Neurology in California
3657 results found
Search for local businesses, places and services near you
- United States
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- Ukraine
- United Kingdom
- Italy
- Poland
- Australia
- Spain
- New Zealand
- France
- Germany
- Ireland
Mammoth Physical Therapy Inc.
Mammoth Physical Therapy Inc. is a leading health institution located at 645 Old Mammoth Road in Mammoth Lakes, California, United States. Our dedicated team of experienced therapists provides top-quality physical therapy services to help patients recover from injuries, manage chronic conditions, and improve overall physical well-being. With a focus on personalized care and evidence-based treatments, we strive to help our patients achieve their health and wellness goals. Visit Mammoth Physical Therapy Inc. today and take the first step towards a healthier, more active lifestyle.
Holistic Women's Wellness
Welcome to Holistic Women's Wellness, your sanctuary for comprehensive health and rejuvenation located at 5905 Soquel Drive, Soquel, California. We are a unique gym and health center dedicated to empowering women through expert therapeutic massage and luxurious pampering experiences. Our mission is to address and alleviate chronic pain, injury, neurological and physical disorders, postsurgical recovery, and stress management. Founded by Shannon Innis, a seasoned Massage Therapist and Pre/Postnatal Yoga Instructor with 25 years of experience, Holistic Women's Wellness offers a compassionate approach to women's health. Shannon is committed to supporting women who often fall through the cracks of the healthcare system, providing intentional and therapeutic care for every stage of a woman's life.
Rojeh Melikian, MD - Spine Surgeon
Welcome to the practice of Dr. Rojeh Melikian, MD, a renowned spine surgeon dedicated to providing exceptional care and advanced treatment options for spinal conditions. Conveniently located at 4551 Glencoe Avenue in Marina del Rey, California, our practice is committed to enhancing the quality of life of our patients through personalized and compassionate healthcare services. Dr. Melikian is a highly skilled and experienced spine surgeon, specializing in the diagnosis and treatment of a wide range of spinal disorders, including degenerative disc disease, spinal stenosis, herniated discs, and scoliosis. Utilizing state-of-the-art technology and the latest surgical techniques, Dr. Melikian strives to deliver optimal outcomes and improve overall patient wellness.
Back In Action Bodyworks
Welcome to Back In Action Bodyworks, your trusted chiropractic source located at 25200 Crenshaw Boulevard, Torrance, California. Situated in the heart of the South Bay, we are dedicated to helping you achieve your wellness goals through expert chiropractic care. Led by Dr. Rodney Ruge, our practice offers gentle and effective treatments for a variety of conditions including neck pain, back pain, headaches, disc problems, and auto injuries. Our approach combines skill and expertise to bring you better health and a better way of life. Whether you're dealing with painful overuse injuries, poor posture, joint pain, or the aftermath of a fall, our chiropractic treatments can offer natural relief and improved mobility. We also provide specialized care for neurological conditions and athletic setbacks, helping you succeed and heal faster.
Sleep and Brain
Sleep and Brain is a leading medical institution located at 14567 Big Basin Way in Saratoga, California. Our team of expert doctors specializes in diagnosing and treating sleep disorders and brain-related conditions. We offer cutting-edge technology and personalized treatment plans to help our patients achieve optimal health and well-being. Whether you are struggling with insomnia, sleep apnea, or other neurological issues, Sleep and Brain is dedicated to providing top-quality care and support. Visit us today to take the first step towards a better night's sleep and a healthier brain.
Koda Physical Therapy
Koda Physical Therapy is a leading health institution located at 1600 Corporate Circle in Petaluma, California, United States. Our team of highly skilled and experienced therapists are dedicated to providing personalized care and treatment to help our patients achieve their physical therapy goals. Whether you are recovering from an injury, managing a chronic condition, or looking to improve your overall wellness, Koda Physical Therapy is here to support you every step of the way. Our state-of-the-art facility and cutting-edge techniques ensure that you receive the highest quality care in a comfortable and welcoming environment. Contact us today to schedule an appointment and start your journey towards better health and mobility with Koda Physical Therapy.
Select Physical Therapy - Rohnert Park
Select Physical Therapy in Rohnert Park is a leading healthcare institution located at 1331 Medical Center Drive in California, United States. Our team of experienced doctors and health professionals are dedicated to providing top-quality physical therapy services to help patients recover from injuries, manage chronic conditions, and improve overall wellness. With a focus on personalized care and evidence-based treatments, we strive to help our patients achieve their health and wellness goals. Visit us at Select Physical Therapy in Rohnert Park for compassionate and effective care.
St Francis Multi Specialty Med Group
St. Francis Multi Specialty Med Group is a leading healthcare institution located at 3628 East Imperial Highway in Lynwood, California. Our team of experienced and dedicated healthcare professionals offer a wide range of medical services to meet the diverse needs of our patients. From primary care to specialty services, we are committed to providing high-quality, compassionate care to all who walk through our doors. Visit us today and experience the difference at St. Francis Multi Specialty Med Group.
MemorialCare Medical Group - San Clemente
MemorialCare Medical Group - San Clemente is a top-notch healthcare institution located at 638 Camino De Los Mares in San Clemente, California. This facility offers a wide range of services including Internal Medicine and Neurology, provided by a team of highly qualified and renowned specialists. Whether you are in need of primary care, urgent care, or specialized services, MemorialCare has you covered. With a focus on quality care and convenience, MemorialCare Medical Group - San Clemente is dedicated to keeping you and your family healthy. Their team of physicians, nurses, therapists, and support staff work together to provide personalized care tailored to your specific needs.
Focus Physical Therapy
Focus Physical Therapy is a leading health institution specializing in physiotherapy services. Located at 30212 Tomas in Rancho Santa Margarita, California, our dedicated team of physiotherapists is committed to providing personalized care and effective treatments to help our patients achieve their health and wellness goals. Whether you are recovering from an injury, managing a chronic condition, or looking to improve your overall physical well-being, our experienced staff is here to support you every step of the way. Visit Focus Physical Therapy today and experience the difference that quality care can make in your life.
Leucadia Chiropractic Wellness Clinic
Leucadia Chiropractic Wellness Clinic is a premier health institution located at 1351 Encinitas Boulevard in Encinitas, California. As a trusted chiropractic clinic, we specialize in providing expert care and treatment to help our patients achieve optimal wellness and overall health. Our team of experienced doctors is dedicated to delivering personalized and compassionate care to address a wide range of health concerns, from back pain and headaches to sports injuries and chronic conditions. Visit us at Leucadia Chiropractic Wellness Clinic and start your journey towards a healthier, happier you.
Quantum Functional Medicine: Juergen Winkler, MD, ABIHM, ABOIM
Quantum Functional Medicine, led by Dr. Juergen Winkler, MD, ABIHM, ABOIM, is a cutting-edge healthcare institution located at 5814 Van Allen Way in Carlsbad, California. Dr. Winkler specializes in functional medicine, which focuses on addressing the root cause of health issues rather than just treating symptoms. He is board-certified in Integrative and Holistic Medicine, as well as in Internal Medicine. Patients can expect personalized treatment plans that incorporate a holistic approach to health and wellness. Quantum Functional Medicine offers a wide range of services to help patients achieve optimal health and well-being.
Ventura Neurosurgery
Ventura Neurosurgery is a leading medical institution located at 168 North Brent Street in Ventura, California. Our team of highly skilled neurosurgeons is dedicated to providing top-notch care for patients with neurological conditions. From brain tumors to spinal cord injuries, we offer cutting-edge treatments and surgical procedures to help improve the quality of life for our patients. Trust Ventura Neurosurgery for expert care and compassionate service in the field of neurosurgery.
Two Trees Ortho-Ortho Satellite Branch
Two Trees Ortho-Ortho Satellite Branch is a leading health institution located at 5725 Ralston Street in Ventura, California, United States. Specializing in orthopedic therapy, our satellite branch offers individualized physical therapy in a warm and encouraging environment. With over 15 years of experience, our clinic serves Ventura, Oxnard, and surrounding communities, providing exceptional care and trusted expertise. Our team of friendly and skilled staff at Two Trees Ortho-Ortho Satellite Branch is dedicated to helping you reach your goals and reduce the chance of future injuries. We offer a personalized treatment plan tailored to your specific needs, using comprehensive methods such as functional movement analysis and a whole-body approach.
Two Trees Physical Therapy
Two Trees Physical Therapy is a leading institution located at 177 North Reino Road in Thousand Oaks, California, dedicated to providing high-quality physical therapy services to the community of Newbury Park and beyond. With over 15 years of experience, our team of expert clinicians offers personalized treatment plans to help individuals achieve their goals and reduce the risk of future injuries. Specializing in a wide range of conditions including balance and vertigo issues, sports injuries, and workers compensation cases, Two Trees Physical Therapy is committed to delivering exceptional care and remarkable outcomes through in-clinic PT treatment. Our comprehensive approach, which includes functional movement analysis and differential diagnosis, ensures that each patient receives the most effective services tailored to their specific needs.
Atlantis Physical and Occupational Therapy
Atlantis Physical and Occupational Therapy, located at 2601 Airport Drive in Torrance, California, is a leading health institution in the South Bay area. Our experienced staff combines evidence-based science with clinical expertise to provide the best possible care for our patients. Since 1981, we have been helping local residents recover from a variety of orthopedic and neurological issues, with the goal of returning them to their normal activities. Our new and bigger location at Rolling Hills Plaza offers plenty of parking and easy access. We value patient feedback and strive to exceed expectations in order to achieve the best results. Our patients often feel like family, and we are dedicated to creating a positive and successful therapeutic environment for everyone. We serve the communities of Torrance, Carson, El Segundo, Gardena, Hawthorne, Hermosa Beach, Inglewood, Lomita, Manhattan Beach, Palos Verdes, Redondo Beach, Rolling Hills, and San Pedro. Contact us at (310) 325-7404 or visit our website to learn more about our services and specialties. Welcome to Atlantis Physical and Occupational Therapy, where your health and well-being are our top priorities.
MDR Specialty Pharmacy
MDR Specialty Pharmacy is a leading health institution located at 10921 Wilshire Boulevard in Los Angeles, California. As a specialty pharmacy, they offer a wide range of pharmaceutical products and services tailored to meet the unique needs of patients with complex medical conditions. Their knowledgeable staff is dedicated to providing personalized care and support to help individuals manage their health effectively. With a focus on quality and innovation, MDR Specialty Pharmacy is a trusted destination for all your pharmacy needs. Visit their store today to experience top-notch service and expertise in healthcare.
Neurosurgical Medical Clinic, Inc.
Neurosurgical Medical Clinic, Inc. is a leading institution located at 3750 Convoy Street in San Diego, California, United States. Our team of experienced neurosurgeons, physician assistants, and nurse practitioners have over 20 years of experience in providing top-quality care for surgical disorders of the brain, spine, and peripheral nerves. We work closely with hospitals throughout San Diego County to ensure our patients receive the best possible treatment. Founded by Dr. Sam Assam in 1968, Neurosurgical Medical Clinic, Inc. has deep roots in the San Diego community. Our surgeons are highly skilled and dedicated to providing individualized care using the most advanced techniques available. We are committed to excellence and strive to offer the highest quality of care for our patients and their families.
Peltz and Associates Physical Therapy Inc
Peltz and Associates Physical Therapy Inc is a leading physiotherapy institution located at 140 Wikiup Drive, Santa Rosa, California, United States. Our team of highly skilled and experienced physiotherapists is dedicated to providing personalized care and treatment to help our patients recover from injuries, manage chronic pain, and improve their overall physical well-being. With a focus on evidence-based practices and innovative treatment techniques, we strive to help our patients achieve their health and wellness goals. Visit us today to experience the difference that quality physiotherapy care can make in your life.
California Cranial Institute - Thomas Bloink DC
California Cranial Institute - Thomas Bloink DC is a leading health institution located in Los Gatos, California. Specializing in cranial care, Dr. Thomas Bloink and his team offer cutting-edge treatments and therapies to help patients achieve optimal health and wellness. With a focus on holistic and natural healing methods, the institute provides personalized care to address a wide range of health concerns. Whether you are seeking relief from chronic pain, neurological issues, or simply looking to improve your overall well-being, the California Cranial Institute is dedicated to helping you feel your best. Visit us at 431 Monterey Avenue to experience the difference in your health today.
Link Neuroscience Institute
The Link Neuroscience Institute is a cutting-edge medical facility located at 1700 North Rose Avenue in Oxnard, California, United States. Specializing in the field of neuroscience, our team of expert doctors and health professionals are dedicated to providing top-quality care and treatment for patients with neurological disorders and conditions. With state-of-the-art technology and innovative approaches, we strive to offer personalized and comprehensive care to improve the lives of our patients. Visit us at the Link Neuroscience Institute for compassionate and skilled medical services in the field of neuroscience.
La Jolla Institute for Immunology (LJI)
Located in San Diego, California, the La Jolla Institute for Immunology (LJI) is a leading research institution dedicated to unraveling the complexities of the immune system. Led by President and CEO Erica Ollmann Saphire, Ph.D., MBA, LJI researchers are at the forefront of infectious disease research, tackling a wide range of health threats including asthma, cancer, CoVID-19, type 1 diabetes, Parkinson's, and more. Through groundbreaking discoveries, LJI is moving the world closer to a future of Life Without Disease. With a focus on personalized treatments, novel immune-based cancer therapies, vaccine research, and understanding sex-specific immune responses, LJI scientists are making significant strides in the field of immunology. The institute's Coronavirus Taskforce is actively responding to the ongoing crisis and preparing for future emerging diseases.
Sanford Burnham Prebys Medical Discovery Institute
Sanford Burnham Prebys Medical Discovery Institute is a renowned biomedical research institution located in San Diego, California. With a focus on cutting-edge medical research and discovery, the institute is dedicated to advancing the field of biomedicine and improving human health. Located at 10901 North Torrey Pines Road, the institute is at the forefront of groundbreaking research in areas such as cancer, neurodegenerative diseases, and metabolic disorders. Collaborating with leading scientists and healthcare professionals, Sanford Burnham Prebys Medical Discovery Institute is committed to making significant contributions to the field of medicine and improving the lives of people worldwide.
Mojan Gabbay, MD
Mojan Gabbay, MD is a reputable healthcare institution located at 12555 West Jefferson Boulevard in Los Angeles, California. Dr. Mojan Gabbay is a skilled and experienced doctor who specializes in providing top-quality healthcare services to patients. The institution offers a wide range of medical services, including preventive care, diagnosis, treatment, and management of various health conditions. Patients can expect compassionate care and personalized treatment plans tailored to their individual needs. Dr. Gabbay and her team are dedicated to promoting health and well-being in the community.
Physical Therapy & Wellness
Physical Therapy & Wellness is a leading health institution located at 2490 South Main Street in Red Bluff, California, United States. Our dedicated team of physiotherapists is committed to providing top-quality care and personalized treatment plans to help our patients achieve optimal physical health and wellness. Whether you are recovering from an injury, managing a chronic condition, or simply looking to improve your overall well-being, our experienced professionals are here to support you every step of the way. With a focus on evidence-based practices and compassionate care, Physical Therapy & Wellness is your trusted partner in achieving a healthier, more active lifestyle.
Peak Performance Physical Therapy
Peak Performance Physical Therapy is a leading health institution located at 1895 Mowry Avenue in Fremont, California. Our team of highly skilled physiotherapists is dedicated to helping our patients achieve their peak physical performance and overall well-being. With personalized treatment plans and state-of-the-art equipment, we offer a wide range of services to address various musculoskeletal and neurological conditions. Whether you are recovering from an injury, managing a chronic condition, or simply looking to improve your mobility and strength, Peak Performance Physical Therapy is here to support you on your journey to optimal health.
SpeakABLE Speech Therapy Services
SpeakABLE Speech Therapy Services is a leading speech therapy institution located at 39675 Cedar Boulevard in Newark, California, United States. We specialize in providing high-quality speech therapy services to individuals of all ages who may be facing communication challenges. Our team of experienced and dedicated speech therapists are committed to helping our clients improve their speech and language skills in a supportive and caring environment. Whether you or your loved one are struggling with speech delays, stuttering, voice disorders, or other communication difficulties, SpeakABLE Speech Therapy Services is here to help. Contact us today to learn more about how we can assist you on your journey to improved communication abilities.
Ascend Rehab Services
Ascend Rehab Services is a leading health institution located at 29516 Kohoutek Way in Union City, California, United States. Our dedicated team of healthcare professionals is committed to providing top-quality rehabilitation services to help individuals recover and regain their strength and independence. With a focus on personalized care and evidence-based treatment methods, we strive to help our patients ascend to their highest potential. Whether you are recovering from an injury, surgery, or illness, Ascend Rehab Services is here to support you on your journey to wellness.
Moscardi Physical Therapy
Moscardi Physical Therapy is a health institution located at 911 North Oak Park Boulevard in Pismo Beach, California, United States. Our focus is on providing personalized one-on-one patient care with a Physical Therapist during each visit. We offer individualized exercise programs tailored to each patient's injury, and once range of motion and tissue healing are achieved, we implement a comprehensive strength training program. Our facility has access to an 8000 square foot gym equipped with high-end cardiovascular and strength training equipment. Established in 2004, Moscardi Physical Therapy specializes in outpatient physical therapy on the central coast. We are experts in the rehabilitation process for various musculoskeletal disorders, both pre and post-surgery. In addition to physical therapy, we offer gym programs for strength and conditioning, balance training for neuromuscular disorders, and home health services for gait and transfer training.
Two Trees Physical Therapy
Two Trees Physical Therapy, located at 2051 Statham Boulevard in Oxnard, California, is a premier health institution specializing in physical therapy services. With over 15 years of experience, Two Trees Physical Therapy has been serving the Oxnard and Ventura County communities with individualized care in a warm and encouraging environment. At Two Trees Physical Therapy, our team of expert therapists offer specialized treatments for Orthopedic, Neurologic, and Pediatric conditions. From balance and vertigo issues to sports injuries, concussions, and pediatric therapy, we provide exceptional care and trusted expertise to help patients achieve remarkable outcomes.
Nearby cities:
- Agoura Hills
- Alameda
- Albany
- Alhambra
- Aliso Viejo
- Anaheim
- Antioch
- Aptos
- Arcadia
- Arcata
- Arroyo Grande
- Artesia
- Atascadero
- Auburn
- Bakersfield
- Baldwin Park
- Banning
- Beaumont
- Bellflower
- Belmont
- Benicia
- Berkeley
- Beverly Hills
- Bishop
- Brea
- Brentwood
- Buena Park
- Burbank
- Burlingame
- Calabasas
- Camarillo
- Cambria
- Campbell
- Capitola
- Carlsbad
- Carmel-by-the-Sea
- Carmichael
- Carson
- Castro Valley
- Ceres
- Cerritos
- Chino
- Chino Hills
- Chula Vista
- Citrus Heights
- Clearlake
- Cloverdale
- Coalinga
- Colton
- Commerce
- Compton
- Concord
- Corona
- Coronado
- Corte Madera
- Costa Mesa
- Cotati
- Covina
- Crescent City
- Culver City
- Cupertino
- Cypress
- Daly City
- Dana Point
- Danville
- Davis
- Del Mar
- Diamond Bar
- Dixon
- Downey
- Dublin
- East Los Angeles
- El Cajon
- El Cerrito
- El Monte
- El Segundo
- Elk Grove
- Emeryville
- Encinitas
- Escondido
- Eureka
- Fair Oaks
- Fairfax
- Fairfield
- Fallbrook
- Folsom
- Fontana
- Fort Bragg
- Fortuna
- Foster City
- Fountain Valley
- Fremont
- Fullerton
- Garden Grove
- Gardena
- Gilroy
- Glendale
- Glendora
- Goleta
- Granite Bay
- Grover Beach
- Hacienda Heights
- Half Moon Bay
- Hawthorne
- Hayward
- Healdsburg
- Hemet
- Hermosa Beach
- Hollister
- Huntington Beach
- Huntington Park
- Inglewood
- Irvine
- Jurupa Valley
- Kentfield
- La Habra
- La Mesa
- La Mirada
- La Palma
- La Puente
- Ladera Ranch
- Lafayette
- Laguna Beach
- Laguna Hills
- Laguna Niguel
- Lake Forest
- Lakeport
- Lakewood
- Larkspur
- Lawndale
- Lemon Grove
- Lincoln
- Livermore
- Lodi
- Loma Linda
- Lomita
- Lompoc
- Long Beach
- Los Alamitos
- Los Altos
- Los Angeles
- Los Banos
- Los Gatos
- Lynwood
- Malibu
- Mammoth Lakes
- Manhattan Beach
- Marina
- Marina del Rey
- Martinez
- Maywood
- McKinleyville
- Menifee
- Menlo Park
- Mill Valley
- Milpitas
- Mission Viejo
- Modesto
- Montebello
- Monterey
- Monterey Park
- Moorpark
- Moraga
- Moreno Valley
- Morgan Hill
- Morro Bay
- Mountain View
- Murrieta
- Napa
- National City
- Newark
- Newport Beach
- Nipomo
- Norwalk
- Novato
- Oakland
- Oceanside
- Ontario
- Orange
- Orangevale
- Orinda
- Oxnard
- Pacific Grove
- Pacifica
- Palo Alto
- Palos Verdes Estates
- Paramount
- Pasadena
- Paso Robles
- Patterson
- Perris
- Petaluma
- Pico Rivera
- Pismo Beach
- Pittsburg
- Placentia
- Pleasant Hill
- Pleasanton
- Pomona
- Port Hueneme
- Poway
- Ramona
- Rancho Cordova
- Rancho Cucamonga
- Rancho Palos Verdes
- Rancho Santa Fe
- Rancho Santa Margarita
- Red Bluff
- Redding
- Redlands
- Redondo Beach
- Redwood City
- Richmond
- Riverside
- Rocklin
- Rohnert Park
- Rolling Hills Estates
- Rosemead
- Roseville
- Rowland Heights
- Sacramento
- Salinas
- San Anselmo
- San Bernardino
- San Carlos
- San Clemente
- San Diego
- San Dimas
- San Francisco
- San Gabriel
- San Jacinto
- San Jose
- San Juan Capistrano
- San Leandro
- San Lorenzo
- San Luis Obispo
- San Marcos
- San Mateo
- San Pablo
- San Rafael
- San Ramon
- Santa Ana
- Santa Barbara
- Santa Clara
- Santa Clarita
- Santa Cruz
- Santa Fe Springs
- Santa Maria
- Santa Monica
- Santa Paula
- Santa Rosa
- Santa Ynez
- Santee
- Saratoga
- Sausalito
- Scotts Valley
- Seal Beach
- Sebastopol
- Signal Hill
- Simi Valley
- Solana Beach
- Solvang
- Sonoma
- Soquel
- South El Monte
- South Lake Tahoe
- South San Francisco
- Spring Valley
- St. Helena
- Stanford
- Stockton
- Sunnyvale
- Tahoe City
- Temecula
- Templeton
- Thousand Oaks
- Torrance
- Tracy
- Truckee
- Turlock
More Categories:
- Jewelry in California
- Flower Store & Florist in California
- Hospital in California
- Public Pools & Water Park in California
- Beauty Salon in California
- Vacation House Rentals in California
- Cleaning Services in California
- Cafe & Coffee Shop & Pub in California
- Pawnshops in California
- Building Materials in California
- School & Kindergarten in California
- Children's Entertainment in California
- Grocery Store in California
- Auto Parts in California
- Taxi & Freight Transport in California
- Pharmacy in California
- Household Appliances in California
- Clothing Store in California
- Travel Agency in California
- Hotel & Motel & Hostel in California
- Notary & Lawyer in California
- Furniture in California
- Dentistry in California
- Finance & Loans in California
- Manicure & Pedicure in California
- Sporting Goods in California
- Baby & Pregnancy Stores in California
- Visa Support in California
- Pets in California
- Restaurant in California
- Car Service in California
- Audit & Consulting in California
- Pizza & Sushi in California
- Nightclub in California
- Handyman Services in California
- Theater & Cinema in California
List of local businesses, places and services in California
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos