Quantum theory of chemical reaction dynamics     

DC Clary 《Science (New York, N.Y.)》1998,279(5358):1879-1882

It is now possible to use rigorous quantum scattering theory to perform accurate calculations on the detailed state-to-state dynamics of chemical reactions in the gas phase. Calculations on simple reactions, such as H + D2 --> HD + D and F + H2 --> HF + H, compete with experiment in their accuracy. Recent advances in theory promise to extend such accurate predictions to more complicated reactions, such as OH + H2 --> H2O + H, and even to reactions of molecules on solid surfaces. New experimental techniques for probing reaction transition states, such as negative-ion photodetachment spectroscopy and pump-probe femtosecond spectroscopy, are stimulating the development of new theories.  相似文献   

Aspirin: its effect on platelet glycolysis and release of adenosine diphosphate     

Doery JC  Hirsh J  de Gruchy GC 《Science (New York, N.Y.)》1969,165(3888):65-67

Incubation of human platelets with aspirin inhibited glycolysis and produced a fall in the concentration of adenosine triphosphate. When platelets were exposed to collagen there was an increase in glycolysis and release of adenosine diphosphate. Prior incubation of the platelets with aspirin for 5 minutes did not totally suppress the increase in glycolysis after exposure to collagen but completely inhibited the collagen-induced reaction of the release of adenosine diphosphate. It is suggested that aspirin acts on human platelets by inhibiting both release of adenosine diphosphate and the transport of glucose across the platelet membrane.  相似文献   

Anthrax in cattle in southern Western Australia     

D. FORSHAW  ARB HIGGS  DC MOIR  TM ELLIS  IJ LINKS 《Australian veterinary journal》1996,74(5):391-393

  相似文献   

Prevalence and Identity of Translocating Bacteria in Healthy Dogs     

John Dahlinger  Stanley L. Marks  Dwight C. Hirsh 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1997,11(6):319-322

Bacterial translocation is characterized by the passage of intestinally derived bacteria across the intestinal mucosa to local or regional tissues. This phenomenon is believed to be important in the pathogenesis of gram-negative bacteremia and septicemia; however, the pathway or route of translocation remains unclear. To define the route of translocation better, mesenteric lymph nodes from 50 apparently healthy dogs undergoing elective ovariohysterectomies were cultured aerobically and anaerobically. The aims of this study were to determine the prevalence of bacterial translocation and to quantify and identify types of organisms found in mesenteric lymph nodes. Peripheral blood and portal blood samples were similarly cultured to rule out hematogenous organisms as a source of lymph node contamination. Bacteria were isolated from mesenteric lymph nodes of 26 dogs (52%). The number of bacteria varied from 50 to > 10⁵ organ-isms/g of tissue. Bacteria isolated included Staphylococcus intermedius (n = 3), coagulase-negative Staphylococcus (n = 2), nonhemolytic Streptococcus (n = 4), Bacillus species (n = 5), Escherichia coli (n = 6), Salmonella species (n = 3), Pseudomonas species (n = 2), Enterococcus species (n = 2), Clostridium sordelli (n = 1), Micrococcus species (n = 1), Lactobacillus species (n = 1), and Propionibacterium acnes (n = 1). One of 50 peripheral blood samples yielded an unidentified gram-positive coccus and a coagulase-negative Staphylococcus. No bacteria were isolated from portal blood samples of any dog. Further studies of this type on sick dogs are warranted before clinical recommendations can be made to culture mesenteric lymph nodes routinely.  相似文献   

A descriptive study of fowl cholera in California meat turkeys: August 1985-July 1986   总被引：3，自引：0，他引：3  

K P Snipes  T E Carpenter  D W Hird  R H McCapes  D C Hirsh 《Avian diseases》1987,31(4):792-799

One hundred sixty meat-turkey premises in California were monitored for outbreaks of fowl cholera from August 1985 through July 1986. Nearly 27 million turkeys in 720 flocks were at risk during the year. Fifty-three flocks of approximately 3 million turkeys on 34 different premises experienced confirmed fowl cholera outbreaks. The epidemic curve for the year indicated that the majority of outbreaks occurred in the late summer and fall, particularly in October. The incidence of outbreaks during this time was not significantly associated with seasonal variation in the size of the turkey population. The mean flock age at outbreak was 10.8 weeks, with a range of 5-18 weeks.  相似文献   

Nocardia asteroides infection in horses: a review   总被引：2，自引：0，他引：2  

E L Biberstein  S S Jang  D C Hirsh 《Journal of the American Veterinary Medical Association》1985,186(3):273-277

From 1965 to 1983, Nocardia asteroides infection was diagnosed in 16 horses at the Veterinary Medical Teaching Hospital, University of California, Davis. In 2 of the cases, the infection was traumatic in origin and local in extent; the horses recovered without relevant antimicrobial therapy. Fourteen horses had pulmonary or disseminated infections that ended fatally. All 14 had various degrees of immunosuppression. Of these, 8 were Arabian foals with combined immunodeficiency disease and 3 were aged horses with hyperadrenocorticism secondary to ACTH-secreting pituitary tumors. Of the other 3, one had lymphosarcoma, another, hepatic disease presumed to be of toxic origin, and the third, a mixed disseminated bacterial infection.  相似文献   

Pelvic Parameters, Growth Rate, Puberty, and their Interrelationships in Young Dairy Heifers     

AG Ramin  RCW Daniel  DC Fenwick  RG Verrall 《Reproduction in domestic animals》1995,30(3):117-123

  相似文献   

Serological diagnosis of botulism in dairy cattle   总被引：1，自引：0，他引：1  

DC MAIN  AR GREGORY 《Australian veterinary journal》1996,73(2):77-78

  相似文献   

Principles and Practice of Therapeutic Exercise for Horses     

Rebecca Paulekas  Kevin K. Haussler  DVM  DC  PhD 《Journal of Equine Veterinary Science》2009

Physical therapists are an integral component of the medical team in human health care. They are backed by a solid foundation of basic science and clinical research. Veterinarians have only recently begun to incorporate physical therapy into clinical practice, but without formal research that validates therapeutic interventions specific to equine patients. The purpose of this article is to present a series of therapeutic exercises adapted for horses based on knowledge and experience of human physical therapy, equine biomechanics, and the types of movement dysfunction commonly seen in the performance horse. Injuries, lameness and musculoskeletal pain syndromes, frequently encountered in equine practice, are disorders that may be successfully addressed with physical therapy. Incorporating standard therapeutic interventions based on clinical success in humans, basic science research, or expert opinion is possible with the understanding that these techniques will ultimately be accepted or refuted when their success or failure is formally documented. This review is designed to stimulate discussion and encourage research that will add to the knowledge base and lead to effective therapeutic protocols in the equine patient.  相似文献   

Erratum     

DC Elliott 《New Zealand veterinary journal》2013,61(4)

  相似文献