Financial analysis of diameter-limit cut stands in northern hardwoods     

John E. Wagner  Christopher A. Nowak  Lisa M. Casalmir 《Small-Scale Forestry》2003,2(3):357-376

Diameter-limit cutting of stands in the US northeast is a common practice often thought to give the landowner the highest financial returns. A landowner’s decision to diameter-limit cut or use some other harvesting option on a given stand involves examining mutually exclusive investments. Previous research that compared diameter-limit cutting to other harvesting options implicitly assumed these were independent investments. This paper develops analytical models to examine a variety of harvesting options for a single stand, including diameter-limit cutting, as mutually exclusive investments, and with stand and financial parameters defined by the landowner. These models are used to examine implications of changes in the financial parameters for harvesting options. It is found that no simple guidelines can be laid down for choice of harvesting options to maximise the net present value of stands with respect to diameter-limit cutting compared to other harvesting options. The empirical examples reveal that which harvesting option has the largest net present value depends on the parameters of the landowner’s stand and the financial parameters chosen by the landowner. The analysis illustrates the importance of understanding the interrelationships between the financial and stand parameters in determining whether a diameter-limit cut is in fact the best financial option for a landowner.  相似文献   

Comparison of echocardiographic measurements and cardiac biomarkers in healthy dogs eating nontraditional or traditional diets     

Eric J. Owens  Nicole L. LeBlanc  Lisa M. Freeman  Katherine F. Scollan 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(1):37-46

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Cancer detection in clinical practice and using blood-based liquid biopsy: A retrospective audit of over 350 dogs     

Andi Flory  Lisa McLennan  Betsy Peet  Marissa Kroll  Deirdre Stuart  Devon Brown  Kathy Stuebner  Brenda Phillips  Brenda L. Coomber  J. Paul Woods  Mairin Miller  Chelsea D. Tripp  Amber Wolf-Ringwall  Kristina M. Kruglyak  Angela L. McCleary-Wheeler  Ashley Phelps-Dunn  Lilian K. Wong  Chelsea D. Warren  Gina Brandstetter  Michelle C. Rosentel  Lauren R. DiMarzio  Allison L. O'Kell  Todd A. Cohen  Daniel S. Grosu  Jason Chibuk  Dana W. Y. Tsui  Ilya Chorny  Jill M. Rafalko 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(1):258-267

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Safety and accuracy of blind vs. ultrasound-guided dorsal retrobulbar nerve blocks in horses—A cadaveric study     

Katharina Thieme  Luis Mesquita  Simona Lieberth  Christian Dancker  Marcus Georg Doherr  Johanna Corinna Eule 《Veterinary ophthalmology》2023,26(2):135-144

Objective

There is limited knowledge regarding the safety and accuracy of ultrasound-guided retrobulbar nerve blocks in horses. The aim of this study was to compare these parameters between blind and ultrasound-guided injection techniques for the dorsal retrobulbar nerve block in horses.

Methods

Equine cadaver heads were used to inject the retrobulbar space with contrast medium (CM). Injections were performed either blindly based on anatomic landmarks (blind group, n = 44) or under ultrasonographic guidance (US-group, n = 44), equally divided between an experienced and unexperienced operator. Needle position and distribution of CM were assessed with computed tomography imaging and evaluated by a board-certified veterinary diagnostic imager blinded to the technique. Safety and accuracy of both techniques were compared.

Results

Ocular penetration was observed in two cases (n = 2/44) in the blind group but not in the US group (n = 0/44). No intrathecal, intraneural, or intravascular injections were seen in either group. Safety was significantly improved in the US group (p = .026). There was no statistically significant difference between the groups regarding the accuracy of the injection. Excellent accuracy was achieved more often with the ultrasound-guided technique (n = 11/22) than with the blind technique (n = 7/22) when performed by the unexperienced operator, but this difference was not statistically significant.

Conclusion

To prevent globe-threatening complications and improve the safety of the injection, we recommend using the ultrasound-guided injection technique for the dorsal retrobulbar nerve block.  相似文献   

Taenia coenurus in the orbit of a chinchilla     

Holmberg BJ  Hollingsworth SR  Osofsky A  Tell LA 《Veterinary ophthalmology》2007,10(1):53-59

A 4-year old, male intact, captive-bred chinchilla (Chinchilla lanigera) was presented due to progressive exophthalmos of the right eye over a 5-month period. Ophthalmic examination revealed exophthalmos with dorsal displacement of the right globe. Retropulsion was decreased and a fluctuant, subcutaneous mass could be palpated posterior and dorsal to the central aspect of the zygomatic bone. Transdermal ultrasonography revealed a fluid-filled mass consistent with a cyst located within the ventral right orbit. Computed tomography demonstrated dorsal displacement of the globe, lateral displacement of the zygomatic arch, and numerous mineral-dense foci within the lumen of the cyst. The cyst was removed en bloc by ventral transpalpebral orbitotomy. Histopathology revealed a single capsulated cyst with multiple invaginated protoscolices, characterized by a prominent scolex with refractile hooklets, suckers, and abundant calcareous corpuscles consistent with a Taenia coenurus. Exophthalmos resolved with surgical therapy and there was no evidence of recurrence or postoperative complications over a period of 2 years. To the authors' knowledge, this is the first reported case of an orbital cyst of parasitic origin in a chinchilla.  相似文献   

Evaluation of biological safety in vitro and immunogenicity in vivo of recombinant Escherichia coli Shiga toxoids as candidate vaccines in cattle     

Katharina Kerner  Philip S Bridger  Gabriele K?pf  Julia Fr?hlich  Stefanie Barth  Hermann Willems  Rolf Bauerfeind  Georg Baljer  Christian Menge 《Veterinary research》2015,46(1)

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Passive surveillance for ticks on horses in Saskatchewan     

Gili Schvartz  Tasha Epp  Hilary J. Burgess  Neil B. Chilton  James S. Armstrong  Katharina L. Lohmann 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(5):486-489

Passive surveillance of ticks on horses in Saskatchewan revealed that the horses were parasitized by 3 species, Dermacentor albipictus, D. andersoni, and D. variabilis. The nymphs and adults of D. albipictus occurred on horses earlier in the year than did adults of the 2 other species.  相似文献   

Clear distinction between Burkholderia mallei and Burkholderia pseudomallei using fluorescent motB primers     

Gernot Schmoock  Mandy Elschner  Lisa D Sprague 《Acta veterinaria Scandinavica》2015,57(1)

Background

A frame-shift mutation in the flagellum motor gene motB coding for the chemotaxis MotB protein of Burkholderia mallei has been utilized to design a conventional duplex PCR assay with fluorescent labelled primers.

Findings

Species specificity was tested with a panel of 13 Burkholderia type strains. A total of 41 B. mallei field strains, 36 B. pseudomallei field strains, and 1 B. thailandensis field strain from different geographic regions were tested and correctly identified. Testing of 55 non-Burkholderia bacterial species revealed 100% specificity of the assay. The minimum detection limit was 1 pg DNA or 160 GE for B. mallei and 130 GE for B. pseudomallei, respectively.

Conclusions

This assay enables the clear distinction between B. mallei and B. pseudomallei/B. thailandensis.

Electronic supplementary material

The online version of this article (doi:10.1186/s13028-015-0104-4) contains supplementary material, which is available to authorized users.  相似文献   

Cardiopulmonary effects of dexmedetomidine and ketamine infusions with either propofol infusion or isoflurane for anesthesia in horses          下载免费PDF全文

Tanya Duke‐Novakovski  Carolina Palacios‐Jimenez  Tara Wetzel  Lisa Rymes  Andres F Sanchez‐Teran 《Veterinary anaesthesia and analgesia》2015,42(1):39-49

ObjectiveTo examine the cardiopulmonary effects of two anesthetic protocols for dorsally recumbent horses undergoing carpal arthroscopy.Study designProspective, randomized, crossover study.AnimalsSix horses weighing 488.3 ± 29.1 kg.MethodsHorses were sedated with intravenous (IV) xylazine and pulmonary artery balloon and right atrial catheters inserted. More xylazine was administered prior to anesthetic induction with ketamine and propofol IV. Anesthesia was maintained for 60 minutes (or until surgery was complete) using either propofol IV infusion or isoflurane to effect. All horses were administered dexmedetomidine and ketamine infusions IV, and IV butorphanol. The endotracheal tube was attached to a large animal circle system and the lungs were ventilated with oxygen to maintain end-tidal CO₂ 40 ± 5 mmHg. Measurements of cardiac output, heart rate, pulmonary arterial and right atrial pressures, and body temperature were made under xylazine sedation. These, arterial and venous blood gas analyses were repeated 10, 30 and 60 minutes after induction. Systemic arterial blood pressures, expired and inspired gas concentrations were measured at 10, 20, 30, 40, 50 and 60 minutes after induction. Horses were recovered from anesthesia with IV romifidine. Times to extubation, sternal recumbency and standing were recorded. Data were analyzed using one and two-way anovas for repeated measures and paired t-tests. Significance was taken at p=0.05.ResultsPulmonary arterial and right atrial pressures, and body temperature decreased from pre-induction values in both groups. PaO₂ and arterial pH were lower in propofol-anesthetized horses compared to isoflurane-anesthetized horses. The lowest PaO₂ values (70–80 mmHg) occurred 10 minutes after induction in two propofol-anesthetized horses. Cardiac output decreased in isoflurane-anesthetized horses 10 minutes after induction. End-tidal isoflurane concentration ranged 0.5%–1.3%.Conclusion and clinical relevanceBoth anesthetic protocols were suitable for arthroscopy. Administration of oxygen and ability to ventilate lungs is necessary for propofol-based anesthesia.  相似文献   

A whole-plant chamber system for parallel gas exchange measurements of Arabidopsis and other herbaceous species     

Katharina?K?lling  Gavin?M.?George  Roland?Künzli  Patrick?Flütsch  Samuel?C.?ZeemanEmail author 《Plant methods》2015,11(1):48

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