross elasticity.
Reproductive activity, microhabitat use, and calling sites of Pristimantis bacchus (Anura: Craugastoridae)
Authors: Chinchilla-Lemus Wilfredo , Serrano-Cardozo Víctor Hugo , Ramírez-Pinilla Martha Patricia
Published: July 2019

Pristimantis bacchus is an endangered terrestrial frog, endemic to cloud forests of the northern part of the Cordillera Oriental in the Colombian Andes. The knowledge of its reproductive biology and microhabitat use can offer important information for future conservation programs. We evaluated the reproductive activity and microhabitat use for both sexes, and selection of calling sites by males during rainy and dry seasons. Individuals of all reproductive conditions were observed throughout the sampled months; however, we observed a higher abundance of frogs during the first rainy season, after the driest months of the year. Thus, this population seems to have continuous reproductive activity, with an apparent peak at the onset of the first rainy season of the year. There were differences in the microhabitat use between sexes, between adults and juveniles, and between non-reproductive and reproductive females. Males use a wider variety of substrates at higher perches, while females were mainly found on leaf litter and over leaves at low heights; however, ovigerous females mostly occupied substrates above 120 cm. Juveniles were less abundant than adults, and occupy low substrates, mostly at forest litter. Two selection models evaluated the preference for calling sites, related to physiological requirements of humidity and for vocal sound dispersion. Males preferred to vocalize on perches at heights among 41-120 cm and with a vegetal structure that maintains high humidity, avoiding desiccation, and reducing exposure to predators. Therefore, intrapopulation variation in microhabitat use in this species is related to age, sex, reproductive condition, and physiological requirements.
Scanning electron microscopy of acrothoracican cypris larvae (Crustacea, Thecostraca, Cirripedia, Acrothoracica, Lithoglyptidae)
Authors: Kolbasov Gregory A. , Høeg Jens T. , Elfimov Alexei S.
Published: July 2019

Scanning electron microscopy was used to provide a full morphological description of cypris morphologyin the acrothoracican species Lithoglyptes milis and L. habei (Lithoglyptidae).Special attention was givento lattice organs, antennules, thorax, thoracopods, abdomen, and furcal rami. Cypris larvae of the Acrothoracica share some putative plesiomorphic features with the cypris-like ascothoracid larvae of the non-cirripede taxon Ascothoracida. The most notable are traces of abdominal segmentation and carapace lattice organs without pore fields. Acrothoracican cyprids also share numerous synapomorphies with those of the Thoracica and the Rhizocephala. This list includes a four-segmented antennule with a triangular first segment of two sclerites set at an angle to each other, a cylindrical second segment, a small third segment functioning asan attachment organ, and a cylindrical fourth segment bearinghomologous sensory setae. Further apomorphies are a pair of frontolateral horn glands exiting anteroventrally on the headshield (carapace), a pair of multicellular cement glands exiting on the attachment organs, a single stout, serrated and non-natatory seta on the thoracopodal exopods and a highly reduced abdomen with at best traces of segmentation. These synapomorphies in cypris morphology supporta monophyletic taxon Cirripedia comprising the Acrothoracica, Thoracica, and Rhizocephala but excluding the Ascothoracida.
Consequences of the discovery of Stenasellus (Crustacea, Isopoda, Asellota) 2 in the underground waters of Oman (Arabian Peninsula)
Authors: Magniez Guy J. , Stock Jan H.
Published: July 2019

An overview of the present knowledgeof the family Stenasellidae (Asellota: Aselloidea) is presented, focusing on the success of recent investigations of the underground waters of Oman (S.E. Arabian Peninsula). We take up the discovery of four new species of the genus Stenasellus: small species adapted to interstitial biotopes and larger ones typical of karstic aquifers. These species cohabit in ecotones between interstitial and karstic water systems. The putative presence of stenasellids in hypogean waters of Yemen and South Iran is suggested. The taxonomic status of the genus Stenasellus auct. needs to be reconsidered in the future. A scenario to explain the origin and the presence of these isopods in continental underground waters is advanced.
Geographic variation and taxonomy of crested newts (Triturus cristatus superspecies): morphological and mitochondrial DNA data
Authors: Arntzen J.W. , Wallis Graham P.
Published: July 2019

Within the newt genus Triturus, the large-bodied species in the T. cristatus (crested newt) superspecies show an unusual degree of variation in relative trunk length as a result of among-taxon variation in interlimb vertebral count. Here we examine the systematic value of this feature as assessed by both exterior measurement (Wolterstorff Index) and direct radiographic count of rib-bearing vertebrae, with particular reference to a number of confounding factors (sex differences, hybridisation, geographic variation, allometry, preservation effects). Using our mtDNA haplotype data, which are largely concordant with geographic distribution of species, we find that direct count ofthe rib-bearing vertebrae performs more reliably (14% misclassification) than external measurement (31% misclassification) as a species identifier. We therefore recommend this feature as a taxonomic tool, although (like external measurement) it breaks down near hybrid zones. To account for the observed biogeographicalpattern and phenotype-genotype discrepancies, a scenario is presented that combines the movement of the contact zone between taxa with asymmetric hybridisation. This scenario applies to species interactions in eastern Yugoslavia and western France.
Pyrgoma kuri Hoek, 1913: a case study in morphology and systematics of a symbiotic coral barnacle (Cirripedia: Balanomorpha)
Authors: Ross Arnold , Newman William A.
Published: July 2019

The systematics of pyrgomatids, stemming from the early 1800’s, has traditionally been based on the number of plates making up the wall (six, four or one) and specializations in the opercular plates. A recent study ofthe related bryozobiines focused attention on detailed structural modifications of the basis, which we now find also applies to some highly derived pyrgomatids and an archaeobalanine. Reexamination of the Indonesian coral barnacle Pyrgoma kuri Hoek, 1913 has revealed previously unknown morphological features, including separable opercular plates, a true tergal spur, and a basis lined with ladder to arch-like calcareous structures covering “atrial passageways”. Thus, the present study expands our knowledge of such specializations and our understanding of the evolution and relationships of the derived pyrgomatids as well as the archaeobalanines and bryozobiines. The complex modifications of the basis found in these three groups evidently function as an avenuefor chemical mediationof growth between the barnacle and its host. Although monophyly of the archaeobalanines and bryozobiines based on such structures is possible, there is no obvious connection between them and the few derived pyrgomatids in which these features occur. There is apparently a propensity toward such modifications in archaeobalanids resulting in parallel evolution in association with distinctly different hosts (e.g., sponges, corals and bryozoans).
A Storthyngura (Crustacea, Isopoda) from the Bellingshausen Sea, Antarctica
Authors: Brandt Angelika
Published: July 2019

During the expedition ANT XI/3 with RV Polarstern 17 multiple corers were taken in the Bellingshausen Sea. From this material only a single, immature isopod was sorted. This specimen is a manca II of a presumably new species of the genus Storthyngura. However, as it is immature and only a single specimen was sampled, more material of this species will have to be collected prior to the description of a new species.
Scarab beetles at the interface of wheel invention in nature and culture?
Authors: Scholtz Gerhard
Published: July 2019

In this review some examples of rolling behaviour in nature are described and discussed in terms of the realised degree of wheel-like locomotion. The combination of rotation and the use of the low friction resistance of circular and smooth surfaces to transport a heavy load, as is seen in scarab beetles rolling dung pills, is the closest degree of similarity to a wheel found in nature. Populations of dung rolling scarabs may have benefited from the early domestication of large mammals in the Middle East. I suggest that an increased opportunity to observe pill rolling scarab beetles has inspired humans to invent the wheel.
Revision of the stick insect genus Leptynia: description of new taxa, speciation mechanism and phylogeography
Authors: Scali Valerio , Milani Liliana , Passamonti Marco
Published: July 2019

Leptynia specimens were analyzed by karyotype analysis, mitochondrial gene sequencing and SEM of bodies and eggs. Here we describe a new species, Leptynia annaepaulae, and three subspecies of L. attenuata Pantel (L. attenuata attenuata, L. attenuata iberica, L. attenuata algarvica). The phylogeny of the genus Leptynia is congruent with a karyotype trend toward a reduction of chromosome number and the shift from the shared XX/X0 sex chromosome formula to the unusual XX/XY one. Chromosome repatterning appears to occur ahead of genetic differentiation, following a chromosome model of cladogenesis. Chromosome and genetic differentiation, in turn, appears to precede morphological distinction, thus realizing a condition of incipient species for most of the Leptynia taxa. Actually, morphological analyses revealed that, only rarely clear cut differences exist among and between taxa, while, more often, just trends in the differentiating traits occur, since the investigated characters generally suffer from some overlapping: In this study, only the 10th:9th ratio value and the subanal vomer appear to be diagnostic for L. annaepaulae against all other Leptynia taxa. As a consequence, the subanal vomer as well as cercus tooth features with egg chorion traits are not sharply diagnostic for the remaining co-generic taxa; however, comparisons are quite helpful in reducing uncertainties. A likely phylogeographic scenario for the genus supports that Leptynia ancestors spread from Northern Africa into Southern Spain where an ancestral taxon originated L. annaepaulae (2n = 40/39, XX/X0, with 2 large dibrachial pairs). Later on, a northbound colonization, should have originated L. caprai (2n = 40/39, XX/X0, all acrocentrics), from which L. montana (2n = 38, XX/X0) and L. attenuata (2n = 36, XY/XX) originated; supporting instances of chromosome repatterning have been actually observed. In this connection we like to stress that, particularly in stick insects, androgenesis has been a preferential pathway to quickly make homozygous those odd chromosome rearrangements likely responsible for low fitness in the heterozygotes.
The phylogenetic position of the solitary zoanthid genus Sphenopus (Cnidaria: Hexacorallia)
Authors: Reimer James D. , Lin Meifang , Fujii Takuma , Lane David J.W. , Hoeksema Bert W.
Published: July 2019

The zoanthid genus Sphenopus (Cnidaria: Anthozoa: Zoantharia), like many other brachycnemic zoanthids, is found in shallow subtropical and tropical waters, but is uniquely unitary (solitary, monostomatous), azooxanthellate, and free-living. With sparse knowledge of its phylogenetic position, this study examines the phylogenetic position of Sphenopus within the family Sphenopidae utilizing specimens from southern Taiwan and Brunei collected in 1999-2011, and furthermore analyzes the evolution of its unique character set via ancestral state reconstruction analyses. Phylogenetic analyses surprisingly show Sphenopus to be phylogenetically positioned within the genus Palythoa, which is colonial (polystomatous), zooxanthellate, and attached to solid substrate. Ancestral state reconstruction strongly indicates that the unique characters of Sphenopus have evolved recently within Palythoa and only in the Sphenopuslineage. These results indicate that zoanthid body plans can evolve with rapidity, as in some other marine invertebrates, and that the traditional definitions of zoanthid genera may need reexamination.
Biodiversity of shallow-water sponges (Porifera) in Singapore and description of a new species of Forcepia (Poecilosclerida: Coelosphaeridae
Authors: Lim Swee-Cheng , de Voogd Nicole J. , Tan Koh-Siang
Published: July 2019

A surprisingly high number of shallow water sponge species (197) were recorded from extensive sampling of natural intertidal and subtidal habitats in Singapore (Southeast Asia) from May 2003 to June 2010. This is in spite of a highly modified coastline that encompasses one of the world’s largest container ports as well as extensive oil refining and bunkering industries. A total of 99 intertidal species was recorded in this study. Of these, 53 species were recorded exclusively from the intertidal zone and only 45 species were found on both intertidal and subtidal habitats, suggesting that tropical intertidal and subtidal sponge assemblages are different and distinct. Furthermore, only a third of the fouling species of sponges from a previous study was recorded in this study, thus suggesting that sponge assemblages from natural and fouling communities in the tropics are different as well. A new species, Forcepia (Forcepia) vansoesti is described from Singapore. Members of this genus possess unique spicules shaped in the form of a pair of forceps. The new species is distinguished from its congeners in having the largest forceps (nearly 300 μm in length) so far recorded in the Indo-Pacific.
Phylogenetic position and taxonomy of Cycloseris explanulata and C. wellsi (Scleractinia: Fungiidae): lost mushroom corals find their way home
Authors: Benzoni Francesca , Arrigoni Roberto , Stefani Fabrizio , Reijnen Bastian T. , Montano Simone , Hoeksema Bert W.
Published: July 2019

The scleractinian species Psammocora explanulata and Coscinaraea wellsi were originally classified in the family Siderastreidae, but in a recent morpho-molecular study it appeared that they are more closely related to each other and to the Fungiidae than to any siderastreid taxon. A subsequent morpho-molecular study of the Fungiidae provided new insights regarding the phylogenetic relationships within that family. In the present study existing molecular data sets of both families were analyzed jointly with those of new specimens and sequences of P. explanulata and C. wellsi. The results indicate that both species actually belong to the Cycloseris clade within the family Fungiidae. A reappraisal of their morphologic characters based on museum specimens and recently collected material substantiate the molecular results. Consequently, they are renamed Cycloseris explanulata and C. wellsi. They are polystomatous and encrusting like C. mokai, another species recently added to the genus, whereas all Cycloseris species were initially thought to be monostomatous and free-living. In the light of the new findings, the taxonomy and distribution data of C. explanulata and C. wellsi have been updated and revised. Finally, the ecological implications of the evolutionary history of the three encrusting polystomatous Cycloseris species and their free-living monostomatous congeners are discussed.
DNA phylogeny of Ryukyus Leucothoidae (Crustacea: Amphipoda)
Authors: White Kristine N. , Reimer James D.
Published: July 2019

Commensal leucothoid amphipods collected from sponges, ascidians, and coral rubble from the Ryukyu Archipelago, Japan, were investigated using nuclear 18S ribosomal DNA sequences. Analysis of sequences from 21 species in three genera supported the current morphological species designations and the separation of the family into two clades. Additionally, a possible new generic-level clade was identified and the separation of the genera Anamixis and Paranamixis was not supported. Our results demonstrate that host specificity appears to evolve rapidly in sibling species in this family.
Contrasting responses of two xerophilous land snails to fire and natural reforestation
Authors: Santos Xavier , Bros Vicenç , Ros Elisabet
Published: July 2019

Land-use change is considered the main disturbance in landscape structure and composition, directly affecting faunal distribution and species richness worldwide. Wildfires and natural reforestation alter habitat structure in terms of vegetation cover and also in soil composition and moisture; these processes hence trigger habitat transformations that act as opposing forces at small spatial scales. We have explored the contrasting effects of wildfires and natural reforestation on two land-snail species of the genus Xerocrassa, which are endemic in the western Mediterranean. Snails were sampled in pine and Holm oak forest, stony bare slopes and burnt sites. Both species followed a similar pattern: they were present in more than 75% of the stony bare slope sites and around 50% of the burnt sites, but were almost absent in Holm oak forests. The comparison of aerial photographs from 1956 and 2003 showed that stony bare slopes were significantly larger in 1956, this indicating that the natural reforestation might close these habitats, and consequently threaten the viability of the Xerocrassa populations. Given their limited mobility, the presence of Xerocrassa at burnt sites suggests that these species live in small and cryptic populations within the forest, surviving fire and expanding their distribution due to the appearance of adequate habitats. Our study shows that natural reforestation and fire play opposing roles in conserving Xerocrassa populations. The preservation of stony bare slopes as well as other open areas is a key management guideline to maintain landscape mosaics and help future conservation of species of open habitats such as these vulnerable endemic gastropods.